def create_cow_image(backing_file, path, size=None):
"""Create COW image
Creates a COW image with the given backing file
:param backing_file: Existing image on which to base the COW image
:param path: Desired location of the COW image
"""
base_cmd = ['qemu-img', 'create', '-f', 'qcow2']
cow_opts = []
if backing_file:
cow_opts += ['backing_file=%s' % backing_file]
base_details = images.qemu_img_info(backing_file)
else:
base_details = None
# This doesn't seem to get inherited so force it to...
# http://paste.ubuntu.com/1213295/
# TODO(harlowja) probably file a bug against qemu-img/qemu
if base_details and base_details.cluster_size is not None:
cow_opts += ['cluster_size=%s' % base_details.cluster_size]
# For now don't inherit this due the following discussion...
# See: http://www.gossamer-threads.com/lists/openstack/dev/10592
# if 'preallocation' in base_details:
# cow_opts += ['preallocation=%s' % base_details['preallocation']]
if base_details and base_details.encrypted:
cow_opts += ['encryption=%s' % base_details.encrypted]
if size is not None:
cow_opts += ['size=%s' % size]
if cow_opts:
# Format as a comma separated list
csv_opts = ",".join(cow_opts)
cow_opts = ['-o', csv_opts]
cmd = base_cmd + cow_opts + [path]
execute(*cmd)
def create_cow_image(backing_file, path, size=None):
"""Create COW image
Creates a COW image with the given backing file
:param backing_file: Existing image on which to base the COW image
:param path: Desired location of the COW image
"""
base_cmd = ['qemu-img', 'create', '-f', 'qcow2']
cow_opts = []
if backing_file:
cow_opts += ['backing_file=%s' % backing_file]
base_details = images.qemu_img_info(backing_file)
else:
base_details = None
# This doesn't seem to get inherited so force it to...
# http://paste.ubuntu.com/1213295/
# TODO(harlowja) probably file a bug against qemu-img/qemu
if base_details and base_details.cluster_size is not None:
cow_opts += ['cluster_size=%s' % base_details.cluster_size]
# For now don't inherit this due the following discussion...
# See: http://www.gossamer-threads.com/lists/openstack/dev/10592
# if 'preallocation' in base_details:
# cow_opts += ['preallocation=%s' % base_details['preallocation']]
if base_details and base_details.encrypted:
cow_opts += ['encryption=%s' % base_details.encrypted]
if size is not None:
cow_opts += ['size=%s' % size]
if cow_opts:
# Format as a comma separated list
csv_opts = ",".join(cow_opts)
cow_opts = ['-o', csv_opts]
cmd = base_cmd + cow_opts + [path]
execute(*cmd)
def test_qemu_backing_file_actual(self,
mock_execute, mock_exists):
path = "disk.config"
example_output = """image: disk.config
file format: raw
virtual size: 64M (67108864 bytes)
cluster_size: 65536
disk size: 96K
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 d9a9784a500742a7bb95627bb3aace38 0 2012-08-20 10:52:46 00:00:00.000
backing file: /var/lib/patron/a328c7998805951a_2 (actual path: /b/3a988059e51a_2)
"""
mock_execute.return_value = (example_output, '')
image_info = images.qemu_img_info(path)
mock_execute.assert_called_once_with('env', 'LC_ALL=C', 'LANG=C',
'qemu-img', 'info', path)
mock_exists.assert_called_once_with(path)
self.assertEqual('disk.config', image_info.image)
self.assertEqual('raw', image_info.file_format)
self.assertEqual(67108864, image_info.virtual_size)
self.assertEqual(98304, image_info.disk_size)
self.assertEqual(1, len(image_info.snapshots))
self.assertEqual('/b/3a988059e51a_2',
image_info.backing_file)
def get_disk_size(path):
"""Get the (virtual) size of a disk image
:param path: Path to the disk image
:returns: Size (in bytes) of the given disk image as it would be seen
by a virtual machine.
"""
return images.qemu_img_info(path).virtual_size
def get_disk_type(path):
"""Retrieve disk type (raw, qcow2, lvm) for given file."""
if path.startswith('/dev'):
return 'lvm'
elif path.startswith('rbd:'):
return 'rbd'
return images.qemu_img_info(path).file_format
def get_disk_size(path):
"""Get the (virtual) size of a disk image
:param path: Path to the disk image
:returns: Size (in bytes) of the given disk image as it would be seen
by a virtual machine.
