Add --output option to Swarming client and pass it through to the bot

client/example/common.py

 # Copyright 2012 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.
 
 import datetime
 import getpass
 import hashlib
 import optparse
 import os
 import subprocess
@@ skipping 18 matching lines @@
 def parse_args(use_isolate_server, use_swarming):
   """Process arguments for the example scripts."""
   os.chdir(ROOT_DIR)
   colorama.init()
 
   parser = optparse.OptionParser(description=sys.modules['__main__'].__doc__)
   if use_isolate_server:
     parser.add_option(
         '-I', '--isolate-server',
         metavar='URL', default=os.environ.get('ISOLATE_SERVER', ''),
-        help='Isolate server to use')
+        help='Isolate server to use (default: ISOLATE_SERVER env var)')
   if use_swarming:
     task_name = '%s-%s-hello_world' % (
       getpass.getuser(),
       datetime.datetime.now().strftime('%Y-%m-%d-%H-%M-%S'))
     parser.add_option(
         '--idempotent', action='store_true',
         help='Tells Swarming to reused previous task result if possible')
     parser.add_option(
         '-S', '--swarming',
         metavar='URL', default=os.environ.get('SWARMING_SERVER', ''),
-        help='Swarming server to use')
+        help='Swarming server to use (default: SWARMING_SERVER env var)')
     parser.add_option(
         '-o', '--os', default=sys.platform,
         help='Swarming slave OS to request. Should be one of the valid '
              'sys.platform values like darwin, linux2 or win32 default: '
              '%default.')
     parser.add_option(
         '-t', '--task-name', default=task_name,
         help='Swarming task name, default is based on time: %default')
     parser.add_option(
         '--service-account',
@@ skipping 62 matching lines @@
         'isolate.py',
         'archive',
         '--isolate', os.path.join('payload', 'hello_world.isolate'),
         '--isolated', isolated,
         '--isolate-server', isolate_server,
         '--config-variable', 'OS', swarming_os,
       ], verbose)
   with open(isolated, 'rb') as f:
     hashval = hashlib.sha1(f.read()).hexdigest()
   return isolated, hashval