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[John Kasperski <jckasper@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The config option 'cfg.CONF.AGENT.use_helper_for_ns_read' defaults to
"True" as seen here:

    cfg.BoolOpt('use_helper_for_ns_read',
                default=True,
                help=_('Use the root helper to read the namespaces from '
                       'the operating system.')),

There are two places in neutron.agent.linux.ip_lib where the list of
namespaces are retrieved:

   class IPWrapper(SubProcessBase):
    def get_namespaces(cls):
        output = cls._execute([], 'netns', ('list',))
        return [l.strip() for l in output.split('\n')]

and

   class IpNetnsCommand(IpCommandBase):
    def exists(self, name):
        output = self._parent._execute(
            ['o'], 'netns', ['list'],
            run_as_root=cfg.CONF.AGENT.use_helper_for_ns_read)
        for line in output.split('\n'):
            if name == line.strip():
                return True
        return False

Both methods are calling "ip netns list", but only one is actually using the configuration option. 
Both of these methods are called through out the code.

The configuration option is not necessary in the first case therefore it
should be removed.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1500527

Title:
  Deprecate config option 'use_helper_for_ns_read'

Status in neutron:
  New

Bug description:
  The config option 'cfg.CONF.AGENT.use_helper_for_ns_read' defaults to
  "True" as seen here:

      cfg.BoolOpt('use_helper_for_ns_read',
                  default=True,
                  help=_('Use the root helper to read the namespaces from '
                         'the operating system.')),

  There are two places in neutron.agent.linux.ip_lib where the list of
  namespaces are retrieved:

     class IPWrapper(SubProcessBase):
      def get_namespaces(cls):
          output = cls._execute([], 'netns', ('list',))
          return [l.strip() for l in output.split('\n')]

  and

     class IpNetnsCommand(IpCommandBase):
      def exists(self, name):
          output = self._parent._execute(
              ['o'], 'netns', ['list'],
              run_as_root=cfg.CONF.AGENT.use_helper_for_ns_read)
          for line in output.split('\n'):
              if name == line.strip():
                  return True
          return False

  Both methods are calling "ip netns list", but only one is actually using the configuration option. 
  Both of these methods are called through out the code.

  The configuration option is not necessary in the first case therefore
  it should be removed.

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