"""
return images.qemu_img_info(path).virtual_size
def get_disk_type(path):
"""Retrieve disk type (raw, qcow2, lvm) for given file."""
if path.startswith('/dev'):
return 'lvm'
elif path.startswith('rbd:'):
return 'rbd'
return images.qemu_img_info(path).file_format
def _get_driver_format(self):
try:
data = images.qemu_img_info(self.path)
return data.file_format
except exception.InvalidDiskInfo as e:
LOG.info(_LI('Failed to get image info from path %(path)s; '
'error: %(error)s'),
{'path': self.path,
'error': e})
return 'raw'
def get_disk_backing_file(path, basename=True):
"""Get the backing file of a disk image
:param path: Path to the disk image
:returns: a path to the image's backing store
"""
backing_file = images.qemu_img_info(path).backing_file
if backing_file and basename:
backing_file = os.path.basename(backing_file)
return backing_file
def get_disk_backing_file(path, basename=True):
"""Get the backing file of a disk image
:param path: Path to the disk image
:returns: a path to the image's backing store
"""
backing_file = images.qemu_img_info(path).backing_file
if backing_file and basename:
backing_file = os.path.basename(backing_file)
return backing_file
def _get_driver_format(self):
try:
data = images.qemu_img_info(self.path)
return data.file_format
except exception.InvalidDiskInfo as e:
LOG.info(
_LI('Failed to get image info from path %(path)s; '
'error: %(error)s'), {
'path': self.path,
'error': e
})
return 'raw'
def test_qemu_info_canon(self, mock_execute, mock_exists):
path = "disk.config"
example_output = """image: disk.config
file format: raw
virtual size: 64M (67108864 bytes)
cluster_size: 65536
disk size: 96K
blah BLAH: bb
"""
mock_execute.return_value = (example_output, '')
image_info = images.qemu_img_info(path)
mock_execute.assert_called_once_with('env', 'LC_ALL=C', 'LANG=C',
'qemu-img', 'info', path)
mock_exists.assert_called_once_with(path)
self.assertEqual('disk.config', image_info.image)
self.assertEqual('raw', image_info.file_format)
self.assertEqual(67108864, image_info.virtual_size)
self.assertEqual(98304, image_info.disk_size)
self.assertEqual(65536, image_info.cluster_size)
def test_qemu_info_canon(self, mock_execute, mock_exists):
path = "disk.config"
example_output = """image: disk.config
file format: raw
virtual size: 64M (67108864 bytes)
cluster_size: 65536
disk size: 96K
blah BLAH: bb
"""
mock_execute.return_value = (example_output, '')
image_info = images.qemu_img_info(path)
mock_execute.assert_called_once_with('env', 'LC_ALL=C', 'LANG=C',
'qemu-img', 'info', path)
mock_exists.assert_called_once_with(path)
self.assertEqual('disk.config', image_info.image)
self.assertEqual('raw', image_info.file_format)
self.assertEqual(67108864, image_info.virtual_size)
self.assertEqual(98304, image_info.disk_size)
self.assertEqual(65536, image_info.cluster_size)
def test_qemu_info_canon2(self, mock_execute, mock_exists):
path = "disk.config"
example_output = """image: disk.config
file format: QCOW2
virtual size: 67108844
cluster_size: 65536
disk size: 963434
backing file: /var/lib/patron/a328c7998805951a_2
"""
mock_execute.return_value = (example_output, '')
image_info = images.qemu_img_info(path)
mock_execute.assert_called_once_with('env', 'LC_ALL=C', 'LANG=C',
'qemu-img', 'info', path)
mock_exists.assert_called_once_with(path)
self.assertEqual('disk.config', image_info.image)
self.assertEqual('qcow2', image_info.file_format)
self.assertEqual(67108844, image_info.virtual_size)
self.assertEqual(963434, image_info.disk_size)
self.assertEqual(65536, image_info.cluster_size)
self.assertEqual('/var/lib/patron/a328c7998805951a_2',
image_info.backing_file)
def test_qemu_info_canon2(self, mock_execute, mock_exists):
