Remove deprecated monkey_patch config options

These were deprecated in Queens:

  Id793ac2c5cdc5dc473f95eac53b77617a1e389da

And can now be removed.

Change-Id: I27518d1154ec09c57700905bc58ae6a3ce1d8049

22 files changed, 15 insertions, 354 deletions

diff --git a/nova/api/openstack/wsgi_app.py b/nova/api/openstack/wsgi_app.py
index bad600a0e0..3fef2df2bc 100644
--- a/nova/api/openstack/wsgi_app.py
+++ b/nova/api/openstack/wsgi_app.py
@@ -23,13 +23,11 @@ from nova import context
 from nova import exception
 from nova import objects
 from nova import service
-from nova import utils
 
 CONF = cfg.CONF
 
 CONFIG_FILES = ['api-paste.ini', 'nova.conf']
 
-utils.monkey_patch()
 objects.register_all()
 
 
diff --git a/nova/cmd/api.py b/nova/cmd/api.py
index 410c40b5f0..2080b0d5e8 100644
--- a/nova/cmd/api.py
+++ b/nova/cmd/api.py
@@ -31,7 +31,6 @@ from nova import config
 from nova import exception
 from nova import objects
 from nova import service
-from nova import utils
 from nova import version
 
 CONF = nova.conf.CONF
@@ -40,7 +39,6 @@ CONF = nova.conf.CONF
 def main():
     config.parse_args(sys.argv)
     logging.setup(CONF, "nova")
-    utils.monkey_patch()
     objects.register_all()
     gmr_opts.set_defaults(CONF)
     if 'osapi_compute' in CONF.enabled_apis:
diff --git a/nova/cmd/api_metadata.py b/nova/cmd/api_metadata.py
index 3709211260..493f3e0c8e 100644
--- a/nova/cmd/api_metadata.py
+++ b/nova/cmd/api_metadata.py
@@ -28,7 +28,6 @@ from nova import config
 from nova import objects
 from nova.objects import base as objects_base
 from nova import service
-from nova import utils
 from nova import version
 
 
@@ -38,7 +37,6 @@ CONF = nova.conf.CONF
 def main():
     config.parse_args(sys.argv)
     logging.setup(CONF, "nova")
-    utils.monkey_patch()
     objects.register_all()
     gmr_opts.set_defaults(CONF)
 
diff --git a/nova/cmd/api_os_compute.py b/nova/cmd/api_os_compute.py
index bfb530c1c8..f7d3beb10c 100644
--- a/nova/cmd/api_os_compute.py
+++ b/nova/cmd/api_os_compute.py
@@ -26,7 +26,6 @@ import nova.conf
 from nova import config
 from nova import objects
 from nova import service
-from nova import utils
 from nova import version
 
 
@@ -36,7 +35,6 @@ CONF = nova.conf.CONF
 def main():
     config.parse_args(sys.argv)
     logging.setup(CONF, "nova")
-    utils.monkey_patch()
     objects.register_all()
     gmr_opts.set_defaults(CONF)
     # NOTE(mriedem): This is needed for caching the nova-compute service
diff --git a/nova/cmd/cells.py b/nova/cmd/cells.py
index 0c18496c62..87734babef 100644
--- a/nova/cmd/cells.py
+++ b/nova/cmd/cells.py
@@ -26,7 +26,6 @@ import nova.conf
 from nova import config
 from nova import objects
 from nova import service
-from nova import utils
 from nova import version
 
 CONF = nova.conf.CONF
@@ -36,7 +35,6 @@ LOG = logging.getLogger('nova.cells')
 def main():
     config.parse_args(sys.argv)
     logging.setup(CONF, 'nova')
-    utils.monkey_patch()
     objects.register_all()
     gmr_opts.set_defaults(CONF)
 
diff --git a/nova/cmd/compute.py b/nova/cmd/compute.py
index d9f14430f1..01fd20de2e 100644
--- a/nova/cmd/compute.py
+++ b/nova/cmd/compute.py
@@ -43,7 +43,6 @@ def main():
     config.parse_args(sys.argv)
     logging.setup(CONF, 'nova')
     priv_context.init(root_helper=shlex.split(utils.get_root_helper()))
-    utils.monkey_patch()
     objects.register_all()
     gmr_opts.set_defaults(CONF)
     # Ensure os-vif objects are registered and plugins loaded
diff --git a/nova/cmd/conductor.py b/nova/cmd/conductor.py
index 4d58b5864c..16847c2e56 100644
--- a/nova/cmd/conductor.py
+++ b/nova/cmd/conductor.py
@@ -26,7 +26,6 @@ import nova.conf
 from nova import config
 from nova import objects
 from nova import service
-from nova import utils
 from nova import version
 
