This is basic network injection for XenServer, and includes:

o  Modification of the /etc/network/interfaces file within the image using code taken from and now shared with libvirt_conn.  This is for compatibility with legacy Linux images without a guest agent.

o  Setting of xenstore keys before instance boot, intended for the XenServer Windows agent.  The agent will use these to configure the network at boot-time.

This change does not implement live reconfiguration, which is on another blueprint:

https://blueprints.launchpad.net/nova/+spec/xs-inject-networking

It does include template code to detect the presence of agents and avoid modifying the filesystem if they are injection-capable.

4 files changed, 294 insertions, 61 deletions

diff --git a/nova/tests/db/fakes.py b/nova/tests/db/fakes.py
index 2d25d5fc5..21a5481bd 100644
--- a/nova/tests/db/fakes.py
+++ b/nova/tests/db/fakes.py
@@ -24,7 +24,7 @@ from nova import test
 from nova import utils
 
 
-def stub_out_db_instance_api(stubs):
+def stub_out_db_instance_api(stubs, injected=True):
     """ Stubs out the db API for creating Instances """
 
     INSTANCE_TYPES = {
@@ -56,6 +56,25 @@ def stub_out_db_instance_api(stubs):
                  flavorid=5,
                  rxtx_cap=5)}
 
+    network_fields = {
+        'id': 'test',
+        'bridge': 'xenbr0',
+        'label': 'test_network',
+        'netmask': '255.255.255.0',
+        'cidr_v6': 'fe80::a00:0/120',
+        'netmask_v6': '120',
+        'gateway': '10.0.0.1',
+        'gateway_v6': 'fe80::a00:1',
+        'broadcast': '10.0.0.255',
+        'dns': '10.0.0.2',
+        'ra_server': None,
+        'injected': injected}
+
+    fixed_ip_fields = {
+        'address': '10.0.0.3',
+        'address_v6': 'fe80::a00:3',
+        'network_id': 'test'}
+
     class FakeModel(object):
         """ Stubs out for model """
         def __init__(self, values):
@@ -76,38 +95,29 @@ def stub_out_db_instance_api(stubs):
     def fake_instance_type_get_by_name(context, name):
         return INSTANCE_TYPES[name]
 
-    def fake_instance_create(values):
-        """ Stubs out the db.instance_create method """
-
-        type_data = INSTANCE_TYPES[values['instance_type']]
-
-        base_options = {
-            'name': values['name'],
-            'id': values['id'],
-            'reservation_id': utils.generate_uid('r'),
-            'image_id': values['image_id'],
-            'kernel_id': values['kernel_id'],
-            'ramdisk_id': values['ramdisk_id'],
-            'state_description': 'scheduling',
-            'user_id': values['user_id'],
-            'project_id': values['project_id'],
-            'launch_time': time.strftime('%Y-%m-%dT%H:%M:%SZ', time.gmtime()),
-            'instance_type': values['instance_type'],
-            'memory_mb': type_data['memory_mb'],
-            'mac_address': values['mac_address'],
-            'vcpus': type_data['vcpus'],
-            'local_gb': type_data['local_gb'],
-            'os_type': values['os_type']}
-
-        return FakeModel(base_options)
-
     def fake_network_get_by_instance(context, instance_id):
-        fields = {
-            'bridge': 'xenbr0',
-            }
-        return FakeModel(fields)
+        return FakeModel(network_fields)
+
+    def fake_network_get_all_by_instance(context, instance_id):
+        return [FakeModel(network_fields)]
+
+    def fake_instance_get_fixed_address(context, instance_id):
+        return FakeModel(fixed_ip_fields).address
+
+    def fake_instance_get_fixed_address_v6(context, instance_id):
+        return FakeModel(fixed_ip_fields).address
+
+    def fake_fixed_ip_get_all_by_instance(context, instance_id):
+        return [FakeModel(fixed_ip_fields)]
 
