Fix tarball

Remove downstream dependents of oracle jdks
Remove cgminer
2014-04-07 10:03:45 -04:00 · 2014-04-07 09:50:30 -04:00 · 2014-04-07 09:46:01 -04:00 · 2014-04-07 09:43:36 -04:00 · 2014-04-07 09:43:05 -04:00 · 2014-04-07 09:41:31 -04:00
25336 changed files with 272005 additions and 1906019 deletions
--- a/.editorconfig
+++ b/.editorconfig
@ -1,74 +0,0 @@
-# EditorConfig configuration for nixpkgs
-# https://EditorConfig.org
-
-# Top-most EditorConfig file
-root = true
-
-# Unix-style newlines with a newline ending every file, utf-8 charset
-[*]
-end_of_line = lf
-insert_final_newline = true
-trim_trailing_whitespace = true
-charset = utf-8
-
-# Ignore diffs/patches
-[*.{diff,patch}]
-end_of_line = unset
-insert_final_newline = unset
-trim_trailing_whitespace = unset
-
-# see https://nixos.org/nixpkgs/manual/#chap-conventions
-
-# Match json/lockfiles/markdown/nix/perl/python/ruby/shell/docbook files, set indent to spaces
-[*.{json,lock,md,nix,pl,pm,py,rb,sh,xml}]
-indent_style = space
-
-# Match docbook files, set indent width of one
-[*.xml]
-indent_size = 1
-
-# Match json/lockfiles/markdown/nix/ruby files, set indent width of two
-[*.{json,lock,md,nix,rb}]
-indent_size = 2
-
-# Match perl/python/shell scripts, set indent width of four
-[*.{pl,pm,py,sh}]
-indent_size = 4
-
-# Match gemfiles, set indent to spaces with width of two
-[Gemfile]
-indent_size = 2
-indent_style = space
-
-# Disable file types or individual files
-# some of these files may be auto-generated and/or require significant changes
-
-[*.lock]
-indent_size = unset
-
-[gemset.nix]
-insert_final_newline = unset
-
-[pkgs/applications/editors/emacs-modes/recipes-archive-melpa.json]
-indent_size = unset
-
-[pkgs/development/lisp-modules/quicklisp-to-nix.nix]
-indent_size = unset
-
-[pkgs/development/haskell-modules/hackage-packages.nix]
-indent_style = unset
-indent_size = unset
-trim_trailing_whitespace = unset
-
-[pkgs/development/mobile/androidenv/generated/{addons,packages}.nix]
-trim_trailing_whitespace = unset
-
-[pkgs/development/node-packages/node-packages.nix]
-insert_final_newline = unset
-
-[pkgs/servers/dict/wordnet_structures.py]
-indent_size = unset
-trim_trailing_whitespace = unset
-
-[pkgs/top-level/perl-packages.nix]
-indent_size = unset
--- a/.gitattributes
+++ b/.gitattributes
@ -1,16 +0,0 @@
-**/deps.nix linguist-generated
-**/node-packages.nix linguist-generated
-
-pkgs/applications/editors/emacs-modes/*-generated.nix linguist-generated
-pkgs/development/r-modules/*-packages.nix linguist-generated
-pkgs/development/haskell-modules/hackage-packages.nix linguist-generated
-pkgs/development/beam-modules/hex-packages.nix linguist-generated
-
-doc/** linguist-documentation
-doc/default.nix linguist-documentation=false
-
-nixos/doc/** linguist-documentation
-nixos/doc/default.nix linguist-documentation=false
-
-nixos/modules/module-list.nix merge=union
-# pkgs/top-level/all-packages.nix merge=union
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@ -1,195 +0,0 @@
-# CODEOWNERS file
-#
-# This file is used to describe who owns what in this repository. This file does not
-# replace `meta.maintainers` but is instead used for other things than derivations
-# and modules, like documentation, package sets, and other assets.
-#
-# For documentation on this file, see https://help.github.com/articles/about-codeowners/
-# Mentioned users will get code review requests.
-
-# This file
-/.github/CODEOWNERS @edolstra
-
-# Libraries
-/lib                        @edolstra @nbp @infinisil
-/lib/systems                @nbp @ericson2314 @matthewbauer
-/lib/generators.nix         @edolstra @nbp @Profpatsch
-/lib/cli.nix                @edolstra @nbp @Profpatsch
-/lib/debug.nix              @edolstra @nbp @Profpatsch
-/lib/asserts.nix            @edolstra @nbp @Profpatsch
-
-# Nixpkgs Internals
-/default.nix                          @nbp
-/pkgs/top-level/default.nix           @nbp @Ericson2314
-/pkgs/top-level/impure.nix            @nbp @Ericson2314
-/pkgs/top-level/stage.nix             @nbp @Ericson2314 @matthewbauer
-/pkgs/top-level/splice.nix            @Ericson2314 @matthewbauer
-/pkgs/top-level/release-cross.nix     @Ericson2314 @matthewbauer
-/pkgs/stdenv/generic                  @Ericson2314 @matthewbauer
-/pkgs/stdenv/cross                    @Ericson2314 @matthewbauer
-/pkgs/build-support/cc-wrapper        @Ericson2314 @orivej
-/pkgs/build-support/bintools-wrapper  @Ericson2314 @orivej
-/pkgs/build-support/setup-hooks       @Ericson2314
-
-# Nixpkgs build-support
-/pkgs/build-support/writers @lassulus @Profpatsch
-
-# NixOS Internals
-/nixos/default.nix          @nbp @infinisil
-/nixos/lib/from-env.nix     @nbp @infinisil
-/nixos/lib/eval-config.nix  @nbp @infinisil
-/nixos/doc/manual/configuration/abstractions.xml      @nbp
-/nixos/doc/manual/configuration/config-file.xml       @nbp
-/nixos/doc/manual/configuration/config-syntax.xml     @nbp
-/nixos/doc/manual/configuration/modularity.xml        @nbp
-/nixos/doc/manual/development/assertions.xml          @nbp
-/nixos/doc/manual/development/meta-attributes.xml     @nbp
-/nixos/doc/manual/development/option-declarations.xml @nbp
-/nixos/doc/manual/development/option-def.xml          @nbp
-/nixos/doc/manual/development/option-types.xml        @nbp
-/nixos/doc/manual/development/replace-modules.xml     @nbp
-/nixos/doc/manual/development/writing-modules.xml     @nbp
-/nixos/doc/manual/man-nixos-option.xml                @nbp
-/nixos/modules/installer/tools/nixos-option.sh        @nbp
-
-# NixOS integration test driver
-/nixos/lib/test-driver  @tfc
-
-# Updaters
-## update.nix
-/maintainers/scripts/update.nix   @jtojnar
-/maintainers/scripts/update.py    @jtojnar
-## common-updater-scripts
-/pkgs/common-updater/scripts/update-source-version    @jtojnar
-
-# Python-related code and docs
-/maintainers/scripts/update-python-libraries	@FRidh
-/pkgs/top-level/python-packages.nix     @FRidh @jonringer
-/pkgs/development/interpreters/python   @FRidh
-/pkgs/development/python-modules        @FRidh @jonringer
-/doc/languages-frameworks/python.section.md     @FRidh
-
-# Haskell
-/pkgs/development/compilers/ghc                       @cdepillabout
-/pkgs/development/haskell-modules		      @cdepillabout
-/pkgs/development/haskell-modules/default.nix	      @cdepillabout
-/pkgs/development/haskell-modules/generic-builder.nix @cdepillabout
-/pkgs/development/haskell-modules/hoogle.nix	      @cdepillabout
-
-# Perl
-/pkgs/development/interpreters/perl @volth
-/pkgs/top-level/perl-packages.nix   @volth
-/pkgs/development/perl-modules      @volth
-
-# R
-/pkgs/applications/science/math/R   @peti
-/pkgs/development/r-modules         @peti
-
-# Ruby
-/pkgs/development/interpreters/ruby @alyssais
-/pkgs/development/ruby-modules      @alyssais
-
-# Rust
-/pkgs/development/compilers/rust @Mic92 @LnL7
-/pkgs/build-support/rust @andir
-
-# Darwin-related
-/pkgs/stdenv/darwin         @NixOS/darwin-maintainers
-/pkgs/os-specific/darwin    @NixOS/darwin-maintainers
-
-# C compilers
-/pkgs/development/compilers/gcc @matthewbauer
-/pkgs/development/compilers/llvm @matthewbauer
-
-# Compatibility stuff
-/pkgs/top-level/unix-tools.nix @matthewbauer
-/pkgs/development/tools/xcbuild @matthewbauer
-
-# Beam-related (Erlang, Elixir, LFE, etc)
-/pkgs/development/beam-modules                  @gleber
-/pkgs/development/interpreters/erlang           @gleber
-/pkgs/development/interpreters/lfe              @gleber
-/pkgs/development/interpreters/elixir           @gleber
-/pkgs/development/tools/build-managers/rebar    @gleber
-/pkgs/development/tools/build-managers/rebar3   @gleber
-/pkgs/development/tools/erlang                  @gleber
-
-# Jetbrains
-/pkgs/applications/editors/jetbrains @edwtjo
-
-# Eclipse
-/pkgs/applications/editors/eclipse @rycee
-
-# Licenses
-/lib/licenses.nix @alyssais
-
-# Qt / KDE
-/pkgs/applications/kde @ttuegel
-/pkgs/desktops/plasma-5 @ttuegel
-/pkgs/development/libraries/kde-frameworks @ttuegel
-/pkgs/development/libraries/qt-5 @ttuegel
-
-# PostgreSQL and related stuff
-/pkgs/servers/sql/postgresql @thoughtpolice
-/nixos/modules/services/databases/postgresql.xml @thoughtpolice
-/nixos/modules/services/databases/postgresql.nix @thoughtpolice
-/nixos/tests/postgresql.nix @thoughtpolice
-
-# Hardened profile & related modules
-/nixos/modules/profiles/hardened.nix @joachifm
-/nixos/modules/security/hidepid.nix @joachifm
-/nixos/modules/security/lock-kernel-modules.nix @joachifm
-/nixos/modules/security/misc.nix @joachifm
-/nixos/tests/hardened.nix @joachifm
-/pkgs/os-specific/linux/kernel/hardened-config.nix @joachifm
-
-# Network Time Daemons
-/pkgs/tools/networking/chrony @thoughtpolice
-/pkgs/tools/networking/ntp @thoughtpolice
-/pkgs/tools/networking/openntpd @thoughtpolice
-/nixos/modules/services/networking/ntp @thoughtpolice
-
-# Dhall
-/pkgs/development/dhall-modules      @Gabriel439 @Profpatsch
-/pkgs/development/interpreters/dhall @Gabriel439 @Profpatsch
-
-# Idris
-/pkgs/development/idris-modules @Infinisil
-
-# Bazel
-/pkgs/development/tools/build-managers/bazel @mboes @Profpatsch
-
-# NixOS modules for e-mail and dns services
-/nixos/modules/services/mail/mailman.nix    @peti
-/nixos/modules/services/mail/postfix.nix    @peti
-/nixos/modules/services/networking/bind.nix @peti
-/nixos/modules/services/mail/rspamd.nix     @peti
-
-# Emacs
-/pkgs/applications/editors/emacs-modes @adisbladis
-/pkgs/applications/editors/emacs       @adisbladis
-/pkgs/top-level/emacs-packages.nix     @adisbladis
-
-# VimPlugins
-/pkgs/misc/vim-plugins         @jonringer @softinio
-
-# VsCode Extensions
-/pkgs/misc/vscode-extensions   @jonringer
-
-# Prometheus exporter modules and tests
-/nixos/modules/services/monitoring/prometheus/exporters.nix  @WilliButz
-/nixos/modules/services/monitoring/prometheus/exporters.xml  @WilliButz
-/nixos/tests/prometheus-exporters.nix                        @WilliButz
-
-# PHP interpreter, packages, extensions, tests and documentation
-/doc/languages-frameworks/php.section.md @NixOS/php
-/nixos/tests/php                         @NixOS/php
-/pkgs/build-support/build-pecl.nix       @NixOS/php
-/pkgs/development/interpreters/php       @NixOS/php
-/pkgs/top-level/php-packages.nix         @NixOS/php
-
-# Podman, CRI-O modules and related
-/nixos/modules/virtualisation/containers.nix @NixOS/podman
-/nixos/modules/virtualisation/cri-o.nix      @NixOS/podman
-/nixos/modules/virtualisation/podman.nix     @NixOS/podman
-/nixos/tests/podman.nix                      @NixOS/podman
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@ -1,63 +0,0 @@
-# How to contribute
-
-Note: contributing implies licensing those contributions
-under the terms of [COPYING](../COPYING), which is an MIT-like license.
-
-## Opening issues
-
-* Make sure you have a [GitHub account](https://github.com/signup/free)
-* Make sure there is no open issue on the topic
-* [Submit a new issue](https://github.com/NixOS/nixpkgs/issues/new/choose) by choosing the kind of topic and fill out the template
-
-## Submitting changes
-
-* Format the commit messages in the following way:
-
-  ```
-  (pkg-name | nixos/<module>): (from -> to | init at version | refactor | etc)
-
-  (Motivation for change. Additional information.)
-  ```
-
-  For consistency, there should not be a period at the end of the commit message's summary line (the first line of the commit message).
-
-  Examples:
-
-  * nginx: init at 2.0.1
-  * firefox: 54.0.1 -> 55.0
-  * nixos/hydra: add bazBaz option
-
-    Dual baz behavior is needed to do foo.
-  * nixos/nginx: refactor config generation
-
-    The old config generation system used impure shell scripts and could break in specific circumstances (see #1234).
-
-* `meta.description` should:
-  * Be capitalized.
-  * Not start with the package name.
-  * Not have a period at the end.
-* `meta.license` must be set and fit the upstream license.
-  * If there is no upstream license, `meta.license` should default to `stdenv.lib.licenses.unfree`.
-* `meta.maintainers` must be set.
-
-See the nixpkgs manual for more details on [standard meta-attributes](https://nixos.org/nixpkgs/manual/#sec-standard-meta-attributes) and on how to [submit changes to nixpkgs](https://nixos.org/nixpkgs/manual/#chap-submitting-changes).
-
-## Writing good commit messages
-
-In addition to writing properly formatted commit messages, it's important to include relevant information so other developers can later understand *why* a change was made. While this information usually can be found by digging code, mailing list/Discourse archives, pull request discussions or upstream changes, it may require a lot of work.
-
-For package version upgrades and such a one-line commit message is usually sufficient.
-
-## Backporting changes
-
-Follow these steps to backport a change into a release branch in compliance with the [commit policy](https://nixos.org/nixpkgs/manual/#submitting-changes-stable-release-branches).
-
-1. Take note of the commits in which the change was introduced into `master` branch.
-2. Check out the target _release branch_, e.g. `release-20.03`. Do not use a _channel branch_ like `nixos-20.03` or `nixpkgs-20.03`.
-3. Create a branch for your change, e.g. `git checkout -b backport`.
-4. When the reason to backport is not obvious from the original commit message, use `git cherry-pick -xe <original commit>` and add a reason. Otherwise use `git cherry-pick -x <original commit>`. That's fine for minor version updates that only include security and bug fixes, commits that fixes an otherwise broken package or similar.
-5. Push to GitHub and open a backport pull request. Make sure to select the release branch (e.g. `release-20.03`) as the target branch of the pull request, and link to the pull request in which the original change was comitted to `master`. The pull request title should be the commit title with the release version as prefix, e.g. `[20.03]`.
-
-## Reviewing contributions
-
-See the nixpkgs manual for more details on how to [Review contributions](https://nixos.org/nixpkgs/manual/#chap-reviewing-contributions).
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@ -1,11 +0,0 @@
-## Issue description
-
-
-
-### Steps to reproduce
-
-
-
-## Technical details
-
-Please run `nix-shell -p nix-info --run "nix-info -m"` and paste the result.
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@ -1,43 +0,0 @@
---
-name: Bug report
-about: Create a report to help us improve
-title: ''
-labels: '0.kind: bug'
-assignees: ''
-
---
-
-**Describe the bug**
-A clear and concise description of what the bug is.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. ...
-2. ...
-3. ...
-
-**Expected behavior**
-A clear and concise description of what you expected to happen.
-
-**Screenshots**
-If applicable, add screenshots to help explain your problem.
-
-**Additional context**
-Add any other context about the problem here.
-
-**Notify maintainers**
-<!--
-Please @ people who are in the `meta.maintainers` list of the offending package or module.
-If in doubt, check `git blame` for whoever last touched something.
-->
-
-**Metadata**
-Please run `nix-shell -p nix-info --run "nix-info -m"` and paste the result.
-
-Maintainer information:
-```yaml
-# a list of nixpkgs attributes affected by the problem
-attribute:
-# a list of nixos modules affected by the problem
-module:
-```
--- a/.github/ISSUE_TEMPLATE/packaging_request.md
+++ b/.github/ISSUE_TEMPLATE/packaging_request.md
@ -1,18 +0,0 @@
---
-name: Packaging requests
-about: For packages that are missing
-title: ''
-labels: '0.kind: packaging request'
-assignees: ''
-
---
-
-**Project description**
-_describe the project a little_
-
-**Metadata**
-
-* homepage URL:
-* source URL:
-* license: mit, bsd, gpl2+ , ...
-* platforms: unix, linux, darwin, ...
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@ -1,28 +0,0 @@
-<!--
-To help with the large amounts of pull requests, we would appreciate your
-reviews of other pull requests, especially simple package updates. Just leave a
-comment describing what you have tested in the relevant package/service.
-Reviewing helps to reduce the average time-to-merge for everyone.
-Thanks a lot if you do!
-List of open PRs: https://github.com/NixOS/nixpkgs/pulls
-Reviewing guidelines: https://hydra.nixos.org/job/nixpkgs/trunk/manual/latest/download/1/nixpkgs/manual.html#chap-reviewing-contributions
-->
-
-###### Motivation for this change
-
-
-###### Things done
-
-<!-- Please check what applies. Note that these are not hard requirements but merely serve as information for reviewers. -->
-
- [ ] Tested using sandboxing ([nix.useSandbox](https://nixos.org/nixos/manual/options.html#opt-nix.useSandbox) on NixOS, or option `sandbox` in [`nix.conf`](https://nixos.org/nix/manual/#sec-conf-file) on non-NixOS linux)
- Built on platform(s)
-   - [ ] NixOS
-   - [ ] macOS
-   - [ ] other Linux distributions
- [ ] Tested via one or more NixOS test(s) if existing and applicable for the change (look inside [nixos/tests](https://github.com/NixOS/nixpkgs/blob/master/nixos/tests))
- [ ] Tested compilation of all pkgs that depend on this change using `nix-shell -p nixpkgs-review --run "nixpkgs-review wip"`
- [ ] Tested execution of all binary files (usually in `./result/bin/`)
- [ ] Determined the impact on package closure size (by running `nix path-info -S` before and after)
- [ ] Ensured that relevant documentation is up to date
- [ ] Fits [CONTRIBUTING.md](https://github.com/NixOS/nixpkgs/blob/master/.github/CONTRIBUTING.md).
--- a/.github/stale.yml
+++ b/.github/stale.yml
@ -1,25 +0,0 @@
-# Configuration for probot-stale - https://github.com/probot/stale
-# Number of days of inactivity before an issue becomes stale
-daysUntilStale: 180
-# Number of days of inactivity before a stale issue is closed
-daysUntilClose: false
-# Issues with these labels will never be considered stale
-exemptLabels:
-  - "1.severity: security"
-# Label to use when marking an issue as stale
-staleLabel: "2.status: stale"
-# Comment to post when marking an issue as stale. Set to `false` to disable
-markComment: |
-  Thank you for your contributions.
-
-  This has been automatically marked as stale because it has had no activity for 180 days.
-
-  If this is still important to you, we ask that you leave a comment below. Your comment can be as simple as "still important to me". This lets people see that at least one person still cares about this. Someone will have to do this at most twice a year if there is no other activity.
-
-  Here are suggestions that might help resolve this more quickly:
-
-  1. Search for maintainers and people that previously touched the related code and @ mention them in a comment.
-  2. Ask on the [NixOS Discourse](https://discourse.nixos.org/).
-  3. Ask on the [#nixos channel](irc://irc.freenode.net/#nixos) on [irc.freenode.net](https://freenode.net).
-# Comment to post when closing a stale issue. Set to `false` to disable
-closeComment: false
--- a/.gitignore
+++ b/.gitignore
@ -3,19 +3,8 @@
 .*.swp
 .*.swo
 result
-result-*
-/doc/NEWS.html
-/doc/NEWS.txt
-/doc/manual.html
-/doc/manual.pdf
+doc/NEWS.html
+doc/NEWS.txt
+doc/manual.html
+doc/manual.pdf
 .version-suffix
-
-.DS_Store
-.mypy_cache
-
-/pkgs/development/libraries/qt-5/*/tmp/
-/pkgs/desktops/kde-5/*/tmp/
-/pkgs/development/mobile/androidenv/xml/*
-
-# generated by pkgs/common-updater/update-script.nix
-update-git-commits.txt
--- a/.version
+++ b/.version
@ -1 +1 @@
-20.09
+14.04
--- a/13
+++ b/13
@ -1,4 +1,4 @@
-Copyright (c) 2003-2020 Eelco Dolstra and the Nixpkgs/NixOS contributors
+Copyright (c) 2003-2006 Eelco Dolstra

 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
@ -18,3 +18,14 @@ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+======================================================================
+
+Note: the license above does not apply to the packages built by the
+Nix Packages collection, merely to the package descriptions (i.e., Nix
+expressions, build scripts, etc.).  Also, the license does not apply
+to some of the binaries used for bootstrapping Nixpkgs (e.g.,
+pkgs/stdenv/linux/tools/bash).  It also might not apply to patches
+included in Nixpkgs, which may be derivative works of the packages to
+which they apply.  The aforementioned artifacts are all covered by the
+licenses of the respective packages.
--- a/README.md
+++ b/README.md
@ -1,112 +1,10 @@
-<p align="center">
-  <a href="https://nixos.org/nixos"><img src="https://nixos.org/logo/nixos-hires.png" width="500px" alt="NixOS logo" /></a>
-</p>
+Nixpkgs is a collection of packages for [Nix](http://nixos.org/nix/) package
+manager. Nixpkgs also includes [NixOS](http://nixos.org/nixos/) linux distribution source code.

-<p align="center">
-  <a href="https://www.codetriage.com/nixos/nixpkgs"><img src="https://www.codetriage.com/nixos/nixpkgs/badges/users.svg" alt="Code Triagers badge" /></a>
-  <a href="https://opencollective.com/nixos"><img src="https://opencollective.com/nixos/tiers/supporter/badge.svg?label=Supporter&color=brightgreen" alt="Open Collective supporters" /></a>
-</p>
-
-[Nixpkgs](https://github.com/nixos/nixpkgs) is a collection of over
-40,000 software packages that can be installed with the
-[Nix](https://nixos.org/nix/) package manager. It also implements
-[NixOS](https://nixos.org/nixos/), a purely-functional Linux distribution.
-
-# Manuals
-
-* [NixOS Manual](https://nixos.org/nixos/manual) - how to install, configure, and maintain a purely-functional Linux distribution
-* [Nixpkgs Manual](https://nixos.org/nixpkgs/manual/) - contributing to Nixpkgs and using programming-language-specific Nix expressions
-* [Nix Package Manager Manual](https://nixos.org/nix/manual) - how to write Nix expressions (programs), and how to use Nix command line tools
-
-# Community
-
-* [Discourse Forum](https://discourse.nixos.org/)
+* [NixOS installation instructions](http://nixos.org/nixos/manual/#installing-nixos)
+* [Manual (How to write packages for Nix)](http://nixos.org/nixpkgs/manual/)
+* [Manual (NixOS)](http://nixos.org/nixos/manual/)
+* [Continuous build](http://hydra.nixos.org/jobset/nixos/trunk-combined)
+* [Tests](http://hydra.nixos.org/job/nixos/trunk-combined/tested#tabs-constituents)
+* [Mailing list](http://lists.science.uu.nl/mailman/listinfo/nix-dev)
 * [IRC - #nixos on freenode.net](irc://irc.freenode.net/#nixos)
-* [NixOS Weekly](https://weekly.nixos.org/)
-* [Community-maintained wiki](https://nixos.wiki/)
-* [Community-maintained list of ways to get in touch](https://nixos.wiki/wiki/Get_In_Touch#Chat) (Discord, Matrix, Telegram, other IRC channels, etc.)
-
-# Other Project Repositories
-
-The sources of all official Nix-related projects are in the [NixOS
-organization on GitHub](https://github.com/NixOS/). Here are some of
-the main ones:
-
-* [Nix](https://github.com/NixOS/nix) - the purely functional package manager
-* [NixOps](https://github.com/NixOS/nixops) - the tool to remotely deploy NixOS machines
-* [Nix RFCs](https://github.com/NixOS/rfcs) - the formal process for making substantial changes to the community
-* [NixOS homepage](https://github.com/NixOS/nixos-homepage) - the [NixOS.org](https://nixos.org) website
-* [hydra](https://github.com/NixOS/hydra) - our continuous integration system
-* [NixOS Artwork](https://github.com/NixOS/nixos-artwork) - NixOS artwork
-
-# Continuous Integration and Distribution
-
-Nixpkgs and NixOS are built and tested by our continuous integration
-system, [Hydra](https://hydra.nixos.org/).
-
-* [Continuous package builds for unstable/master](https://hydra.nixos.org/jobset/nixos/trunk-combined)
-* [Continuous package builds for the NixOS 20.03 release](https://hydra.nixos.org/jobset/nixos/release-20.03)
-* [Tests for unstable/master](https://hydra.nixos.org/job/nixos/trunk-combined/tested#tabs-constituents)
-* [Tests for the NixOS 20.03 release](https://hydra.nixos.org/job/nixos/release-20.03/tested#tabs-constituents)
-
-Artifacts successfully built with Hydra are published to cache at
-https://cache.nixos.org/. When successful build and test criteria are
-met, the Nixpkgs expressions are distributed via [Nix
-channels](https://nixos.org/nix/manual/#sec-channels).
-
-# Contributing
-
-Nixpkgs is among the most active projects on GitHub. While thousands
-of open issues and pull requests might seem a lot at first, it helps
-consider it in the context of the scope of the project. Nixpkgs
-describes how to build over 40,000 pieces of software and implements a
-Linux distribution. The [GitHub Insights](https://github.com/NixOS/nixpkgs/pulse)
-page gives a sense of the project activity.
-
-Community contributions are always welcome through GitHub Issues and
-Pull Requests. When pull requests are made, our tooling automation bot,
-[OfBorg](https://github.com/NixOS/ofborg) will perform various checks
-to help ensure expression quality.
-
-The *Nixpkgs maintainers* are people who have assigned themselves to
-maintain specific individual packages. We encourage people who care
-about a package to assign themselves as a maintainer. When a pull
-request is made against a package, OfBorg will notify the appropriate
-maintainer(s). The *Nixpkgs committers* are people who have been given
-permission to merge.
-
-Most contributions are based on and merged into these branches:
-
-* `master` is the main branch where all small contributions go
-* `staging` is branched from master, changes that have a big impact on
-  Hydra builds go to this branch
-* `staging-next` is branched from staging and only fixes to stabilize
-  and security fixes with a big impact on Hydra builds should be
-  contributed to this branch. This branch is merged into master when
-  deemed of sufficiently high quality
-
-For more information about contributing to the project, please visit
-the [contributing page](https://github.com/NixOS/nixpkgs/blob/master/.github/CONTRIBUTING.md).
-
-# Donations
-
-The infrastructure for NixOS and related projects is maintained by a
-nonprofit organization, the [NixOS
-Foundation](https://nixos.org/nixos/foundation.html). To ensure the
-continuity and expansion of the NixOS infrastructure, we are looking
-for donations to our organization.
-
-You can donate to the NixOS foundation by using Open Collective:
-
-<a href="https://opencollective.com/nixos#support"><img src="https://opencollective.com/nixos/tiers/supporter.svg?width=890" /></a>
-
-# License
-
-Nixpkgs is licensed under the [MIT License](COPYING).
-
-Note: MIT license does not apply to the packages built by Nixpkgs,
-merely to the files in this repository (the Nix expressions, build
-scripts, NixOS modules, etc.). It also might not apply to patches
-included in Nixpkgs, which may be derivative works of the packages to
-which they apply. The aforementioned artifacts are all covered by the
-licenses of the respective packages.
--- a/default.nix
+++ b/default.nix
@ -1,28 +1,7 @@
-let requiredVersion = import ./lib/minver.nix; in
+if ! builtins ? nixVersion || builtins.compareVersions "1.6" builtins.nixVersion == 1 then

-if ! builtins ? nixVersion || builtins.compareVersions requiredVersion builtins.nixVersion == 1 then
-
-  abort ''
-
-    This version of Nixpkgs requires Nix >= ${requiredVersion}, please upgrade:
-
-    - If you are running NixOS, `nixos-rebuild' can be used to upgrade your system.
-
-    - Alternatively, with Nix > 2.0 `nix upgrade-nix' can be used to imperatively
-      upgrade Nix. You may use `nix-env --version' to check which version you have.
-
-    - If you installed Nix using the install script (https://nixos.org/nix/install),
-      it is safe to upgrade by running it again:
-
-          curl https://nixos.org/nix/install | sh
-
-    For more information, please see the NixOS release notes at
-    https://nixos.org/nixos/manual or locally at
-    ${toString ./nixos/doc/manual/release-notes}.
-
-    If you need further help, see https://nixos.org/nixos/support.html
-  ''
+  abort "This version of Nixpkgs requires Nix >= 1.6, please upgrade!"

 else

-  import ./pkgs/top-level/impure.nix
+  import ./pkgs/top-level/all-packages.nix
--- a/doc/.gitignore
+++ b/doc/.gitignore
@ -1,8 +0,0 @@
-*.chapter.xml
-*.section.xml
-.version
-functions/library/generated
-functions/library/locations.xml
-highlightjs
-manual-full.xml
-out
--- a/doc/Makefile
+++ b/doc/Makefile
@ -1,110 +1,41 @@
-MD_TARGETS=$(addsuffix .xml, $(basename $(wildcard ./*.md ./**/*.md)))
+# You may need to override this.
+docbookxsl = $(HOME)/.nix-profile/xml/xsl/docbook
+dblatex = dblatex

-.PHONY: all
-all: validate format out/html/index.html out/epub/manual.epub
+XMLLINT = xmllint --catalogs
+XSLTPROC = xsltproc --catalogs \
+ --param section.autolabel 1 \
+ --param section.label.includes.component.label 1 \
+ --param html.stylesheet \'style.css\' \
+ --param xref.with.number.and.title 1 \
+ --param toc.section.depth 3 \
+ --param admon.style \'\' \
+ --param callout.graphics.extension \'.gif\'

-.PHONY: debug
-debug:
-	nix-shell --run "xmloscopy --docbook5 ./manual.xml ./manual-full.xml"
+NEWS_OPTS = \
+ --stringparam generate.toc "article nop" \
+ --stringparam section.autolabel.max.depth 0 \
+ --stringparam header.rule 0

-.PHONY: format
-format: doc-support/result
-	find . -iname '*.xml' -type f | while read f; do \
-		echo $$f ;\
-		xmlformat --config-file "doc-support/result/xmlformat.conf" -i $$f ;\
-	done
+all: NEWS.html NEWS.txt manual.html manual.pdf

-.PHONY: fix-misc-xml
-fix-misc-xml:
-	find . -iname '*.xml' -type f \
-		-exec ../nixos/doc/varlistentry-fixer.rb {} ';'
+NEWS.html: release-notes.xml
+	$(XSLTPROC) --nonet --xinclude --output $@ $(NEWS_OPTS) \
+	  $(docbookxsl)/html/docbook.xsl release-notes.xml

-.PHONY: clean
-clean:
-	rm -f ${MD_TARGETS} doc-support/result .version manual-full.xml functions/library/locations.xml functions/library/generated
-	rm -rf ./out/ ./highlightjs
+NEWS.txt: release-notes.xml
+	$(XSLTPROC) --nonet --xinclude quote-literals.xsl release-notes.xml | \
+	  $(XSLTPROC) --nonet --output $@.tmp.html $(NEWS_OPTS) \
+	  $(docbookxsl)/html/docbook.xsl -
+	LANG=en_US w3m -dump $@.tmp.html > $@
+	rm $@.tmp.html

-.PHONY: validate
-validate: manual-full.xml doc-support/result
-	jing doc-support/result/docbook.rng manual-full.xml
+manual.html: *.xml
+	$(XSLTPROC) --nonet --xinclude --output manual.html \
+	  $(docbookxsl)/html/docbook.xsl manual.xml

