Add git subtree daemon service.

infra/libs/git2/repo.py

 # Copyright 2014 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.
 
 import collections
 import errno
 import fnmatch
 import logging
 import os
 import subprocess
@@ skipping 18 matching lines @@
 
   def __init__(self, url):
     self.dry_run = False
     self.repos_dir = None
 
     self._url = url
     self._repo_path = None
     self._commit_cache = collections.OrderedDict()
     self._log = LOGGER.getChild('Repo')
 
+  def __hash__(self):
+    return hash((self._url, self._repo_path))
+
   def __getitem__(self, ref):
     """Get a Ref attached to this Repo."""
     return Ref(self, ref)
 
   # Accessors
   # pylint: disable=W0212
   url = property(lambda self: self._url)
   repo_path = property(lambda self: self._repo_path)
 
   def reify(self, share_from=None):
@@ skipping 142 matching lines @@
     """
     if not refs_and_commits:
       return
     refspec = [
       '%s:%s' % (c.hsh, r.ref)
       for r, c in refs_and_commits.iteritems()
     ]
     self.run('push', 'origin', *refspec)
     for r, c in refs_and_commits.iteritems():
       r.update_to(c)