-    stubs.Set(db, 'instance_create', fake_instance_create)
     stubs.Set(db, 'network_get_by_instance', fake_network_get_by_instance)
     stubs.Set(db, 'instance_type_get_all', fake_instance_type_get_all)
     stubs.Set(db, 'instance_type_get_by_name', fake_instance_type_get_by_name)
+    stubs.Set(db, 'instance_get_fixed_address',
+        fake_instance_get_fixed_address)
+    stubs.Set(db, 'instance_get_fixed_address_v6',
+        fake_instance_get_fixed_address_v6)
+    stubs.Set(db, 'network_get_all_by_instance',
+        fake_network_get_all_by_instance)
+    stubs.Set(db, 'fixed_ip_get_all_by_instance',
+        fake_fixed_ip_get_all_by_instance)
diff --git a/nova/tests/fake_utils.py b/nova/tests/fake_utils.py
new file mode 100644
index 000000000..823c775cb
--- /dev/null
+++ b/nova/tests/fake_utils.py
@@ -0,0 +1,106 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright (c) 2011 Citrix Systems, Inc.
+#
+#    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.
+
+"""This modules stubs out functions in nova.utils
+"""
+
+import re
+import types
+
+from eventlet import greenthread
+
+from nova import exception
+from nova import log as logging
+from nova import utils
+
+LOG = logging.getLogger('nova.tests.fake_utils')
+
+_fake_execute_repliers = []
+_fake_execute_log = []
+
+
+def fake_execute_get_log():
+    return _fake_execute_log
+
+
+def fake_execute_clear_log():
+    global _fake_execute_log
+    _fake_execute_log = []
+
+
+def fake_execute_set_repliers(repliers):
+    """Allows the client to configure replies to commands"""
+    global _fake_execute_repliers
+    _fake_execute_repliers = repliers
+
+
+def fake_execute_default_reply_handler(*ignore_args, **ignore_kwargs):
+    """A reply handler for commands that haven't been added to the reply
+    list.  Returns empty strings for stdout and stderr
+    """
+    return '', ''
+
+
+def fake_execute(*cmd_parts, **kwargs):
+    """This function stubs out execute, optionally executing
+    a preconfigued function to return expected data
+    """
+    global _fake_execute_repliers
+
+    process_input = kwargs.get('process_input', None)
+    addl_env = kwargs.get('addl_env', None)
+    check_exit_code = kwargs.get('check_exit_code', 0)
+    cmd_str = ' '.join(str(part) for part in cmd_parts)
+
+    LOG.debug(_("Faking execution of cmd (subprocess): %s"), cmd_str)
+    _fake_execute_log.append(cmd_str)
+
+    reply_handler = fake_execute_default_reply_handler
+
+    for fake_replier in _fake_execute_repliers:
+        if re.match(fake_replier[0], cmd_str):
+            reply_handler = fake_replier[1]
+            LOG.debug(_('Faked command matched %s') % fake_replier[0])
+            break
+
+    if isinstance(reply_handler, basestring):
+        # If the reply handler is a string, return it as stdout
+        reply = reply_handler, ''
+    else:
+        try:
+            # Alternative is a function, so call it
+            reply = reply_handler(cmd_parts,
+                                  process_input=process_input,
+                                  addl_env=addl_env,
+                                  check_exit_code=check_exit_code)
+        except exception.ProcessExecutionError as e:
+            LOG.debug(_('Faked command raised an exception %s' % str(e)))
+            raise
+
+    stdout = reply[0]
+    stderr = reply[1]
+    LOG.debug(_("Reply to faked command is stdout='%(stdout)s' "
+                "stderr='%(stderr)s'") % locals())
+
+    # Replicate the sleep call in the real function
+    greenthread.sleep(0)
+    return reply
+
+
+def stub_out_utils_execute(stubs):
+    fake_execute_set_repliers([])
+    fake_execute_clear_log()
+    stubs.Set(utils, 'execute', fake_execute)
diff --git a/nova/tests/test_xenapi.py b/nova/tests/test_xenapi.py
index e54ffe712..36c88b020 100644
--- a/nova/tests/test_xenapi.py
+++ b/nova/tests/test_xenapi.py
@@ -19,11 +19,15 @@ Test suite for XenAPI
 """
 
 import functools
+import os
+import re
 import stubout
+import ast
 
 from nova import db
 from nova import context
 from nova import flags
+from nova import log as logging
 from nova import test
 from nova import utils
 from nova.auth import manager
@@ -38,6 +42,9 @@ from nova.virt.xenapi.vmops import VMOps
 from nova.tests.db import fakes as db_fakes
 from nova.tests.xenapi import stubs
 from nova.tests.glance import stubs as glance_stubs
+from nova.tests import fake_utils
+
+LOG = logging.getLogger('nova.tests.test_xenapi')
 