-out/html/index.html: doc-support/result manual-full.xml style.css highlightjs
-	mkdir -p out/html
-	xsltproc \
-		--nonet --xinclude \
-		--output $@ \
-		doc-support/result/xhtml.xsl \
-		./manual-full.xml
-
-	mkdir -p out/html/highlightjs/
-	cp -r highlightjs out/html/
-
-	cp ./overrides.css out/html/
-	cp ./style.css out/html/style.css
-
-	mkdir -p out/html/images/callouts
-	cp doc-support/result/xsl/docbook/images/callouts/*.svg out/html/images/callouts/
-	chmod u+w -R out/html/
-
-out/epub/manual.epub: manual-full.xml
-	mkdir -p out/epub/scratch
-	xsltproc --nonet \
-		--output out/epub/scratch/ \
-		doc-support/result/epub.xsl \
-		./manual-full.xml
-
-	cp ./overrides.css out/epub/scratch/OEBPS
-	cp ./style.css out/epub/scratch/OEBPS
-	mkdir -p out/epub/scratch/OEBPS/images/callouts/
-	cp doc-support/result/xsl/docbook/images/callouts/*.svg out/epub/scratch/OEBPS/images/callouts/
-	echo "application/epub+zip" > mimetype
-	zip -0Xq "out/epub/manual.epub" mimetype
-	rm mimetype
-	cd "out/epub/scratch/" && zip -Xr9D "../manual.epub" *
-	rm -rf "out/epub/scratch/"
-
-highlightjs: doc-support/result
-	mkdir -p highlightjs
-	cp -r doc-support/result/highlightjs/highlight.pack.js highlightjs/
-	cp -r doc-support/result/highlightjs/LICENSE highlightjs/
-	cp -r doc-support/result/highlightjs/mono-blue.css highlightjs/
-	cp -r doc-support/result/highlightjs/loader.js highlightjs/
-
-
-manual-full.xml: ${MD_TARGETS} .version functions/library/locations.xml functions/library/generated *.xml **/*.xml **/**/*.xml
-	xmllint --nonet --xinclude --noxincludenode manual.xml --output manual-full.xml
-
-.version: doc-support/result
-	ln -rfs ./doc-support/result/version .version
-
-doc-support/result: doc-support/default.nix
-	(cd doc-support; nix-build)
-
-functions/library/locations.xml: doc-support/result
-	ln -rfs ./doc-support/result/function-locations.xml functions/library/locations.xml
-
-functions/library/generated: doc-support/result
-	ln -rfs ./doc-support/result/function-docs functions/library/generated
-
-%.section.xml: %.section.md
-	pandoc $^ -w docbook \
-		-f markdown+smart \
-	  | sed -e 's|<ulink url=|<link xlink:href=|' \
-	      -e 's|</ulink>|</link>|' \
-	      -e 's|<sect. id=|<section xml:id=|' \
-	      -e 's|</sect[0-9]>|</section>|' \
-	      -e '1s| id=| xml:id=|' \
-	      -e '1s|\(<[^ ]* \)|\1xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" |' \
-	| cat  > $@
-
-%.chapter.xml: %.chapter.md
-	pandoc $^ -w docbook \
-		--top-level-division=chapter \
-		-f markdown+smart \
-	  | sed -e 's|<ulink url=|<link xlink:href=|' \
-	      -e 's|</ulink>|</link>|' \
-	      -e 's|<sect. id=|<section xml:id=|' \
-	      -e 's|</sect[0-9]>|</section>|' \
-	      -e '1s| id=| xml:id=|' \
-	      -e '1s|\(<[^ ]* \)|\1|' \
-	| cat  > $@
+manual.pdf: *.xml
+	$(dblatex) \
+	  -P doc.collab.show=0 \
+	  -P latex.output.revhistory=0 \
+	  manual.xml
--- a/doc/builders/fetchers.xml
+++ b/doc/builders/fetchers.xml
@ -1,150 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-pkgs-fetchers">
- <title>Fetchers</title>
- <para>
-  When using Nix, you will frequently need to download source code and other files from the internet. Nixpkgs comes with a few helper functions that allow you to fetch fixed-output derivations in a structured way.
- </para>
- <para>
-  The two fetcher primitives are <function>fetchurl</function> and <function>fetchzip</function>. Both of these have two required arguments, a URL and a hash. The hash is typically <literal>sha256</literal>, although many more hash algorithms are supported. Nixpkgs contributors are currently recommended to use <literal>sha256</literal>. This hash will be used by Nix to identify your source. A typical usage of fetchurl is provided below.
- </para>
-<programlisting><![CDATA[
-{ stdenv, fetchurl }:
-
-stdenv.mkDerivation {
-  name = "hello";
-  src = fetchurl {
-    url = "http://www.example.org/hello.tar.gz";
-    sha256 = "1111111111111111111111111111111111111111111111111111";
-  };
-}
-]]></programlisting>
- <para>
-  The main difference between <function>fetchurl</function> and <function>fetchzip</function> is in how they store the contents. <function>fetchurl</function> will store the unaltered contents of the URL within the Nix store. <function>fetchzip</function> on the other hand will decompress the archive for you, making files and directories directly accessible in the future. <function>fetchzip</function> can only be used with archives. Despite the name, <function>fetchzip</function> is not limited to .zip files and can also be used with any tarball.
- </para>
- <para>
-  <function>fetchpatch</function> works very similarly to <function>fetchurl</function> with the same arguments expected. It expects patch files as a source and and performs normalization on them before computing the checksum. For example it will remove comments or other unstable parts that are sometimes added by version control systems and can change over time.
- </para>
- <para>
-  Other fetcher functions allow you to add source code directly from a VCS such as subversion or git. These are mostly straightforward names based on the name of the command used with the VCS system. Because they give you a working repository, they act most like <function>fetchzip</function>.
- </para>
- <variablelist>
-  <varlistentry>
-   <term>
-    <literal>fetchsvn</literal>
-   </term>
-   <listitem>
-    <para>
-     Used with Subversion. Expects <literal>url</literal> to a Subversion directory, <literal>rev</literal>, and <literal>sha256</literal>.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>fetchgit</literal>
-   </term>
-   <listitem>
-    <para>
-     Used with Git. Expects <literal>url</literal> to a Git repo, <literal>rev</literal>, and <literal>sha256</literal>. <literal>rev</literal> in this case can be full the git commit id (SHA1 hash) or a tag name like <literal>refs/tags/v1.0</literal>.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>fetchfossil</literal>
-   </term>
-   <listitem>
-    <para>
-     Used with Fossil. Expects <literal>url</literal> to a Fossil archive, <literal>rev</literal>, and <literal>sha256</literal>.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>fetchcvs</literal>
-   </term>
-   <listitem>
-    <para>
-     Used with CVS. Expects <literal>cvsRoot</literal>, <literal>tag</literal>, and <literal>sha256</literal>.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>fetchhg</literal>
-   </term>
-   <listitem>
-    <para>
-     Used with Mercurial. Expects <literal>url</literal>, <literal>rev</literal>, and <literal>sha256</literal>.
-    </para>
-   </listitem>
-  </varlistentry>
- </variablelist>
- <para>
-  A number of fetcher functions wrap part of <function>fetchurl</function> and <function>fetchzip</function>. They are mainly convenience functions intended for commonly used destinations of source code in Nixpkgs. These wrapper fetchers are listed below.
- </para>
- <variablelist>
-  <varlistentry>
-   <term>
-    <literal>fetchFromGitHub</literal>
-   </term>
-   <listitem>
-    <para>
-     <function>fetchFromGitHub</function> expects four arguments. <literal>owner</literal> is a string corresponding to the GitHub user or organization that controls this repository. <literal>repo</literal> corresponds to the name of the software repository. These are located at the top of every GitHub HTML page as <literal>owner</literal>/<literal>repo</literal>. <literal>rev</literal> corresponds to the Git commit hash or tag (e.g <literal>v1.0</literal>) that will be downloaded from Git. Finally, <literal>sha256</literal> corresponds to the hash of the extracted directory. Again, other hash algorithms are also available but <literal>sha256</literal> is currently preferred.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>fetchFromGitLab</literal>
-   </term>
-   <listitem>
-    <para>
-     This is used with GitLab repositories. The arguments expected are very similar to fetchFromGitHub above.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>fetchFromGitiles</literal>
-   </term>
-   <listitem>
-    <para>
-     This is used with Gitiles repositories. The arguments expected
-     are similar to fetchgit.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>fetchFromBitbucket</literal>
-   </term>
-   <listitem>
-    <para>
-     This is used with BitBucket repositories. The arguments expected are very similar to fetchFromGitHub above.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>fetchFromSavannah</literal>
-   </term>
-   <listitem>
-    <para>
-     This is used with Savannah repositories. The arguments expected are very similar to fetchFromGitHub above.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>fetchFromRepoOrCz</literal>
-   </term>
-   <listitem>
-    <para>
-     This is used with repo.or.cz repositories. The arguments expected are very similar to fetchFromGitHub above.
-    </para>
-   </listitem>
-  </varlistentry>
- </variablelist>
-</chapter>
--- a/doc/builders/images.xml
+++ b/doc/builders/images.xml
@ -1,12 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-images">
- <title>Images</title>
- <para>
-  This chapter describes tools for creating various types of images.
- </para>
- <xi:include href="images/appimagetools.xml" />
- <xi:include href="images/dockertools.xml" />
- <xi:include href="images/ocitools.xml" />
- <xi:include href="images/snaptools.xml" />
-</chapter>
--- a/doc/builders/images/appimagetools.xml
+++ b/doc/builders/images/appimagetools.xml
@ -1,102 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-pkgs-appimageTools">
- <title>pkgs.appimageTools</title>
-
- <para>
-  <varname>pkgs.appimageTools</varname> is a set of functions for extracting and wrapping <link xlink:href="https://appimage.org/">AppImage</link> files. They are meant to be used if traditional packaging from source is infeasible, or it would take too long. To quickly run an AppImage file, <literal>pkgs.appimage-run</literal> can be used as well.
- </para>
-
- <warning>
-  <para>
-   The <varname>appimageTools</varname> API is unstable and may be subject to backwards-incompatible changes in the future.
-  </para>
- </warning>
-
- <section xml:id="ssec-pkgs-appimageTools-formats">
-  <title>AppImage formats</title>
-
-  <para>
-   There are different formats for AppImages, see <link xlink:href="https://github.com/AppImage/AppImageSpec/blob/74ad9ca2f94bf864a4a0dac1f369dd4f00bd1c28/draft.md#image-format">the specification</link> for details.
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Type 1 images are ISO 9660 files that are also ELF executables.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Type 2 images are ELF executables with an appended filesystem.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <para>
-   They can be told apart with <command>file -k</command>:
-  </para>
-
-<screen>
-<prompt>$ </prompt>file -k type1.AppImage
-type1.AppImage: ELF 64-bit LSB executable, x86-64, version 1 (SYSV) ISO 9660 CD-ROM filesystem data 'AppImage' (Lepton 3.x), scale 0-0,
-spot sensor temperature 0.000000, unit celsius, color scheme 0, calibration: offset 0.000000, slope 0.000000, dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.18, BuildID[sha1]=d629f6099d2344ad82818172add1d38c5e11bc6d, stripped\012- data
-
-<prompt>$ </prompt>file -k type2.AppImage
-type2.AppImage: ELF 64-bit LSB executable, x86-64, version 1 (SYSV) (Lepton 3.x), scale 232-60668, spot sensor temperature -4.187500, color scheme 15, show scale bar, calibration: offset -0.000000, slope 0.000000 (Lepton 2.x), scale 4111-45000, spot sensor temperature 412442.250000, color scheme 3, minimum point enabled, calibration: offset -75402534979642766821519867692934234112.000000, slope 5815371847733706829839455140374904832.000000, dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.18, BuildID[sha1]=79dcc4e55a61c293c5e19edbd8d65b202842579f, stripped\012- data
-</screen>
-
-  <para>
-   Note how the type 1 AppImage is described as an <literal>ISO 9660 CD-ROM filesystem</literal>, and the type 2 AppImage is not.
-  </para>
- </section>
-
- <section xml:id="ssec-pkgs-appimageTools-wrapping">
-  <title>Wrapping</title>
-
-  <para>
-   Depending on the type of AppImage you're wrapping, you'll have to use <varname>wrapType1</varname> or <varname>wrapType2</varname>.
-  </para>
-
-<programlisting>
-appimageTools.wrapType2 { # or wrapType1
-  name = "patchwork"; <co xml:id='ex-appimageTools-wrapping-1' />
-  src = fetchurl { <co xml:id='ex-appimageTools-wrapping-2' />
-    url = "https://github.com/ssbc/patchwork/releases/download/v3.11.4/Patchwork-3.11.4-linux-x86_64.AppImage";
-    sha256 =  "1blsprpkvm0ws9b96gb36f0rbf8f5jgmw4x6dsb1kswr4ysf591s";
-  };
-  extraPkgs = pkgs: with pkgs; [ ]; <co xml:id='ex-appimageTools-wrapping-3' />
-}</programlisting>
-
-  <calloutlist>
-   <callout arearefs='ex-appimageTools-wrapping-1'>
-    <para>
-     <varname>name</varname> specifies the name of the resulting image.
-    </para>
-   </callout>
-   <callout arearefs='ex-appimageTools-wrapping-2'>
-    <para>
-     <varname>src</varname> specifies the AppImage file to extract.
-    </para>
-   </callout>
-   <callout arearefs='ex-appimageTools-wrapping-3'>
-    <para>
-     <varname>extraPkgs</varname> allows you to pass a function to include additional packages inside the FHS environment your AppImage is going to run in. There are a few ways to learn which dependencies an application needs:
-     <itemizedlist>
-      <listitem>
-       <para>
-        Looking through the extracted AppImage files, reading its scripts and running <command>patchelf</command> and <command>ldd</command> on its executables. This can also be done in <command>appimage-run</command>, by setting <command>APPIMAGE_DEBUG_EXEC=bash</command>.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Running <command>strace -vfefile</command> on the wrapped executable, looking for libraries that can't be found.
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-   </callout>
-  </calloutlist>
- </section>
-</section>
--- a/doc/builders/images/dockertools.xml
+++ b/doc/builders/images/dockertools.xml
@ -1,478 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-pkgs-dockerTools">
- <title>pkgs.dockerTools</title>
-
- <para>
-  <varname>pkgs.dockerTools</varname> is a set of functions for creating and manipulating Docker images according to the <link xlink:href="https://github.com/moby/moby/blob/master/image/spec/v1.2.md#docker-image-specification-v120"> Docker Image Specification v1.2.0 </link>. Docker itself is not used to perform any of the operations done by these functions.
- </para>
-
- <section xml:id="ssec-pkgs-dockerTools-buildImage">
-  <title>buildImage</title>
-
-  <para>
-   This function is analogous to the <command>docker build</command> command, in that it can be used to build a Docker-compatible repository tarball containing a single image with one or multiple layers. As such, the result is suitable for being loaded in Docker with <command>docker load</command>.
-  </para>
-
-  <para>
-   The parameters of <varname>buildImage</varname> with relative example values are described below:
-  </para>
-
-  <example xml:id='ex-dockerTools-buildImage'>
-   <title>Docker build</title>
-<programlisting>
-buildImage {
-  name = "redis"; <co xml:id='ex-dockerTools-buildImage-1' />
-  tag = "latest"; <co xml:id='ex-dockerTools-buildImage-2' />
-
-  fromImage = someBaseImage; <co xml:id='ex-dockerTools-buildImage-3' />
-  fromImageName = null; <co xml:id='ex-dockerTools-buildImage-4' />
-  fromImageTag = "latest"; <co xml:id='ex-dockerTools-buildImage-5' />
-
-  contents = pkgs.redis; <co xml:id='ex-dockerTools-buildImage-6' />
-  runAsRoot = '' <co xml:id='ex-dockerTools-buildImage-runAsRoot' />
-    #!${pkgs.runtimeShell}
-    mkdir -p /data
-  '';
-
-  config = { <co xml:id='ex-dockerTools-buildImage-8' />
-    Cmd = [ "/bin/redis-server" ];
-    WorkingDir = "/data";
-    Volumes = {
-      "/data" = {};
-    };
-  };
-}
-</programlisting>
-  </example>
-
-  <para>
-   The above example will build a Docker image <literal>redis/latest</literal> from the given base image. Loading and running this image in Docker results in <literal>redis-server</literal> being started automatically.
-  </para>
-
-  <calloutlist>
-   <callout arearefs='ex-dockerTools-buildImage-1'>
-    <para>
-     <varname>name</varname> specifies the name of the resulting image. This is the only required argument for <varname>buildImage</varname>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-2'>
-    <para>
-     <varname>tag</varname> specifies the tag of the resulting image. By default it's <literal>null</literal>, which indicates that the nix output hash will be used as tag.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-3'>
-    <para>
-     <varname>fromImage</varname> is the repository tarball containing the base image. It must be a valid Docker image, such as exported by <command>docker save</command>. By default it's <literal>null</literal>, which can be seen as equivalent to <literal>FROM scratch</literal> of a <filename>Dockerfile</filename>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-4'>
-    <para>
-     <varname>fromImageName</varname> can be used to further specify the base image within the repository, in case it contains multiple images. By default it's <literal>null</literal>, in which case <varname>buildImage</varname> will peek the first image available in the repository.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-5'>
-    <para>
-     <varname>fromImageTag</varname> can be used to further specify the tag of the base image within the repository, in case an image contains multiple tags. By default it's <literal>null</literal>, in which case <varname>buildImage</varname> will peek the first tag available for the base image.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-6'>
-    <para>
-     <varname>contents</varname> is a derivation that will be copied in the new layer of the resulting image. This can be similarly seen as <command>ADD contents/ /</command> in a <filename>Dockerfile</filename>. By default it's <literal>null</literal>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-runAsRoot'>
-    <para>
-     <varname>runAsRoot</varname> is a bash script that will run as root in an environment that overlays the existing layers of the base image with the new resulting layer, including the previously copied <varname>contents</varname> derivation. This can be similarly seen as <command>RUN ...</command> in a <filename>Dockerfile</filename>.
-     <note>
-      <para>
-       Using this parameter requires the <literal>kvm</literal> device to be available.
-      </para>
-     </note>
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-buildImage-8'>
-    <para>
-     <varname>config</varname> is used to specify the configuration of the containers that will be started off the built image in Docker. The available options are listed in the <link xlink:href="https://github.com/moby/moby/blob/master/image/spec/v1.2.md#image-json-field-descriptions"> Docker Image Specification v1.2.0 </link>.
-    </para>
-   </callout>
-  </calloutlist>
-
-  <para>
-   After the new layer has been created, its closure (to which <varname>contents</varname>, <varname>config</varname> and <varname>runAsRoot</varname> contribute) will be copied in the layer itself. Only new dependencies that are not already in the existing layers will be copied.
-  </para>
-
-  <para>
-   At the end of the process, only one new single layer will be produced and added to the resulting image.
-  </para>
-
-  <para>
-   The resulting repository will only list the single image <varname>image/tag</varname>. In the case of <xref linkend='ex-dockerTools-buildImage'/> it would be <varname>redis/latest</varname>.
-  </para>
-
-  <para>
-   It is possible to inspect the arguments with which an image was built using its <varname>buildArgs</varname> attribute.
-  </para>
-
-  <note>
-   <para>
-    If you see errors similar to <literal>getProtocolByName: does not exist (no such protocol name: tcp)</literal> you may need to add <literal>pkgs.iana-etc</literal> to <varname>contents</varname>.
-   </para>
-  </note>
-
-  <note>
-   <para>
-    If you see errors similar to <literal>Error_Protocol ("certificate has unknown CA",True,UnknownCa)</literal> you may need to add <literal>pkgs.cacert</literal> to <varname>contents</varname>.
-   </para>
-  </note>
-
-  <example xml:id="example-pkgs-dockerTools-buildImage-creation-date">
-   <title>Impurely Defining a Docker Layer's Creation Date</title>
-   <para>
-    By default <function>buildImage</function> will use a static date of one second past the UNIX Epoch. This allows <function>buildImage</function> to produce binary reproducible images. When listing images with <command>docker images</command>, the newly created images will be listed like this:
-   </para>
-<screen><![CDATA[
-$ docker images
-REPOSITORY   TAG      IMAGE ID       CREATED        SIZE
-hello        latest   08c791c7846e   48 years ago   25.2MB
-]]></screen>
-   <para>
-    You can break binary reproducibility but have a sorted, meaningful <literal>CREATED</literal> column by setting <literal>created</literal> to <literal>now</literal>.
-   </para>
-<programlisting><![CDATA[
-pkgs.dockerTools.buildImage {
-  name = "hello";
-  tag = "latest";
-  created = "now";
-  contents = pkgs.hello;
-
-  config.Cmd = [ "/bin/hello" ];
-}
-]]></programlisting>
-   <para>
-    and now the Docker CLI will display a reasonable date and sort the images as expected:
-<screen><![CDATA[
-$ docker images
-REPOSITORY   TAG      IMAGE ID       CREATED              SIZE
-hello        latest   de2bf4786de6   About a minute ago   25.2MB
-]]></screen>
-    however, the produced images will not be binary reproducible.
-   </para>
-  </example>
- </section>
-
- <section xml:id="ssec-pkgs-dockerTools-buildLayeredImage">
-  <title>buildLayeredImage</title>
-
-  <para>
-   Create a Docker image with many of the store paths being on their own layer to improve sharing between images.
-  </para>
-
-  <variablelist>
-   <varlistentry>
-    <term>
-     <varname>name</varname>
-    </term>
-    <listitem>
-     <para>
-      The name of the resulting image.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>tag</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Tag of the generated image.
-     </para>
-     <para>
-      <emphasis>Default:</emphasis> the output path's hash
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>contents</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Top level paths in the container. Either a single derivation, or a list of derivations.
-     </para>
-     <para>
-      <emphasis>Default:</emphasis> <literal>[]</literal>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>config</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Run-time configuration of the container. A full list of the options are available at in the <link xlink:href="https://github.com/moby/moby/blob/master/image/spec/v1.2.md#image-json-field-descriptions"> Docker Image Specification v1.2.0 </link>.
-     </para>
-     <para>
-      <emphasis>Default:</emphasis> <literal>{}</literal>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>created</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Date and time the layers were created. Follows the same <literal>now</literal> exception supported by <literal>buildImage</literal>.
-     </para>
-     <para>
-      <emphasis>Default:</emphasis> <literal>1970-01-01T00:00:01Z</literal>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>maxLayers</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Maximum number of layers to create.
-     </para>
-     <para>
-      <emphasis>Default:</emphasis> <literal>100</literal>
-     </para>
-     <para>
-      <emphasis>Maximum:</emphasis> <literal>125</literal>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>extraCommands</varname> <emphasis>optional</emphasis>
-    </term>
-    <listitem>
-     <para>
-      Shell commands to run while building the final layer, without access to most of the layer contents. Changes to this layer are "on top" of all the other layers, so can create additional directories and files.
-     </para>
-    </listitem>
-   </varlistentry>
-  </variablelist>
-
-  <section xml:id="dockerTools-buildLayeredImage-arg-contents">
-   <title>Behavior of <varname>contents</varname> in the final image</title>
-
-   <para>
-    Each path directly listed in <varname>contents</varname> will have a symlink in the root of the image.
-   </para>
-
-   <para>
-    For example:
-<programlisting><![CDATA[
-pkgs.dockerTools.buildLayeredImage {
-  name = "hello";
-  contents = [ pkgs.hello ];
-}
-]]></programlisting>
-    will create symlinks for all the paths in the <literal>hello</literal> package:
-<screen><![CDATA[
-/bin/hello -> /nix/store/h1zb1padqbbb7jicsvkmrym3r6snphxg-hello-2.10/bin/hello
-/share/info/hello.info -> /nix/store/h1zb1padqbbb7jicsvkmrym3r6snphxg-hello-2.10/share/info/hello.info
-/share/locale/bg/LC_MESSAGES/hello.mo -> /nix/store/h1zb1padqbbb7jicsvkmrym3r6snphxg-hello-2.10/share/locale/bg/LC_MESSAGES/hello.mo
-]]></screen>
-   </para>
-  </section>
-
-  <section xml:id="dockerTools-buildLayeredImage-arg-config">
-   <title>Automatic inclusion of <varname>config</varname> references</title>
-
-   <para>
-    The closure of <varname>config</varname> is automatically included in the closure of the final image.
-   </para>
-
-   <para>
-    This allows you to make very simple Docker images with very little code. This container will start up and run <command>hello</command>:
-<programlisting><![CDATA[
-pkgs.dockerTools.buildLayeredImage {
-  name = "hello";
-  config.Cmd = [ "${pkgs.hello}/bin/hello" ];
-}
-]]></programlisting>
-   </para>
-  </section>
-
-  <section xml:id="dockerTools-buildLayeredImage-arg-maxLayers">
-   <title>Adjusting <varname>maxLayers</varname></title>
-
-   <para>
-    Increasing the <varname>maxLayers</varname> increases the number of layers which have a chance to be shared between different images.
-   </para>
-
-   <para>
-    Modern Docker installations support up to 128 layers, however older versions support as few as 42.
-   </para>
-
-   <para>
-    If the produced image will not be extended by other Docker builds, it is safe to set <varname>maxLayers</varname> to <literal>128</literal>. However it will be impossible to extend the image further.
-   </para>
-
-   <para>
-    The first (<literal>maxLayers-2</literal>) most "popular" paths will have their own individual layers, then layer #<literal>maxLayers-1</literal> will contain all the remaining "unpopular" paths, and finally layer #<literal>maxLayers</literal> will contain the Image configuration.
-   </para>
-
-   <para>
-    Docker's Layers are not inherently ordered, they are content-addressable and are not explicitly layered until they are composed in to an Image.
-   </para>
-  </section>
- </section>
-
- <section xml:id="ssec-pkgs-dockerTools-fetchFromRegistry">
-  <title>pullImage</title>
-
-  <para>
-   This function is analogous to the <command>docker pull</command> command, in that it can be used to pull a Docker image from a Docker registry. By default <link xlink:href="https://hub.docker.com/">Docker Hub</link> is used to pull images.
-  </para>
-
-  <para>
-   Its parameters are described in the example below:
-  </para>
-
-  <example xml:id='ex-dockerTools-pullImage'>
-   <title>Docker pull</title>
-<programlisting>
-pullImage {
-  imageName = "nixos/nix"; <co xml:id='ex-dockerTools-pullImage-1' />
-  imageDigest = "sha256:20d9485b25ecfd89204e843a962c1bd70e9cc6858d65d7f5fadc340246e2116b"; <co xml:id='ex-dockerTools-pullImage-2' />
-  finalImageName = "nix"; <co xml:id='ex-dockerTools-pullImage-3' />
-  finalImageTag = "1.11";  <co xml:id='ex-dockerTools-pullImage-4' />
-  sha256 = "0mqjy3zq2v6rrhizgb9nvhczl87lcfphq9601wcprdika2jz7qh8"; <co xml:id='ex-dockerTools-pullImage-5' />
-  os = "linux"; <co xml:id='ex-dockerTools-pullImage-6' />
-  arch = "x86_64"; <co xml:id='ex-dockerTools-pullImage-7' />
-}
-</programlisting>
-  </example>
-
-  <calloutlist>
-   <callout arearefs='ex-dockerTools-pullImage-1'>
-    <para>
-     <varname>imageName</varname> specifies the name of the image to be downloaded, which can also include the registry namespace (e.g. <literal>nixos</literal>). This argument is required.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-2'>
-    <para>
-     <varname>imageDigest</varname> specifies the digest of the image to be downloaded. This argument is required.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-3'>
-    <para>
-     <varname>finalImageName</varname>, if specified, this is the name of the image to be created. Note it is never used to fetch the image since we prefer to rely on the immutable digest ID. By default it's equal to <varname>imageName</varname>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-4'>
-    <para>
-     <varname>finalImageTag</varname>, if specified, this is the tag of the image to be created. Note it is never used to fetch the image since we prefer to rely on the immutable digest ID. By default it's <literal>latest</literal>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-5'>
-    <para>
-     <varname>sha256</varname> is the checksum of the whole fetched image. This argument is required.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-6'>
-    <para>
-     <varname>os</varname>, if specified, is the operating system of the fetched image. By default it's <literal>linux</literal>.
-    </para>
-   </callout>
-   <callout arearefs='ex-dockerTools-pullImage-7'>
-    <para>
-     <varname>arch</varname>, if specified, is the cpu architecture of the fetched image. By default it's <literal>x86_64</literal>.
-    </para>
-   </callout>
-  </calloutlist>
-
-  <para>
-   <literal>nix-prefetch-docker</literal> command can be used to get required image parameters:
-<screen>
-<prompt>$ </prompt>nix run nixpkgs.nix-prefetch-docker -c nix-prefetch-docker --image-name mysql --image-tag 5
-</screen>
-   Since a given <varname>imageName</varname> may transparently refer to a manifest list of images which support multiple architectures and/or operating systems, you can supply the <option>--os</option> and <option>--arch</option> arguments to specify exactly which image you want. By default it will match the OS and architecture of the host the command is run on.
-<screen>
-<prompt>$ </prompt>nix-prefetch-docker --image-name mysql --image-tag 5 --arch x86_64 --os linux
-</screen>
-   Desired image name and tag can be set using <option>--final-image-name</option> and <option>--final-image-tag</option> arguments:
-<screen>
-<prompt>$ </prompt>nix-prefetch-docker --image-name mysql --image-tag 5 --final-image-name eu.gcr.io/my-project/mysql --final-image-tag prod
-</screen>
-  </para>
- </section>
-
- <section xml:id="ssec-pkgs-dockerTools-exportImage">
-  <title>exportImage</title>
-
-  <para>
-   This function is analogous to the <command>docker export</command> command, in that it can be used to flatten a Docker image that contains multiple layers. It is in fact the result of the merge of all the layers of the image. As such, the result is suitable for being imported in Docker with <command>docker import</command>.
-  </para>
-
-  <note>
-   <para>
-    Using this function requires the <literal>kvm</literal> device to be available.
-   </para>
-  </note>
-
-  <para>
-   The parameters of <varname>exportImage</varname> are the following:
-  </para>
-
-  <example xml:id='ex-dockerTools-exportImage'>
-   <title>Docker export</title>
-<programlisting>
-exportImage {
-  fromImage = someLayeredImage;
-  fromImageName = null;
-  fromImageTag = null;
-
-  name = someLayeredImage.name;
-}
-</programlisting>
-  </example>
-
-  <para>
-   The parameters relative to the base image have the same synopsis as described in <xref linkend='ssec-pkgs-dockerTools-buildImage'/>, except that <varname>fromImage</varname> is the only required argument in this case.
-  </para>
-
-  <para>
-   The <varname>name</varname> argument is the name of the derivation output, which defaults to <varname>fromImage.name</varname>.
-  </para>
- </section>
-
- <section xml:id="ssec-pkgs-dockerTools-shadowSetup">
-  <title>shadowSetup</title>
-
-  <para>
-   This constant string is a helper for setting up the base files for managing users and groups, only if such files don't exist already. It is suitable for being used in a <varname>runAsRoot</varname> <xref linkend='ex-dockerTools-buildImage-runAsRoot'/> script for cases like in the example below:
-  </para>
-
-  <example xml:id='ex-dockerTools-shadowSetup'>
-   <title>Shadow base files</title>
-<programlisting>
-buildImage {
-  name = "shadow-basic";
-
-  runAsRoot = ''
-    #!${pkgs.runtimeShell}
-    ${shadowSetup}
-    groupadd -r redis
-    useradd -r -g redis redis
-    mkdir /data
-    chown redis:redis /data
-  '';
-}
-</programlisting>
-  </example>
-
-  <para>
-   Creating base files like <literal>/etc/passwd</literal> or <literal>/etc/login.defs</literal> is necessary for shadow-utils to manipulate users and groups.
-  </para>
- </section>
-</section>
--- a/doc/builders/images/ocitools.xml
+++ b/doc/builders/images/ocitools.xml
@ -1,62 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-pkgs-ociTools">
- <title>pkgs.ociTools</title>
-
- <para>
-  <varname>pkgs.ociTools</varname> is a set of functions for creating containers according to the <link xlink:href="https://github.com/opencontainers/runtime-spec">OCI container specification v1.0.0</link>. Beyond that it makes no assumptions about the container runner you choose to use to run the created container.
- </para>
-
- <section xml:id="ssec-pkgs-ociTools-buildContainer">
-  <title>buildContainer</title>
-
-  <para>
-   This function creates a simple OCI container that runs a single command inside of it. An OCI container consists of a <varname>config.json</varname> and a rootfs directory.The nix store of the container will contain all referenced dependencies of the given command.
-  </para>
-
-  <para>
-   The parameters of <varname>buildContainer</varname> with an example value are described below:
-  </para>
-
-  <example xml:id='ex-ociTools-buildContainer'>
-   <title>Build Container</title>
-<programlisting>
-buildContainer {
-  args = [ (with pkgs; writeScript "run.sh" ''
-    #!${bash}/bin/bash
-    exec ${bash}/bin/bash
-  '').outPath ]; <co xml:id='ex-ociTools-buildContainer-1' />
-
-  mounts = {
-    "/data" = {
-      type = "none";
-      source = "/var/lib/mydata";
-      options = [ "bind" ];
-    };
-  };<co xml:id='ex-ociTools-buildContainer-2' />
-
-  readonly = false; <co xml:id='ex-ociTools-buildContainer-3' />
-}
-
-    </programlisting>
-   <calloutlist>
-    <callout arearefs='ex-ociTools-buildContainer-1'>
-     <para>
-      <varname>args</varname> specifies a set of arguments to run inside the container. This is the only required argument for <varname>buildContainer</varname>. All referenced packages inside the derivation will be made available inside the container
-     </para>
-    </callout>
-    <callout arearefs='ex-ociTools-buildContainer-2'>
-     <para>
-      <varname>mounts</varname> specifies additional mount points chosen by the user. By default only a minimal set of necessary filesystems are mounted into the container (e.g procfs, cgroupfs)
-     </para>
-    </callout>
-    <callout arearefs='ex-ociTools-buildContainer-3'>
-     <para>
-      <varname>readonly</varname> makes the container's rootfs read-only if it is set to true. The default value is false <literal>false</literal>.
-     </para>
-    </callout>
-   </calloutlist>
-  </example>
- </section>
-</section>
--- a/doc/builders/images/snap/example-firefox.nix
+++ b/doc/builders/images/snap/example-firefox.nix
@ -1,28 +0,0 @@
-let
-  inherit (import <nixpkgs> { }) snapTools firefox;
-in snapTools.makeSnap {
-  meta = {
-    name = "nix-example-firefox";
-    summary = firefox.meta.description;
-    architectures = [ "amd64" ];
-    apps.nix-example-firefox = {
-      command = "${firefox}/bin/firefox";
-      plugs = [
-        "pulseaudio"
-        "camera"
-        "browser-support"
-        "avahi-observe"
-        "cups-control"
-        "desktop"
-        "desktop-legacy"
-        "gsettings"
-        "home"
-        "network"
-        "mount-observe"
-        "removable-media"
-        "x11"
-      ];
-    };
-    confinement = "strict";
-  };
-}
--- a/doc/builders/images/snap/example-hello.nix
+++ b/doc/builders/images/snap/example-hello.nix
@ -1,12 +0,0 @@
-let
-  inherit (import <nixpkgs> { }) snapTools hello;
-in snapTools.makeSnap {
-  meta = {
-    name = "hello";
-    summary = hello.meta.description;
-    description = hello.meta.longDescription;
-    architectures = [ "amd64" ];
-    confinement = "strict";
-    apps.hello.command = "${hello}/bin/hello";
-  };
-}
--- a/doc/builders/images/snaptools.xml
+++ b/doc/builders/images/snaptools.xml
@ -1,59 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-pkgs-snapTools">
- <title>pkgs.snapTools</title>
-
- <para>
-  <varname>pkgs.snapTools</varname> is a set of functions for creating Snapcraft images. Snap and Snapcraft is not used to perform these operations.
- </para>
-
- <section xml:id="ssec-pkgs-snapTools-makeSnap-signature">
-  <title>The makeSnap Function</title>
-
-  <para>
-   <function>makeSnap</function> takes a single named argument, <parameter>meta</parameter>. This argument mirrors <link xlink:href="https://docs.snapcraft.io/snap-format">the upstream <filename>snap.yaml</filename> format</link> exactly.
-  </para>
-
-  <para>
-   The <parameter>base</parameter> should not be be specified, as <function>makeSnap</function> will force set it.
-  </para>
-
-  <para>
-   Currently, <function>makeSnap</function> does not support creating GUI stubs.
-  </para>
- </section>
-
- <section xml:id="ssec-pkgs-snapTools-build-a-snap-hello">
-  <title>Build a Hello World Snap</title>
-
-  <example xml:id="ex-snapTools-buildSnap-hello">
-   <title>Making a Hello World Snap</title>
-   <para>
-    The following expression packages GNU Hello as a Snapcraft snap.
-   </para>
-<programlisting><xi:include href="./snap/example-hello.nix" parse="text" /></programlisting>
-   <para>
-    <command>nix-build</command> this expression and install it with <command>snap install ./result --dangerous</command>. <command>hello</command> will now be the Snapcraft version of the package.
-   </para>
-  </example>
- </section>
-
- <section xml:id="ssec-pkgs-snapTools-build-a-snap-firefox">
-  <title>Build a Hello World Snap</title>
-
-  <example xml:id="ex-snapTools-buildSnap-firefox">
-   <title>Making a Graphical Snap</title>
-   <para>
-    Graphical programs require many more integrations with the host. This example uses Firefox as an example, because it is one of the most complicated programs we could package.
-   </para>
-<programlisting><xi:include href="./snap/example-firefox.nix" parse="text" /></programlisting>
-   <para>
-    <command>nix-build</command> this expression and install it with <command>snap install ./result --dangerous</command>. <command>nix-example-firefox</command> will now be the Snapcraft version of the Firefox package.
-   </para>
-   <para>
-    The specific meaning behind plugs can be looked up in the <link xlink:href="https://docs.snapcraft.io/supported-interfaces">Snapcraft interface documentation</link>.
-   </para>
-  </example>
- </section>
-</section>
--- a/doc/builders/packages/citrix.xml
+++ b/doc/builders/packages/citrix.xml
@ -1,44 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-citrix">
- <title>Citrix Workspace</title>
-
- <para>
-  <note>
-   <para>
-    Please note that the <literal>citrix_receiver</literal> package has been deprecated since its development was <link xlink:href="https://docs.citrix.com/en-us/citrix-workspace-app.html">discontinued by upstream</link> and has been replaced by <link xlink:href="https://www.citrix.com/products/workspace-app/">the citrix workspace app</link>.
-   </para>
-  </note>
-  <link xlink:href="https://www.citrix.com/products/receiver/">Citrix Receiver</link> and <link xlink:href="https://www.citrix.com/products/workspace-app/">Citrix Workspace App</link> are a remote desktop viewers which provide access to <link xlink:href="https://www.citrix.com/products/xenapp-xendesktop/">XenDesktop</link> installations.
- </para>
-
- <section xml:id="sec-citrix-base">
-  <title>Basic usage</title>
-
-  <para>
-   The tarball archive needs to be downloaded manually as the license agreements of the vendor for <link xlink:href="https://www.citrix.com/downloads/citrix-receiver/">Citrix Receiver</link> or <link xlink:href="https://www.citrix.de/downloads/workspace-app/linux/workspace-app-for-linux-latest.html">Citrix Workspace</link> need to be accepted first. Then run <command>nix-prefetch-url file://$PWD/linuxx64-$version.tar.gz</command>. With the archive available in the store the package can be built and installed with Nix.
-  </para>
-
-  <warning>
-   <title>Caution with <command>nix-shell</command> installs</title>
-   <para>
-    It's recommended to install <literal>Citrix Receiver</literal> and/or <literal>Citrix Workspace</literal> using <literal>nix-env -i</literal> or globally to ensure that the <literal>.desktop</literal> files are installed properly into <literal>$XDG_CONFIG_DIRS</literal>. Otherwise it won't be possible to open <literal>.ica</literal> files automatically from the browser to start a Citrix connection.
-   </para>
-  </warning>
- </section>
-
- <section xml:id="sec-citrix-custom-certs">
-  <title>Custom certificates</title>
-
-  <para>
-   The <literal>Citrix Workspace App</literal> in <literal>nixpkgs</literal> trust several certificates <link xlink:href="https://curl.haxx.se/docs/caextract.html">from the Mozilla database</link> by default. However several companies using Citrix might require their own corporate certificate. On distros with imperative packaging these certs can be stored easily in <link xlink:href="https://developer-docs.citrix.com/projects/receiver-for-linux-command-reference/en/13.7/"><literal>$ICAROOT</literal></link>, however this directory is a store path in <literal>nixpkgs</literal>. In order to work around this issue the package provides a simple mechanism to add custom certificates without rebuilding the entire package using <literal>symlinkJoin</literal>:
-<programlisting>
-<![CDATA[with import <nixpkgs> { config.allowUnfree = true; };
-let extraCerts = [ ./custom-cert-1.pem ./custom-cert-2.pem /* ... */ ]; in
-citrix_workspace.override {
-  inherit extraCerts;
-}]]>
-</programlisting>
-  </para>
- </section>
-</section>
--- a/doc/builders/packages/dlib.xml
+++ b/doc/builders/packages/dlib.xml
@ -1,24 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="dlib">
- <title>DLib</title>
-
- <para>
-  <link xlink:href="http://dlib.net/">DLib</link> is a modern, C++-based toolkit which provides several machine learning algorithms.
- </para>
-
- <section xml:id="compiling-without-avx-support">
-  <title>Compiling without AVX support</title>
-
-  <para>
-   Especially older CPUs don't support <link xlink:href="https://en.wikipedia.org/wiki/Advanced_Vector_Extensions">AVX</link> (<abbrev>Advanced Vector Extensions</abbrev>) instructions that are used by DLib to optimize their algorithms.
-  </para>
-
-  <para>
-   On the affected hardware errors like <literal>Illegal instruction</literal> will occur. In those cases AVX support needs to be disabled:
-<programlisting>self: super: {
-  dlib = super.dlib.override { avxSupport = false; };
-}</programlisting>
-  </para>
- </section>
-</section>
--- a/doc/builders/packages/eclipse.xml
+++ b/doc/builders/packages/eclipse.xml
@ -1,72 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-eclipse">
- <title>Eclipse</title>
-
- <para>
-  The Nix expressions related to the Eclipse platform and IDE are in <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/editors/eclipse"><filename>pkgs/applications/editors/eclipse</filename></link>.
- </para>
-
- <para>
-  Nixpkgs provides a number of packages that will install Eclipse in its various forms. These range from the bare-bones Eclipse Platform to the more fully featured Eclipse SDK or Scala-IDE packages and multiple version are often available. It is possible to list available Eclipse packages by issuing the command:
-<screen>
-<prompt>$ </prompt>nix-env -f '&lt;nixpkgs&gt;' -qaP -A eclipses --description
-</screen>
-  Once an Eclipse variant is installed it can be run using the <command>eclipse</command> command, as expected. From within Eclipse it is then possible to install plugins in the usual manner by either manually specifying an Eclipse update site or by installing the Marketplace Client plugin and using it to discover and install other plugins. This installation method provides an Eclipse installation that closely resemble a manually installed Eclipse.
- </para>
-
- <para>
-  If you prefer to install plugins in a more declarative manner then Nixpkgs also offer a number of Eclipse plugins that can be installed in an <emphasis>Eclipse environment</emphasis>. This type of environment is created using the function <varname>eclipseWithPlugins</varname> found inside the <varname>nixpkgs.eclipses</varname> attribute set. This function takes as argument <literal>{ eclipse, plugins ? [], jvmArgs ? [] }</literal> where <varname>eclipse</varname> is a one of the Eclipse packages described above, <varname>plugins</varname> is a list of plugin derivations, and <varname>jvmArgs</varname> is a list of arguments given to the JVM running the Eclipse. For example, say you wish to install the latest Eclipse Platform with the popular Eclipse Color Theme plugin and also allow Eclipse to use more RAM. You could then add
-<screen>
-packageOverrides = pkgs: {
-  myEclipse = with pkgs.eclipses; eclipseWithPlugins {
-    eclipse = eclipse-platform;
-    jvmArgs = [ "-Xmx2048m" ];
-    plugins = [ plugins.color-theme ];
-  };
-}
-</screen>
-  to your Nixpkgs configuration (<filename>~/.config/nixpkgs/config.nix</filename>) and install it by running <command>nix-env -f '&lt;nixpkgs&gt;' -iA myEclipse</command> and afterward run Eclipse as usual. It is possible to find out which plugins are available for installation using <varname>eclipseWithPlugins</varname> by running
-<screen>
-<prompt>$ </prompt>nix-env -f '&lt;nixpkgs&gt;' -qaP -A eclipses.plugins --description
-</screen>
- </para>
-
- <para>
-  If there is a need to install plugins that are not available in Nixpkgs then it may be possible to define these plugins outside Nixpkgs using the <varname>buildEclipseUpdateSite</varname> and <varname>buildEclipsePlugin</varname> functions found in the <varname>nixpkgs.eclipses.plugins</varname> attribute set. Use the <varname>buildEclipseUpdateSite</varname> function to install a plugin distributed as an Eclipse update site. This function takes <literal>{ name, src }</literal> as argument where <literal>src</literal> indicates the Eclipse update site archive. All Eclipse features and plugins within the downloaded update site will be installed. When an update site archive is not available then the <varname>buildEclipsePlugin</varname> function can be used to install a plugin that consists of a pair of feature and plugin JARs. This function takes an argument <literal>{ name, srcFeature, srcPlugin }</literal> where <literal>srcFeature</literal> and <literal>srcPlugin</literal> are the feature and plugin JARs, respectively.
- </para>
-
- <para>
-  Expanding the previous example with two plugins using the above functions we have
-<screen>
-packageOverrides = pkgs: {
-  myEclipse = with pkgs.eclipses; eclipseWithPlugins {
-    eclipse = eclipse-platform;
-    jvmArgs = [ "-Xmx2048m" ];
-    plugins = [
-      plugins.color-theme
-      (plugins.buildEclipsePlugin {
-        name = "myplugin1-1.0";
-        srcFeature = fetchurl {
-          url = "http://…/features/myplugin1.jar";
-          sha256 = "123…";
-        };
-        srcPlugin = fetchurl {
-          url = "http://…/plugins/myplugin1.jar";
-          sha256 = "123…";
-        };
-      });
-      (plugins.buildEclipseUpdateSite {
-        name = "myplugin2-1.0";
-        src = fetchurl {
-          stripRoot = false;
-          url = "http://…/myplugin2.zip";
-          sha256 = "123…";
-        };
-      });
-    ];
-  };
-}
-</screen>
- </para>
-</section>
--- a/doc/builders/packages/elm.xml
+++ b/doc/builders/packages/elm.xml
@ -1,17 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-elm">
- <title>Elm</title>
-
- <para>
-  To start a development environment do <command>nix-shell -p elmPackages.elm elmPackages.elm-format</command>
- </para>
-
- <para>
-  To update Elm compiler, see <filename>nixpkgs/pkgs/development/compilers/elm/README.md</filename>.
- </para>
-
- <para>
-  To package Elm applications, <link xlink:href="https://github.com/hercules-ci/elm2nix#elm2nix">read about elm2nix</link>.
- </para>
-</section>
--- a/doc/builders/packages/emacs.xml
+++ b/doc/builders/packages/emacs.xml
@ -1,131 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-emacs">
- <title>Emacs</title>
-
- <section xml:id="sec-emacs-config">
-  <title>Configuring Emacs</title>
-
-  <para>
-   The Emacs package comes with some extra helpers to make it easier to configure. <varname>emacsWithPackages</varname> allows you to manage packages from ELPA. This means that you will not have to install that packages from within Emacs. For instance, if you wanted to use <literal>company</literal>, <literal>counsel</literal>, <literal>flycheck</literal>, <literal>ivy</literal>, <literal>magit</literal>, <literal>projectile</literal>, and <literal>use-package</literal> you could use this as a <filename>~/.config/nixpkgs/config.nix</filename> override:
-  </para>
-
-<screen>
-{
-  packageOverrides = pkgs: with pkgs; {
-    myEmacs = emacsWithPackages (epkgs: (with epkgs.melpaStablePackages; [
-      company
-      counsel
-      flycheck
-      ivy
-      magit
-      projectile
-      use-package
-    ]));
-  }
-}
-</screen>
-
-  <para>
-   You can install it like any other packages via <command>nix-env -iA myEmacs</command>. However, this will only install those packages. It will not <literal>configure</literal> them for us. To do this, we need to provide a configuration file. Luckily, it is possible to do this from within Nix! By modifying the above example, we can make Emacs load a custom config file. The key is to create a package that provide a <filename>default.el</filename> file in <filename>/share/emacs/site-start/</filename>. Emacs knows to load this file automatically when it starts.
-  </para>
-
-<screen>
-{
-  packageOverrides = pkgs: with pkgs; rec {
-    myEmacsConfig = writeText "default.el" ''
-;; initialize package
-
-(require 'package)
-(package-initialize 'noactivate)
-(eval-when-compile
-  (require 'use-package))
-
-;; load some packages
-
-(use-package company
-  :bind ("&lt;C-tab&gt;" . company-complete)
-  :diminish company-mode
-  :commands (company-mode global-company-mode)
-  :defer 1
-  :config
-  (global-company-mode))
-
-(use-package counsel
-  :commands (counsel-descbinds)
-  :bind (([remap execute-extended-command] . counsel-M-x)
-         ("C-x C-f" . counsel-find-file)
-         ("C-c g" . counsel-git)
-         ("C-c j" . counsel-git-grep)
-         ("C-c k" . counsel-ag)
-         ("C-x l" . counsel-locate)
-         ("M-y" . counsel-yank-pop)))
-
-(use-package flycheck
-  :defer 2
-  :config (global-flycheck-mode))
-
-(use-package ivy
-  :defer 1
-  :bind (("C-c C-r" . ivy-resume)
-         ("C-x C-b" . ivy-switch-buffer)
-         :map ivy-minibuffer-map
-         ("C-j" . ivy-call))
-  :diminish ivy-mode
-  :commands ivy-mode
-  :config
-  (ivy-mode 1))
-
-(use-package magit
-  :defer
-  :if (executable-find "git")
-  :bind (("C-x g" . magit-status)
-         ("C-x G" . magit-dispatch-popup))
-  :init
-  (setq magit-completing-read-function 'ivy-completing-read))
-
-(use-package projectile
-  :commands projectile-mode
-  :bind-keymap ("C-c p" . projectile-command-map)
-  :defer 5
-  :config
-  (projectile-global-mode))
-    '';
-    myEmacs = emacsWithPackages (epkgs: (with epkgs.melpaStablePackages; [
-      (runCommand "default.el" {} ''
-mkdir -p $out/share/emacs/site-lisp
-cp ${myEmacsConfig} $out/share/emacs/site-lisp/default.el
-'')
-      company
-      counsel
-      flycheck
-      ivy
-      magit
-      projectile
-      use-package
-    ]));
-  };
-}
-</screen>
-
-  <para>
-   This provides a fairly full Emacs start file. It will load in addition to the user's presonal config. You can always disable it by passing <command>-q</command> to the Emacs command.
-  </para>
-
-  <para>
-   Sometimes <varname>emacsWithPackages</varname> is not enough, as this package set has some priorities imposed on packages (with the lowest priority assigned to Melpa Unstable, and the highest for packages manually defined in <filename>pkgs/top-level/emacs-packages.nix</filename>). But you can't control this priorities when some package is installed as a dependency. You can override it on per-package-basis, providing all the required dependencies manually - but it's tedious and there is always a possibility that an unwanted dependency will sneak in through some other package. To completely override such a package you can use <varname>overrideScope'</varname>.
-  </para>
-
-<screen>
-overrides = self: super: rec {
-  haskell-mode = self.melpaPackages.haskell-mode;
-  ...
-};
-((emacsPackagesGen emacs).overrideScope' overrides).emacsWithPackages (p: with p; [
-  # here both these package will use haskell-mode of our own choice
-  ghc-mod
-  dante
-])
-</screen>
- </section>
-</section>
--- a/doc/builders/packages/ibus.xml
+++ b/doc/builders/packages/ibus.xml
@ -1,57 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-ibus-typing-booster">
- <title>ibus-engines.typing-booster</title>
-
- <para>
-  This package is an ibus-based completion method to speed up typing.
- </para>
-
- <section xml:id="sec-ibus-typing-booster-activate">
-  <title>Activating the engine</title>
-
-  <para>
-   IBus needs to be configured accordingly to activate <literal>typing-booster</literal>. The configuration depends on the desktop manager in use. For detailed instructions, please refer to the <link xlink:href="https://mike-fabian.github.io/ibus-typing-booster/documentation.html">upstream docs</link>.
-  </para>
-
-  <para>
-   On NixOS you need to explicitly enable <literal>ibus</literal> with given engines before customizing your desktop to use <literal>typing-booster</literal>. This can be achieved using the <literal>ibus</literal> module:
-<programlisting>{ pkgs, ... }: {
-  i18n.inputMethod = {
-    enabled = "ibus";
-    ibus.engines = with pkgs.ibus-engines; [ typing-booster ];
-  };
-}</programlisting>
-  </para>
- </section>
-
- <section xml:id="sec-ibus-typing-booster-customize-hunspell">
-  <title>Using custom hunspell dictionaries</title>
-
-  <para>
-   The IBus engine is based on <literal>hunspell</literal> to support completion in many languages. By default the dictionaries <literal>de-de</literal>, <literal>en-us</literal>, <literal>fr-moderne</literal> <literal>es-es</literal>, <literal>it-it</literal>, <literal>sv-se</literal> and <literal>sv-fi</literal> are in use. To add another dictionary, the package can be overridden like this:
-<programlisting>ibus-engines.typing-booster.override {
-  langs = [ "de-at" "en-gb" ];
-}</programlisting>
-  </para>
-
-  <para>
-   <emphasis>Note: each language passed to <literal>langs</literal> must be an attribute name in <literal>pkgs.hunspellDicts</literal>.</emphasis>
-  </para>
- </section>
-
- <section xml:id="sec-ibus-typing-booster-emoji-picker">
-  <title>Built-in emoji picker</title>
-
-  <para>
-   The <literal>ibus-engines.typing-booster</literal> package contains a program named <literal>emoji-picker</literal>. To display all emojis correctly, a special font such as <literal>noto-fonts-emoji</literal> is needed:
-  </para>
-
-  <para>
-   On NixOS it can be installed using the following expression:
-<programlisting>{ pkgs, ... }: {
-  fonts.fonts = with pkgs; [ noto-fonts-emoji ];
-}</programlisting>
-  </para>
- </section>
-</section>
--- a/doc/builders/packages/index.xml
+++ b/doc/builders/packages/index.xml
@ -1,24 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-packages">
- <title>Packages</title>
- <para>
-  This chapter contains information about how to use and maintain the Nix expressions for a number of specific packages, such as the Linux kernel or X.org.
- </para>
- <xi:include href="citrix.xml" />
- <xi:include href="dlib.xml" />
- <xi:include href="eclipse.xml" />
- <xi:include href="elm.xml" />
- <xi:include href="emacs.xml" />
- <xi:include href="ibus.xml" />
- <xi:include href="kakoune.xml" />
- <xi:include href="linux.xml" />
- <xi:include href="locales.xml" />
- <xi:include href="nginx.xml" />
- <xi:include href="opengl.xml" />
- <xi:include href="shell-helpers.xml" />
- <xi:include href="steam.xml" />
- <xi:include href="urxvt.xml" />
- <xi:include href="weechat.xml" />
- <xi:include href="xorg.xml" />
-</chapter>
--- a/doc/builders/packages/kakoune.xml
+++ b/doc/builders/packages/kakoune.xml
@ -1,14 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-kakoune">
- <title>Kakoune</title>
-
- <para>
-  Kakoune can be built to autoload plugins:
-<programlisting>(kakoune.override {
-  configure = {
-    plugins = with pkgs.kakounePlugins; [ parinfer-rust ];
-  };
-})</programlisting>
- </para>
-</section>
--- a/doc/builders/packages/linux.xml
+++ b/doc/builders/packages/linux.xml
@ -1,85 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-linux-kernel">
- <title>Linux kernel</title>
-
- <para>
-  The Nix expressions to build the Linux kernel are in <link
-xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/os-specific/linux/kernel"><filename>pkgs/os-specific/linux/kernel</filename></link>.
- </para>
-
- <para>
-  The function that builds the kernel has an argument <varname>kernelPatches</varname> which should be a list of <literal>{name, patch, extraConfig}</literal> attribute sets, where <varname>name</varname> is the name of the patch (which is included in the kernel’s <varname>meta.description</varname> attribute), <varname>patch</varname> is the patch itself (possibly compressed), and <varname>extraConfig</varname> (optional) is a string specifying extra options to be concatenated to the kernel configuration file (<filename>.config</filename>).
- </para>
-
- <para>
-  The kernel derivation exports an attribute <varname>features</varname> specifying whether optional functionality is or isn’t enabled. This is used in NixOS to implement kernel-specific behaviour. For instance, if the kernel has the <varname>iwlwifi</varname> feature (i.e. has built-in support for Intel wireless chipsets), then NixOS doesn’t have to build the external <varname>iwlwifi</varname> package:
-<programlisting>
-modulesTree = [kernel]
-  ++ pkgs.lib.optional (!kernel.features ? iwlwifi) kernelPackages.iwlwifi
-  ++ ...;
-</programlisting>
- </para>
-
- <para>
-  How to add a new (major) version of the Linux kernel to Nixpkgs:
-  <orderedlist>
-   <listitem>
-    <para>
-     Copy the old Nix expression (e.g. <filename>linux-2.6.21.nix</filename>) to the new one (e.g. <filename>linux-2.6.22.nix</filename>) and update it.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Add the new kernel to <filename>all-packages.nix</filename> (e.g., create an attribute <varname>kernel_2_6_22</varname>).
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Now we’re going to update the kernel configuration. First unpack the kernel. Then for each supported platform (<literal>i686</literal>, <literal>x86_64</literal>, <literal>uml</literal>) do the following:
-     <orderedlist>
-      <listitem>
-       <para>
-        Make an copy from the old config (e.g. <filename>config-2.6.21-i686-smp</filename>) to the new one (e.g. <filename>config-2.6.22-i686-smp</filename>).
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Copy the config file for this platform (e.g. <filename>config-2.6.22-i686-smp</filename>) to <filename>.config</filename> in the kernel source tree.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Run <literal>make oldconfig ARCH=<replaceable>{i386,x86_64,um}</replaceable></literal> and answer all questions. (For the uml configuration, also add <literal>SHELL=bash</literal>.) Make sure to keep the configuration consistent between platforms (i.e. don’t enable some feature on <literal>i686</literal> and disable it on <literal>x86_64</literal>).
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        If needed you can also run <literal>make menuconfig</literal>:
-<screen>
-<prompt>$ </prompt>nix-env -i ncurses
-<prompt>$ </prompt>export NIX_CFLAGS_LINK=-lncurses
-<prompt>$ </prompt>make menuconfig ARCH=<replaceable>arch</replaceable></screen>
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Copy <filename>.config</filename> over the new config file (e.g. <filename>config-2.6.22-i686-smp</filename>).
-       </para>
-      </listitem>
-     </orderedlist>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Test building the kernel: <literal>nix-build -A kernel_2_6_22</literal>. If it compiles, ship it! For extra credit, try booting NixOS with it.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     It may be that the new kernel requires updating the external kernel modules and kernel-dependent packages listed in the <varname>linuxPackagesFor</varname> function in <filename>all-packages.nix</filename> (such as the NVIDIA drivers, AUFS, etc.). If the updated packages aren’t backwards compatible with older kernels, you may need to keep the older versions around.
-    </para>
-   </listitem>
-  </orderedlist>
- </para>
-</section>
--- a/doc/builders/packages/locales.xml
+++ b/doc/builders/packages/locales.xml
@ -1,13 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="locales">
- <title>Locales</title>
-
- <para>
-  To allow simultaneous use of packages linked against different versions of <literal>glibc</literal> with different locale archive formats Nixpkgs patches <literal>glibc</literal> to rely on <literal>LOCALE_ARCHIVE</literal> environment variable.
- </para>
-
- <para>
-  On non-NixOS distributions this variable is obviously not set. This can cause regressions in language support or even crashes in some Nixpkgs-provided programs. The simplest way to mitigate this problem is exporting the <literal>LOCALE_ARCHIVE</literal> variable pointing to <literal>${glibcLocales}/lib/locale/locale-archive</literal>. The drawback (and the reason this is not the default) is the relatively large (a hundred MiB) size of the full set of locales. It is possible to build a custom set of locales by overriding parameters <literal>allLocales</literal> and <literal>locales</literal> of the package.
- </para>
-</section>
--- a/doc/builders/packages/nginx.xml
+++ b/doc/builders/packages/nginx.xml
@ -1,25 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-nginx">
- <title>Nginx</title>
-
- <para>
-  <link xlink:href="https://nginx.org/">Nginx</link> is a reverse proxy and lightweight webserver.
- </para>
-
- <section xml:id="sec-nginx-etag">
-  <title>ETags on static files served from the Nix store</title>
-
-  <para>
-   HTTP has a couple different mechanisms for caching to prevent clients from having to download the same content repeatedly if a resource has not changed since the last time it was requested. When nginx is used as a server for static files, it implements the caching mechanism based on the <link xlink:href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Last-Modified"><literal>Last-Modified</literal></link> response header automatically; unfortunately, it works by using filesystem timestamps to determine the value of the <literal>Last-Modified</literal> header. This doesn't give the desired behavior when the file is in the Nix store, because all file timestamps are set to 0 (for reasons related to build reproducibility).
-  </para>
-
-  <para>
-   Fortunately, HTTP supports an alternative (and more effective) caching mechanism: the <link xlink:href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag"><literal>ETag</literal></link> response header. The value of the <literal>ETag</literal> header specifies some identifier for the particular content that the server is sending (e.g. a hash). When a client makes a second request for the same resource, it sends that value back in an <literal>If-None-Match</literal> header. If the ETag value is unchanged, then the server does not need to resend the content.
-  </para>
-
-  <para>
-   As of NixOS 19.09, the nginx package in Nixpkgs is patched such that when nginx serves a file out of <filename>/nix/store</filename>, the hash in the store path is used as the <literal>ETag</literal> header in the HTTP response, thus providing proper caching functionality. This happens automatically; you do not need to do modify any configuration to get this behavior.
-  </para>
- </section>
-</section>
--- a/doc/builders/packages/opengl.xml
+++ b/doc/builders/packages/opengl.xml
@ -1,9 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-opengl">
- <title>OpenGL</title>
-
- <para>
-  Packages that use OpenGL have NixOS desktop as their primary target. The current solution for loading the GPU-specific drivers is based on <literal>libglvnd</literal> and looks for the driver implementation in <literal>LD_LIBRARY_PATH</literal>. If you are using a non-NixOS GNU/Linux/X11 desktop with free software video drivers, consider launching OpenGL-dependent programs from Nixpkgs with Nixpkgs versions of <literal>libglvnd</literal> and <literal>mesa_drivers</literal> in <literal>LD_LIBRARY_PATH</literal>. For proprietary video drivers you might have luck with also adding the corresponding video driver package.
- </para>
-</section>
--- a/doc/builders/packages/shell-helpers.xml
+++ b/doc/builders/packages/shell-helpers.xml
@ -1,25 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-shell-helpers">
- <title>Interactive shell helpers</title>
-
- <para>
-  Some packages provide the shell integration to be more useful. But unlike other systems, nix doesn't have a standard share directory location. This is why a bunch <command>PACKAGE-share</command> scripts are shipped that print the location of the corresponding shared folder. Current list of such packages is as following:
-  <itemizedlist>
-   <listitem>
-    <para>
-     <literal>autojump</literal>: <command>autojump-share</command>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     <literal>fzf</literal>: <command>fzf-share</command>
-    </para>
-   </listitem>
-  </itemizedlist>
-  E.g. <literal>autojump</literal> can then used in the .bashrc like this:
-<screen>
-  source "$(autojump-share)/autojump.bash"
-</screen>
- </para>
-</section>
--- a/doc/builders/packages/steam.xml
+++ b/doc/builders/packages/steam.xml
@ -1,131 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-steam">
- <title>Steam</title>
-
- <section xml:id="sec-steam-nix">
-  <title>Steam in Nix</title>
-
-  <para>
-   Steam is distributed as a <filename>.deb</filename> file, for now only as an i686 package (the amd64 package only has documentation). When unpacked, it has a script called <filename>steam</filename> that in Ubuntu (their target distro) would go to <filename>/usr/bin </filename>. When run for the first time, this script copies some files to the user's home, which include another script that is the ultimate responsible for launching the steam binary, which is also in $HOME.
-  </para>
-
-  <para>
-   Nix problems and constraints:
-   <itemizedlist>
-    <listitem>
-     <para>
-      We don't have <filename>/bin/bash</filename> and many scripts point there. Similarly for <filename>/usr/bin/python</filename> .
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      We don't have the dynamic loader in <filename>/lib </filename>.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      The <filename>steam.sh</filename> script in $HOME can not be patched, as it is checked and rewritten by steam.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      The steam binary cannot be patched, it's also checked.
-     </para>
-    </listitem>
-   </itemizedlist>
-  </para>
-
-  <para>
-   The current approach to deploy Steam in NixOS is composing a FHS-compatible chroot environment, as documented <link xlink:href="http://sandervanderburg.blogspot.nl/2013/09/composing-fhs-compatible-chroot.html">here</link>. This allows us to have binaries in the expected paths without disrupting the system, and to avoid patching them to work in a non FHS environment.
-  </para>
- </section>
-
- <section xml:id="sec-steam-play">
-  <title>How to play</title>
-
-  <para>
-   For 64-bit systems it's important to have
-<programlisting>hardware.opengl.driSupport32Bit = true;</programlisting>
-   in your <filename>/etc/nixos/configuration.nix</filename>. You'll also need
-<programlisting>hardware.pulseaudio.support32Bit = true;</programlisting>
-   if you are using PulseAudio - this will enable 32bit ALSA apps integration. To use the Steam controller or other Steam supported controllers such as the DualShock 4 or Nintendo Switch Pro, you need to add
-<programlisting>hardware.steam-hardware.enable = true;</programlisting>
-   to your configuration.
-  </para>
- </section>
-
- <section xml:id="sec-steam-troub">
-  <title>Troubleshooting</title>
-
-  <para>
-   <variablelist>
-    <varlistentry>
-     <term>
-      Steam fails to start. What do I do?
-     </term>
-     <listitem>
-      <para>
-       Try to run
-<programlisting>strace steam</programlisting>
-       to see what is causing steam to fail.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      Using the FOSS Radeon or nouveau (nvidia) drivers
-     </term>
-     <listitem>
-      <itemizedlist>
-       <listitem>
-        <para>
-         The <literal>newStdcpp</literal> parameter was removed since NixOS 17.09 and should not be needed anymore.
-        </para>
-       </listitem>
-       <listitem>
-        <para>
-         Steam ships statically linked with a version of libcrypto that conflics with the one dynamically loaded by radeonsi_dri.so. If you get the error
-<programlisting>steam.sh: line 713: 7842 Segmentation fault (core dumped)</programlisting>
-         have a look at <link xlink:href="https://github.com/NixOS/nixpkgs/pull/20269">this pull request</link>.
-        </para>
-       </listitem>
-      </itemizedlist>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      Java
-     </term>
-     <listitem>
-      <orderedlist>
-       <listitem>
-        <para>
-         There is no java in steam chrootenv by default. If you get a message like
-<programlisting>/home/foo/.local/share/Steam/SteamApps/common/towns/towns.sh: line 1: java: command not found</programlisting>
-         You need to add
-<programlisting> steam.override { withJava = true; };</programlisting>
-         to your configuration.
-        </para>
-       </listitem>
-      </orderedlist>
-     </listitem>
-    </varlistentry>
-   </variablelist>
-  </para>
- </section>
-
- <section xml:id="sec-steam-run">
-  <title>steam-run</title>
-
-  <para>
-   The FHS-compatible chroot used for steam can also be used to run other linux games that expect a FHS environment. To do it, add
-<programlisting>pkgs.(steam.override {
-          nativeOnly = true;
-          newStdcpp = true;
-        }).run</programlisting>
-   to your configuration, rebuild, and run the game with
-<programlisting>steam-run ./foo</programlisting>
-  </para>
- </section>
-</section>
--- a/doc/builders/packages/unfree.xml
+++ b/doc/builders/packages/unfree.xml
@ -1,13 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="unfree-software">
- <title>Unfree software</title>
-
- <para>
-  All users of Nixpkgs are free software users, and many users (and developers) of Nixpkgs want to limit and tightly control their exposure to unfree software. At the same time, many users need (or want) to run some specific pieces of proprietary software. Nixpkgs includes some expressions for unfree software packages. By default unfree software cannot be installed and doesn’t show up in searches. To allow installing unfree software in a single Nix invocation one can export <literal>NIXPKGS_ALLOW_UNFREE=1</literal>. For a persistent solution, users can set <literal>allowUnfree</literal> in the Nixpkgs configuration.
- </para>
-
- <para>
-  Fine-grained control is possible by defining <literal>allowUnfreePredicate</literal> function in config; it takes the <literal>mkDerivation</literal> parameter attrset and returns <literal>true</literal> for unfree packages that should be allowed.
- </para>
-</section>
--- a/doc/builders/packages/urxvt.xml
+++ b/doc/builders/packages/urxvt.xml
@ -1,101 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-urxvt">
- <title>Urxvt</title>
-
- <para>
-  Urxvt, also known as rxvt-unicode, is a highly customizable terminal emulator.
- </para>
-
- <section xml:id="sec-urxvt-conf">
-
-  <title>Configuring urxvt</title>
-
-  <para>
-   In <literal>nixpkgs</literal>, urxvt is provided by the package
-   <literal>rxvt-unicode</literal>. It can be configured to include your choice
-   of plugins, reducing its closure size from the default configuration which
-   includes all available plugins. To make use of this functionality, use an
-   overlay or directly install an expression that overrides its configuration,
-   such as
-   <programlisting>rxvt-unicode.override { configure = { availablePlugins, ... }: {
-    plugins = with availablePlugins; [ perls resize-font vtwheel ];
-  }
-}</programlisting>
-   If the <literal>configure</literal> function returns an attrset without the
-   <literal>plugins</literal> attribute, <literal>availablePlugins</literal>
-   will be used automatically.
-  </para>
-
-  <para>
-   In order to add plugins but also keep all default plugins installed, it is
-   possible to use the following method:
-   <programlisting>rxvt-unicode.override { configure = { availablePlugins, ... }: {
-     plugins = (builtins.attrValues availablePlugins) ++ [ custom-plugin ];
-   };
-}</programlisting>
-  </para>
-
-  <para>
-   To get a list of all the plugins available, open the Nix REPL and run
-   <programlisting>$ nix repl
-:l &lt;nixpkgs&gt;
-map (p: p.name) pkgs.rxvt-unicode.plugins
-   </programlisting>
-   Alternatively, if your shell is bash or zsh and have completion enabled,
-   simply type <literal>nixpkgs.rxvt-unicode.plugins.&lt;tab&gt;</literal>.
-  </para>
-
-  <para>
-    In addition to <literal>plugins</literal> the options
-    <literal>extraDeps</literal> and <literal>perlDeps</literal> can be used
-    to install extra packages.
-    <literal>extraDeps</literal> can be used, for example, to provide 
-    <literal>xsel</literal> (a clipboard manager) to the clipboard plugin,
-    without installing it globally:
-    <programlisting>rxvt-unicode.override { configure = { availablePlugins, ... }: {
-     pluginsDeps = [ xsel ];
-   }
-}</programlisting>
-
-    <literal>perlDeps</literal> is a handy way to provide Perl packages to
-    your custom plugins (in <literal>$HOME/.urxvt/ext</literal>). For example,
-    if you need <literal>AnyEvent</literal> you can do:
-    <programlisting>rxvt-unicode.override { configure = { availablePlugins, ... }: {
-     perlDeps = with perlPackages; [ AnyEvent ];
-   }
-}</programlisting>
-  </para>
-
- </section>
-
- <section xml:id="sec-urxvt-pkg">
-
-  <title>Packaging urxvt plugins</title>
-
-  <para>
-   Urxvt plugins resides in
-   <literal>pkgs/applications/misc/rxvt-unicode-plugins</literal>.
-   To add a new plugin create an expression in a subdirectory and add the
-   package to the set in
-   <literal>pkgs/applications/misc/rxvt-unicode-plugins/default.nix</literal>.
-  </para>
-
-  <para>
-   A plugin can be any kind of derivation, the only requirement is that it
-   should always install perl scripts in <literal>$out/lib/urxvt/perl</literal>.
-   Look for existing plugins for examples.
-  </para>
-
-  <para>
-   If the plugin is itself a perl package that needs to be imported from
-   other plugins or scripts, add the following passthrough:
-   <programlisting>passthru.perlPackages = [ "self" ];
-</programlisting>
-   This will make the urxvt wrapper pick up the dependency and set up the perl
-   path accordingly.
-  </para>
-
- </section>
-
-</section>
--- a/doc/builders/packages/weechat.xml
+++ b/doc/builders/packages/weechat.xml
@ -1,85 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-weechat">
- <title>Weechat</title>
-
- <para>
-  Weechat can be configured to include your choice of plugins, reducing its closure size from the default configuration which includes all available plugins. To make use of this functionality, install an expression that overrides its configuration such as
-<programlisting>weechat.override {configure = {availablePlugins, ...}: {
-    plugins = with availablePlugins; [ python perl ];
-  }
-}</programlisting>
-  If the <literal>configure</literal> function returns an attrset without the <literal>plugins</literal> attribute, <literal>availablePlugins</literal> will be used automatically.
- </para>
-
- <para>
-  The plugins currently available are <literal>python</literal>, <literal>perl</literal>, <literal>ruby</literal>, <literal>guile</literal>, <literal>tcl</literal> and <literal>lua</literal>.
- </para>
-
- <para>
-  The python and perl plugins allows the addition of extra libraries. For instance, the <literal>inotify.py</literal> script in weechat-scripts requires D-Bus or libnotify, and the <literal>fish.py</literal> script requires pycrypto. To use these scripts, use the plugin's <literal>withPackages</literal> attribute:
-<programlisting>weechat.override { configure = {availablePlugins, ...}: {
-    plugins = with availablePlugins; [
-            (python.withPackages (ps: with ps; [ pycrypto python-dbus ]))
-        ];
-    };
-}
-</programlisting>
- </para>
-
- <para>
-  In order to also keep all default plugins installed, it is possible to use the following method:
-<programlisting>weechat.override { configure = { availablePlugins, ... }: {
-  plugins = builtins.attrValues (availablePlugins // {
-    python = availablePlugins.python.withPackages (ps: with ps; [ pycrypto python-dbus ]);
-  });
-}; }
-</programlisting>
- </para>
-
- <para>
-  WeeChat allows to set defaults on startup using the <literal>--run-command</literal>. The <literal>configure</literal> method can be used to pass commands to the program:
-<programlisting>weechat.override {
-  configure = { availablePlugins, ... }: {
-    init = ''
-      /set foo bar
-      /server add freenode chat.freenode.org
-    '';
-  };
-}</programlisting>
-  Further values can be added to the list of commands when running <literal>weechat --run-command "your-commands"</literal>.
- </para>
-
- <para>
-  Additionally it's possible to specify scripts to be loaded when starting <literal>weechat</literal>. These will be loaded before the commands from <literal>init</literal>:
-<programlisting>weechat.override {
-  configure = { availablePlugins, ... }: {
-    scripts = with pkgs.weechatScripts; [
-      weechat-xmpp weechat-matrix-bridge wee-slack
-    ];
-    init = ''
-      /set plugins.var.python.jabber.key "val"
-    '':
-  };
-}</programlisting>
- </para>
-
- <para>
-  In <literal>nixpkgs</literal> there's a subpackage which contains derivations for WeeChat scripts. Such derivations expect a <literal>passthru.scripts</literal> attribute which contains a list of all scripts inside the store path. Furthermore all scripts have to live in <literal>$out/share</literal>. An exemplary derivation looks like this:
-<programlisting>{ stdenv, fetchurl }:
-
-stdenv.mkDerivation {
-  name = "exemplary-weechat-script";
-  src = fetchurl {
-    url = "https://scripts.tld/your-scripts.tar.gz";
-    sha256 = "...";
-  };
-  passthru.scripts = [ "foo.py" "bar.lua" ];
-  installPhase = ''
-    mkdir $out/share
-    cp foo.py $out/share
-    cp bar.lua $out/share
-  '';
-}</programlisting>
- </para>
-</section>
--- a/doc/builders/packages/xorg.xml
+++ b/doc/builders/packages/xorg.xml
@ -1,34 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-xorg">
- <title>X.org</title>
-
- <para>
-  The Nix expressions for the X.org packages reside in <filename>pkgs/servers/x11/xorg/default.nix</filename>. This file is automatically generated from lists of tarballs in an X.org release. As such it should not be modified directly; rather, you should modify the lists, the generator script or the file <filename>pkgs/servers/x11/xorg/overrides.nix</filename>, in which you can override or add to the derivations produced by the generator.
- </para>
-
- <para>
-  The generator is invoked as follows:
-<screen>
-<prompt>$ </prompt>cd pkgs/servers/x11/xorg
-<prompt>$ </prompt>cat tarballs-7.5.list extra.list old.list \
-  | perl ./generate-expr-from-tarballs.pl
-</screen>
-  For each of the tarballs in the <filename>.list</filename> files, the script downloads it, unpacks it, and searches its <filename>configure.ac</filename> and <filename>*.pc.in</filename> files for dependencies. This information is used to generate <filename>default.nix</filename>. The generator caches downloaded tarballs between runs. Pay close attention to the <literal>NOT FOUND: <replaceable>name</replaceable></literal> messages at the end of the run, since they may indicate missing dependencies. (Some might be optional dependencies, however.)
- </para>
-
- <para>
-  A file like <filename>tarballs-7.5.list</filename> contains all tarballs in a X.org release. It can be generated like this:
-<screen>
-<prompt>$ </prompt>export i="mirror://xorg/X11R7.4/src/everything/"
-<prompt>$ </prompt>cat $(PRINT_PATH=1 nix-prefetch-url $i | tail -n 1) \
-  | perl -e 'while (&lt;>) { if (/(href|HREF)="([^"]*.bz2)"/) { print "$ENV{'i'}$2\n"; }; }' \
-  | sort > tarballs-7.4.list
-</screen>
-  <filename>extra.list</filename> contains libraries that aren’t part of X.org proper, but are closely related to it, such as <literal>libxcb</literal>. <filename>old.list</filename> contains some packages that were removed from X.org, but are still needed by some people or by other packages (such as <varname>imake</varname>).
- </para>
-
- <para>
-  If the expression for a package requires derivation attributes that the generator cannot figure out automatically (say, <varname>patches</varname> or a <varname>postInstall</varname> hook), you should modify <filename>pkgs/servers/x11/xorg/overrides.nix</filename>.
- </para>
-</section>
--- a/doc/builders/special.xml
+++ b/doc/builders/special.xml
@ -1,10 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-special">
- <title>Special builders</title>
- <para>
-  This chapter describes several special builders.
- </para>
- <xi:include href="special/fhs-environments.xml" />
- <xi:include href="special/mkshell.xml" />
-</chapter>
--- a/doc/builders/special/fhs-environments.xml
+++ b/doc/builders/special/fhs-environments.xml
@ -1,122 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-fhs-environments">
- <title>buildFHSUserEnv</title>
-
- <para>
-  <function>buildFHSUserEnv</function> provides a way to build and run FHS-compatible lightweight sandboxes. It creates an isolated root with bound <filename>/nix/store</filename>, so its footprint in terms of disk space needed is quite small. This allows one to run software which is hard or unfeasible to patch for NixOS -- 3rd-party source trees with FHS assumptions, games distributed as tarballs, software with integrity checking and/or external self-updated binaries. It uses Linux namespaces feature to create temporary lightweight environments which are destroyed after all child processes exit, without root user rights requirement. Accepted arguments are:
- </para>
-
- <variablelist>
-  <varlistentry>
-   <term>
-    <literal>name</literal>
-   </term>
-   <listitem>
-    <para>
-     Environment name.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>targetPkgs</literal>
-   </term>
-   <listitem>
-    <para>
-     Packages to be installed for the main host's architecture (i.e. x86_64 on x86_64 installations). Along with libraries binaries are also installed.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>multiPkgs</literal>
-   </term>
-   <listitem>
-    <para>
-     Packages to be installed for all architectures supported by a host (i.e. i686 and x86_64 on x86_64 installations). Only libraries are installed by default.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraBuildCommands</literal>
-   </term>
-   <listitem>
-    <para>
-     Additional commands to be executed for finalizing the directory structure.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraBuildCommandsMulti</literal>
-   </term>
-   <listitem>
-    <para>
-     Like <literal>extraBuildCommands</literal>, but executed only on multilib architectures.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraOutputsToInstall</literal>
-   </term>
-   <listitem>
-    <para>
-     Additional derivation outputs to be linked for both target and multi-architecture packages.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>extraInstallCommands</literal>
-   </term>
-   <listitem>
-    <para>
-     Additional commands to be executed for finalizing the derivation with runner script.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry>
-   <term>
-    <literal>runScript</literal>
-   </term>
-   <listitem>
-    <para>
-     A command that would be executed inside the sandbox and passed all the command line arguments. It defaults to <literal>bash</literal>.
-    </para>
-   </listitem>
-  </varlistentry>
- </variablelist>
-
- <para>
-  One can create a simple environment using a <literal>shell.nix</literal> like that:
- </para>
-
-<programlisting><![CDATA[
-{ pkgs ? import <nixpkgs> {} }:
-
-(pkgs.buildFHSUserEnv {
-  name = "simple-x11-env";
-  targetPkgs = pkgs: (with pkgs;
-    [ udev
-      alsaLib
-    ]) ++ (with pkgs.xorg;
-    [ libX11
-      libXcursor
-      libXrandr
-    ]);
-  multiPkgs = pkgs: (with pkgs;
-    [ udev
-      alsaLib
-    ]);
-  runScript = "bash";
-}).env
-]]></programlisting>
-
- <para>
-  Running <literal>nix-shell</literal> would then drop you into a shell with these libraries and binaries available. You can use this to run closed-source applications which expect FHS structure without hassles: simply change <literal>runScript</literal> to the application path, e.g. <filename>./bin/start.sh</filename> -- relative paths are supported.
- </para>
-</section>
--- a/doc/builders/special/mkshell.xml
+++ b/doc/builders/special/mkshell.xml
@ -1,24 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-pkgs-mkShell">
- <title>pkgs.mkShell</title>
-
- <para>
-  <function>pkgs.mkShell</function> is a special kind of derivation that is only useful when using it combined with <command>nix-shell</command>. It will in fact fail to instantiate when invoked with <command>nix-build</command>.
- </para>
-
- <section xml:id="sec-pkgs-mkShell-usage">
-  <title>Usage</title>
-
-<programlisting><![CDATA[
-{ pkgs ? import <nixpkgs> {} }:
-pkgs.mkShell {
-  # this will make all the build inputs from hello and gnutar
-  # available to the shell environment
-  inputsFrom = with pkgs; [ hello gnutar ];
-  buildInputs = [ pkgs.gnumake ];
-}
-]]></programlisting>
- </section>
-</section>
--- a/doc/builders/trivial-builders.xml
+++ b/doc/builders/trivial-builders.xml
@ -1,90 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-trivial-builders">
- <title>Trivial builders</title>
- <para>
-  Nixpkgs provides a couple of functions that help with building derivations. The most important one, <function>stdenv.mkDerivation</function>, has already been documented above. The following functions wrap <function>stdenv.mkDerivation</function>, making it easier to use in certain cases.
- </para>
- <variablelist>
-  <varlistentry xml:id="trivial-builder-runCommand">
-   <term>
-    <literal>runCommand</literal>
-   </term>
-   <listitem>
-    <para>
-     This takes three arguments, <literal>name</literal>, <literal>env</literal>, and <literal>buildCommand</literal>. <literal>name</literal> is just the name that Nix will append to the store path in the same way that <literal>stdenv.mkDerivation</literal> uses its <literal>name</literal> attribute. <literal>env</literal> is an attribute set specifying environment variables that will be set for this derivation. These attributes are then passed to the wrapped <literal>stdenv.mkDerivation</literal>. <literal>buildCommand</literal> specifies the commands that will be run to create this derivation. Note that you will need to create <literal>$out</literal> for Nix to register the command as successful.
-    </para>
-    <para>
-     An example of using <literal>runCommand</literal> is provided below.
-    </para>
-<programlisting>
-(import &lt;nixpkgs&gt; {}).runCommand "my-example" {} ''
-  echo My example command is running
-
-  mkdir $out
-
-  echo I can write data to the Nix store > $out/message
-
-  echo I can also run basic commands like:
-
-  echo ls
-  ls
-
-  echo whoami
-  whoami
-
-  echo date
-  date
-''
-</programlisting>
-   </listitem>
-  </varlistentry>
-  <varlistentry xml:id="trivial-builder-runCommandCC">
-   <term>
-    <literal>runCommandCC</literal>
-   </term>
-   <listitem>
-    <para>
-     This works just like <literal>runCommand</literal>. The only difference is that it also provides a C compiler in <literal>buildCommand</literal>’s environment. To minimize your dependencies, you should only use this if you are sure you will need a C compiler as part of running your command.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry xml:id="trivial-builder-runCommandLocal">
-   <term>
-    <literal>runCommandLocal</literal>
-   </term>
-   <listitem>
-    <para>
-     Variant of <literal>runCommand</literal> that forces the derivation to be built locally, it is not substituted. This is intended for very cheap commands (&lt;1s execution time). It saves on the network roundrip and can speed up a build.
-    </para>
-    <note><para>
-      This sets <link xlink:href="https://nixos.org/nix/manual/#adv-attr-allowSubstitutes"><literal>allowSubstitutes</literal> to <literal>false</literal></link>, so only use <literal>runCommandLocal</literal> if you are certain the user will always have a builder for the <literal>system</literal> of the derivation. This should be true for most trivial use cases (e.g. just copying some files to a different location or adding symlinks), because there the <literal>system</literal> is usually the same as <literal>builtins.currentSystem</literal>.
-    </para></note>
-   </listitem>
-  </varlistentry>
-  <varlistentry xml:id="trivial-builder-writeText">
-   <term>
-    <literal>writeTextFile</literal>, <literal>writeText</literal>, <literal>writeTextDir</literal>, <literal>writeScript</literal>, <literal>writeScriptBin</literal>
-   </term>
-   <listitem>
-    <para>
-     These functions write <literal>text</literal> to the Nix store. This is useful for creating scripts from Nix expressions. <literal>writeTextFile</literal> takes an attribute set and expects two arguments, <literal>name</literal> and <literal>text</literal>. <literal>name</literal> corresponds to the name used in the Nix store path. <literal>text</literal> will be the contents of the file. You can also set <literal>executable</literal> to true to make this file have the executable bit set.
-    </para>
-    <para>
-     Many more commands wrap <literal>writeTextFile</literal> including <literal>writeText</literal>, <literal>writeTextDir</literal>, <literal>writeScript</literal>, and <literal>writeScriptBin</literal>. These are convenience functions over <literal>writeTextFile</literal>.
-    </para>
-   </listitem>
-  </varlistentry>
-  <varlistentry xml:id="trivial-builder-symlinkJoin">
-   <term>
-    <literal>symlinkJoin</literal>
-   </term>
-   <listitem>
-    <para>
-     This can be used to put many derivations into the same directory structure. It works by creating a new derivation and adding symlinks to each of the paths listed. It expects two arguments, <literal>name</literal>, and <literal>paths</literal>. <literal>name</literal> is the name used in the Nix store path for the created derivation. <literal>paths</literal> is a list of paths that will be symlinked. These paths can be to Nix store derivations or any other subdirectory contained within.
-    </para>
-   </listitem>
-  </varlistentry>
- </variablelist>
-</chapter>
--- a/doc/coding-conventions.xml
+++ b/doc/coding-conventions.xml
@ -0,0 +1,603 @@
+<chapter xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xml:id="chap-conventions">
+
+<title>Coding conventions</title>
+
+
+<section><title>Syntax</title>
+
+<itemizedlist>
+
+  <listitem><para>Use 2 spaces of indentation per indentation level in
+  Nix expressions, 4 spaces in shell scripts.</para></listitem>
+
+  <listitem><para>Do not use tab characters, i.e. configure your
+  editor to use soft tabs.  For instance, use <literal>(setq-default
+  indent-tabs-mode nil)</literal> in Emacs.  Everybody has different
+  tab settings so it’s asking for trouble.</para></listitem>
+
+  <listitem><para>Use <literal>lowerCamelCase</literal> for variable
+  names, not <literal>UpperCamelCase</literal>.  TODO: naming of
+  attributes in
+  <filename>all-packages.nix</filename>?</para></listitem>
+
+  <listitem><para>Function calls with attribute set arguments are
+  written as
+
+<programlisting>
+foo {
+  arg = ...;
+}
+</programlisting>
+
+  not
+
+<programlisting>
+foo
+{
+  arg = ...;
+}
+</programlisting>
+
+  Also fine is
+
+<programlisting>
+foo { arg = ...; }
+</programlisting>
+
+  if it's a short call.</para></listitem>
+
+  <listitem><para>In attribute sets or lists that span multiple lines,
+  the attribute names or list elements should be aligned:
+
+<programlisting>
+# A long list.
+list =
+  [ elem1
+    elem2
+    elem3
+  ];
+
+# A long attribute set.
+attrs =
+  { attr1 = short_expr;
+    attr2 =
+      if true then big_expr else big_expr;
+  };
+
+# Alternatively:
+attrs = {
+  attr1 = short_expr;
+  attr2 =
+    if true then big_expr else big_expr;
+};
+</programlisting>
+
+  </para></listitem>
+
+  <listitem><para>Short lists or attribute sets can be written on one
+  line:
+
+<programlisting>
+# A short list.
+list = [ elem1 elem2 elem3 ];
+
+# A short set.
+attrs = { x = 1280; y = 1024; };
+</programlisting>
+
+  </para></listitem>
+
+  <listitem><para>Breaking in the middle of a function argument can
+  give hard-to-read code, like
+
+<programlisting>
+someFunction { x = 1280;
+  y = 1024; } otherArg
+  yetAnotherArg
+</programlisting>
+
+  (especially if the argument is very large, spanning multiple
+  lines).</para>
+
+  <para>Better:
+
+<programlisting>
+someFunction
+  { x = 1280; y = 1024; }
+  otherArg
+  yetAnotherArg
+</programlisting>
+
+  or
+
+<programlisting>
+let res = { x = 1280; y = 1024; };
+in someFunction res otherArg yetAnotherArg
+</programlisting>
+
+  </para></listitem>
+
+  <listitem><para>The bodies of functions, asserts, and withs are not
+  indented to prevent a lot of superfluous indentation levels, i.e.
+
+<programlisting>
+{ arg1, arg2 }:
+assert system == "i686-linux";
+stdenv.mkDerivation { ...
+</programlisting>
+
+  not
+
+<programlisting>
+{ arg1, arg2 }:
+  assert system == "i686-linux";
+    stdenv.mkDerivation { ...
+</programlisting>
+
+  </para></listitem>
+
+  <listitem><para>Function formal arguments are written as:
+
+<programlisting>
+{ arg1, arg2, arg3 }:
+</programlisting>
+
+  but if they don't fit on one line they're written as:
+
+<programlisting>
+{ arg1, arg2, arg3
+, arg4, ...
+, # Some comment...
+  argN
+}:
+</programlisting>
+
+  </para></listitem>
+
+  <listitem><para>Functions should list their expected arguments as
+  precisely as possible.  That is, write
+
+<programlisting>
+{ stdenv, fetchurl, perl }: <replaceable>...</replaceable>
+</programlisting>
+
+  instead of
+
+<programlisting>
+args: with args; <replaceable>...</replaceable>
+</programlisting>
+
+  or 
+  
+<programlisting>
+{ stdenv, fetchurl, perl, ... }: <replaceable>...</replaceable>
+</programlisting>
+
+  </para>
+
+  <para>For functions that are truly generic in the number of
+  arguments (such as wrappers around <varname>mkDerivation</varname>)
+  that have some required arguments, you should write them using an
+  <literal>@</literal>-pattern:
+
+<programlisting>
+{ stdenv, doCoverageAnalysis ? false, ... } @ args:
+
+stdenv.mkDerivation (args // {
+  <replaceable>...</replaceable> if doCoverageAnalysis then "bla" else "" <replaceable>...</replaceable>
+})
+</programlisting>
+
+  instead of
+
+<programlisting>
+args:
+
+args.stdenv.mkDerivation (args // {
+  <replaceable>...</replaceable> if args ? doCoverageAnalysis &amp;&amp; args.doCoverageAnalysis then "bla" else "" <replaceable>...</replaceable>
+})
+</programlisting>
+
+  </para></listitem>
+
+</itemizedlist>
+
+</section>
+
+
+<section><title>Package naming</title>
+
+<para>In Nixpkgs, there are generally three different names associated with a package:
+
+<itemizedlist>
+
+  <listitem><para>The <varname>name</varname> attribute of the
+  derivation (excluding the version part).  This is what most users
+  see, in particular when using
+  <command>nix-env</command>.</para></listitem>
+
+  <listitem><para>The variable name used for the instantiated package
+  in <filename>all-packages.nix</filename>, and when passing it as a
+  dependency to other functions.  This is what Nix expression authors
+  see.  It can also be used when installing using <command>nix-env
+  -iA</command>.</para></listitem>
+
+  <listitem><para>The filename for (the directory containing) the Nix
+  expression.</para></listitem>
+
+</itemizedlist>
+
+Most of the time, these are the same.  For instance, the package
+<literal>e2fsprogs</literal> has a <varname>name</varname> attribute
+<literal>"e2fsprogs-<replaceable>version</replaceable>"</literal>, is
+bound to the variable name <varname>e2fsprogs</varname> in
+<filename>all-packages.nix</filename>, and the Nix expression is in
+<filename>pkgs/os-specific/linux/e2fsprogs/default.nix</filename>.
+</para>
+
+<para>There are a few naming guidelines:
+
+<itemizedlist>
+
+  <listitem><para>Generally, try to stick to the upstream package
+  name.</para></listitem>
+
+  <listitem><para>Don’t use uppercase letters in the
+  <literal>name</literal> attribute — e.g.,
+  <literal>"mplayer-1.0rc2"</literal> instead of
+  <literal>"MPlayer-1.0rc2"</literal>.</para></listitem>
+
+  <listitem><para>The version part of the <literal>name</literal>
+  attribute <emphasis>must</emphasis> start with a digit (following a
+  dash) — e.g., <literal>"hello-0.3-pre-r3910"</literal> instead of
+  <literal>"hello-svn-r3910"</literal>, as the latter would be seen as
+  a package named <literal>hello-svn</literal> by
+  <command>nix-env</command>.</para></listitem>
+
+  <listitem><para>Dashes in the package name should be preserved
+  in new variable names, rather than converted to underscores
+  (which was convention up to around 2013 and most names
+   still have underscores instead of dashes) — e.g.,
+  <varname>http-parser</varname> instead of
+  <varname>http_parser</varname>.</para></listitem>
+
+  <listitem><para>If there are multiple versions of a package, this
+  should be reflected in the variable names in
+  <filename>all-packages.nix</filename>,
+  e.g. <varname>json-c-0-9</varname> and <varname>json-c-0-11</varname>.
+  If there is an obvious “default” version, make an attribute like
+  <literal>json-c = json-c-0-9;</literal>.
+  See also <xref linkend="sec-versioning" /></para></listitem>
+
+</itemizedlist>
+
+</para>
+
+</section>
+
+
+<section xml:id="sec-organisation"><title>File naming and organisation</title>
+
+<para>Names of files and directories should be in lowercase, with
+dashes between words — not in camel case.  For instance, it should be
+<filename>all-packages.nix</filename>, not
+<filename>allPackages.nix</filename> or
+<filename>AllPackages.nix</filename>.</para>
+
+<section><title>Hierarchy</title>
+
+<para>Each package should be stored in its own directory somewhere in
+the <filename>pkgs/</filename> tree, i.e. in
+<filename>pkgs/<replaceable>category</replaceable>/<replaceable>subcategory</replaceable>/<replaceable>...</replaceable>/<replaceable>pkgname</replaceable></filename>.
+Below are some rules for picking the right category for a package.
+Many packages fall under several categories; what matters is the
+<emphasis>primary</emphasis> purpose of a package.  For example, the
+<literal>libxml2</literal> package builds both a library and some
+tools; but it’s a library foremost, so it goes under
+<filename>pkgs/development/libraries</filename>.</para>
+
+<para>When in doubt, consider refactoring the
+<filename>pkgs/</filename> tree, e.g. creating new categories or
+splitting up an existing category.</para>
+
+<variablelist>
+  <varlistentry>
+    <term>If it’s used to support <emphasis>software development</emphasis>:</term>
+    <listitem>
+      <variablelist>
+        <varlistentry>
+          <term>If it’s a <emphasis>library</emphasis> used by other packages:</term>
+          <listitem>
+            <para><filename>development/libraries</filename> (e.g. <filename>libxml2</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s a <emphasis>compiler</emphasis>:</term>
+          <listitem>
+            <para><filename>development/compilers</filename> (e.g. <filename>gcc</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s an <emphasis>interpreter</emphasis>:</term>
+          <listitem>
+            <para><filename>development/interpreters</filename> (e.g. <filename>guile</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s a (set of) development <emphasis>tool(s)</emphasis>:</term>
+          <listitem>
+            <variablelist>
+              <varlistentry>
+                <term>If it’s a <emphasis>parser generator</emphasis> (including lexers):</term>
+                <listitem>
+                  <para><filename>development/tools/parsing</filename> (e.g. <filename>bison</filename>, <filename>flex</filename>)</para>
+                </listitem>
+              </varlistentry>
+              <varlistentry>
+                <term>If it’s a <emphasis>build manager</emphasis>:</term>
+                <listitem>
+                  <para><filename>development/tools/build-managers</filename> (e.g. <filename>gnumake</filename>)</para>
+                </listitem>
+              </varlistentry>
+              <varlistentry>
+                <term>Else:</term>
+                <listitem>
+                  <para><filename>development/tools/misc</filename> (e.g. <filename>binutils</filename>)</para>
+                </listitem>
+              </varlistentry>
+            </variablelist>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>Else:</term>
+          <listitem>
+            <para><filename>development/misc</filename></para>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>If it’s a (set of) <emphasis>tool(s)</emphasis>:</term>
+    <listitem>
+      <para>(A tool is a relatively small program, especially one intented
+      to be used non-interactively.)</para>
+      <variablelist>
+        <varlistentry>
+          <term>If it’s for <emphasis>networking</emphasis>:</term>
+          <listitem>
+            <para><filename>tools/networking</filename> (e.g. <filename>wget</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s for <emphasis>text processing</emphasis>:</term>
+          <listitem>
+            <para><filename>tools/text</filename> (e.g. <filename>diffutils</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s a <emphasis>system utility</emphasis>, i.e.,
+          something related or essential to the operation of a
+          system:</term>
+          <listitem>
+            <para><filename>tools/system</filename> (e.g. <filename>cron</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s an <emphasis>archiver</emphasis> (which may
+          include a compression function):</term>
+          <listitem>
+            <para><filename>tools/archivers</filename> (e.g. <filename>zip</filename>, <filename>tar</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s a <emphasis>compression</emphasis> program:</term>
+          <listitem>
+            <para><filename>tools/compression</filename> (e.g. <filename>gzip</filename>, <filename>bzip2</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s a <emphasis>security</emphasis>-related program:</term>
+          <listitem>
+            <para><filename>tools/security</filename> (e.g. <filename>nmap</filename>, <filename>gnupg</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>Else:</term>
+          <listitem>
+            <para><filename>tools/misc</filename></para>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>If it’s a <emphasis>shell</emphasis>:</term>
+    <listitem>
+      <para><filename>shells</filename> (e.g. <filename>bash</filename>)</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>If it’s a <emphasis>server</emphasis>:</term>
+    <listitem>
+      <variablelist>
+        <varlistentry>
+          <term>If it’s a web server:</term>
+          <listitem>
+            <para><filename>servers/http</filename> (e.g. <filename>apache-httpd</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s an implementation of the X Windowing System:</term>
+          <listitem>
+            <para><filename>servers/x11</filename> (e.g. <filename>xorg</filename> — this includes the client libraries and programs)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>Else:</term>
+          <listitem>
+            <para><filename>servers/misc</filename></para>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>If it’s a <emphasis>desktop environment</emphasis>
+    (including <emphasis>window managers</emphasis>):</term>
+    <listitem>
+      <para><filename>desktops</filename> (e.g. <filename>kde</filename>, <filename>gnome</filename>, <filename>enlightenment</filename>)</para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>If it’s an <emphasis>application</emphasis>:</term>
+    <listitem>
+      <para>A (typically large) program with a distinct user
+      interface, primarily used interactively.</para>
+      <variablelist>
+        <varlistentry>
+          <term>If it’s a <emphasis>version management system</emphasis>:</term>
+          <listitem>
+            <para><filename>applications/version-management</filename> (e.g. <filename>subversion</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s for <emphasis>video playback / editing</emphasis>:</term>
+          <listitem>
+            <para><filename>applications/video</filename> (e.g. <filename>vlc</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s for <emphasis>graphics viewing / editing</emphasis>:</term>
+          <listitem>
+            <para><filename>applications/graphics</filename> (e.g. <filename>gimp</filename>)</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s for <emphasis>networking</emphasis>:</term>
+          <listitem>
+            <variablelist>
+              <varlistentry>
+                <term>If it’s a <emphasis>mailreader</emphasis>:</term>
+                <listitem>
+                  <para><filename>applications/networking/mailreaders</filename> (e.g. <filename>thunderbird</filename>)</para>
+                </listitem>
+              </varlistentry>
+              <varlistentry>
+                <term>If it’s a <emphasis>newsreader</emphasis>:</term>
+                <listitem>
+                  <para><filename>applications/networking/newsreaders</filename> (e.g. <filename>pan</filename>)</para>
+                </listitem>
+              </varlistentry>
+              <varlistentry>
+                <term>If it’s a <emphasis>web browser</emphasis>:</term>
+                <listitem>
+                  <para><filename>applications/networking/browsers</filename> (e.g. <filename>firefox</filename>)</para>
+                </listitem>
+              </varlistentry>
+              <varlistentry>
+                <term>Else:</term>
+                <listitem>
+                  <para><filename>applications/networking/misc</filename></para>
+                </listitem>
+              </varlistentry>
+            </variablelist>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>Else:</term>
+          <listitem>
+            <para><filename>applications/misc</filename></para>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>If it’s <emphasis>data</emphasis> (i.e., does not have a
+    straight-forward executable semantics):</term>
+    <listitem>
+      <variablelist>
+        <varlistentry>
+          <term>If it’s a <emphasis>font</emphasis>:</term>
+          <listitem>
+            <para><filename>data/fonts</filename></para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>If it’s related to <emphasis>SGML/XML processing</emphasis>:</term>
+          <listitem>
+            <variablelist>
+              <varlistentry>
+                <term>If it’s an <emphasis>XML DTD</emphasis>:</term>
+                <listitem>
+                  <para><filename>data/sgml+xml/schemas/xml-dtd</filename> (e.g. <filename>docbook</filename>)</para>
+                </listitem>
+              </varlistentry>
+              <varlistentry>
+                <term>If it’s an <emphasis>XSLT stylesheet</emphasis>:</term>
+                <listitem>
+                  <para>(Okay, these are executable...)</para>
+                  <para><filename>data/sgml+xml/stylesheets/xslt</filename> (e.g. <filename>docbook-xsl</filename>)</para>
+                </listitem>
+              </varlistentry>
+            </variablelist>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>If it’s a <emphasis>game</emphasis>:</term>
+    <listitem>
+      <para><filename>games</filename></para>
+    </listitem>
+  </varlistentry>
+  <varlistentry>
+    <term>Else:</term>
+    <listitem>
+      <para><filename>misc</filename></para>
+    </listitem>
+  </varlistentry>
+</variablelist>
+
+</section>
+
+<section xml:id="sec-versioning"><title>Versioning</title>
+
+<para>Because every version of a package in Nixpkgs creates a
+potential maintenance burden, old versions of a package should not be
+kept unless there is a good reason to do so.  For instance, Nixpkgs
+contains several versions of GCC because other packages don’t build
+with the latest version of GCC.  Other examples are having both the
+latest stable and latest pre-release version of a package, or to keep
+several major releases of an application that differ significantly in
+functionality.</para>
+
+<para>If there is only one version of a package, its Nix expression
+should be named <filename>e2fsprogs/default.nix</filename>.  If there
+are multiple versions, this should be reflected in the filename,
+e.g. <filename>e2fsprogs/1.41.8.nix</filename> and
+<filename>e2fsprogs/1.41.9.nix</filename>.  The version in the
+filename should leave out unnecessary detail.  For instance, if we
+keep the latest Firefox 2.0.x and 3.5.x versions in Nixpkgs, they
+should be named <filename>firefox/2.0.nix</filename> and
+<filename>firefox/3.5.nix</filename>, respectively (which, at a given
+point, might contain versions <literal>2.0.0.20</literal> and
+<literal>3.5.4</literal>).  If a version requires many auxiliary
+files, you can use a subdirectory for each version,
+e.g. <filename>firefox/2.0/default.nix</filename> and
+<filename>firefox/3.5/default.nix</filename>.</para>
+
+<para>All versions of a package <emphasis>must</emphasis> be included
+in <filename>all-packages.nix</filename> to make sure that they
+evaluate correctly.</para>
+
+</section>
+
+</section>
+
+
+</chapter>
--- a/doc/contributing/coding-conventions.xml
+++ b/doc/contributing/coding-conventions.xml
@ -1,924 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="chap-conventions">
- <title>Coding conventions</title>
- <section xml:id="sec-syntax">
-  <title>Syntax</title>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Use 2 spaces of indentation per indentation level in Nix expressions, 4 spaces in shell scripts.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Do not use tab characters, i.e. configure your editor to use soft tabs. For instance, use <literal>(setq-default indent-tabs-mode nil)</literal> in Emacs. Everybody has different tab settings so it’s asking for trouble.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Use <literal>lowerCamelCase</literal> for variable names, not <literal>UpperCamelCase</literal>. Note, this rule does not apply to package attribute names, which instead follow the rules in <xref linkend="sec-package-naming"/>.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Function calls with attribute set arguments are written as
-<programlisting>
-foo {
-  arg = ...;
-}
-</programlisting>
-     not
-<programlisting>
-foo
-{
-  arg = ...;
-}
-</programlisting>
-     Also fine is
-<programlisting>
-foo { arg = ...; }
-</programlisting>
-     if it's a short call.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     In attribute sets or lists that span multiple lines, the attribute names or list elements should be aligned:
-<programlisting>
-# A long list.
-list = [
-  elem1
-  elem2
-  elem3
-];
-
-# A long attribute set.
-attrs = {
-  attr1 = short_expr;
-  attr2 =
-    if true then big_expr else big_expr;
-};
-
-# Combined
-listOfAttrs = [
-  {
-    attr1 = 3;
-    attr2 = "fff";
-  }
-  {
-    attr1 = 5;
-    attr2 = "ggg";
-  }
-];
-</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Short lists or attribute sets can be written on one line:
-<programlisting>
-# A short list.
-list = [ elem1 elem2 elem3 ];
-
-# A short set.
-attrs = { x = 1280; y = 1024; };
-</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Breaking in the middle of a function argument can give hard-to-read code, like
-<programlisting>
-someFunction { x = 1280;
-  y = 1024; } otherArg
-  yetAnotherArg
-</programlisting>
-     (especially if the argument is very large, spanning multiple lines).
-    </para>
-    <para>
-     Better:
-<programlisting>
-someFunction
-  { x = 1280; y = 1024; }
-  otherArg
-  yetAnotherArg
-</programlisting>
-     or
-<programlisting>
-let res = { x = 1280; y = 1024; };
-in someFunction res otherArg yetAnotherArg
-</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     The bodies of functions, asserts, and withs are not indented to prevent a lot of superfluous indentation levels, i.e.
-<programlisting>
-{ arg1, arg2 }:
-assert system == "i686-linux";
-stdenv.mkDerivation { ...
-</programlisting>
-     not
-<programlisting>
-{ arg1, arg2 }:
-  assert system == "i686-linux";
-    stdenv.mkDerivation { ...
-</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Function formal arguments are written as:
-<programlisting>
-{ arg1, arg2, arg3 }:
-</programlisting>
-     but if they don't fit on one line they're written as:
-<programlisting>
-{ arg1, arg2, arg3
-, arg4, ...
-, # Some comment...
-  argN
-}:
-</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Functions should list their expected arguments as precisely as possible. That is, write
-<programlisting>
-{ stdenv, fetchurl, perl }: <replaceable>...</replaceable>
-</programlisting>
-     instead of
-<programlisting>
-args: with args; <replaceable>...</replaceable>
-</programlisting>
-     or
-<programlisting>
-{ stdenv, fetchurl, perl, ... }: <replaceable>...</replaceable>
-</programlisting>
-    </para>
-    <para>
-     For functions that are truly generic in the number of arguments (such as wrappers around <varname>mkDerivation</varname>) that have some required arguments, you should write them using an <literal>@</literal>-pattern:
-<programlisting>
-{ stdenv, doCoverageAnalysis ? false, ... } @ args:
-
-stdenv.mkDerivation (args // {
-  <replaceable>...</replaceable> if doCoverageAnalysis then "bla" else "" <replaceable>...</replaceable>
-})
-</programlisting>
-     instead of
-<programlisting>
-args:
-
-args.stdenv.mkDerivation (args // {
-  <replaceable>...</replaceable> if args ? doCoverageAnalysis &amp;&amp; args.doCoverageAnalysis then "bla" else "" <replaceable>...</replaceable>
-})
-</programlisting>
-    </para>
-   </listitem>
-  </itemizedlist>
- </section>
- <section xml:id="sec-package-naming">
-  <title>Package naming</title>
-
-  <para>
-   The key words <emphasis>must</emphasis>, <emphasis>must not</emphasis>, <emphasis>required</emphasis>, <emphasis>shall</emphasis>, <emphasis>shall not</emphasis>, <emphasis>should</emphasis>, <emphasis>should not</emphasis>, <emphasis>recommended</emphasis>, <emphasis>may</emphasis>, and <emphasis>optional</emphasis> in this section are to be interpreted as described in <link xlink:href="https://tools.ietf.org/html/rfc2119">RFC 2119</link>. Only <emphasis>emphasized</emphasis> words are to be interpreted in this way.
-  </para>
-
-  <para>
-   In Nixpkgs, there are generally three different names associated with a package:
-   <itemizedlist>
-    <listitem>
-     <para>
-      The <varname>name</varname> attribute of the derivation (excluding the version part). This is what most users see, in particular when using <command>nix-env</command>.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      The variable name used for the instantiated package in <filename>all-packages.nix</filename>, and when passing it as a dependency to other functions. Typically this is called the <emphasis>package attribute name</emphasis>. This is what Nix expression authors see. It can also be used when installing using <command>nix-env -iA</command>.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      The filename for (the directory containing) the Nix expression.
-     </para>
-    </listitem>
-   </itemizedlist>
-   Most of the time, these are the same. For instance, the package <literal>e2fsprogs</literal> has a <varname>name</varname> attribute <literal>"e2fsprogs-<replaceable>version</replaceable>"</literal>, is bound to the variable name <varname>e2fsprogs</varname> in <filename>all-packages.nix</filename>, and the Nix expression is in <filename>pkgs/os-specific/linux/e2fsprogs/default.nix</filename>.
-  </para>
-
-  <para>
-   There are a few naming guidelines:
-   <itemizedlist>
-    <listitem>
-     <para>
-      The <literal>name</literal> attribute <emphasis>should</emphasis> be identical to the upstream package name.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      The <literal>name</literal> attribute <emphasis>must not</emphasis> contain uppercase letters — e.g., <literal>"mplayer-1.0rc2"</literal> instead of <literal>"MPlayer-1.0rc2"</literal>.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      The version part of the <literal>name</literal> attribute <emphasis>must</emphasis> start with a digit (following a dash) — e.g., <literal>"hello-0.3.1rc2"</literal>.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      If a package is not a release but a commit from a repository, then the version part of the name <emphasis>must</emphasis> be the date of that (fetched) commit. The date <emphasis>must</emphasis> be in <literal>"YYYY-MM-DD"</literal> format. Also append <literal>"unstable"</literal> to the name - e.g., <literal>"pkgname-unstable-2014-09-23"</literal>.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      Dashes in the package name <emphasis>should</emphasis> be preserved in new variable names, rather than converted to underscores or camel cased — e.g., <varname>http-parser</varname> instead of <varname>http_parser</varname> or <varname>httpParser</varname>. The hyphenated style is preferred in all three package names.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      If there are multiple versions of a package, this <emphasis>should</emphasis> be reflected in the variable names in <filename>all-packages.nix</filename>, e.g. <varname>json-c-0-9</varname> and <varname>json-c-0-11</varname>. If there is an obvious “default” version, make an attribute like <literal>json-c = json-c-0-9;</literal>. See also <xref linkend="sec-versioning" />
-     </para>
-    </listitem>
-   </itemizedlist>
-  </para>
- </section>
- <section xml:id="sec-organisation">
-  <title>File naming and organisation</title>
-
-  <para>
-   Names of files and directories should be in lowercase, with dashes between words — not in camel case. For instance, it should be <filename>all-packages.nix</filename>, not <filename>allPackages.nix</filename> or <filename>AllPackages.nix</filename>.
-  </para>
-
-  <section xml:id="sec-hierarchy">
-   <title>Hierarchy</title>
-
-   <para>
-    Each package should be stored in its own directory somewhere in the <filename>pkgs/</filename> tree, i.e. in <filename>pkgs/<replaceable>category</replaceable>/<replaceable>subcategory</replaceable>/<replaceable>...</replaceable>/<replaceable>pkgname</replaceable></filename>. Below are some rules for picking the right category for a package. Many packages fall under several categories; what matters is the <emphasis>primary</emphasis> purpose of a package. For example, the <literal>libxml2</literal> package builds both a library and some tools; but it’s a library foremost, so it goes under <filename>pkgs/development/libraries</filename>.
-   </para>
-
-   <para>
-    When in doubt, consider refactoring the <filename>pkgs/</filename> tree, e.g. creating new categories or splitting up an existing category.
-   </para>
-
-   <variablelist>
-    <varlistentry>
-     <term>
-      If it’s used to support <emphasis>software development</emphasis>:
-     </term>
-     <listitem>
-      <variablelist>
-       <varlistentry>
-        <term>
-         If it’s a <emphasis>library</emphasis> used by other packages:
-        </term>
-        <listitem>
-         <para>
-          <filename>development/libraries</filename> (e.g. <filename>libxml2</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s a <emphasis>compiler</emphasis>:
-        </term>
-        <listitem>
-         <para>
-          <filename>development/compilers</filename> (e.g. <filename>gcc</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s an <emphasis>interpreter</emphasis>:
-        </term>
-        <listitem>
-         <para>
-          <filename>development/interpreters</filename> (e.g. <filename>guile</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s a (set of) development <emphasis>tool(s)</emphasis>:
-        </term>
-        <listitem>
-         <variablelist>
-          <varlistentry>
-           <term>
-            If it’s a <emphasis>parser generator</emphasis> (including lexers):
-           </term>
-           <listitem>
-            <para>
-             <filename>development/tools/parsing</filename> (e.g. <filename>bison</filename>, <filename>flex</filename>)
-            </para>
-           </listitem>
-          </varlistentry>
-          <varlistentry>
-           <term>
-            If it’s a <emphasis>build manager</emphasis>:
-           </term>
-           <listitem>
-            <para>
-             <filename>development/tools/build-managers</filename> (e.g. <filename>gnumake</filename>)
-            </para>
-           </listitem>
-          </varlistentry>
-          <varlistentry>
-           <term>
-            Else:
-           </term>
-           <listitem>
-            <para>
-             <filename>development/tools/misc</filename> (e.g. <filename>binutils</filename>)
-            </para>
-           </listitem>
-          </varlistentry>
-         </variablelist>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         Else:
-        </term>
-        <listitem>
-         <para>
-          <filename>development/misc</filename>
-         </para>
-        </listitem>
-       </varlistentry>
-      </variablelist>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      If it’s a (set of) <emphasis>tool(s)</emphasis>:
-     </term>
-     <listitem>
-      <para>
-       (A tool is a relatively small program, especially one intended to be used non-interactively.)
-      </para>
-      <variablelist>
-       <varlistentry>
-        <term>
-         If it’s for <emphasis>networking</emphasis>:
-        </term>
-        <listitem>
-         <para>
-          <filename>tools/networking</filename> (e.g. <filename>wget</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s for <emphasis>text processing</emphasis>:
-        </term>
-        <listitem>
-         <para>
-          <filename>tools/text</filename> (e.g. <filename>diffutils</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s a <emphasis>system utility</emphasis>, i.e., something related or essential to the operation of a system:
-        </term>
-        <listitem>
-         <para>
-          <filename>tools/system</filename> (e.g. <filename>cron</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s an <emphasis>archiver</emphasis> (which may include a compression function):
-        </term>
-        <listitem>
-         <para>
-          <filename>tools/archivers</filename> (e.g. <filename>zip</filename>, <filename>tar</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s a <emphasis>compression</emphasis> program:
-        </term>
-        <listitem>
-         <para>
-          <filename>tools/compression</filename> (e.g. <filename>gzip</filename>, <filename>bzip2</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s a <emphasis>security</emphasis>-related program:
-        </term>
-        <listitem>
-         <para>
-          <filename>tools/security</filename> (e.g. <filename>nmap</filename>, <filename>gnupg</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         Else:
-        </term>
-        <listitem>
-         <para>
-          <filename>tools/misc</filename>
-         </para>
-        </listitem>
-       </varlistentry>
-      </variablelist>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      If it’s a <emphasis>shell</emphasis>:
-     </term>
-     <listitem>
-      <para>
-       <filename>shells</filename> (e.g. <filename>bash</filename>)
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      If it’s a <emphasis>server</emphasis>:
-     </term>
-     <listitem>
-      <variablelist>
-       <varlistentry>
-        <term>
-         If it’s a web server:
-        </term>
-        <listitem>
-         <para>
-          <filename>servers/http</filename> (e.g. <filename>apache-httpd</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s an implementation of the X Windowing System:
-        </term>
-        <listitem>
-         <para>
-          <filename>servers/x11</filename> (e.g. <filename>xorg</filename> — this includes the client libraries and programs)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         Else:
-        </term>
-        <listitem>
-         <para>
-          <filename>servers/misc</filename>
-         </para>
-        </listitem>
-       </varlistentry>
-      </variablelist>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      If it’s a <emphasis>desktop environment</emphasis>:
-     </term>
-     <listitem>
-      <para>
-       <filename>desktops</filename> (e.g. <filename>kde</filename>, <filename>gnome</filename>, <filename>enlightenment</filename>)
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      If it’s a <emphasis>window manager</emphasis>:
-     </term>
-     <listitem>
-      <para>
-       <filename>applications/window-managers</filename> (e.g. <filename>awesome</filename>, <filename>stumpwm</filename>)
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      If it’s an <emphasis>application</emphasis>:
-     </term>
-     <listitem>
-      <para>
-       A (typically large) program with a distinct user interface, primarily used interactively.
-      </para>
-      <variablelist>
-       <varlistentry>
-        <term>
-         If it’s a <emphasis>version management system</emphasis>:
-        </term>
-        <listitem>
-         <para>
-          <filename>applications/version-management</filename> (e.g. <filename>subversion</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s for <emphasis>video playback / editing</emphasis>:
-        </term>
-        <listitem>
-         <para>
-          <filename>applications/video</filename> (e.g. <filename>vlc</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s for <emphasis>graphics viewing / editing</emphasis>:
-        </term>
-        <listitem>
-         <para>
-          <filename>applications/graphics</filename> (e.g. <filename>gimp</filename>)
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s for <emphasis>networking</emphasis>:
-        </term>
-        <listitem>
-         <variablelist>
-          <varlistentry>
-           <term>
-            If it’s a <emphasis>mailreader</emphasis>:
-           </term>
-           <listitem>
-            <para>
-             <filename>applications/networking/mailreaders</filename> (e.g. <filename>thunderbird</filename>)
-            </para>
-           </listitem>
-          </varlistentry>
-          <varlistentry>
-           <term>
-            If it’s a <emphasis>newsreader</emphasis>:
-           </term>
-           <listitem>
-            <para>
-             <filename>applications/networking/newsreaders</filename> (e.g. <filename>pan</filename>)
-            </para>
-           </listitem>
-          </varlistentry>
-          <varlistentry>
-           <term>
-            If it’s a <emphasis>web browser</emphasis>:
-           </term>
-           <listitem>
-            <para>
-             <filename>applications/networking/browsers</filename> (e.g. <filename>firefox</filename>)
-            </para>
-           </listitem>
-          </varlistentry>
-          <varlistentry>
-           <term>
-            Else:
-           </term>
-           <listitem>
-            <para>
-             <filename>applications/networking/misc</filename>
-            </para>
-           </listitem>
-          </varlistentry>
-         </variablelist>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         Else:
-        </term>
-        <listitem>
-         <para>
-          <filename>applications/misc</filename>
-         </para>
-        </listitem>
-       </varlistentry>
-      </variablelist>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      If it’s <emphasis>data</emphasis> (i.e., does not have a straight-forward executable semantics):
-     </term>
-     <listitem>
-      <variablelist>
-       <varlistentry>
-        <term>
-         If it’s a <emphasis>font</emphasis>:
-        </term>
-        <listitem>
-         <para>
-          <filename>data/fonts</filename>
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s an <emphasis>icon theme</emphasis>:
-        </term>
-        <listitem>
-         <para>
-          <filename>data/icons</filename>
-         </para>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s related to <emphasis>SGML/XML processing</emphasis>:
-        </term>
-        <listitem>
-         <variablelist>
-          <varlistentry>
-           <term>
-            If it’s an <emphasis>XML DTD</emphasis>:
-           </term>
-           <listitem>
-            <para>
-             <filename>data/sgml+xml/schemas/xml-dtd</filename> (e.g. <filename>docbook</filename>)
-            </para>
-           </listitem>
-          </varlistentry>
-          <varlistentry>
-           <term>
-            If it’s an <emphasis>XSLT stylesheet</emphasis>:
-           </term>
-           <listitem>
-            <para>
-             (Okay, these are executable...)
-            </para>
-            <para>
-             <filename>data/sgml+xml/stylesheets/xslt</filename> (e.g. <filename>docbook-xsl</filename>)
-            </para>
-           </listitem>
-          </varlistentry>
-         </variablelist>
-        </listitem>
-       </varlistentry>
-       <varlistentry>
-        <term>
-         If it’s a <emphasis>theme</emphasis> for a <emphasis>desktop environment</emphasis>,
-         a <emphasis>window manager</emphasis> or a <emphasis>display manager</emphasis>:
-        </term>
-        <listitem>
-         <para>
-          <filename>data/themes</filename>
-         </para>
-        </listitem>
-       </varlistentry>
-      </variablelist>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      If it’s a <emphasis>game</emphasis>:
-     </term>
-     <listitem>
-      <para>
-       <filename>games</filename>
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      Else:
-     </term>
-     <listitem>
-      <para>
-       <filename>misc</filename>
-      </para>
-     </listitem>
-    </varlistentry>
-   </variablelist>
-  </section>
-
-  <section xml:id="sec-versioning">
-   <title>Versioning</title>
-
-   <para>
-    Because every version of a package in Nixpkgs creates a potential maintenance burden, old versions of a package should not be kept unless there is a good reason to do so. For instance, Nixpkgs contains several versions of GCC because other packages don’t build with the latest version of GCC. Other examples are having both the latest stable and latest pre-release version of a package, or to keep several major releases of an application that differ significantly in functionality.
-   </para>
-
-   <para>