 CONF = nova.conf.CONF
@@ -35,7 +34,6 @@ CONF = nova.conf.CONF
 def main():
     config.parse_args(sys.argv)
     logging.setup(CONF, "nova")
-    utils.monkey_patch()
     objects.register_all()
     gmr_opts.set_defaults(CONF)
     objects.Service.enable_min_version_cache()
diff --git a/nova/cmd/network.py b/nova/cmd/network.py
index ff1273cda9..92c0bb28f3 100644
--- a/nova/cmd/network.py
+++ b/nova/cmd/network.py
@@ -30,7 +30,6 @@ from nova.network import rpcapi as network_rpcapi
 from nova import objects
 from nova.objects import base as objects_base
 from nova import service
-from nova import utils
 from nova import version
 
 CONF = nova.conf.CONF
@@ -46,7 +45,6 @@ def main():
                   'except as required for CellsV1 deployments.')
         return 1
 
-    utils.monkey_patch()
     objects.register_all()
     gmr_opts.set_defaults(CONF)
 
diff --git a/nova/cmd/scheduler.py b/nova/cmd/scheduler.py
index dafec005b4..3ea220d4d9 100644
--- a/nova/cmd/scheduler.py
+++ b/nova/cmd/scheduler.py
@@ -28,7 +28,6 @@ from nova import config
 from nova import objects
 from nova.scheduler import rpcapi as scheduler_rpcapi
 from nova import service
-from nova import utils
 from nova import version
 
 CONF = nova.conf.CONF
@@ -37,7 +36,6 @@ CONF = nova.conf.CONF
 def main():
     config.parse_args(sys.argv)
     logging.setup(CONF, "nova")
-    utils.monkey_patch()
     objects.register_all()
     gmr_opts.set_defaults(CONF)
     objects.Service.enable_min_version_cache()
diff --git a/nova/conf/base.py b/nova/conf/base.py
index d8ca1f56d6..b2fbb9258b 100644
--- a/nova/conf/base.py
+++ b/nova/conf/base.py
@@ -60,48 +60,6 @@ entry.
     cfg.StrOpt(
         'tempdir',
         help='Explicitly specify the temporary working directory.'),
-    cfg.BoolOpt(
-        'monkey_patch',
-        default=False,
-        deprecated_for_removal=True,
-        deprecated_since='17.0.0',
-        deprecated_reason="""
-Monkey patching nova is not tested, not supported, and is a barrier
-for interoperability.
-""",
-        help="""
-Determine if monkey patching should be applied.
-
-Related options:
-
-* ``monkey_patch_modules``: This must have values set for this option to
-  have any effect
-"""),
-    cfg.ListOpt(
-        'monkey_patch_modules',
-        default=['nova.compute.api:nova.notifications.notify_decorator'],
-        deprecated_for_removal=True,
-        deprecated_since='17.0.0',
-        deprecated_reason="""
-Monkey patching nova is not tested, not supported, and is a barrier
-for interoperability.
-""",
-        help="""
-List of modules/decorators to monkey patch.
-
-This option allows you to patch a decorator for all functions in specified
-modules.
-
-Possible values:
-
-* nova.compute.api:nova.notifications.notify_decorator
-* [...]
-
-Related options:
-
-* ``monkey_patch``: This must be set to ``True`` for this option to
-  have any effect
-"""),
 ]
 