 FLAGS = flags.FLAGS
 
@@ -64,13 +71,14 @@ class XenAPIVolumeTestCase(test.TestCase):
     def setUp(self):
         super(XenAPIVolumeTestCase, self).setUp()
         self.stubs = stubout.StubOutForTesting()
+        self.context = context.RequestContext('fake', 'fake', False)
         FLAGS.target_host = '127.0.0.1'
         FLAGS.xenapi_connection_url = 'test_url'
         FLAGS.xenapi_connection_password = 'test_pass'
         db_fakes.stub_out_db_instance_api(self.stubs)
         stubs.stub_out_get_target(self.stubs)
         xenapi_fake.reset()
-        self.values = {'name': 1, 'id': 1,
+        self.values = {'id': 1,
                   'project_id': 'fake',
                   'user_id': 'fake',
                   'image_id': 1,
@@ -90,7 +98,7 @@ class XenAPIVolumeTestCase(test.TestCase):
         vol['availability_zone'] = FLAGS.storage_availability_zone
         vol['status'] = "creating"
         vol['attach_status'] = "detached"
-        return db.volume_create(context.get_admin_context(), vol)
+        return db.volume_create(self.context, vol)
 
     def test_create_iscsi_storage(self):
         """ This shows how to test helper classes' methods """
@@ -126,7 +134,7 @@ class XenAPIVolumeTestCase(test.TestCase):
         stubs.stubout_session(self.stubs, stubs.FakeSessionForVolumeTests)
         conn = xenapi_conn.get_connection(False)
         volume = self._create_volume()
-        instance = db.instance_create(self.values)
+        instance = db.instance_create(self.context, self.values)
         vm = xenapi_fake.create_vm(instance.name, 'Running')
         result = conn.attach_volume(instance.name, volume['id'], '/dev/sdc')
 
@@ -146,7 +154,7 @@ class XenAPIVolumeTestCase(test.TestCase):
                               stubs.FakeSessionForVolumeFailedTests)
         conn = xenapi_conn.get_connection(False)
         volume = self._create_volume()
-        instance = db.instance_create(self.values)
+        instance = db.instance_create(self.context, self.values)
         xenapi_fake.create_vm(instance.name, 'Running')
         self.assertRaises(Exception,
                           conn.attach_volume,
@@ -175,8 +183,9 @@ class XenAPIVMTestCase(test.TestCase):
         self.project = self.manager.create_project('fake', 'fake', 'fake')
         self.network = utils.import_object(FLAGS.network_manager)
         self.stubs = stubout.StubOutForTesting()
-        FLAGS.xenapi_connection_url = 'test_url'
-        FLAGS.xenapi_connection_password = 'test_pass'
+        self.flags(xenapi_connection_url='test_url',
+                   xenapi_connection_password='test_pass',
+                   instance_name_template='%d')
         xenapi_fake.reset()
         xenapi_fake.create_local_srs()
         db_fakes.stub_out_db_instance_api(self.stubs)
@@ -189,6 +198,8 @@ class XenAPIVMTestCase(test.TestCase):
         stubs.stub_out_vm_methods(self.stubs)
         glance_stubs.stubout_glance_client(self.stubs,
                                            glance_stubs.FakeGlance)
+        fake_utils.stub_out_utils_execute(self.stubs)
+        self.context = context.RequestContext('fake', 'fake', False)
         self.conn = xenapi_conn.get_connection(False)
 
     def test_list_instances_0(self):
@@ -213,7 +224,7 @@ class XenAPIVMTestCase(test.TestCase):
                 if not vm_rec["is_control_domain"]:
                     vm_labels.append(vm_rec["name_label"])
 
-            self.assertEquals(vm_labels, [1])
+            self.assertEquals(vm_labels, ['1'])
 
         def ensure_vbd_was_torn_down():
             vbd_labels = []
@@ -221,7 +232,7 @@ class XenAPIVMTestCase(test.TestCase):
                 vbd_rec = xenapi_fake.get_record('VBD', vbd_ref)
                 vbd_labels.append(vbd_rec["vm_name_label"])
 
