travis: add coverity scan integration

R=ted.mielczarek@gmail.com

Review URL: https://codereview.chromium.org/2078283002 .

scripts/travis-build.sh

@@ -19,6 +19,26 @@ setup_env() {
   export JOBS=$(( $NCPUS < 4 ? $NCPUS : 4 ))
 }
 
+# We have to do this by hand rather than use the coverity addon because of
+# matrix explosion: https://github.com/travis-ci/travis-ci/issues/1975
+coverity_scan() {
+  if [ "${TRAVIS_JOB_NUMBER##*.}" != "1" ] || \
+     [ -n "${TRAVIS_TAG}" ] || \
+     [ "${TRAVIS_PULL_REQUEST}" = "true" ]
+  then
+    echo "Skipping coverity scan."
+    return
+  fi
+
+  export COVERITY_SCAN_PROJECT_NAME="${TRAVIS_REPO_SLUG}"
+  export COVERITY_SCAN_NOTIFICATION_EMAIL="google-breakpad-dev@googlegroups.com"
+  export COVERITY_SCAN_BUILD_COMMAND="build"
+  export COVERITY_SCAN_BUILD_COMMAND_PREPEND="git clean -q -x -d -f; git checkout -f"
+  export COVERITY_SCAN_BRANCH_PATTERN="master"
+
+  curl -s "https://scan.coverity.com/scripts/travisci_build_coverity_scan.sh" | bash || :
+}
+
 # Do an in-tree build and make sure tests pass.
 build() {
   ./configure
@@ -38,6 +58,10 @@ main() {
   setup_env
   build
   build_out_of_tree
+
+  # Do scans last as they like to dirty the tree and some tests
+  # expect a clean tree (like code style checks).
+  coverity_scan
 }
 
 main "$@"