git cl patch: bail out quickly if there is no branch.

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 4388 matching lines @@
 
   # We don't want uncommitted changes mixed up with the patch.
   if git_common.is_dirty_git_tree('patch'):
     return 1
 
   if options.newbranch:
     if options.force:
       RunGit(['branch', '-D', options.newbranch],
              stderr=subprocess2.PIPE, error_ok=True)
     RunGit(['new-branch', options.newbranch])
+  elif not GetCurrentBranch():
+    DieWithError('A branch is required to apply patch. Hint: use -b option.')

[michaelpg, 2016/08/18 23:03:46]

sweet, didn't know about that option

 
   cl = Changelist(auth_config=auth_config, codereview=options.forced_codereview)
 
   if cl.IsGerrit():
     if options.reject:
       parser.error('--reject is not supported with Gerrit codereview.')
     if options.nocommit:
       parser.error('--nocommit is not supported with Gerrit codereview.')
     if options.directory:
       parser.error('--directory is not supported with Gerrit codereview.')
@@ skipping 763 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)