diff --git a/all.nix b/all.nix
index a4ef81b..d0b62ea 100644
--- a/all.nix
+++ b/all.nix
@@ -1,4 +1,16 @@
-import ./default.nix {
- nvidiaVersion = "440.82";
- nvidiaHash = "edd415acf2f75a659e0f3b4f27c1fab770cf21614e84a18152d94f0d004a758e";
+let
+ pkgs = import <nixpkgs> { config = { allowUnfree = true; }; };
+in
+{
+ pure = pkgs.recurseIntoAttrs (pkgs.callPackage ./nixGL.nix {
+ nvidiaVersion = "440.82";
+ nvidiaHash = "edd415acf2f75a659e0f3b4f27c1fab770cf21614e84a18152d94f0d004a758e";
+ });
+
+ versionFile = pkgs.recurseIntoAttrs (pkgs.callPackage ./nixGL.nix {
+ nvidiaVersionFile = pkgs.writeText "nvidia-version-440.82" ''
+ NVRM version: NVIDIA UNIX x86_64 Kernel Module 440.82 Wed Apr 1 20:04:33 UTC 2020
+ GCC version: gcc version 9.3.0 (Arch Linux 9.3.0-1)
+ '';
+ });
}
diff --git a/default.nix b/default.nix
index 7455b30..c73ae7c 100644
--- a/default.nix
+++ b/default.nix
@@ -4,6 +4,11 @@
# Hash of the Nvidia driver .run file. null is fine, but fixing a value here
# will be more reproducible and more efficient.
nvidiaHash ? null,
+ # Alternatively, you can pass a path that points to a nvidia version file
+ # and let nixGL extract the version from it. That file must be a copy of
+ # /proc/driver/nvidia/version. Nix doesn't like zero-sized files (see
+ # https://github.com/NixOS/nix/issues/3539 ).
+ nvidiaVersionFile ? null,
# Enable 32 bits driver
# This is one by default, you can switch it to off if you want to reduce a
# bit the size of nixGL closure.
@@ -15,5 +20,10 @@
}
}:
pkgs.callPackage ./nixGL.nix {
- inherit nvidiaVersion nvidiaHash enable32bits;
+ inherit
+ nvidiaVersion
+ nvidiaVersionFile
+ nvidiaHash
+ enable32bits
+ ;
}
diff --git a/nixGL.nix b/nixGL.nix
index 8f70d36..224fd9d 100644
--- a/nixGL.nix
+++ b/nixGL.nix
@@ -4,6 +4,11 @@
# Hash of the Nvidia driver .run file. null is fine, but fixing a value here
# will be more reproducible and more efficient.
nvidiaHash ? null,
+ # Alternatively, you can pass a path that points to a nvidia version file
+ # and let nixGL extract the version from it. That file must be a copy of
+ # /proc/driver/nvidia/version. Nix doesn't like zero-sized files (see
+ # https://github.com/NixOS/nix/issues/3539 ).
+ nvidiaVersionFile ? null,
# Enable 32 bits driver
# This is one by default, you can switch it to off if you want to reduce a
# bit the size of nixGL closure.
@@ -14,50 +19,59 @@
}:
let
+ _nvidiaVersionFile =
+ if nvidiaVersionFile != null then
+ nvidiaVersionFile
+ else
+ # HACK: Get the version from /proc. It turns out that /proc is mounted
+ # inside of the build sandbox and varies from machine to machine.
+ #
+ # builtins.readFile is not able to read /proc files. See
+ # https://github.com/NixOS/nix/issues/3539.
+ runCommand "impure-nvidia-version-file" {
+ # To avoid sharing the build result over time or between machine,
+ # Add an impure parameter to force the rebuild on each access.
+ time = builtins.currentTime;
+ }
+ "cp /proc/driver/nvidia/version $out || touch $out";
+
# The nvidia version. Either fixed by the `nvidiaVersion` argument, or
- # auto-detected.
- _nvidiaVersion = if nvidiaVersion != null
- then nvidiaVersion
- else
- # This is the auto-detection mecanism. This is ugly.
- # We read /proc/driver/nvidia/version which is set by the Nvidia driver kernel module.
- # This fails if the nvidia driver kernel module is not loaded.
- # I'd like to just read the file using `${/proc/driver/nvidia/version}` and
- # then let nix invalidate the derivation if the content of this file
- # changes, but that's not possible, see
- # https://github.com/NixOS/nix/issues/3539
- # But /proc is readable at build time! So runCommand works fine.
- import (runCommand "auto-detect-nvidia" {
- time = builtins.currentTime;
- }
- ''
- # Written this way so if the version file does not exists, the script crashs
- VERSION="$(${pcre}/bin/pcregrep -o1 'Module +([0-9]+\.[0-9]+)' /proc/driver/nvidia/version)"
- echo "\"$VERSION\"" > $out
- '');
+ # auto-detected. Auto-detection is impure.
+ _nvidiaVersion =
+ if nvidiaVersion != null then
+ nvidiaVersion
+ else
+ # Get if from the nvidiaVersionFile
+ let
+ data = builtins.readFile _nvidiaVersionFile;
+ versionMatch = builtins.match ".*Module +([0-9]+\\.[0-9]+).*" data;
+ in
+ if versionMatch != null then
+ builtins.head versionMatch
+ else
+ null;
- addNvidiaVersion = drv: drv.overrideAttrs(oldAttrs: {
- name = oldAttrs.name + "-${_nvidiaVersion}";
- });
+ addNvidiaVersion = drv: drv.overrideAttrs(oldAttrs: {
+ name = oldAttrs.name + "-${_nvidiaVersion}";
+ });
- writeExecutable = { name, text } : writeTextFile {
- inherit name text;
+ writeExecutable = { name, text } : writeTextFile {
+ inherit name text;
- executable = true;
- destination = "/bin/${name}";
+ executable = true;
+ destination = "/bin/${name}";
- checkPhase = ''
- ${shellcheck}/bin/shellcheck "$out/bin/${name}"
-
- # Check that all the files listed in the output binary exists
- for i in $(${pcre}/bin/pcregrep -o0 '/nix/store/.*?/[^ ":]+' $out/bin/${name})
- do
- ls $i > /dev/null || (echo "File $i, referenced in $out/bin/${name} does not exists."; exit -1)
- done
- '';
- };
+ checkPhase = ''
+ ${shellcheck}/bin/shellcheck "$out/bin/${name}"
+ # Check that all the files listed in the output binary exists
+ for i in $(${pcre}/bin/pcregrep -o0 '/nix/store/.*?/[^ ":]+' $out/bin/${name})
+ do
+ ls $i > /dev/null || (echo "File $i, referenced in $out/bin/${name} does not exists."; exit -1)
+ done
+ '';
+ };
in
rec {
nvidia = (linuxPackages.nvidia_x11.override {
@@ -175,8 +189,9 @@ in
# The output derivation contains nixGL which point either to
# nixGLNvidia or nixGLIntel using an heuristic.
nixGLDefault =
- if builtins.pathExists "/proc/driver/nvidia/version"
- then nixGLCommon nixGLNvidia
- else nixGLCommon nixGLIntel;
-
- }
+ if _nvidiaVersion != null then
+ nixGLCommon nixGLNvidia
+ else
+ nixGLCommon nixGLIntel
+ ;
+}