 
diff --git a/nova/conf/notifications.py b/nova/conf/notifications.py
index 13ee9f3c37..91ed87966f 100644
--- a/nova/conf/notifications.py
+++ b/nova/conf/notifications.py
@@ -57,32 +57,6 @@ Possible values:
         deprecated_group='DEFAULT',
         deprecated_name='default_notification_level',
         help="Default notification level for outgoing notifications."),
-
-    cfg.StrOpt(
-        'default_publisher_id',
-        default='$host',
-        deprecated_group='DEFAULT',
-        deprecated_for_removal=True,
-        deprecated_since='17.0.0',
-        deprecated_reason="""
-This option is only used when ``monkey_patch=True`` and
-``monkey_patch_modules`` is configured to specify the legacy notify_decorator.
-Since the monkey_patch and monkey_patch_modules options are deprecated, this
-option is also deprecated.
-""",
-        help="""
-Default publisher_id for outgoing notifications. If you consider routing
-notifications using different publisher, change this value accordingly.
-
-Possible values:
-
-* Defaults to the current hostname of this host, but it can be any valid
-  oslo.messaging publisher_id
-
-Related options:
-
-*  host - Hostname, FQDN or IP address of this host.
-"""),
     cfg.StrOpt(
         'notification_format',
         choices=['unversioned', 'versioned', 'both'],
diff --git a/nova/notifications/__init__.py b/nova/notifications/__init__.py
index ff27fc2457..42d083bb88 100644
--- a/nova/notifications/__init__.py
+++ b/nova/notifications/__init__.py
@@ -21,6 +21,5 @@ from nova.notifications.base import audit_period_bounds  # noqa
 from nova.notifications.base import bandwidth_usage  # noqa
 from nova.notifications.base import image_meta  # noqa
 from nova.notifications.base import info_from_instance  # noqa
-from nova.notifications.base import notify_decorator  # noqa
 from nova.notifications.base import send_update  # noqa
 from nova.notifications.base import send_update_with_states  # noqa
diff --git a/nova/notifications/base.py b/nova/notifications/base.py
index 17640ff5ed..0bccc5cd9e 100644
--- a/nova/notifications/base.py
+++ b/nova/notifications/base.py
@@ -21,7 +21,6 @@ the system.
 import datetime
 
 from keystoneauth1 import exceptions as ks_exc
-from oslo_context import context as common_context
 from oslo_log import log
 from oslo_utils import excutils
 from oslo_utils import timeutils
@@ -46,41 +45,6 @@ LOG = log.getLogger(__name__)
 CONF = nova.conf.CONF
 
 
-# TODO(mriedem): Remove this when CONF.monkey_patch, CONF.monkey_patch_modules
-# and CONF.default_publisher_id are removed in Rocky.
-def notify_decorator(name, fn):
-    """Decorator for notify which is used from utils.monkey_patch().
-
-        :param name: name of the function
-        :param fn: - object of the function
-        :returns: fn -- decorated function
-
-    """
-    def wrapped_func(*args, **kwarg):
-        body = {}
-        body['args'] = []
-        body['kwarg'] = {}
-        for arg in args:
-            body['args'].append(arg)
-        for key in kwarg:
-            body['kwarg'][key] = kwarg[key]
-
-        ctxt = (common_context.get_context_from_function_and_args(
-                    fn, args, kwarg) or
-                common_context.get_current() or
-                nova.context.RequestContext())
-
-        notifier = rpc.get_notifier('api', publisher_id=(
-            CONF.notifications.default_publisher_id or CONF.host))
-        method = getattr(notifier,
-                         CONF.notifications.default_level.lower(),
-                         notifier.info)
-        method(ctxt, name, body)
-
-        return fn(*args, **kwarg)
-    return wrapped_func
-
-
 def send_update(context, old_instance, new_instance, service="compute",
                 host=None):
     """Send compute.instance.update notification to report any changes occurred
diff --git a/nova/tests/unit/cmd/test_cmd_db_blocks.py b/nova/tests/unit/cmd/test_cmd_db_blocks.py
index 80ad457354..8856ca2a50 100644
--- a/nova/tests/unit/cmd/test_cmd_db_blocks.py
+++ b/nova/tests/unit/cmd/test_cmd_db_blocks.py
@@ -33,10 +33,9 @@ def restore_db():
 
