git cl upload: add --message-file to provide arbitrary messages.

git_cl.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.
 
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 """A git-command for integrating reviews on Rietveld and Gerrit."""
 
 from __future__ import print_function
@@ skipping 3707 matching lines @@
   Can also set the above globally by using the --global flag.
   """
   parser.add_option('--bypass-hooks', action='store_true', dest='bypass_hooks',
                     help='bypass upload presubmit hook')
   parser.add_option('--bypass-watchlists', action='store_true',
                     dest='bypass_watchlists',
                     help='bypass watchlists auto CC-ing reviewers')
   parser.add_option('-f', action='store_true', dest='force',
                     help="force yes to questions (don't prompt)")
   parser.add_option('-m', dest='message', help='message for patchset')
+  parser.add_option('--message-file', dest='message_file',
+                    help='file which contains message for patchset')
   parser.add_option('-t', dest='title',
                     help='title for patchset (Rietveld only)')
   parser.add_option('-r', '--reviewers',
                     action='append', default=[],
                     help='reviewer email addresses')
   parser.add_option('--cc',
                     action='append', default=[],
                     help='cc email addresses')
   parser.add_option('-s', '--send-mail', action='store_true',
                     help='send email to reviewer immediately')
@@ skipping 35 matching lines @@
   (options, args) = parser.parse_args(args)
   _process_codereview_select_options(parser, options)
   auth_config = auth.extract_auth_config_from_options(options)
 
   if git_common.is_dirty_git_tree('upload'):
     return 1
 
   options.reviewers = cleanup_list(options.reviewers)
   options.cc = cleanup_list(options.cc)
 
+  if options.message_file:
+    if options.message:
+      parser.error('only one of --message and --message-file allowed.')
+    options.message = gclient_utils.FileRead(options.message_file)
+    options.message_file = None
+
   # For sanity of test expectations, do this otherwise lazy-loading *now*.
   settings.GetIsGerrit()
 
   cl = Changelist(auth_config=auth_config, codereview=options.forced_codereview)
   return cl.CMDUpload(options, args, orig_args)
 
 
 def IsSubmoduleMergeCommit(ref):
   # When submodules are added to the repo, we expect there to be a single
   # non-git-svn merge commit at remote HEAD with a signature comment.
@@ skipping 1278 matching lines @@
 if __name__ == '__main__':
   # These affect sys.stdout so do it outside of main() to simplify mocks in
   # unit testing.
   fix_encoding.fix_encoding()
   setup_color.init()
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)