-    If there is only one version of a package, its Nix expression should be named <filename>e2fsprogs/default.nix</filename>. If there are multiple versions, this should be reflected in the filename, e.g. <filename>e2fsprogs/1.41.8.nix</filename> and <filename>e2fsprogs/1.41.9.nix</filename>. The version in the filename should leave out unnecessary detail. For instance, if we keep the latest Firefox 2.0.x and 3.5.x versions in Nixpkgs, they should be named <filename>firefox/2.0.nix</filename> and <filename>firefox/3.5.nix</filename>, respectively (which, at a given point, might contain versions <literal>2.0.0.20</literal> and <literal>3.5.4</literal>). If a version requires many auxiliary files, you can use a subdirectory for each version, e.g. <filename>firefox/2.0/default.nix</filename> and <filename>firefox/3.5/default.nix</filename>.
-   </para>
-
-   <para>
-    All versions of a package <emphasis>must</emphasis> be included in <filename>all-packages.nix</filename> to make sure that they evaluate correctly.
-   </para>
-  </section>
- </section>
- <section xml:id="sec-sources">
-  <title>Fetching Sources</title>
-
-  <para>
-   There are multiple ways to fetch a package source in nixpkgs. The general guideline is that you should package reproducible sources with a high degree of availability. Right now there is only one fetcher which has mirroring support and that is <literal>fetchurl</literal>. Note that you should also prefer protocols which have a corresponding proxy environment variable.
-  </para>
-
-  <para>
-   You can find many source fetch helpers in <literal>pkgs/build-support/fetch*</literal>.
-  </para>
-
-  <para>
-   In the file <literal>pkgs/top-level/all-packages.nix</literal> you can find fetch helpers, these have names on the form <literal>fetchFrom*</literal>. The intention of these are to provide snapshot fetches but using the same api as some of the version controlled fetchers from <literal>pkgs/build-support/</literal>. As an example going from bad to good:
-   <itemizedlist>
-    <listitem>
-     <para>
-      Bad: Uses <literal>git://</literal> which won't be proxied.
-<programlisting>
-src = fetchgit {
-  url = "git://github.com/NixOS/nix.git";
-  rev = "1f795f9f44607cc5bec70d1300150bfefcef2aae";
-  sha256 = "1cw5fszffl5pkpa6s6wjnkiv6lm5k618s32sp60kvmvpy7a2v9kg";
-}
-</programlisting>
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      Better: This is ok, but an archive fetch will still be faster.
-<programlisting>
-src = fetchgit {
-  url = "https://github.com/NixOS/nix.git";
-  rev = "1f795f9f44607cc5bec70d1300150bfefcef2aae";
-  sha256 = "1cw5fszffl5pkpa6s6wjnkiv6lm5k618s32sp60kvmvpy7a2v9kg";
-}
-</programlisting>
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      Best: Fetches a snapshot archive and you get the rev you want.
-<programlisting>
-src = fetchFromGitHub {
-  owner = "NixOS";
-  repo = "nix";
-  rev = "1f795f9f44607cc5bec70d1300150bfefcef2aae";
-  sha256 = "1i2yxndxb6yc9l6c99pypbd92lfq5aac4klq7y2v93c9qvx2cgpc";
-}
-</programlisting>
-      Find the value to put as <literal>sha256</literal> by running <literal>nix run -f '&lt;nixpkgs&gt;' nix-prefetch-github -c nix-prefetch-github --rev 1f795f9f44607cc5bec70d1300150bfefcef2aae NixOS nix</literal> or <literal>nix-prefetch-url --unpack https://github.com/NixOS/nix/archive/1f795f9f44607cc5bec70d1300150bfefcef2aae.tar.gz</literal>.
-     </para>
-    </listitem>
-   </itemizedlist>
-  </para>
- </section>
- <section xml:id="sec-source-hashes">
-  <title>Obtaining source hash</title>
-
-  <para>
-   Preferred source hash type is sha256. There are several ways to get it.
-  </para>
-
-  <orderedlist>
-   <listitem>
-    <para>
-     Prefetch URL (with <literal>nix-prefetch-<replaceable>XXX</replaceable> <replaceable>URL</replaceable></literal>, where <replaceable>XXX</replaceable> is one of <literal>url</literal>, <literal>git</literal>, <literal>hg</literal>, <literal>cvs</literal>, <literal>bzr</literal>, <literal>svn</literal>). Hash is printed to stdout.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Prefetch by package source (with <literal>nix-prefetch-url '&lt;nixpkgs&gt;' -A <replaceable>PACKAGE</replaceable>.src</literal>, where <replaceable>PACKAGE</replaceable> is package attribute name). Hash is printed to stdout.
-    </para>
-    <para>
-     This works well when you've upgraded existing package version and want to find out new hash, but is useless if package can't be accessed by attribute or package has multiple sources (<literal>.srcs</literal>, architecture-dependent sources, etc).
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Upstream provided hash: use it when upstream provides <literal>sha256</literal> or <literal>sha512</literal> (when upstream provides <literal>md5</literal>, don't use it, compute <literal>sha256</literal> instead).
-    </para>
-    <para>
-     A little nuance is that <literal>nix-prefetch-*</literal> tools produce hash encoded with <literal>base32</literal>, but upstream usually provides hexadecimal (<literal>base16</literal>) encoding. Fetchers understand both formats. Nixpkgs does not standardize on any one format.
-    </para>
-    <para>
-     You can convert between formats with nix-hash, for example:
-<screen>
-<prompt>$ </prompt>nix-hash --type sha256 --to-base32 <replaceable>HASH</replaceable>
-</screen>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Extracting hash from local source tarball can be done with <literal>sha256sum</literal>. Use <literal>nix-prefetch-url file:///path/to/tarball </literal> if you want base32 hash.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Fake hash: set fake hash in package expression, perform build and extract correct hash from error Nix prints.
-    </para>
-    <para>
-     For package updates it is enough to change one symbol to make hash fake. For new packages, you can use <literal>lib.fakeSha256</literal>, <literal>lib.fakeSha512</literal> or any other fake hash.
-    </para>
-    <para>
-     This is last resort method when reconstructing source URL is non-trivial and <literal>nix-prefetch-url -A</literal> isn't applicable (for example, <link xlink:href="https://github.com/NixOS/nixpkgs/blob/d2ab091dd308b99e4912b805a5eb088dd536adb9/pkgs/applications/video/kodi/default.nix#L73"> one of <literal>kodi</literal> dependencies</link>). The easiest way then would be replace hash with a fake one and rebuild. Nix build will fail and error message will contain desired hash.
-    </para>
-    <warning>
-     <para>
-      This method has security problems. Check below for details.
-     </para>
-    </warning>
-   </listitem>
-  </orderedlist>
-
-  <section xml:id="sec-source-hashes-security">
-   <title>Obtaining hashes securely</title>
-
-   <para>
-    Let's say Man-in-the-Middle (MITM) sits close to your network. Then instead of fetching source you can fetch malware, and instead of source hash you get hash of malware. Here are security considerations for this scenario:
-   </para>
-
-   <itemizedlist>
-    <listitem>
-     <para>
-      <literal>http://</literal> URLs are not secure to prefetch hash from;
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      hashes from upstream (in method 3) should be obtained via secure protocol;
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      <literal>https://</literal> URLs are secure in methods 1, 2, 3;
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      <literal>https://</literal> URLs are not secure in method 5. When obtaining hashes with fake hash method, TLS checks are disabled. So refetch source hash from several different networks to exclude MITM scenario. Alternatively, use fake hash method to make Nix error, but instead of extracting hash from error, extract <literal>https://</literal> URL and prefetch it with method 1.
-     </para>
-    </listitem>
-   </itemizedlist>
-  </section>
- </section>
- <section xml:id="sec-patches">
-  <title>Patches</title>
-
-  <para>
-   Patches available online should be retrieved using <literal>fetchpatch</literal>.
-  </para>
-
-  <para>
-<programlisting>
-patches = [
-  (fetchpatch {
-    name = "fix-check-for-using-shared-freetype-lib.patch";
-    url = "http://git.ghostscript.com/?p=ghostpdl.git;a=patch;h=8f5d285";
-    sha256 = "1f0k043rng7f0rfl9hhb89qzvvksqmkrikmm38p61yfx51l325xr";
-  })
-];
-</programlisting>
-  </para>
-
-  <para>
-   Otherwise, you can add a <literal>.patch</literal> file to the <literal>nixpkgs</literal> repository. In the interest of keeping our maintenance burden to a minimum, only patches that are unique to <literal>nixpkgs</literal> should be added in this way.
-  </para>
-
-  <para>
-<programlisting>
-patches = [ ./0001-changes.patch ];
-</programlisting>
-  </para>
-
-  <para>
-   If you do need to do create this sort of patch file, one way to do so is with git:
-   <orderedlist>
-    <listitem>
-     <para>
-      Move to the root directory of the source code you're patching.
-<screen>
-<prompt>$ </prompt>cd the/program/source</screen>
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      If a git repository is not already present, create one and stage all of the source files.
-<screen>
-<prompt>$ </prompt>git init
-<prompt>$ </prompt>git add .</screen>
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      Edit some files to make whatever changes need to be included in the patch.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      Use git to create a diff, and pipe the output to a patch file:
-<screen>
-<prompt>$ </prompt>git diff > nixpkgs/pkgs/the/package/0001-changes.patch</screen>
-     </para>
-    </listitem>
-   </orderedlist>
-  </para>
- </section>
-</chapter>
--- a/doc/contributing/contributing-to-documentation.xml
+++ b/doc/contributing/contributing-to-documentation.xml
@ -1,30 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="chap-contributing">
- <title>Contributing to this documentation</title>
- <para>
-  The DocBook sources of the Nixpkgs manual are in the <filename
-xlink:href="https://github.com/NixOS/nixpkgs/tree/master/doc">doc</filename> subdirectory of the Nixpkgs repository.
- </para>
- <para>
-  You can quickly check your edits with <command>make</command>:
- </para>
-<screen>
-<prompt>$ </prompt>cd /path/to/nixpkgs/doc
-<prompt>$ </prompt>nix-shell
-<prompt>[nix-shell]$ </prompt>make
-</screen>
- <para>
-  If you experience problems, run <command>make debug</command> to help understand the docbook errors.
- </para>
- <para>
-  After making modifications to the manual, it's important to build it before committing. You can do that as follows:
-<screen>
-<prompt>$ </prompt>cd /path/to/nixpkgs/doc
-<prompt>$ </prompt>nix-shell
-<prompt>[nix-shell]$ </prompt>make clean
-<prompt>[nix-shell]$ </prompt>nix-build .
-</screen>
-  If the build succeeds, the manual will be in <filename>./result/share/doc/nixpkgs/manual.html</filename>.
- </para>
-</chapter>
--- a/doc/contributing/quick-start.xml
+++ b/doc/contributing/quick-start.xml
@ -1,152 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="chap-quick-start">
- <title>Quick Start to Adding a Package</title>
- <para>
-  To add a package to Nixpkgs:
-  <orderedlist>
-   <listitem>
-    <para>
-     Checkout the Nixpkgs source tree:
-<screen>
-<prompt>$ </prompt>git clone https://github.com/NixOS/nixpkgs
-<prompt>$ </prompt>cd nixpkgs</screen>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Find a good place in the Nixpkgs tree to add the Nix expression for your package. For instance, a library package typically goes into <filename>pkgs/development/libraries/<replaceable>pkgname</replaceable></filename>, while a web browser goes into <filename>pkgs/applications/networking/browsers/<replaceable>pkgname</replaceable></filename>. See <xref linkend="sec-organisation" /> for some hints on the tree organisation. Create a directory for your package, e.g.
-<screen>
-<prompt>$ </prompt>mkdir pkgs/development/libraries/libfoo</screen>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     In the package directory, create a Nix expression — a piece of code that describes how to build the package. In this case, it should be a <emphasis>function</emphasis> that is called with the package dependencies as arguments, and returns a build of the package in the Nix store. The expression should usually be called <filename>default.nix</filename>.
-<screen>
-<prompt>$ </prompt>emacs pkgs/development/libraries/libfoo/default.nix
-<prompt>$ </prompt>git add pkgs/development/libraries/libfoo/default.nix</screen>
-    </para>
-    <para>
-     You can have a look at the existing Nix expressions under <filename>pkgs/</filename> to see how it’s done. Here are some good ones:
-     <itemizedlist>
-      <listitem>
-       <para>
-        GNU Hello: <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/misc/hello/default.nix"><filename>pkgs/applications/misc/hello/default.nix</filename></link>. Trivial package, which specifies some <varname>meta</varname> attributes which is good practice.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        GNU cpio: <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/archivers/cpio/default.nix"><filename>pkgs/tools/archivers/cpio/default.nix</filename></link>. Also a simple package. The generic builder in <varname>stdenv</varname> does everything for you. It has no dependencies beyond <varname>stdenv</varname>.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        GNU Multiple Precision arithmetic library (GMP): <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/libraries/gmp/5.1.x.nix"><filename>pkgs/development/libraries/gmp/5.1.x.nix</filename></link>. Also done by the generic builder, but has a dependency on <varname>m4</varname>.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Pan, a GTK-based newsreader: <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/networking/newsreaders/pan/default.nix"><filename>pkgs/applications/networking/newsreaders/pan/default.nix</filename></link>. Has an optional dependency on <varname>gtkspell</varname>, which is only built if <varname>spellCheck</varname> is <literal>true</literal>.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Apache HTTPD: <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/servers/http/apache-httpd/2.4.nix"><filename>pkgs/servers/http/apache-httpd/2.4.nix</filename></link>. A bunch of optional features, variable substitutions in the configure flags, a post-install hook, and miscellaneous hackery.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Thunderbird: <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/networking/mailreaders/thunderbird/default.nix"><filename>pkgs/applications/networking/mailreaders/thunderbird/default.nix</filename></link>. Lots of dependencies.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        JDiskReport, a Java utility: <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/misc/jdiskreport/default.nix"><filename>pkgs/tools/misc/jdiskreport/default.nix</filename></link>. Nixpkgs doesn’t have a decent <varname>stdenv</varname> for Java yet so this is pretty ad-hoc.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        XML::Simple, a Perl module: <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/perl-packages.nix"><filename>pkgs/top-level/perl-packages.nix</filename></link> (search for the <varname>XMLSimple</varname> attribute). Most Perl modules are so simple to build that they are defined directly in <filename>perl-packages.nix</filename>; no need to make a separate file for them.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Adobe Reader: <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/misc/adobe-reader/default.nix"><filename>pkgs/applications/misc/adobe-reader/default.nix</filename></link>. Shows how binary-only packages can be supported. In particular the <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/misc/adobe-reader/builder.sh">builder</link> uses <command>patchelf</command> to set the RUNPATH and ELF interpreter of the executables so that the right libraries are found at runtime.
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-    <para>
-     Some notes:
-     <itemizedlist>
-      <listitem>
-       <para>
-        All <varname linkend="chap-meta">meta</varname> attributes are optional, but it’s still a good idea to provide at least the <varname>description</varname>, <varname>homepage</varname> and <varname
-          linkend="sec-meta-license">license</varname>.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        You can use <command>nix-prefetch-url</command> <replaceable>url</replaceable> to get the SHA-256 hash of source distributions. There are similar commands as <command>nix-prefetch-git</command> and <command>nix-prefetch-hg</command> available in <literal>nix-prefetch-scripts</literal> package.
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        A list of schemes for <literal>mirror://</literal> URLs can be found in <link
-          xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/fetchurl/mirrors.nix"><filename>pkgs/build-support/fetchurl/mirrors.nix</filename></link>.
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-    <para>
-     The exact syntax and semantics of the Nix expression language, including the built-in function, are described in the Nix manual in the <link
-    xlink:href="https://hydra.nixos.org/job/nix/trunk/tarball/latest/download-by-type/doc/manual/#chap-writing-nix-expressions">chapter on writing Nix expressions</link>.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Add a call to the function defined in the previous step to <link
-    xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/all-packages.nix"><filename>pkgs/top-level/all-packages.nix</filename></link> with some descriptive name for the variable, e.g. <varname>libfoo</varname>.
-<screen>
-<prompt>$ </prompt>emacs pkgs/top-level/all-packages.nix</screen>
-    </para>
-    <para>
-     The attributes in that file are sorted by category (like “Development / Libraries”) that more-or-less correspond to the directory structure of Nixpkgs, and then by attribute name.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     To test whether the package builds, run the following command from the root of the nixpkgs source tree:
-<screen>
-<prompt>$ </prompt>nix-build -A libfoo</screen>
-     where <varname>libfoo</varname> should be the variable name defined in the previous step. You may want to add the flag <option>-K</option> to keep the temporary build directory in case something fails. If the build succeeds, a symlink <filename>./result</filename> to the package in the Nix store is created.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     If you want to install the package into your profile (optional), do
-<screen>
-<prompt>$ </prompt>nix-env -f . -iA libfoo</screen>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Optionally commit the new package and open a pull request <link
-     xlink:href="https://github.com/NixOS/nixpkgs/pulls">to nixpkgs</link>, or use <link
-     xlink:href="https://discourse.nixos.org/t/about-the-patches-category/477"> the Patches category</link> on Discourse for sending a patch without a GitHub account.
-    </para>
-   </listitem>
-  </orderedlist>
- </para>
-</chapter>
--- a/doc/contributing/reviewing-contributions.xml
+++ b/doc/contributing/reviewing-contributions.xml
@ -1,536 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-        xmlns:xlink="http://www.w3.org/1999/xlink"
-        xmlns:xi="http://www.w3.org/2001/XInclude"
-        version="5.0"
-        xml:id="chap-reviewing-contributions">
- <title>Reviewing contributions</title>
- <warning>
-  <para>
-   The following section is a draft, and the policy for reviewing is still being discussed in issues such as <link
-	   xlink:href="https://github.com/NixOS/nixpkgs/issues/11166">#11166 </link> and <link
-	   xlink:href="https://github.com/NixOS/nixpkgs/issues/20836">#20836 </link>.
-  </para>
- </warning>
- <para>
-  The Nixpkgs project receives a fairly high number of contributions via GitHub pull requests. Reviewing and approving these is an important task and a way to contribute to the project.
- </para>
- <para>
-  The high change rate of Nixpkgs makes any pull request that remains open for too long subject to conflicts that will require extra work from the submitter or the merger. Reviewing pull requests in a timely manner and being responsive to the comments is the key to avoid this issue. GitHub provides sort filters that can be used to see the <link
-  xlink:href="https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+is%3Aopen+sort%3Aupdated-desc">most recently</link> and the <link
-  xlink:href="https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+is%3Aopen+sort%3Aupdated-asc">least recently</link> updated pull requests. We highly encourage looking at <link xlink:href="https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+is%3Aopen+review%3Anone+status%3Asuccess+-label%3A%222.status%3A+work-in-progress%22+no%3Aproject+no%3Aassignee+no%3Amilestone"> this list of ready to merge, unreviewed pull requests</link>.
- </para>
- <para>
-  When reviewing a pull request, please always be nice and polite. Controversial changes can lead to controversial opinions, but it is important to respect every community member and their work.
- </para>
- <para>
-  GitHub provides reactions as a simple and quick way to provide feedback to pull requests or any comments. The thumb-down reaction should be used with care and if possible accompanied with some explanation so the submitter has directions to improve their contribution.
- </para>
- <para>
-  pull request reviews should include a list of what has been reviewed in a comment, so other reviewers and mergers can know the state of the review.
- </para>
- <para>
-  All the review template samples provided in this section are generic and meant as examples. Their usage is optional and the reviewer is free to adapt them to their liking.
- </para>
- <section xml:id="reviewing-contributions-package-updates">
-  <title>Package updates</title>
-
-  <para>
-   A package update is the most trivial and common type of pull request. These pull requests mainly consist of updating the version part of the package name and the source hash.
-  </para>
-
-  <para>
-   It can happen that non-trivial updates include patches or more complex changes.
-  </para>
-
-  <para>
-   Reviewing process:
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Add labels to the pull request. (Requires commit rights)
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>8.has: package (update)</literal> and any topic label that fit the updated package.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the package versioning fits the guidelines.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the commit text fits the guidelines.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the package maintainers are notified.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <link xlink:href="https://help.github.com/articles/about-codeowners/">CODEOWNERS</link> will make GitHub notify users based on the submitted changes, but it can happen that it misses some of the package maintainers.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the meta field information is correct.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       License can change with version updates, so it should be checked to match the upstream license.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       If the package has no maintainer, a maintainer must be set. This can be the update submitter or a community member that accepts to take maintainership of the package.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the code contains no typos.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Building the package locally.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       pull requests are often targeted to the master or staging branch, and building the pull request locally when it is submitted can trigger many source builds.
-      </para>
-      <para>
-       It is possible to rebase the changes on nixos-unstable or nixpkgs-unstable for easier review by running the following commands from a nixpkgs clone.
-<screen>
-<prompt>$ </prompt>git fetch origin nixos-unstable <co xml:id='reviewing-rebase-2' />
-<prompt>$ </prompt>git fetch origin pull/PRNUMBER/head <co xml:id='reviewing-rebase-3' />
-<prompt>$ </prompt>git rebase --onto nixos-unstable BASEBRANCH FETCH_HEAD <co
-  xml:id='reviewing-rebase-4' />
-</screen>
-       <calloutlist>
-        <callout arearefs='reviewing-rebase-2'>
-         <para>
-          Fetching the nixos-unstable branch.
-         </para>
-        </callout>
-        <callout arearefs='reviewing-rebase-3'>
-         <para>
-          Fetching the pull request changes, <varname>PRNUMBER</varname> is the number at the end of the pull request title and <varname>BASEBRANCH</varname> the base branch of the pull request.
-         </para>
-        </callout>
-        <callout arearefs='reviewing-rebase-4'>
-         <para>
-          Rebasing the pull request changes to the nixos-unstable branch.
-         </para>
-        </callout>
-       </calloutlist>
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       The <link xlink:href="https://github.com/Mic92/nixpkgs-review">nixpkgs-review</link> tool can be used to review a pull request content in a single command. <varname>PRNUMBER</varname> should be replaced by the number at the end of the pull request title. You can also provide the full github pull request url.
-      </para>
-<screen>
-<prompt>$ </prompt>nix-shell -p nixpkgs-review --run "nixpkgs-review pr PRNUMBER"
-</screen>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Running every binary.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <example xml:id="reviewing-contributions-sample-package-update">
-   <title>Sample template for a package update review</title>
-<screen>
-##### Reviewed points
-
- [ ] package name fits guidelines
- [ ] package version fits guidelines
- [ ] package build on ARCHITECTURE
- [ ] executables tested on ARCHITECTURE
- [ ] all depending packages build
-
-##### Possible improvements
-
-##### Comments
-
-</screen>
-  </example>
- </section>
- <section xml:id="reviewing-contributions-new-packages">
-  <title>New packages</title>
-
-  <para>
-   New packages are a common type of pull requests. These pull requests consists in adding a new nix-expression for a package.
-  </para>
-
-  <para>
-   Reviewing process:
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Add labels to the pull request. (Requires commit rights)
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>8.has: package (new)</literal> and any topic label that fit the new package.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the package versioning is fitting the guidelines.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the commit name is fitting the guidelines.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the meta field contains correct information.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       License must be checked to be fitting upstream license.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       Platforms should be set or the package will not get binary substitutes.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       A maintainer must be set. This can be the package submitter or a community member that accepts to take maintainership of the package.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the code contains no typos.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure the package source.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Mirrors urls should be used when available.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       The most appropriate function should be used (e.g. packages from GitHub should use <literal>fetchFromGitHub</literal>).
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Building the package locally.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Running every binary.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <example xml:id="reviewing-contributions-sample-new-package">
-   <title>Sample template for a new package review</title>
-<screen>
-##### Reviewed points
-
- [ ] package path fits guidelines
- [ ] package name fits guidelines
- [ ] package version fits guidelines
- [ ] package build on ARCHITECTURE
- [ ] executables tested on ARCHITECTURE
- [ ] `meta.description` is set and fits guidelines
- [ ] `meta.license` fits upstream license
- [ ] `meta.platforms` is set
- [ ] `meta.maintainers` is set
- [ ] build time only dependencies are declared in `nativeBuildInputs`
- [ ] source is fetched using the appropriate function
- [ ] phases are respected
- [ ] patches that are remotely available are fetched with `fetchpatch`
-
-##### Possible improvements
-
-##### Comments
-
-</screen>
-  </example>
- </section>
- <section xml:id="reviewing-contributions-module-updates">
-  <title>Module updates</title>
-
-  <para>
-   Module updates are submissions changing modules in some ways. These often contains changes to the options or introduce new options.
-  </para>
-
-  <para>
-   Reviewing process
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Add labels to the pull request. (Requires commit rights)
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>8.has: module (update)</literal> and any topic label that fit the module.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the module maintainers are notified.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <link xlink:href="https://help.github.com/articles/about-codeowners/">CODEOWNERS</link> will make GitHub notify users based on the submitted changes, but it can happen that it misses some of the package maintainers.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the module tests, if any, are succeeding.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the introduced options are correct.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Type should be appropriate (string related types differs in their merging capabilities, <literal>optionSet</literal> and <literal>string</literal> types are deprecated).
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       Description, default and example should be provided.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that option changes are backward compatible.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>mkRenamedOptionModule</literal> and <literal>mkAliasOptionModule</literal> functions provide way to make option changes backward compatible.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that removed options are declared with <literal>mkRemovedOptionModule</literal>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that changes that are not backward compatible are mentioned in release notes.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that documentations affected by the change is updated.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <example xml:id="reviewing-contributions-sample-module-update">
-   <title>Sample template for a module update review</title>
-<screen>
-##### Reviewed points
-
- [ ] changes are backward compatible
- [ ] removed options are declared with `mkRemovedOptionModule`
- [ ] changes that are not backward compatible are documented in release notes
- [ ] module tests succeed on ARCHITECTURE
- [ ] options types are appropriate
- [ ] options description is set
- [ ] options example is provided
- [ ] documentation affected by the changes is updated
-
-##### Possible improvements
-
-##### Comments
-
-</screen>
-  </example>
- </section>
- <section xml:id="reviewing-contributions-new-modules">
-  <title>New modules</title>
-
-  <para>
-   New modules submissions introduce a new module to NixOS.
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Add labels to the pull request. (Requires commit rights)
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       <literal>8.has: module (new)</literal> and any topic label that fit the module.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the module tests, if any, are succeeding.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the introduced options are correct.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Type should be appropriate (string related types differs in their merging capabilities, <literal>optionSet</literal> and <literal>string</literal> types are deprecated).
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       Description, default and example should be provided.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that module <literal>meta</literal> field is present
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Maintainers should be declared in <literal>meta.maintainers</literal>.
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       Module documentation should be declared with <literal>meta.doc</literal>.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Ensure that the module respect other modules functionality.
-    </para>
-    <itemizedlist>
-     <listitem>
-      <para>
-       For example, enabling a module should not open firewall ports by default.
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-  </itemizedlist>
-
-  <example xml:id="reviewing-contributions-sample-new-module">
-   <title>Sample template for a new module review</title>
-<screen>
-##### Reviewed points
-
- [ ] module path fits the guidelines
- [ ] module tests succeed on ARCHITECTURE
- [ ] options have appropriate types
- [ ] options have default
- [ ] options have example
- [ ] options have descriptions
- [ ] No unneeded package is added to environment.systemPackages
- [ ] meta.maintainers is set
- [ ] module documentation is declared in meta.doc
-
-##### Possible improvements
-
-##### Comments
-
-</screen>
-  </example>
- </section>
- <section xml:id="reviewing-contributions-other-submissions">
-  <title>Other submissions</title>
-
-  <para>
-   Other type of submissions requires different reviewing steps.
-  </para>
-
-  <para>
-   If you consider having enough knowledge and experience in a topic and would like to be a long-term reviewer for related submissions, please contact the current reviewers for that topic. They will give you information about the reviewing process. The main reviewers for a topic can be hard to find as there is no list, but checking past pull requests to see who reviewed or git-blaming the code to see who committed to that topic can give some hints.
-  </para>
-
-  <para>
-   Container system, boot system and library changes are some examples of the pull requests fitting this category.
-  </para>
- </section>
- <section xml:id="reviewing-contributions--merging-pull-requests">
-  <title>Merging pull requests</title>
-
-  <para>
-   It is possible for community members that have enough knowledge and experience on a special topic to contribute by merging pull requests.
-  </para>
-
-  <para>
-   TODO: add the procedure to request merging rights.
-  </para>
-
-<!--
-The following paragraph about how to deal with unactive contributors is just a
-proposition and should be modified to what the community agrees to be the right
-policy.
-
-<para>Please note that contributors with commit rights unactive for more than
-  three months will have their commit rights revoked.</para>
-->
-
-  <para>
-   In a case a contributor definitively leaves the Nix community, they should create an issue or post on <link
-   xlink:href="https://discourse.nixos.org">Discourse</link> with references of packages and modules they maintain so the maintainership can be taken over by other contributors.
-  </para>
- </section>
-</chapter>
--- a/doc/contributing/submitting-changes.xml
+++ b/doc/contributing/submitting-changes.xml
@ -1,455 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="chap-submitting-changes">
- <title>Submitting changes</title>
- <section xml:id="submitting-changes-making-patches">
-  <title>Making patches</title>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Read <link xlink:href="https://nixos.org/nixpkgs/manual/">Manual (How to write packages for Nix)</link>.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Fork <link xlink:href="https://github.com/nixos/nixpkgs/">the Nixpkgs repository</link> on GitHub.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Create a branch for your future fix.
-     <itemizedlist>
-      <listitem>
-       <para>
-        You can make branch from a commit of your local <command>nixos-version</command>. That will help you to avoid additional local compilations. Because you will receive packages from binary cache. For example
-<screen>
-<prompt>$ </prompt>nixos-version --hash
-0998212
-<prompt>$ </prompt>git checkout 0998212
-<prompt>$ </prompt>git checkout -b 'fix/pkg-name-update'
-</screen>
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        Please avoid working directly on the <command>master</command> branch.
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Make commits of logical units.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     If you removed pkgs or made some major NixOS changes, write about it in the release notes for the next stable release. For example <command>nixos/doc/manual/release-notes/rl-2003.xml</command>.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Check for unnecessary whitespace with <command>git diff --check</command> before committing.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Format the commit in a following way:
-    </para>
-<programlisting>
-(pkg-name | nixos/&lt;module>): (from -> to | init at version | refactor | etc)
-Additional information.
-</programlisting>
-    <itemizedlist>
-     <listitem>
-      <para>
-       Examples:
-       <itemizedlist>
-        <listitem>
-         <para>
-          <command>nginx: init at 2.0.1</command>
-         </para>
-        </listitem>
-        <listitem>
-         <para>
-          <command>firefox: 54.0.1 -> 55.0</command>
-         </para>
-        </listitem>
-        <listitem>
-         <para>
-          <command>nixos/hydra: add bazBaz option</command>
-         </para>
-        </listitem>
-        <listitem>
-         <para>
-          <command>nixos/nginx: refactor config generation</command>
-         </para>
-        </listitem>
-       </itemizedlist>
-      </para>
-     </listitem>
-    </itemizedlist>
-   </listitem>
-   <listitem>
-    <para>
-     Test your changes. If you work with
-     <itemizedlist>
-      <listitem>
-       <para>
-        nixpkgs:
-        <itemizedlist>
-         <listitem>
-          <para>
-           update pkg ->
-           <itemizedlist>
-            <listitem>
-             <para>
-              <command>nix-env -i pkg-name -f &lt;path to your local nixpkgs folder&gt;</command>
-             </para>
-            </listitem>
-           </itemizedlist>
-          </para>
-         </listitem>
-         <listitem>
-          <para>
-           add pkg ->
-           <itemizedlist>
-            <listitem>
-             <para>
-              Make sure it's in <command>pkgs/top-level/all-packages.nix</command>
-             </para>
-            </listitem>
-            <listitem>
-             <para>
-              <command>nix-env -i pkg-name -f &lt;path to your local nixpkgs folder&gt;</command>
-             </para>
-            </listitem>
-           </itemizedlist>
-          </para>
-         </listitem>
-         <listitem>
-          <para>
-           <emphasis>If you don't want to install pkg in you profile</emphasis>.
-           <itemizedlist>
-            <listitem>
-             <para>
-              <command>nix-build -A pkg-attribute-name &lt;path to your local nixpkgs folder&gt;/default.nix</command> and check results in the folder <command>result</command>. It will appear in the same directory where you did <command>nix-build</command>.
-             </para>
-            </listitem>
-           </itemizedlist>
-          </para>
-         </listitem>
-         <listitem>
-          <para>
-           If you did <command>nix-env -i pkg-name</command> you can do <command>nix-env -e pkg-name</command> to uninstall it from your system.
-          </para>
-         </listitem>
-        </itemizedlist>
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        NixOS and its modules:
-        <itemizedlist>
-         <listitem>
-          <para>
-           You can add new module to your NixOS configuration file (usually it's <command>/etc/nixos/configuration.nix</command>). And do <command>sudo nixos-rebuild test -I nixpkgs=&lt;path to your local nixpkgs folder&gt; --fast</command>.
-          </para>
-         </listitem>
-        </itemizedlist>
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     If you have commits <command>pkg-name: oh, forgot to insert whitespace</command>: squash commits in this case. Use <command>git rebase -i</command>.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     <link xlink:href="https://git-scm.com/book/en/v2/Git-Branching-Rebasing">Rebase</link> your branch against current <command>master</command>.
-    </para>
-   </listitem>
-  </itemizedlist>
- </section>
- <section xml:id="submitting-changes-submitting-changes">
-  <title>Submitting changes</title>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Push your changes to your fork of nixpkgs.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Create the pull request
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Follow <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/.github/CONTRIBUTING.md#submitting-changes">the contribution guidelines</link>.
-    </para>
-   </listitem>
-  </itemizedlist>
- </section>
- <section xml:id="submitting-changes-submitting-security-fixes">
-  <title>Submitting security fixes</title>
-
-  <para>
-   Security fixes are submitted in the same way as other changes and thus the same guidelines apply.
-  </para>
-
-  <para>
-   If the security fix comes in the form of a patch and a CVE is available, then the name of the patch should be the CVE identifier, so e.g. <literal>CVE-2019-13636.patch</literal> in the case of a patch that is included in the Nixpkgs tree. If a patch is fetched the name needs to be set as well, e.g.:
-  </para>
-
-<programlisting>
-   (fetchpatch {
-     name = "CVE-2019-11068.patch";
-     url = "https://gitlab.gnome.org/GNOME/libxslt/commit/e03553605b45c88f0b4b2980adfbbb8f6fca2fd6.patch";
-     sha256 = "0pkpb4837km15zgg6h57bncp66d5lwrlvkr73h0lanywq7zrwhj8";
-   })
-  </programlisting>
-
-  <para>
-   If a security fix applies to both master and a stable release then, similar to regular changes, they are preferably delivered via master first and cherry-picked to the release branch.
-  </para>
-
-  <para>
-   Critical security fixes may by-pass the staging branches and be delivered directly to release branches such as <literal>master</literal> and <literal>release-*</literal>.
-  </para>
- </section>
- <section xml:id="submitting-changes-pull-request-template">
-  <title>Pull Request Template</title>
-
-  <para>
-   The pull request template helps determine what steps have been made for a contribution so far, and will help guide maintainers on the status of a change. The motivation section of the PR should include any extra details the title does not address and link any existing issues related to the pull request.
-  </para>
-
-  <para>
-   When a PR is created, it will be pre-populated with some checkboxes detailed below:
-  </para>
-
-  <section xml:id="submitting-changes-tested-with-sandbox">
-   <title>Tested using sandboxing</title>
-
-   <para>
-    When sandbox builds are enabled, Nix will setup an isolated environment for each build process. It is used to remove further hidden dependencies set by the build environment to improve reproducibility. This includes access to the network during the build outside of <function>fetch*</function> functions and files outside the Nix store. Depending on the operating system access to other resources are blocked as well (ex. inter process communication is isolated on Linux); see <link
-      xlink:href="https://nixos.org/nix/manual/#conf-sandbox">sandbox</link> in Nix manual for details.
-   </para>
-
-   <para>
-    Sandboxing is not enabled by default in Nix due to a small performance hit on each build. In pull requests for <link
-        xlink:href="https://github.com/NixOS/nixpkgs/">nixpkgs</link> people are asked to test builds with sandboxing enabled (see <literal>Tested using sandboxing</literal> in the pull request template) because in<link
-        xlink:href="https://nixos.org/hydra/">https://nixos.org/hydra/</link> sandboxing is also used.
-   </para>
-
-   <para>
-    Depending if you use NixOS or other platforms you can use one of the following methods to enable sandboxing <emphasis role="bold">before</emphasis> building the package:
-    <itemizedlist>
-     <listitem>
-      <para>
-       <emphasis role="bold">Globally enable sandboxing on NixOS</emphasis>: add the following to <filename>configuration.nix</filename>
-<screen>nix.useSandbox = true;</screen>
-      </para>
-     </listitem>
-     <listitem>
-      <para>
-       <emphasis role="bold">Globally enable sandboxing on non-NixOS platforms</emphasis>: add the following to: <filename>/etc/nix/nix.conf</filename>
-<screen>sandbox = true</screen>
-      </para>
-     </listitem>
-    </itemizedlist>
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-platform-diversity">
-   <title>Built on platform(s)</title>
-
-   <para>
-    Many Nix packages are designed to run on multiple platforms. As such, it's important to let the maintainer know which platforms your changes have been tested on. It's not always practical to test a change on all platforms, and is not required for a pull request to be merged. Only check the systems you tested the build on in this section.
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-nixos-tests">
-   <title>Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)</title>
-
-   <para>
-    Packages with automated tests are much more likely to be merged in a timely fashion because it doesn't require as much manual testing by the maintainer to verify the functionality of the package. If there are existing tests for the package, they should be run to verify your changes do not break the tests. Tests only apply to packages with NixOS modules defined and can only be run on Linux. For more details on writing and running tests, see the <link
-        xlink:href="https://nixos.org/nixos/manual/index.html#sec-nixos-tests">section in the NixOS manual</link>.
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-tested-compilation">
-   <title>Tested compilation of all pkgs that depend on this change using <command>nixpkgs-review</command></title>
-
-   <para>
-    If you are updating a package's version, you can use nixpkgs-review to make sure all packages that depend on the updated package still compile correctly. The <command>nixpkgs-review</command> utility can look for and build all dependencies either based on uncommited changes with the <literal>wip</literal> option or specifying a github pull request number.
-   </para>
-
-   <para>
-    review changes from pull request number 12345:
-    <screen>nix run nixpkgs.nixpkgs-review -c nixpkgs-review pr 12345</screen>
-   </para>
-
-   <para>
-    review uncommitted changes:
-    <screen>nix run nixpkgs.nixpkgs-review -c nixpkgs-review wip</screen>
-   </para>
-
-   <para>
-    review changes from last commit:
-    <screen>nix run nixpkgs.nixpkgs-review -c nixpkgs-review rev HEAD</screen>
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-tested-execution">
-   <title>Tested execution of all binary files (usually in <filename>./result/bin/</filename>)</title>
-
-   <para>
-    It's important to test any executables generated by a build when you change or create a package in nixpkgs. This can be done by looking in <filename>./result/bin</filename> and running any files in there, or at a minimum, the main executable for the package. For example, if you make a change to <package>texlive</package>, you probably would only check the binaries associated with the change you made rather than testing all of them.
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-contribution-standards">
-   <title>Meets Nixpkgs contribution standards</title>
-
-   <para>
-    The last checkbox is fits <link
-        xlink:href="https://github.com/NixOS/nixpkgs/blob/master/.github/CONTRIBUTING.md">CONTRIBUTING.md</link>. The contributing document has detailed information on standards the Nix community has for commit messages, reviews, licensing of contributions you make to the project, etc... Everyone should read and understand the standards the community has for contributing before submitting a pull request.
-   </para>
-  </section>
- </section>
- <section xml:id="submitting-changes-hotfixing-pull-requests">
-  <title>Hotfixing pull requests</title>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Make the appropriate changes in you branch.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Don't create additional commits, do
-     <itemizedlist>
-      <listitem>
-       <para>
-        <command>git rebase -i</command>
-       </para>
-      </listitem>
-      <listitem>
-       <para>
-        <command>git push --force</command> to your branch.
-       </para>
-      </listitem>
-     </itemizedlist>
-    </para>
-   </listitem>
-  </itemizedlist>
- </section>
- <section xml:id="submitting-changes-commit-policy">
-  <title>Commit policy</title>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     Commits must be sufficiently tested before being merged, both for the master and staging branches.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Hydra builds for master and staging should not be used as testing platform, it's a build farm for changes that have been already tested.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     When changing the bootloader installation process, extra care must be taken. Grub installations cannot be rolled back, hence changes may break people's installations forever. For any non-trivial change to the bootloader please file a PR asking for review, especially from @edolstra.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <section xml:id="submitting-changes-master-branch">
-   <title>Master branch</title>
-   <para>
-    The <literal>master</literal> branch is the main development branch.
-    It should only see non-breaking commits that do not cause mass rebuilds.
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-staging-branch">
-   <title>Staging branch</title>
-   <para>
-    The <literal>staging</literal> branch is a development branch where mass-rebuilds go.
-    It should only see non-breaking mass-rebuild commits.
-    That means it is not to be used for testing, and changes must have been well tested already.
-    If the branch is already in a broken state, please refrain from adding extra new breakages.
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-staging-next-branch">
-   <title>Staging-next branch</title>
-   <para>
-    The <literal>staging-next</literal> branch is for stabilizing mass-rebuilds submitted to the <literal>staging</literal> branch prior to merging them into <literal>master</literal>.
-    Mass-rebuilds should go via the <literal>staging</literal> branch.
-    It should only see non-breaking commits that are fixing issues blocking it from being merged into the <literal>master </literal> branch.
-   </para>
-   <para>
-    If the branch is already in a broken state, please refrain from adding extra new breakages. Stabilize it for a few days and then merge into master.
-   </para>
-  </section>
-
-  <section xml:id="submitting-changes-stable-release-branches">
-   <title>Stable release branches</title>
-
-   <para>
-    For cherry-picking a commit to a stable release branch (<quote>backporting</quote>), use <literal>git cherry-pick -x &lt;original commit&gt;</literal> so that the original commit id is included in the commit.
-   </para>
-
-   <para>
-    Add a reason for the backport by using <literal>git cherry-pick -xe &lt;original commit&gt;</literal> instead when it is not obvious from the original commit message. It is not needed when it’s a minor version update that includes security and bug fixes but don’t add new features or when the commit fixes an otherwise broken package.
-   </para>
-
-   <para>
-    Here is an example of a cherry-picked commit message with good reason description:
-   </para>
-
-<screen>
-zfs: Keep trying root import until it works
-
-Works around #11003.
-
-(cherry picked from commit 98b213a11041af39b39473906b595290e2a4e2f9)
-
-Reason: several people cannot boot with ZFS on NVMe
-</screen>
-
-   <para>
-    Other examples of reasons are:
-   </para>
-
-   <itemizedlist spacing="compact">
-    <listitem>
-     <para>
-      Previously the build would fail due to, e.g., <literal>getaddrinfo</literal> not being defined
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      The previous download links were all broken
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      Crash when starting on some X11 systems
-     </para>
-    </listitem>
-   </itemizedlist>
-  </section>
- </section>
-</chapter>
--- a/doc/default.nix
+++ b/doc/default.nix
@ -1,28 +0,0 @@
-{ pkgs ? (import ./.. { }), nixpkgs ? { }}:
-let
-  lib = pkgs.lib;
-  doc-support = import ./doc-support { inherit pkgs nixpkgs; };
-in pkgs.stdenv.mkDerivation {
-  name = "nixpkgs-manual";
-
-  buildInputs = with pkgs; [ pandoc libxml2 libxslt zip jing  xmlformat ];
-
-  src = ./.;
-
-  postPatch = ''
-    ln -s ${doc-support} ./doc-support/result
-  '';
-
-  installPhase = ''
-    dest="$out/share/doc/nixpkgs"
-    mkdir -p "$(dirname "$dest")"
-    mv out/html "$dest"
-    mv "$dest/index.html" "$dest/manual.html"
-
-    mv out/epub/manual.epub "$dest/nixpkgs-manual.epub"
-
-    mkdir -p $out/nix-support/
-    echo "doc manual $dest manual.html" >> $out/nix-support/hydra-build-products
-    echo "doc manual $dest nixpkgs-manual.epub" >> $out/nix-support/hydra-build-products
-  '';
-}
--- a/doc/doc-support/default.nix
+++ b/doc/doc-support/default.nix
@ -1,45 +0,0 @@
-{ pkgs ? (import ../.. {}), nixpkgs ? { }}:
-let
-  locationsXml = import ./lib-function-locations.nix { inherit pkgs nixpkgs; };
-  functionDocs = import ./lib-function-docs.nix { inherit locationsXml pkgs; };
-  version = pkgs.lib.version;
-
-  epub-xsl = pkgs.writeText "epub.xsl" ''
-    <?xml version='1.0'?>
-    <xsl:stylesheet
-      xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-      version="1.0">
-      <xsl:import href="${pkgs.docbook_xsl_ns}/xml/xsl/docbook/epub/docbook.xsl" />
-      <xsl:import href="${./parameters.xml}"/>
-    </xsl:stylesheet>
-  '';
-
-  xhtml-xsl = pkgs.writeText "xhtml.xsl" ''
-    <?xml version='1.0'?>
-    <xsl:stylesheet
-      xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-      version="1.0">
-      <xsl:import href="${pkgs.docbook_xsl_ns}/xml/xsl/docbook/xhtml/docbook.xsl" />
-      <xsl:import href="${./parameters.xml}"/>
-    </xsl:stylesheet>
-  '';
-in pkgs.runCommand "doc-support" {}
-''
-  mkdir result
-  (
-    cd result
-    ln -s ${locationsXml} ./function-locations.xml
-    ln -s ${functionDocs} ./function-docs
-
-    ln -s ${pkgs.docbook5}/xml/rng/docbook/docbook.rng ./docbook.rng
-    ln -s ${pkgs.docbook_xsl_ns}/xml/xsl ./xsl
-    ln -s ${epub-xsl} ./epub.xsl
-    ln -s ${xhtml-xsl} ./xhtml.xsl
-
-    ln -s ${../../nixos/doc/xmlformat.conf} ./xmlformat.conf
-    ln -s ${pkgs.documentation-highlighter} ./highlightjs
-
-    echo -n "${version}" > ./version
-  )
-  mv result $out
-''
--- a/doc/doc-support/lib-function-docs.nix
+++ b/doc/doc-support/lib-function-docs.nix
@ -1,26 +0,0 @@
-# Generates the documentation for library functons via nixdoc. To add
-# another library function file to this list, the include list in the
-# file `doc/functions/library.xml` must also be updated.
-
-{ pkgs ? import ./.. {}, locationsXml }:
-
-with pkgs; stdenv.mkDerivation {
-  name = "nixpkgs-lib-docs";
-  src = ./../../lib;
-
-  buildInputs = [ nixdoc ];
-  installPhase = ''
-    function docgen {
-      nixdoc -c "$1" -d "$2" -f "../lib/$1.nix"  > "$out/$1.xml"
-    }
-
-    mkdir -p $out
-    ln -s ${locationsXml} $out/locations.xml
-
-    docgen strings 'String manipulation functions'
-    docgen trivial 'Miscellaneous functions'
-    docgen lists 'List manipulation functions'
-    docgen debug 'Debugging functions'
-    docgen options 'NixOS / nixpkgs option handling'
-  '';
-}
--- a/doc/doc-support/lib-function-locations.nix
+++ b/doc/doc-support/lib-function-locations.nix
@ -1,85 +0,0 @@
-{ pkgs ? (import ./.. { }), nixpkgs ? { }}:
-let
-  revision = pkgs.lib.trivial.revisionWithDefault (nixpkgs.revision or "master");
-
-  libDefPos = set:
-    builtins.map
-      (name: {
-        name = name;
-        location = builtins.unsafeGetAttrPos name set;
-      })
-      (builtins.attrNames set);
-
-  libset = toplib:
-    builtins.map
-      (subsetname: {
-        subsetname = subsetname;
-        functions = libDefPos toplib.${subsetname};
-      })
-      (builtins.filter
-        (name: builtins.isAttrs toplib.${name})
-        (builtins.attrNames toplib));
-
-  nixpkgsLib = pkgs.lib;
-
-  flattenedLibSubset = { subsetname, functions }:
-  builtins.map
-    (fn: {
-      name = "lib.${subsetname}.${fn.name}";
-      value = fn.location;
-    })
-    functions;
-
-  locatedlibsets = libs: builtins.map flattenedLibSubset (libset libs);
-  removeFilenamePrefix = prefix: filename:
-    let
-    prefixLen = (builtins.stringLength prefix) + 1; # +1 to remove the leading /
-      filenameLen = builtins.stringLength filename;
-      substr = builtins.substring prefixLen filenameLen filename;
-      in substr;
-
-  removeNixpkgs = removeFilenamePrefix (builtins.toString pkgs.path);
-
-  liblocations =
-    builtins.filter
-      (elem: elem.value != null)
-      (nixpkgsLib.lists.flatten
-        (locatedlibsets nixpkgsLib));
-
-  fnLocationRelative = { name, value }:
-    {
-      inherit name;
-      value = value // { file = removeNixpkgs value.file; };
-    };
-
-  relativeLocs = (builtins.map fnLocationRelative liblocations);
-  sanitizeId = builtins.replaceStrings
-    [ "'"      ]
-    [ "-prime" ];
-
-  urlPrefix = "https://github.com/NixOS/nixpkgs/blob/${revision}";
-  xmlstrings = (nixpkgsLib.strings.concatMapStrings
-      ({ name, value }:
-      ''
-      <section><title>${name}</title>
-        <para xml:id="${sanitizeId name}">
-        Located at
-        <link
-          xlink:href="${urlPrefix}/${value.file}#L${builtins.toString value.line}">${value.file}:${builtins.toString value.line}</link>
-        in  <literal>&lt;nixpkgs&gt;</literal>.
-        </para>
-        </section>
-      '')
-      relativeLocs);
-
-in pkgs.writeText
-    "locations.xml"
-    ''
-    <section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         version="5">
-         <title>All the locations for every lib function</title>
-         <para>This file is only for inclusion by other files.</para>
-         ${xmlstrings}
-    </section>
-    ''
--- a/doc/doc-support/parameters.xml
+++ b/doc/doc-support/parameters.xml
@ -1,14 +0,0 @@
-<?xml version='1.0'?>
-<xsl:stylesheet
-    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-    version="1.0">
- <xsl:param name="section.autolabel" select="1" />
- <xsl:param name="section.label.includes.component.label" select="1" />
- <xsl:param name="html.stylesheet" select="'style.css overrides.css highlightjs/mono-blue.css'" />
- <xsl:param name="html.script" select="'./highlightjs/highlight.pack.js ./highlightjs/loader.js'" />
- <xsl:param name="xref.with.number.and.title" select="1" />
- <xsl:param name="use.id.as.filename" select="1" />
- <xsl:param name="toc.section.depth" select="0" />
- <xsl:param name="admon.style" select="''" />
- <xsl:param name="callout.graphics.extension" select="'.svg'" />
-</xsl:stylesheet>
--- a/doc/functions.xml
+++ b/doc/functions.xml
@ -1,14 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-functions">
- <title>Functions reference</title>
- <para>
-  The nixpkgs repository has several utility functions to manipulate Nix expressions.
- </para>
- <xi:include href="functions/library.xml" />
- <xi:include href="functions/generators.xml" />
- <xi:include href="functions/debug.xml" />
- <xi:include href="functions/prefer-remote-fetch.xml" />
- <xi:include href="functions/nix-gitignore.xml" />
-</chapter>
--- a/doc/functions/debug.xml
+++ b/doc/functions/debug.xml
@ -1,14 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-debug">
- <title>Debugging Nix Expressions</title>
-
- <para>
-  Nix is a unityped, dynamic language, this means every value can potentially appear anywhere. Since it is also non-strict, evaluation order and what ultimately is evaluated might surprise you. Therefore it is important to be able to debug nix expressions.
- </para>
-
- <para>
-  In the <literal>lib/debug.nix</literal> file you will find a number of functions that help (pretty-)printing values while evaluation is runnnig. You can even specify how deep these values should be printed recursively, and transform them on the fly. Please consult the docstrings in <literal>lib/debug.nix</literal> for usage information.
- </para>
-</section>
--- a/doc/functions/generators.xml
+++ b/doc/functions/generators.xml
@ -1,74 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-generators">
- <title>Generators</title>
-
- <para>
-  Generators are functions that create file formats from nix data structures, e. g. for configuration files. There are generators available for: <literal>INI</literal>, <literal>JSON</literal> and <literal>YAML</literal>
- </para>
-
- <para>
-  All generators follow a similar call interface: <code>generatorName configFunctions data</code>, where <literal>configFunctions</literal> is an attrset of user-defined functions that format nested parts of the content. They each have common defaults, so often they do not need to be set manually. An example is <code>mkSectionName ? (name: libStr.escape [ "[" "]" ] name)</code> from the <literal>INI</literal> generator. It receives the name of a section and sanitizes it. The default <literal>mkSectionName</literal> escapes <literal>[</literal> and <literal>]</literal> with a backslash.
- </para>
-
- <para>
-  Generators can be fine-tuned to produce exactly the file format required by your application/service. One example is an INI-file format which uses <literal>: </literal> as separator, the strings <literal>"yes"</literal>/<literal>"no"</literal> as boolean values and requires all string values to be quoted:
- </para>
-
-<programlisting>
-with lib;
-let
-  customToINI = generators.toINI {
-    # specifies how to format a key/value pair
-    mkKeyValue = generators.mkKeyValueDefault {
-      # specifies the generated string for a subset of nix values
-      mkValueString = v:
-             if v == true then ''"yes"''
-        else if v == false then ''"no"''
-        else if isString v then ''"${v}"''
-        # and delegats all other values to the default generator
-        else generators.mkValueStringDefault {} v;
-    } ":";
-  };
-
-# the INI file can now be given as plain old nix values
-in customToINI {
-  main = {
-    pushinfo = true;
-    autopush = false;
-    host = "localhost";
-    port = 42;
-  };
-  mergetool = {
-    merge = "diff3";
-  };
-}
-</programlisting>
-
- <para>
-  This will produce the following INI file as nix string:
- </para>
-
-<programlisting>
-[main]
-autopush:"no"
-host:"localhost"
-port:42
-pushinfo:"yes"
-str\:ange:"very::strange"
-
-[mergetool]
-merge:"diff3"
-</programlisting>
-
- <note>
-  <para>
-   Nix store paths can be converted to strings by enclosing a derivation attribute like so: <code>"${drv}"</code>.
-  </para>
- </note>
-
- <para>
-  Detailed documentation for each generator can be found in <literal>lib/generators.nix</literal>.
- </para>
-</section>
--- a/doc/functions/library.xml
+++ b/doc/functions/library.xml
@ -1,28 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-functions-library">
- <title>Nixpkgs Library Functions</title>
-
- <para>
-  Nixpkgs provides a standard library at <varname>pkgs.lib</varname>, or through <code>import &lt;nixpkgs/lib&gt;</code>.
- </para>
-
- <xi:include href="./library/asserts.xml" />
-
- <xi:include href="./library/attrsets.xml" />
-
-<!-- These docs are generated via nixdoc. To add another generated
-      library function file to this list, the file
-      `lib-function-docs.nix` must also be updated. -->
-
- <xi:include href="./library/generated/strings.xml" />
-
- <xi:include href="./library/generated/trivial.xml" />
-
- <xi:include href="./library/generated/lists.xml" />
-
- <xi:include href="./library/generated/debug.xml" />
-
- <xi:include href="./library/generated/options.xml" />
-</section>
--- a/doc/functions/library/asserts.xml
+++ b/doc/functions/library/asserts.xml
@ -1,112 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-functions-library-asserts">
- <title>Assert functions</title>
-
- <section xml:id="function-library-lib.asserts.assertMsg">
-  <title><function>lib.asserts.assertMsg</function></title>
-
-  <subtitle><literal>assertMsg :: Bool -> String -> Bool</literal>
-  </subtitle>
-
-  <xi:include href="./locations.xml" xpointer="lib.asserts.assertMsg" />
-
-  <para>
-   Print a trace message if <literal>pred</literal> is false.
-  </para>
-
-  <para>
-   Intended to be used to augment asserts with helpful error messages.
-  </para>
-
-  <variablelist>
-   <varlistentry>
-    <term>
-     <varname>pred</varname>
-    </term>
-    <listitem>
-     <para>
-      Condition under which the <varname>msg</varname> should <emphasis>not</emphasis> be printed.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>msg</varname>
-    </term>
-    <listitem>
-     <para>
-      Message to print.
-     </para>
-    </listitem>
-   </varlistentry>
-  </variablelist>
-
-  <example xml:id="function-library-lib.asserts.assertMsg-example-false">
-   <title>Printing when the predicate is false</title>
-<programlisting><![CDATA[
-assert lib.asserts.assertMsg ("foo" == "bar") "foo is not bar, silly"
-stderr> trace: foo is not bar, silly
-stderr> assert failed
-]]></programlisting>
-  </example>
- </section>
-
- <section xml:id="function-library-lib.asserts.assertOneOf">
-  <title><function>lib.asserts.assertOneOf</function></title>
-
-  <subtitle><literal>assertOneOf :: String -> String ->
-      StringList -> Bool</literal>
-  </subtitle>
-
-  <xi:include href="./locations.xml" xpointer="lib.asserts.assertOneOf" />
-
-  <para>
-   Specialized <function>asserts.assertMsg</function> for checking if <varname>val</varname> is one of the elements of <varname>xs</varname>. Useful for checking enums.
-  </para>
-
-  <variablelist>
-   <varlistentry>
-    <term>
-     <varname>name</varname>
-    </term>
-    <listitem>
-     <para>
-      The name of the variable the user entered <varname>val</varname> into, for inclusion in the error message.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>val</varname>