 
 class ComputeMainTest(test.NoDBTestCase):
-    @mock.patch('nova.utils.monkey_patch')
     @mock.patch('nova.conductor.api.API.wait_until_ready')
     @mock.patch('oslo_reports.guru_meditation_report')
-    def _call_main(self, mod, gmr, cond, patch):
+    def _call_main(self, mod, gmr, cond):
         @mock.patch.object(mod, 'config')
         @mock.patch.object(mod, 'service')
         def run_main(serv, conf):
diff --git a/nova/tests/unit/monkey_patch_example/__init__.py b/nova/tests/unit/monkey_patch_example/__init__.py
deleted file mode 100644
index bf0a9e4214..0000000000
--- a/nova/tests/unit/monkey_patch_example/__init__.py
+++ /dev/null
@@ -1,31 +0,0 @@
-# Copyright 2011 OpenStack Foundation
-# 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.
-"""Example Module for testing utils.monkey_patch()."""
-
-
-CALLED_FUNCTION = []
-
-
-def example_decorator(name, function):
-    """decorator for notify which is used from utils.monkey_patch()
-
-        :param name: name of the function
-        :param function: - object of the function
-        :returns: function -- decorated function
-    """
-    def wrapped_func(*args, **kwarg):
-        CALLED_FUNCTION.append(name)
-        return function(*args, **kwarg)
-    return wrapped_func
diff --git a/nova/tests/unit/monkey_patch_example/example_a.py b/nova/tests/unit/monkey_patch_example/example_a.py
deleted file mode 100644
index 3844766ea7..0000000000
--- a/nova/tests/unit/monkey_patch_example/example_a.py
+++ /dev/null
@@ -1,27 +0,0 @@
-# Copyright 2011 OpenStack Foundation
-# 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.
-"""Example Module A for testing utils.monkey_patch()."""
-
-
-def example_function_a():
-    return 'Example function'
-
-
-class ExampleClassA(object):
-    def example_method(self):
-        return 'Example method'
-
-    def example_method_add(self, arg1, arg2):
-        return arg1 + arg2
diff --git a/nova/tests/unit/monkey_patch_example/example_b.py b/nova/tests/unit/monkey_patch_example/example_b.py
deleted file mode 100644
index 52803377fc..0000000000
--- a/nova/tests/unit/monkey_patch_example/example_b.py
+++ /dev/null
@@ -1,28 +0,0 @@
-# Copyright 2011 OpenStack Foundation
-# 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.
-
-"""Example Module B for testing utils.monkey_patch()."""
-
-
-def example_function_b():
-    return 'Example function'
-
-
-class ExampleClassB(object):
-    def example_method(self):
-        return 'Example method'
-
-    def example_method_add(self, arg1, arg2):
-        return arg1 + arg2
diff --git a/nova/tests/unit/test_notifications.py b/nova/tests/unit/test_notifications.py
index c41d0daaa0..c77f0183a8 100644
--- a/nova/tests/unit/test_notifications.py
+++ b/nova/tests/unit/test_notifications.py
@@ -20,7 +20,6 @@ import datetime
 
 import mock
 from oslo_config import cfg
-from oslo_context import context as o_context
 from oslo_context import fixture as o_fixture
 from oslo_utils import timeutils
 
@@ -519,26 +518,6 @@ class NotificationsTestCase(test.TestCase):
     def _decorated_function(self, arg1, arg2):
         self.decorated_function_called = True
 
-    def test_notify_decorator(self):
-        func_name = self._decorated_function.__name__
-
-        # Decorated with notify_decorator like monkey_patch
-        self._decorated_function = notifications.notify_decorator(
-            func_name,
-            self._decorated_function)
-
-        ctxt = o_context.RequestContext()
-
-        self._decorated_function(1, ctxt)
-
-        self.assertEqual(1, len(fake_notifier.NOTIFICATIONS))
-        n = fake_notifier.NOTIFICATIONS[0]
-        self.assertEqual(n.priority, 'INFO')
-        self.assertEqual(n.event_type, func_name)
-        self.assertEqual(n.context, ctxt)
-        self.assertTrue(self.decorated_function_called)
-        self.assertEqual(CONF.host, n.publisher_id)
-
 
 class NotificationsFormatTestCase(test.NoDBTestCase):
 
diff --git a/nova/tests/unit/test_utils.py b/nova/tests/unit/test_utils.py
index 82b59ceef1..d45078662b 100644
--- a/nova/tests/unit/test_utils.py
+++ b/nova/tests/unit/test_utils.py
@@ -14,7 +14,6 @@
 
 import datetime
 import hashlib
-import importlib
 import os
 import os.path
 import tempfile
@@ -36,7 +35,6 @@ from oslo_utils import fixture as utils_fixture
 from oslo_utils import units
 import six
 
