Cleanup dead code for dnsmasq

In fix of bug 1202392, there was dead code left [1]. This patch
cleans them up.

[1] https://review.openstack.org/#/c/37580/

Change-Id: I02edb9ce6ac639e84089afea5a900462e61b934a

etc/neutron/rootwrap.d/dhcp.filters

@@ -9,7 +9,7 @@
 [Filters]
 
 # dhcp-agent
-dnsmasq: EnvFilter, dnsmasq, root, NEUTRON_NETWORK_ID=
+dnsmasq: CommandFilter, dnsmasq, root
 # dhcp-agent uses kill as well, that's handled by the generic KillFilter
 # it looks like these are the only signals needed, per
 # neutron/agent/linux/dhcp.py

neutron/agent/linux/dhcp.py

@@ -18,11 +18,8 @@ import collections
 import os
 import re
 import shutil
-import socket
-import sys
 
 import netaddr
-from oslo_serialization import jsonutils
 from oslo_utils import importutils
 import six
 
@@ -286,9 +283,6 @@ class Dnsmasq(DhcpLocalProcess):
 
     _TAG_PREFIX = 'tag%d'
 
-    NEUTRON_NETWORK_ID_KEY = 'NEUTRON_NETWORK_ID'
-    NEUTRON_RELAY_SOCKET_PATH_KEY = 'NEUTRON_RELAY_SOCKET_PATH'
-
     @classmethod
     def check_version(cls):
         pass
@@ -399,7 +393,6 @@ class Dnsmasq(DhcpLocalProcess):
             cmd_callback=self._build_cmdline_callback,
             namespace=self.network.namespace,
             service=DNSMASQ_SERVICE_NAME,
-            cmd_addl_env={self.NEUTRON_NETWORK_ID_KEY: self.network.id},
             reload_cfg=reload_with_HUP,
             pid_file=pid_filename)
 
@@ -787,32 +780,6 @@ class Dnsmasq(DhcpLocalProcess):
         isolated_subnets = cls.get_isolated_subnets(network)
         return any(isolated_subnets[subnet.id] for subnet in network.subnets)
 
-    @classmethod
-    def lease_update(cls):
-        network_id = os.environ.get(cls.NEUTRON_NETWORK_ID_KEY)
-        dhcp_relay_socket = os.environ.get(cls.NEUTRON_RELAY_SOCKET_PATH_KEY)
-
-        action = sys.argv[1]
-        if action not in ('add', 'del', 'old'):
-            sys.exit()
-
-        mac_address = sys.argv[2]
-        ip_address = sys.argv[3]
-
-        if action == 'del':
-            lease_remaining = 0
-        else:
-            lease_remaining = int(os.environ.get('DNSMASQ_TIME_REMAINING', 0))
-
-        data = dict(network_id=network_id, mac_address=mac_address,
-                    ip_address=ip_address, lease_remaining=lease_remaining)
-
-        if os.path.exists(dhcp_relay_socket):
-            sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
-            sock.connect(dhcp_relay_socket)
-            sock.send(jsonutils.dumps(data))
-            sock.close()
-
 
 class DeviceManager(object):
 

neutron/tests/unit/test_linux_dhcp.py

@@ -768,18 +768,11 @@ class TestDnsmasq(TestBase):
         def mock_get_conf_file_name(kind):
             return '/dhcp/%s/%s' % (network.id, kind)
 
-        def fake_argv(index):
-            if index == 0:
-                return '/usr/local/bin/neutron-dhcp-agent'
-            else:
-                raise IndexError()
-
         # if you need to change this path here, think twice,
         # that means pid files will move around, breaking upgrades
         # or backwards-compatibility
         expected_pid_file = '/dhcp/%s/pid' % network.id
 
-        expected_env = {'NEUTRON_NETWORK_ID': network.id}
         expected = [
             'dnsmasq',
             '--no-hosts',
@@ -839,14 +832,11 @@ class TestDnsmasq(TestBase):
             )
             mocks['interface_name'].__get__ = mock.Mock(return_value='tap0')
 
-            with mock.patch.object(dhcp.sys, 'argv') as argv:
-                argv.__getitem__.side_effect = fake_argv
             dm = self._get_dnsmasq(network, test_pm)
             dm.spawn_process()
             self.assertTrue(mocks['_output_opts_file'].called)
 
             test_pm.enable.assert_called_once_with(
-                    cmd_addl_env=expected_env,
                 uuid=network.id,
                 service='dnsmasq',
                 namespace='qdhcp-ns',
@@ -1228,7 +1218,6 @@ class TestDnsmasq(TestBase):
                                              cmd_callback=mock.ANY,
                                              namespace=mock.ANY,
                                              service=mock.ANY,
-                                             cmd_addl_env=mock.ANY,
                                              reload_cfg=True,
                                              pid_file=mock.ANY)])