Merge branch 'ls/travis-yaml'

The necessary infrastructure to build topics using the free Travis
CI has been added. Developers forking from this topic (and enabling
Travis) can do their own builds, and we can turn on auto-builds for
git/git (including build-status for pull requests that people
open).

* ls/travis-yaml:
  Add Travis CI support

Author: gitster

.travis.yml

@@ -0,0 +1,91 @@
+language: c
+
+os:
+  - linux
+  - osx
+
+compiler:
+  - clang
+  - gcc
+
+addons:
+  apt:
+    packages:
+    - language-pack-is
+
+env:
+  global:
+    - P4_VERSION="15.2"
+    - GIT_LFS_VERSION="1.1.0"
+    - DEFAULT_TEST_TARGET=prove
+    - GIT_PROVE_OPTS="--timer --jobs 3"
+    - GIT_TEST_OPTS="--verbose --tee"
+    - CFLAGS="-g -O2 -Wall -Werror"
+    - GIT_TEST_CLONE_2GB=YesPlease
+    # t9810 occasionally fails on Travis CI OS X
+    # t9816 occasionally fails with "TAP out of sequence errors" on Travis CI OS X
+    - GIT_SKIP_TESTS="t9810 t9816"
+
+before_install:
+  - >
+    case "${TRAVIS_OS_NAME:-linux}" in
+    linux)
+      mkdir --parents custom/p4
+      pushd custom/p4
+        wget --quiet http://filehost.perforce.com/perforce/r$P4_VERSION/bin.linux26x86_64/p4d
+        wget --quiet http://filehost.perforce.com/perforce/r$P4_VERSION/bin.linux26x86_64/p4
+        chmod u+x p4d
+        chmod u+x p4
+        export PATH="$(pwd):$PATH"
+      popd
+      mkdir --parents custom/git-lfs
+      pushd custom/git-lfs
+        wget --quiet https://github.com/github/git-lfs/releases/download/v$GIT_LFS_VERSION/git-lfs-linux-amd64-$GIT_LFS_VERSION.tar.gz
+        tar --extract --gunzip --file "git-lfs-linux-amd64-$GIT_LFS_VERSION.tar.gz"
+        cp git-lfs-$GIT_LFS_VERSION/git-lfs .
+        export PATH="$(pwd):$PATH"
+      popd
+      ;;
+    osx)
+      brew_force_set_latest_binary_hash () {
+        FORMULA=$1
+        SHA=$(brew fetch --force $FORMULA 2>&1 | grep ^SHA256: | cut -d ' ' -f 2)
+        sed -E -i.bak "s/sha256 \"[0-9a-f]{64}\"/sha256 \"$SHA\"/g" \
+          /usr/local/Library/Taps/homebrew/homebrew-binary/$FORMULA.rb
+      }
+      brew update --quiet
+      brew tap homebrew/binary --quiet
+      brew_force_set_latest_binary_hash perforce
+      brew_force_set_latest_binary_hash perforce-server
+      brew install git-lfs perforce-server perforce gettext
+      brew link --force gettext
+      ;;
+    esac;
+    echo "$(tput setaf 6)Perforce Server Version$(tput sgr0)";
+    p4d -V | grep Rev.;
+    echo "$(tput setaf 6)Perforce Client Version$(tput sgr0)";
+    p4 -V | grep Rev.;
+    echo "$(tput setaf 6)Git-LFS Version$(tput sgr0)";
+    git-lfs version;
+
+before_script: make --jobs=2
+
+script: make --quiet test
+
+after_failure:
+  - >
+    : '<-- Click here to see detailed test output!                                                        ';
+    for TEST_EXIT in t/test-results/*.exit;
+    do
+      if [ "$(cat "$TEST_EXIT")" != "0" ];
+      then
+        TEST_OUT="${TEST_EXIT%exit}out";
+        echo "------------------------------------------------------------------------";
+        echo "$(tput setaf 1)${TEST_OUT}...$(tput sgr0)";
+        echo "------------------------------------------------------------------------";
+        cat "${TEST_OUT}";
+      fi;
+    done;
+
+notifications:
+  email: false