travis: add a test regarding commit messages

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>

test/test-commit-message.sh

@@ -0,0 +1,53 @@
+#!/bin/bash -e
+
+travis_regex='^[a-z0-9]\(\(, \)\|[a-z0-9]\)\+[a-z0-9]: '
+
+# Testing the regex itself.
+
+# Correct patterns.
+[[ $(echo "foo, bar: bar" | grep -c "$travis_regex") -eq 1 ]]
+[[ $(echo "foo: bar" | grep -c "$travis_regex") -eq 1 ]]
+[[ $(echo "f1oo, b2ar: bar" | grep -c "$travis_regex") -eq 1 ]]
+[[ $(echo "2foo: bar" | grep -c "$travis_regex") -eq 1 ]]
+
+# Space required after :
+[[ $(echo "foo:bar" | grep -c "$travis_regex") -eq 0 ]]
+
+# First char must be a a-z0-9
+[[ $(echo ", bar: bar" | grep -c "$travis_regex") -eq 0 ]]
+
+# Last chat before : must be a a-z0-9
+[[ $(echo "foo, : bar" | grep -c "$travis_regex") -eq 0 ]]
+
+# Last chat before : must be a a-z0-9
+[[ $(echo "foo,: bar" | grep -c "$travis_regex") -eq 0 ]]
+
+# No caps
+[[ $(echo "Foo: bar" | grep -c "$travis_regex") -eq 0 ]]
+
+# More than one char is required before :
+[[ $(echo "a: bar" | grep -c "$travis_regex") -eq 0 ]]
+
+test_commit_message() {
+	echo Testing commit message $1
+	if ! git log --format=%s $1 | head -n 1 | grep -q "$travis_regex"
+	then
+		echo "Commit message should follow the following regex: '$travis_regex'"
+		echo
+		echo "e.g:"
+		echo "prometheus: implement rest api"
+		echo "resources: svc: fix a race condition with reloads"
+		exit 1
+	fi
+}
+
+if [[ -n "$TRAVIS_PULL_REQUEST_SHA" ]]
+then
+	commits=$(git log --format=%H origin/${TRAVIS_BRANCH}..${TRAVIS_PULL_REQUEST_SHA})
+	[[ -n "$commits" ]]
+
+	for commit in $commits
+	do
+		test_commit_message $commit
+	done
+fi