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test_imagebackend.py
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test_imagebackend.py
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# Copyright 2012 Grid Dynamics
# 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.
import base64
import os
import shutil
import tempfile
from castellan import key_manager
import fixtures
import mock
from oslo_concurrency import lockutils
from oslo_config import fixture as config_fixture
from oslo_utils import imageutils
from oslo_utils import units
from oslo_utils import uuidutils
from nova.compute import utils as compute_utils
import nova.conf
from nova import context
from nova import exception
from nova import objects
from nova import test
from nova.tests.unit import fake_processutils
from nova.tests.unit.virt.libvirt import fake_libvirt_utils
from nova import utils
from nova.virt.image import model as imgmodel
from nova.virt import images
from nova.virt.libvirt import config as vconfig
from nova.virt.libvirt import imagebackend
from nova.virt.libvirt.storage import rbd_utils
CONF = nova.conf.CONF
class FakeSecret(object):
def value(self):
return base64.b64decode("MTIzNDU2Cg==")
class FakeConn(object):
def secretLookupByUUIDString(self, uuid):
return FakeSecret()
class _ImageTestCase(object):
def mock_create_image(self, image):
def create_image(fn, base, size, *args, **kwargs):
fn(target=base, *args, **kwargs)
image.create_image = create_image
def setUp(self):
super(_ImageTestCase, self).setUp()
self.fixture = self.useFixture(config_fixture.Config(lockutils.CONF))
self.INSTANCES_PATH = tempfile.mkdtemp(suffix='instances')
self.fixture.config(disable_process_locking=True,
group='oslo_concurrency')
self.flags(instances_path=self.INSTANCES_PATH)
self.INSTANCE = objects.Instance(id=1, uuid=uuidutils.generate_uuid())
self.DISK_INFO_PATH = os.path.join(self.INSTANCES_PATH,
self.INSTANCE['uuid'], 'disk.info')
self.NAME = 'fake.vm'
self.TEMPLATE = 'template'
self.CONTEXT = context.get_admin_context()
self.PATH = os.path.join(
fake_libvirt_utils.get_instance_path(self.INSTANCE), self.NAME)
# TODO(mikal): rename template_dir to base_dir and template_path
# to cached_image_path. This will be less confusing.
self.TEMPLATE_DIR = os.path.join(CONF.instances_path, '_base')
self.TEMPLATE_PATH = os.path.join(self.TEMPLATE_DIR, 'template')
# Ensure can_fallocate is not initialised on the class
if hasattr(self.image_class, 'can_fallocate'):
del self.image_class.can_fallocate
self.useFixture(fixtures.MonkeyPatch(
'nova.virt.libvirt.imagebackend.libvirt_utils',
fake_libvirt_utils))
# This will be used to mock some decorations like utils.synchronize
def _fake_deco(func):
return func
self._fake_deco = _fake_deco
def tearDown(self):
super(_ImageTestCase, self).tearDown()
shutil.rmtree(self.INSTANCES_PATH)
def test_prealloc_image(self):
CONF.set_override('preallocate_images', 'space')
fake_processutils.fake_execute_clear_log()
fake_processutils.stub_out_processutils_execute(self)
image = self.image_class(self.INSTANCE, self.NAME)
def fake_fetch(target, *args, **kwargs):
return
self.stub_out('os.path.exists', lambda _: True)
self.stub_out('os.access', lambda p, w: True)
with mock.patch.object(image, 'get_disk_size', return_value=self.SIZE):
# Call twice to verify testing fallocate is only called once.
image.cache(fake_fetch, self.TEMPLATE_PATH, self.SIZE)
image.cache(fake_fetch, self.TEMPLATE_PATH, self.SIZE)
self.assertEqual(fake_processutils.fake_execute_get_log(),
['fallocate -l 1 %s.fallocate_test' % self.PATH,
'fallocate -n -l %s %s' % (self.SIZE, self.PATH),
'fallocate -n -l %s %s' % (self.SIZE, self.PATH)])
def test_prealloc_image_without_write_access(self):
CONF.set_override('preallocate_images', 'space')
fake_processutils.fake_execute_clear_log()
fake_processutils.stub_out_processutils_execute(self)
image = self.image_class(self.INSTANCE, self.NAME)
def fake_fetch(target, *args, **kwargs):
return
with test.nested(
mock.patch.object(image, 'exists', lambda: True),
mock.patch.object(image, '_can_fallocate', lambda: True),
mock.patch.object(image, 'get_disk_size', lambda _: self.SIZE)
) as (mock_exists, mock_can, mock_get):
self.stub_out('os.path.exists', lambda _: True)
self.stub_out('os.access', lambda p, w: False)
