CQ: add a timeout for socket operations

commit-queue/commit_queue.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.
 """Commit queue executable.
 
 Reuse Rietveld and the Chromium Try Server to process and automatically commit
 patches.
 """
 
 import logging
 import logging.handlers
 import optparse
 import os
 import shutil
 import signal
+import socket
 import sys
 import tempfile
 import time
 
 import find_depot_tools  # pylint: disable=W0611
 import checkout
 import fix_encoding
 import rietveld
 import subprocess2
 
@@ skipping 112 matching lines @@
       dir=os.path.dirname(db_path),
       prefix='db.debug.',
       suffix='.json',
       delete=False) as tmp_file:
     with open(db_path) as db_file:
       shutil.copyfileobj(db_file, tmp_file)
     return tmp_file.name
 
 
 def main():
+  # Set a default timeout for sockets. This is critical when talking to remote
+  # services like AppEngine and buildbot.
+  socket.setdefaulttimeout(70.0)
+
   parser = optparse.OptionParser(
       description=sys.modules['__main__'].__doc__)
   project_choices = projects.supported_projects()
   parser.add_option('-v', '--verbose', action='store_true')
   parser.add_option(
       '--no-dry-run',
       action='store_false',
       dest='dry_run',
       default=True,
       help='Run for real instead of dry-run mode which is the default. '
@@ skipping 221 matching lines @@
   # CQ generally doesn't exit by itself, but if we ever get here, it looks
   # like a clean shutdown so remove the landmine file.
   # TODO(phajdan.jr): Do we ever get here?
   os.remove(landmine_path)
   return 0
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   sys.exit(main())