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# Copyright 2013 Cloudbase Solutions Srl
#
# 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 mock
from nova import test
from nova.virt.hyperv import constants
from nova.virt.hyperv import vhdutils
from nova.virt.hyperv import vmutils
class VHDUtilsTestCase(test.NoDBTestCase):
"""Unit tests for the Hyper-V VHDUtils class."""
_FAKE_VHD_PATH = "C:\\fake_path.vhdx"
_FAKE_PARENT_PATH = "C:\\fake_parent_path.vhdx"
_FAKE_FORMAT = 3
_FAKE_MAK_INTERNAL_SIZE = 1000
_FAKE_JOB_PATH = 'fake_job_path'
_FAKE_RET_VAL = 0
def setUp(self):
self._vhdutils = vhdutils.VHDUtils()
self._vhdutils._conn = mock.MagicMock()
self._vhdutils._vmutils = mock.MagicMock()
super(VHDUtilsTestCase, self).setUp()
def test_create_dynamic_vhd(self):
self._vhdutils.get_vhd_info = mock.MagicMock(
return_value={'Format': self._FAKE_FORMAT})
mock_img_svc = self._vhdutils._conn.Msvm_ImageManagementService()[0]
mock_img_svc.CreateDynamicVirtualHardDisk.return_value = (
self._FAKE_JOB_PATH, self._FAKE_RET_VAL)
self._vhdutils.create_dynamic_vhd(self._FAKE_VHD_PATH,
self._FAKE_MAK_INTERNAL_SIZE,
constants.DISK_FORMAT_VHD)
mock_img_svc.CreateDynamicVirtualHardDisk.assert_called_once_with(
Path=self._FAKE_VHD_PATH,
MaxInternalSize=self._FAKE_MAK_INTERNAL_SIZE)
def test_create_differencing_vhd(self):
mock_img_svc = self._vhdutils._conn.Msvm_ImageManagementService()[0]
mock_img_svc.CreateDifferencingVirtualHardDisk.return_value = (
self._FAKE_JOB_PATH, self._FAKE_RET_VAL)
self._vhdutils.create_differencing_vhd(self._FAKE_VHD_PATH,
self._FAKE_PARENT_PATH)
mock_img_svc.CreateDifferencingVirtualHardDisk.assert_called_once_with(
Path=self._FAKE_VHD_PATH,
ParentPath=self._FAKE_PARENT_PATH)
def test_create_differencing_vhd_with_new_size(self):
fake_new_size = 1024
self.assertRaises(vmutils.HyperVException,
self._vhdutils.create_differencing_vhd,
self._FAKE_VHD_PATH,
self._FAKE_PARENT_PATH,
fake_new_size)
def test_get_internal_vhd_size_by_file_size_fixed(self):
vhdutil = vhdutils.VHDUtils()
root_vhd_size = 1 * 1024 ** 3
vhdutil.get_vhd_info = mock.MagicMock()
vhdutil.get_vhd_info.return_value = {'Type': constants.VHD_TYPE_FIXED}
real_size = vhdutil.get_internal_vhd_size_by_file_size(None,
root_vhd_size)
expected_vhd_size = 1 * 1024 ** 3 - 512
self.assertEqual(expected_vhd_size, real_size)
def test_get_internal_vhd_size_by_file_size_dynamic(self):
vhdutil = vhdutils.VHDUtils()
root_vhd_size = 20 * 1024 ** 3
vhdutil.get_vhd_info = mock.MagicMock()
vhdutil.get_vhd_info.return_value = {'Type':
constants.VHD_TYPE_DYNAMIC}
vhdutil._get_vhd_dynamic_blk_size = mock.MagicMock()
vhdutil._get_vhd_dynamic_blk_size.return_value = 2097152
real_size = vhdutil.get_internal_vhd_size_by_file_size(None,
root_vhd_size)
expected_vhd_size = 20 * 1024 ** 3 - 43008
self.assertEqual(expected_vhd_size, real_size)
def test_get_internal_vhd_size_by_file_size_differencing(self):
# For differencing images, the internal size of the parent vhd
# is returned
vhdutil = vhdutils.VHDUtils()
root_vhd_size = 20 * 1024 ** 3
vhdutil.get_vhd_info = mock.MagicMock()
vhdutil.get_vhd_parent_path = mock.MagicMock()
vhdutil.get_vhd_parent_path.return_value = self._FAKE_VHD_PATH
vhdutil.get_vhd_info.side_effect = [
{'Type': 4}, {'Type': constants.VHD_TYPE_DYNAMIC}]
vhdutil._get_vhd_dynamic_blk_size = mock.MagicMock()
vhdutil._get_vhd_dynamic_blk_size.return_value = 2097152
real_size = vhdutil.get_internal_vhd_size_by_file_size(None,
root_vhd_size)
expected_vhd_size = 20 * 1024 ** 3 - 43008
self.assertEqual(expected_vhd_size, real_size)
def test_get_vhd_format_vhdx(self):
with mock.patch('nova.virt.hyperv.vhdutils.open',
mock.mock_open(read_data=vhdutils.VHDX_SIGNATURE),
create=True):
format = self._vhdutils.get_vhd_format(self._FAKE_VHD_PATH)
self.assertEqual(constants.DISK_FORMAT_VHDX, format)
def test_get_vhd_format_vhd(self):
with mock.patch('nova.virt.hyperv.vhdutils.open',
mock.mock_open(read_data=vhdutils.VHD_SIGNATURE),
create=True) as mock_open:
f = mock_open.return_value
f.tell.return_value = 1024
format = self._vhdutils.get_vhd_format(self._FAKE_VHD_PATH)
self.assertEqual(constants.DISK_FORMAT_VHD, format)
def test_get_vhd_format_invalid_format(self):
with mock.patch('nova.virt.hyperv.vhdutils.open',
mock.mock_open(read_data='invalid'),
create=True) as mock_open:
f = mock_open.return_value
f.tell.return_value = 1024
self.assertRaises(vmutils.HyperVException,
self._vhdutils.get_vhd_format,
self._FAKE_VHD_PATH)
def test_get_vhd_format_zero_length_file(self):
with mock.patch('nova.virt.hyperv.vhdutils.open',
mock.mock_open(read_data=''),
create=True) as mock_open:
f = mock_open.return_value
f.tell.return_value = 0
self.assertRaises(vmutils.HyperVException,
self._vhdutils.get_vhd_format,
self._FAKE_VHD_PATH)
f.seek.assert_called_once_with(0, 2)
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