# Testing fallocate is only called when user has write access.
image.cache(fake_fetch, self.TEMPLATE_PATH, self.SIZE)
self.assertEqual(fake_processutils.fake_execute_get_log(), [])
def test_libvirt_fs_info(self):
image = self.image_class(self.INSTANCE, self.NAME)
fs = image.libvirt_fs_info("/mnt")
# check that exception hasn't been raised and the method
# returned correct object
self.assertIsInstance(fs, vconfig.LibvirtConfigGuestFilesys)
self.assertEqual(fs.target_dir, "/mnt")
if image.is_block_dev:
self.assertEqual(fs.source_type, "block")
self.assertEqual(fs.source_dev, image.path)
else:
self.assertEqual(fs.source_type, "file")
self.assertEqual(fs.source_file, image.path)
def test_libvirt_info(self):
image = self.image_class(self.INSTANCE, self.NAME)
extra_specs = {
'quota:disk_read_bytes_sec': 10 * units.Mi,
'quota:disk_read_iops_sec': 1 * units.Ki,
'quota:disk_write_bytes_sec': 20 * units.Mi,
'quota:disk_write_iops_sec': 2 * units.Ki,
'quota:disk_total_bytes_sec': 30 * units.Mi,
'quota:disk_total_iops_sec': 3 * units.Ki,
}
disk_info = {
'bus': 'virtio',
'dev': '/dev/vda',
'type': 'cdrom',
}
disk = image.libvirt_info(disk_info,
cache_mode="none",
extra_specs=extra_specs,
hypervisor_version=4004001,
boot_order="1")
self.assertIsInstance(disk, vconfig.LibvirtConfigGuestDisk)
self.assertEqual("/dev/vda", disk.target_dev)
self.assertEqual("virtio", disk.target_bus)
self.assertEqual("none", disk.driver_cache)
self.assertEqual("cdrom", disk.source_device)
self.assertEqual("1", disk.boot_order)
self.assertEqual(10 * units.Mi, disk.disk_read_bytes_sec)
self.assertEqual(1 * units.Ki, disk.disk_read_iops_sec)
self.assertEqual(20 * units.Mi, disk.disk_write_bytes_sec)
self.assertEqual(2 * units.Ki, disk.disk_write_iops_sec)
self.assertEqual(30 * units.Mi, disk.disk_total_bytes_sec)
self.assertEqual(3 * units.Ki, disk.disk_total_iops_sec)
@mock.patch('nova.virt.disk.api.get_disk_size')
def test_get_disk_size(self, get_disk_size):
get_disk_size.return_value = 2361393152
image = self.image_class(self.INSTANCE, self.NAME)
self.assertEqual(2361393152, image.get_disk_size(image.path))
get_disk_size.assert_called_once_with(image.path)
class FlatTestCase(_ImageTestCase, test.NoDBTestCase):
SIZE = 1024
def setUp(self):
self.image_class = imagebackend.Flat
super(FlatTestCase, self).setUp()
@mock.patch.object(imagebackend.fileutils, 'ensure_tree')
@mock.patch.object(os.path, 'exists')
def test_cache(self, mock_exists, mock_ensure):
self.stub_out('nova.virt.libvirt.imagebackend.Flat.correct_format',
lambda _: None)
mock_exists.side_effect = [False, False, False]
exist_calls = [mock.call(self.TEMPLATE_DIR),
mock.call(self.PATH), mock.call(self.TEMPLATE_PATH)]
fn = mock.MagicMock()
fn(target=self.TEMPLATE_PATH)
image = self.image_class(self.INSTANCE, self.NAME)
self.mock_create_image(image)
image.cache(fn, self.TEMPLATE)
mock_ensure.assert_called_once_with(self.TEMPLATE_DIR)
mock_exists.assert_has_calls(exist_calls)
@mock.patch.object(os.path, 'exists')
def test_cache_image_exists(self, mock_exists):
self.stub_out('nova.virt.libvirt.imagebackend.Flat.correct_format',
lambda _: None)
mock_exists.side_effect = [True, True, True]
exist_calls = [mock.call(self.TEMPLATE_DIR),
mock.call(self.PATH), mock.call(self.TEMPLATE_PATH)]
image = self.image_class(self.INSTANCE, self.NAME)
image.cache(None, self.TEMPLATE)
mock_exists.assert_has_calls(exist_calls)
@mock.patch.object(os.path, 'exists')
def test_cache_base_dir_exists(self, mock_exists):
self.stub_out('nova.virt.libvirt.imagebackend.Flat.correct_format',
lambda _: None)
mock_exists.side_effect = [True, False, False]
exist_calls = [mock.call(self.TEMPLATE_DIR),
mock.call(self.PATH), mock.call(self.TEMPLATE_PATH)]
fn = mock.MagicMock()
fn(target=self.TEMPLATE_PATH)
image = self.image_class(self.INSTANCE, self.NAME)
self.mock_create_image(image)
image.cache(fn, self.TEMPLATE)
mock_exists.assert_has_calls(exist_calls)
@mock.patch.object(os.path, 'exists')
def test_cache_template_exists(self, mock_exists):
self.stub_out('nova.virt.libvirt.imagebackend.Flat.correct_format',
lambda _: None)
mock_exists.side_effect = [True, False, True]
exist_calls = [mock.call(self.TEMPLATE_DIR),
mock.call(self.PATH), mock.call(self.TEMPLATE_PATH)]
image = self.image_class(self.INSTANCE, self.NAME)
self.mock_create_image(image)
image.cache(None, self.TEMPLATE)
mock_exists.assert_has_calls(exist_calls)
@mock.patch('os.path.exists')
def test_cache_generating_resize(self, mock_path_exists):
