def __init__(self, conf, plugin):
     self.conf = conf
     self.root_helper = config.get_root_helper(conf)
     self.plugin = plugin
     if not conf.interface_driver:
         LOG.error(_("You must specify an interface driver"))
     self.driver = importutils.import_object(conf.interface_driver, conf)

    def __init__(self, conf):
        self.conf = conf
        try:
            vif_driver = importutils.import_object(conf.interface_driver, conf)
        except ImportError:
            # the driver is optional
            msg = _('Error importing interface driver: %s')
            raise SystemExit(msg % conf.interface_driver)
            vif_driver = None

        try:
            self.driver = importutils.import_object(
                conf.device_driver,
                config.get_root_helper(self.conf),
                conf.loadbalancer_state_path,
                vif_driver,
                self._vip_plug_callback
            )
        except ImportError:
            msg = _('Error importing loadbalancer device driver: %s')
            raise SystemExit(msg % conf.device_driver)
        ctx = context.get_admin_context_without_session()
        self.plugin_rpc = agent_api.LbaasAgentApi(
            plugin_driver.TOPIC_PROCESS_ON_HOST,
            ctx,
            conf.host
        )
        self.needs_resync = False
        self.cache = LogicalDeviceCache()

def main():
    """Main method for cleaning up network namespaces.

    This method will make two passes checking for namespaces to delete. The
    process will identify candidates, sleep, and call garbage collect. The
    garbage collection will re-verify that the namespace meets the criteria for
    deletion (ie it is empty). The period of sleep and the 2nd pass allow
    time for the namespace state to settle, so that the check prior deletion
    will re-confirm the namespace is empty.

    The utility is designed to clean-up after the forced or unexpected
    termination of Quantum agents.

    The --force flag should only be used as part of the cleanup of a devstack
    installation as it will blindly purge namespaces and their devices. This
    option also kills any lingering DHCP instances.
    """
    eventlet.monkey_patch()

    conf = setup_conf()
    conf()
    config.setup_logging(conf)

    root_helper = agent_config.get_root_helper(conf)
    # Identify namespaces that are candidates for deletion.
    candidates = [ns for ns in
                  ip_lib.IPWrapper.get_namespaces(root_helper)
                  if eligible_for_deletion(conf, ns, conf.force)]

    if candidates:
        eventlet.sleep(2)

        for namespace in candidates:
            destroy_namespace(conf, namespace, conf.force)

    def __init__(self, host, conf=None):
        if conf:
            self.conf = conf
        else:
            self.conf = cfg.CONF
        self.root_helper = config.get_root_helper(self.conf)
        self.router_info = {}

        if not self.conf.interface_driver:
            raise SystemExit(_('An interface driver must be specified'))
        try:
            self.driver = importutils.import_object(self.conf.interface_driver,
                                                    self.conf)
        except:
            msg = _("Error importing interface driver "
                    "'%s'") % self.conf.interface_driver
            raise SystemExit(msg)

        self.context = context.get_admin_context_without_session()
        self.plugin_rpc = L3PluginApi(topics.PLUGIN, host)
        self.fullsync = True
        self.sync_sem = semaphore.Semaphore(1)
        if self.conf.use_namespaces:
            self._destroy_router_namespaces(self.conf.router_id)
        super(L3NATAgent, self).__init__(host=self.conf.host)

def kill_dhcp(conf, namespace):
    """Disable DHCP for a network if DHCP is still active."""
    root_helper = agent_config.get_root_helper(conf)
    network_id = namespace.replace(dhcp_agent.NS_PREFIX, "")

    null_delegate = NullDelegate()
    dhcp_driver = importutils.import_object(conf.dhcp_driver, conf, FakeNetwork(network_id), root_helper, null_delegate)

    if dhcp_driver.active:
        dhcp_driver.disable()