-    </term>
-    <listitem>
-     <para>
-      The value of what the user provided, to be compared against the values in <varname>xs</varname>.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <varname>xs</varname>
-    </term>
-    <listitem>
-     <para>
-      The list of valid values.
-     </para>
-    </listitem>
-   </varlistentry>
-  </variablelist>
-
-  <example xml:id="function-library-lib.asserts.assertOneOf-example">
-   <title>Ensuring a user provided a possible value</title>
-<programlisting><![CDATA[
-let sslLibrary = "bearssl";
-in lib.asserts.assertOneOf "sslLibrary" sslLibrary [ "openssl" "bearssl" ];
-=> false
-stderr> trace: sslLibrary must be one of "openssl", "libressl", but is: "bearssl"
-        ]]></programlisting>
-  </example>
- </section>
-</section>
--- a/doc/functions/library/attrsets.xml
+++ b/doc/functions/library/attrsets.xml
--- a/doc/functions/nix-gitignore.xml
+++ b/doc/functions/nix-gitignore.xml
@ -1,70 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-pkgs-nix-gitignore">
- <title>pkgs.nix-gitignore</title>
-
- <para>
-  <function>pkgs.nix-gitignore</function> is a function that acts similarly to <literal>builtins.filterSource</literal> but also allows filtering with the help of the gitignore format.
- </para>
-
- <section xml:id="sec-pkgs-nix-gitignore-usage">
-  <title>Usage</title>
-
-  <para>
-   <literal>pkgs.nix-gitignore</literal> exports a number of functions, but you'll most likely need either <literal>gitignoreSource</literal> or <literal>gitignoreSourcePure</literal>. As their first argument, they both accept either 1. a file with gitignore lines or 2. a string with gitignore lines, or 3. a list of either of the two. They will be concatenated into a single big string.
-  </para>
-
-<programlisting><![CDATA[
-{ pkgs ? import <nixpkgs> {} }:
-
- nix-gitignore.gitignoreSource [] ./source
-     # Simplest version
-
- nix-gitignore.gitignoreSource "supplemental-ignores\n" ./source
-     # This one reads the ./source/.gitignore and concats the auxiliary ignores
-
- nix-gitignore.gitignoreSourcePure "ignore-this\nignore-that\n" ./source
-     # Use this string as gitignore, don't read ./source/.gitignore.
-
- nix-gitignore.gitignoreSourcePure ["ignore-this\nignore-that\n", ~/.gitignore] ./source
-     # It also accepts a list (of strings and paths) that will be concatenated
-     # once the paths are turned to strings via readFile.
-  ]]></programlisting>
-
-  <para>
-   These functions are derived from the <literal>Filter</literal> functions by setting the first filter argument to <literal>(_: _: true)</literal>:
-  </para>
-
-<programlisting><![CDATA[
-gitignoreSourcePure = gitignoreFilterSourcePure (_: _: true);
-gitignoreSource = gitignoreFilterSource (_: _: true);
-  ]]></programlisting>
-
-  <para>
-   Those filter functions accept the same arguments the <literal>builtins.filterSource</literal> function would pass to its filters, thus <literal>fn: gitignoreFilterSourcePure fn ""</literal> should be extensionally equivalent to <literal>filterSource</literal>. The file is blacklisted iff it's blacklisted by either your filter or the gitignoreFilter.
-  </para>
-
-  <para>
-   If you want to make your own filter from scratch, you may use
-  </para>
-
-<programlisting><![CDATA[
-gitignoreFilter = ign: root: filterPattern (gitignoreToPatterns ign) root;
-  ]]></programlisting>
- </section>
-
- <section xml:id="sec-pkgs-nix-gitignore-usage-recursive">
-  <title>gitignore files in subdirectories</title>
-
-  <para>
-   If you wish to use a filter that would search for .gitignore files in subdirectories, just like git does by default, use this function:
-  </para>
-
-<programlisting><![CDATA[
-gitignoreFilterRecursiveSource = filter: patterns: root:
-# OR
-gitignoreRecursiveSource = gitignoreFilterSourcePure (_: _: true);
-  ]]></programlisting>
- </section>
-</section>
--- a/doc/functions/prefer-remote-fetch.xml
+++ b/doc/functions/prefer-remote-fetch.xml
@ -1,21 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/xinclude"
-         xml:id="sec-prefer-remote-fetch">
- <title>prefer-remote-fetch overlay</title>
-
- <para>
-  <function>prefer-remote-fetch</function> is an overlay that download sources on remote builder. This is useful when the evaluating machine has a slow upload while the builder can fetch faster directly from the source. To use it, put the following snippet as a new overlay:
-<programlisting>
-self: super:
-  (super.prefer-remote-fetch self super)
-</programlisting>
-  A full configuration example for that sets the overlay up for your own account, could look like this
-<screen>
-<prompt>$ </prompt>mkdir ~/.config/nixpkgs/overlays/
-<prompt>$ </prompt>cat &gt; ~/.config/nixpkgs/overlays/prefer-remote-fetch.nix &lt;&lt;EOF
-  self: super: super.prefer-remote-fetch self super
-EOF
-</screen>
- </para>
-</section>
--- a/doc/introduction.xml
+++ b/doc/introduction.xml
@ -0,0 +1,21 @@
+<chapter xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xml:id="chap-introduction">
+
+<title>Introduction</title>
+
+<para>This manual tells you how to write packages for the Nix Packages
+collection (Nixpkgs).  Thus it’s for packagers and developers who want
+to add packages to Nixpkgs.  End users are kindly referred to the
+<link xlink:href="http://hydra.nixos.org/job/nix/trunk/tarball/latest/download-by-type/doc/manual">Nix
+manual</link>.</para>
+
+<para>This manual does not describe the syntax and semantics of the
+Nix expression language, which are given in the Nix manual in the
+<link
+xlink:href="http://hydra.nixos.org/job/nix/trunk/tarball/latest/download-by-type/doc/manual/#chap-writing-nix-expressions">chapter
+on writing Nix expressions</link>.  It only describes the facilities
+provided by Nixpkgs to make writing packages easier, such as the
+standard build environment (<literal>stdenv</literal>).</para>
+
+</chapter>
--- a/doc/language-support.xml
+++ b/doc/language-support.xml
@ -0,0 +1,333 @@
+<chapter xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xml:id="chap-language-support">
+
+<title>Support for specific programming languages</title>
+
+<para>The <link linkend="chap-stdenv">standard build
+environment</link> makes it easy to build typical Autotools-based
+packages with very little code.  Any other kind of package can be
+accomodated by overriding the appropriate phases of
+<literal>stdenv</literal>.  However, there are specialised functions
+in Nixpkgs to easily build packages for other programming languages,
+such as Perl or Haskell.  These are described in this chapter.</para>
+
+
+<section xml:id="ssec-language-perl"><title>Perl</title>
+
+<para>Nixpkgs provides a function <varname>buildPerlPackage</varname>,
+a generic package builder function for any Perl package that has a
+standard <varname>Makefile.PL</varname>.  It’s implemented in <link
+xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/perl-modules/generic"><filename>pkgs/development/perl-modules/generic</filename></link>.</para>
+
+<para>Perl packages from CPAN are defined in <link
+xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/perl-packages.nix"><filename>pkgs/top-level/perl-packages.nix</filename></link>,
+rather than <filename>pkgs/all-packages.nix</filename>.  Most Perl
+packages are so straight-forward to build that they are defined here
+directly, rather than having a separate function for each package
+called from <filename>perl-packages.nix</filename>.  However, more
+complicated packages should be put in a separate file, typically in
+<filename>pkgs/development/perl-modules</filename>.  Here is an
+example of the former:
+
+<programlisting>
+ClassC3 = buildPerlPackage rec {
+  name = "Class-C3-0.21";
+  src = fetchurl {
+    url = "mirror://cpan/authors/id/F/FL/FLORA/${name}.tar.gz";
+    sha256 = "1bl8z095y4js66pwxnm7s853pi9czala4sqc743fdlnk27kq94gz";
+  };
+};
+</programlisting>
+
+Note the use of <literal>mirror://cpan/</literal>, and the
+<literal>${name}</literal> in the URL definition to ensure that the
+name attribute is consistent with the source that we’re actually
+downloading.  Perl packages are made available in
+<filename>all-packages.nix</filename> through the variable
+<varname>perlPackages</varname>.  For instance, if you have a package
+that needs <varname>ClassC3</varname>, you would typically write
+
+<programlisting>
+foo = import ../path/to/foo.nix {
+  inherit stdenv fetchurl ...;
+  inherit (perlPackages) ClassC3;
+};
+</programlisting>
+
+in <filename>all-packages.nix</filename>.  You can test building a
+Perl package as follows:
+
+<screen>
+$ nix-build -A perlPackages.ClassC3
+</screen>
+
+<varname>buildPerlPackage</varname> adds <literal>perl-</literal> to
+the start of the name attribute, so the package above is actually
+called <literal>perl-Class-C3-0.21</literal>.  So to install it, you
+can say:
+
+<screen>
+$ nix-env -i perl-Class-C3
+</screen>
+
+(Of course you can also install using the attribute name:
+<literal>nix-env -i -A perlPackages.ClassC3</literal>.)</para>
+
+<para>So what does <varname>buildPerlPackage</varname> do?  It does
+the following:
+
+<orderedlist>
+
+  <listitem><para>In the configure phase, it calls <literal>perl
+  Makefile.PL</literal> to generate a Makefile.  You can set the
+  variable <varname>makeMakerFlags</varname> to pass flags to
+  <filename>Makefile.PL</filename></para></listitem>
+
+  <listitem><para>It adds the contents of the <envar>PERL5LIB</envar>
+  environment variable to <literal>#! .../bin/perl</literal> line of
+  Perl scripts as <literal>-I<replaceable>dir</replaceable></literal>
+  flags.  This ensures that a script can find its
+  dependencies.</para></listitem>
+
+  <listitem><para>In the fixup phase, it writes the propagated build
+  inputs (<varname>propagatedBuildInputs</varname>) to the file
+  <filename>$out/nix-support/propagated-user-env-packages</filename>.
+  <command>nix-env</command> recursively installs all packages listed
+  in this file when you install a package that has it.  This ensures
+  that a Perl package can find its dependencies.</para></listitem>
+
+</orderedlist>
+
+</para>
+
+<para><varname>buildPerlPackage</varname> is built on top of
+<varname>stdenv</varname>, so everything can be customised in the
+usual way.  For instance, the <literal>BerkeleyDB</literal> module has
+a <varname>preConfigure</varname> hook to generate a configuration
+file used by <filename>Makefile.PL</filename>:
+
+<programlisting>
+{buildPerlPackage, fetchurl, db}:
+
+buildPerlPackage rec {
+  name = "BerkeleyDB-0.36";
+
+  src = fetchurl {
+    url = "mirror://cpan/authors/id/P/PM/PMQS/${name}.tar.gz";
+    sha256 = "07xf50riarb60l1h6m2dqmql8q5dij619712fsgw7ach04d8g3z1";
+  };
+
+  preConfigure = ''
+    echo "LIB = ${db}/lib" > config.in
+    echo "INCLUDE = ${db}/include" >> config.in
+  '';
+}
+</programlisting>
+
+</para>
+
+<para>Dependencies on other Perl packages can be specified in the
+<varname>buildInputs</varname> and
+<varname>propagatedBuildInputs</varname> attributes.  If something is
+exclusively a build-time dependency, use
+<varname>buildInputs</varname>; if it’s (also) a runtime dependency,
+use <varname>propagatedBuildInputs</varname>.  For instance, this
+builds a Perl module that has runtime dependencies on a bunch of other
+modules:
+
+<programlisting>
+ClassC3Componentised = buildPerlPackage rec {
+  name = "Class-C3-Componentised-1.0004";
+  src = fetchurl {
+    url = "mirror://cpan/authors/id/A/AS/ASH/${name}.tar.gz";
+    sha256 = "0xql73jkcdbq4q9m0b0rnca6nrlvf5hyzy8is0crdk65bynvs8q1";
+  };
+  propagatedBuildInputs = [
+    ClassC3 ClassInspector TestException MROCompat
+  ];
+};
+</programlisting>
+
+</para>
+
+<section><title>Generation from CPAN</title>
+
+<para>Nix expressions for Perl packages can be generated (almost)
+automatically from CPAN.  This is done by the program
+<command>nix-generate-from-cpan</command>, which can be installed
+as follows:</para>
+
+<screen>
+$ nix-env -i nix-generate-from-cpan
+</screen>
+
+<para>This program takes a Perl module name, looks it up on CPAN,
+fetches and unpacks the corresponding package, and prints a Nix
+expression on standard output.  For example:
+
+<screen>
+$ nix-generate-from-cpan XML::Simple
+  XMLSimple = buildPerlPackage {
+    name = "XML-Simple-2.20";
+    src = fetchurl {
+      url = mirror://cpan/authors/id/G/GR/GRANTM/XML-Simple-2.20.tar.gz;
+      sha256 = "5cff13d0802792da1eb45895ce1be461903d98ec97c9c953bc8406af7294434a";
+    };
+    propagatedBuildInputs = [ XMLNamespaceSupport XMLSAX XMLSAXExpat ];
+    meta = {
+      description = "Easily read/write XML (esp config files)";
+      license = "perl";
+    };
+  };
+</screen>
+
+The output can be pasted into
+<filename>pkgs/top-level/perl-packages.nix</filename> or wherever else
+you need it.</para>
+
+</section>
+
+</section>
+
+
+<section><title>Python</title>
+
+<para>
+  Python packages that
+  use <link xlink:href="http://pypi.python.org/pypi/setuptools/"><literal>setuptools</literal></link>,
+  which many Python packages do nowadays, can be built very simply using
+  the <varname>buildPythonPackage</varname> function.  This function is
+  implemented
+  in <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/python-modules/generic/default.nix"><filename>pkgs/development/python-modules/generic/default.nix</filename></link>
+  and works similarly to <varname>buildPerlPackage</varname>. (See
+  <xref linkend="ssec-language-perl"/> for details.)
+</para>
+
+<para>
+  Python packages that use <varname>buildPythonPackage</varname> are
+  defined
+  in <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/python-packages.nix"><filename>pkgs/top-level/python-packages.nix</filename></link>.
+  Most of them are simple.  For example:
+
+  <programlisting>
+twisted = buildPythonPackage {
+  name = "twisted-8.1.0";
+
+  src = fetchurl {
+    url = http://tmrc.mit.edu/mirror/twisted/Twisted/8.1/Twisted-8.1.0.tar.bz2;
+    sha256 = "0q25zbr4xzknaghha72mq57kh53qw1bf8csgp63pm9sfi72qhirl";
+  };
+
+  propagatedBuildInputs = [ pkgs.ZopeInterface ];
+
+  meta = {
+    homepage = http://twistedmatrix.com/;
+    description = "Twisted, an event-driven networking engine written in Python";
+    license = "MIT";
+  };
+};
+  </programlisting>
+</para>
+
+</section>
+
+
+<section xml:id="ssec-language-java"><title>Java</title>
+
+<para>Ant-based Java packages are typically built from source as follows:
+
+<programlisting>
+stdenv.mkDerivation {
+  name = "...";
+  src = fetchurl { ... };
+
+  buildInputs = [ jdk ant ];
+
+  buildPhase = "ant";
+}
+</programlisting>
+
+Note that <varname>jdk</varname> is an alias for the OpenJDK.</para>
+
+<para>JAR files that are intended to be used by other packages should
+be installed in <filename>$out/share/java</filename>.  The OpenJDK has
+a stdenv setup hook that adds any JARs in the
+<filename>share/java</filename> directories of the build inputs to the
+<envar>CLASSPATH</envar> environment variable.  For instance, if the
+package <literal>libfoo</literal> installs a JAR named
+<filename>foo.jar</filename> in its <filename>share/java</filename>
+directory, and another package declares the attribute
+
+<programlisting>
+buildInputs = [ jdk libfoo ];
+</programlisting>
+
+then <envar>CLASSPATH</envar> will be set to
+<filename>/nix/store/...-libfoo/share/java/foo.jar</filename>.</para>
+
+<para>Private JARs
+should be installed in a location like
+<filename>$out/share/<replaceable>package-name</replaceable></filename>.</para>
+
+<para>If your Java package provides a program, you need to generate a
+wrapper script to run it using the OpenJRE.  You can use
+<literal>makeWrapper</literal> for this:
+
+<programlisting>
+buildInputs = [ makeWrapper ];
+
+installPhase =
+  ''
+    mkdir -p $out/bin
+    makeWrapper ${jre}/bin/java $out/bin/foo \
+      --add-flags "-cp $out/share/java/foo.jar org.foo.Main"
+  '';
+</programlisting>
+
+Note the use of <literal>jre</literal>, which is the part of the
+OpenJDK package that contains the Java Runtime Environment.  By using
+<literal>${jre}/bin/java</literal> instead of
+<literal>${jdk}/bin/java</literal>, you prevent your package from
+depending on the JDK at runtime.</para>
+
+<para>It is possible to use a different Java compiler than
+<command>javac</command> from the OpenJDK.  For instance, to use the
+Eclipse Java Compiler:
+
+<programlisting>
+buildInputs = [ jre ant ecj ];
+</programlisting>
+
+(Note that here you don’t need the full JDK as an input, but just the
+JRE.)  The ECJ has a stdenv setup hook that sets some environment
+variables to cause Ant to use ECJ, but this doesn’t work with all Ant
+files.  Similarly, you can use the GNU Java Compiler:
+
+<programlisting>
+buildInputs = [ gcj ant ];
+</programlisting>
+
+Here, Ant will automatically use <command>gij</command> (the GNU Java
+Runtime) instead of the OpenJRE.</para>
+
+</section>
+
+
+<!--
+<section><title>Haskell</title>
+
+<para>TODO</para>
+
+</section>
+
+
+<section><title>TeX / LaTeX</title>
+
+<para>* Special support for building TeX documents</para>
+
+</section>
+-->
+
+
+</chapter>
--- a/doc/languages-frameworks/agda.section.md
+++ b/doc/languages-frameworks/agda.section.md
@ -1,96 +0,0 @@
---
-title: Agda
-author: Alex Rice (alexarice)
-date: 2020-01-06
---
-# Agda
-
-## How to use Agda
-
-Agda can be installed from `agda`:
-```
-$ nix-env -iA agda
-```
-
-To use agda with libraries, the `agda.withPackages` function can be used. This function either takes:
-+ A list of packages,
-+ or a function which returns a list of packages when given the `agdaPackages` attribute set,
-+ or an attribute set containing a list of packages and a GHC derivation for compilation (see below).
-
-For example, suppose we wanted a version of agda which has access to the standard library. This can be obtained with the expressions:
-
-```
-agda.withPackages [ agdaPackages.standard-library ]
-```
-
-or
-
-```
-agda.withPackages (p: [ p.standard-library ])
-```
-
-or can be called as in the [Compiling Agda](#compiling-agda) section.
-
-If you want to use a library in your home directory (for instance if it is a development version) then typecheck it manually (using `agda.withPackages` if necessary) and then override the `src` attribute of the package to point to your local repository.
-
-Agda will not by default use these libraries. To tell agda to use the library we have some options:
- Call `agda` with the library flag:
-```
-$ agda -l standard-library -i . MyFile.agda
-```
- Write a `my-library.agda-lib` file for the project you are working on which may look like:
-```
-name: my-library
-include: .
-depend: standard-library
-```
- Create the file `~/.agda/defaults` and add any libraries you want to use by default.
-
-More information can be found in the [official Agda documentation on library management](https://agda.readthedocs.io/en/v2.6.1/tools/package-system.html).
-
-## Compiling Agda
-Agda modules can be compiled with the `--compile` flag. A version of `ghc` with `ieee` is made available to the Agda program via the `--with-compiler` flag.
-This can be overridden by a different version of `ghc` as follows:
-
-```
-agda.withPackages {
-  pkgs = [ ... ];
-  ghc = haskell.compiler.ghcHEAD;
-}
-```
-
-## Writing Agda packages
-To write a nix derivation for an agda library, first check that the library has a `*.agda-lib` file.
-
-A derivation can then be written using `agdaPackages.mkDerivation`. This has similar arguments to `stdenv.mkDerivation` with the following additions:
-+ `everythingFile` can be used to specify the location of the `Everything.agda` file, defaulting to `./Everything.agda`. If this file does not exist then either it should be patched in or the `buildPhase` should be overridden (see below).
-+ `libraryName` should be the name that appears in the `*.agda-lib` file, defaulting to `pname`.
-+ `libraryFile` should be the file name of the `*.agda-lib` file, defaulting to `${libraryName}.agda-lib`.
-
-The build phase for `agdaPackages.mkDerivation` simply runs `agda` on the `Everything.agda` file. If something else is needed to build the package (e.g. `make`) then the `buildPhase` should be overridden (or a `preBuild` or `configurePhase` can be used if there are steps that need to be done prior to checking the `Everything.agda` file). `agda` and the Agda libraries contained in `buildInputs` are made available during the build phase. The install phase simply copies all `.agda`, `.agdai` and `.agda-lib` files to the output directory. Again, this can be overridden.
-
-To add an agda package to `nixpkgs`, the derivation should be written to `pkgs/development/libraries/agda/${library-name}/` and an entry should be added to `pkgs/top-level/agda-packages.nix`. Here it is called in a scope with access to all other agda libraries, so the top line of the `default.nix` can look like:
-```
-{ mkDerivation, standard-library, fetchFromGitHub }:
-```
-and `mkDerivation` should be called instead of `agdaPackages.mkDerivation`. Here is an example skeleton derivation for iowa-stdlib:
-
-```
-mkDerivation {
-  version = "1.5.0";
-  pname = "iowa-stdlib";
-
-  src = ...
-
-  libraryFile = "";
-  libraryName = "IAL-1.3";
-
-  buildPhase = ''
-    patchShebangs find-deps.sh
-    make
-  '';
-}
-```
-This library has a file called `.agda-lib`, and so we give an empty string to `libraryFile` as nothing precedes `.agda-lib` in the filename. This file contains `name: IAL-1.3`, and so we let `libraryName =  "IAL-1.3"`. This library does not use an `Everything.agda` file and instead has a Makefile, so there is no need to set `everythingFile` and we set a custom `buildPhase`.
-
-When writing an agda package it is essential to make sure that no `.agda-lib` file gets added to the store as a single file (for example by using `writeText`). This causes agda to think that the nix store is a agda library and it will attempt to write to it whenever it typechecks something. See [https://github.com/agda/agda/issues/4613](https://github.com/agda/agda/issues/4613).
--- a/doc/languages-frameworks/android.section.md
+++ b/doc/languages-frameworks/android.section.md
@ -1,239 +0,0 @@
---
-title: Android
-author: Sander van der Burg
-date: 2018-11-18
---
-# Android
-
-The Android build environment provides three major features and a number of
-supporting features.
-
-Deploying an Android SDK installation with plugins
--------------------------------------------------
-The first use case is deploying the SDK with a desired set of plugins or subsets
-of an SDK.
-
-```nix
-with import <nixpkgs> {};
-
-let
-  androidComposition = androidenv.composeAndroidPackages {
-    toolsVersion = "25.2.5";
-    platformToolsVersion = "27.0.1";
-    buildToolsVersions = [ "27.0.3" ];
-    includeEmulator = false;
-    emulatorVersion = "27.2.0";
-    platformVersions = [ "24" ];
-    includeSources = false;
-    includeDocs = false;
-    includeSystemImages = false;
-    systemImageTypes = [ "default" ];
-    abiVersions = [ "armeabi-v7a" ];
-    lldbVersions = [ "2.0.2558144" ];
-    cmakeVersions = [ "3.6.4111459" ];
-    includeNDK = false;
-    ndkVersion = "16.1.4479499";
-    useGoogleAPIs = false;
-    useGoogleTVAddOns = false;
-    includeExtras = [
-      "extras;google;gcm"
-    ];
-  };
-in
-androidComposition.androidsdk
-```
-
-The above function invocation states that we want an Android SDK with the above
-specified plugin versions. By default, most plugins are disabled. Notable
-exceptions are the tools, platform-tools and build-tools sub packages.
-
-The following parameters are supported:
-
-* `toolsVersion`, specifies the version of the tools package to use
-* `platformsToolsVersion` specifies the version of the `platform-tools` plugin
-* `buildToolsVersion` specifies the versions of the `build-tools` plugins to
-  use.
-* `includeEmulator` specifies whether to deploy the emulator package (`false`
-  by default). When enabled, the version of the emulator to deploy can be
-  specified by setting the `emulatorVersion` parameter.
-* `includeDocs` specifies whether the documentation catalog should be included.
-* `lldbVersions` specifies what LLDB versions should be deployed.
-* `cmakeVersions` specifies which CMake versions should be deployed.
-* `includeNDK` specifies that the Android NDK bundle should be included.
-  Defaults to: `false`.
-* `ndkVersion` specifies the NDK version that we want to use.
-* `includeExtras` is an array of identifier strings referring to arbitrary
-  add-on packages that should be installed.
-* `platformVersions` specifies which platform SDK versions should be included.
-
-For each platform version that has been specified, we can apply the following
-options:
-
-* `includeSystemImages` specifies whether a system image for each platform SDK
-  should be included.
-* `includeSources` specifies whether the sources for each SDK version should be
-  included.
-* `useGoogleAPIs` specifies that for each selected platform version the
-  Google API should be included.
-* `useGoogleTVAddOns` specifies that for each selected platform version the
-  Google TV add-on should be included.
-
-For each requested system image we can specify the following options:
-
-* `systemImageTypes` specifies what kind of system images should be included.
-  Defaults to: `default`.
-* `abiVersions` specifies what kind of ABI version of each system image should
-  be included. Defaults to: `armeabi-v7a`.
-
-Most of the function arguments have reasonable default settings.
-
-When building the above expression with:
-
-```bash
-$ nix-build
-```
-
-The Android SDK gets deployed with all desired plugin versions.
-
-We can also deploy subsets of the Android SDK. For example, to only the
-`platform-tools` package, you can evaluate the following expression:
-
-```nix
-with import <nixpkgs> {};
-
-let
-  androidComposition = androidenv.composeAndroidPackages {
-    # ...
-  };
-in
-androidComposition.platform-tools
-```
-
-Using predefine Android package compositions
--------------------------------------------
-In addition to composing an Android package set manually, it is also possible
-to use a predefined composition that contains all basic packages for a specific
-Android version, such as version 9.0 (API-level 28).
-
-The following Nix expression can be used to deploy the entire SDK with all basic
-plugins:
-
-```nix
-with import <nixpkgs> {};
-
-androidenv.androidPkgs_9_0.androidsdk
-```
-
-It is also possible to use one plugin only:
-
-```nix
-with import <nixpkgs> {};
-
-androidenv.androidPkgs_9_0.platform-tools
-```
-
-Building an Android application
-------------------------------
-In addition to the SDK, it is also possible to build an Ant-based Android
-project and automatically deploy all the Android plugins that a project
-requires.
-
-```nix
-with import <nixpkgs> {};
-
-androidenv.buildApp {
-  name = "MyAndroidApp";
-  src = ./myappsources;
-  release = true;
-
-  # If release is set to true, you need to specify the following parameters
-  keyStore = ./keystore;
-  keyAlias = "myfirstapp";
-  keyStorePassword = "mykeystore";
-  keyAliasPassword = "myfirstapp";
-
-  # Any Android SDK parameters that install all the relevant plugins that a
-  # build requires
-  platformVersions = [ "24" ];
-
-  # When we include the NDK, then ndk-build is invoked before Ant gets invoked
-  includeNDK = true;
-}
-```
-
-Aside from the app-specific build parameters (`name`, `src`, `release` and
-keystore parameters), the `buildApp {}` function supports all the function
-parameters that the SDK composition function (the function shown in the
-previous section) supports.
-
-This build function is particularly useful when it is desired to use
-[Hydra](https://nixos.org/hydra): the Nix-based continuous integration solution
-to build Android apps. An Android APK gets exposed as a build product and can be
-installed on any Android device with a web browser by navigating to the build
-result page.
-
-Spawning emulator instances
---------------------------
-For testing purposes, it can also be quite convenient to automatically generate
-scripts that spawn emulator instances with all desired configuration settings.
-
-An emulator spawn script can be configured by invoking the `emulateApp {}`
-function:
-
-```nix
-with import <nixpkgs> {};
-
-androidenv.emulateApp {
-  name = "emulate-MyAndroidApp";
-  platformVersion = "28";
-  abiVersion = "x86"; # armeabi-v7a, mips, x86_64
-  systemImageType = "google_apis_playstore";
-}
-```
-
-It is also possible to specify an APK to deploy inside the emulator
-and the package and activity names to launch it:
-
-```nix
-with import <nixpkgs> {};
-
-androidenv.emulateApp {
-  name = "emulate-MyAndroidApp";
-  platformVersion = "24";
-  abiVersion = "armeabi-v7a"; # mips, x86, x86_64
-  systemImageType = "default";
-  useGoogleAPIs = false;
-  app = ./MyApp.apk;
-  package = "MyApp";
-  activity = "MainActivity";
-}
-```
-
-In addition to prebuilt APKs, you can also bind the APK parameter to a
-`buildApp {}` function invocation shown in the previous example.
-
-Querying the available versions of each plugin
----------------------------------------------
-When using any of the previously shown functions, it may be a bit inconvenient
-to find out what options are supported, since the Android SDK provides many
-plugins.
-
-A shell script in the `pkgs/development/mobile/androidenv/` sub directory can be used to retrieve all
-possible options:
-
-```bash
-sh ./querypackages.sh packages build-tools
-```
-
-The above command-line instruction queries all build-tools versions in the
-generated `packages.nix` expression.
-
-Updating the generated expressions
----------------------------------
-Most of the Nix expressions are generated from XML files that the Android
-package manager uses. To update the expressions run the `generate.sh` script
-that is stored in the `pkgs/development/mobile/androidenv/` sub directory:
-
-```bash
-./generate.sh
-```
--- a/doc/languages-frameworks/beam.xml
+++ b/doc/languages-frameworks/beam.xml
@ -1,159 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-beam">
- <title>BEAM Languages (Erlang, Elixir &amp; LFE)</title>
-
- <section xml:id="beam-introduction">
-  <title>Introduction</title>
-
-  <para>
-   In this document and related Nix expressions, we use the term, <emphasis>BEAM</emphasis>, to describe the environment. BEAM is the name of the Erlang Virtual Machine and, as far as we're concerned, from a packaging perspective, all languages that run on the BEAM are interchangeable. That which varies, like the build system, is transparent to users of any given BEAM package, so we make no distinction.
-  </para>
- </section>
-
- <section xml:id="beam-structure">
-  <title>Structure</title>
-
-  <para>
-   All BEAM-related expressions are available via the top-level <literal>beam</literal> attribute, which includes:
-  </para>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     <literal>interpreters</literal>: a set of compilers running on the BEAM, including multiple Erlang/OTP versions (<literal>beam.interpreters.erlangR19</literal>, etc), Elixir (<literal>beam.interpreters.elixir</literal>) and LFE (<literal>beam.interpreters.lfe</literal>).
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     <literal>packages</literal>: a set of package builders (Mix and rebar3), each compiled with a specific Erlang/OTP version, e.g. <literal>beam.packages.erlangR19</literal>.
-    </para>
-   </listitem>
-  </itemizedlist>
-
-  <para>
-   The default Erlang compiler, defined by <literal>beam.interpreters.erlang</literal>, is aliased as <literal>erlang</literal>. The default BEAM package set is defined by <literal>beam.packages.erlang</literal> and aliased at the top level as <literal>beamPackages</literal>.
-  </para>
-
-  <para>
-   To create a package builder built with a custom Erlang version, use the lambda, <literal>beam.packagesWith</literal>, which accepts an Erlang/OTP derivation and produces a package builder similar to <literal>beam.packages.erlang</literal>.
-  </para>
-
-  <para>
-   Many Erlang/OTP distributions available in <literal>beam.interpreters</literal> have versions with ODBC and/or Java enabled or without wx (no observer support). For example, there's <literal>beam.interpreters.erlangR22_odbc_javac</literal>, which corresponds to <literal>beam.interpreters.erlangR22</literal> and <literal>beam.interpreters.erlangR22_nox</literal>, which corresponds to <literal>beam.interpreters.erlangR22</literal>.
-  </para>
- </section>
-
- <section xml:id="build-tools">
-  <title>Build Tools</title>
-
-  <section xml:id="build-tools-rebar3">
-   <title>Rebar3</title>
-
-   <para>
-    We provide a version of Rebar3, under <literal>rebar3</literal>. We also provide a helper to fetch Rebar3 dependencies from a lockfile under <literal>fetchRebar3Deps</literal>.
-   </para>
-  </section>
-
-  <section xml:id="build-tools-other">
-   <title>Mix &amp; Erlang.mk</title>
-
-   <para>
-    Both Mix and Erlang.mk work exactly as expected. There is a bootstrap process that needs to be run for both, however, which is supported by the <literal>buildMix</literal> and <literal>buildErlangMk</literal> derivations, respectively.
-   </para>
-  </section>
- </section>
-
- <section xml:id="how-to-install-beam-packages">
-  <title>How to Install BEAM Packages</title>
-
-  <para>
-   BEAM builders are not registered at the top level, simply because they are not relevant to the vast majority of Nix users. 
-   To install any of those builders into your profile, refer to them by their attribute path <literal>beamPackages.rebar3</literal>:
-  </para>
-
-  <screen>
-  <prompt>$ </prompt>nix-env -f &quot;&lt;nixpkgs&gt;&quot; -iA beamPackages.rebar3
-  </screen>
-</section>
-
- <section xml:id="packaging-beam-applications">
-  <title>Packaging BEAM Applications</title>
-
-  <section  xml:id="packaging-erlang-applications">
-   <title>Erlang Applications</title>
-
-   <section xml:id="rebar3-packages">
-    <title>Rebar3 Packages</title>
-
-    <para>
-     The Nix function, <literal>buildRebar3</literal>, defined in <literal>beam.packages.erlang.buildRebar3</literal> and aliased at the top level, can be used to build a derivation that understands how to build a Rebar3 project.
-    </para>
-
-    <para>
-     If a package needs to compile native code via Rebar3's port compilation mechanism, add <literal>compilePort = true;</literal> to the derivation.
-    </para>
-   </section>
-
-   <section xml:id="erlang-mk-packages">
-    <title>Erlang.mk Packages</title>
-
-    <para>
-     Erlang.mk functions similarly to Rebar3, except we use <literal>buildErlangMk</literal> instead of <literal>buildRebar3</literal>.
-    </para>
-
-   </section>
-
-   <section xml:id="mix-packages">
-    <title>Mix Packages</title>
-
-    <para>
-     Mix functions similarly to Rebar3, except we use <literal>buildMix</literal> instead of <literal>buildRebar3</literal>.
-    </para>
-
-    <para>
-     Alternatively, we can use <literal>buildHex</literal> as a shortcut:
-    </para>
-   </section>
-  </section>
- </section>
-
- <section xml:id="how-to-develop">
-  <title>How to Develop</title>
-
-  <section xml:id="creating-a-shell">
-   <title>Creating a Shell</title>
-
-  <para>
-    Usually, we need to create a <literal>shell.nix</literal> file and do our development inside of the environment specified therein. Just install your version of erlang and other interpreter, and then user your normal build tools.
-    As an example with elixir:
-  </para>
-
-<programlisting>
-{ pkgs ? import &quot;&lt;nixpkgs&quot;&gt; {} }:
-
-with pkgs;
-
-let
-
-  elixir = beam.packages.erlangR22.elixir_1_9;
-
-in
-mkShell {
-  buildInputs = [ elixir ];
-
-  ERL_INCLUDE_PATH="${erlang}/lib/erlang/usr/include";
-}
-</programlisting>
-
-   <section xml:id="building-in-a-shell">
-    <title>Building in a Shell (for Mix Projects)</title>
-
-    <para>
-     Using a <literal>shell.nix</literal> as described (see <xref
-      linkend="creating-a-shell"/>) should just work.
-    </para>
-   </section>
-  </section>
- </section>
-</section>
--- a/doc/languages-frameworks/bower.xml
+++ b/doc/languages-frameworks/bower.xml
@ -1,196 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-bower">
- <title>Bower</title>
-
- <para>
-  <link xlink:href="http://bower.io">Bower</link> is a package manager for web site front-end components. Bower packages (comprising of build artefacts and sometimes sources) are stored in <command>git</command> repositories, typically on Github. The package registry is run by the Bower team with package metadata coming from the <filename>bower.json</filename> file within each package.
- </para>
-
- <para>
-  The end result of running Bower is a <filename>bower_components</filename> directory which can be included in the web app's build process.
- </para>
-
- <para>
-  Bower can be run interactively, by installing <varname>nodePackages.bower</varname>. More interestingly, the Bower components can be declared in a Nix derivation, with the help of <varname>nodePackages.bower2nix</varname>.
- </para>
-
- <section xml:id="ssec-bower2nix-usage">
-  <title><command>bower2nix</command> usage</title>
-
-  <para>
-   Suppose you have a <filename>bower.json</filename> with the following contents:
-   <example xml:id="ex-bowerJson">
-    <title><filename>bower.json</filename></title>
-<programlisting language="json">
-<![CDATA[{
-  "name": "my-web-app",
-  "dependencies": {
-    "angular": "~1.5.0",
-    "bootstrap": "~3.3.6"
-  }
-}]]>
-</programlisting>
-   </example>
-  </para>
-
-  <para>
-   Running <command>bower2nix</command> will produce something like the following output:
-<programlisting language="nix">
-<![CDATA[{ fetchbower, buildEnv }:
-buildEnv { name = "bower-env"; ignoreCollisions = true; paths = [
-  (fetchbower "angular" "1.5.3" "~1.5.0" "1749xb0firxdra4rzadm4q9x90v6pzkbd7xmcyjk6qfza09ykk9y")
-  (fetchbower "bootstrap" "3.3.6" "~3.3.6" "1vvqlpbfcy0k5pncfjaiskj3y6scwifxygfqnw393sjfxiviwmbv")
-  (fetchbower "jquery" "2.2.2" "1.9.1 - 2" "10sp5h98sqwk90y4k6hbdviwqzvzwqf47r3r51pakch5ii2y7js1")
-]; }]]>
-</programlisting>
-  </para>
-
-  <para>
-   Using the <command>bower2nix</command> command line arguments, the output can be redirected to a file. A name like <filename>bower-packages.nix</filename> would be fine.
-  </para>
-
-  <para>
-   The resulting derivation is a union of all the downloaded Bower packages (and their dependencies). To use it, they still need to be linked together by Bower, which is where <varname>buildBowerComponents</varname> is useful.
-  </para>
- </section>
-
- <section xml:id="ssec-build-bower-components">
-  <title><varname>buildBowerComponents</varname> function</title>
-
-  <para>
-   The function is implemented in <link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/bower-modules/generic/default.nix"> <filename>pkgs/development/bower-modules/generic/default.nix</filename></link>. Example usage:
-   <example xml:id="ex-buildBowerComponents">
-    <title>buildBowerComponents</title>
-<programlisting language="nix">
-bowerComponents = buildBowerComponents {
-  name = "my-web-app";
-  generated = ./bower-packages.nix; <co xml:id="ex-buildBowerComponents-1" />
-  src = myWebApp; <co xml:id="ex-buildBowerComponents-2" />
-};
-</programlisting>
-   </example>
-  </para>
-
-  <para>
-   In <xref linkend="ex-buildBowerComponents" />, the following arguments are of special significance to the function:
-   <calloutlist>
-    <callout arearefs="ex-buildBowerComponents-1">
-     <para>
-      <varname>generated</varname> specifies the file which was created by <command>bower2nix</command>.
-     </para>
-    </callout>
-    <callout arearefs="ex-buildBowerComponents-2">
-     <para>
-      <varname>src</varname> is your project's sources. It needs to contain a <filename>bower.json</filename> file.
-     </para>
-    </callout>
-   </calloutlist>
-  </para>
-
-  <para>
-   <varname>buildBowerComponents</varname> will run Bower to link together the output of <command>bower2nix</command>, resulting in a <filename>bower_components</filename> directory which can be used.
-  </para>
-
-  <para>
-   Here is an example of a web frontend build process using <command>gulp</command>. You might use <command>grunt</command>, or anything else.
-  </para>
-
-  <example xml:id="ex-bowerGulpFile">
-   <title>Example build script (<filename>gulpfile.js</filename>)</title>
-<programlisting language="javascript">
-<![CDATA[var gulp = require('gulp');
-
-gulp.task('default', [], function () {
-  gulp.start('build');
-});
-
-gulp.task('build', [], function () {
-  console.log("Just a dummy gulp build");
-  gulp
-    .src(["./bower_components/**/*"])
-    .pipe(gulp.dest("./gulpdist/"));
-});]]>
-</programlisting>
-  </example>
-
-  <example xml:id="ex-buildBowerComponentsDefaultNix">
-   <title>Full example — <filename>default.nix</filename></title>
-<programlisting language="nix">
-{ myWebApp ? { outPath = ./.; name = "myWebApp"; }
-, pkgs ? import &lt;nixpkgs&gt; {}
-}:
-
-pkgs.stdenv.mkDerivation {
-  name = "my-web-app-frontend";
-  src = myWebApp;
-
-  buildInputs = [ pkgs.nodePackages.gulp ];
-
-  bowerComponents = pkgs.buildBowerComponents { <co xml:id="ex-buildBowerComponentsDefault-1" />
-    name = "my-web-app";
-    generated = ./bower-packages.nix;
-    src = myWebApp;
-  };
-
-  buildPhase = ''
-    cp --reflink=auto --no-preserve=mode -R $bowerComponents/bower_components . <co xml:id="ex-buildBowerComponentsDefault-2" />
-    export HOME=$PWD <co xml:id="ex-buildBowerComponentsDefault-3" />
-    ${pkgs.nodePackages.gulp}/bin/gulp build <co xml:id="ex-buildBowerComponentsDefault-4" />
-  '';
-
-  installPhase = "mv gulpdist $out";
-}
-</programlisting>
-  </example>
-
-  <para>
-   A few notes about <xref linkend="ex-buildBowerComponentsDefaultNix" />:
-   <calloutlist>
-    <callout arearefs="ex-buildBowerComponentsDefault-1">
-     <para>
-      The result of <varname>buildBowerComponents</varname> is an input to the frontend build.
-     </para>
-    </callout>
-    <callout arearefs="ex-buildBowerComponentsDefault-2">
-     <para>
-      Whether to symlink or copy the <filename>bower_components</filename> directory depends on the build tool in use. In this case a copy is used to avoid <command>gulp</command> silliness with permissions.
-     </para>
-    </callout>
-    <callout arearefs="ex-buildBowerComponentsDefault-3">
-     <para>
-      <command>gulp</command> requires <varname>HOME</varname> to refer to a writeable directory.
-     </para>
-    </callout>
-    <callout arearefs="ex-buildBowerComponentsDefault-4">
-     <para>
-      The actual build command. Other tools could be used.
-     </para>
-    </callout>
-   </calloutlist>
-  </para>
- </section>
-
- <section xml:id="ssec-bower2nix-troubleshooting">
-  <title>Troubleshooting</title>
-
-  <variablelist>
-   <varlistentry>
-    <term>
-     <literal>ENOCACHE</literal> errors from <varname>buildBowerComponents</varname>
-    </term>
-    <listitem>
-     <para>
-      This means that Bower was looking for a package version which doesn't exist in the generated <filename>bower-packages.nix</filename>.
-     </para>
-     <para>
-      If <filename>bower.json</filename> has been updated, then run <command>bower2nix</command> again.
-     </para>
-     <para>
-      It could also be a bug in <command>bower2nix</command> or <command>fetchbower</command>. If possible, try reformulating the version specification in <filename>bower.json</filename>.
-     </para>
-    </listitem>
-   </varlistentry>
-  </variablelist>
- </section>
-</section>
--- a/doc/languages-frameworks/coq.xml
+++ b/doc/languages-frameworks/coq.xml
@ -1,52 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-language-coq">
- <title>Coq</title>
-
- <para>
-  Coq libraries should be installed in <literal>$(out)/lib/coq/${coq.coq-version}/user-contrib/</literal>. Such directories are automatically added to the <literal>$COQPATH</literal> environment variable by the hook defined in the Coq derivation.
- </para>
-
- <para>
-  Some extensions (plugins) might require OCaml and sometimes other OCaml packages. The <literal>coq.ocamlPackages</literal> attribute can be used to depend on the same package set Coq was built against.
- </para>
-
- <para>
-  Coq libraries may be compatible with some specific versions of Coq only. The <literal>compatibleCoqVersions</literal> attribute is used to precisely select those versions of Coq that are compatible with this derivation.
- </para>
-
- <para>
-  Here is a simple package example. It is a pure Coq library, thus it depends on Coq. It builds on the Mathematical Components library, thus it also takes <literal>mathcomp</literal> as <literal>buildInputs</literal>. Its <literal>Makefile</literal> has been generated using <literal>coq_makefile</literal> so we only have to set the <literal>$COQLIB</literal> variable at install time.
- </para>
-
-<programlisting>
-{ stdenv, fetchFromGitHub, coq, mathcomp }:
-
-stdenv.mkDerivation rec {
-  name = "coq${coq.coq-version}-multinomials-${version}";
-  version = "1.0";
-  src = fetchFromGitHub {
-    owner = "math-comp";
-    repo = "multinomials";
-    rev = version;
-    sha256 = "1qmbxp1h81cy3imh627pznmng0kvv37k4hrwi2faa101s6bcx55m";
-  };
-
-  buildInputs = [ coq ];
-  propagatedBuildInputs = [ mathcomp ];
-
-  installFlags = "COQLIB=$(out)/lib/coq/${coq.coq-version}/";
-
-  meta = {
-    description = "A Coq/SSReflect Library for Monoidal Rings and Multinomials";
-    inherit (src.meta) homepage;
-    license = stdenv.lib.licenses.cecill-b;
-    inherit (coq.meta) platforms;
-  };
-
-  passthru = {
-    compatibleCoqVersions = v: builtins.elem v [ "8.5" "8.6" "8.7" ];
-  };
-}
-</programlisting>
-</section>
--- a/doc/languages-frameworks/crystal.section.md
+++ b/doc/languages-frameworks/crystal.section.md
@ -1,71 +0,0 @@
-# Crystal
-
-## Building a Crystal package
-
-This section uses [Mint](https://github.com/mint-lang/mint) as an example for how to build a Crystal package.
-
-If the Crystal project has any dependencies, the first step is to get a `shards.nix` file encoding those. Get a copy of the project and go to its root directory such that its `shard.lock` file is in the current directory, then run `crystal2nix` in it
-```bash
-$ git clone https://github.com/mint-lang/mint
-$ cd mint
-$ git checkout 0.5.0
-$ nix-shell -p crystal2nix --run crystal2nix
-```
-
-This should have generated a `shards.nix` file.
-
-Next create a Nix file for your derivation and use `pkgs.crystal.buildCrystalPackage` as follows:
-```nix
-with import <nixpkgs> {};
-crystal.buildCrystalPackage rec {
-  pname = "mint";
-  version = "0.5.0";
-
-  src = fetchFromGitHub {
-    owner = "mint-lang";
-    repo = "mint";
-    rev = version;
-    sha256 = "0vxbx38c390rd2ysvbwgh89v2232sh5rbsp3nk9wzb70jybpslvl";
-  };
-
-  # Insert the path to your shards.nix file here
-  shardsFile = ./shards.nix;
-
-  ...
-}
-```
-
-This won't build anything yet, because we haven't told it what files build. We can specify a mapping from binary names to source files with the `crystalBinaries` attribute. The project's compilation instructions should show this. For Mint, the binary is called "mint", which is compiled from the source file `src/mint.cr`, so we'll specify this as follows:
-
-```nix
-  crystalBinaries.mint.src = "src/mint.cr";
-
-  # ...
-```
-
-Additionally you can override the default `crystal build` options (which are currently `--release --progress --no-debug --verbose`) with
-
-```nix
-  crystalBinaries.mint.options = [ "--release" "--verbose" ];
-```
-
-Depending on the project, you might need additional steps to get it to compile successfully. In Mint's case, we need to link against openssl, so in the end the Nix file looks as follows:
-
-```nix
-with import <nixpkgs> {};
-crystal.buildCrystalPackage rec {
-  version = "0.5.0";
-  pname = "mint";
-  src = fetchFromGitHub {
-    owner = "mint-lang";
-    repo = "mint";
-    rev = version;
-    sha256 = "0vxbx38c390rd2ysvbwgh89v2232sh5rbsp3nk9wzb70jybpslvl";
-  };
-
-  shardsFile = ./shards.nix;
-  crystalBinaries.mint.src = "src/mint.cr";
-
-  buildInputs = [ openssl ];
-}
-```
--- a/doc/languages-frameworks/dotnet.section.md
+++ b/doc/languages-frameworks/dotnet.section.md
@ -1,75 +0,0 @@
-# Dotnet
-
-## Local Development Workflow
-
-For local development, it's recommended to use nix-shell to create a dotnet environment:
-
-```
-# shell.nix
-with import <nixpkgs> {};
-
-mkShell {
-  name = "dotnet-env";
-  buildInputs = [
-    dotnet-sdk_3
-  ];
-}
-```
-
-### Using many sdks in a workflow
-
-It's very likely that more than one sdk will be needed on a given project. Dotnet provides several different frameworks (E.g dotnetcore, aspnetcore, etc.) as well as many versions for a given framework. Normally, dotnet is able to fetch a framework and install it relative to the executable. However, this would mean writing to the nix store in nixpkgs, which is read-only. To support the many-sdk use case, one can compose an environment using `dotnetCorePackages.combinePackages`:
-
-```
-with import <nixpkgs> {};
-
-mkShell {
-  name = "dotnet-env";
-  buildInputs = [
-    (with dotnetCorePackages; combinePackages [
-      sdk_3_1
-      sdk_3_0
-      sdk_2_1
-    ])
-  ];
-}
-```
-
-This will produce a dotnet installation that has the dotnet 3.1, 3.0, and 2.1 sdk. The first sdk listed will have it's cli utility present in the resulting environment. Example info output:
-
-```
-$ dotnet --info
-.NET Core SDK (reflecting any global.json):
- Version:   3.1.101
- Commit:    b377529961
-
-...
-
-.NET Core SDKs installed:
-  2.1.803 [/nix/store/iiv98i2jdi226dgh4jzkkj2ww7f8jgpd-dotnet-core-combined/sdk]
-  3.0.102 [/nix/store/iiv98i2jdi226dgh4jzkkj2ww7f8jgpd-dotnet-core-combined/sdk]
-  3.1.101 [/nix/store/iiv98i2jdi226dgh4jzkkj2ww7f8jgpd-dotnet-core-combined/sdk]
-
-.NET Core runtimes installed:
-  Microsoft.AspNetCore.All 2.1.15 [/nix/store/iiv98i2jdi226dgh4jzkkj2ww7f8jgpd-dotnet-core-combined/shared/Microsoft.AspNetCore.All]
-  Microsoft.AspNetCore.App 2.1.15 [/nix/store/iiv98i2jdi226dgh4jzkkj2ww7f8jgpd-dotnet-core-combined/shared/Microsoft.AspNetCore.App]
-  Microsoft.AspNetCore.App 3.0.2 [/nix/store/iiv98i2jdi226dgh4jzkkj2ww7f8jgpd-dotnet-core-combined/shared/Microsoft.AspNetCore.App]
-  Microsoft.AspNetCore.App 3.1.1 [/nix/store/iiv98i2jdi226dgh4jzkkj2ww7f8jgpd-dotnet-core-combined/shared/Microsoft.AspNetCore.App]
-  Microsoft.NETCore.App 2.1.15 [/nix/store/iiv98i2jdi226dgh4jzkkj2ww7f8jgpd-dotnet-core-combined/shared/Microsoft.NETCore.App]
-  Microsoft.NETCore.App 3.0.2 [/nix/store/iiv98i2jdi226dgh4jzkkj2ww7f8jgpd-dotnet-core-combined/shared/Microsoft.NETCore.App]
-  Microsoft.NETCore.App 3.1.1 [/nix/store/iiv98i2jdi226dgh4jzkkj2ww7f8jgpd-dotnet-core-combined/shared/Microsoft.NETCore.App]
-```
-
-## dotnet-sdk vs dotnetCorePackages.sdk
-
-The `dotnetCorePackages.sdk_X_Y` is preferred over the old dotnet-sdk as both major and minor version are very important for a dotnet environment. If a given minor version isn't present (or was changed), then this will likely break your ability to build a project.
-
-## dotnetCorePackages.sdk vs dotnetCorePackages.netcore vs dotnetCorePackages.aspnetcore
-
-The `dotnetCorePackages.sdk` contains both a runtime and the full sdk of a given version. The `netcore` and `aspnetcore` packages are meant to serve as minimal runtimes to deploy alongside already built applications.
-
-## Packaging a Dotnet Application
-
-Ideally, we would like to build against the sdk, then only have the dotnet runtime available in the runtime closure.
-
-TODO: Create closure-friendly way to package dotnet applications
--- a/doc/languages-frameworks/emscripten.section.md
+++ b/doc/languages-frameworks/emscripten.section.md
@ -1,185 +0,0 @@
-# Emscripten
-
-[Emscripten](https://github.com/kripken/emscripten): An LLVM-to-JavaScript Compiler
-
-This section of the manual covers how to use `emscripten` in nixpkgs.
-
-Minimal requirements:
-
-* nix
-* nixpkgs
-
-Modes of use of `emscripten`:
-
-* **Imperative usage** (on the command line):
-
-   If you want to work with `emcc`, `emconfigure` and `emmake` as you are used to from Ubuntu and similar distributions you can use these commands:
-
-    * `nix-env -i emscripten`
-    * `nix-shell -p emscripten`
-
-* **Declarative usage**:
-
-    This mode is far more power full since this makes use of `nix` for dependency management of emscripten libraries and targets by using the `mkDerivation` which is implemented by `pkgs.emscriptenStdenv` and `pkgs.buildEmscriptenPackage`. The source for the packages is in `pkgs/top-level/emscripten-packages.nix` and the abstraction behind it in `pkgs/development/em-modules/generic/default.nix`.
-    * build and install all packages: 
-        * `nix-env -iA emscriptenPackages` 
-          
-    * dev-shell for zlib implementation hacking: 
-        * `nix-shell -A emscriptenPackages.zlib` 
-
-
-## Imperative usage
-
-A few things to note:
-
-* `export EMCC_DEBUG=2` is nice for debugging
-* `~/.emscripten`, the build artifact cache sometimes creates issues and needs to be removed from time to time
-
-
-## Declarative usage
-
-Let's see two different examples from `pkgs/top-level/emscripten-packages.nix`:
-
-* `pkgs.zlib.override`
-* `pkgs.buildEmscriptenPackage`
-
-Both are interesting concepts.
-
-A special requirement of the `pkgs.buildEmscriptenPackage` is the `doCheck = true` is a default meaning that each emscriptenPackage requires a `checkPhase` implemented.
-
-* Use `export EMCC_DEBUG=2` from within a emscriptenPackage's `phase` to get more detailed debug output what is going wrong.
-* ~/.emscripten cache is requiring us to set `HOME=$TMPDIR` in individual phases. This makes compilation slower but also makes it more deterministic.
-
-### Usage 1: pkgs.zlib.override
-
-This example uses `zlib` from nixpkgs but instead of compiling **C** to **ELF** it compiles **C** to **JS** since we were using `pkgs.zlib.override` and changed stdenv to `pkgs.emscriptenStdenv`. A few adaptions and hacks were set in place to make it working. One advantage is that when `pkgs.zlib` is updated, it will automatically update this package as well. However, this can also be the downside...
-
-See the `zlib` example:
-
-    zlib = (pkgs.zlib.override {
-      stdenv = pkgs.emscriptenStdenv;
-    }).overrideDerivation
-    (old: rec {
-      buildInputs = old.buildInputs ++ [ pkgconfig ];
-      # we need to reset this setting!
-      NIX_CFLAGS_COMPILE="";
-      configurePhase = ''
-        # FIXME: Some tests require writing at $HOME
-        HOME=$TMPDIR
-        runHook preConfigure
-
-        #export EMCC_DEBUG=2
-        emconfigure ./configure --prefix=$out --shared
-
-        runHook postConfigure
-      '';
-      dontStrip = true;
-      outputs = [ "out" ];
-      buildPhase = ''
-        emmake make
-      '';
-      installPhase = ''
-        emmake make install
-      '';
-      checkPhase = ''
-        echo "================= testing zlib using node ================="
-
-        echo "Compiling a custom test"
-        set -x
-        emcc -O2 -s EMULATE_FUNCTION_POINTER_CASTS=1 test/example.c -DZ_SOLO \
-        libz.so.${old.version} -I . -o example.js
-
-        echo "Using node to execute the test"
-        ${pkgs.nodejs}/bin/node ./example.js 
-
-        set +x
-        if [ $? -ne 0 ]; then
-          echo "test failed for some reason"
-          exit 1;
-        else
-          echo "it seems to work! very good."
-        fi
-        echo "================= /testing zlib using node ================="
-      '';
-
-      postPatch = pkgs.stdenv.lib.optionalString pkgs.stdenv.isDarwin ''
-        substituteInPlace configure \
-          --replace '/usr/bin/libtool' 'ar' \
-          --replace 'AR="libtool"' 'AR="ar"' \
-          --replace 'ARFLAGS="-o"' 'ARFLAGS="-r"'
-      '';
-    });
-
-### Usage 2: pkgs.buildEmscriptenPackage
-
-This `xmlmirror` example features a emscriptenPackage which is defined completely from this context and no `pkgs.zlib.override` is used. 
-
-    xmlmirror = pkgs.buildEmscriptenPackage rec {
-      name = "xmlmirror";
-
-      buildInputs = [ pkgconfig autoconf automake libtool gnumake libxml2 nodejs openjdk json_c ];
-      nativeBuildInputs = [ pkgconfig zlib ];
-
-      src = pkgs.fetchgit {
-        url = "https://gitlab.com/odfplugfest/xmlmirror.git";
-        rev = "4fd7e86f7c9526b8f4c1733e5c8b45175860a8fd";
-        sha256 = "1jasdqnbdnb83wbcnyrp32f36w3xwhwp0wq8lwwmhqagxrij1r4b";
-      };
-
-      configurePhase = ''
-        rm -f fastXmlLint.js*
-        # a fix for ERROR:root:For asm.js, TOTAL_MEMORY must be a multiple of 16MB, was 234217728
-        # https://gitlab.com/odfplugfest/xmlmirror/issues/8
-        sed -e "s/TOTAL_MEMORY=234217728/TOTAL_MEMORY=268435456/g" -i Makefile.emEnv
-        # https://github.com/kripken/emscripten/issues/6344
-        # https://gitlab.com/odfplugfest/xmlmirror/issues/9
-        sed -e "s/\$(JSONC_LDFLAGS) \$(ZLIB_LDFLAGS) \$(LIBXML20_LDFLAGS)/\$(JSONC_LDFLAGS) \$(LIBXML20_LDFLAGS) \$(ZLIB_LDFLAGS) /g" -i Makefile.emEnv
-        # https://gitlab.com/odfplugfest/xmlmirror/issues/11
-        sed -e "s/-o fastXmlLint.js/-s EXTRA_EXPORTED_RUNTIME_METHODS='[\"ccall\", \"cwrap\"]' -o fastXmlLint.js/g" -i Makefile.emEnv
-      '';
-
-      buildPhase = ''
-        HOME=$TMPDIR
-        make -f Makefile.emEnv
-      '';
-
-      outputs = [ "out" "doc" ];
-
-      installPhase = ''
-        mkdir -p $out/share
-        mkdir -p $doc/share/${name}
-
-        cp Demo* $out/share
-        cp -R codemirror-5.12 $out/share
-        cp fastXmlLint.js* $out/share
-        cp *.xsd $out/share
-        cp *.js $out/share
-        cp *.xhtml $out/share
-        cp *.html $out/share
-        cp *.json $out/share
-        cp *.rng $out/share
-        cp README.md $doc/share/${name}
-      '';
-      checkPhase = ''
-
-      '';
-    }; 
-
-### Declarative debugging
-
-Use `nix-shell -I nixpkgs=/some/dir/nixpkgs -A emscriptenPackages.libz` and from there you can go trough the individual steps. This makes it easy to build a good `unit test` or list the files of the project.
-
-1. `nix-shell -I nixpkgs=/some/dir/nixpkgs -A emscriptenPackages.libz`
-2. `cd /tmp/`
-3. `unpackPhase`
-4. cd libz-1.2.3
-5. `configurePhase`
-6. `buildPhase`
-7. ... happy hacking...
-
-## Summary
-
-Using this toolchain makes it easy to leverage `nix` from NixOS, MacOSX or even Windows (WSL+ubuntu+nix). This toolchain is reproducible, behaves like the rest of the packages from nixpkgs and contains a set of well working examples to learn and adapt from.
-
-If in trouble, ask the maintainers.
-
--- a/doc/languages-frameworks/gnome.xml
+++ b/doc/languages-frameworks/gnome.xml
@ -1,299 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-language-gnome">
- <title>GNOME</title>
-
- <section xml:id="ssec-gnome-packaging">
-  <title>Packaging GNOME applications</title>
-
-  <para>
-   Programs in the GNOME universe are written in various languages but they all use GObject-based libraries like GLib, GTK or GStreamer. These libraries are often modular, relying on looking into certain directories to find their modules. However, due to Nix’s specific file system organization, this will fail without our intervention. Fortunately, the libraries usually allow overriding the directories through environment variables, either natively or thanks to a patch in nixpkgs. <link xlink:href="#fun-wrapProgram">Wrapping</link> the executables to ensure correct paths are available to the application constitutes a significant part of packaging a modern desktop application. In this section, we will describe various modules needed by such applications, environment variables needed to make the modules load, and finally a script that will do the work for us.
-  </para>
-
-  <section xml:id="ssec-gnome-settings">
-   <title>Settings</title>
-
-   <para>
-    <link xlink:href="https://developer.gnome.org/gio/stable/GSettings.html">GSettings</link> API is often used for storing settings. GSettings schemas are required, to know the type and other metadata of the stored values. GLib looks for <filename>glib-2.0/schemas/gschemas.compiled</filename> files inside the directories of <envar>XDG_DATA_DIRS</envar>.
-   </para>
-
-   <para>
-    On Linux, GSettings API is implemented using <link xlink:href="https://wiki.gnome.org/Projects/dconf">dconf</link> backend. You will need to add <literal>dconf</literal> GIO module to <envar>GIO_EXTRA_MODULES</envar> variable, otherwise the <literal>memory</literal> backend will be used and the saved settings will not be persistent.
-   </para>
-
-   <para>
-    Last you will need the dconf database D-Bus service itself. You can enable it using <option>programs.dconf.enable</option>.
-   </para>
-
-   <para>
-    Some applications will also require <package>gsettings-desktop-schemas</package> for things like reading proxy configuration or user interface customization. This dependency is often not mentioned by upstream, you should grep for <literal>org.gnome.desktop</literal> and <literal>org.gnome.system</literal> to see if the schemas are needed.
-   </para>
-  </section>
-
-  <section xml:id="ssec-gnome-icons">
-   <title>Icons</title>
-
-   <para>
-    When an application uses icons, an icon theme should be available in <envar>XDG_DATA_DIRS</envar> during runtime. The package for the default, icon-less <link xlink:href="https://www.freedesktop.org/wiki/Software/icon-theme/">hicolor-icon-theme</link> (should be propagated by every icon theme) contains <link linkend="ssec-gnome-hooks-hicolor-icon-theme">a setup hook</link> that will pick up icon themes from <literal>buildInputs</literal> and pass it to our wrapper. Unfortunately, relying on that would mean every user has to download the theme included in the package expression no matter their preference. For that reason, we leave the installation of icon theme on the user. If you use one of the desktop environments, you probably already have an icon theme installed.
-   </para>
-
-   <para>
-    To avoid costly file system access when locating icons, GTK, <link xlink:href="https://woboq.com/blog/qicon-reads-gtk-icon-cache-in-qt57.html">as well as Qt</link>, can rely on <filename>icon-theme.cache</filename> files from the themes’ top-level directories. These files are generated using <command>gtk-update-icon-cache</command>, which is expected to be run whenever an icon is added or removed to an icon theme (typically an application icon into <literal>hicolor</literal> theme) and some programs do indeed run this after icon installation. However, since packages are installed into their own prefix by Nix, this would lead to conflicts. For that reason, <package>gtk3</package> provides a <link xlink:href="#ssec-gnome-hooks-gtk-drop-icon-theme-cache">setup hook</link> that will clean the file from installation. Since most applications only ship their own icon that will be loaded on start-up, it should not affect them too much. On the other hand, icon themes are much larger and more widely used so we need to cache them. Because we recommend installing icon themes globally, we will generate the cache files from all packages in a profile using a NixOS module. You can enable the cache generation using <option>gtk.iconCache.enable</option> option if your desktop environment does not already do that.
-   </para>
-  </section>
-
-  <section xml:id="ssec-icon-theme-packaging">
-    <title>Packaging icon themes</title>
-
-    <para>
-      Icon themes may inherit from other icon themes. The inheritance is specified using the <literal>Inherits</literal> key in the <filename>index.theme</filename> file distributed with the icon theme. According to the <link xlink:href="https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html">icon theme specification</link>, icons not provided by the theme are looked for in its parent icon themes. Therefore the parent themes should be installed as dependencies for a more complete experience regarding the icon sets used.
-    </para>
-
-    <para>
-      The package <package>hicolor-icon-theme</package> provides a setup hook which makes symbolic links for the parent themes into the directory <filename>share/icons</filename> of the current theme directory in the nix store, making sure they can be found at runtime. For that to work the packages providing parent icon themes should be listed as propagated build dependencies, together with <package>hicolor-icon-theme</package>.
-    </para>
-
-    <para>
-      Also make sure that <filename>icon-theme.cache</filename> is installed for each theme provided by the package, and set <code>dontDropIconThemeCache</code> to <code>true</code> so that the cache file is not removed by the <package>gtk3</package> setup hook.
-    </para>
-
-  </section>
-
-  <section xml:id="ssec-gnome-themes">
-   <title>GTK Themes</title>
-
-   <para>
-    Previously, a GTK theme needed to be in <envar>XDG_DATA_DIRS</envar>. This is no longer necessary for most programs since GTK incorporated Adwaita theme. Some programs (for example, those designed for <link xlink:href="https://elementary.io/docs/human-interface-guidelines#human-interface-guidelines">elementary HIG</link>) might require a special theme like <package>pantheon.elementary-gtk-theme</package>.
-   </para>
-  </section>
-
-  <section xml:id="ssec-gnome-typelibs">
-   <title>GObject introspection typelibs</title>
-
-   <para>
-    <link xlink:href="https://wiki.gnome.org/Projects/GObjectIntrospection">GObject introspection</link> allows applications to use C libraries in other languages easily. It does this through <literal>typelib</literal> files searched in <envar>GI_TYPELIB_PATH</envar>.
-   </para>
-  </section>
-
-  <section xml:id="ssec-gnome-plugins">
-   <title>Various plug-ins</title>
-
-   <para>
-    If your application uses <link xlink:href="https://gstreamer.freedesktop.org/">GStreamer</link> or <link xlink:href="https://wiki.gnome.org/Projects/Grilo">Grilo</link>, you should set <envar>GST_PLUGIN_SYSTEM_PATH_1_0</envar> and <envar>GRL_PLUGIN_PATH</envar>, respectively.
-   </para>
-  </section>
- </section>
-
- <section xml:id="ssec-gnome-hooks">
-  <title>Onto <package>wrapGAppsHook</package></title>
-
-  <para>
-   Given the requirements above, the package expression would become messy quickly:
-<programlisting>
-preFixup = ''
-  for f in $(find $out/bin/ $out/libexec/ -type f -executable); do
-    wrapProgram "$f" \
-      --prefix GIO_EXTRA_MODULES : "${getLib dconf}/lib/gio/modules" \
-      --prefix XDG_DATA_DIRS : "$out/share" \
-      --prefix XDG_DATA_DIRS : "$out/share/gsettings-schemas/${name}" \
-      --prefix XDG_DATA_DIRS : "${gsettings-desktop-schemas}/share/gsettings-schemas/${gsettings-desktop-schemas.name}" \
-      --prefix XDG_DATA_DIRS : "${hicolor-icon-theme}/share" \