# Test for bug 1608934
# The Flat backend doesn't write to the image cache when creating a
# non-image backend. Test that we don't try to get the disk size of
# a non-existent backend.
base_dir = os.path.join(CONF.instances_path,
CONF.image_cache_subdirectory_name)
# Lets assume the base image cache directory already exists
existing = set([base_dir])
def fake_exists(path):
# Return True only for files previously created during
# execution. This allows us to test that we're not calling
# get_disk_size() on something which hasn't been previously
# created.
return path in existing
def fake_get_disk_size(path):
# get_disk_size will explode if called on a path which doesn't
# exist. Specific exception not important for this test.
if path not in existing:
raise AssertionError
# Not important, won't actually be called by patched code.
return 2 * units.Gi
def fake_template(target=None, **kwargs):
# The template function we pass to cache. Calling this will
# cause target to be created.
existing.add(target)
mock_path_exists.side_effect = fake_exists
image = self.image_class(self.INSTANCE, self.NAME)
# We're not testing preallocation
image.preallocate = False
with test.nested(
mock.patch.object(image, 'exists'),
mock.patch.object(image, 'correct_format'),
mock.patch.object(image, 'get_disk_size'),
mock.patch.object(image, 'resize_image')
) as (
mock_disk_exists, mock_correct_format, mock_get_disk_size,
mock_resize_image
):
# Assume the disk doesn't already exist
mock_disk_exists.return_value = False
# This won't actually be executed since change I46b5658e,
# but this is how the unpatched code will fail. We include this
# here as a belt-and-braces sentinel.
mock_get_disk_size.side_effect = fake_get_disk_size
# Try to create a 2G image
image.cache(fake_template, 'fake_cache_name', 2 * units.Gi)
# The real assertion is that the above call to cache() didn't
# raise AssertionError which, if we get here, it clearly didn't.
self.assertFalse(image.resize_image.called)
@mock.patch.object(imagebackend.disk, 'extend')
@mock.patch.object(fake_libvirt_utils, 'copy_image')
@mock.patch.object(imagebackend.utils, 'synchronized')
@mock.patch('nova.privsep.path.utime')
def test_create_image(self, mock_utime, mock_sync, mock_copy, mock_extend):
mock_sync.side_effect = lambda *a, **kw: self._fake_deco
fn = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH, None, image_id=None)
mock_copy.assert_called_once_with(self.TEMPLATE_PATH, self.PATH)
fn.assert_called_once_with(target=self.TEMPLATE_PATH, image_id=None)
self.assertTrue(mock_sync.called)
self.assertFalse(mock_extend.called)
mock_utime.assert_called()
@mock.patch.object(imagebackend.disk, 'extend')
@mock.patch.object(fake_libvirt_utils, 'copy_image')
@mock.patch.object(imagebackend.utils, 'synchronized')
def test_create_image_generated(self, mock_sync, mock_copy, mock_extend):
mock_sync.side_effect = lambda *a, **kw: self._fake_deco
fn = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH, None)
fn.assert_called_once_with(target=self.PATH)
self.assertFalse(mock_copy.called)
self.assertTrue(mock_sync.called)
self.assertFalse(mock_extend.called)
@mock.patch.object(imagebackend.disk, 'extend')
@mock.patch.object(fake_libvirt_utils, 'copy_image')
@mock.patch.object(imagebackend.utils, 'synchronized')
@mock.patch.object(images, 'qemu_img_info',
return_value=imageutils.QemuImgInfo())
@mock.patch('nova.privsep.path.utime')
def test_create_image_extend(self, mock_utime, mock_qemu, mock_sync,
mock_copy, mock_extend):
mock_sync.side_effect = lambda *a, **kw: self._fake_deco
fn = mock.MagicMock()
mock_qemu.return_value.virtual_size = 1024
fn(target=self.TEMPLATE_PATH, image_id=None)
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH,
self.SIZE, image_id=None)
mock_copy.assert_called_once_with(self.TEMPLATE_PATH, self.PATH)
self.assertTrue(mock_sync.called)
mock_extend.assert_called_once_with(
imgmodel.LocalFileImage(self.PATH, imgmodel.FORMAT_RAW),
self.SIZE)
mock_qemu.assert_called_once_with(self.TEMPLATE_PATH)
mock_utime.assert_called()
@mock.patch.object(os.path, 'exists')
@mock.patch.object(imagebackend.images, 'qemu_img_info')
