Avoid to use environment.

scripts/slave/upload_goma_logs.py

 #!/usr/bin/env python
 # Copyright (c) 2015 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.
 
 """upload goma related logs."""
 
 import argparse
 import os
 import sys
@@ skipping 37 matching lines @@
                       help='path of json file generated from'
                       ' ./goma_ctl.py jsonstatus')
   parser.add_argument('--skip-sendgomatsmon', action='store_true',
                       help='Represent whether send jsonstatus'
                       ' and exit_status log to TsMon.'
                       ' This option is only allowed to used when'
                       ' start() of recipe_modules/goma failes.')
 
   # Arguments set to os.environ
   parser.add_argument('--buildbot-buildername',
+                      default='unknown',
                       help='buildbot buildername')
   parser.add_argument('--buildbot-mastername',
+                      default='unknown',
                       help='buildbot mastername')
   parser.add_argument('--buildbot-slavename',
+                      default='unknown',
                       help='buildbot slavename')
   parser.add_argument('--buildbot-clobber',
                       help='buildbot clobber')
 
   args = parser.parse_args()
 
   # TODO(tikuta): Pass these variables explicitly.
   if args.buildbot_buildername:
     os.environ['BUILDBOT_BUILDERNAME'] = args.buildbot_buildername
   if args.buildbot_mastername:
@@ skipping 15 matching lines @@
                              args.goma_crash_report_id_file,
                              args.build_data_dir)
 
   if not args.skip_sendgomatsmon:
     # In the case of goma_start is failed,
     # we want log to investigate failed reason.
     # So, let me send some logs instead of
     # error in parse_args() using required option.
     assert args.json_status is not None and os.path.exists(args.json_status)
     assert args.ninja_log_exit_status is not None
-    goma_utils.SendGomaTsMon(args.json_status, args.ninja_log_exit_status)
+    goma_utils.SendGomaTsMon(args.json_status, args.ninja_log_exit_status,
+                             builder=args.buildbot_buildername,
+                             master=args.buildbot_mastername,
+                             slave=args.buildbot_slavename,
+                             clobber=args.buildbot_clobber)
 
   return 0
 
 
 if '__main__' == __name__:
   sys.exit(main())