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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1499406

Title:
  The option force_metadata = True is broken

Status in neutron:
  Fix Released

Bug description:
  Initially found here: https://bugzilla.redhat.com/show_bug.cgi?id=1256816#c9
  Patch https://review.openstack.org/#/c/211963 intreduces a regression with force_metadata = True.
  Using the option force_metadata = True can will cause neutron to fail:

  ERROR neutron.agent.dhcp.agent [-] Unable to enable dhcp for ef93213d-2525-4088-abdd-9f7854ca68e7.
  TRACE neutron.agent.dhcp.agent Traceback (most recent call last):
  TRACE neutron.agent.dhcp.agent   File "/opt/openstack/neutron/neutron/agent/dhcp/agent.py", line 115, in call_driver
  TRACE neutron.agent.dhcp.agent     getattr(driver, action)(**action_kwargs)
  TRACE neutron.agent.dhcp.agent   File "/opt/openstack/neutron/neutron/agent/linux/dhcp.py", line 205, in enable
  TRACE neutron.agent.dhcp.agent     self.spawn_process()
  TRACE neutron.agent.dhcp.agent   File "/opt/openstack/neutron/neutron/agent/linux/dhcp.py", line 413, in spawn_process
  TRACE neutron.agent.dhcp.agent     self._spawn_or_reload_process(reload_with_HUP=False)
  TRACE neutron.agent.dhcp.agent   File "/opt/openstack/neutron/neutron/agent/linux/dhcp.py", line 422, in _spawn_or_reload_process
  TRACE neutron.agent.dhcp.agent     self._output_config_files()
  TRACE neutron.agent.dhcp.agent   File "/opt/openstack/neutron/neutron/agent/linux/dhcp.py", line 449, in _output_config_files
  TRACE neutron.agent.dhcp.agent     self._output_opts_file()
  TRACE neutron.agent.dhcp.agent   File "/opt/openstack/neutron/neutron/agent/linux/dhcp.py", line 745, in _output_opts_file
  TRACE neutron.agent.dhcp.agent     options, subnet_index_map = self._generate_opts_per_subnet()
  TRACE neutron.agent.dhcp.agent   File "/opt/openstack/neutron/neutron/agent/linux/dhcp.py", line 797, in _generate_opts_per_subnet
  TRACE neutron.agent.dhcp.agent     subnet_dhcp_ip = subnet_to_interface_ip[subnet.id]
  TRACE neutron.agent.dhcp.agent UnboundLocalError: local variable 'subnet_to_interface_ip' referenced before assignment

  Meaning, neutron won't be able to spawn a new instance of dnsmasq.
  The reason for this:
  when 'force_metadata = True' and 'enable_isolated_metadata = False' (default), the subnet_to_interface_ip won't be assigned.

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