298 lines
12 KiB
Python
298 lines
12 KiB
Python
# Copyright 2014 Cloudbase Solutions Srl
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import copy
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import os
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import mock
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from cinder import exception
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from cinder import test
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from cinder.volume.drivers import remotefs
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class RemoteFsSnapDriverTestCase(test.TestCase):
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_FAKE_CONTEXT = 'fake_context'
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_FAKE_VOLUME_NAME = 'volume-4f711859-4928-4cb7-801a-a50c37ceaccc'
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_FAKE_VOLUME = {'id': '4f711859-4928-4cb7-801a-a50c37ceaccc',
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'size': 1,
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'provider_location': 'fake_share',
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'name': _FAKE_VOLUME_NAME,
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'status': 'available'}
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_FAKE_MNT_POINT = '/mnt/fake_hash'
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_FAKE_VOLUME_PATH = os.path.join(_FAKE_MNT_POINT,
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_FAKE_VOLUME_NAME)
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_FAKE_SNAPSHOT_ID = '5g811859-4928-4cb7-801a-a50c37ceacba'
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_FAKE_SNAPSHOT = {'context': _FAKE_CONTEXT,
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'id': _FAKE_SNAPSHOT_ID,
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'volume': _FAKE_VOLUME,
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'status': 'available',
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'volume_size': 1}
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_FAKE_SNAPSHOT_PATH = (_FAKE_VOLUME_PATH + '.' + _FAKE_SNAPSHOT_ID)
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def setUp(self):
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super(RemoteFsSnapDriverTestCase, self).setUp()
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self._driver = remotefs.RemoteFSSnapDriver()
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self._driver._remotefsclient = mock.Mock()
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self._driver._execute = mock.Mock()
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self._driver._delete = mock.Mock()
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def _test_delete_snapshot(self, volume_in_use=False,
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stale_snapshot=False,
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is_active_image=True,
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highest_file_exists=False):
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# If the snapshot is not the active image, it is guaranteed that
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# another snapshot exists having it as backing file.
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# If yet another file is backed by the file from the next level,
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# it means that the 'highest file' exists and it needs to be rebased.
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fake_snapshot_name = os.path.basename(self._FAKE_SNAPSHOT_PATH)
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fake_info = {'active': fake_snapshot_name,
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self._FAKE_SNAPSHOT['id']: fake_snapshot_name}
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fake_snap_img_info = mock.Mock()
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fake_base_img_info = mock.Mock()
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if stale_snapshot:
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fake_snap_img_info.backing_file = None
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else:
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fake_snap_img_info.backing_file = self._FAKE_VOLUME_NAME
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fake_snap_img_info.file_format = 'qcow2'
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fake_base_img_info.backing_file = None
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self._driver._local_path_volume_info = mock.Mock(
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return_value=mock.sentinel.fake_info_path)
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self._driver._qemu_img_info = mock.Mock(
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side_effect=[fake_snap_img_info, fake_base_img_info])
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self._driver._local_volume_dir = mock.Mock(
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return_value=self._FAKE_MNT_POINT)
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self._driver._read_info_file = mock.Mock()
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self._driver._write_info_file = mock.Mock()
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self._driver._img_commit = mock.Mock()
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self._driver._rebase_img = mock.Mock()
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self._driver._ensure_share_writable = mock.Mock()
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self._driver._delete_stale_snapshot = mock.Mock()
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self._driver._delete_snapshot_online = mock.Mock()
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expected_info = {
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'active': fake_snapshot_name,
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self._FAKE_SNAPSHOT_ID: fake_snapshot_name
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}
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if volume_in_use:
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fake_snapshot = copy.deepcopy(self._FAKE_SNAPSHOT)
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fake_snapshot['volume']['status'] = 'in-use'
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self._driver._read_info_file.return_value = fake_info
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self._driver._delete_snapshot(fake_snapshot)
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if stale_snapshot:
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self._driver._delete_stale_snapshot.assert_called_once_with(
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fake_snapshot)
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else:
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expected_online_delete_info = {
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'active_file': fake_snapshot_name,
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'snapshot_file': fake_snapshot_name,
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'base_file': self._FAKE_VOLUME_NAME,
