Fix the tests and the one bug that it highlighted.

data/model.py

@@ -13,7 +13,7 @@ from util.names import format_robot_username
 
 logger = logging.getLogger(__name__)
 store = app.config['STORAGE']
-
+transaction_factory = app.config['DB_TRANSACTION_FACTORY']
 
 class DataModelException(Exception):
   pass
@@ -580,6 +580,9 @@ def _visible_repository_query(username=None, include_public=True, limit=None,
 
 def _filter_to_repos_for_user(query, username=None, namespace=None,
                               include_public=True):
+  if not include_public and not username:
+    return Repository.select().where(Repository.id == '-1')
+
   where_clause = None
   if username:
     UserThroughTeam = User.alias()
@@ -872,7 +875,7 @@ def create_repository(namespace, name, creating_user, visibility='private'):
 
 
 def create_or_link_image(docker_image_id, repository, username, create=True):
-  with db.transaction():
+  with transaction_factory(db):
     query = (ImageStorage
       .select()
       .distinct()
@@ -934,7 +937,7 @@ def set_image_size(docker_image_id, namespace_name, repository_name,
 
 def set_image_metadata(docker_image_id, namespace_name, repository_name,
                        created_date_str, comment, command, parent=None):
-  with db.transaction():
+  with transaction_factory(db):
     query = (Image
       .select(Image, ImageStorage)
       .join(Repository)
@@ -980,7 +983,7 @@ def list_repository_tags(namespace_name, repository_name):
 
 
 def garbage_collect_repository(namespace_name, repository_name):
-  with db.transaction():
+  with transaction_factory(db):
     # Get a list of all images used by tags in the repository
     tag_query = (RepositoryTag
       .select(RepositoryTag, Image, ImageStorage)
@@ -1032,7 +1035,7 @@ def garbage_collect_repository(namespace_name, repository_name):
                                     storage.uuid)      
       store.remove(image_path)
 
-  return len(to_remove)
+    return len(to_remove)
 
 
 def get_tag_image(namespace_name, repository_name, tag_name):