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# Copyright 2022 Red Hat, 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.
import os
from unittest import mock
import uuid
import fixtures
from oslo_config import cfg
from oslo_utils.fixture import uuidsentinel as uuids
import testtools
from nova import exception
from nova import test
from nova.tests import fixtures as nova_fixtures
from nova.virt import node
CONF = cfg.CONF
# NOTE(danms): We do not inherit from test.TestCase because we need
# our node methods not stubbed out in order to exercise them.
class TestNodeIdentity(testtools.TestCase):
def flags(self, **kw):
"""Override flag variables for a test."""
group = kw.pop('group', None)
for k, v in kw.items():
CONF.set_override(k, v, group)
def setUp(self):
super().setUp()
self.useFixture(nova_fixtures.ConfFixture(CONF))
self.tempdir = self.useFixture(fixtures.TempDir()).path
self.identity_file = os.path.join(self.tempdir, node.COMPUTE_ID_FILE)
self.fake_config_files = ['%s/etc/nova.conf' % self.tempdir,
'%s/etc/nova/nova.conf' % self.tempdir,
'%s/opt/etc/nova/nova.conf' % self.tempdir]
for fn in self.fake_config_files:
os.makedirs(os.path.dirname(fn))
self.flags(state_path=self.tempdir,
config_file=self.fake_config_files)
node.LOCAL_NODE_UUID = None
def test_generate_local_node_uuid(self):
node_uuid = uuids.node
node.write_local_node_uuid(node_uuid)
e = self.assertRaises(exception.InvalidNodeConfiguration,
node.write_local_node_uuid, 'anything')
self.assertIn(
'Identity file %s appeared unexpectedly' % self.identity_file,
str(e))
def test_generate_local_node_uuid_unexpected_open_fail(self):
with mock.patch('builtins.open') as mock_open:
mock_open.side_effect = IndexError()
e = self.assertRaises(exception.InvalidNodeConfiguration,
node.write_local_node_uuid, 'foo')
self.assertIn('Unable to write uuid to %s' % (
self.identity_file), str(e))
def test_generate_local_node_uuid_unexpected_write_fail(self):
with mock.patch('builtins.open') as mock_open:
mock_write = mock_open.return_value.__enter__.return_value.write
mock_write.side_effect = IndexError()
e = self.assertRaises(exception.InvalidNodeConfiguration,
node.write_local_node_uuid, 'foo')
self.assertIn('Unable to write uuid to %s' % (
self.identity_file), str(e))
def test_get_local_node_uuid_simple_exists(self):
node_uuid = uuids.node
with test.patch_open('%s/etc/nova/compute_id' % self.tempdir,
node_uuid):
self.assertEqual(node_uuid, node.get_local_node_uuid())
def test_get_local_node_uuid_simple_exists_whitespace(self):
node_uuid = uuids.node
# Make sure we strip whitespace from the file contents
with test.patch_open('%s/etc/nova/compute_id' % self.tempdir,
' %s \n' % node_uuid):
self.assertEqual(node_uuid, node.get_local_node_uuid())
def test_get_local_node_uuid_simple_generate(self):
self.assertIsNone(node.LOCAL_NODE_UUID)
node_uuid1 = node.get_local_node_uuid()
self.assertEqual(node_uuid1, node.LOCAL_NODE_UUID)
node_uuid2 = node.get_local_node_uuid()
self.assertEqual(node_uuid2, node.LOCAL_NODE_UUID)
# Make sure we got the same thing each time, and that it's a
# valid uuid. Since we provided no uuid, it must have been
# generated the first time and read/returned the second.
self.assertEqual(node_uuid1, node_uuid2)
uuid.UUID(node_uuid1)
# Try to read it directly to make sure the file was really
# created and with the right value.
self.assertEqual(node_uuid1, node.read_local_node_uuid())
def test_get_local_node_uuid_two(self):
node_uuid = uuids.node
# Write the uuid to two of our locations
for cf in (self.fake_config_files[0], self.fake_config_files[1]):
open(os.path.join(os.path.dirname(cf),
node.COMPUTE_ID_FILE), 'w').write(node_uuid)
# Make sure we got the expected uuid and that no exceptions
# were raised about the files disagreeing
self.assertEqual(node_uuid, node.get_local_node_uuid())
def test_get_local_node_uuid_two_mismatch(self):
node_uuids = [uuids.node1, uuids.node2]
# Write a different uuid to each file
for id, fn in zip(node_uuids, self.fake_config_files):
open(os.path.join(
os.path.dirname(fn),
node.COMPUTE_ID_FILE), 'w').write(id)
# Make sure we get an error that identifies the mismatching
# file with its uuid, as well as what we expected to find
e = self.assertRaises(exception.InvalidNodeConfiguration,
node.get_local_node_uuid)
expected = ('UUID %s in %s does not match %s' % (
node_uuids[1],
os.path.join(os.path.dirname(self.fake_config_files[1]),
'compute_id'),
node_uuids[0]))
self.assertIn(expected, str(e))
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