Support Travis CI containers. Fixes #5.

Change install-racket.sh to:

- Use a RACKET_DIR env var saying where to install Racket. For backwards
  compatibility, if undefined this defaults to /usr/racket.

- Don't use sudo unless installing to /usr*.

- Download nightly snapshot builds from Northwestern not Utah.
  See https://github.com/travis-ci/travis-ci/issues/3012

- Fix the here string (which was slightly broken all along, although in
  a way that had been harmless).

Change the example .travis.yml to:

- Split env into global and matrix sections.

- Specify RACKET_DIR as a global var.

- Specify the RACKET_VERSIONs as matrix vars.

- Set PATH from RACKET_DIR (because install-racket.sh can't do this --
  it can't change the env for the .travis.yml).

.travis.yml

@@ -1,44 +1,57 @@
 language: c
 
-# Supply at least one RACKET_VERSION environment variable definition
-# here. RACKET_VERSION is used by the install-racket.sh script
-# (specifed below under before_install) to select the version of
-# Racket to download and install.
+# Optional: To use Travis CI's newer container infrastucture,
+# un-comment the following line. (Also be sure RACKET_DIR is set to
+# somewhere like ~/racket that doesn't require sudo.)
 #
-# If you supply more than one, you can create multiple builds (a
-# Travis-CI build matrix resulting in multiple builds). You can use
-# this to test against multiple Racket versions.
+# sudo: false
+
 env:
- - RACKET_VERSION=5.3.4
- - RACKET_VERSION=5.3.5
- - RACKET_VERSION=5.92
- - RACKET_VERSION=6.0
- - RACKET_VERSION=6.1
- - RACKET_VERSION=6.1.1
- - RACKET_VERSION=HEAD
+  global:
+    # Supply a global RACKET_DIR environment variable. This is where
+    # Racket will be installed. A good idea is to use ~/racket because
+    # that doesn't require sudo to install and is therefore compatible
+    # with Travis CI's newer container infrastructure.
+    - RACKET_DIR=~/racket
+  matrix:
+    # Supply at least one RACKET_VERSION environment variable. This is
+    # used by the install-racket.sh script (run at before_install,
+    # below) to select the version of Racket to download and install.
+    #
+    # Supply more than one RACKET_VERSION (as in the example below) to
+    # create a Travis-CI build matrix to test against multiple Racket
+    # versions.
+    - RACKET_VERSION=5.3.4
+    - RACKET_VERSION=5.3.5
+    - RACKET_VERSION=5.92
+    - RACKET_VERSION=6.0
+    - RACKET_VERSION=6.1
+    - RACKET_VERSION=6.1.1
+    - RACKET_VERSION=HEAD
 
 before_install:
-- git clone https://github.com/greghendershott/travis-racket.git
-- cat travis-racket/install-racket.sh | bash # pipe to bash not sh!
+  - git clone https://github.com/greghendershott/travis-racket.git
+  - cat travis-racket/install-racket.sh | bash # pipe to bash not sh!
+  - export PATH="${RACKET_DIR}/bin:${PATH}" #install-racket.sh can't set for us
 
 install:
 
 before_script:
 
-# Here supply steps such as raco make, raco test, etc.  Note that you
-# need to supply /usr/racket/bin/ -- it's not in PATH. You can run
-# `raco pkg install --deps search-auto <pkg>` to install any required
-# packages without it getting stuck on a confirmation prompt.
+# Here supply steps such as raco make, raco test, etc.
+#
+# Tip: Use `raco pkg install --deps search-auto <pkg>` to install any
+# required packages without getting stuck on a confirmation prompt.
 script:
- - /usr/racket/bin/raco make main.rkt
- - /usr/racket/bin/raco test -x .
+  - raco make main.rkt
+  - raco test -x .
 
 # NOTE: If your repo is a Racket package with an info.rkt that
 # includes some `deps`, the following is more elegant:
 #
 # script:
 # - cd ..   # Travis did a cd into the dir. Back up, for the next:
-# - /usr/racket/bin/raco pkg install --deps search-auto --link <pkg>
-# - /usr/racket/bin/raco test -x -p <pkg>
+# - raco pkg install --deps search-auto --link <pkg>
+# - raco test -x -p <pkg>
 
 after_script:

install-racket.sh

@@ -4,7 +4,7 @@
 set -e
 
 if [[ "$RACKET_VERSION" = "HEAD" ]]; then
-    URL="http://www.cs.utah.edu/plt/snapshots/current/installers/racket-current-x86_64-linux-precise.sh"
+    URL="http://plt.eecs.northwestern.edu/snapshots/current/installers/racket-test-current-x86_64-linux-precise.sh"
 elif [[ "$RACKET_VERSION" = 5.9* ]]; then
     URL="http://download.racket-lang.org/installers/${RACKET_VERSION}/racket-${RACKET_VERSION}-x86_64-linux-ubuntu-quantal.sh"
 elif [[ "$RACKET_VERSION" = 6.* ]]; then
@@ -13,17 +13,33 @@ else
     URL="http://download.racket-lang.org/installers/${RACKET_VERSION}/racket/racket-${RACKET_VERSION}-bin-x86_64-linux-debian-squeeze.sh"
 fi
 
-INSTALL="./racket-${RACKET_VERSION}.sh"
+# Older .travis.yml files don't set $RACKET_DIR (the Racket install
+# directory) explicitly and expect it to be /usr/racket.
+if [[ "$RACKET_DIR" = "" ]]; then
+    RACKET_DIR=/usr/racket
+fi
 
-echo "Downloading $URL to $INSTALL:"
-curl -L -o $INSTALL $URL
+INSTALLER="./racket-${RACKET_VERSION}.sh"
 
-echo "Running $INSTALL to install Racket:"
-chmod u+rx "$INSTALL"
-sudo "$INSTALL" <<EOF
+echo "Downloading $URL to $INSTALLER:"
+curl -L -o $INSTALLER $URL
+
+echo "Making $INSTALLER executable:"
+chmod u+rx "$INSTALLER"
+
+# Only use sudo if installing to /usr
+if [[ "$RACKET_DIR" = /usr* ]]; then
+    RUN_INSTALLER="sudo ${INSTALLER}"
+else
+    RUN_INSTALLER="${INSTALLER}"
+fi
+
+echo "Running $RUN_INSTALLER to install Racket:"
+
+$RUN_INSTALLER <<EOF
 no
-/usr/racket
+"$RACKET_DIR"
 
-# EOF
+EOF
 
 exit 0