Save the GIT hash of HEAD when uploading to rietveld.

tests/git_cl_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Unit tests for git_cl.py."""
 
 import os
 import StringIO
 import stat
@@ skipping 148 matching lines @@
       ((['git', 'config', 'rietveld.cc'],), ''),
       ((['git', 'config', 'branch.master.base-url'],), ''),
       ((['git', 'config', '--get-regexp', '^svn-remote\\.'],),
         (('', None), 0)),
       ((['git', 'rev-parse', '--show-cdup'],), ''),
       ((['git', 'svn', 'info'],), ''),
       ((['git', 'config', 'branch.master.rietveldissue', '1'],), ''),
       ((['git', 'config', 'branch.master.rietveldserver',
           'https://codereview.example.com'],), ''),
       ((['git', 'config', 'branch.master.rietveldpatchset', '2'],), ''),
+      ((['git', 'rev-parse', 'HEAD'],), 'hash'),
+      ((['git', 'symbolic-ref', 'HEAD'],), 'hash'),
+      ((['git', 'config', 'branch.hash.last-upload-hash', 'hash'],), ''),
     ]
 
   @staticmethod
   def _git_sanity_checks(diff_base, working_branch):
     fake_ancestor = 'fake_ancestor'
     fake_cl = 'fake_cl_for_patch'
     return [
       # Calls to verify branch point is ancestor
       ((['git', 'rev-parse', '--verify', diff_base],), fake_ancestor),
       ((['git', 'merge-base', fake_ancestor, 'HEAD'],), fake_ancestor),
@@ skipping 404 matching lines @@
         ((['git', 'config', 'rietveld.viewvc-url'],), ''),
         (('ViewVC URL:',), ''),
         # DownloadHooks(True)
         ((commit_msg_path, os.X_OK,), True),
         ]
     git_cl.main(['config'])
 
 
 if __name__ == '__main__':
   unittest.main()