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'base_id': None,
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'new_base_file': None
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}
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self._driver._delete_snapshot_online.assert_called_once_with(
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self._FAKE_CONTEXT, fake_snapshot,
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expected_online_delete_info)
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elif is_active_image:
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self._driver._read_info_file.return_value = fake_info
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self._driver._delete_snapshot(self._FAKE_SNAPSHOT)
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self._driver._img_commit.assert_called_once_with(
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self._FAKE_SNAPSHOT_PATH)
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self._driver._write_info_file.assert_called_once_with(
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mock.sentinel.fake_info_path, fake_info)
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else:
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fake_upper_snap_id = 'fake_upper_snap_id'
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fake_upper_snap_path = (
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self._FAKE_VOLUME_PATH + '-snapshot' + fake_upper_snap_id)
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fake_upper_snap_name = os.path.basename(fake_upper_snap_path)
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fake_backing_chain = [
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{'filename': fake_upper_snap_name,
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'backing-filename': fake_snapshot_name},
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{'filename': fake_snapshot_name,
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'backing-filename': self._FAKE_VOLUME_NAME},
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{'filename': self._FAKE_VOLUME_NAME,
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'backing-filename': None}]
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fake_info[fake_upper_snap_id] = fake_upper_snap_name
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fake_info[self._FAKE_SNAPSHOT_ID] = fake_snapshot_name
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if highest_file_exists:
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fake_highest_snap_id = 'fake_highest_snap_id'
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fake_highest_snap_path = (
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self._FAKE_VOLUME_PATH + '-snapshot' +
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fake_highest_snap_id)
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fake_highest_snap_name = os.path.basename(
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fake_highest_snap_path)
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fake_highest_snap_info = {
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'filename': fake_highest_snap_name,
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'backing-filename': fake_upper_snap_name,
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}
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fake_backing_chain.insert(0, fake_highest_snap_info)
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fake_info['active'] = fake_highest_snap_name
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fake_info[fake_highest_snap_id] = fake_highest_snap_name
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else:
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fake_info['active'] = fake_upper_snap_name
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expected_info = copy.deepcopy(fake_info)
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expected_info[fake_upper_snap_id] = fake_snapshot_name
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del expected_info[self._FAKE_SNAPSHOT_ID]
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if not highest_file_exists:
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expected_info['active'] = fake_snapshot_name
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self._driver._read_info_file.return_value = fake_info
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self._driver._get_backing_chain_for_path = mock.Mock(
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return_value=fake_backing_chain)
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self._driver._delete_snapshot(self._FAKE_SNAPSHOT)
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self._driver._img_commit.assert_any_call(
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fake_upper_snap_path)
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if highest_file_exists:
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self._driver._rebase_img.assert_called_once_with(
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fake_highest_snap_path, fake_snapshot_name, 'qcow2')
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self._driver._write_info_file.assert_called_once_with(
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mock.sentinel.fake_info_path, expected_info)
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def test_delete_snapshot_when_active_file(self):
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self._test_delete_snapshot()
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def test_delete_snapshot_in_use(self):
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self._test_delete_snapshot(volume_in_use=True)
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def test_delete_snapshot_in_use_stale_snapshot(self):
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self._test_delete_snapshot(volume_in_use=True,
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stale_snapshot=True)
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def test_delete_snapshot_with_one_upper_file(self):
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self._test_delete_snapshot(is_active_image=False)
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def test_delete_snapshot_with_two_or_more_upper_files(self):
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self._test_delete_snapshot(is_active_image=False,
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highest_file_exists=True)
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def test_delete_stale_snapshot(self):
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fake_snapshot_name = os.path.basename(self._FAKE_SNAPSHOT_PATH)
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fake_snap_info = {
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'active': self._FAKE_VOLUME_NAME,
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self._FAKE_SNAPSHOT_ID: fake_snapshot_name
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}
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expected_info = {'active': self._FAKE_VOLUME_NAME}
