Add an assert to ensure UTF-8 locale when handling file paths.

appengine/swarming/tools/start_servers.py

 #!/usr/bin/env python
 # Copyright 2015 The Swarming Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 """Starts local Swarming and Isolate servers."""
 
 import argparse
 import os
 import shutil
 import sys
 import tempfile
 
 
 APP_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+CLIENT_DIR = os.path.join(os.path.dirname(os.path.dirname(APP_DIR)), 'client')
 sys.path.insert(0, APP_DIR)
 
+sys.path.insert(0, CLIENT_DIR)
+from third_party.depot_tools import fix_encoding
+sys.path.pop(0)
+
 import test_env
 test_env.setup_test_env()
 
 from tool_support import local_app
 
 
 class LocalServers(object):
   """Local Swarming and Isolate servers."""
   def __init__(self, listen_all):
     self._isolate_server = None
@@ skipping 53 matching lines @@
       self._swarming_server.wait()
 
   def dump_log(self):
     if self._isolate_server:
       self._isolate_server.dump_log()
     if self._swarming_server:
       self._swarming_server.dump_log()
 
 
 def main():
+  fix_encoding.fix_encoding()
   parser = argparse.ArgumentParser(description=sys.modules[__name__].__doc__)
   parser.add_argument('-a', '--all', action='store_true')
   args = parser.parse_args()
   servers = LocalServers(args.all)
   try:
     servers.start()
     print('Swarming: %s' % servers.swarming_server.url)
     print('Isolate : %s' % servers.isolate_server.url)
     servers.wait()
     servers.dump_log()
   except KeyboardInterrupt:
     print >> sys.stderr, '<Ctrl-C> received; stopping servers'
   finally:
     exit_code = servers.stop(False)
   return exit_code
 
 
 if __name__ == '__main__':
   sys.exit(main())