path = "disk.config"
example_output = """image: disk.config
file format: QCOW2
virtual size: 67108844
cluster_size: 65536
disk size: 963434
backing file: /var/lib/patron/a328c7998805951a_2
"""
mock_execute.return_value = (example_output, '')
image_info = images.qemu_img_info(path)
mock_execute.assert_called_once_with('env', 'LC_ALL=C', 'LANG=C',
'qemu-img', 'info', path)
mock_exists.assert_called_once_with(path)
self.assertEqual('disk.config', image_info.image)
self.assertEqual('qcow2', image_info.file_format)
self.assertEqual(67108844, image_info.virtual_size)
self.assertEqual(963434, image_info.disk_size)
self.assertEqual(65536, image_info.cluster_size)
self.assertEqual('/var/lib/patron/a328c7998805951a_2',
image_info.backing_file)
def test_qemu_info_snaps(self, mock_execute, mock_exists):
path = "disk.config"
example_output = """image: disk.config
file format: raw
virtual size: 64M (67108864 bytes)
disk size: 96K
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 d9a9784a500742a7bb95627bb3aace38 0 2012-08-20 10:52:46 00:00:00.000
3 d9a9784a500742a7bb95627bb3aace38 0 2012-08-20 10:52:46 00:00:00.000
4 d9a9784a500742a7bb95627bb3aace38 0 2012-08-20 10:52:46 00:00:00.000
"""
mock_execute.return_value = (example_output, '')
image_info = images.qemu_img_info(path)
mock_execute.assert_called_once_with('env', 'LC_ALL=C', 'LANG=C',
'qemu-img', 'info', path)
mock_exists.assert_called_once_with(path)
self.assertEqual('disk.config', image_info.image)
self.assertEqual('raw', image_info.file_format)
self.assertEqual(67108864, image_info.virtual_size)
self.assertEqual(98304, image_info.disk_size)
self.assertEqual(3, len(image_info.snapshots))
def test_qemu_info_snaps(self, mock_execute, mock_exists):
path = "disk.config"
example_output = """image: disk.config
file format: raw
virtual size: 64M (67108864 bytes)
disk size: 96K
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 d9a9784a500742a7bb95627bb3aace38 0 2012-08-20 10:52:46 00:00:00.000
3 d9a9784a500742a7bb95627bb3aace38 0 2012-08-20 10:52:46 00:00:00.000
4 d9a9784a500742a7bb95627bb3aace38 0 2012-08-20 10:52:46 00:00:00.000
"""
mock_execute.return_value = (example_output, '')
image_info = images.qemu_img_info(path)
mock_execute.assert_called_once_with('env', 'LC_ALL=C', 'LANG=C',
'qemu-img', 'info', path)
mock_exists.assert_called_once_with(path)
self.assertEqual('disk.config', image_info.image)
self.assertEqual('raw', image_info.file_format)
self.assertEqual(67108864, image_info.virtual_size)
self.assertEqual(98304, image_info.disk_size)
self.assertEqual(3, len(image_info.snapshots))
def test_qemu_backing_file_actual(self, mock_execute, mock_exists):
path = "disk.config"
example_output = """image: disk.config
file format: raw
virtual size: 64M (67108864 bytes)
cluster_size: 65536
disk size: 96K
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 d9a9784a500742a7bb95627bb3aace38 0 2012-08-20 10:52:46 00:00:00.000
backing file: /var/lib/patron/a328c7998805951a_2 (actual path: /b/3a988059e51a_2)
"""
mock_execute.return_value = (example_output, '')
image_info = images.qemu_img_info(path)
mock_execute.assert_called_once_with('env', 'LC_ALL=C', 'LANG=C',
'qemu-img', 'info', path)
mock_exists.assert_called_once_with(path)
self.assertEqual('disk.config', image_info.image)
self.assertEqual('raw', image_info.file_format)
self.assertEqual(67108864, image_info.virtual_size)
self.assertEqual(98304, image_info.disk_size)
self.assertEqual(1, len(image_info.snapshots))
self.assertEqual('/b/3a988059e51a_2', image_info.backing_file)
def test_qemu_info_with_no_errors(self, path_exists,
utils_execute):
image_info = images.qemu_img_info('/fake/path')
self.assertTrue(image_info)
self.assertTrue(str(image_info))