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self._driver._local_path_volume_info = mock.Mock(
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return_value=mock.sentinel.fake_info_path)
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self._driver._read_info_file = mock.Mock(
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return_value=fake_snap_info)
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self._driver._local_volume_dir = mock.Mock(
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return_value=self._FAKE_MNT_POINT)
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self._driver._write_info_file = mock.Mock()
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self._driver._delete_stale_snapshot(self._FAKE_SNAPSHOT)
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self._driver._delete.assert_called_once_with(self._FAKE_SNAPSHOT_PATH)
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self._driver._write_info_file.assert_called_once_with(
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mock.sentinel.fake_info_path, expected_info)
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def test_do_create_snapshot(self):
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self._driver._local_volume_dir = mock.Mock(
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return_value=self._FAKE_VOLUME_PATH)
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fake_backing_path = os.path.join(
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self._driver._local_volume_dir(),
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self._FAKE_VOLUME_NAME)
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self._driver._execute = mock.Mock()
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self._driver._set_rw_permissions = mock.Mock()
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self._driver._qemu_img_info = mock.Mock(
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return_value=mock.Mock(file_format=mock.sentinel.backing_fmt))
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self._driver._do_create_snapshot(self._FAKE_SNAPSHOT,
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self._FAKE_VOLUME_NAME,
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self._FAKE_SNAPSHOT_PATH)
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command1 = ['qemu-img', 'create', '-f', 'qcow2', '-o',
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'backing_file=%s' % fake_backing_path,
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self._FAKE_SNAPSHOT_PATH]
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command2 = ['qemu-img', 'rebase', '-u',
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'-b', self._FAKE_VOLUME_NAME,
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'-F', mock.sentinel.backing_fmt,
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self._FAKE_SNAPSHOT_PATH]
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self._driver._execute.assert_any_call(*command1, run_as_root=True)
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self._driver._execute.assert_any_call(*command2, run_as_root=True)
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def _test_create_snapshot(self, volume_in_use=False):
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fake_snapshot = copy.deepcopy(self._FAKE_SNAPSHOT)
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fake_snapshot_info = {}
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fake_snapshot_file_name = os.path.basename(self._FAKE_SNAPSHOT_PATH)
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self._driver._local_path_volume_info = mock.Mock(
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return_value=mock.sentinel.fake_info_path)
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self._driver._read_info_file = mock.Mock(
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return_value=fake_snapshot_info)
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self._driver._do_create_snapshot = mock.Mock()
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self._driver._create_snapshot_online = mock.Mock()
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self._driver._write_info_file = mock.Mock()
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self._driver.get_active_image_from_info = mock.Mock(
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return_value=self._FAKE_VOLUME_NAME)
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self._driver._get_new_snap_path = mock.Mock(
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return_value=self._FAKE_SNAPSHOT_PATH)
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expected_snapshot_info = {
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'active': fake_snapshot_file_name,
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self._FAKE_SNAPSHOT_ID: fake_snapshot_file_name
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}
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if volume_in_use:
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fake_snapshot['volume']['status'] = 'in-use'
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expected_method_called = '_create_snapshot_online'
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else:
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fake_snapshot['volume']['status'] = 'available'
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expected_method_called = '_do_create_snapshot'
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self._driver._create_snapshot(fake_snapshot)
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fake_method = getattr(self._driver, expected_method_called)
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fake_method.assert_called_with(
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fake_snapshot, self._FAKE_VOLUME_NAME,
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self._FAKE_SNAPSHOT_PATH)
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self._driver._write_info_file.assert_called_with(
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mock.sentinel.fake_info_path,
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expected_snapshot_info)
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def test_create_snapshot_volume_available(self):
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self._test_create_snapshot()
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def test_create_snapshot_volume_in_use(self):
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self._test_create_snapshot(volume_in_use=True)
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def test_create_snapshot_invalid_volume(self):
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fake_snapshot = copy.deepcopy(self._FAKE_SNAPSHOT)
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fake_snapshot['volume']['status'] = 'error'
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self.assertRaises(exception.InvalidVolume,
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self._driver._create_snapshot,
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fake_snapshot)
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