build,travis: test commits format

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

.travis.yml

@@ -11,4 +11,5 @@ before_script:
   - ./.travis_do.sh download_sdk
 
 script:
+  - ./.travis_do.sh test_commits
   - ./.travis_do.sh test_packages

.travis_do.sh

@@ -104,6 +104,44 @@ EOF
 	exit $RET
 }
 
+test_commits() {
+	RET=0
+	for commit in $(git rev-list ${TRAVIS_COMMIT_RANGE/.../..}); do
+		echo_blue "=== Checking commit '$commit'"
+		if git show --format='%P' -s $commit | grep -qF ' '; then
+			echo_red "Pull request should not include merge commits"
+			RET=1
+		fi
+
+		author="$(git show -s --format=%aN $commit)"
+		if echo $author | grep -q '\S\+\s\+\S\+'; then
+			echo_green "Author name ($author) seems ok"
+		else
+			echo_red "Author name ($author) need to be your real name 'firstname lastname'"
+			RET=1
+		fi
+
+		subject="$(git show -s --format=%s $commit)"
+		if echo "$subject" | grep -q '^[0-9A-Za-z,]\+: '; then
+			echo_green "Commit subject line seems ok ($subject)"
+		else
+			echo_red "Commit subject line MUST start with '<package name>: ' ($subject)"
+			RET=1
+		fi
+
+		body="$(git show -s --format=%b $commit)"
+		sob="$(git show -s --format='Signed-off-by: %aN <%aE>' $commit)"
+		if echo "$body" | grep -qF "$sob"; then
+			echo_green "Signed-off-by match author"
+		else
+			echo_red "Signed-off-by is missing or doesn't match author (should be '$sob')"
+			RET=1
+		fi
+	done
+
+	exit $RET
+}
+
 echo_blue "=== Travis ENV"
 env
 echo_blue "=== Travis ENV"