def test_correct_format(self, mock_qemu, mock_exist):
mock_exist.side_effect = [True, False, True]
info = mock.MagicMock()
info.file_format = 'foo'
mock_qemu.return_value = info
image = self.image_class(self.INSTANCE, self.NAME, path=self.PATH)
self.assertEqual(image.driver_format, 'foo')
mock_qemu.assert_called_once_with(self.PATH)
mock_exist.assert_has_calls([mock.call(self.PATH),
mock.call(self.DISK_INFO_PATH),
mock.call(CONF.instances_path)])
@mock.patch.object(images, 'qemu_img_info',
side_effect=exception.InvalidDiskInfo(
reason='invalid path'))
def test_resolve_driver_format(self, fake_qemu_img_info):
image = self.image_class(self.INSTANCE, self.NAME)
driver_format = image.resolve_driver_format()
self.assertEqual(driver_format, 'raw')
def test_get_model(self):
image = self.image_class(self.INSTANCE, self.NAME)
model = image.get_model(FakeConn())
self.assertEqual(imgmodel.LocalFileImage(self.PATH,
imgmodel.FORMAT_RAW),
model)
class Qcow2TestCase(_ImageTestCase, test.NoDBTestCase):
SIZE = units.Gi
def setUp(self):
self.image_class = imagebackend.Qcow2
super(Qcow2TestCase, self).setUp()
self.QCOW2_BASE = (self.TEMPLATE_PATH +
'_%d' % (self.SIZE / units.Gi))
@mock.patch.object(os.path, 'exists')
def test_cache(self, mock_exists):
mock_exists.side_effect = [False, True, False, True, False, False]
fn = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
self.mock_create_image(image)
exist_calls = [mock.call(self.DISK_INFO_PATH),
mock.call(CONF.instances_path),
mock.call(self.TEMPLATE_DIR),
mock.call(self.INSTANCES_PATH),
mock.call(self.PATH),
mock.call(self.TEMPLATE_PATH)]
image.cache(fn, self.TEMPLATE)
fn.assert_called_once_with(target=self.TEMPLATE_PATH)
mock_exists.assert_has_calls(exist_calls)
@mock.patch.object(os.path, 'exists')
def test_cache_image_exists(self, mock_exists):
mock_exists.side_effect = [False, True, True, True, True]
exist_calls = [mock.call(self.DISK_INFO_PATH),
mock.call(self.INSTANCES_PATH),
mock.call(self.TEMPLATE_DIR),
mock.call(self.PATH),
mock.call(self.TEMPLATE_PATH)]
image = self.image_class(self.INSTANCE, self.NAME)
image.cache(None, self.TEMPLATE)
mock_exists.assert_has_calls(exist_calls)
@mock.patch.object(os.path, 'exists')
def test_cache_base_dir_exists(self, mock_exists):
mock_exists.side_effect = [False, True, True, False, False]
exist_calls = [mock.call(self.DISK_INFO_PATH),
mock.call(self.INSTANCES_PATH),
mock.call(self.TEMPLATE_DIR),
mock.call(self.PATH),
mock.call(self.TEMPLATE_PATH)]
fn = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
self.mock_create_image(image)
image.cache(fn, self.TEMPLATE)
fn.assert_called_once_with(target=self.TEMPLATE_PATH)
mock_exists.assert_has_calls(exist_calls)
@mock.patch.object(os.path, 'exists')
def test_cache_template_exists(self, mock_exists):
mock_exists.side_effect = [False, True, True, False, True]
exist_calls = [mock.call(self.DISK_INFO_PATH),
mock.call(self.INSTANCES_PATH),
mock.call(self.TEMPLATE_DIR),
mock.call(self.PATH),
mock.call(self.TEMPLATE_PATH)]
image = self.image_class(self.INSTANCE, self.NAME)
self.mock_create_image(image)
image.cache(None, self.TEMPLATE)
mock_exists.assert_has_calls(exist_calls)
@mock.patch.object(imagebackend.utils, 'synchronized')
@mock.patch.object(fake_libvirt_utils, 'create_cow_image')
@mock.patch.object(imagebackend.disk, 'extend')
@mock.patch('nova.privsep.path.utime')
def test_create_image(self, mock_utime, mock_extend, mock_create,
mock_sync):
mock_sync.side_effect = lambda *a, **kw: self._fake_deco
fn = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH, None)
mock_create.assert_called_once_with(self.TEMPLATE_PATH, self.PATH)
fn.assert_called_once_with(target=self.TEMPLATE_PATH)
self.assertTrue(mock_sync.called)
self.assertFalse(mock_extend.called)
mock_utime.assert_called()
@mock.patch.object(imagebackend.utils, 'synchronized')
@mock.patch.object(fake_libvirt_utils, 'create_cow_image')
@mock.patch.object(imagebackend.disk, 'extend')
@mock.patch.object(os.path, 'exists', side_effect=[])
@mock.patch.object(imagebackend.Image, 'verify_base_size')
@mock.patch('nova.privsep.path.utime')
def test_create_image_with_size(self, mock_utime, mock_verify, mock_exist,
