From d4db7a44c1f95a8bc7d5a1c4841ecc7e6ec2c66d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Georges=20Dup=C3=A9ron?= <georges.duperon@gmail.com>
Date: Fri, 15 Jan 2016 17:00:18 +0100
Subject: [PATCH] Added caching to .travis.yml, for the racket installer.

---
 .travis.yml | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index f16c0814..2cf10c95 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,8 +11,16 @@ env:
 - PATH=~/racket/bin:$PATH
 
 before_install:
-- curl -L -o installer.sh http://www.cs.utah.edu/plt/snapshots/current/installers/racket-current-x86_64-linux-precise.sh
-- sh installer.sh --in-place --dest ~/racket/
+- racket_commit=fail
+- racket_commit=$(curl http://www.cs.utah.edu/plt/snapshots/current/ | tr "\n" " " | sed -e 's/[  ][      ]*/ /g' | sed -e 's/^.*<span class="checksum"> *//' | sed -e 's| *</span>.*$||')
+- if test ${#racket_commit} -ne 40 || echo $racket_commit | grep [^0-9a-f]; then racket_commit=fail; fi
+- if test -e $HOME/cache/racket_commit -a "${racket_commit}" = "$(cat $HOME/cache/racket_commit)"; then echo "Using cached version of racket installer, commit ${racket_commit} == $(cat $HOME/cache/racket_commit)."; else test -e $HOME/cache && rm -fr $HOME/cache; mkdir -p $HOME/cache; echo $racket_commit > $HOME/cache/racket_commit; curl -L -o $HOME/cache/installer.sh http://www.cs.utah.edu/plt/snapshots/current/installers/racket-current-x86_64-linux-precise.sh; fi
+- sh $HOME/cache/installer.sh --in-place --dest ~/racket/
+
+cache:
+  apt: true
+  directories:
+  - $HOME/cache
 
 install:
 - cd graph-lib