-import nova
 from nova import context
 from nova import exception
 from nova.objects import base as obj_base
@@ -457,74 +455,6 @@ Exit code: -2''')
              mock.call(['a', '1'], None)])
 
 
-class MonkeyPatchTestCase(test.NoDBTestCase):
-    """Unit test for utils.monkey_patch()."""
-    def setUp(self):
-        super(MonkeyPatchTestCase, self).setUp()
-        self.example_package = 'nova.tests.unit.monkey_patch_example.'
-        self.flags(
-            monkey_patch=True,
-            monkey_patch_modules=[self.example_package + 'example_a' + ':'
-            + self.example_package + 'example_decorator'])
-
-    def test_monkey_patch(self):
-        utils.monkey_patch()
-        nova.tests.unit.monkey_patch_example.CALLED_FUNCTION = []
-        from nova.tests.unit.monkey_patch_example import example_a
-        from nova.tests.unit.monkey_patch_example import example_b
-
-        self.assertEqual('Example function', example_a.example_function_a())
-        exampleA = example_a.ExampleClassA()
-        exampleA.example_method()
-        ret_a = exampleA.example_method_add(3, 5)
-        self.assertEqual(ret_a, 8)
-
-        self.assertEqual('Example function', example_b.example_function_b())
-        exampleB = example_b.ExampleClassB()
-        exampleB.example_method()
-        ret_b = exampleB.example_method_add(3, 5)
-
-        self.assertEqual(ret_b, 8)
-        package_a = self.example_package + 'example_a.'
-        self.assertIn(package_a + 'example_function_a',
-                      nova.tests.unit.monkey_patch_example.CALLED_FUNCTION)
-
-        self.assertIn(package_a + 'ExampleClassA.example_method',
-                        nova.tests.unit.monkey_patch_example.CALLED_FUNCTION)
-        self.assertIn(package_a + 'ExampleClassA.example_method_add',
-                        nova.tests.unit.monkey_patch_example.CALLED_FUNCTION)
-        package_b = self.example_package + 'example_b.'
-        self.assertNotIn(package_b + 'example_function_b',
-                         nova.tests.unit.monkey_patch_example.CALLED_FUNCTION)
-        self.assertNotIn(package_b + 'ExampleClassB.example_method',
-                         nova.tests.unit.monkey_patch_example.CALLED_FUNCTION)
-        self.assertNotIn(package_b + 'ExampleClassB.example_method_add',
-                         nova.tests.unit.monkey_patch_example.CALLED_FUNCTION)
-
-
-class MonkeyPatchDefaultTestCase(test.NoDBTestCase):
-    """Unit test for default monkey_patch_modules value."""
-
-    def setUp(self):
-        super(MonkeyPatchDefaultTestCase, self).setUp()
-        self.flags(
-            monkey_patch=True)
-
-    def test_monkey_patch_default_mod(self):
-        # monkey_patch_modules is defined to be
-        #    <module_to_patch>:<decorator_to_patch_with>
-        #  Here we check that both parts of the default values are
-        # valid
-        for module in CONF.monkey_patch_modules:
-            m = module.split(':', 1)
-            # Check we can import the module to be patched
-            importlib.import_module(m[0])
-            # check the decorator is valid
-            decorator_name = m[1].rsplit('.', 1)
-            decorator_module = importlib.import_module(decorator_name[0])
-            getattr(decorator_module, decorator_name[1])
-
-
 class AuditPeriodTest(test.NoDBTestCase):
 
     def setUp(self):
diff --git a/nova/utils.py b/nova/utils.py
index 18d633a057..55865b9dff 100644
--- a/nova/utils.py
+++ b/nova/utils.py
@@ -24,11 +24,9 @@ import functools
 import hashlib
 import inspect
 import os
-import pyclbr
 import random
 import re
 import shutil
-import sys
 import tempfile
 import time
 
