Add 'fetch' command to gclient with support for --jobs.

gclient.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.
 
 """Meta checkout manager supporting both Subversion and GIT.
 
 Files
   .gclient      : Current client configuration, written by 'config' command.
                   Format is a Python script defining 'solutions', a list whose
@@ skipping 1148 matching lines @@
       env['GCLIENT_SCM'] = scm
     if url:
       env['GCLIENT_URL'] = url
     if os.path.isdir(cwd):
       subprocess2.call(args, cwd=cwd, env=env)
     else:
       print >> sys.stderr, 'Skipped missing %s' % cwd
   return 0
 
 
+def CMDfetch(parser, args):
+  """Fetches upstream commits for all modules.
+
+Completely git-specific. Simply runs 'git fetch origin' for each module.
+"""
+  parser.remove_option('--jobs')

[M-A Ruel, 2012/02/27 16:52:48]

It's useful and safe to do them in parallel. I'd keep --jobs.

+  (options, parsed_args) = parser.parse_args(args)

[M-A Ruel, 2012/02/27 16:52:48]

Why parse the arguments here? Just forward the modified args directly to
CMDrecurse?

+  if parsed_args:
+    print >> sys.stderr, 'Fetch accepts no arguments!'
+    return 1
+  args.extend('-s git git fetch origin'.split(' '))

[M-A Ruel, 2012/02/27 16:52:48]

Let's do
args = ['-s', 'git', 'git', 'fetch'] + args
so origin is not specified by default, so people with multiple remote have all
the remote fetched by default and that specifying a remote work properly, e.g.
gclient fetch origin
works intuitively.

+  # Add jobs option back, so CMDrecurse doesn't freak.
+  parser.add_option('--jobs')
+  return CMDrecurse(parser, args)
+
+
 @attr('usage', '[url] [safesync url]')
 def CMDconfig(parser, args):
   """Create a .gclient file in the current directory.
 
 This specifies the configuration for further commands. After update/sync,
 top-level DEPS files in each module are read to determine dependent
 modules to operate on as well. If optional [url] parameter is
 provided, then configuration is read from a specified Subversion server
 URL.
 """
@@ skipping 359 matching lines @@
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
     print >> sys.stderr, 'Error: %s' % str(e)
     return 1
 
 
 if '__main__' == __name__:
   fix_encoding.fix_encoding()
   sys.exit(Main(sys.argv[1:]))
 
 # vim: ts=2:sw=2:tw=80:et: