[NaCl SDK] Convert python scripts from optparse to argparse.

native_client_sdk/src/build_tools/build_updater.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.
 
 """Build script to generate a new sdk_tools bundle.
 
 This script packages the files necessary to generate the SDK updater -- the
 tool users run to download new bundles, update existing bundles, etc.
 """
 
+import argparse
 import buildbot_common
 import build_version
 import glob
-import optparse
 import os
 import sys
 
 SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
 SDK_SRC_DIR = os.path.dirname(SCRIPT_DIR)
 SDK_DIR = os.path.dirname(SDK_SRC_DIR)
 SRC_DIR = os.path.dirname(SDK_DIR)
 NACL_DIR = os.path.join(SRC_DIR, 'native_client')
 CYGTAR = os.path.join(NACL_DIR, 'build', 'cygtar.py')
 
@@ skipping 141 matching lines @@
   tarname = os.path.join(out_dir, 'sdk_tools.tgz')
   files_to_tar = [os.path.relpath(out_file, sdktoolsdir)
       for out_file in out_files if out_file.startswith(sdktoolsdir)]
   buildbot_common.RemoveFile(tarname)
   buildbot_common.Run([sys.executable, CYGTAR, '-C',
       os.path.join(out_dir, sdktoolsdir), '-czf', tarname] + files_to_tar)
   sys.stdout.write('\n')
 
 
 def main(args):
-  parser = optparse.OptionParser()
-  parser.add_option('-o', '--out', help='output directory',
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('-o', '--out', help='output directory',
       dest='out_dir', default=os.path.join(SRC_DIR, 'out'))
-  parser.add_option('-r', '--revision', help='revision number of this updater',
-      dest='revision', default=None)
-  parser.add_option('-v', '--verbose', help='verbose output')
-  options, args = parser.parse_args(args)
+  parser.add_argument('-r', '--revision', dest='revision', default=None,
+      help='revision number of this updater')
+  parser.add_argument('-v', '--verbose', help='verbose output')
+  options = parser.parse_args(args)
 
   buildbot_common.verbose = options.verbose
 
   if options.revision:
     options.revision = int(options.revision)
   BuildUpdater(options.out_dir, options.revision)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))