@@ -469,55 +467,6 @@ def format_remote_path(host, path):
     return "%s:%s" % (safe_ip_format(host), path)
 
 
-# TODO(mriedem): Remove this in Rocky.
-def monkey_patch():
-    """DEPRECATED: If the CONF.monkey_patch set as True,
-    this function patches a decorator
-    for all functions in specified modules.
-    You can set decorators for each modules
-    using CONF.monkey_patch_modules.
-    The format is "Module path:Decorator function".
-    Example:
-    'nova.api.ec2.cloud:nova.notifications.notify_decorator'
-
-    Parameters of the decorator is as follows.
-    (See nova.notifications.notify_decorator)
-
-    name - name of the function
-    function - object of the function
-    """
-    # If CONF.monkey_patch is not True, this function do nothing.
-    if not CONF.monkey_patch:
-        return
-    LOG.warning('Monkey patching nova is deprecated for removal.')
-    if six.PY2:
-        is_method = inspect.ismethod
-    else:
-        def is_method(obj):
-            # Unbound methods became regular functions on Python 3
-            return inspect.ismethod(obj) or inspect.isfunction(obj)
-    # Get list of modules and decorators
-    for module_and_decorator in CONF.monkey_patch_modules:
-        module, decorator_name = module_and_decorator.split(':')
-        # import decorator function
-        decorator = importutils.import_class(decorator_name)
-        __import__(module)
-        # Retrieve module information using pyclbr
-        module_data = pyclbr.readmodule_ex(module)
-        for key, value in module_data.items():
-            # set the decorator for the class methods
-            if isinstance(value, pyclbr.Class):
-                clz = importutils.import_class("%s.%s" % (module, key))
-                for method, func in inspect.getmembers(clz, is_method):
-                    setattr(clz, method,
-                        decorator("%s.%s.%s" % (module, key, method), func))
-            # set the decorator for the function
-            if isinstance(value, pyclbr.Function):
-                func = importutils.import_class("%s.%s" % (module, key))
-                setattr(sys.modules[module], key,
-                    decorator("%s.%s" % (module, key), func))
-
-
 def make_dev_path(dev, partition=None, base='/dev'):
     """Return a path to a particular device.
 
diff --git a/releasenotes/notes/remove-monkey-patch-conf-220ea611d4ff348e.yaml b/releasenotes/notes/remove-monkey-patch-conf-220ea611d4ff348e.yaml
new file mode 100644
index 0000000000..8a73a1f68b
--- /dev/null
+++ b/releasenotes/notes/remove-monkey-patch-conf-220ea611d4ff348e.yaml
@@ -0,0 +1,14 @@
+---
+upgrade:
+  - |
+    The following configuration options were deprecated for removal in the
+    17.0.0 Queens release and have now been removed:
+
+    - ``[DEFAULT]/monkey_patch``
+    - ``[DEFAULT]/monkey_patch_modules``
+    - ``[notifications]/default_publisher_id``
+
+    Monkey patching nova is not tested, not supported, and is a barrier to
+    interoperability. If you have code which relies on monkey patching
+    decorators, for example, for notifications, please propose those changes
+    upstream.
diff --git a/tools/xenserver/destroy_cached_images.py b/tools/xenserver/destroy_cached_images.py
index c9025e9423..9f095a1b5c 100644
--- a/tools/xenserver/destroy_cached_images.py
+++ b/tools/xenserver/destroy_cached_images.py
@@ -44,7 +44,6 @@ if os.path.exists(os.path.join(POSSIBLE_TOPDIR, 'nova', '__init__.py')):
 
 import nova.conf
 from nova import config
-from nova import utils
 from nova.virt.xenapi import vm_utils
 
 destroy_opts = [
@@ -66,7 +65,6 @@ CONF.register_cli_opts(destroy_opts)
 
 def main():
     config.parse_args(sys.argv)
-    utils.monkey_patch()
 
     _session = session.XenAPISession(CONF.xenserver.connection_url,
                                      CONF.xenserver.connection_username,