-      --prefix GI_TYPELIB_PATH : "${lib.makeSearchPath "lib/girepository-1.0" [ pango json-glib ]}"
-  done
-'';
-</programlisting>
-   Fortunately, there is <package>wrapGAppsHook</package>, that does the wrapping for us. In particular, it works in conjunction with other setup hooks that will populate the variable:
-   <itemizedlist>
-    <listitem xml:id="ssec-gnome-hooks-wrapgappshook">
-     <para>
-      <package>wrapGAppsHook</package> itself will add the package’s <filename>share</filename> directory to <envar>XDG_DATA_DIRS</envar>.
-     </para>
-    </listitem>
-    <listitem xml:id="ssec-gnome-hooks-glib">
-     <para>
-      <package>glib</package> setup hook will populate <envar>GSETTINGS_SCHEMAS_PATH</envar> and then <package>wrapGAppsHook</package> will prepend it to <envar>XDG_DATA_DIRS</envar>.
-     </para>
-    </listitem>
-    <listitem xml:id="ssec-gnome-hooks-gtk-drop-icon-theme-cache">
-     <para>
-      One of <package>gtk3</package>’s setup hooks will remove <filename>icon-theme.cache</filename> files from package’s icon theme directories to avoid conflicts. Icon theme packages should prevent this with <code>dontDropIconThemeCache = true;</code>.
-     </para>
-    </listitem>
-    <listitem xml:id="ssec-gnome-hooks-dconf">
-     <para>
-      <package>dconf.lib</package> is a dependency of <package>wrapGAppsHook</package>, which then also adds it to the <envar>GIO_EXTRA_MODULES</envar> variable.
-     </para>
-    </listitem>
-    <listitem xml:id="ssec-gnome-hooks-hicolor-icon-theme">
-     <para>
-      <package>hicolor-icon-theme</package>’s setup hook will add icon themes to <envar>XDG_ICON_DIRS</envar> which is prepended to <envar>XDG_DATA_DIRS</envar> by <package>wrapGAppsHook</package>.
-     </para>
-    </listitem>
-    <listitem xml:id="ssec-gnome-hooks-gobject-introspection">
-     <para>
-      <package>gobject-introspection</package> setup hook populates <envar>GI_TYPELIB_PATH</envar> variable with <filename>lib/girepository-1.0</filename> directories of dependencies, which is then added to wrapper by <package>wrapGAppsHook</package>. It also adds <filename>share</filename> directories of dependencies to <envar>XDG_DATA_DIRS</envar>, which is intended to promote GIR files but it also <link xlink:href="https://github.com/NixOS/nixpkgs/issues/32790">pollutes the closures</link> of packages using <package>wrapGAppsHook</package>.
-     </para>
-     <warning>
-      <para>
-       The setup hook <link xlink:href="https://github.com/NixOS/nixpkgs/issues/56943">currently</link> does not work in expressions with <literal>strictDeps</literal> enabled, like Python packages. In those cases, you will need to disable it with <code>strictDeps = false;</code>.
-      </para>
-     </warning>
-    </listitem>
-    <listitem xml:id="ssec-gnome-hooks-gst-grl-plugins">
-     <para>
-      Setup hooks of <package>gst_all_1.gstreamer</package> and <package>gnome3.grilo</package> will populate the <envar>GST_PLUGIN_SYSTEM_PATH_1_0</envar> and <envar>GRL_PLUGIN_PATH</envar> variables, respectively, which will then be added to the wrapper by <literal>wrapGAppsHook</literal>.
-     </para>
-    </listitem>
-   </itemizedlist>
-  </para>
-
-  <para>
-   You can also pass additional arguments to <literal>makeWrapper</literal> using <literal>gappsWrapperArgs</literal> in <literal>preFixup</literal> hook:
-<programlisting>
-preFixup = ''
-  gappsWrapperArgs+=(
-    # Thumbnailers
-    --prefix XDG_DATA_DIRS : "${gdk-pixbuf}/share"
-    --prefix XDG_DATA_DIRS : "${librsvg}/share"
-    --prefix XDG_DATA_DIRS : "${shared-mime-info}/share"
-  )
-'';
-</programlisting>
-  </para>
- </section>
-
- <section xml:id="ssec-gnome-updating">
-  <title>Updating GNOME packages</title>
-
-  <para>
-   Most GNOME package offer <link linkend="var-passthru-updateScript"><literal>updateScript</literal></link>, it is therefore possible to update to latest source tarball by running <command>nix-shell maintainers/scripts/update.nix --argstr package gnome3.nautilus</command> or even en masse with <command>nix-shell maintainers/scripts/update.nix --argstr path gnome3</command>. Read the package’s <filename>NEWS</filename> file to see what changed.
-  </para>
- </section>
-
- <section xml:id="ssec-gnome-common-issues">
-  <title>Frequently encountered issues</title>
-
-  <variablelist>
-   <varlistentry xml:id="ssec-gnome-common-issues-no-schemas">
-    <term>
-     <computeroutput>GLib-GIO-ERROR **: <replaceable>06:04:50.903</replaceable>: No GSettings schemas are installed on the system</computeroutput>
-    </term>
-    <listitem>
-     <para>
-      There are no schemas avalable in <envar>XDG_DATA_DIRS</envar>. Temporarily add a random package containing schemas like <package>gsettings-desktop-schemas</package> to <literal>buildInputs</literal>. <link linkend="ssec-gnome-hooks-glib"><package>glib</package></link> and <link linkend="ssec-gnome-hooks-wrapgappshook"><package>wrapGAppsHook</package></link> setup hooks will take care of making the schemas available to application and you will see the actual missing schemas with the <link linkend="ssec-gnome-common-issues-missing-schema">next error</link>. Or you can try looking through the source code for the actual schemas used.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry xml:id="ssec-gnome-common-issues-missing-schema">
-    <term>
-     <computeroutput>GLib-GIO-ERROR **: <replaceable>06:04:50.903</replaceable>: Settings schema ‘<replaceable>org.gnome.foo</replaceable>’ is not installed</computeroutput>
-    </term>
-    <listitem>
-     <para>
-      Package is missing some GSettings schemas. You can find out the package containing the schema with <command>nix-locate <replaceable>org.gnome.foo</replaceable>.gschema.xml</command> and let the hooks handle the wrapping as <link linkend="ssec-gnome-common-issues-no-schemas">above</link>.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry xml:id="ssec-gnome-common-issues-double-wrapped">
-    <term>
-     When using <package>wrapGAppsHook</package> with special derivers you can end up with double wrapped binaries.
-    </term>
-    <listitem>
-     <para>
-      This is because derivers like <function>python.pkgs.buildPythonApplication</function> or <function>qt5.mkDerivation</function> have setup-hooks automatically added that produce wrappers with <package>makeWrapper</package>. The simplest way to workaround that is to disable the <package>wrapGAppsHook</package> automatic wrapping with <code>dontWrapGApps = true;</code> and pass the arguments it intended to pass to <package>makeWrapper</package> to another.
-     </para>
-     <para>
-      In the case of a Python application it could look like:
-<programlisting>
-python3.pkgs.buildPythonApplication {
-  pname = "gnome-music";
-  version = "3.32.2";
-
-  nativeBuildInputs = [
-    wrapGAppsHook
-    gobject-introspection
-    ...
-  ];
-
-  dontWrapGApps = true;
-
-  # Arguments to be passed to `makeWrapper`, only used by buildPython*
-  preFixup = ''
-    makeWrapperArgs+=("''${gappsWrapperArgs[@]}")
-  '';
-}
-</programlisting>
-      And for a QT app like:
-<programlisting>
-mkDerivation {
-  pname = "calibre";
-  version = "3.47.0";
-
-  nativeBuildInputs = [
-    wrapGAppsHook
-    qmake
-    ...
-  ];
-
-  dontWrapGApps = true;
-
-  # Arguments to be passed to `makeWrapper`, only used by qt5’s mkDerivation
-  preFixup = ''
-    qtWrapperArgs+=("''${gappsWrapperArgs[@]}")
-  '';
-}
-</programlisting>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry xml:id="ssec-gnome-common-issues-unwrappable-package">
-    <term>
-     I am packaging a project that cannot be wrapped, like a library or GNOME Shell extension.
-    </term>
-    <listitem>
-     <para>
-      You can rely on applications depending on the library setting the necessary environment variables but that is often easy to miss. Instead we recommend to patch the paths in the source code whenever possible. Here are some examples:
-      <itemizedlist>
-       <listitem xml:id="ssec-gnome-common-issues-unwrappable-package-gnome-shell-ext">
-        <para>
-         <link xlink:href="https://github.com/NixOS/nixpkgs/blob/7bb8f05f12ca3cff9da72b56caa2f7472d5732bc/pkgs/desktops/gnome-3/core/gnome-shell-extensions/default.nix#L21-L24">Replacing a <envar>GI_TYPELIB_PATH</envar> in GNOME Shell extension</link> – we are using <function>substituteAll</function> to include the path to a typelib into a patch.
-        </para>
-       </listitem>
-       <listitem xml:id="ssec-gnome-common-issues-unwrappable-package-gsettings">
-        <para>
-         The following examples are hardcoding GSettings schema paths. To get the schema paths we use the functions
-         <itemizedlist>
-          <listitem>
-           <para>
-            <function>glib.getSchemaPath</function> Takes a nix package attribute as an argument.
-           </para>
-          </listitem>
-          <listitem>
-           <para>
-            <function>glib.makeSchemaPath</function> Takes a package output like <literal>$out</literal> and a derivation name. You should use this if the schemas you need to hardcode are in the same derivation.
-           </para>
-          </listitem>
-         </itemizedlist>
-        </para>
-        <para xml:id="ssec-gnome-common-issues-unwrappable-package-gsettings-vala">
-         <link xlink:href="https://github.com/NixOS/nixpkgs/blob/7bb8f05f12ca3cff9da72b56caa2f7472d5732bc/pkgs/desktops/pantheon/apps/elementary-files/default.nix#L78-L86">Hard-coding GSettings schema path in Vala plug-in (dynamically loaded library)</link> – here, <function>substituteAll</function> cannot be used since the schema comes from the same package preventing us from pass its path to the function, probably due to a <link xlink:href="https://github.com/NixOS/nix/issues/1846">Nix bug</link>.
-        </para>
-        <para xml:id="ssec-gnome-common-issues-unwrappable-package-gsettings-c">
-         <link xlink:href="https://github.com/NixOS/nixpkgs/blob/29c120c065d03b000224872251bed93932d42412/pkgs/development/libraries/glib-networking/default.nix#L31-L34">Hard-coding GSettings schema path in C library</link> – nothing special other than using <link xlink:href="https://github.com/NixOS/nixpkgs/pull/67957#issuecomment-527717467">Coccinelle patch</link> to generate the patch itself.
-        </para>
-       </listitem>
-      </itemizedlist>
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry xml:id="ssec-gnome-common-issues-weird-location">
-    <term>
-     I need to wrap a binary outside <filename>bin</filename> and <filename>libexec</filename> directories.
-    </term>
-    <listitem>
-     <para>
-      You can manually trigger the wrapping with <function>wrapGApp</function> in <literal>preFixup</literal> phase. It takes a path to a program as a first argument; the remaining arguments are passed directly to <function xlink:href="#fun-wrapProgram">wrapProgram</function> function.
-     </para>
-    </listitem>
-   </varlistentry>
-  </variablelist>
- </section>
-</section>
--- a/doc/languages-frameworks/go.xml
+++ b/doc/languages-frameworks/go.xml
@ -1,203 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-language-go">
- <title>Go</title>
-
- <section xml:id="ssec-go-modules">
-  <title>Go modules</title>
-
-  <para>
-   The function <varname> buildGoModule </varname> builds Go programs managed with Go modules. It builds a <link xlink:href="https://github.com/golang/go/wiki/Modules">Go modules</link> through a two phase build:
-   <itemizedlist>
-    <listitem>
-     <para>
-      An intermediate fetcher derivation. This derivation will be used to fetch all of the dependencies of the Go module.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
-      A final derivation will use the output of the intermediate derivation to build the binaries and produce the final output.
-     </para>
-    </listitem>
-   </itemizedlist>
-  </para>
-
-  <example xml:id='ex-buildGoModule'>
-   <title>buildGoModule</title>
-<programlisting>
-pet = buildGoModule rec {
-  pname = "pet";
-  version = "0.3.4";
-
-  src = fetchFromGitHub {
-    owner = "knqyf263";
-    repo = "pet";
-    rev = "v${version}";
-    sha256 = "0m2fzpqxk7hrbxsgqplkg7h2p7gv6s1miymv3gvw0cz039skag0s";
-  };
-
-  vendorSha256 = "1879j77k96684wi554rkjxydrj8g3hpp0kvxz03sd8dmwr3lh83j"; <co xml:id='ex-buildGoModule-1' />
-
-  subPackages = [ "." ]; <co xml:id='ex-buildGoModule-2' />
-
-  meta = with lib; {
-    description = "Simple command-line snippet manager, written in Go";
-    homepage = "https://github.com/knqyf263/pet";
-    license = licenses.mit;
-    maintainers = with maintainers; [ kalbasit ];
-    platforms = platforms.linux ++ platforms.darwin;
-  };
-}
-</programlisting>
-  </example>
-
-  <para>
-   <xref linkend='ex-buildGoModule'/> is an example expression using buildGoModule, the following arguments are of special significance to the function:
-   <calloutlist>
-    <callout arearefs='ex-buildGoModule-1'>
-     <para>
-      <varname>vendorSha256</varname> is the hash of the output of the intermediate fetcher derivation.
-     </para>
-    </callout>
-    <callout arearefs='ex-buildGoModule-2'>
-     <para>
-      <varname>subPackages</varname> limits the builder from building child packages that have not been listed. If <varname>subPackages</varname> is not specified, all child packages will be built.
-     </para>
-    </callout>
-   </calloutlist>
-  </para>
-
-  <para>
-    <varname>vendorSha256</varname> can also take <varname>null</varname> as an input.
-
-    When `null` is used as a value, rather than fetching the dependencies
-    and vendoring them, we use the vendoring included within the source repo.
-    If you'd like to not have to update this field on dependency changes, 
-    run `go mod vendor` in your source repo and set 'vendorSha256 = null;'
-  </para>
- </section>
-
- <section xml:id="ssec-go-legacy">
-  <title>Go legacy</title>
-
-  <para>
-   The function <varname> buildGoPackage </varname> builds legacy Go programs, not supporting Go modules.
-  </para>
-
-  <example xml:id='ex-buildGoPackage'>
-   <title>buildGoPackage</title>
-<programlisting>
-deis = buildGoPackage rec {
-  pname = "deis";
-  version = "1.13.0";
-
-  goPackagePath = "github.com/deis/deis"; <co xml:id='ex-buildGoPackage-1' />
-  subPackages = [ "client" ]; <co xml:id='ex-buildGoPackage-2' />
-
-  src = fetchFromGitHub {
-    owner = "deis";
-    repo = "deis";
-    rev = "v${version}";
-    sha256 = "1qv9lxqx7m18029lj8cw3k7jngvxs4iciwrypdy0gd2nnghc68sw";
-  };
-
-  goDeps = ./deps.nix; <co xml:id='ex-buildGoPackage-3' />
-
-  buildFlags = [ "--tags" "release" ]; <co xml:id='ex-buildGoPackage-4' />
-}
-</programlisting>
-  </example>
-
-  <para>
-   <xref linkend='ex-buildGoPackage'/> is an example expression using buildGoPackage, the following arguments are of special significance to the function:
-   <calloutlist>
-    <callout arearefs='ex-buildGoPackage-1'>
-     <para>
-      <varname>goPackagePath</varname> specifies the package's canonical Go import path.
-     </para>
-    </callout>
-    <callout arearefs='ex-buildGoPackage-2'>
-     <para>
-      <varname>subPackages</varname> limits the builder from building child packages that have not been listed. If <varname>subPackages</varname> is not specified, all child packages will be built.
-     </para>
-     <para>
-      In this example only <literal>github.com/deis/deis/client</literal> will be built.
-     </para>
-    </callout>
-    <callout arearefs='ex-buildGoPackage-3'>
-     <para>
-      <varname>goDeps</varname> is where the Go dependencies of a Go program are listed as a list of package source identified by Go import path. It could be imported as a separate <varname>deps.nix</varname> file for readability. The dependency data structure is described below.
-     </para>
-    </callout>
-    <callout arearefs='ex-buildGoPackage-4'>
-     <para>
-      <varname>buildFlags</varname> is a list of flags passed to the go build command.
-     </para>
-    </callout>
-   </calloutlist>
-  </para>
-
-  <para>
-   The <varname>goDeps</varname> attribute can be imported from a separate <varname>nix</varname> file that defines which Go libraries are needed and should be included in <varname>GOPATH</varname> for <varname>buildPhase</varname>.
-  </para>
-
-  <example xml:id='ex-goDeps'>
-   <title>deps.nix</title>
-<programlisting>
-[ <co xml:id='ex-goDeps-1' />
-  {
-    goPackagePath = "gopkg.in/yaml.v2"; <co xml:id='ex-goDeps-2' />
-    fetch = {
-      type = "git"; <co xml:id='ex-goDeps-3' />
-      url = "https://gopkg.in/yaml.v2";
-      rev = "a83829b6f1293c91addabc89d0571c246397bbf4";
-      sha256 = "1m4dsmk90sbi17571h6pld44zxz7jc4lrnl4f27dpd1l8g5xvjhh";
-    };
-  }
-  {
-    goPackagePath = "github.com/docopt/docopt-go";
-    fetch = {
-      type = "git";
-      url = "https://github.com/docopt/docopt-go";
-      rev = "784ddc588536785e7299f7272f39101f7faccc3f";
-      sha256 = "0wwz48jl9fvl1iknvn9dqr4gfy1qs03gxaikrxxp9gry6773v3sj";
-    };
-  }
-]
-</programlisting>
-  </example>
-
-  <para>
-   <calloutlist>
-    <callout arearefs='ex-goDeps-1'>
-     <para>
-      <varname>goDeps</varname> is a list of Go dependencies.
-     </para>
-    </callout>
-    <callout arearefs='ex-goDeps-2'>
-     <para>
-      <varname>goPackagePath</varname> specifies Go package import path.
-     </para>
-    </callout>
-    <callout arearefs='ex-goDeps-3'>
-     <para>
-      <varname>fetch type</varname> that needs to be used to get package source. If <varname>git</varname> is used there should be <varname>url</varname>, <varname>rev</varname> and <varname>sha256</varname> defined next to it.
-     </para>
-    </callout>
-   </calloutlist>
-  </para>
-
-  <para>
-   To extract dependency information from a Go package in automated way use <link xlink:href="https://github.com/kamilchm/go2nix">go2nix</link>. It can produce complete derivation and <varname>goDeps</varname> file for Go programs.
-  </para>
-
-  <para>
-   You may use Go packages installed into the active Nix profiles by adding the following to your ~/.bashrc:
-<screen>
-for p in $NIX_PROFILES; do
-    GOPATH="$p/share/go:$GOPATH"
-done
-</screen>
-  </para>
- </section>
-</section>
--- a/doc/languages-frameworks/haskell.section.md
+++ b/doc/languages-frameworks/haskell.section.md
--- a/doc/languages-frameworks/idris.section.md
+++ b/doc/languages-frameworks/idris.section.md
@ -1,144 +0,0 @@
-# Idris
-
-## Installing Idris
-
-The easiest way to get a working idris version is to install the `idris` attribute:
-
-```
-$ # On NixOS
-$ nix-env -i nixos.idris
-$ # On non-NixOS
-$ nix-env -i nixpkgs.idris
-```
-
-This however only provides the `prelude` and `base` libraries. To install idris with additional libraries, you can use the `idrisPackages.with-packages` function, e.g. in an overlay in `~/.config/nixpkgs/overlays/my-idris.nix`:
-
-```nix
-self: super: {
-  myIdris = with self.idrisPackages; with-packages [ contrib pruviloj ];
-}
-```
-
-And then:
-
-```
-$ # On NixOS
-$ nix-env -iA nixos.myIdris
-$ # On non-NixOS
-$ nix-env -iA nixpkgs.myIdris
-```
-
-To see all available Idris packages:
-```
-$ # On NixOS
-$ nix-env -qaPA nixos.idrisPackages
-$ # On non-NixOS
-$ nix-env -qaPA nixpkgs.idrisPackages
-```
-
-Similarly, entering a `nix-shell`:
-```
-$ nix-shell -p 'idrisPackages.with-packages (with idrisPackages; [ contrib pruviloj ])'
-```
-
-## Starting Idris with library support
-
-To have access to these libraries in idris, call it with an argument `-p <library name>` for each library:
-
-```
-$ nix-shell -p 'idrisPackages.with-packages (with idrisPackages; [ contrib pruviloj ])'
-[nix-shell:~]$ idris -p contrib -p pruviloj
-```
-
-A listing of all available packages the Idris binary has access to is available via `--listlibs`:
-
-```
-$ idris --listlibs
-00prelude-idx.ibc
-pruviloj
-base
-contrib
-prelude
-00pruviloj-idx.ibc
-00base-idx.ibc
-00contrib-idx.ibc
-```
-
-## Building an Idris project with Nix
-
-As an example of how a Nix expression for an Idris package can be created, here is the one for `idrisPackages.yaml`:
-
-```nix
-{ build-idris-package
-, fetchFromGitHub
-, contrib
-, lightyear
-, lib
-}:
-build-idris-package  {
-  name = "yaml";
-  version = "2018-01-25";
-
-  # This is the .ipkg file that should be built, defaults to the package name
-  # In this case it should build `Yaml.ipkg` instead of `yaml.ipkg`
-  # This is only necessary because the yaml packages ipkg file is
-  # different from its package name here.
-  ipkgName = "Yaml";
-  # Idris dependencies to provide for the build
-  idrisDeps = [ contrib lightyear ];
-
-  src = fetchFromGitHub {
-    owner = "Heather";
-    repo = "Idris.Yaml";
-    rev = "5afa51ffc839844862b8316faba3bafa15656db4";
-    sha256 = "1g4pi0swmg214kndj85hj50ccmckni7piprsxfdzdfhg87s0avw7";
-  };
-
-  meta = {
-    description = "Idris YAML lib";
-    homepage = "https://github.com/Heather/Idris.Yaml";
-    license = lib.licenses.mit;
-    maintainers = [ lib.maintainers.brainrape ];
-  };
-}
-```
-
-Assuming this file is saved as `yaml.nix`, it's buildable using
-
-```
-$ nix-build -E '(import <nixpkgs> {}).idrisPackages.callPackage ./yaml.nix {}'
-```
-
-Or it's possible to use
-
-```nix
-with import <nixpkgs> {};
-
-{
-  yaml = idrisPackages.callPackage ./yaml.nix {};
-}
-```
-
-in another file (say `default.nix`) to be able to build it with
-
-```
-$ nix-build -A yaml
-```
-
-## Passing options to `idris` commands
-
-The `build-idris-package` function provides also optional input values to set additional options for the used `idris` commands.
-
-Specifically, you can set `idrisBuildOptions`, `idrisTestOptions`, `idrisInstallOptions` and `idrisDocOptions` to provide additional options to the `idris` command respectively when building, testing, installing and generating docs for your package.
-
-For example you could set
-
-```
-build-idris-package {
-  idrisBuildOptions = [ "--log" "1" "--verbose" ]
-
-  ...
-}
-```
-
-to require verbose output during `idris` build phase.
--- a/doc/languages-frameworks/index.xml
+++ b/doc/languages-frameworks/index.xml
@ -1,34 +0,0 @@
-<chapter xmlns="http://docbook.org/ns/docbook"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="chap-language-support">
- <title>Languages and frameworks</title>
- <para>
-  The <link linkend="chap-stdenv">standard build environment</link> makes it easy to build typical Autotools-based packages with very little code. Any other kind of package can be accomodated by overriding the appropriate phases of <literal>stdenv</literal>. However, there are specialised functions in Nixpkgs to easily build packages for other programming languages, such as Perl or Haskell. These are described in this chapter.
- </para>
- <xi:include href="agda.section.xml" />
- <xi:include href="android.section.xml" />
- <xi:include href="beam.xml" />
- <xi:include href="bower.xml" />
- <xi:include href="coq.xml" />
- <xi:include href="crystal.section.xml" />
- <xi:include href="emscripten.section.xml" />
- <xi:include href="gnome.xml" />
- <xi:include href="go.xml" />
- <xi:include href="haskell.section.xml" />
- <xi:include href="idris.section.xml" />
- <xi:include href="ios.section.xml" />
- <xi:include href="java.xml" />
- <xi:include href="lua.section.xml" />
- <xi:include href="node.section.xml" />
- <xi:include href="ocaml.xml" />
- <xi:include href="perl.xml" />
- <xi:include href="php.section.xml" />
- <xi:include href="python.section.xml" />
- <xi:include href="qt.xml" />
- <xi:include href="r.section.xml" />
- <xi:include href="ruby.xml" />
- <xi:include href="rust.section.xml" />
- <xi:include href="texlive.xml" />
- <xi:include href="titanium.section.xml" />
- <xi:include href="vim.section.xml" />
-</chapter>
--- a/doc/languages-frameworks/ios.section.md
+++ b/doc/languages-frameworks/ios.section.md
@ -1,229 +0,0 @@
---
-title: iOS
-author: Sander van der Burg
-date: 2019-11-10
---
-# iOS
-
-This component is basically a wrapper/workaround that makes it possible to
-expose an Xcode installation as a Nix package by means of symlinking to the
-relevant executables on the host system.
-
-Since Xcode can't be packaged with Nix, nor we can publish it as a Nix package
-(because of its license) this is basically the only integration strategy
-making it possible to do iOS application builds that integrate with other
-components of the Nix ecosystem
-
-The primary objective of this project is to use the Nix expression language to
-specify how iOS apps can be built from source code, and to automatically spawn
-iOS simulator instances for testing.
-
-This component also makes it possible to use [Hydra](https://nixos.org/hydra),
-the Nix-based continuous integration server to regularly build iOS apps and to
-do wireless ad-hoc installations of enterprise IPAs on iOS devices through
-Hydra.
-
-The Xcode build environment implements a number of features.
-
-Deploying a proxy component wrapper exposing Xcode
--------------------------------------------------
-The first use case is deploying a Nix package that provides symlinks to the Xcode
-installation on the host system. This package can be used as a build input to
-any build function implemented in the Nix expression language that requires
-Xcode.
-
-```nix
-let
-  pkgs = import <nixpkgs> {};
-
-  xcodeenv = import ./xcodeenv {
-    inherit (pkgs) stdenv;
-  };
-in
-xcodeenv.composeXcodeWrapper {
-  version = "9.2";
-  xcodeBaseDir = "/Applications/Xcode.app";
-}
-```
-
-By deploying the above expression with `nix-build` and inspecting its content
-you will notice that several Xcode-related executables are exposed as a Nix
-package:
-
-```bash
-$ ls result/bin
-lrwxr-xr-x  1 sander  staff  94  1 jan  1970 Simulator -> /Applications/Xcode.app/Contents/Developer/Applications/Simulator.app/Contents/MacOS/Simulator
-lrwxr-xr-x  1 sander  staff  17  1 jan  1970 codesign -> /usr/bin/codesign
-lrwxr-xr-x  1 sander  staff  17  1 jan  1970 security -> /usr/bin/security
-lrwxr-xr-x  1 sander  staff  21  1 jan  1970 xcode-select -> /usr/bin/xcode-select
-lrwxr-xr-x  1 sander  staff  61  1 jan  1970 xcodebuild -> /Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild
-lrwxr-xr-x  1 sander  staff  14  1 jan  1970 xcrun -> /usr/bin/xcrun
-```
-
-Building an iOS application
---------------------------
-We can build an iOS app executable for the simulator, or an IPA/xcarchive file
-for release purposes, e.g. ad-hoc, enterprise or store installations, by
-executing the `xcodeenv.buildApp {}` function:
-
-```nix
-let
-  pkgs = import <nixpkgs> {};
-
-  xcodeenv = import ./xcodeenv {
-    inherit (pkgs) stdenv;
-  };
-in
-xcodeenv.buildApp {
-  name = "MyApp";
-  src = ./myappsources;
-  sdkVersion = "11.2";
-
-  target = null; # Corresponds to the name of the app by default
-  configuration = null; # Release for release builds, Debug for debug builds
-  scheme = null; # -scheme will correspond to the app name by default
-  sdk = null; # null will set it to 'iphonesimulator` for simulator builds or `iphoneos` to real builds
-  xcodeFlags = "";
-
-  release = true;
-  certificateFile = ./mycertificate.p12;
-  certificatePassword = "secret";
-  provisioningProfile = ./myprovisioning.profile;
-  signMethod = "ad-hoc"; # 'enterprise' or 'store'
-  generateIPA = true;
-  generateXCArchive = false;
-
-  enableWirelessDistribution = true;
-  installURL = "/installipa.php";
-  bundleId = "mycompany.myapp";
-  appVersion = "1.0";
-
-  # Supports all xcodewrapper parameters as well
-  xcodeBaseDir = "/Applications/Xcode.app";
-}
-```
-
-The above function takes a variety of parameters:
-* The `name` and `src` parameters are mandatory and specify the name of the app
-  and the location where the source code resides
-* `sdkVersion` specifies which version of the iOS SDK to use.
-
-It also possile to adjust the `xcodebuild` parameters. This is only needed in
-rare circumstances. In most cases the default values should suffice:
-
-* Specifies which `xcodebuild` target to build. By default it takes the target
-  that has the same name as the app.
-* The `configuration` parameter can be overridden if desired. By default, it
-  will do a debug build for the simulator and a release build for real devices.
-* The `scheme` parameter specifies which `-scheme` parameter to propagate to
-  `xcodebuild`. By default, it corresponds to the app name.
-* The `sdk` parameter specifies which SDK to use. By default, it picks
-  `iphonesimulator` for simulator builds and `iphoneos` for release builds.
-* The `xcodeFlags` parameter specifies arbitrary command line parameters that
-  should be propagated to `xcodebuild`.
-
-By default, builds are carried out for the iOS simulator. To do release builds
-(builds for real iOS devices), you must set the `release` parameter to `true`.
-In addition, you need to set the following parameters:
-
-* `certificateFile` refers to a P12 certificate file.
-* `certificatePassword` specifies the password of the P12 certificate.
-* `provisioningProfile` refers to the provision profile needed to sign the app
-* `signMethod` should refer to `ad-hoc` for signing the app with an ad-hoc
-  certificate, `enterprise` for enterprise certificates and `app-store` for App
-  store certificates.
-* `generateIPA` specifies that we want to produce an IPA file (this is probably
-  what you want)
-* `generateXCArchive` specifies thet we want to produce an xcarchive file.
-
-When building IPA files on Hydra and when it is desired to allow iOS devices to
-install IPAs by browsing to the Hydra build products page, you can enable the
-`enableWirelessDistribution` parameter.
-
-When enabled, you need to configure the following options:
-
-* The `installURL` parameter refers to the URL of a PHP script that composes the
-  `itms-services://` URL allowing iOS devices to install the IPA file.
-* `bundleId` refers to the bundle ID value of the app
-* `appVersion` refers to the app's version number
-
-To use wireless adhoc distributions, you must also install the corresponding
-PHP script on a web server (see section: 'Installing the PHP script for wireless
-ad hoc installations from Hydra' for more information).
-
-In addition to the build parameters, you can also specify any parameters that
-the `xcodeenv.composeXcodeWrapper {}` function takes. For example, the
-`xcodeBaseDir` parameter can be overridden to refer to a different Xcode
-version.
-
-Spawning simulator instances
----------------------------
-In addition to building iOS apps, we can also automatically spawn simulator
-instances:
-
-```nix
-let
-  pkgs = import <nixpkgs> {};
-
-  xcodeenv = import ./xcodeenv {
-    inherit (pkgs) stdenv;
-  };
-in
-xcode.simulateApp {
-  name = "simulate";
-
-  # Supports all xcodewrapper parameters as well
-  xcodeBaseDir = "/Applications/Xcode.app";
-}
-```
-
-The above expression produces a script that starts the simulator from the
-provided Xcode installation. The script can be started as follows:
-
-```bash
-./result/bin/run-test-simulator
-```
-
-By default, the script will show an overview of UDID for all available simulator
-instances and asks you to pick one. You can also provide a UDID as a
-command-line parameter to launch an instance automatically:
-
-```bash
-./result/bin/run-test-simulator 5C93129D-CF39-4B1A-955F-15180C3BD4B8
-```
-
-You can also extend the simulator script to automatically deploy and launch an
-app in the requested simulator instance:
-
-```nix
-let
-  pkgs = import <nixpkgs> {};
-
-  xcodeenv = import ./xcodeenv {
-    inherit (pkgs) stdenv;
-  };
-in
-xcode.simulateApp {
-  name = "simulate";
-  bundleId = "mycompany.myapp";
-  app = xcode.buildApp {
-    # ...
-  };
-
-  # Supports all xcodewrapper parameters as well
-  xcodeBaseDir = "/Applications/Xcode.app";
-}
-```
-
-By providing the result of an `xcode.buildApp {}` function and configuring the
-app bundle id, the app gets deployed automatically and started.
-
-Troubleshooting
---------------
-In some rare cases, it may happen that after a failure, changes are not picked
-up. Most likely, this is caused by a derived data cache that Xcode maintains.
-To wipe it you can run:
-
-```bash
-$ rm -rf ~/Library/Developer/Xcode/DerivedData
-```
--- a/doc/languages-frameworks/java.xml
+++ b/doc/languages-frameworks/java.xml
@ -1,63 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-language-java">
- <title>Java</title>
-
- <para>
-  Ant-based Java packages are typically built from source as follows:
-<programlisting>
-stdenv.mkDerivation {
-  name = "...";
-  src = fetchurl { ... };
-
-  nativeBuildInputs = [ jdk ant ];
-
-  buildPhase = "ant";
-}
-</programlisting>
-  Note that <varname>jdk</varname> is an alias for the OpenJDK (self-built where available, or pre-built via Zulu). Platforms with OpenJDK not (yet) in Nixpkgs (<literal>Aarch32</literal>, <literal>Aarch64</literal>) point to the (unfree) <literal>oraclejdk</literal>.
- </para>
-
- <para>
-  JAR files that are intended to be used by other packages should be installed in <filename>$out/share/java</filename>. JDKs have a stdenv setup hook that add any JARs in the <filename>share/java</filename> directories of the build inputs to the <envar>CLASSPATH</envar> environment variable. For instance, if the package <literal>libfoo</literal> installs a JAR named <filename>foo.jar</filename> in its <filename>share/java</filename> directory, and another package declares the attribute
-<programlisting>
-buildInputs = [ libfoo ];
-nativeBuildInputs = [ jdk ];
-</programlisting>
-  then <envar>CLASSPATH</envar> will be set to <filename>/nix/store/...-libfoo/share/java/foo.jar</filename>.
- </para>
-
- <para>
-  Private JARs should be installed in a location like <filename>$out/share/<replaceable>package-name</replaceable></filename>.
- </para>
-
- <para>
-  If your Java package provides a program, you need to generate a wrapper script to run it using the OpenJRE. You can use <literal>makeWrapper</literal> for this:
-<programlisting>
-nativeBuildInputs = [ makeWrapper ];
-
-installPhase =
-  ''
-    mkdir -p $out/bin
-    makeWrapper ${jre}/bin/java $out/bin/foo \
-      --add-flags "-cp $out/share/java/foo.jar org.foo.Main"
-  '';
-</programlisting>
-  Note the use of <literal>jre</literal>, which is the part of the OpenJDK package that contains the Java Runtime Environment. By using <literal>${jre}/bin/java</literal> instead of <literal>${jdk}/bin/java</literal>, you prevent your package from depending on the JDK at runtime.
- </para>
-
- <para>
-  Note all JDKs passthru <literal>home</literal>, so if your application requires environment variables like <envar>JAVA_HOME</envar> being set, that can be done in a generic fashion with the <literal>--set</literal> argument of <literal>makeWrapper</literal>:
-<programlisting>
--set JAVA_HOME ${jdk.home}
-</programlisting>
- </para>
-
- <para>
-  It is possible to use a different Java compiler than <command>javac</command> from the OpenJDK. For instance, to use the GNU Java Compiler:
-<programlisting>
-nativeBuildInputs = [ gcj ant ];
-</programlisting>
-  Here, Ant will automatically use <command>gij</command> (the GNU Java Runtime) instead of the OpenJRE.
- </para>
-</section>
--- a/doc/languages-frameworks/lua.section.md
+++ b/doc/languages-frameworks/lua.section.md
@ -1,252 +0,0 @@
---
-title: Lua
-author: Matthieu Coudron
-date: 2019-02-05
---
-
-# User's Guide to Lua Infrastructure
-
-## Using Lua
-
-### Overview of Lua
-
-Several versions of the Lua interpreter are available: luajit, lua 5.1, 5.2, 5.3.
-The attribute `lua` refers to the default interpreter, it is also possible to refer to specific versions, e.g. `lua5_2` refers to Lua 5.2.
-
-Lua libraries are in separate sets, with one set per interpreter version.
-
-The interpreters have several common attributes. One of these attributes is
-`pkgs`, which is a package set of Lua libraries for this specific
-interpreter. E.g., the `busted` package corresponding to the default interpreter
-is `lua.pkgs.busted`, and the lua 5.2 version is `lua5_2.pkgs.busted`.
-The main package set contains aliases to these package sets, e.g.
-`luaPackages` refers to `lua5_1.pkgs` and `lua52Packages` to
-`lua5_2.pkgs`.
-
-### Installing Lua and packages
-
-#### Lua environment defined in separate `.nix` file
-
-Create a file, e.g. `build.nix`, with the following expression
-```nix
-with import <nixpkgs> {};
-
-lua5_2.withPackages (ps: with ps; [ busted luafilesystem ])
-```
-and install it in your profile with
-```shell
-nix-env -if build.nix
-```
-Now you can use the Lua interpreter, as well as the extra packages (`busted`,
-`luafilesystem`) that you added to the environment.
-
-#### Lua environment defined in `~/.config/nixpkgs/config.nix`
-
-If you prefer to, you could also add the environment as a package override to the Nixpkgs set, e.g.
-using `config.nix`,
-```nix
-{ # ...
-
-  packageOverrides = pkgs: with pkgs; {
-    myLuaEnv = lua5_2.withPackages (ps: with ps; [ busted luafilesystem ]);
-  };
-}
-```
-and install it in your profile with
-```shell
-nix-env -iA nixpkgs.myLuaEnv
-```
-The environment is is installed by referring to the attribute, and considering
-the `nixpkgs` channel was used.
-
-#### Lua environment defined in `/etc/nixos/configuration.nix`
-
-For the sake of completeness, here's another example how to install the environment system-wide.
-
-```nix
-{ # ...
-
-  environment.systemPackages = with pkgs; [
-    (lua.withPackages(ps: with ps; [ busted luafilesystem ]))
-  ];
-}
-```
-
-### How to override a Lua package using overlays?
-
-Use the following overlay template:
-
-```nix
-final: prev:
-{
-
-  lua = prev.lua.override {
-    packageOverrides = luaself: luaprev: {
-
-      luarocks-nix = luaprev.luarocks-nix.overrideAttrs(oa: {
-        pname = "luarocks-nix";
-        src = /home/my_luarocks/repository;
-      });
-  };
-
-  luaPackages = lua.pkgs;
-}
-```
-
-### Temporary Lua environment with `nix-shell`
-
-
-There are two methods for loading a shell with Lua packages. The first and recommended method
-is to create an environment with `lua.buildEnv` or `lua.withPackages` and load that. E.g.
-```sh
-$ nix-shell -p 'lua.withPackages(ps: with ps; [ busted luafilesystem ])'
-```
-opens a shell from which you can launch the interpreter
-```sh
-[nix-shell:~] lua
-```
-The other method, which is not recommended, does not create an environment and requires you to list the packages directly,
-
-```sh
-$ nix-shell -p lua.pkgs.busted lua.pkgs.luafilesystem
-```
-Again, it is possible to launch the interpreter from the shell.
-The Lua interpreter has the attribute `pkgs` which contains all Lua libraries for that specific interpreter.
-
-
-## Developing with Lua
-
-Now that you know how to get a working Lua environment with Nix, it is time
-to go forward and start actually developing with Lua. There are two ways to
-package lua software, either it is on luarocks and most of it can be taken care
-of by the luarocks2nix converter or the packaging has to be done manually.
-Let's present the luarocks way first and the manual one in a second time.
-
-### Packaging a library on luarocks
-
-[Luarocks.org](www.luarocks.org) is the main repository of lua packages.
-The site proposes two types of packages, the rockspec and the src.rock
-(equivalent of a [rockspec](https://github.com/luarocks/luarocks/wiki/Rockspec-format) but with the source).
-These packages can have different build types such as `cmake`, `builtin` etc .
-
-Luarocks-based packages are generated in pkgs/development/lua-modules/generated-packages.nix from
-the whitelist maintainers/scripts/luarocks-packages.csv and updated by running maintainers/scripts/update-luarocks-packages.
-
-[luarocks2nix](https://github.com/nix-community/luarocks) is a tool capable of generating nix derivations from both rockspec and src.rock (and favors the src.rock).
-The automation only goes so far though and some packages need to be customized.
-These customizations go in `pkgs/development/lua-modules/overrides.nix`.
-For instance if the rockspec defines `external_dependencies`, these need to be manually added in in its rockspec file then it won't work.
-
-You can try converting luarocks packages to nix packages with the command `nix-shell -p luarocks-nix` and then `luarocks nix PKG_NAME`.
-Nix rely on luarocks to install lua packages, basically it runs:
-`luarocks make --deps-mode=none --tree $out`
-
-#### Packaging a library manually
-
-You can develop your package as you usually would, just don't forget to wrap it
-within a `toLuaModule` call, for instance
-```nix
-mynewlib = toLuaModule ( stdenv.mkDerivation { ... });
-```
-
-There is also the `buildLuaPackage` function that can be used when lua modules
-are not packaged for luarocks. You can see a few examples at `pkgs/top-level/lua-packages.nix`.
-
-## Lua Reference
-
-### Lua interpreters
-
-Versions 5.1, 5.2 and 5.3 of the lua interpreter are available as
-respectively `lua5_1`, `lua5_2` and `lua5_3`. Luajit is available too.
-The Nix expressions for the interpreters can be found in `pkgs/development/interpreters/lua-5`.
-
-
-#### Attributes on lua interpreters packages
-
-Each interpreter has the following attributes:
-
- `interpreter`. Alias for `${pkgs.lua}/bin/lua`.
- `buildEnv`. Function to build lua interpreter environments with extra packages bundled together. See section *lua.buildEnv function* for usage and documentation.
- `withPackages`. Simpler interface to `buildEnv`.
- `pkgs`. Set of Lua packages for that specific interpreter. The package set can be modified by overriding the interpreter and passing `packageOverrides`.
-
-
-#### `buildLuarocksPackage` function
-
-The `buildLuarocksPackage` function is implemented in `pkgs/development/interpreters/lua-5/build-lua-package.nix`
-The following is an example:
-```nix
-luaposix = buildLuarocksPackage {
-  pname = "luaposix";
-  version = "34.0.4-1";
-
-  src = fetchurl {
-    url    = "https://raw.githubusercontent.com/rocks-moonscript-org/moonrocks-mirror/master/luaposix-34.0.4-1.src.rock";
-    sha256 = "0yrm5cn2iyd0zjd4liyj27srphvy0gjrjx572swar6zqr4dwjqp2";
-  };
-  disabled = (luaOlder "5.1") || (luaAtLeast "5.4");
-  propagatedBuildInputs = [ bit32 lua std_normalize ];
-
-  meta = with stdenv.lib; {
-    homepage = "https://github.com/luaposix/luaposix/";
-    description = "Lua bindings for POSIX";
-    maintainers = with maintainers; [ vyp lblasc ];
-    license.fullName = "MIT/X11";
-  };
-};
-```
-
-The `buildLuarocksPackage` delegates most tasks to luarocks:
-
-* it adds `luarocks` as an unpacker for `src.rock` files (zip files really).
-* configurePhase` writes a temporary luarocks configuration file which location
-is exported via the environment variable `LUAROCKS_CONFIG`.
-* the `buildPhase` does nothing.
-* `installPhase` calls `luarocks make --deps-mode=none --tree $out` to build and
-install the package
-* In the `postFixup` phase, the `wrapLuaPrograms` bash function is called to
-  wrap all programs in the `$out/bin/*` directory to include `$PATH`
-  environment variable and add dependent libraries to script's `LUA_PATH` and
-  `LUA_CPATH`.
-
-By default `meta.platforms` is set to the same value as the interpreter unless overridden otherwise.
-
-#### `buildLuaApplication` function
-
-The `buildLuaApplication` function is practically the same as `buildLuaPackage`.
-The difference is that `buildLuaPackage` by default prefixes the names of the packages with the version of the interpreter.
-Because with an application we're not interested in multiple version the prefix is dropped.
-
-#### lua.withPackages function
-
-The `lua.withPackages` takes a function as an argument that is passed the set of lua packages and returns the list of packages to be included in the environment.
-Using the `withPackages` function, the previous example for the luafilesystem environment can be written like this:
-```nix
-with import <nixpkgs> {};
-
-lua.withPackages (ps: [ps.luafilesystem])
-```
-
-`withPackages` passes the correct package set for the specific interpreter version as an argument to the function. In the above example, `ps` equals `luaPackages`.
-But you can also easily switch to using `lua5_2`:
-```nix
-with import <nixpkgs> {};
-
-lua5_2.withPackages (ps: [ps.lua])
-```
-
-Now, `ps` is set to `lua52Packages`, matching the version of the interpreter.
-
-
-### Possible Todos
-
-* export/use version specific variables such as `LUA_PATH_5_2`/`LUAROCKS_CONFIG_5_2`
-* let luarocks check for dependencies via exporting the different rocktrees in temporary config
-
-### Lua Contributing guidelines
-
-Following rules should be respected:
-
-* Make sure libraries build for all Lua interpreters.
-* Commit names of Lua libraries should reflect that they are Lua libraries, so write for example `luaPackages.luafilesystem: 1.11 -> 1.12`.
-
--- a/doc/languages-frameworks/node.section.md
+++ b/doc/languages-frameworks/node.section.md
@ -1,50 +0,0 @@
-Node.js
-=======
-The `pkgs/development/node-packages` folder contains a generated collection of
-[NPM packages](https://npmjs.com/) that can be installed with the Nix package
-manager.
-
-As a rule of thumb, the package set should only provide *end user* software
-packages, such as command-line utilities. Libraries should only be added to the
-package set if there is a non-NPM package that requires it.
-
-When it is desired to use NPM libraries in a development project, use the
-`node2nix` generator directly on the `package.json` configuration file of the
-project.
-
-The package set provides support for the official stable Node.js versions.
-The latest stable LTS release in `nodePackages`, as well as the latest stable
-Current release in `nodePackages_latest`.
-
-If your package uses native addons, you need to examine what kind of native
-build system it uses. Here are some examples:
-
-* `node-gyp`
-* `node-gyp-builder`
-* `node-pre-gyp`
-
-After you have identified the correct system, you need to override your package
-expression while adding in build system as a build input. For example, `dat`
-requires `node-gyp-build`, so we override its expression in `default.nix`:
-
-```nix
-dat = nodePackages.dat.override (oldAttrs: {
-  buildInputs = oldAttrs.buildInputs ++ [ nodePackages.node-gyp-build ];
-});
-```
-
-To add a package from NPM to nixpkgs:
-
- 1. Modify `pkgs/development/node-packages/node-packages.json` to add, update
-    or remove package entries to have it included in `nodePackages` and
-    `nodePackages_latest`.
- 2. Run the script: `(cd pkgs/development/node-packages && ./generate.sh)`.
- 3. Build your new package to test your changes:
-    `cd /path/to/nixpkgs && nix-build -A nodePackages.<new-or-updated-package>`.
-    To build against the latest stable Current Node.js version (e.g. 14.x):
-    `nix-build -A nodePackages_latest.<new-or-updated-package>`
- 4. Add and commit all modified and generated files.
-
-For more information about the generation process, consult the
-[README.md](https://github.com/svanderburg/node2nix) file of the `node2nix`
-tool.
--- a/doc/languages-frameworks/ocaml.xml
+++ b/doc/languages-frameworks/ocaml.xml
@ -1,73 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-language-ocaml">
- <title>OCaml</title>
-
- <para>
-  OCaml libraries should be installed in <literal>$(out)/lib/ocaml/${ocaml.version}/site-lib/</literal>. Such directories are automatically added to the <literal>$OCAMLPATH</literal> environment variable when building another package that depends on them or when opening a <literal>nix-shell</literal>.
- </para>
-
- <para>
-  Given that most of the OCaml ecosystem is now built with dune, nixpkgs includes a convenience build support function called <literal>buildDunePackage</literal> that will build an OCaml package using dune, OCaml and findlib and any additional dependencies provided as <literal>buildInputs</literal> or <literal>propagatedBuildInputs</literal>.
- </para>
-
- <para>
-  Here is a simple package example. It defines an (optional) attribute <literal>minimumOCamlVersion</literal> that will be used to throw a descriptive evaluation error if building with an older OCaml is attempted. It uses the <literal>fetchFromGitHub</literal> fetcher to get its source. It sets the <literal>doCheck</literal> (optional) attribute to <literal>true</literal> which means that tests will be run with <literal>dune runtest -p angstrom</literal> after the build (<literal>dune build -p angstrom</literal>) is complete. It uses <literal>alcotest</literal> as a build input (because it is needed to run the tests) and <literal>bigstringaf</literal> and <literal>result</literal> as propagated build inputs (thus they will also be available to libraries depending on this library). The library will be installed using the <literal>angstrom.install</literal> file that dune generates.
- </para>
-
-<programlisting>
-{ stdenv, fetchFromGitHub, buildDunePackage, alcotest, result, bigstringaf }:
-
-buildDunePackage rec {
-  pname = "angstrom";
-  version = "0.10.0";
-
-  minimumOCamlVersion = "4.03";
-
-  src = fetchFromGitHub {
-    owner  = "inhabitedtype";
-    repo   = pname;
-    rev    = version;
-    sha256 = "0lh6024yf9ds0nh9i93r9m6p5psi8nvrqxl5x7jwl13zb0r9xfpw";
-  };
-
-  buildInputs = [ alcotest ];
-  propagatedBuildInputs = [ bigstringaf result ];
-  doCheck = true;
-
-  meta = {
-    homepage = "https://github.com/inhabitedtype/angstrom";
-    description = "OCaml parser combinators built for speed and memory efficiency";
-    license = stdenv.lib.licenses.bsd3;
-    maintainers = with stdenv.lib.maintainers; [ sternenseemann ];
-  };
-}
-</programlisting>
-
- <para>
-  Here is a second example, this time using a source archive generated with <literal>dune-release</literal>. It is a good idea to use this archive when it is available as it will usually contain substituted variables such as a <literal>%%VERSION%%</literal> field. This library does not depend on any other OCaml library and no tests are run after building it.
- </para>
-
-<programlisting>
-{ stdenv, fetchurl, buildDunePackage }:
-
-buildDunePackage rec {
-  pname = "wtf8";
-  version = "1.0.1";
-
-  minimumOCamlVersion = "4.01";
-
-  src = fetchurl {
-    url = "https://github.com/flowtype/ocaml-${pname}/releases/download/v${version}/${pname}-${version}.tbz";
-    sha256 = "1msg3vycd3k8qqj61sc23qks541cxpb97vrnrvrhjnqxsqnh6ygq";
-  };
-
-  meta = with stdenv.lib; {
-    homepage = "https://github.com/flowtype/ocaml-wtf8";
-    description = "WTF-8 is a superset of UTF-8 that allows unpaired surrogates.";
-    license = licenses.mit;
-    maintainers = [ maintainers.eqyiel ];
-  };
-}
-</programlisting>
-</section>
--- a/doc/languages-frameworks/perl.xml
+++ b/doc/languages-frameworks/perl.xml
@ -1,161 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-language-perl">
- <title>Perl</title>
-
- <para>
-  Nixpkgs provides a function <varname>buildPerlPackage</varname>, a generic package builder function for any Perl package that has a standard <varname>Makefile.PL</varname>. It’s implemented in <link
-xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/perl-modules/generic"><filename>pkgs/development/perl-modules/generic</filename></link>.
- </para>
-
- <para>
-  Perl packages from CPAN are defined in <link
-xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/perl-packages.nix"><filename>pkgs/top-level/perl-packages.nix</filename></link>, rather than <filename>pkgs/all-packages.nix</filename>. Most Perl packages are so straight-forward to build that they are defined here directly, rather than having a separate function for each package called from <filename>perl-packages.nix</filename>. However, more complicated packages should be put in a separate file, typically in <filename>pkgs/development/perl-modules</filename>. Here is an example of the former:
-<programlisting>
-ClassC3 = buildPerlPackage rec {
-  name = "Class-C3-0.21";
-  src = fetchurl {
-    url = "mirror://cpan/authors/id/F/FL/FLORA/${name}.tar.gz";
-    sha256 = "1bl8z095y4js66pwxnm7s853pi9czala4sqc743fdlnk27kq94gz";
-  };
-};
-</programlisting>
-  Note the use of <literal>mirror://cpan/</literal>, and the <literal>${name}</literal> in the URL definition to ensure that the name attribute is consistent with the source that we’re actually downloading. Perl packages are made available in <filename>all-packages.nix</filename> through the variable <varname>perlPackages</varname>. For instance, if you have a package that needs <varname>ClassC3</varname>, you would typically write
-<programlisting>
-foo = import ../path/to/foo.nix {
-  inherit stdenv fetchurl ...;
-  inherit (perlPackages) ClassC3;
-};
-</programlisting>
-  in <filename>all-packages.nix</filename>. You can test building a Perl package as follows:
-<screen>
-<prompt>$ </prompt>nix-build -A perlPackages.ClassC3
-</screen>
-  <varname>buildPerlPackage</varname> adds <literal>perl-</literal> to the start of the name attribute, so the package above is actually called <literal>perl-Class-C3-0.21</literal>. So to install it, you can say:
-<screen>
-<prompt>$ </prompt>nix-env -i perl-Class-C3
-</screen>
-  (Of course you can also install using the attribute name: <literal>nix-env -i -A perlPackages.ClassC3</literal>.)
- </para>
-
- <para>
-  So what does <varname>buildPerlPackage</varname> do? It does the following:
-  <orderedlist>
-   <listitem>
-    <para>
-     In the configure phase, it calls <literal>perl Makefile.PL</literal> to generate a Makefile. You can set the variable <varname>makeMakerFlags</varname> to pass flags to <filename>Makefile.PL</filename>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     It adds the contents of the <envar>PERL5LIB</envar> environment variable to <literal>#! .../bin/perl</literal> line of Perl scripts as <literal>-I<replaceable>dir</replaceable></literal> flags. This ensures that a script can find its dependencies. (This can cause this shebang line to become too long for Darwin to handle; see the note below.)
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     In the fixup phase, it writes the propagated build inputs (<varname>propagatedBuildInputs</varname>) to the file <filename>$out/nix-support/propagated-user-env-packages</filename>. <command>nix-env</command> recursively installs all packages listed in this file when you install a package that has it. This ensures that a Perl package can find its dependencies.
-    </para>
-   </listitem>
-  </orderedlist>
- </para>
-
- <para>
-  <varname>buildPerlPackage</varname> is built on top of <varname>stdenv</varname>, so everything can be customised in the usual way. For instance, the <literal>BerkeleyDB</literal> module has a <varname>preConfigure</varname> hook to generate a configuration file used by <filename>Makefile.PL</filename>:
-<programlisting>
-{ buildPerlPackage, fetchurl, db }:
-
-buildPerlPackage rec {
-  name = "BerkeleyDB-0.36";
-
-  src = fetchurl {
-    url = "mirror://cpan/authors/id/P/PM/PMQS/${name}.tar.gz";
-    sha256 = "07xf50riarb60l1h6m2dqmql8q5dij619712fsgw7ach04d8g3z1";
-  };
-
-  preConfigure = ''
-    echo "LIB = ${db.out}/lib" > config.in
-    echo "INCLUDE = ${db.dev}/include" >> config.in
-  '';
-}
-</programlisting>
- </para>
-
- <para>
-  Dependencies on other Perl packages can be specified in the <varname>buildInputs</varname> and <varname>propagatedBuildInputs</varname> attributes. If something is exclusively a build-time dependency, use <varname>buildInputs</varname>; if it’s (also) a runtime dependency, use <varname>propagatedBuildInputs</varname>. For instance, this builds a Perl module that has runtime dependencies on a bunch of other modules:
-<programlisting>
-ClassC3Componentised = buildPerlPackage rec {
-  name = "Class-C3-Componentised-1.0004";
-  src = fetchurl {
-    url = "mirror://cpan/authors/id/A/AS/ASH/${name}.tar.gz";
-    sha256 = "0xql73jkcdbq4q9m0b0rnca6nrlvf5hyzy8is0crdk65bynvs8q1";
-  };
-  propagatedBuildInputs = [
-    ClassC3 ClassInspector TestException MROCompat
-  ];
-};
-</programlisting>
- </para>
-
- <para>
-  On Darwin, if a script has too many <literal>-I<replaceable>dir</replaceable></literal> flags in its first line (its “shebang line”), it will not run. This can be worked around by calling the <literal>shortenPerlShebang</literal> function from the <literal>postInstall</literal> phase:
-<programlisting>
-{ stdenv, buildPerlPackage, fetchurl, shortenPerlShebang }:
-
-ImageExifTool = buildPerlPackage {
-  pname = "Image-ExifTool";
-  version = "11.50";
-
-  src = fetchurl {
-    url = "https://www.sno.phy.queensu.ca/~phil/exiftool/Image-ExifTool-11.50.tar.gz";
-    sha256 = "0d8v48y94z8maxkmw1rv7v9m0jg2dc8xbp581njb6yhr7abwqdv3";
-  };
-
-  buildInputs = stdenv.lib.optional stdenv.isDarwin shortenPerlShebang;
-  postInstall = stdenv.lib.optional stdenv.isDarwin ''
-    shortenPerlShebang $out/bin/exiftool
-  '';
-};
-</programlisting>
-  This will remove the <literal>-I</literal> flags from the shebang line, rewrite them in the <literal>use lib</literal> form, and put them on the next line instead. This function can be given any number of Perl scripts as arguments; it will modify them in-place.
- </para>
-
- <section xml:id="ssec-generation-from-CPAN">
-  <title>Generation from CPAN</title>
-
-  <para>
-   Nix expressions for Perl packages can be generated (almost) automatically from CPAN. This is done by the program <command>nix-generate-from-cpan</command>, which can be installed as follows:
-  </para>
-
-<screen>
-<prompt>$ </prompt>nix-env -i nix-generate-from-cpan
-</screen>
-
-  <para>
-   This program takes a Perl module name, looks it up on CPAN, fetches and unpacks the corresponding package, and prints a Nix expression on standard output. For example:
-<screen>
-<prompt>$ </prompt>nix-generate-from-cpan XML::Simple
-  XMLSimple = buildPerlPackage rec {
-    name = "XML-Simple-2.22";
-    src = fetchurl {
-      url = "mirror://cpan/authors/id/G/GR/GRANTM/${name}.tar.gz";
-      sha256 = "b9450ef22ea9644ae5d6ada086dc4300fa105be050a2030ebd4efd28c198eb49";
-    };
-    propagatedBuildInputs = [ XMLNamespaceSupport XMLSAX XMLSAXExpat ];
-    meta = {
-      description = "An API for simple XML files";
-      license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
-    };
-  };
-</screen>
-   The output can be pasted into <filename>pkgs/top-level/perl-packages.nix</filename> or wherever else you need it.
-  </para>
- </section>
-
- <section xml:id="ssec-perl-cross-compilation">
-  <title>Cross-compiling modules</title>
-
-  <para>
-   Nixpkgs has experimental support for cross-compiling Perl modules. In many cases, it will just work out of the box, even for modules with native extensions. Sometimes, however, the Makefile.PL for a module may (indirectly) import a native module. In that case, you will need to make a stub for that module that will satisfy the Makefile.PL and install it into <filename>lib/perl5/site_perl/cross_perl/${perl.version}</filename>. See the <varname>postInstall</varname> for <varname>DBI</varname> for an example.
-  </para>
- </section>
-</section>
--- a/doc/languages-frameworks/php.section.md
+++ b/doc/languages-frameworks/php.section.md
@ -1,137 +0,0 @@
-# PHP {#sec-php}
-
-## User Guide {#ssec-php-user-guide}
-
-### Overview {#ssec-php-user-guide-overview}
-
-Several versions of PHP are available on Nix, each of which having a
-wide variety of extensions and libraries available.
-
-The different versions of PHP that nixpkgs provides are located under
-attributes named based on major and minor version number; e.g.,
-`php74` is PHP 7.4.
-
-Only versions of PHP that are supported by upstream for the entirety
-of a given NixOS release will be included in that release of
-NixOS. See [PHP Supported
-Versions](https://www.php.net/supported-versions.php).
-
-The attribute `php` refers to the version of PHP considered most
-stable and thoroughly tested in nixpkgs for any given release of
-NixOS - not necessarily the latest major release from upstream.
-
-All available PHP attributes are wrappers around their respective
-binary PHP package and provide commonly used extensions this way. The
-real PHP 7.4 package, i.e. the unwrapped one, is available as
-`php74.unwrapped`; see the next section for more details.
-
-Interactive tools built on PHP are put in `php.packages`; composer is
-for example available at `php.packages.composer`.
-
-Most extensions that come with PHP, as well as some popular
-third-party ones, are available in `php.extensions`; for example, the
-opcache extension shipped with PHP is available at
-`php.extensions.opcache` and the third-party ImageMagick extension at
-`php.extensions.imagick`.
-
-### Installing PHP with extensions {#ssec-php-user-guide-installing-with-extensions}
-
-A PHP package with specific extensions enabled can be built using
-`php.withExtensions`. This is a function which accepts an anonymous
-function as its only argument; the function should accept two named
-parameters: `enabled` - a list of currently enabled extensions and
-`all` - the set of all extensions, and return a list of wanted
-extensions. For example, a PHP package with all default extensions and
-ImageMagick enabled:
-
-```nix
-php.withExtensions ({ enabled, all }:
-  enabled ++ [ all.imagick ])
-```
-
-To exclude some, but not all, of the default extensions, you can
-filter the `enabled` list like this:
-
-```nix
-php.withExtensions ({ enabled, all }:
-  (lib.filter (e: e != php.extensions.opcache) enabled)
-  ++ [ all.imagick ])
-```
-
-To build your list of extensions from the ground up, you can simply
-ignore `enabled`:
-
-```nix
-php.withExtensions ({ all, ... }: with all; [ imagick opcache ])
-```
-
-`php.withExtensions` provides extensions by wrapping a minimal php
-base package, providing a `php.ini` file listing all extensions to be
-loaded. You can access this package through the `php.unwrapped`
-attribute; useful if you, for example, need access to the `dev`
-output. The generated `php.ini` file can be accessed through the
-`php.phpIni` attribute.
-
-If you want a PHP build with extra configuration in the `php.ini`
-file, you can use `php.buildEnv`. This function takes two named and
-optional parameters: `extensions` and `extraConfig`. `extensions`
-takes an extension specification equivalent to that of
-`php.withExtensions`, `extraConfig` a string of additional `php.ini`
-configuration parameters. For example, a PHP package with the opcache
-and ImageMagick extensions enabled, and `memory_limit` set to `256M`:
-
-```nix
-php.buildEnv {
-  extensions = { all, ... }: with all; [ imagick opcache ];
-  extraConfig = "memory_limit=256M";
-}
-```
-
-#### Example setup for `phpfpm` {#ssec-php-user-guide-installing-with-extensions-phpfpm}
-
-You can use the previous examples in a `phpfpm` pool called `foo` as
-follows:
-
-```nix
-let
-  myPhp = php.withExtensions ({ all, ... }: with all; [ imagick opcache ]);
-in {
-  services.phpfpm.pools."foo".phpPackage = myPhp;
-};
-```
-
-```nix
-let
-  myPhp = php.buildEnv {
-    extensions = { all, ... }: with all; [ imagick opcache ];
-    extraConfig = "memory_limit=256M";
-  };
-in {
-  services.phpfpm.pools."foo".phpPackage = myPhp;
-};
-```
-
-#### Example usage with `nix-shell` {#ssec-php-user-guide-installing-with-extensions-nix-shell}
-
-This brings up a temporary environment that contains a PHP interpreter
-with the extensions `imagick` and `opcache` enabled:
-
-```sh
-nix-shell -p 'php.withExtensions ({ all, ... }: with all; [ imagick opcache ])'
-```
-
-### Installing PHP packages with extensions {#ssec-php-user-guide-installing-packages-with-extensions}
-
-All interactive tools use the PHP package you get them from, so all
-packages at `php.packages.*` use the `php` package with its default
-extensions. Sometimes this default set of extensions isn't enough and
-you may want to extend it. A common case of this is the `composer`
-package: a project may depend on certain extensions and `composer`
-won't work with that project unless those extensions are loaded.
-
-Example of building `composer` with additional extensions:
-```nix
-(php.withExtensions ({ all, enabled }:
-  enabled ++ (with all; [ imagick redis ]))
-).packages.composer
-```
--- a/doc/languages-frameworks/python.section.md
+++ b/doc/languages-frameworks/python.section.md
--- a/doc/languages-frameworks/qt.xml
+++ b/doc/languages-frameworks/qt.xml
@ -1,149 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-language-qt">
- <title>Qt</title>
-
- <para>
-  This section describes the differences between Nix expressions for Qt libraries and applications and Nix expressions for other C++ software. Some knowledge of the latter is assumed. There are primarily two problems which the Qt infrastructure is designed to address: ensuring consistent versioning of all dependencies and finding dependencies at runtime.
- </para>
-
- <example xml:id='qt-default-nix'>
-  <title>Nix expression for a Qt package (<filename>default.nix</filename>)</title>
-<programlisting>
-{ mkDerivation, lib, qtbase }: <co xml:id='qt-default-nix-co-1' />
-
-mkDerivation { <co xml:id='qt-default-nix-co-2' />
-  pname = "myapp";
-  version = "1.0";
-
-  buildInputs = [ qtbase ]; <co xml:id='qt-default-nix-co-3' />
-}
-   </programlisting>
- </example>
-
- <calloutlist>
-  <callout arearefs='qt-default-nix-co-1'>
-   <para>
-    Import <literal>mkDerivation</literal> and Qt (such as <literal>qtbase</literal> modules directly. <emphasis>Do not</emphasis> import Qt package sets; the Qt versions of dependencies may not be coherent, causing build and runtime failures.
-   </para>
-  </callout>
-  <callout arearefs='qt-default-nix-co-2'>
-   <para>
-    Use <literal>mkDerivation</literal> instead of <literal>stdenv.mkDerivation</literal>. <literal>mkDerivation</literal> is a wrapper around <literal>stdenv.mkDerivation</literal> which applies some Qt-specific settings. This deriver accepts the same arguments as <literal>stdenv.mkDerivation</literal>; refer to <xref linkend='chap-stdenv' /> for details.
-   </para>
-   <para>
-    To use another deriver instead of <literal>stdenv.mkDerivation</literal>, use <literal>mkDerivationWith</literal>:
-<programlisting>
-mkDerivationWith myDeriver {
-  # ...
-}
-</programlisting>
-    If you cannot use <literal>mkDerivationWith</literal>, please refer to <xref linkend='qt-runtime-dependencies' />.
-   </para>
-  </callout>
-  <callout arearefs='qt-default-nix-co-3'>
-   <para>
-    <literal>mkDerivation</literal> accepts the same arguments as <literal>stdenv.mkDerivation</literal>, such as <literal>buildInputs</literal>.
-   </para>
-  </callout>
- </calloutlist>
-
- <formalpara xml:id='qt-runtime-dependencies'>
-  <title>Locating runtime dependencies</title>
-  <para>
-   Qt applications need to be wrapped to find runtime dependencies. If you cannot use <literal>mkDerivation</literal> or <literal>mkDerivationWith</literal> above, include <literal>wrapQtAppsHook</literal> in <literal>nativeBuildInputs</literal>:
-<programlisting>
-stdenv.mkDerivation {
-  # ...
-
-  nativeBuildInputs = [ wrapQtAppsHook ];
-}
-</programlisting>
-  </para>
- </formalpara>
-
- <para>
-  Entries added to <literal>qtWrapperArgs</literal> are used to modify the wrappers created by <literal>wrapQtAppsHook</literal>. The entries are passed as arguments to <xref linkend='fun-wrapProgram' />.
-<programlisting>
-mkDerivation {
-  # ...
-
-  qtWrapperArgs = [ ''--prefix PATH : /path/to/bin'' ];
-}
-</programlisting>
- </para>
-
- <para>
-  Set <literal>dontWrapQtApps</literal> to stop applications from being wrapped automatically. It is required to wrap applications manually with <literal>wrapQtApp</literal>, using the syntax of <xref linkend='fun-wrapProgram' />:
-<programlisting>
-mkDerivation {
-  # ...
-
-  dontWrapQtApps = true;
-  preFixup = ''
-      wrapQtApp "$out/bin/myapp" --prefix PATH : /path/to/bin
-  '';
-}
-</programlisting>
- </para>
-
- <note>
-  <para>
-   <literal>wrapQtAppsHook</literal> ignores files that are non-ELF executables. This means that scripts won't be automatically wrapped so you'll need to manually wrap them as previously mentioned. An example of when you'd always need to do this is with Python applications that use PyQT.
-  </para>
- </note>
-
- <para>
-  Libraries are built with every available version of Qt. Use the <literal>meta.broken</literal> attribute to disable the package for unsupported Qt versions:
-<programlisting>
-mkDerivation {
-  # ...
-
-  # Disable this library with Qt &lt; 5.9.0
-  meta.broken = builtins.compareVersions qtbase.version "5.9.0" &lt; 0;
-}
-</programlisting>
- </para>
-
- <formalpara>
-  <title>Adding a library to Nixpkgs</title>
-  <para>
-   Add a Qt library to <filename>all-packages.nix</filename> by adding it to the collection inside <literal>mkLibsForQt5</literal>. This ensures that the library is built with every available version of Qt as needed.
-   <example xml:id='qt-library-all-packages-nix'>
-    <title>Adding a Qt library to <filename>all-packages.nix</filename></title>
-<programlisting>
-{
-  # ...
-
-  mkLibsForQt5 = self: with self; {
-    # ...
-
-    mylib = callPackage ../path/to/mylib {};
-  };
-
-  # ...
-}
-</programlisting>
-   </example>
-  </para>
- </formalpara>
-
- <formalpara>
-  <title>Adding an application to Nixpkgs</title>
-  <para>
-   Add a Qt application to <filename>all-packages.nix</filename> using <literal>libsForQt5.callPackage</literal> instead of the usual <literal>callPackage</literal>. The former ensures that all dependencies are built with the same version of Qt.
-   <example xml:id='qt-application-all-packages-nix'>
-    <title>Adding a Qt application to <filename>all-packages.nix</filename></title>
-<programlisting>
-{
-  # ...
-
-  myapp = libsForQt5.callPackage ../path/to/myapp/ {};
-
-  # ...
-}
-</programlisting>
-   </example>
-  </para>
- </formalpara>
-</section>
--- a/doc/languages-frameworks/r.section.md
+++ b/doc/languages-frameworks/r.section.md
@ -1,120 +0,0 @@
-R
-=
-
-## Installation
-
-Define an environment for R that contains all the libraries that you'd like to
-use by adding the following snippet to your $HOME/.config/nixpkgs/config.nix file:
-
-```nix
-{
-    packageOverrides = super: let self = super.pkgs; in
-    {
-
-        rEnv = super.rWrapper.override {
-            packages = with self.rPackages; [
-                devtools
-                ggplot2
-                reshape2
-                yaml
-                optparse
-                ];
-        };
-    };
-}
-```
-
-Then you can use `nix-env -f "<nixpkgs>" -iA rEnv` to install it into your user
-profile. The set of available libraries can be discovered by running the
-command `nix-env -f "<nixpkgs>" -qaP -A rPackages`. The first column from that
-output is the name that has to be passed to rWrapper in the code snipped above.
-
-However, if you'd like to add a file to your project source to make the
-environment available for other contributors, you can create a `default.nix`
-file like so:
-```nix
-let
-  pkgs = import <nixpkgs> {};
-  stdenv = pkgs.stdenv;
-in with pkgs; {
-  myProject = stdenv.mkDerivation {
-    name = "myProject";
-    version = "1";
-    src = if pkgs.lib.inNixShell then null else nix;
-
-    buildInputs = with rPackages; [
-      R
-      ggplot2
-      knitr
-    ];
-  };
-}
-```
-and then run `nix-shell .` to be dropped into a shell with those packages
-available.
-
-## RStudio
-
-RStudio uses a standard set of packages and ignores any custom R
-environments or installed packages you may have.  To create a custom
-environment, see `rstudioWrapper`, which functions similarly to
-`rWrapper`:
-
-```nix
-{
-    packageOverrides = super: let self = super.pkgs; in
-    {
-
-        rstudioEnv = super.rstudioWrapper.override {
-            packages = with self.rPackages; [
-                dplyr
-                ggplot2
-                reshape2
-                ];
-        };
-    };
-}
-```
-
-Then like above, `nix-env -f "<nixpkgs>" -iA rstudioEnv` will install
-this into your user profile.
-
-Alternatively, you can create a self-contained `shell.nix` without the need to
-modify any configuration files:
-
-```nix
-{ pkgs ? import <nixpkgs> {}
-}:
-
-pkgs.rstudioWrapper.override {
-  packages = with pkgs.rPackages; [ dplyr ggplot2 reshape2 ];
-}
-
-```
-
-Executing `nix-shell` will then drop you into an environment equivalent to the
-one above. If you need additional packages just add them to the list and
-re-enter the shell.
-
-## Updating the package set
-
-```bash
-nix-shell generate-shell.nix
-
-Rscript generate-r-packages.R cran  > cran-packages.nix.new
-mv cran-packages.nix.new cran-packages.nix
-
-Rscript generate-r-packages.R bioc  > bioc-packages.nix.new
-mv bioc-packages.nix.new bioc-packages.nix
-```
-
-`generate-r-packages.R <repo>` reads  `<repo>-packages.nix`, therefor the renaming.
-
-
-## Testing if the Nix-expression could be evaluated
-
-```bash
-nix-build test-evaluation.nix --dry-run
-```
-
-If this exits fine, the expression is ok. If not, you have to edit `default.nix`
--- a/doc/languages-frameworks/ruby.section.md
+++ b/doc/languages-frameworks/ruby.section.md
@ -1,365 +0,0 @@
---
-title: Ruby
-author: Michael Fellinger
-date: 2019-05-23
---
-
-# Ruby
-
-## User Guide
-
-### Using Ruby
-
-#### Overview
-
-Several versions of Ruby interpreters are available on Nix, as well as over 250 gems and many applications written in Ruby.
-The attribute `ruby` refers to the default Ruby interpreter, which is currently
-MRI 2.5. It's also possible to refer to specific versions, e.g. `ruby_2_6`, `jruby`, or `mruby`.
-
-In the nixpkgs tree, Ruby packages can be found throughout, depending on what
-they do, and are called from the main package set. Ruby gems, however are
-separate sets, and there's one default set for each interpreter (currently MRI
-only).
-
-There are two main approaches for using Ruby with gems.
-One is to use a specifically locked `Gemfile` for an application that has very strict dependencies.
-The other is to depend on the common gems, which we'll explain further down, and
-rely on them being updated regularly.
-
-The interpreters have common attributes, namely `gems`, and `withPackages`. So
-you can refer to `ruby.gems.nokogiri`, or `ruby_2_5.gems.nokogiri` to get the
-Nokogiri gem already compiled and ready to use.
-
-Since not all gems have executables like `nokogiri`, it's usually more
-convenient to use the `withPackages` function like this:
-`ruby.withPackages (p: with p; [ nokogiri ])`. This will also make sure that the
-Ruby in your environment will be able to find the gem and it can be used in your
-Ruby code (for example via `ruby` or `irb` executables) via `require "nokogiri"`
-as usual.
-
-#### Temporary Ruby environment with `nix-shell`
-
-Rather than having a single Ruby environment shared by all Ruby
-development projects on a system, Nix allows you to create separate
-environments per project.  `nix-shell` gives you the possibility to
-temporarily load another environment akin to a combined `chruby` or
-`rvm` and `bundle exec`.
-
-There are two methods for loading a shell with Ruby packages. The first and
-recommended method is to create an environment with `ruby.withPackages` and load
-that.
-
-```shell
-nix-shell -p "ruby.withPackages (ps: with ps; [ nokogiri pry ])"
-```
-
-The other method, which is not recommended, is to create an environment and list
-all the packages directly.
-
-```shell
-nix-shell -p ruby.gems.nokogiri ruby.gems.pry
-```
-
-Again, it's possible to launch the interpreter from the shell. The Ruby
-interpreter has the attribute `gems` which contains all Ruby gems for that
-specific interpreter.
-
-##### Load environment from `.nix` expression
-
-As explained in the Nix manual, `nix-shell` can also load an expression from a
-`.nix` file. Say we want to have Ruby 2.5, `nokogori`, and `pry`. Consider a
-`shell.nix` file with:
-
-```nix
-with import <nixpkgs> {};
-ruby.withPackages (ps: with ps; [ nokogiri pry ])
-```
-
-What's happening here?
-
-1. We begin with importing the Nix Packages collections. `import <nixpkgs>`
-   imports the `<nixpkgs>` function, `{}` calls it and the `with` statement
-   brings all attributes of `nixpkgs` in the local scope. These attributes form
-   the main package set.
-2. Then we create a Ruby environment with the `withPackages` function.
-3. The `withPackages` function expects us to provide a function as an argument
-   that takes the set of all ruby gems and returns a list of packages to include
-   in the environment. Here, we select the packages `nokogiri` and `pry` from
-   the package set.
-
-##### Execute command with `--run`
-
-A convenient flag for `nix-shell` is `--run`. It executes a command in the
-`nix-shell`. We can e.g. directly open a `pry` REPL:
-
-```shell
-nix-shell -p "ruby.withPackages (ps: with ps; [ nokogiri pry ])" --run "pry"
-```
-
-Or immediately require `nokogiri` in pry:
-
-```shell
-nix-shell -p "ruby.withPackages (ps: with ps; [ nokogiri pry ])" --run "pry -rnokogiri"
-```
-
-Or run a script using this environment:
-
-```shell
-nix-shell -p "ruby.withPackages (ps: with ps; [ nokogiri pry ])" --run "ruby example.rb"
-```
-
-##### Using `nix-shell` as shebang
-
-In fact, for the last case, there is a more convenient method. You can add a
-[shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) to your script
-specifying which dependencies `nix-shell` needs. With the following shebang, you
-can just execute `./example.rb`, and it will run with all dependencies.
-
-```ruby
-#! /usr/bin/env nix-shell
-#! nix-shell -i ruby -p "ruby.withPackages (ps: with ps; [ nokogiri rest-client ])"
-
-require 'nokogiri'
-require 'rest-client'
-
-body = RestClient.get('http://example.com').body
-puts Nokogiri::HTML(body).at('h1').text
-```
-
-### Developing with Ruby
-
-#### Using an existing Gemfile
-
-In most cases, you'll already have a `Gemfile.lock` listing all your dependencies.
-This can be used to generate a `gemset.nix` which is used to fetch the gems and
-combine them into a single environment.
-The reason why you need to have a separate file for this, is that Nix requires
-you to have a checksum for each input to your build.
-Since the `Gemfile.lock` that `bundler` generates doesn't provide us with
-checksums, we have to first download each gem, calculate its SHA256, and store
-it in this separate file.
-
-So the steps from having just a `Gemfile` to a `gemset.nix` are:
-
-```shell
-bundle lock
-bundix
-```
-
-If you already have a `Gemfile.lock`, you can simply run `bundix` and it will
-work the same.
-
-To update the gems in your `Gemfile.lock`, you may use the `bundix -l` flag,
-which will create a new `Gemfile.lock` in case the `Gemfile` has a more recent
-time of modification.
-
-Once the `gemset.nix` is generated, it can be used in a
-`bundlerEnv` derivation. Here is an example you could use for your `shell.nix`:
-
-```nix
-# ...
-let
-  gems = bundlerEnv {
-    name = "gems-for-some-project";
-    gemdir = ./.;
-  };
-in mkShell { buildInputs = [ gems gems.wrappedRuby ]; }
-```
-
-With this file in your directory, you can run `nix-shell` to build and use the gems.
-The important parts here are `bundlerEnv` and `wrappedRuby`.
-
-The `bundlerEnv` is a wrapper over all the gems in your gemset. This means that
-all the `/lib` and `/bin` directories will be available, and the executables of
-all gems (even of indirect dependencies) will end up in your `$PATH`.
-The `wrappedRuby` provides you with all executables that come with Ruby itself,
-but wrapped so they can easily find the gems in your gemset.
-
-One common issue that you might have is that you have Ruby 2.6, but also
-`bundler` in your gemset. That leads to a conflict for `/bin/bundle` and
-`/bin/bundler`. You can resolve this by wrapping either your Ruby or your gems
-in a `lowPrio` call. So in order to give the `bundler` from your gemset
-priority, it would be used like this:
-
-```nix
-# ...
-mkShell { buildInputs = [ gems (lowPrio gems.wrappedRuby) ]; }
-```
-
-
-#### Gem-specific configurations and workarounds
-
-In some cases, especially if the gem has native extensions, you might need to
-modify the way the gem is built.
-
-This is done via a common configuration file that includes all of the
-workarounds for each gem.
-
-This file lives at `/pkgs/development/ruby-modules/gem-config/default.nix`,
-since it already contains a lot of entries, it should be pretty easy to add the
-modifications you need for your needs.
-
-In the meanwhile, or if the modification is for a private gem, you can also add
-the configuration to only your own environment.
-
-Two places that allow this modification are the `ruby` derivation, or `bundlerEnv`.
-
-Here's the `ruby` one:
-
-```nix
-{ pg_version ? "10", pkgs ? import <nixpkgs> { } }:
-let
-  myRuby = pkgs.ruby.override {
-    defaultGemConfig = pkgs.defaultGemConfig // {
-      pg = attrs: {
-        buildFlags =
-        [ "--with-pg-config=${pkgs."postgresql_${pg_version}"}/bin/pg_config" ];
-      };
-    };
-  };
-in myRuby.withPackages (ps: with ps; [ pg ])
-```
-
-And an example with `bundlerEnv`:
-
-```nix
-{ pg_version ? "10", pkgs ? import <nixpkgs> { } }:
-let
-  gems = pkgs.bundlerEnv {
-    name = "gems-for-some-project";
-    gemdir = ./.;
-    gemConfig = pkgs.defaultGemConfig // {
-      pg = attrs: {
-        buildFlags =
-        [ "--with-pg-config=${pkgs."postgresql_${pg_version}"}/bin/pg_config" ];
-      };
-    };
-  };
-in mkShell { buildInputs = [ gems gems.wrappedRuby ]; }
-```
-
-And finally via overlays:
-
-```nix
-{ pg_version ? "10" }:
-let
-  pkgs = import <nixpkgs> {
-    overlays = [
-      (self: super: {
-        defaultGemConfig = super.defaultGemConfig // {
-          pg = attrs: {
-            buildFlags = [
-              "--with-pg-config=${
-                pkgs."postgresql_${pg_version}"
-              }/bin/pg_config"
-            ];
-          };
-        };
-      })
-    ];
-  };
-in pkgs.ruby.withPackages (ps: with ps; [ pg ])
-```
-
-Then we can get whichever postgresql version we desire and the `pg` gem will
-always reference it correctly:
-
-```shell
-$ nix-shell --argstr pg_version 9_4 --run 'ruby -rpg -e "puts PG.library_version"'
-90421
-
-$ nix-shell --run 'ruby -rpg -e "puts PG.library_version"'
-100007
-```
-
-Of course for this use-case one could also use overlays since the configuration
-for `pg` depends on the `postgresql` alias, but for demonstration purposes this
-has to suffice.
-
-#### Adding a gem to the default gemset
-
-Now that you know how to get a working Ruby environment with Nix, it's time to
-go forward and start actually developing with Ruby.
-We will first have a look at how Ruby gems are packaged on Nix. Then, we will
-look at how you can use development mode with your code.
-
-All gems in the standard set are automatically generated from a single
-`Gemfile`. The dependency resolution is done with `bundler` and makes it more
-likely that all gems are compatible to each other.
-
-In order to add a new gem to nixpkgs, you can put it into the
-`/pkgs/development/ruby-modules/with-packages/Gemfile` and run
-`./maintainers/scripts/update-ruby-packages`.
-
-To test that it works, you can then try using the gem with:
-
-```shell
-NIX_PATH=nixpkgs=$PWD nix-shell -p "ruby.withPackages (ps: with ps; [ name-of-your-gem ])"
-```
-
-#### Packaging applications
-
-A common task is to add a ruby executable to nixpkgs, popular examples would be
-`chef`, `jekyll`, or `sass`. A good way to do that is to use the `bundlerApp`
-function, that allows you to make a package that only exposes the listed
-executables, otherwise the package may cause conflicts through common paths like
-`bin/rake` or `bin/bundler` that aren't meant to be used.
-
-The absolute easiest way to do that is to write a
-`Gemfile` along these lines:
-
-```ruby
-source 'https://rubygems.org' do
-  gem 'mdl'
-end
-```
-
-If you want to package a specific version, you can use the standard Gemfile
-syntax for that, e.g. `gem 'mdl', '0.5.0'`, but if you want the latest stable
-version anyway, it's easier to update by simply running the `bundle lock` and
-`bundix` steps again.
-
-Now you can also also make a `default.nix` that looks like this:
-
-```nix
-{ lib, bundlerApp }:
-
-bundlerApp {
-  pname = "mdl";
-  gemdir = ./.;
-  exes = [ "mdl" ];
-}
-```
-
-All that's left to do is to generate the corresponding `Gemfile.lock` and
-`gemset.nix` as described above in the `Using an existing Gemfile` section.
-
-##### Packaging executables that require wrapping
-
-Sometimes your app will depend on other executables at runtime, and tries to
-find it through the `PATH` environment variable.
-
-In this case, you can provide a `postBuild` hook to `bundlerApp` that wraps the
-gem in another script that prefixes the `PATH`.
-
-Of course you could also make a custom `gemConfig` if you know exactly how to
-patch it, but it's usually much easier to maintain with a simple wrapper so the
-patch doesn't have to be adjusted for each version.
-
-Here's another example:
-
-```nix
-{ lib, bundlerApp, makeWrapper, git, gnutar, gzip }:
-
-bundlerApp {
-  pname = "r10k";
-  gemdir = ./.;
-  exes = [ "r10k" ];
-
-  buildInputs = [ makeWrapper ];
-
-  postBuild = ''
-    wrapProgram $out/bin/r10k --prefix PATH : ${lib.makeBinPath [ git gnutar gzip ]}
-  '';
-}
-```
--- a/doc/languages-frameworks/ruby.xml
+++ b/doc/languages-frameworks/ruby.xml
@ -1,108 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-language-ruby">
- <title>Ruby</title>
-
- <para>
-  There currently is support to bundle applications that are packaged as Ruby gems. The utility "bundix" allows you to write a <filename>Gemfile</filename>, let bundler create a <filename>Gemfile.lock</filename>, and then convert this into a nix expression that contains all Gem dependencies automatically.
- </para>
-
- <para>
-  For example, to package sensu, we did:
- </para>
-
-<screen>
-<![CDATA[$ cd pkgs/servers/monitoring
-$ mkdir sensu
-$ cd sensu
-$ cat > Gemfile
-source 'https://rubygems.org'
-gem 'sensu'
-$ $(nix-build '<nixpkgs>' -A bundix --no-out-link)/bin/bundix --magic
-$ cat > default.nix
-{ lib, bundlerEnv, ruby }:
-
-bundlerEnv rec {
-  name = "sensu-${version}";
-
-  version = (import gemset).sensu.version;
-  inherit ruby;
-  # expects Gemfile, Gemfile.lock and gemset.nix in the same directory
-  gemdir = ./.;
-
-  meta = with lib; {
-    description = "A monitoring framework that aims to be simple, malleable, and scalable";
-    homepage    = "http://sensuapp.org/";
-    license     = with licenses; mit;
-    maintainers = with maintainers; [ theuni ];
-    platforms   = platforms.unix;
-  };
-}]]>
-</screen>
-
- <para>
-  Please check in the <filename>Gemfile</filename>, <filename>Gemfile.lock</filename> and the <filename>gemset.nix</filename> so future updates can be run easily.
- </para>
-
- <para>
-  Updating Ruby packages can then be done like this:
- </para>
-
-<screen>
-<![CDATA[$ cd pkgs/servers/monitoring/sensu
-$ nix-shell -p bundler --run 'bundle lock --update'
-$ nix-shell -p bundix --run 'bundix'
-]]>
-</screen>
-
- <para>
-  For tools written in Ruby - i.e. where the desire is to install a package and then execute e.g. <command>rake</command> at the command line, there is an alternative builder called <literal>bundlerApp</literal>. Set up the <filename>gemset.nix</filename> the same way, and then, for example:
- </para>
-
-<screen>
-<![CDATA[{ lib, bundlerApp }:
-
-bundlerApp {
-  pname = "corundum";
-  gemdir = ./.;
-  exes = [ "corundum-skel" ];
-
-  meta = with lib; {
-    description = "Tool and libraries for maintaining Ruby gems.";
-    homepage    = "https://github.com/nyarly/corundum";
-    license     = licenses.mit;
-    maintainers = [ maintainers.nyarly ];
-    platforms   = platforms.unix;
-  };
-}]]>
-</screen>
-
- <para>
-  The chief advantage of <literal>bundlerApp</literal> over <literal>bundlerEnv</literal> is the executables introduced in the environment are precisely those selected in the <literal>exes</literal> list, as opposed to <literal>bundlerEnv</literal> which adds all the executables made available by gems in the gemset, which can mean e.g. <command>rspec</command> or <command>rake</command> in unpredictable versions available from various packages.
- </para>
-
- <para>
-  Resulting derivations for both builders also have two helpful attributes, <literal>env</literal> and <literal>wrappedRuby</literal>. The first one allows one to quickly drop into <command>nix-shell</command> with the specified environment present. E.g. <command>nix-shell -A sensu.env</command> would give you an environment with Ruby preset so it has all the libraries necessary for <literal>sensu</literal> in its paths. The second one can be used to make derivations from custom Ruby scripts which have <filename>Gemfile</filename>s with their dependencies specified. It is a derivation with <command>ruby</command> wrapped so it can find all the needed dependencies. For example, to make a derivation <literal>my-script</literal> for a <filename>my-script.rb</filename> (which should be placed in <filename>bin</filename>) you should run <command>bundix</command> as specified above and then use <literal>bundlerEnv</literal> like this:
- </para>
-
-<programlisting>
-<![CDATA[let env = bundlerEnv {
-  name = "my-script-env";
-
-  inherit ruby;
-  gemfile = ./Gemfile;
-  lockfile = ./Gemfile.lock;
-  gemset = ./gemset.nix;
-};
-
-in stdenv.mkDerivation {
-  name = "my-script";
-  buildInputs = [ env.wrappedRuby ];
-  script = ./my-script.rb;
-  buildCommand = ''
-    install -D -m755 $script $out/bin/my-script
-    patchShebangs $out/bin/my-script
-  '';
-}]]>
-</programlisting>
-</section>
--- a/doc/languages-frameworks/rust.section.md
+++ b/doc/languages-frameworks/rust.section.md
@ -1,428 +0,0 @@
---
-title: Rust
-author: Matthias Beyer
-date: 2017-03-05
---
-
-# Rust
-
-To install the rust compiler and cargo put
-
-```
-rustc
-cargo
-```
-
-into the `environment.systemPackages` or bring them into
-scope with `nix-shell -p rustc cargo`.
-
-For daily builds (beta and nightly) use either rustup from
-nixpkgs or use the [Rust nightlies
-overlay](#using-the-rust-nightlies-overlay).
-
-## Compiling Rust applications with Cargo
-
-Rust applications are packaged by using the `buildRustPackage` helper from `rustPlatform`:
-
-```
-rustPlatform.buildRustPackage rec {
-  pname = "ripgrep";
-  version = "11.0.2";
-
-  src = fetchFromGitHub {
-    owner = "BurntSushi";
-    repo = pname;
-    rev = version;
-    sha256 = "1iga3320mgi7m853la55xip514a3chqsdi1a1rwv25lr9b1p7vd3";
-  };
-
-  cargoSha256 = "17ldqr3asrdcsh4l29m3b5r37r5d0b3npq1lrgjmxb6vlx6a36qh";
-
-  meta = with stdenv.lib; {
-    description = "A fast line-oriented regex search tool, similar to ag and ack";
-    homepage = "https://github.com/BurntSushi/ripgrep";
-    license = licenses.unlicense;
-    maintainers = [ maintainers.tailhook ];
-    platforms = platforms.all;
-  };
-}
-```
-
-`buildRustPackage` requires a `cargoSha256` attribute which is computed over
-all crate sources of this package. Currently it is obtained by inserting a
-fake checksum into the expression and building the package once. The correct
-checksum can be then take from the failed build.
-
-Per the instructions in the [Cargo Book](https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html)
-best practices guide, Rust applications should always commit the `Cargo.lock`
-file in git to ensure a reproducible build. However, a few packages do not, and
-Nix depends on this file, so if it missing you can use `cargoPatches` to apply
-it in the `patchPhase`. Consider sending a PR upstream with a note to the
-maintainer describing why it's important to include in the application.
-
-The fetcher will verify that the `Cargo.lock` file is in sync with the `src`
-attribute, and fail the build if not. It will also will compress the vendor
-directory into a tar.gz archive.
-
-### Building a crate for a different target
-
-To build your crate with a different cargo `--target` simply specify the `target` attribute:
-
-```nix
-pkgs.rustPlatform.buildRustPackage {
-  (...)
-  target = "x86_64-fortanix-unknown-sgx";
-}
-```
-
-### Building a crate with an absent or out-of-date Cargo.lock file
-
-`buildRustPackage` needs a `Cargo.lock` file to get all dependencies in the
-source code in a reproducible way. If it is missing or out-of-date one can use
-the `cargoPatches` attribute to update or add it.
-
-```
-{ lib, rustPlatform, fetchFromGitHub }:
-
-rustPlatform.buildRustPackage rec {
-  (...)
-  cargoPatches = [
-    # a patch file to add/update Cargo.lock in the source code
-    ./add-Cargo.lock.patch
-  ];
-}
-```
-
-## Compiling Rust crates using Nix instead of Cargo
-
-### Simple operation
-
-When run, `cargo build` produces a file called `Cargo.lock`,
-containing pinned versions of all dependencies. Nixpkgs contains a
-tool called `carnix` (`nix-env -iA nixos.carnix`), which can be used
-to turn a `Cargo.lock` into a Nix expression.
-
-That Nix expression calls `rustc` directly (hence bypassing Cargo),
-and can be used to compile a crate and all its dependencies. Here is
-an example for a minimal `hello` crate:
-
-
-    $ cargo new hello
-    $ cd hello
-    $ cargo build
-     Compiling hello v0.1.0 (file:///tmp/hello)
-      Finished dev [unoptimized + debuginfo] target(s) in 0.20 secs
-    $ carnix -o hello.nix --src ./. Cargo.lock --standalone
-    $ nix-build hello.nix -A hello_0_1_0
-
-Now, the file produced by the call to `carnix`, called `hello.nix`, looks like:
-
-```
-# Generated by carnix 0.6.5: carnix -o hello.nix --src ./. Cargo.lock --standalone
-{ lib, stdenv, buildRustCrate, fetchgit }:
-let kernel = stdenv.buildPlatform.parsed.kernel.name;
-    # ... (content skipped)
-in
-rec {
-  hello = f: hello_0_1_0 { features = hello_0_1_0_features { hello_0_1_0 = f; }; };
-  hello_0_1_0_ = { dependencies?[], buildDependencies?[], features?[] }: buildRustCrate {
-    crateName = "hello";
-    version = "0.1.0";
-    authors = [ "pe@pijul.org <pe@pijul.org>" ];
-    src = ./.;
-    inherit dependencies buildDependencies features;
-  };
-  hello_0_1_0 = { features?(hello_0_1_0_features {}) }: hello_0_1_0_ {};
-  hello_0_1_0_features = f: updateFeatures f (rec {
-        hello_0_1_0.default = (f.hello_0_1_0.default or true);
-    }) [ ];
-}
-```
-
-In particular, note that the argument given as `--src` is copied
-verbatim to the source. If we look at a more complicated
-dependencies, for instance by adding a single line `libc="*"` to our
-`Cargo.toml`, we first need to run `cargo build` to update the
-`Cargo.lock`. Then, `carnix` needs to be run again, and produces the
-following nix file:
-
-```
-# Generated by carnix 0.6.5: carnix -o hello.nix --src ./. Cargo.lock --standalone
-{ lib, stdenv, buildRustCrate, fetchgit }:
-let kernel = stdenv.buildPlatform.parsed.kernel.name;
-    # ... (content skipped)
-in
-rec {
-  hello = f: hello_0_1_0 { features = hello_0_1_0_features { hello_0_1_0 = f; }; };
-  hello_0_1_0_ = { dependencies?[], buildDependencies?[], features?[] }: buildRustCrate {
-    crateName = "hello";
-    version = "0.1.0";
-    authors = [ "pe@pijul.org <pe@pijul.org>" ];
-    src = ./.;
-    inherit dependencies buildDependencies features;
-  };
-  libc_0_2_36_ = { dependencies?[], buildDependencies?[], features?[] }: buildRustCrate {
-    crateName = "libc";
-    version = "0.2.36";
-    authors = [ "The Rust Project Developers" ];
-    sha256 = "01633h4yfqm0s302fm0dlba469bx8y6cs4nqc8bqrmjqxfxn515l";
-    inherit dependencies buildDependencies features;
-  };
-  hello_0_1_0 = { features?(hello_0_1_0_features {}) }: hello_0_1_0_ {
-    dependencies = mapFeatures features ([ libc_0_2_36 ]);
-  };
-  hello_0_1_0_features = f: updateFeatures f (rec {
-    hello_0_1_0.default = (f.hello_0_1_0.default or true);
-    libc_0_2_36.default = true;
-  }) [ libc_0_2_36_features ];
-  libc_0_2_36 = { features?(libc_0_2_36_features {}) }: libc_0_2_36_ {
-    features = mkFeatures (features.libc_0_2_36 or {});
-  };
-  libc_0_2_36_features = f: updateFeatures f (rec {
-    libc_0_2_36.default = (f.libc_0_2_36.default or true);
-    libc_0_2_36.use_std =
-      (f.libc_0_2_36.use_std or false) ||
-      (f.libc_0_2_36.default or false) ||
-      (libc_0_2_36.default or false);
-  }) [];
-}
-```
-
-Here, the `libc` crate has no `src` attribute, so `buildRustCrate`
-will fetch it from [crates.io](https://crates.io). A `sha256`
-attribute is still needed for Nix purity.
-
-### Handling external dependencies
-
-Some crates require external libraries. For crates from
-[crates.io](https://crates.io), such libraries can be specified in
-`defaultCrateOverrides` package in nixpkgs itself.
-
-Starting from that file, one can add more overrides, to add features
-or build inputs by overriding the hello crate in a seperate file.
-
-```
-with import <nixpkgs> {};
-((import ./hello.nix).hello {}).override {
-  crateOverrides = defaultCrateOverrides // {
-    hello = attrs: { buildInputs = [ openssl ]; };
-  };
-}
-```
-
-Here, `crateOverrides` is expected to be a attribute set, where the
-key is the crate name without version number and the value a function.
-The function gets all attributes passed to `buildRustCrate` as first
-argument and returns a set that contains all attribute that should be
-overwritten.
-
-For more complicated cases, such as when parts of the crate's
-derivation depend on the crate's version, the `attrs` argument of
-the override above can be read, as in the following example, which
-patches the derivation:
-
-```
-with import <nixpkgs> {};
-((import ./hello.nix).hello {}).override {
-  crateOverrides = defaultCrateOverrides // {
-    hello = attrs: lib.optionalAttrs (lib.versionAtLeast attrs.version "1.0")  {
-      postPatch = ''
-        substituteInPlace lib/zoneinfo.rs \
-          --replace "/usr/share/zoneinfo" "${tzdata}/share/zoneinfo"
-      '';
-    };
-  };
-}
-```
-
-Another situation is when we want to override a nested
-dependency. This actually works in the exact same way, since the
-`crateOverrides` parameter is forwarded to the crate's
-dependencies. For instance, to override the build inputs for crate
-`libc` in the example above, where `libc` is a dependency of the main
-crate, we could do:
-
-```
-with import <nixpkgs> {};
-((import hello.nix).hello {}).override {
-  crateOverrides = defaultCrateOverrides // {
-    libc = attrs: { buildInputs = []; };
-  };
-}
-```
-
-### Options and phases configuration
-
-Actually, the overrides introduced in the previous section are more
-general. A number of other parameters can be overridden:
-
- The version of rustc used to compile the crate:
-
-  ```
-  (hello {}).override { rust = pkgs.rust; };
-  ```
-
- Whether to build in release mode or debug mode (release mode by
-  default):
-
-  ```
-  (hello {}).override { release = false; };
-  ```
-
- Whether to print the commands sent to rustc when building
-  (equivalent to `--verbose` in cargo:
-
-  ```
-  (hello {}).override { verbose = false; };
-  ```
-
- Extra arguments to be passed to `rustc`:
-
-  ```
-  (hello {}).override { extraRustcOpts = "-Z debuginfo=2"; };
-  ```
-
- Phases, just like in any other derivation, can be specified using
-  the following attributes: `preUnpack`, `postUnpack`, `prePatch`,
-  `patches`, `postPatch`, `preConfigure` (in the case of a Rust crate,
-  this is run before calling the "build" script), `postConfigure`
-  (after the "build" script),`preBuild`, `postBuild`, `preInstall` and
-  `postInstall`. As an example, here is how to create a new module
-  before running the build script:
-
-  ```
-  (hello {}).override {
-    preConfigure = ''
-       echo "pub const PATH=\"${hi.out}\";" >> src/path.rs"
-    '';
-  };
-  ```
-
-### Features
-
-One can also supply features switches. For example, if we want to
-compile `diesel_cli` only with the `postgres` feature, and no default
-features, we would write:
-
-```
-(callPackage ./diesel.nix {}).diesel {
-  default = false;
-  postgres = true;
-}
-```
-
-Where `diesel.nix` is the file generated by Carnix, as explained above.
-
-
-## Setting Up `nix-shell`
-Oftentimes you want to develop code from within `nix-shell`. Unfortunately
-`buildRustCrate` does not support common `nix-shell` operations directly
-(see [this issue](https://github.com/NixOS/nixpkgs/issues/37945))
-so we will use `stdenv.mkDerivation` instead.
-
-Using the example `hello` project above, we want to do the following:
- Have access to `cargo` and `rustc`
- Have the `openssl` library available to a crate through it's _normal_
-  compilation mechanism (`pkg-config`).
-
-A typical `shell.nix` might look like:
-
-```
-with import <nixpkgs> {};
-
-stdenv.mkDerivation {
-  name = "rust-env";
-  nativeBuildInputs = [
-    rustc cargo
-
-    # Example Build-time Additional Dependencies
-    pkgconfig
-  ];
-  buildInputs = [
-    # Example Run-time Additional Dependencies
-    openssl
-  ];
-
-  # Set Environment Variables
-  RUST_BACKTRACE = 1;
-}
-```
-
-You should now be able to run the following:
-```
-$ nix-shell --pure
-$ cargo build
-$ cargo test
-```
-
-### Controlling Rust Version Inside `nix-shell`
-To control your rust version (i.e. use nightly) from within `shell.nix` (or
-other nix expressions) you can use the following `shell.nix`
-
-```
-# Latest Nightly
-with import <nixpkgs> {};
-let src = fetchFromGitHub {
-      owner = "mozilla";
-      repo = "nixpkgs-mozilla";
-      # commit from: 2019-05-15
-      rev = "9f35c4b09fd44a77227e79ff0c1b4b6a69dff533";
-      sha256 = "18h0nvh55b5an4gmlgfbvwbyqj91bklf1zymis6lbdh75571qaz0";
-   };
-in
-with import "${src.out}/rust-overlay.nix" pkgs pkgs;
-stdenv.mkDerivation {
-  name = "rust-env";
-  buildInputs = [
-    # Note: to use use stable, just replace `nightly` with `stable`
-    latest.rustChannels.nightly.rust
-
-    # Add some extra dependencies from `pkgs`
-    pkgconfig openssl
-  ];
-
-  # Set Environment Variables
-  RUST_BACKTRACE = 1;
-}
-```
-
-Now run:
-```
-$ rustc --version
-rustc 1.26.0-nightly (188e693b3 2018-03-26)
-```
-
-To see that you are using nightly.
-
-
-## Using the Rust nightlies overlay
-
-Mozilla provides an overlay for nixpkgs to bring a nightly version of Rust into scope.
-This overlay can _also_ be used to install recent unstable or stable versions
-of Rust, if desired.
-
-To use this overlay, clone
-[nixpkgs-mozilla](https://github.com/mozilla/nixpkgs-mozilla),
-and create a symbolic link to the file
-[rust-overlay.nix](https://github.com/mozilla/nixpkgs-mozilla/blob/master/rust-overlay.nix)
-in the `~/.config/nixpkgs/overlays` directory.
-
-    $ git clone https://github.com/mozilla/nixpkgs-mozilla.git
-    $ mkdir -p ~/.config/nixpkgs/overlays
-    $ ln -s $(pwd)/nixpkgs-mozilla/rust-overlay.nix ~/.config/nixpkgs/overlays/rust-overlay.nix
-
-The latest version can be installed with the following command:
-
-    $ nix-env -Ai nixos.latest.rustChannels.stable.rust
-
-Or using the attribute with nix-shell:
-
-    $ nix-shell -p nixos.latest.rustChannels.stable.rust
-
-To install the beta or nightly channel, "stable" should be substituted by
-"nightly" or "beta", or
-use the function provided by this overlay to pull a version based on a
-build date.
-
-The overlay automatically updates itself as it uses the same source as
-[rustup](https://www.rustup.rs/).
--- a/doc/languages-frameworks/texlive.xml
+++ b/doc/languages-frameworks/texlive.xml
@ -1,152 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-language-texlive">
- <title>TeX Live</title>
-
- <para>
-  Since release 15.09 there is a new TeX Live packaging that lives entirely under attribute <varname>texlive</varname>.
- </para>
-
- <section xml:id="sec-language-texlive-users-guide">
-  <title>User's guide</title>
-
-  <itemizedlist>
-   <listitem>
-    <para>
-     For basic usage just pull <varname>texlive.combined.scheme-basic</varname> for an environment with basic LaTeX support.
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     It typically won't work to use separately installed packages together. Instead, you can build a custom set of packages like this:
-<programlisting>
-texlive.combine {
-  inherit (texlive) scheme-small collection-langkorean algorithms cm-super;
-}
-</programlisting>
-     There are all the schemes, collections and a few thousand packages, as defined upstream (perhaps with tiny differences).
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     By default you only get executables and files needed during runtime, and a little documentation for the core packages. To change that, you need to add <varname>pkgFilter</varname> function to <varname>combine</varname>.
-<programlisting>
-texlive.combine {
-  # inherit (texlive) whatever-you-want;
-  pkgFilter = pkg:
-    pkg.tlType == "run" || pkg.tlType == "bin" || pkg.pname == "cm-super";
-  # elem tlType [ "run" "bin" "doc" "source" ]
-  # there are also other attributes: version, name
-}
-</programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     You can list packages e.g. by <command>nix repl</command>.
-<programlisting><![CDATA[
-$ nix repl
-nix-repl> :l <nixpkgs>
-nix-repl> texlive.collection-<TAB>
-]]></programlisting>
-    </para>
-   </listitem>
-   <listitem>
-    <para>
-     Note that the wrapper assumes that the result has a chance to be useful. For example, the core executables should be present, as well as some core data files. The supported way of ensuring this is by including some scheme, for example <varname>scheme-basic</varname>, into the combination.
-    </para>
-   </listitem>
-  </itemizedlist>
- </section>
-
- <section xml:id="sec-language-texlive-custom-packages">
-  <title>Custom packages</title>
-  <para>
-    You may find that you need to use an external TeX package. A derivation for such package has to provide contents of the "texmf" directory in its output and provide the <varname>tlType</varname> attribute. Here is a (very verbose) example:
-<programlisting><![CDATA[
-with import <nixpkgs> {};
-
-let
-  foiltex_run = stdenvNoCC.mkDerivation {
-    pname = "latex-foiltex";
-    version = "2.1.4b";
-    passthru.tlType = "run";
-
-    srcs = [
-      (fetchurl {
-        url = "http://mirrors.ctan.org/macros/latex/contrib/foiltex/foiltex.dtx";
-        sha256 = "07frz0krpz7kkcwlayrwrj2a2pixmv0icbngyw92srp9fp23cqpz";
-      })
-      (fetchurl {
-        url = "http://mirrors.ctan.org/macros/latex/contrib/foiltex/foiltex.ins";
-        sha256 = "09wkyidxk3n3zvqxfs61wlypmbhi1pxmjdi1kns9n2ky8ykbff99";
-      })
-    ];
-
-    unpackPhase = ''
-      runHook preUnpack
-
-      for _src in $srcs; do
-        cp "$_src" $(stripHash "$_src")
-      done
-
-      runHook postUnpack
-    '';
-
-    nativeBuildInputs = [ texlive.combined.scheme-small ];
-
-    dontConfigure = true;
-
-    buildPhase = ''
-      runHook preBuild
-
-      # Generate the style files
-      latex foiltex.ins
-
-      runHook postBuild
-    '';
-
-    installPhase = ''
-      runHook preInstall
-
-      path="$out/tex/latex/foiltex"
-      mkdir -p "$path"
-      cp *.{cls,def,clo} "$path/"
-
-      runHook postInstall
-    '';
-
-    meta = with lib; {
-      description = "A LaTeX2e class for overhead transparencies";
-      license = licenses.unfreeRedistributable;
-      maintainers = with maintainers; [ veprbl ];
-      platforms = platforms.all;
-    };
-  };
-  foiltex = { pkgs = [ foiltex_run ]; };
-
-  latex_with_foiltex = texlive.combine {
-    inherit (texlive) scheme-small;
-    inherit foiltex;
-  };
-in
-  runCommand "test.pdf" {
-    nativeBuildInputs = [ latex_with_foiltex ];
-  } ''
-cat >test.tex <<EOF
-\documentclass{foils}
-
-\title{Presentation title}
-\date{}
-
-\begin{document}
-\maketitle
-\end{document}
-EOF
-  pdflatex test.tex
-  cp test.pdf $out
-''
-]]></programlisting>
-  </para>
- </section>
-</section>
--- a/doc/languages-frameworks/titanium.section.md
+++ b/doc/languages-frameworks/titanium.section.md
@ -1,115 +0,0 @@
---
-title: Titanium
-author: Sander van der Burg
-date: 2018-11-18
---
-# Titanium
-
-The Nixpkgs repository contains facilities to deploy a variety of versions of
-the [Titanium SDK](https://www.appcelerator.com) versions, a cross-platform
-mobile app development framework using JavaScript as an implementation language,
-and includes a function abstraction making it possible to build Titanium
-applications for Android and iOS devices from source code.
-
-Not all Titanium features supported -- currently, it can only be used to build
-Android and iOS apps.
-
-Building a Titanium app
-----------------------
-We can build a Titanium app from source for Android or iOS and for debugging or
-release purposes by invoking the `titaniumenv.buildApp {}` function:
-
-```nix
-titaniumenv.buildApp {
-  name = "myapp";
-  src = ./myappsource;
-
-  preBuild = "";
-  target = "android"; # or 'iphone'
-  tiVersion = "7.1.0.GA";
-  release = true;
-
-  androidsdkArgs = {
-    platformVersions = [ "25" "26" ];
-  };
-  androidKeyStore = ./keystore;
-  androidKeyAlias = "myfirstapp";
-  androidKeyStorePassword = "secret";
-
-  xcodeBaseDir = "/Applications/Xcode.app";
-  xcodewrapperArgs = {
-    version = "9.3";
-  };
-  iosMobileProvisioningProfile = ./myprovisioning.profile;
-  iosCertificateName = "My Company";
-  iosCertificate = ./mycertificate.p12;
-  iosCertificatePassword = "secret";
-  iosVersion = "11.3";
-  iosBuildStore = false;
-
-  enableWirelessDistribution = true;
-  installURL = "/installipa.php";
-}
-```
-
-The `titaniumenv.buildApp {}` function takes the following parameters:
-
-* The `name` parameter refers to the name in the Nix store.
-* The `src` parameter refers to the source code location of the app that needs
-  to be built.
-* `preRebuild` contains optional build instructions that are carried out before
-  the build starts.
-* `target` indicates for which device the app must be built. Currently only
-  'android' and 'iphone' (for iOS) are supported.
-* `tiVersion` can be used to optionally override the requested Titanium version
-  in `tiapp.xml`. If not specified, it will use the version in `tiapp.xml`.
-* `release` should be set to true when building an app for submission to the
-  Google Playstore or Apple Appstore. Otherwise, it should be false.
-
-When the `target` has been set to `android`, we can configure the following
-parameters:
-
-* The `androidSdkArgs` parameter refers to an attribute set that propagates all
-  parameters to the `androidenv.composeAndroidPackages {}` function. This can
-  be used to install all relevant Android plugins that may be needed to perform
-  the Android build. If no parameters are given, it will deploy the platform
-  SDKs for API-levels 25 and 26 by default.
-
-When the `release` parameter has been set to true, you need to provide
-parameters to sign the app:
-
-* `androidKeyStore` is the path to the keystore file
-* `androidKeyAlias` is the key alias
-* `androidKeyStorePassword` refers to the password to open the keystore file.
-
-When the `target` has been set to `iphone`, we can configure the following
-parameters:
-
-* The `xcodeBaseDir` parameter refers to the location where Xcode has been
-  installed. When none value is given, the above value is the default.
-* The `xcodewrapperArgs` parameter passes arbitrary parameters to the
-  `xcodeenv.composeXcodeWrapper {}` function. This can, for example, be used
-  to adjust the default version of Xcode.
-
-When `release` has been set to true, you also need to provide the following
-parameters:
-
-* `iosMobileProvisioningProfile` refers to a mobile provisioning profile needed
-  for signing.
-* `iosCertificateName` refers to the company name in the P12 certificate.
-* `iosCertificate` refers to the path to the P12 file.
-* `iosCertificatePassword` contains the password to open the P12 file.
-* `iosVersion` refers to the iOS SDK version to use. It defaults to the latest
-  version.
-* `iosBuildStore` should be set to `true` when building for the Apple Appstore
-  submission. For enterprise or ad-hoc builds it should be set to `false`.
-
-When `enableWirelessDistribution` has been enabled, you must also provide the
-path of the PHP script (`installURL`) (that is included with the iOS build
-environment) to enable wireless ad-hoc installations.
-
-Emulating or simulating the app
-------------------------------
-It is also possible to simulate the correspond iOS simulator build by using
-`xcodeenv.simulateApp {}` and emulate an Android APK by using
-`androidenv.emulateApp {}`.
--- a/doc/languages-frameworks/vim.section.md
+++ b/doc/languages-frameworks/vim.section.md
@ -1,272 +0,0 @@
---
-title: User's Guide for Vim in Nixpkgs
-author: Marc Weber
-date: 2016-06-25
---
-# Vim
-
-Both Neovim and Vim can be configured to include your favorite plugins
-and additional libraries.
-
-Loading can be deferred; see examples.
-
-At the moment we support three different methods for managing plugins:
-
- Vim packages (*recommend*)
- VAM (=vim-addon-manager)
- Pathogen
- vim-plug
-
-## Custom configuration
-
-Adding custom .vimrc lines can be done using the following code:
-
-```nix
-vim_configurable.customize {
-  # `name` specifies the name of the executable and package
-  name = "vim-with-plugins";
-
-  vimrcConfig.customRC = ''
-    set hidden
-  '';
-}
-```
-
-This configuration is used when Vim is invoked with the command specified as name, in this case `vim-with-plugins`.
-
-For Neovim the `configure` argument can be overridden to achieve the same:
-
-```nix
-neovim.override {
-  configure = {
-    customRC = ''
-      # here your custom configuration goes!
-    '';
-  };
-}
-```
-
-If you want to use `neovim-qt` as a graphical editor, you can configure it by overriding Neovim in an overlay
-or passing it an overridden Neovimn:
-
-```nix
-neovim-qt.override {
-  neovim = neovim.override {
-    configure = {
-      customRC = ''
-        # your custom configuration
-      '';
-    };
-  };
-}
-```
-
-## Managing plugins with Vim packages
-
-To store you plugins in Vim packages (the native Vim plugin manager, see `:help packages`) the following example can be used:
-
-```nix
-vim_configurable.customize {
-  vimrcConfig.packages.myVimPackage = with pkgs.vimPlugins; {
-    # loaded on launch
-    start = [ youcompleteme fugitive ];
-    # manually loadable by calling `:packadd $plugin-name`
-    # however, if a Vim plugin has a dependency that is not explicitly listed in
-    # opt that dependency will always be added to start to avoid confusion.
-    opt = [ phpCompletion elm-vim ];
-    # To automatically load a plugin when opening a filetype, add vimrc lines like:
-    # autocmd FileType php :packadd phpCompletion
-  };
-}
-```
-
-`myVimPackage` is an arbitrary name for the generated package. You can choose any name you like.
-For Neovim the syntax is:
-
-```nix
-neovim.override {
-  configure = {
-    customRC = ''
-      # here your custom configuration goes!
-    '';
-    packages.myVimPackage = with pkgs.vimPlugins; {
-      # see examples below how to use custom packages
-      start = [ ];
-      # If a Vim plugin has a dependency that is not explicitly listed in
-      # opt that dependency will always be added to start to avoid confusion.
-      opt = [ ];
-    };
-  };
-}
-```
-
-The resulting package can be added to `packageOverrides` in `~/.nixpkgs/config.nix` to make it installable:
-
-```nix
-{
-  packageOverrides = pkgs: with pkgs; {
-    myVim = vim_configurable.customize {
-      # `name` specifies the name of the executable and package
-      name = "vim-with-plugins";
-      # add here code from the example section
-    };
-    myNeovim = neovim.override {
-      configure = {
-      # add here code from the example section
-      };
-    };
-  };
-}
-```
-
-After that you can install your special grafted `myVim` or `myNeovim` packages.
-
-## Managing plugins with vim-plug
-
-To use [vim-plug](https://github.com/junegunn/vim-plug) to manage your Vim
-plugins the following example can be used:
-
-```nix
-vim_configurable.customize {
-  vimrcConfig.packages.myVimPackage = with pkgs.vimPlugins; {
-    # loaded on launch
-    plug.plugins = [ youcompleteme fugitive phpCompletion elm-vim ];
-  };
-}
-```
-
-For Neovim the syntax is:
-
-```nix
-neovim.override {
-  configure = {
-    customRC = ''
-      # here your custom configuration goes!
-    '';
-    plug.plugins = with pkgs.vimPlugins; [
-      vim-go
-    ];
-  };
-}
-```
-
-## Managing plugins with VAM
-
-### Handling dependencies of Vim plugins
-
-VAM introduced .json files supporting dependencies without versioning
-assuming that "using latest version" is ok most of the time.
-
-### Example
-
-First create a vim-scripts file having one plugin name per line. Example:
-
-```
-"tlib"
-{'name': 'vim-addon-sql'}
-{'filetype_regex': '\%(vim)$', 'names': ['reload', 'vim-dev-plugin']}
-```
-
-Such vim-scripts file can be read by VAM as well like this:
-
-```vim
-call vam#Scripts(expand('~/.vim-scripts'), {})
-```
-
-Create a default.nix file:
-
-```nix
-{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7102" }:
-nixpkgs.vim_configurable.customize { name = "vim"; vimrcConfig.vam.pluginDictionaries = [ "vim-addon-vim2nix" ]; }
-```
-
-Create a generate.vim file:
-
-```vim
-ActivateAddons vim-addon-vim2nix
-let vim_scripts = "vim-scripts"
-call nix#ExportPluginsForNix({
-\  'path_to_nixpkgs': eval('{"'.substitute(substitute(substitute($NIX_PATH, ':', ',', 'g'), '=',':', 'g'), '\([:,]\)', '"\1"',"g").'"}')["nixpkgs"],
-\  'cache_file': '/tmp/vim2nix-cache',
-\  'try_catch': 0,
-\  'plugin_dictionaries': ["vim-addon-manager"]+map(readfile(vim_scripts), 'eval(v:val)')
-\ })
-```
-
-Then run
-
-```bash
-nix-shell -p vimUtils.vim_with_vim2nix --command "vim -c 'source generate.vim'"
-```
-
-You should get a Vim buffer with the nix derivations (output1) and vam.pluginDictionaries (output2).
-You can add your Vim to your system's configuration file like this and start it by "vim-my":
-
-```
-my-vim =
-  let plugins = let inherit (vimUtils) buildVimPluginFrom2Nix; in {
-    copy paste output1 here
-  }; in vim_configurable.customize {
-    name = "vim-my";
-
-    vimrcConfig.vam.knownPlugins = plugins; # optional
-    vimrcConfig.vam.pluginDictionaries = [
-       copy paste output2 here
-    ];
-
-    # Pathogen would be
-    # vimrcConfig.pathogen.knownPlugins = plugins; # plugins
-    # vimrcConfig.pathogen.pluginNames = ["tlib"];
-  };
-```
-
-Sample output1:
-
-```
-"reload" = buildVimPluginFrom2Nix { # created by nix#NixDerivation
-  name = "reload";
-  src = fetchgit {
-    url = "git://github.com/xolox/vim-reload";
-    rev = "0a601a668727f5b675cb1ddc19f6861f3f7ab9e1";
-    sha256 = "0vb832l9yxj919f5hfg6qj6bn9ni57gnjd3bj7zpq7d4iv2s4wdh";
-  };
-  dependencies = ["nim-misc"];
-
-};
-[...]
-```
-
-Sample output2:
-
-```nix
-[
-  ''vim-addon-manager''
-  ''tlib''
-  { "name" = ''vim-addon-sql''; }
-  { "filetype_regex" = ''\%(vim)$$''; "names" = [ ''reload'' ''vim-dev-plugin'' ]; }
-]
-```
-
-## Adding new plugins to nixpkgs
-
-Nix expressions for Vim plugins are stored in [pkgs/misc/vim-plugins](/pkgs/misc/vim-plugins). For the vast majority of plugins, Nix expressions are automatically generated by running [`./update.py`](/pkgs/misc/vim-plugins/update.py). This creates a [generated.nix](/pkgs/misc/vim-plugins/generated.nix) file based on the plugins listed in [vim-plugin-names](/pkgs/misc/vim-plugins/vim-plugin-names). Plugins are listed in alphabetical order in `vim-plugin-names` using the format `[github username]/[repository]`. For example https://github.com/scrooloose/nerdtree becomes `scrooloose/nerdtree`.
-
-Some plugins require overrides in order to function properly. Overrides are placed in [overrides.nix](/pkgs/misc/vim-plugins/overrides.nix). Overrides are most often required when a plugin requires some dependencies, or extra steps are required during the build process. For example `deoplete-fish` requires both `deoplete-nvim` and `vim-fish`, and so the following override was added:
-
-```
-deoplete-fish = super.deoplete-fish.overrideAttrs(old: {
-  dependencies = with super; [ deoplete-nvim vim-fish ];
-});
-```
-
-Sometimes plugins require an override that must be changed when the plugin is updated. This can cause issues when Vim plugins are auto-updated but the associated override isn't updated. For these plugins, the override should be written so that it specifies all information required to install the plugin, and running `./update.py` doesn't change the derivation for the plugin. Manually updating the override is required to update these types of plugins. An example of such a plugin is `LanguageClient-neovim`.
-
-To add a new plugin, run `./update.py --add "[owner]/[name]"`. **NOTE**: This script automatically commits to your git repository. Be sure to check out a fresh branch before running.
-
-## Important repositories
-
- [vim-pi](https://bitbucket.org/vimcommunity/vim-pi) is a plugin repository
-  from VAM plugin manager meant to be used by others as well used by
-
- [vim2nix](https://github.com/MarcWeber/vim-addon-vim2nix) which generates the
-  .nix code
--- a/doc/manual.xml
+++ b/doc/manual.xml
@ -1,41 +1,37 @@
 <book xmlns="http://docbook.org/ns/docbook"
      xmlns:xi="http://www.w3.org/2001/XInclude">
- <info>
-  <title>Nixpkgs Users and Contributors Guide</title>
-  <subtitle>Version <xi:include href=".version" parse="text" />
-  </subtitle>
- </info>
- <xi:include href="preface.chapter.xml" />
- <part>
-  <title>Using Nixpkgs</title>
-  <xi:include href="using/configuration.xml" />
-  <xi:include href="using/overlays.xml" />
-  <xi:include href="using/overrides.xml" />
-  <xi:include href="functions.xml" />
- </part>
- <part>
-  <title>Standard environment</title>
-  <xi:include href="stdenv/stdenv.xml" />
-  <xi:include href="stdenv/meta.xml" />
-  <xi:include href="stdenv/multiple-output.xml" />
-  <xi:include href="stdenv/cross-compilation.xml" />
-  <xi:include href="stdenv/platform-notes.xml" />
- </part>
- <part>
-  <title>Builders</title>
-  <xi:include href="builders/fetchers.xml" />
-  <xi:include href="builders/trivial-builders.xml" />
-  <xi:include href="builders/special.xml" />
-  <xi:include href="builders/images.xml" />
-  <xi:include href="languages-frameworks/index.xml" />
-  <xi:include href="builders/packages/index.xml" />
- </part>
- <part>
-  <title>Contributing to Nixpkgs</title>
-  <xi:include href="contributing/quick-start.xml" />
-  <xi:include href="contributing/coding-conventions.xml" />
-  <xi:include href="contributing/submitting-changes.xml" />
-  <xi:include href="contributing/reviewing-contributions.xml" />
-  <xi:include href="contributing/contributing-to-documentation.xml" />
- </part>
+
+  <info>
+
+    <title>Nixpkgs Manual</title>
+
+    <subtitle>Draft (Version <xi:include href="../.version"
+    parse="text" />)</subtitle>
+
+    <author>
+      <personname>
+        <firstname>Eelco</firstname>
+        <surname>Dolstra</surname>
+      </personname>
+      <affiliation>
+        <orgname>LogicBlox</orgname>
+      </affiliation>
+    </author>
+
+    <copyright>
+      <year>2008-2012</year>
+      <holder>Eelco Dolstra</holder>
+    </copyright>
+
+  </info>
+
+  <xi:include href="introduction.xml" />
+  <xi:include href="quick-start.xml" />
+  <xi:include href="stdenv.xml" />
+  <xi:include href="meta.xml" />
+  <xi:include href="language-support.xml" />
+  <xi:include href="package-notes.xml" />
+  <xi:include href="coding-conventions.xml" />
+  
+        
 </book>
--- a/doc/meta.xml
+++ b/doc/meta.xml
@ -0,0 +1,294 @@
+<chapter xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xml:id="chap-meta">
+
+<title>Meta-attributes</title>
+
+<para>Nix packages can declare <emphasis>meta-attributes</emphasis>
+that contain information about a package such as a description, its
+homepage, its license, and so on.  For instance, the GNU Hello package
+has a <varname>meta</varname> declaration like this:
+
+<programlisting>
+meta = {
+  description = "A program that produces a familiar, friendly greeting";
+  longDescription = ''
+    GNU Hello is a program that prints "Hello, world!" when you run it.
+    It is fully customizable.
+  '';
+  homepage = http://www.gnu.org/software/hello/manual/;
+  license = "GPLv3+";
+};
+</programlisting>
+
+</para>
+
+<para>Meta-attributes are not passed to the builder of the package.
+Thus, a change to a meta-attribute doesn’t trigger a recompilation of
+the package.  The value of a meta-attribute must a string.</para>
+
+<para>The meta-attributes of a package can be queried from the
+command-line using <command>nix-env</command>:
+
+<screen>
+$ nix-env -qa hello --meta --xml
+&lt;?xml version='1.0' encoding='utf-8'?>
+&lt;items>
+  &lt;item attrPath="hello" name="hello-2.3" system="i686-linux">
+    &lt;meta name="description" value="A program that produces a familiar, friendly greeting" />
+    &lt;meta name="homepage" value="http://www.gnu.org/software/hello/manual/" />
+    &lt;meta name="license" value="GPLv3+" />
+    &lt;meta name="longDescription" value="GNU Hello is a program that prints &amp;quot;Hello, world!&amp;quot; when you run it.&amp;#xA;It is fully customizable.&amp;#xA;" />
+  &lt;/item>
+&lt;/items>
+</screen>
+
+<command>nix-env</command> knows about the
+<varname>description</varname> field specifically:
+
+<screen>
+$ nix-env -qa hello --description
+hello-2.3  A program that produces a familiar, friendly greeting
+</screen>
+
+</para>
+
+
+<section><title>Standard meta-attributes</title>
+
+<para>The following meta-attributes have a standard
+interpretation:</para>
+
+<variablelist>
+
+  <varlistentry>
+    <term><varname>description</varname></term>
+    <listitem><para>A short (one-line) description of the package.
+    This is shown by <command>nix-env -q --description</command> and
+    also on the Nixpkgs release pages.</para>
+
+    <para>Don’t include a period at the end.  Don’t include newline
+    characters.  Capitalise the first character.  For brevity, don’t
+    repeat the name of package — just describe what it does.</para>
+
+    <para>Wrong: <literal>"libpng is a library that allows you to decode PNG images."</literal></para>
+
+    <para>Right: <literal>"A library for decoding PNG images"</literal></para>
+
+    </listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>longDescription</varname></term>
+    <listitem><para>An arbitrarily long description of the
+    package.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>homepage</varname></term>
+    <listitem><para>The package’s homepage.  Example:
+    <literal>http://www.gnu.org/software/hello/manual/</literal></para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>license</varname></term>
+    <listitem><para>The license for the package.  See below for the
+    allowed values.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>maintainers</varname></term>
+    <listitem><para>A list of names and e-mail addresses of the
+    maintainers of this Nix expression, e.g. <literal>["Alice
+    &lt;alice@example.org>" "Bob &lt;bob@example.com>"]</literal>.  If
+    you are the maintainer of multiple packages, you may want to add
+    yourself to <link
+    xlink:href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/lib/maintainers.nix"><filename>pkgs/lib/maintainers.nix</filename></link>
+    and write something like <literal>[stdenv.lib.maintainers.alice
+    stdenv.lib.maintainers.bob]</literal>.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>priority</varname></term>
+    <listitem><para>The <emphasis>priority</emphasis> of the package,
+    used by <command>nix-env</command> to resolve file name conflicts
+    between packages.  See the Nix manual page for
+    <command>nix-env</command> for details.  Example:
+    <literal>"10"</literal> (a low-priority
+    package).</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>platforms</varname></term>
+    <listitem><para>The list of Nix platform types on which the
+    package is supported.  If this attribute is set, the package will
+    refuse to build, and won’t show up in <literal>nix-env
+    -qa</literal> output, on any platform not listed
+    here.  An example is:
+
+<programlisting>
+meta.platforms = [ "x86_64-linux" "i686-linux" "x86_64-darwin" ];
+</programlisting>
+
+    The set <varname>lib.platforms</varname> defines various common
+    lists of platforms types, so it’s more typical to write:
+
+<programlisting>
+meta.platforms = stdenv.lib.platforms.linux ++ stdenv.lib.platforms.darwin;
+</programlisting>
+
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>hydraPlatforms</varname></term>
+    <listitem><para>The list of Nix platform types for which the Hydra
+    instance at <literal>hydra.nixos.org</literal> should build the
+    package.  (Hydra is the Nix-based continuous build system.)  It
+    defaults to the value of <varname>meta.platforms</varname>.  Thus,
+    the only reason to set <varname>meta.hydraPlatforms</varname> is
+    if you want <literal>hydra.nixos.org</literal> to build the
+    package on a subset of <varname>meta.platforms</varname>, or not
+    at all, e.g.
+
+<programlisting>
+meta.platforms = stdenv.lib.platforms.linux;
+meta.hydraPlatforms = [];
+</programlisting>
+
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>broken</varname></term>
+    <listitem><para>If set to <literal>true</literal>, the package is
+    marked as “broken”, meaning that it won’t show up in
+    <literal>nix-env -qa</literal>, and cannot be built or installed.
+    Sush packages should be removed from Nixpkgs eventually unless
+    they are fixed.</para></listitem>
+  </varlistentry>
+
+</variablelist>
+
+
+</section>
+
+
+<section xml:id="sec-meta-license"><title>Licenses</title>
+
+<note><para>This is just a first attempt at standardising the license
+attribute.</para></note>
+
+<para>The <varname>meta.license</varname> attribute must be one of the
+following:
+
+<variablelist>
+
+  <varlistentry>
+    <term><varname>GPL</varname></term>
+    <listitem><para>GNU General Public License; version not
+    specified.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>GPLv2</varname></term>
+    <listitem><para>GNU General Public License, version
+    2.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>GPLv2+</varname></term>
+    <listitem><para>GNU General Public License, version
+    2 or higher.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>GPLv3</varname></term>
+    <listitem><para>GNU General Public License, version
+    3.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>GPLv3+</varname></term>
+    <listitem><para>GNU General Public License, version
+    3 or higher.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>bsd</varname></term>
+    <listitem><para>Catch-all for licenses that are essentially
+    similar to <link
+    xlink:href="http://www.gnu.org/licenses/license-list.html#ModifiedBSD">the
+    original BSD license with the advertising clause removed</link>,
+    i.e. permissive non-copyleft free software licenses.  This
+    includes the <link
+    xlink:href="http://www.gnu.org/licenses/license-list.html#X11License">X11
+    (“MIT”) License</link>.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>perl5</varname></term>
+    <listitem><para>The Perl 5 license (Artistic License, version 1
+    and GPL, version 1 or later).</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>free</varname></term>
+    <listitem><para>Catch-all for free software licenses not listed
+    above.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>free-copyleft</varname></term>
+    <listitem><para>Catch-all for free, copyleft software licenses not
+    listed above.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>free-non-copyleft</varname></term>
+    <listitem><para>Catch-all for free, non-copyleft software licenses
+    not listed above.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>unfree-redistributable</varname></term>
+    <listitem><para>Unfree package that can be redistributed in binary
+    form.  That is, it’s legal to redistribute the
+    <emphasis>output</emphasis> of the derivation.  This means that
+    the package can be included in the Nixpkgs
+    channel.</para>
+
+    <para>Sometimes proprietary software can only be redistributed
+    unmodified.  Make sure the builder doesn’t actually modify the
+    original binaries; otherwise we’re breaking the license.  For
+    instance, the NVIDIA X11 drivers can be redistributed unmodified,
+    but our builder applies <command>patchelf</command> to make them
+    work.  Thus, its license is <varname>unfree</varname> and it
+    cannot be included in the Nixpkgs channel.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>unfree</varname></term>
+    <listitem><para>Unfree package that cannot be redistributed.  You
+    can build it yourself, but you cannot redistribute the output of
+    the derivation.  Thus it cannot be included in the Nixpkgs
+    channel.</para></listitem>
+  </varlistentry>
+
+  <varlistentry>
+    <term><varname>unfree-redistributable-firmware</varname></term>
+    <listitem><para>This package supplies unfree, redistributable
+    firmware.  This is a separate value from
+    <varname>unfree-redistributable</varname> because not everybody
+    cares whether firmware is free.</para></listitem>
+  </varlistentry>
+
+</variablelist>
+
+</para>
+  
+
+</section>
+  
+
+</chapter>
--- a/doc/old/cross.txt
+++ b/doc/old/cross.txt
@ -60,11 +60,11 @@ stdenv.mkDerivation {
  name = "binutils-2.16.1-arm";
  builder = ./builder.sh;
  src = fetchurl {
-    url = "http://ftp.nluug.nl/gnu/binutils/binutils-2.16.1.tar.bz2";
-    sha256 = "1ian3kwh2vg6hr3ymrv48s04gijs539vzrq62xr76bxbhbwnz2np";
+    url = http://ftp.nluug.nl/gnu/binutils/binutils-2.16.1.tar.bz2;
+    md5 = "6a9d529efb285071dad10e1f3d2b2967";
  };
  inherit noSysDirs;
-  configureFlags = [ "--target=arm-linux" ];
+  configureFlags = "--target=arm-linux";
 }
 ---