 def __init__(self, host=None):
     super(DhcpAgent, self).__init__(host=host)
     self.needs_resync = False
     self.conf = cfg.CONF
     self.cache = NetworkCache()
     self.root_helper = config.get_root_helper(self.conf)
     self.dhcp_driver_cls = importutils.import_class(self.conf.dhcp_driver)
     ctx = context.get_admin_context_without_session()
     self.plugin_rpc = DhcpPluginApi(topics.PLUGIN, ctx)
     self.device_manager = DeviceManager(self.conf, self.plugin_rpc)
     self.lease_relay = DhcpLeaseRelay(self.update_lease)

 def __init__(self, conf, plugin):
     self.conf = conf
     self.root_helper = config.get_root_helper(conf)
     self.plugin = plugin
     if not conf.interface_driver:
         raise SystemExit(_("You must specify an interface driver"))
     try:
         self.driver = importutils.import_object(conf.interface_driver, conf)
     except Exception:
         msg = _("Error importing interface driver " "'%s'") % conf.interface_driver
         raise SystemExit(msg)

def unplug_device(conf, device):
    try:
        device.link.delete()
    except RuntimeError:
        root_helper = agent_config.get_root_helper(conf)
        # Maybe the device is OVS port, so try to delete
        bridge_name = ovs_lib.get_bridge_for_iface(root_helper, device.name)
        if bridge_name:
            bridge = ovs_lib.OVSBridge(bridge_name, root_helper)
            bridge.delete_port(device.name)
        else:
            LOG.debug(_('Unable to find bridge for device: %s'), device.name)

def eligible_for_deletion(conf, namespace, force=False):
    """Determine whether a namespace is eligible for deletion.

    Eligibility is determined by having only the lo device or if force
    is passed as a parameter.
    """

    # filter out namespaces without UUID as the name
    if not re.match(NS_MANGLING_PATTERN, namespace):
        return False

    root_helper = agent_config.get_root_helper(conf)
    ip = ip_lib.IPWrapper(root_helper, namespace)
    return force or ip.namespace_is_empty()

def destroy_namespace(conf, namespace, force=False):
    """Destroy a given namespace.

    If force is True, then dhcp (if it exists) will be disabled and all
    devices will be forcibly removed.
    """

    try:
        root_helper = agent_config.get_root_helper(conf)
        ip = ip_lib.IPWrapper(root_helper, namespace)

        if force:
            kill_dhcp(conf, namespace)
            # NOTE: The dhcp driver will remove the namespace if is it empty,
            # so a second check is required here.
            if ip.netns.exists(namespace):
                for device in ip.get_devices(exclude_loopback=True):
                    unplug_device(conf, device)

        ip.garbage_collect_namespace()
    except Exception, e:
        LOG.exception(_('Error unable to destroy namespace: %s'), namespace)

    def __init__(self, host, conf=None):
        if conf:
            self.conf = conf
        else:
            self.conf = cfg.CONF
        self.root_helper = config.get_root_helper(self.conf)
        self.router_info = {}

        if not self.conf.interface_driver:
            LOG.error(_('An interface driver must be specified'))
            sys.exit(1)
        try:
            self.driver = importutils.import_object(self.conf.interface_driver,
                                                    self.conf)
        except:
            LOG.exception(_("Error importing interface driver '%s'"),
                          self.conf.interface_driver)
            sys.exit(1)
        self.plugin_rpc = L3PluginApi(topics.PLUGIN, host)
        self.fullsync = True
        self.sync_sem = semaphore.Semaphore(1)
        if self.conf.use_namespaces:
            self._destroy_all_router_namespaces()
        super(L3NATAgent, self).__init__(host=self.conf.host)

 def __init__(self, conf):
     self.conf = conf
     self.root_helper = config.get_root_helper(conf)

 def __init__(self, conf, client, driver):
     self.conf = conf
     self.root_helper = config.get_root_helper(conf)
     self.client = client
     self.driver = driver

 def test_root_default(self):
     conf = config.setup_conf()
     config.register_root_helper(conf)
     self.assertEqual(config.get_root_helper(conf), 'sudo')

 def test_root_helper(self):
     conf = config.setup_conf()
     config.register_root_helper(conf)
     conf.set_override('root_helper', 'my_root_helper')
     self.assertEqual(config.get_root_helper(conf), 'my_root_helper')