fail fast on Travis for multiple queued builds in same PR

Adjust installation of jq on osx

--only-dependencies is not what I want there

Rearrange travis steps

before_install steps are fatal by default, script steps are not
(travis runs all of them and marks the build as failed if any returns nonzero exit code)

Fail faster on osx

May as well do check-whitespace before installing deps

Add fast fail for branch builds too

Make sure branch section does not apply to PRs

.travis.yml

@@ -21,7 +21,10 @@ notifications:
           - http://status.julialang.org/put/travis
           - http://julia.mit.edu:8000/travis-hook
 before_install:
+    - make check-whitespace
     - if [ `uname` = "Linux" ]; then
+        sudo apt-get install jq -y;
+        contrib/travis_fastfail.sh || exit 1;
         BUILDOPTS="-j3 USEGCC=1 LLVM_CONFIG=llvm-config-3.3 VERBOSE=1 USE_BLAS64=0 FORCE_ASSERTIONS=1 STAGE2_DEPS=utf8proc";
         for lib in LLVM SUITESPARSE ARPACK BLAS FFTW LAPACK GMP MPFR LIBUNWIND OPENLIBM; do
             export BUILDOPTS="$BUILDOPTS USE_SYSTEM_$lib=1";
@@ -39,6 +42,8 @@ before_install:
         brew tap staticfloat/julia;
         brew rm --force $(brew deps --HEAD julia);
         brew update;
+        brew install -v jq;
+        contrib/travis_fastfail.sh || exit 1;
         brew install -v --only-dependencies --HEAD julia;
         BUILDOPTS="-j3 USECLANG=1 LLVM_CONFIG=$(brew --prefix llvm33-julia)/bin/llvm-config-3.3 VERBOSE=1 USE_BLAS64=0 SUITESPARSE_INC=-I$(brew --prefix suite-sparse-julia)/include FORCE_ASSERTIONS=1 STAGE2_DEPS=utf8proc";
         BUILDOPTS="$BUILDOPTS LIBBLAS=-lopenblas LIBBLASNAME=libopenblas LIBLAPACK=-lopenblas LIBLAPACKNAME=libopenblas";
@@ -49,10 +54,9 @@ before_install:
         export DYLD_FALLBACK_LIBRARY_PATH="/usr/local/lib:/lib:/usr/lib:$(brew --prefix openblas-julia)/lib:$(brew --prefix suite-sparse-julia)/lib:$(brew --prefix arpack-julia)/lib";
         make $BUILDOPTS -C contrib -f repackage_system_suitesparse4.make;
       fi
-    - git clone -q git://git.kitenet.net/moreutils
 script:
-    - make check-whitespace || exit 1
     - make $BUILDOPTS -C base version_git.jl.phony
+    - git clone -q git://git.kitenet.net/moreutils
     - make $BUILDOPTS NO_GIT=1 JULIA_SYSIMG_BUILD_FLAGS="--output-ji ../usr/lib/julia/sys.ji" prefix=/tmp/julia install | moreutils/ts -s "%.s"
     - if [ `uname` = "Darwin" ]; then
         for name in suitesparseconfig spqr umfpack colamd cholmod amd suitesparse_wrapper; do

contrib/travis_fastfail.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+curlhdr="Accept: application/vnd.travis-ci.2+json"
+endpoint="https://api.travis-ci.org/repos/$TRAVIS_REPO_SLUG"
+
+# Fail fast for superseded builds to PR's
+if ! [ "$TRAVIS_PULL_REQUEST" = "false" ]; then
+  if ! [ \"$TRAVIS_BUILD_NUMBER\" = $(curl -H "$curlhdr" $endpoint/builds?event_type=pull_request | \
+      jq ".builds | map(select(.pull_request_number == $TRAVIS_PULL_REQUEST))[0].number") ]; then
+    echo "There are newer queued builds for this pull request, failing early."
+    exit 1
+  fi
+else
+  # And for non-latest push builds in branches other than master or release*
+  case $TRAVIS_BRANCH in
+    master | release*)
+      ;;
+    *)
+      if ! [ \"$TRAVIS_BUILD_NUMBER\" = $(curl -H "$curlhdr" \
+          $endpoint/branches/$TRAVIS_BRANCH | jq ".branch.number") ]; then
+        echo "There are newer queued builds for this branch, failing early."
+        exit 1
+      fi
+      ;;
+  esac
+fi