mock_extend, mock_create, mock_sync):
mock_sync.side_effect = lambda *a, **kw: self._fake_deco
fn = mock.MagicMock()
mock_exist.side_effect = [False, True, False, False, False]
exist_calls = [mock.call(self.DISK_INFO_PATH),
mock.call(self.INSTANCES_PATH),
mock.call(self.TEMPLATE_PATH),
mock.call(self.PATH),
mock.call(self.PATH)]
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH, self.SIZE)
mock_verify.assert_called_once_with(self.TEMPLATE_PATH, self.SIZE)
mock_create.assert_called_once_with(self.TEMPLATE_PATH, self.PATH)
mock_extend.assert_called_once_with(
imgmodel.LocalFileImage(self.PATH, imgmodel.FORMAT_QCOW2),
self.SIZE)
fn.assert_called_once_with(target=self.TEMPLATE_PATH)
mock_exist.assert_has_calls(exist_calls)
self.assertTrue(mock_sync.called)
mock_utime.assert_called()
@mock.patch.object(imagebackend.utils, 'synchronized')
@mock.patch.object(fake_libvirt_utils, 'create_cow_image')
@mock.patch.object(imagebackend.disk, 'extend')
@mock.patch.object(os.path, 'exists', side_effect=[])
@mock.patch.object(imagebackend.Qcow2, 'get_disk_size')
@mock.patch('nova.privsep.path.utime')
def test_create_image_too_small(self, mock_utime, mock_get, mock_exist,
mock_extend, mock_create, mock_sync):
mock_sync.side_effect = lambda *a, **kw: self._fake_deco
mock_get.return_value = self.SIZE
fn = mock.MagicMock()
mock_exist.side_effect = [False, True, True]
exist_calls = [mock.call(self.DISK_INFO_PATH),
mock.call(self.INSTANCES_PATH),
mock.call(self.TEMPLATE_PATH)]
image = self.image_class(self.INSTANCE, self.NAME)
self.assertRaises(exception.FlavorDiskSmallerThanImage,
image.create_image, fn, self.TEMPLATE_PATH, 1)
mock_get.assert_called_once_with(self.TEMPLATE_PATH)
mock_exist.assert_has_calls(exist_calls)
self.assertTrue(mock_sync.called)
self.assertFalse(mock_create.called)
self.assertFalse(mock_extend.called)
@mock.patch.object(imagebackend.utils, 'synchronized')
@mock.patch.object(fake_libvirt_utils, 'create_cow_image')
@mock.patch.object(fake_libvirt_utils, 'get_disk_backing_file')
@mock.patch.object(imagebackend.disk, 'extend')
@mock.patch.object(os.path, 'exists', side_effect=[])
@mock.patch.object(imagebackend.Image, 'verify_base_size')
@mock.patch.object(fake_libvirt_utils, 'copy_image')
@mock.patch('nova.privsep.path.utime')
def test_generate_resized_backing_files(self, mock_utime, mock_copy,
mock_verify, mock_exist,
mock_extend, mock_get,
mock_create, mock_sync):
mock_sync.side_effect = lambda *a, **kw: self._fake_deco
mock_get.return_value = self.QCOW2_BASE
fn = mock.MagicMock()
mock_exist.side_effect = [False, True, False, True, False, True]
exist_calls = [mock.call(self.DISK_INFO_PATH),
mock.call(CONF.instances_path),
mock.call(self.TEMPLATE_PATH),
mock.call(self.PATH),
mock.call(self.QCOW2_BASE),
mock.call(self.PATH)]
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH, self.SIZE)
mock_get.assert_called_once_with(self.PATH)
mock_verify.assert_called_once_with(self.TEMPLATE_PATH, self.SIZE)
mock_copy.assert_called_once_with(self.TEMPLATE_PATH,
self.QCOW2_BASE)
mock_extend.assert_called_once_with(
imgmodel.LocalFileImage(self.QCOW2_BASE,
imgmodel.FORMAT_QCOW2), self.SIZE)
mock_exist.assert_has_calls(exist_calls)
fn.assert_called_once_with(target=self.TEMPLATE_PATH)
self.assertTrue(mock_sync.called)
self.assertFalse(mock_create.called)
mock_utime.assert_called()
@mock.patch.object(imagebackend.utils, 'synchronized')
@mock.patch.object(fake_libvirt_utils, 'create_cow_image')
@mock.patch.object(fake_libvirt_utils, 'get_disk_backing_file')
@mock.patch.object(imagebackend.disk, 'extend')
@mock.patch.object(os.path, 'exists', side_effect=[])
@mock.patch.object(imagebackend.Image, 'verify_base_size')
@mock.patch('nova.privsep.path.utime')
def test_qcow2_exists_and_has_no_backing_file(self, mock_utime,
mock_verify, mock_exist,
mock_extend, mock_get,
mock_create, mock_sync):
mock_sync.side_effect = lambda *a, **kw: self._fake_deco
mock_get.return_value = None
fn = mock.MagicMock()
mock_exist.side_effect = [False, True, False, True, True]
exist_calls = [mock.call(self.DISK_INFO_PATH),
mock.call(self.INSTANCES_PATH),
mock.call(self.TEMPLATE_PATH),
