[recipes.py] use argparse to set command automatically.

recipe_engine/remote.py

 # Copyright 2016 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 from __future__ import print_function
 
 import contextlib
 import logging
 import os
 import shutil
@@ skipping 40 matching lines @@
       help='The working directory of repo checkout')
   remote_p.add_argument(
       '--use-gitiles', action='store_true',
       help='Use Gitiles-specific way to fetch repo (potentially cheaper for '
            'large repos)')
   remote_p.add_argument(
       'remote_args', nargs='*',
       help='Arguments to pass to fetched repo\'s recipes.py')
 
   remote_p.set_defaults(
-    command='remote',
     bare_command=True,
     func=main,
   )
 
 
 def main(_package_deps, args):
   with ensure_workdir(args):
     checkout_dir = os.path.join(args.workdir, 'checkout')
     revision = args.revision or 'refs/heads/master'
     if args.use_gitiles:
       backend_class = fetch.GitilesBackend
     else:
       backend_class = fetch.GitBackend
     backend = backend_class(checkout_dir, args.repository, True)
     backend.checkout(revision)
     recipes_cfg = package_io.PackageFile(
         package.InfraRepoConfig().to_recipes_cfg(checkout_dir))
     cmd = [
         sys.executable,
         os.path.join(
             checkout_dir,
             recipes_cfg.read().recipes_path,
             'recipes.py'),
     ] + args.remote_args
     logging.info('Running %r', cmd)
     return subprocess.call(cmd)