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# 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 codecs
import fixtures
import json
import logging
import os
from stevedore import extension
from testtools.matchers import FileExists
import diskimage_builder.block_device.blockdevice as bd
import diskimage_builder.block_device.tests.test_base as tb
from diskimage_builder.block_device.exception import \
BlockDeviceSetupException
logger = logging.getLogger(__name__)
class TestStateBase(tb.TestBase):
def setUp(self):
super(TestStateBase, self).setUp()
# override the extensions to the test extensions
test_extensions = extension.ExtensionManager(
namespace='diskimage_builder.block_device.plugin_test',
invoke_on_load=False)
extensions_fixture = fixtures.MonkeyPatch(
'diskimage_builder.block_device.config._extensions',
test_extensions)
self.useFixture(extensions_fixture)
# status and other bits saved here
self.build_dir = fixtures.TempDir()
self.useFixture(self.build_dir)
class TestState(TestStateBase):
# The the state generation & saving methods
def test_state_create(self):
params = {
'build-dir': self.build_dir.path,
'config': self.get_config_file('cmd_create.yaml')
}
bd_obj = bd.BlockDevice(params)
bd_obj.cmd_init()
bd_obj.cmd_create()
# cmd_create should have persisted this to disk
state_file = bd_obj.state_json_file_name
self.assertThat(state_file, FileExists())
# ensure we see the values put in by the test extensions
# persisted
with codecs.open(state_file, encoding='utf-8', mode='r') as fd:
state = json.load(fd)
self.assertDictEqual(state,
{'test_a': {'value': 'foo',
'value2': 'bar'},
'test_b': {'value': 'baz'},
'test_init_state': 'here'})
pickle_file = bd_obj.node_pickle_file_name
self.assertThat(pickle_file, FileExists())
# run umount, which should load the picked nodes and run in
# reverse. This will create some state in "test_b" that it
# added to by "test_a" ... ensuring it was run backwards. It
# also checks the state was persisted through the pickling
# process.
bd_obj.cmd_umount()
# Test state going missing between phases
def test_missing_state(self):
params = {
'build-dir': self.build_dir.path,
'config': self.get_config_file('cmd_create.yaml')
}
bd_obj = bd.BlockDevice(params)
bd_obj.cmd_init()
bd_obj.cmd_create()
# cmd_create should have persisted this to disk
state_file = bd_obj.state_json_file_name
self.assertThat(state_file, FileExists())
pickle_file = bd_obj.node_pickle_file_name
self.assertThat(pickle_file, FileExists())
# simulate the state somehow going missing, and ensure that
# later calls notice
os.unlink(state_file)
os.unlink(pickle_file)
# This reads from the state dump json file
self.assertRaisesRegex(BlockDeviceSetupException,
"State dump not found",
bd_obj.cmd_getval, 'image-path')
self.assertRaisesRegex(BlockDeviceSetupException,
"State dump not found",
bd_obj.cmd_writefstab)
# this uses the pickled nodes
self.assertRaisesRegex(BlockDeviceSetupException,
"Pickle file not found",
bd_obj.cmd_delete)
self.assertRaisesRegex(BlockDeviceSetupException,
"Pickle file not found",
bd_obj.cmd_cleanup)
# XXX: figure out unit test for umount
# Test ordering of rollback calls if create() fails
def test_rollback(self):
params = {
'build-dir': self.build_dir.path,
'config': self.get_config_file('rollback.yaml'),
'test_rollback': True
}
bd_obj = bd.BlockDevice(params)
bd_obj.cmd_init()
# The config file has flags in that tell the last node to
# fail, which will trigger the rollback.
self.assertRaises(RuntimeError, bd_obj.cmd_create)
# cmd_create should have persisted this to disk even after the
# failure
state_file = bd_obj.state_json_file_name
self.assertThat(state_file, FileExists())
with codecs.open(state_file, encoding='utf-8', mode='r') as fd:
state = json.load(fd)
# ensure the rollback was called in order
self.assertListEqual(state['rollback_test'],
['never', 'gonna', 'give', 'you', 'up',
'never', 'gonna', 'let', 'you', 'down'])
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