Get PR URL and Branch using GitHub API

.travis.yml

@@ -9,7 +9,7 @@ env:
     - OMF_REPO_BRANCH="$TRAVIS_BRANCH"
 
 before_install:
-  - export OMF_REPO_BRANCH=`tools/branch-name.sh`
+  - source tools/travis-github-pr-integration.sh
   - docker build -t fish . < Dockerfile
 
 before_script:

tools/branch-name.sh

@@ -1,16 +0,0 @@
-#!/usr/bin/env sh
-
-URL=https://api.github.com/repos/$TRAVIS_REPO_SLUG/pulls/$TRAVIS_PULL_REQUEST
-
-BRANCH_NAME=`curl -s $URL ^/dev/null \
-    | grep -C 2 "head" \
-    | grep \"ref\" \
-    | cut -d':' -f2- \
-    | sed -e 's/["|,]//g;s/^[ \t]//g'
-  `
-
-if [ -n "$BRANCH_NAME" ]; then
-  echo $BRANCH_NAME
-else
-  echo $TRAVIS_BRANCH
-fi

tools/travis-github-pr-integration.sh

@@ -0,0 +1,13 @@
+# Return if we are not in a Pull Request
+[[ "$TRAVIS_PULL_REQUEST" = "false" ]] && return
+
+GITHUB_PR_URL=https://api.github.com/repos/$TRAVIS_REPO_SLUG/pulls/$TRAVIS_PULL_REQUEST
+GITHUB_PR_BODY=$(curl -s $GITHUB_PR_URL 2>/dev/null)
+
+if [[ $GITHUB_PR_BODY =~ \"ref\":\ *\"([a-zA-Z0-9_-]*)\" ]]; then
+  export OMF_REPO_BRANCH=${BASH_REMATCH[1]}
+fi
+
+if [[ $GITHUB_PR_BODY =~ \"repo\":.*\"clone_url\":\ *\"(https://github\.com/[a-zA-Z0-9_-]*/[a-zA-Z0-9_-]*\.git).*\"base\" ]]; then
+  export OMF_REPO_URI=${BASH_REMATCH[1]}
+fi