-            self.assertEquals(vbd_labels, [1])
+            self.assertEquals(vbd_labels, ['1'])
 
         def ensure_vdi_was_torn_down():
             for vdi_ref in xenapi_fake.get_all('VDI'):
@@ -238,11 +249,10 @@ class XenAPIVMTestCase(test.TestCase):
 
     def create_vm_record(self, conn, os_type):
         instances = conn.list_instances()
-        self.assertEquals(instances, [1])
+        self.assertEquals(instances, ['1'])
 
         # Get Nova record for VM
         vm_info = conn.get_info(1)
-
         # Get XenAPI record for VM
         vms = [rec for ref, rec
                in xenapi_fake.get_all_records('VM').iteritems()
@@ -251,7 +261,7 @@ class XenAPIVMTestCase(test.TestCase):
         self.vm_info = vm_info
         self.vm = vm
 
-    def check_vm_record(self, conn):
+    def check_vm_record(self, conn, check_injection=False):
         # Check that m1.large above turned into the right thing.
         instance_type = db.instance_type_get_by_name(conn, 'm1.large')
         mem_kib = long(instance_type['memory_mb']) << 10
@@ -271,6 +281,25 @@ class XenAPIVMTestCase(test.TestCase):
         # Check that the VM is running according to XenAPI.
         self.assertEquals(self.vm['power_state'], 'Running')
 
+        if check_injection:
+            xenstore_data = self.vm['xenstore_data']
+            key = 'vm-data/networking/aabbccddeeff'
+            xenstore_value = xenstore_data[key]
+            tcpip_data = ast.literal_eval(xenstore_value)
+            self.assertEquals(tcpip_data, {
+                'label': 'test_network',
+                'broadcast': '10.0.0.255',
+                'ips': [{'ip': '10.0.0.3',
+                         'netmask':'255.255.255.0',
+                         'enabled':'1'}],
+                'ip6s': [{'ip': 'fe80::a8bb:ccff:fedd:eeff',
+                          'netmask': '120',
+                          'enabled': '1',
+                          'gateway': 'fe80::a00:1'}],
+                'mac': 'aa:bb:cc:dd:ee:ff',
+                'dns': ['10.0.0.2'],
+                'gateway': '10.0.0.1'})
+
     def check_vm_params_for_windows(self):
         self.assertEquals(self.vm['platform']['nx'], 'true')
         self.assertEquals(self.vm['HVM_boot_params'], {'order': 'dc'})
@@ -304,10 +333,10 @@ class XenAPIVMTestCase(test.TestCase):
         self.assertEquals(self.vm['HVM_boot_policy'], '')
 
     def _test_spawn(self, image_id, kernel_id, ramdisk_id,
-                    instance_type="m1.large", os_type="linux"):
-        stubs.stubout_session(self.stubs, stubs.FakeSessionForVMTests)
-        values = {'name': 1,
-                  'id': 1,
+                    instance_type="m1.large", os_type="linux",
+                    check_injection=False):
+        stubs.stubout_loopingcall_start(self.stubs)
+        values = {'id': 1,
                   'project_id': self.project.id,
                   'user_id': self.user.id,
                   'image_id': image_id,
@@ -316,12 +345,10 @@ class XenAPIVMTestCase(test.TestCase):
                   'instance_type': instance_type,
                   'mac_address': 'aa:bb:cc:dd:ee:ff',
                   'os_type': os_type}
-
-        conn = xenapi_conn.get_connection(False)
-        instance = db.instance_create(values)
-        conn.spawn(instance)
-        self.create_vm_record(conn, os_type)
-        self.check_vm_record(conn)
+        instance = db.instance_create(self.context, values)
+        self.conn.spawn(instance)
+        self.create_vm_record(self.conn, os_type)
+        self.check_vm_record(self.conn, check_injection)
 
     def test_spawn_not_enough_memory(self):
         FLAGS.xenapi_image_service = 'glance'
@@ -362,6 +389,85 @@ class XenAPIVMTestCase(test.TestCase):
                          glance_stubs.FakeGlance.IMAGE_RAMDISK)
         self.check_vm_params_for_linux_with_external_kernel()
 
