old_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright (c) 2012 OpenStack, LLC.
  # Administrator of the National Aeronautics and Space Administration.
  # All Rights Reserved.
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  import gc
  import pprint
  import sys
  import traceback
  
  import eventlet
  import eventlet.backdoor
  import greenlet
  
  from nova import config
  from nova import flags
  from nova.openstack.common import cfg
  
  eventlet_backdoor_opts = [
      cfg.IntOpt('backdoor_port',
                 default=None,
                 help='port for eventlet backdoor to listen')
      ]
  
  CONF = config.CONF
  CONF.register_opts(eventlet_backdoor_opts)
  
  
  def dont_use_this():
      print "Don't use this, just disconnect instead"
  
  
  def find_objects(t):
      return filter(lambda o: isinstance(o, t), gc.get_objects())
  
  
  def print_greenthreads():
      for i, gt in enumerate(find_objects(greenlet.greenlet)):
          print i, gt
          traceback.print_stack(gt.gr_frame)
          print
  
  
  backdoor_locals = {
      'exit': dont_use_this,      # So we don't exit the entire process
      'quit': dont_use_this,      # So we don't exit the entire process
      'fo': find_objects,
      'pgt': print_greenthreads,
  }
  
  
  def initialize_if_enabled():
      if CONF.backdoor_port is None:
          return
  
      # NOTE(johannes): The standard sys.displayhook will print the value of
      # the last expression and set it to __builtin__._, which overwrites
      # the __builtin__._ that gettext sets. Let's switch to using pprint
      # since it won't interact poorly with gettext, and it's easier to
      # read the output too.
      def displayhook(val):
          if val is not None:
              pprint.pprint(val)
      sys.displayhook = displayhook
  
      eventlet.spawn(eventlet.backdoor.backdoor_server,
                     eventlet.listen(('localhost', CONF.backdoor_port)),
                     locals=backdoor_locals)
  
new_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright (c) 2012 OpenStack, LLC.
  # Administrator of the National Aeronautics and Space Administration.
  # All Rights Reserved.
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  import gc
  import pprint
  import sys
  import traceback
  
  import eventlet
  import eventlet.backdoor
  import greenlet
  
  from nova import config
  from nova import flags
  from nova.openstack.common import cfg
  
  eventlet_backdoor_opts = [
      cfg.IntOpt('backdoor_port',
                 default=None,
                 help='port for eventlet backdoor to listen')
      ]
  
  CONF = config.CONF
  CONF.register_opts(eventlet_backdoor_opts)
  
  
  def dont_use_this():
      print "Don't use this, just disconnect instead"
  
  
  def find_objects(t):
      return filter(lambda o: isinstance(o, t), gc.get_objects())
  
  
  def print_greenthreads():
      for i, gt in enumerate(find_objects(greenlet.greenlet)):
          print i, gt
          traceback.print_stack(gt.gr_frame)
          print
  
  
  backdoor_locals = {
      'exit': dont_use_this,      # So we don't exit the entire process
      'quit': dont_use_this,      # So we don't exit the entire process
      'fo': find_objects,
      'pgt': print_greenthreads,
  }
  
  
  def initialize_if_enabled():
      if CONF.backdoor_port is None:
          return None
  
      # NOTE(johannes): The standard sys.displayhook will print the value of
      # the last expression and set it to __builtin__._, which overwrites
      # the __builtin__._ that gettext sets. Let's switch to using pprint
      # since it won't interact poorly with gettext, and it's easier to
      # read the output too.
      def displayhook(val):
          if val is not None:
              pprint.pprint(val)
      sys.displayhook = displayhook
  
      sock = eventlet.listen(('localhost', CONF.backdoor_port))
      port = sock.getsockname()[1]
      eventlet.spawn(eventlet.backdoor.backdoor_server, sock,
                     locals=backdoor_locals)
      return port
  
subject: Add support for backdoor_port to be returned with a rpc call.