mock.call(self.PATH),
mock.call(self.PATH)]
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH, self.SIZE)
mock_get.assert_called_once_with(self.PATH)
fn.assert_called_once_with(target=self.TEMPLATE_PATH)
mock_verify.assert_called_once_with(self.TEMPLATE_PATH, self.SIZE)
mock_exist.assert_has_calls(exist_calls)
self.assertTrue(mock_sync.called)
self.assertFalse(mock_create.called)
self.assertFalse(mock_extend.called)
def test_resolve_driver_format(self):
image = self.image_class(self.INSTANCE, self.NAME)
driver_format = image.resolve_driver_format()
self.assertEqual(driver_format, 'qcow2')
def test_get_model(self):
image = self.image_class(self.INSTANCE, self.NAME)
model = image.get_model(FakeConn())
self.assertEqual(imgmodel.LocalFileImage(self.PATH,
imgmodel.FORMAT_QCOW2),
model)
class LvmTestCase(_ImageTestCase, test.NoDBTestCase):
VG = 'FakeVG'
TEMPLATE_SIZE = 512
SIZE = 1024
def setUp(self):
self.image_class = imagebackend.Lvm
super(LvmTestCase, self).setUp()
self.flags(images_volume_group=self.VG, group='libvirt')
self.flags(enabled=False, group='ephemeral_storage_encryption')
self.INSTANCE['ephemeral_key_uuid'] = None
self.LV = '%s_%s' % (self.INSTANCE['uuid'], self.NAME)
self.PATH = os.path.join('/dev', self.VG, self.LV)
@mock.patch.object(compute_utils, 'disk_ops_semaphore')
@mock.patch('nova.privsep.utils.supports_direct_io', return_value=True)
@mock.patch.object(imagebackend.lvm, 'create_volume')
@mock.patch.object(imagebackend.disk, 'get_disk_size',
return_value=TEMPLATE_SIZE)
@mock.patch('nova.privsep.qemu.convert_image')
def _create_image(self, sparse, mock_convert_image, mock_get, mock_create,
mock_ignored, mock_disk_op_sema):
fn = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH, None)
mock_create.assert_called_once_with(self.VG, self.LV,
self.TEMPLATE_SIZE,
sparse=sparse)
fn.assert_called_once_with(target=self.TEMPLATE_PATH)
mock_get.assert_called_once_with(self.TEMPLATE_PATH)
path = '/dev/%s/%s_%s' % (self.VG, self.INSTANCE.uuid, self.NAME)
mock_convert_image.assert_called_once_with(
self.TEMPLATE_PATH, path, None, 'raw', CONF.instances_path)
mock_disk_op_sema.__enter__.assert_called_once()
@mock.patch.object(imagebackend.lvm, 'create_volume')
def _create_image_generated(self, sparse, mock_create):
fn = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH,
self.SIZE, ephemeral_size=None)
mock_create.assert_called_once_with(self.VG, self.LV,
self.SIZE, sparse=sparse)
fn.assert_called_once_with(target=self.PATH, ephemeral_size=None)
@mock.patch.object(compute_utils, 'disk_ops_semaphore')
@mock.patch('nova.privsep.utils.supports_direct_io', return_value=True)
@mock.patch.object(imagebackend.disk, 'resize2fs')
@mock.patch.object(imagebackend.lvm, 'create_volume')
@mock.patch.object(imagebackend.disk, 'get_disk_size',
return_value=TEMPLATE_SIZE)
@mock.patch('nova.privsep.qemu.convert_image')
def _create_image_resize(self, sparse, mock_convert_image, mock_get,
mock_create, mock_resize, mock_ignored,
mock_disk_op_sema):
fn = mock.MagicMock()
fn(target=self.TEMPLATE_PATH)
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH, self.SIZE)
mock_create.assert_called_once_with(self.VG, self.LV,
self.SIZE, sparse=sparse)
mock_get.assert_called_once_with(self.TEMPLATE_PATH)
mock_convert_image.assert_called_once_with(
self.TEMPLATE_PATH, self.PATH, None, 'raw',
CONF.instances_path)
mock_disk_op_sema.__enter__.assert_called_once()
mock_resize.assert_called_once_with(self.PATH, run_as_root=True)
@mock.patch.object(imagebackend.fileutils, 'ensure_tree')
@mock.patch.object(os.path, 'exists')
def test_cache(self, mock_exists, mock_ensure):
mock_exists.side_effect = [False, False, False]
exist_calls = [mock.call(self.TEMPLATE_DIR),
mock.call(self.PATH),
mock.call(self.TEMPLATE_PATH)]
fn = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
self.mock_create_image(image)
image.cache(fn, self.TEMPLATE)
fn.assert_called_once_with(target=self.TEMPLATE_PATH)
mock_ensure.assert_called_once_with(self.TEMPLATE_DIR)
mock_exists.assert_has_calls(exist_calls)
@mock.patch.object(os.path, 'exists')
def test_cache_image_exists(self, mock_exists):
