Add support for skipping Dockerfile builds via the [skip build] or [build skip] message

endpoints/trigger.py

@@ -20,6 +20,10 @@ TARBALL_MIME = 'application/gzip'
 CHUNK_SIZE = 512 * 1024
 
 
+def should_skip_commit(message):
+  return '[skip build]' in message or '[build skip]' in message
+
+
 class BuildArchiveException(Exception):
   pass
 
@@ -35,6 +39,9 @@ class TriggerDeactivationException(Exception):
 class ValidationRequestException(Exception):
   pass
 
+class SkipRequestException(Exception):
+  pass
+
 class EmptyRepositoryException(Exception):
   pass
 
@@ -308,13 +315,20 @@ class GithubBuildTrigger(BuildTrigger):
 
   def handle_trigger_request(self, request, auth_token, config):
     payload = request.get_json()
-
+    if not payload:
+      raise SkipRequestException()      
+    
     if 'zen' in payload:
       raise ValidationRequestException()
 
     logger.debug('Payload %s', payload)
     ref = payload['ref']
     commit_sha = payload['head_commit']['id']
+    commit_message = payload['head_commit'].get('message', '')
+
+    if should_skip_commit(commit_message):
+      raise SkipRequestException() 
+
     short_sha = GithubBuildTrigger.get_display_name(commit_sha)
 
     gh_client = self._get_client(auth_token)