Return unicode commit hashes in checkout.GitCheckout

checkout.py

 # coding=utf8
 # 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.
 """Manages a project checkout.
 
 Includes support for svn, git-svn and git.
 """
 
 import ConfigParser
@@ skipping 604 matching lines @@
     #   pulling/fetching, so it merges <ref> into the current branch without
     #   storing the remote branch anywhere locally.
     remote_tracked_path = 'refs/remotes/%s/%s' % (
         self.remote, self.remote_branch)
     self._check_call_git(
         ['pull', self.remote,
          '%s:%s' % (self.remote_branch, remote_tracked_path),
          '--quiet'])
 
   def _get_head_commit_hash(self):
-    """Gets the current revision from the local branch."""
-    return self._check_output_git(['rev-parse', 'HEAD']).strip()
+    """Gets the current revision (in unicode) from the local branch."""
+    return unicode(self._check_output_git(['rev-parse', 'HEAD']).strip())
 
   def apply_patch(self, patches, post_processors=None, verbose=False):
     """Applies a patch on 'working_branch' and switches to it.
 
     Also commits the changes on the local branch.
 
     Ignores svn properties and raise an exception on unexpected ones.
     """
     post_processors = post_processors or self.post_processors or []
     # It this throws, the checkout is corrupted. Maybe worth deleting it and
@@ skipping 184 matching lines @@
   def revisions(self, rev1, rev2):
     return self.checkout.revisions(rev1, rev2)
 
   @property
   def project_name(self):
     return self.checkout.project_name
 
   @property
   def project_path(self):
     return self.checkout.project_path