bot_code: Add c dir to PASSLIST

appengine/swarming/swarming_bot/bot_code/bot_main.py

 # Copyright 2013 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.
 
 """Swarming bot main process.
 
 This is the program that communicates with the Swarming server, ensures the code
 is always up to date and executes a child process to run tasks and upload
 results back.
 
@@ skipping 53 matching lines @@
 
 
 # Whitelist of files that can be present in the bot's directory. Anything else
 # will be forcibly deleted on startup! Note that 'w' (work) is not in this list,
 # as we want it to be deleted on startup.
 # See
 # https://github.com/luci/luci-py/tree/master/appengine/swarming/doc/LifeOfABot.md
 # for more details.
 PASSLIST = (
   '*-cacert.pem',
+  'c',
   'cipd_cache',
   'isolated_cache',
   'logs',
   'README',
   'README.md',
   'swarming.lck',
   'swarming_bot.1.zip',
   'swarming_bot.2.zip',
   'swarming_bot.zip',
 )
@@ skipping 996 matching lines @@
 
   error = None
   if len(args) != 0:
     error = 'Unexpected arguments: %s' % args
   try:
     return run_bot(error)
   finally:
     call_hook(
         bot.Bot(None, None, None, None, base_dir, None), 'on_bot_shutdown')
     logging.info('main() returning')