@ -78,14 +78,14 @@ Step 2: build kernel headers for the target architecture
 ---
 {stdenv, fetchurl}:

-assert stdenv.buildPlatform.system == "i686-linux";
+assert stdenv.system == "i686-linux";

 stdenv.mkDerivation {
-  name = "linux-headers-2.6.13.1-arm";
+  name = "linux-headers-2.6.13.4-arm";
  builder = ./builder.sh;
  src = fetchurl {
-    url = "http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.13.1.tar.bz2";
-    sha256 = "12qxmc827fjhaz53kjy7vyrzsaqcg78amiqsb3qm20z26w705lma";
+    url = http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.13.4.tar.bz2;
+    md5 = "94768d7eef90a9d8174639b2a7d3f58d";
  };
 }
 ---
@ -152,7 +152,9 @@ stdenv.mkDerivation {
  builder = ./builder.sh;
  src = fetchurl {
    url = ftp://ftp.nluug.nl/pub/gnu/gcc/gcc-4.0.2/gcc-core-4.0.2.tar.bz2;
-    sha256 = "02fxh0asflm8825w23l2jq1wvs7hbnam0jayrivg7zdv2ifnc0rc";
+    md5 = "f7781398ada62ba255486673e6274b26";
+    #url = ftp://ftp.nluug.nl/pub/gnu/gcc/gcc-4.0.2/gcc-4.0.2.tar.bz2;
+    #md5 = "a659b8388cac9db2b13e056e574ceeb0";
  };
  # !!! apply only if noSysDirs is set
  patches = [./no-sys-dirs.patch ./gcc-inhibit.patch];
@ -182,10 +184,10 @@ if test "$noSysDirs" = "1"; then
    if test "$noSysDirs" = "1"; then
        # Figure out what extra flags to pass to the gcc compilers
        # being generated to make sure that they use our glibc.
-        if test -e $NIX_CC/nix-support/orig-glibc; then
-            glibc=$(cat $NIX_CC/nix-support/orig-glibc)
+        if test -e $NIX_GCC/nix-support/orig-glibc; then
+            glibc=$(cat $NIX_GCC/nix-support/orig-glibc)
            # Ugh.  Copied from gcc-wrapper/builder.sh.  We can't just
-            # source in $NIX_CC/nix-support/add-flags, since that
+            # source in $NIX_GCC/nix-support/add-flags, since that
            # would cause *this* GCC to be linked against the
            # *previous* GCC.  Need some more modularity there.
            extraCFlags="-B$glibc/lib -isystem $glibc/include"
--- a/doc/old/update-upstream-data.txt
+++ b/doc/old/update-upstream-data.txt
@ -0,0 +1,14 @@
+Semi-automatic source information updating using "update-upstream-data.sh" script and "src-{,info-}for-*.nix"
+
+1. Recognizing when a pre-existing package uses this mechanism.
+
+Packages using this automatical update mechanism have src-info-for-default.nix and src-for-default.nix next to default.nix. src-info-for-default.nix describes getting the freshest source from upstream web site; src-for-default.nix is a generated file with the current data about used source. Both files define a simple attrSet. 
+
+src-info-for-default.nix (for a file grabbed via http) contains at least downloadPage attribute - it is the page we need to look at to find out the latest version. It also contains baseName that is used for automatical generation of package name containing version. It can contain extra data for trickier cases.
+
+src-for-default.nix will contain advertisedUrl (raw URL chosen on the site; its change prompts regeneration of source data), url for fetchurl, hash, version retrieved from the download URL and suggested package name.
+
+2. Updating a package
+
+nixpkgs/pkgs/build-support/upstream-updater directory contains some scripts. The worker script is called update-upstream-data.sh. This script requires main expression name (e.g. default.nix). It can optionally accpet a second parameter, URL which will be used instead of getting one by parsing the downloadPage (version extraction, mirror URL creation etc. will still be run). After running the script, check src-for-default.nix (or replace default.nix with expression name, if there are seceral expressions in the directory) for new version information.
+
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Shea Levy	87c5c94179	Fix tarball	2014-04-07 10:03:45 -04:00
Shea Levy	6b5d29b507	Remove downstream dependents of oracle jdks	2014-04-07 09:50:30 -04:00
Shea Levy	d04c476246	Remove cgminer It depends on a package removed due to requireFile	2014-04-07 09:46:01 -04:00
Shea Levy	668ce7588c	Add comment about using requireFile in nixpkgs	2014-04-07 09:43:36 -04:00
Shea Levy	6a284f13d9	Remove mathematica requireFile should not be used in nixpkgs	2014-04-07 09:43:05 -04:00
Shea Levy	939da96e72	Remove virtualbox extension pack support requireFile should not be used in nixpkgs	2014-04-07 09:41:31 -04:00
Shea Levy	c2e6512709	Remove oracle jdk requireFile should not be used in nixpkgs	2014-04-07 09:37:38 -04:00
Shea Levy	ccbc46ff63	Remove wtk requireFile should not be used in nixpkgs	2014-04-07 09:35:32 -04:00
Shea Levy	e0d5b86d60	Remove amdadl-sdk requireFile should not be used in nixpkgs	2014-04-07 09:34:58 -04:00
Shea Levy	687284b645	Remove flashtool requireFile should not be used in nixpkgs	2014-04-07 09:34:08 -04:00
Shea Levy	68bac6f46b	Remove andyetitmoves requireFile should not be used in nixpkgs	2014-04-07 09:33:33 -04:00
Shea Levy	c5e7f929c7	Remove gsb requireFile should not be used in nixpkgs	2014-04-07 09:32:54 -04:00
Shea Levy	e0d0f56a54	Remove uqm requireFile should not be used in nixpkgs	2014-04-07 09:32:14 -04:00
Shea Levy	3f93672618	Remove vessel requireFile should not be used in nixpkgs	2014-04-07 09:31:24 -04:00
Shea Levy	f90e4aa16c	Remove worldofgoo requireFile should not be used in nixpkgs	2014-04-07 09:30:40 -04:00
Shea Levy	0c05b7194c	Remove oracleXE requireFile should not be used in nixpkgs	2014-04-07 09:29:51 -04:00
Shea Levy	c95ceede13	Remove megacli requireFile should not be used in nixpkgs	2014-04-07 09:28:52 -04:00
 @ -1 +1 @@
 .09
 .04