Make sure builds are queued under a transaction. This should prevent a queue item from existing without its repository build object (or vice versa).

endpoints/common.py

@@ -10,6 +10,7 @@ from flask.ext.principal import identity_changed
 from random import SystemRandom
 
 from data import model
+from data.database import db
 from app import app, login_manager, dockerfile_build_queue, notification_queue
 from auth.permissions import QuayDeferredPermissionUser
 from auth import scopes
@@ -222,6 +223,7 @@ def start_build(repository, dockerfile_id, tags, build_name, subdir, manual,
     'build_subdir': subdir
   }
 
+  with app.config['DB_TRANSACTION_FACTORY'](db):
     build_request = model.create_repository_build(repository, token, job_config,
                                                   dockerfile_id, build_name,
                                                   trigger, pull_robot_name=pull_robot_name)