mock_exists.side_effect = [True, True, True]
exist_calls = [mock.call(self.TEMPLATE_DIR),
mock.call(self.PATH),
mock.call(self.TEMPLATE_PATH)]
image = self.image_class(self.INSTANCE, self.NAME)
image.cache(None, self.TEMPLATE)
mock_exists.assert_has_calls(exist_calls)
@mock.patch.object(imagebackend.fileutils, 'ensure_tree')
@mock.patch.object(os.path, 'exists', side_effect=[True, False, False])
def test_cache_base_dir_exists(self, mock_exists, mock_ensure):
exist_calls = [mock.call(self.TEMPLATE_DIR),
mock.call(self.PATH),
mock.call(self.TEMPLATE_PATH)]
fn = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
self.mock_create_image(image)
image.cache(fn, self.TEMPLATE)
mock_exists.assert_has_calls(exist_calls)
mock_ensure.assert_not_called()
@mock.patch('os.path.exists', autospec=True)
@mock.patch('nova.utils.synchronized', autospec=True)
@mock.patch.object(imagebackend, 'lvm', autospec=True)
@mock.patch.object(imagebackend.fileutils, 'ensure_tree', autospec=True)
def test_cache_ephemeral(self, mock_ensure, mock_lvm, mock_synchronized,
mock_exists):
# Ignores its arguments and returns the wrapped function unmodified
def fake_synchronized(*args, **kwargs):
def outer(fn):
def wrapper(*wargs, **wkwargs):
fn(*wargs, **wkwargs)
return wrapper
return outer
mock_synchronized.side_effect = fake_synchronized
# Fake exists returns true for paths which have been added to the
# exists set
exists = set()
def fake_exists(path):
return path in exists
mock_exists.side_effect = fake_exists
# Fake create_volume causes exists to return true for the volume
def fake_create_volume(vg, lv, size, sparse=False):
exists.add(os.path.join('/dev', vg, lv))
mock_lvm.create_volume.side_effect = fake_create_volume
# Assert that when we call cache() for an ephemeral disk with the
# Lvm backend, we call fetch_func with a target of the Lvm disk
size_gb = 1
size = size_gb * units.Gi
fetch_func = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
image.cache(fetch_func, self.TEMPLATE,
ephemeral_size=size_gb, size=size)
mock_ensure.assert_called_once_with(self.TEMPLATE_DIR)
mock_lvm.create_volume.assert_called_once_with(self.VG, self.LV, size,
sparse=False)
fetch_func.assert_called_once_with(target=self.PATH,
ephemeral_size=size_gb)
mock_synchronized.assert_called()
def test_create_image(self):
self._create_image(False)
def test_create_image_sparsed(self):
self.flags(sparse_logical_volumes=True, group='libvirt')
self._create_image(True)
def test_create_image_generated(self):
self._create_image_generated(False)
def test_create_image_generated_sparsed(self):
self.flags(sparse_logical_volumes=True, group='libvirt')
self._create_image_generated(True)
def test_create_image_resize(self):
self._create_image_resize(False)
def test_create_image_resize_sparsed(self):
self.flags(sparse_logical_volumes=True, group='libvirt')
self._create_image_resize(True)
@mock.patch.object(imagebackend.lvm, 'create_volume',
side_effect=RuntimeError)
@mock.patch.object(imagebackend.disk, 'get_disk_size',
return_value=TEMPLATE_SIZE)
@mock.patch.object(imagebackend.lvm, 'remove_volumes')
def test_create_image_negative(self, mock_remove, mock_get, mock_create):
fn = mock.MagicMock()
image = self.image_class(self.INSTANCE, self.NAME)
self.assertRaises(RuntimeError, image.create_image, fn,
self.TEMPLATE_PATH, self.SIZE)
mock_create.assert_called_once_with(self.VG, self.LV,
self.SIZE, sparse=False)
fn.assert_called_once_with(target=self.TEMPLATE_PATH)
mock_get.assert_called_once_with(self.TEMPLATE_PATH)
mock_remove.assert_called_once_with([self.PATH])
@mock.patch.object(imagebackend.lvm, 'create_volume')
@mock.patch.object(imagebackend.lvm, 'remove_volumes')
def test_create_image_generated_negative(self, mock_remove, mock_create):
fn = mock.MagicMock()
fn.side_effect = RuntimeError
image = self.image_class(self.INSTANCE, self.NAME)
self.assertRaises(RuntimeError, image.create_image, fn,
self.TEMPLATE_PATH, self.SIZE,
ephemeral_size=None)
mock_create.assert_called_once_with(self.VG, self.LV, self.SIZE,
sparse=False)
fn.assert_called_once_with(target=self.PATH, ephemeral_size=None)
mock_remove.assert_called_once_with([self.PATH])
