Push pending tag and synthesized commit in a single git push operation.

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 118 matching lines @@
       assert 'stdin' not in kwargs
       kwargs['stdin'] = subprocess.PIPE
     ok_ret = kwargs.pop('ok_ret', {0})
     cmd = ('git',) + args
 
     self._log.debug('Running %r', cmd)
     started = time.time()
     process = subprocess.Popen(cmd, **kwargs)
     output, errout = process.communicate(indata)
     retcode = process.poll()
-    self._log.debug('Finished in %.1f sec', time.time() - started)
+    dt = time.time() - started
+    if dt > 1:  # pragma: no cover
+      self._log.debug('Finished in %.1f sec', dt)
     if retcode not in ok_ret:
       raise CalledProcessError(retcode, cmd, output, errout)
 
     if errout:
       sys.stderr.write(errout)
     return output
 
   def intern(self, data, typ='blob'):
     return self.run(
         'hash-object', '-w', '-t', typ, '--stdin', indata=str(data)).strip()
+
+  def fast_forward_push(self, refs_and_commits):
+    """Push commits to refs on the remote, and also update refs' local copies.
+
+    Refs names are specified as refs on remote, i.e. push to
+    Ref('refs/heads/master') would update 'refs/heads/master' on remote (and on
+    local repo mirror), no ref name translation is happening.
+
+    Args:
+      refs_and_commits: dict {Ref object -> Commit to push to the ref}.
+    """
+    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)