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# Copyright 2013 IBM Corp.
#
# 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
import mock
from oslo_concurrency import processutils
import six
from nova.compute import utils as compute_utils
from nova import exception
from nova import test
from nova.virt import images
class QemuTestCase(test.NoDBTestCase):
def test_qemu_info_with_bad_path(self):
self.assertRaises(exception.DiskNotFound,
images.qemu_img_info,
'/path/that/does/not/exist')
@mock.patch('oslo_concurrency.processutils.execute')
@mock.patch.object(os.path, 'exists', return_value=True)
def test_qemu_info_with_errors(self, path_exists, mock_exec):
err = processutils.ProcessExecutionError(
exit_code=1, stderr='No such file or directory')
mock_exec.side_effect = err
self.assertRaises(exception.DiskNotFound,
images.qemu_img_info,
'/fake/path')
@mock.patch.object(os.path, 'exists', return_value=True)
@mock.patch('nova.privsep.qemu.unprivileged_qemu_img_info',
return_value={})
def test_qemu_info_with_no_errors(self, path_exists,
utils_execute):
image_info = images.qemu_img_info('/fake/path')
self.assertTrue(image_info)
@mock.patch('nova.privsep.qemu.unprivileged_qemu_img_info',
return_value={})
def test_qemu_info_with_rbd_path(self, utils_execute):
# Assert that the use of a RBD URI as the path doesn't raise
# exception.DiskNotFound
image_info = images.qemu_img_info('rbd:volume/pool')
self.assertTrue(image_info)
@mock.patch.object(compute_utils, 'disk_ops_semaphore')
@mock.patch('nova.privsep.utils.supports_direct_io', return_value=True)
@mock.patch.object(processutils, 'execute',
side_effect=processutils.ProcessExecutionError)
def test_convert_image_with_errors(self, mocked_execute, mock_direct_io,
mock_disk_op_sema):
self.assertRaises(exception.ImageUnacceptable,
images.convert_image,
'/path/that/does/not/exist',
'/other/path/that/does/not/exist',
'qcow2',
'raw')
mock_disk_op_sema.__enter__.assert_called_once()
@mock.patch('oslo_concurrency.processutils.execute')
@mock.patch.object(os.path, 'exists', return_value=True)
def test_convert_image_with_prlimit_fail(self, path, mocked_execute):
mocked_execute.side_effect = \
processutils.ProcessExecutionError(exit_code=-9)
exc = self.assertRaises(exception.InvalidDiskInfo,
images.qemu_img_info,
'/fake/path')
self.assertIn('qemu-img aborted by prlimits', six.text_type(exc))
@mock.patch('oslo_concurrency.processutils.execute')
@mock.patch.object(os.path, 'exists', return_value=True)
def test_qemu_img_info_with_disk_not_found(self, exists, mocked_execute):
"""Tests that the initial os.path.exists check passes but the qemu-img
command fails because the path is gone by the time the command runs.
"""
path = '/opt/stack/data/nova/instances/some-uuid/disk'
stderr = (u"qemu-img: Could not open "
"'/opt/stack/data/nova/instances/some-uuid/disk': "
"Could not open '/opt/stack/data/nova/instances/some-uuid/"
"disk': No such file or directory\n")
mocked_execute.side_effect = (
processutils.ProcessExecutionError(
exit_code=1, stderr=stderr))
self.assertRaises(exception.DiskNotFound, images.qemu_img_info, path)
exists.assert_called_once_with(path)
mocked_execute.assert_called_once()
@mock.patch.object(images, 'convert_image',
side_effect=exception.ImageUnacceptable)
@mock.patch.object(images, 'qemu_img_info')
@mock.patch.object(images, 'fetch')
def test_fetch_to_raw_errors(self, convert_image, qemu_img_info, fetch):
qemu_img_info.backing_file = None
qemu_img_info.file_format = 'qcow2'
qemu_img_info.virtual_size = 20
self.assertRaisesRegex(exception.ImageUnacceptable,
'Image href123 is unacceptable.*',
images.fetch_to_raw,
None, 'href123', '/no/path')
@mock.patch.object(compute_utils, 'disk_ops_semaphore')
@mock.patch('nova.privsep.utils.supports_direct_io', return_value=True)
@mock.patch('oslo_concurrency.processutils.execute')
def test_convert_image_with_direct_io_support(self, mock_execute,
mock_direct_io,
mock_disk_op_sema):
images._convert_image('source', 'dest', 'in_format', 'out_format',
run_as_root=False)
expected = ('qemu-img', 'convert', '-t', 'none', '-O', 'out_format',
'-f', 'in_format', 'source', 'dest')
mock_disk_op_sema.__enter__.assert_called_once()
self.assertTupleEqual(expected, mock_execute.call_args[0])
@mock.patch.object(compute_utils, 'disk_ops_semaphore')
@mock.patch('nova.privsep.utils.supports_direct_io', return_value=False)
@mock.patch('oslo_concurrency.processutils.execute')
def test_convert_image_without_direct_io_support(self, mock_execute,
mock_direct_io,
mock_disk_op_sema):
images._convert_image('source', 'dest', 'in_format', 'out_format',
run_as_root=False)
expected = ('qemu-img', 'convert', '-t', 'writeback',
'-O', 'out_format', '-f', 'in_format', 'source', 'dest')
mock_disk_op_sema.__enter__.assert_called_once()
self.assertTupleEqual(expected, mock_execute.call_args[0])
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