Devserver: allow SubversionFileSystem to be pinned to a specific rev on construction

chrome/common/extensions/docs/server2/object_store_creator.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from appengine_wrappers import GetAppVersion
 from cache_chain_object_store import CacheChainObjectStore
 from memcache_object_store import MemcacheObjectStore
 from test_object_store import TestObjectStore
 from persistent_object_store import PersistentObjectStore
 
 _unspecified = object()
 
 class ObjectStoreCreator(object):
   '''Creates ObjectStores with a namespacing and behaviour configuration.
 
   The initial configuration is specified on object store construction. When
   creating ObjectStores via Create this configuration can be overridden (or
   via the variants of Create which do this automatically).
   '''
   def __init__(self,
                channel,
+               # TODO(kalman): rename start_dirty?
                start_empty=_unspecified,
                # Override for testing. A custom ObjectStore type to construct
                # on Create(). Useful with TestObjectStore, for example.
                store_type=None,
                # Override for testing. Whether the ObjectStore type specified
                # with |store_type| should be wrapped e.g. with Caching. This is
                # useful to override when specific state tests/manipulations are
                # being done on the underlying object store.
                disable_wrappers=False):
     self._channel = channel
@@ skipping 45 matching lines @@
         if value is not None)
 
     if self._disable_wrappers:
       return self._store_type(namespace, start_empty=start_empty)
 
     if self._store_type is not None:
       chain = (self._store_type(namespace),)
     else:
       chain = (MemcacheObjectStore(namespace), PersistentObjectStore(namespace))
     return CacheChainObjectStore(chain, start_empty=start_empty)