+    def test_spawn_netinject_file(self):
+        FLAGS.xenapi_image_service = 'glance'
+        db_fakes.stub_out_db_instance_api(self.stubs, injected=True)
+
+        self._tee_executed = False
+
+        def _tee_handler(cmd, **kwargs):
+            input = kwargs.get('process_input', None)
+            self.assertNotEqual(input, None)
+            config = [line.strip() for line in input.split("\n")]
+            # Find the start of eth0 configuration and check it
+            index = config.index('auto eth0')
+            self.assertEquals(config[index + 1:index + 8], [
+                'iface eth0 inet static',
+                'address 10.0.0.3',
+                'netmask 255.255.255.0',
+                'broadcast 10.0.0.255',
+                'gateway 10.0.0.1',
+                'dns-nameservers 10.0.0.2',
+                ''])
+            self._tee_executed = True
+            return '', ''
+
+        fake_utils.fake_execute_set_repliers([
+            # Capture the sudo tee .../etc/network/interfaces command
+            (r'(sudo\s+)?tee.*interfaces', _tee_handler),
+        ])
+        FLAGS.xenapi_image_service = 'glance'
+        self._test_spawn(glance_stubs.FakeGlance.IMAGE_MACHINE,
+                         glance_stubs.FakeGlance.IMAGE_KERNEL,
+                         glance_stubs.FakeGlance.IMAGE_RAMDISK,
+                         check_injection=True)
+        self.assertTrue(self._tee_executed)
+
+    def test_spawn_netinject_xenstore(self):
+        FLAGS.xenapi_image_service = 'glance'
+        db_fakes.stub_out_db_instance_api(self.stubs, injected=True)
+
+        self._tee_executed = False
+
+        def _mount_handler(cmd, *ignore_args, **ignore_kwargs):
+            # When mounting, create real files under the mountpoint to simulate
+            # files in the mounted filesystem
+
+            # mount point will be the last item of the command list
+            self._tmpdir = cmd[len(cmd) - 1]
+            LOG.debug(_('Creating files in %s to simulate guest agent' %
+                self._tmpdir))
+            os.makedirs(os.path.join(self._tmpdir, 'usr', 'sbin'))
+            # Touch the file using open
+            open(os.path.join(self._tmpdir, 'usr', 'sbin',
+                'xe-update-networking'), 'w').close()
+            return '', ''
+
+        def _umount_handler(cmd, *ignore_args, **ignore_kwargs):
+            # Umount would normall make files in the m,ounted filesystem
+            # disappear, so do that here
+            LOG.debug(_('Removing simulated guest agent files in %s' %
+                self._tmpdir))
+            os.remove(os.path.join(self._tmpdir, 'usr', 'sbin',
+                'xe-update-networking'))
+            os.rmdir(os.path.join(self._tmpdir, 'usr', 'sbin'))
+            os.rmdir(os.path.join(self._tmpdir, 'usr'))
+            return '', ''
+
+        def _tee_handler(cmd, *ignore_args, **ignore_kwargs):
+            self._tee_executed = True
+            return '', ''
+
+        fake_utils.fake_execute_set_repliers([
+            (r'(sudo\s+)?mount', _mount_handler),
+            (r'(sudo\s+)?umount', _umount_handler),
+            (r'(sudo\s+)?tee.*interfaces', _tee_handler)])
+        self._test_spawn(1, 2, 3, check_injection=True)
+
+        # tee must not run in this case, where an injection-capable
+        # guest agent is detected
+        self.assertFalse(self._tee_executed)
+
     def test_spawn_with_network_qos(self):
         self._create_instance()
         for vif_ref in xenapi_fake.get_all('VIF'):
@@ -371,6 +477,7 @@ class XenAPIVMTestCase(test.TestCase):
                               str(4 * 1024))
 
     def test_rescue(self):
+        self.flags(xenapi_inject_image=False)
         instance = self._create_instance()
         conn = xenapi_conn.get_connection(False)
         conn.rescue(instance, None)
@@ -391,8 +498,8 @@ class XenAPIVMTestCase(test.TestCase):
 
     def _create_instance(self):
         """Creates and spawns a test instance"""
+        stubs.stubout_loopingcall_start(self.stubs)
         values = {
-            'name': 1,
             'id': 1,
             'project_id': self.project.id,
             'user_id': self.user.id,
@@ -402,7 +509,7 @@ class XenAPIVMTestCase(test.TestCase):
             'instance_type': 'm1.large',
             'mac_address': 'aa:bb:cc:dd:ee:ff',
             'os_type': 'linux'}
-        instance = db.instance_create(values)
+        instance = db.instance_create(self.context, values)
         self.conn.spawn(instance)
         return instance
 
