Add automatic storage replication

Adds a worker to automatically replicate data between storages and update the database accordingly

storage/local.py

@@ -112,11 +112,9 @@ class LocalStorage(BaseStorageV2):
         sha_hash.update(buf)
     return sha_hash.hexdigest()[:7]
 
-
   def _rel_upload_path(self, uuid):
     return 'uploads/{0}'.format(uuid)
 
-
   def initiate_chunked_upload(self):
     new_uuid = str(uuid4())
 
@@ -162,3 +160,7 @@ class LocalStorage(BaseStorageV2):
     raise Exception('Storage path %s is not under a mounted volume.\n\n'
                     'Registry data must be stored under a mounted volume '
                     'to prevent data loss' % self._root_path)
+
+  def copy_to(self, destination, path):
+    with self.stream_read_file(path) as fp:
+      destination.stream_write(path, fp)