def test_prealloc_image(self):
CONF.set_override('preallocate_images', 'space')
fake_processutils.fake_execute_clear_log()
fake_processutils.stub_out_processutils_execute(self)
image = self.image_class(self.INSTANCE, self.NAME)
def fake_fetch(target, *args, **kwargs):
return
self.stub_out('os.path.exists', lambda _: True)
self.stub_out('nova.virt.libvirt.imagebackend.Lvm.exists',
lambda *a, **kw: True)
self.stub_out('nova.virt.libvirt.imagebackend.Lvm.get_disk_size',
lambda *a, **kw: self.SIZE)
image.cache(fake_fetch, self.TEMPLATE_PATH, self.SIZE)
self.assertEqual(fake_processutils.fake_execute_get_log(), [])
class EncryptedLvmTestCase(_ImageTestCase, test.NoDBTestCase):
VG = 'FakeVG'
TEMPLATE_SIZE = 512
SIZE = 1024
def setUp(self):
self.image_class = imagebackend.Lvm
super(EncryptedLvmTestCase, self).setUp()
self.flags(enabled=True, group='ephemeral_storage_encryption')
self.flags(cipher='aes-xts-plain64',
group='ephemeral_storage_encryption')
self.flags(key_size=512, group='ephemeral_storage_encryption')
self.flags(fixed_key='00000000000000000000000000000000'
'00000000000000000000000000000000',
group='key_manager')
self.flags(images_volume_group=self.VG, group='libvirt')
self.LV = '%s_%s' % (self.INSTANCE['uuid'], self.NAME)
self.LV_PATH = os.path.join('/dev', self.VG, self.LV)
self.PATH = os.path.join('/dev/mapper',
imagebackend.dmcrypt.volume_name(self.LV))
self.key_manager = key_manager.API()
self.INSTANCE['ephemeral_key_uuid'] =\
self.key_manager.create_key(self.CONTEXT, 'AES', 256)
self.KEY = self.key_manager.get(self.CONTEXT,
self.INSTANCE['ephemeral_key_uuid']).get_encoded()
self.lvm = imagebackend.lvm
self.disk = imagebackend.disk
self.utils = imagebackend.utils
self.libvirt_utils = imagebackend.libvirt_utils
self.dmcrypt = imagebackend.dmcrypt
def _create_image(self, sparse):
with test.nested(
mock.patch('nova.privsep.utils.supports_direct_io',
return_value=True),
mock.patch.object(self.lvm, 'create_volume', mock.Mock()),
mock.patch.object(self.lvm, 'remove_volumes', mock.Mock()),
mock.patch.object(self.disk, 'resize2fs', mock.Mock()),
mock.patch.object(self.disk, 'get_disk_size',
mock.Mock(return_value=self.TEMPLATE_SIZE)),
mock.patch.object(self.dmcrypt, 'create_volume', mock.Mock()),
mock.patch.object(self.dmcrypt, 'delete_volume', mock.Mock()),
mock.patch.object(self.dmcrypt, 'list_volumes', mock.Mock()),
mock.patch.object(self.libvirt_utils, 'create_lvm_image',
mock.Mock()),
mock.patch.object(self.libvirt_utils, 'remove_logical_volumes',
mock.Mock()),
mock.patch('nova.privsep.qemu.convert_image'),
mock.patch.object(compute_utils, 'disk_ops_semaphore')):
fn = mock.Mock()
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH, self.TEMPLATE_SIZE,
context=self.CONTEXT)
compute_utils.disk_ops_semaphore.__enter__.assert_called_once()
fn.assert_called_with(context=self.CONTEXT,
target=self.TEMPLATE_PATH)
self.lvm.create_volume.assert_called_with(self.VG,
self.LV,
self.TEMPLATE_SIZE,
sparse=sparse)
self.dmcrypt.create_volume.assert_called_with(
self.PATH.rpartition('/')[2],
self.LV_PATH,
CONF.ephemeral_storage_encryption.cipher,
CONF.ephemeral_storage_encryption.key_size,
self.KEY)
nova.privsep.qemu.convert_image.assert_called_with(
self.TEMPLATE_PATH, self.PATH, None, 'raw',
CONF.instances_path)
def _create_image_generated(self, sparse):
with test.nested(
mock.patch.object(self.lvm, 'create_volume', mock.Mock()),
mock.patch.object(self.lvm, 'remove_volumes', mock.Mock()),
mock.patch.object(self.disk, 'resize2fs', mock.Mock()),
mock.patch.object(self.disk, 'get_disk_size',
mock.Mock(return_value=self.TEMPLATE_SIZE)),
mock.patch.object(self.dmcrypt, 'create_volume', mock.Mock()),
mock.patch.object(self.dmcrypt, 'delete_volume', mock.Mock()),
mock.patch.object(self.dmcrypt, 'list_volumes', mock.Mock()),
mock.patch.object(self.libvirt_utils, 'create_lvm_image',
mock.Mock()),
mock.patch.object(self.libvirt_utils, 'remove_logical_volumes',
mock.Mock()),
mock.patch('nova.privsep.qemu.convert_image')):
fn = mock.Mock()
image = self.image_class(self.INSTANCE, self.NAME)
image.create_image(fn, self.TEMPLATE_PATH,
self.SIZE,
ephemeral_size=None,
context=self.CONTEXT)