@@ -447,21 +554,26 @@ class XenAPIMigrateInstance(test.TestCase):
         db_fakes.stub_out_db_instance_api(self.stubs)
         stubs.stub_out_get_target(self.stubs)
         xenapi_fake.reset()
+        xenapi_fake.create_network('fake', FLAGS.flat_network_bridge)
         self.manager = manager.AuthManager()
         self.user = self.manager.create_user('fake', 'fake', 'fake',
                                              admin=True)
         self.project = self.manager.create_project('fake', 'fake', 'fake')
-        self.values = {'name': 1, 'id': 1,
+        self.context = context.RequestContext('fake', 'fake', False)
+        self.values = {'id': 1,
                   'project_id': self.project.id,
                   'user_id': self.user.id,
                   'image_id': 1,
                   'kernel_id': None,
                   'ramdisk_id': None,
+                  'local_gb': 5,
                   'instance_type': 'm1.large',
                   'mac_address': 'aa:bb:cc:dd:ee:ff',
                   'os_type': 'linux'}
 
+        fake_utils.stub_out_utils_execute(self.stubs)
         stubs.stub_out_migration_methods(self.stubs)
+        stubs.stubout_get_this_vm_uuid(self.stubs)
         glance_stubs.stubout_glance_client(self.stubs,
                                            glance_stubs.FakeGlance)
 
@@ -472,14 +584,15 @@ class XenAPIMigrateInstance(test.TestCase):
         self.stubs.UnsetAll()
 
     def test_migrate_disk_and_power_off(self):
-        instance = db.instance_create(self.values)
+        instance = db.instance_create(self.context, self.values)
         stubs.stubout_session(self.stubs, stubs.FakeSessionForMigrationTests)
         conn = xenapi_conn.get_connection(False)
         conn.migrate_disk_and_power_off(instance, '127.0.0.1')
 
     def test_finish_resize(self):
-        instance = db.instance_create(self.values)
+        instance = db.instance_create(self.context, self.values)
         stubs.stubout_session(self.stubs, stubs.FakeSessionForMigrationTests)
+        stubs.stubout_loopingcall_start(self.stubs)
         conn = xenapi_conn.get_connection(False)
         conn.finish_resize(instance, dict(base_copy='hurr', cow='durr'))
 
diff --git a/nova/tests/xenapi/stubs.py b/nova/tests/xenapi/stubs.py
index 7c33710c0..205f6c902 100644
--- a/nova/tests/xenapi/stubs.py
+++ b/nova/tests/xenapi/stubs.py
@@ -21,6 +21,7 @@ from nova.virt.xenapi import fake
 from nova.virt.xenapi import volume_utils
 from nova.virt.xenapi import vm_utils
 from nova.virt.xenapi import vmops
+from nova import utils
 
 
 def stubout_instance_snapshot(stubs):
@@ -137,14 +138,17 @@ def stubout_is_vdi_pv(stubs):
     stubs.Set(vm_utils, '_is_vdi_pv', f)
 
 
+def stubout_loopingcall_start(stubs):
+    def fake_start(self, interval, now=True):
+        self.f(*self.args, **self.kw)
+    stubs.Set(utils.LoopingCall, 'start', fake_start)
+
+
 class FakeSessionForVMTests(fake.SessionBase):
     """ Stubs out a XenAPISession for VM tests """
     def __init__(self, uri):
         super(FakeSessionForVMTests, self).__init__(uri)
 
-    def network_get_all_records_where(self, _1, _2):
-        return self.xenapi.network.get_all_records()
-
     def host_call_plugin(self, _1, _2, _3, _4, _5):
         sr_ref = fake.get_all('SR')[0]
         vdi_ref = fake.create_vdi('', False, sr_ref, False)
@@ -196,7 +200,7 @@ def stub_out_vm_methods(stubs):
         pass
 
     def fake_spawn_rescue(self, inst):
-        pass
+        inst._rescue = False
 
     stubs.Set(vmops.VMOps, "_shutdown", fake_shutdown)
     stubs.Set(vmops.VMOps, "_acquire_bootlock", fake_acquire_bootlock)