def _copy_volume_from_snapshot(self, snapshot, volume, volume_size):
"""Copy data from snapshot to destination volume.
This is done with a qemu-img convert to raw/qcow2 from the snapshot
qcow2.
"""
LOG.debug(
"_copy_volume_from_snapshot: snapshot: %(snap)s, "
"volume: %(vol)s, volume_size: %(size)s.", {
'snap': snapshot['id'],
'vol': volume['id'],
'size': volume_size,
})
info_path = self._local_path_volume_info(snapshot['volume'])
snap_info = self._read_info_file(info_path)
vol_dir = self._local_volume_dir(snapshot['volume'])
out_format = self.choose_volume_format(volume)
qemu_out_format = image_utils.fixup_disk_format(out_format)
volume_format = self.get_volume_format(snapshot.volume)
volume_path = self.local_path(volume)
forward_file = snap_info[snapshot['id']]
forward_path = os.path.join(vol_dir, forward_file)
if volume_format in (DISK_FORMAT_QCOW2, DISK_FORMAT_RAW):
forward_file = snap_info[snapshot.id]
forward_path = os.path.join(vol_dir, forward_file)
# Find the file which backs this file, which represents the point
# when this snapshot was created.
img_info = self._qemu_img_info(forward_path, snapshot.volume.name)
path_to_snap_img = os.path.join(vol_dir, img_info.backing_file)
LOG.debug(
"_copy_volume_from_snapshot: will copy "
"from snapshot at %s.", path_to_snap_img)
image_utils.convert_image(path_to_snap_img, volume_path,
qemu_out_format)
else:
msg = _("Unsupported volume format %s") % volume_format
raise exception.InvalidVolume(msg)
self._extend_volume(volume, volume_size, out_format)
# Query qemu-img info to cache the output
img_info = self._qemu_img_info(volume_path, volume.name)
def _copy_volume_from_snapshot(self, snapshot, volume, volume_size):
"""Copy data from snapshot to destination volume.
This is done with a qemu-img convert to raw/qcow2 from the snapshot
qcow2.
"""
info_path = self._local_path_volume_info(snapshot.volume)
snap_info = self._read_info_file(info_path)
vol_dir = self._local_volume_dir(snapshot.volume)
out_format = self.choose_volume_format(volume)
qemu_out_format = image_utils.fixup_disk_format(out_format)
volume_format = self.get_volume_format(snapshot.volume)
volume_path = self.local_path(volume)
if volume_format in (DISK_FORMAT_QCOW2, DISK_FORMAT_RAW):
forward_file = snap_info[snapshot.id]
forward_path = os.path.join(vol_dir, forward_file)
# Find the file which backs this file, which represents the point
# when this snapshot was created.
img_info = self._qemu_img_info(forward_path,
snapshot.volume.name)
path_to_snap_img = os.path.join(vol_dir, img_info.backing_file)
LOG.debug("_copy_volume_from_snapshot: will copy "
"from snapshot at %s.", path_to_snap_img)
image_utils.convert_image(path_to_snap_img,
volume_path,
qemu_out_format)
elif volume_format == DISK_FORMAT_PLOOP:
with PloopDevice(self.local_path(snapshot.volume),
snapshot.id,
execute=self._execute) as dev:
base_file = os.path.join(volume_path, 'root.hds')
image_utils.convert_image(dev,
base_file,
qemu_out_format)
else:
msg = _("Unsupported volume format %s") % volume_format
raise exception.InvalidVolume(msg)
self._extend_volume(volume, volume_size, out_format)
# Query qemu-img info to cache the output
img_info = self._qemu_img_info(volume_path, volume.name)
def copy_image_to_volume(self, context, volume, image_service, image_id):
"""Fetch the image from image_service and write it to the volume."""
volume_format = self.get_volume_format(volume)
qemu_volume_format = image_utils.fixup_disk_format(volume_format)
image_path = self.local_path(volume)
if volume_format == DISK_FORMAT_PLOOP:
image_path = os.path.join(image_path, PLOOP_BASE_DELTA_NAME)
image_utils.fetch_to_volume_format(
context, image_service, image_id, image_path, qemu_volume_format,
self.configuration.volume_dd_blocksize)
if volume_format == DISK_FORMAT_PLOOP:
self._recreate_ploop_desc(self.local_path(volume), image_path)
self._do_extend_volume(self.local_path(volume), volume.size,
volume_format)
# Query qemu-img info to cache the output
self._qemu_img_info(self.local_path(volume), volume.name)
def copy_image_to_volume(self, context, volume, image_service, image_id):
"""Fetch the image from image_service and write it to the volume."""
volume_format = self.get_volume_format(volume)
qemu_volume_format = image_utils.fixup_disk_format(volume_format)
image_path = self.local_path(volume)
if volume_format == DISK_FORMAT_PLOOP:
image_path = os.path.join(image_path, PLOOP_BASE_DELTA_NAME)
image_utils.fetch_to_volume_format(
context, image_service, image_id,
image_path, qemu_volume_format,
self.configuration.volume_dd_blocksize)
if volume_format == DISK_FORMAT_PLOOP:
self._recreate_ploop_desc(self.local_path(volume), image_path)
self._do_extend_volume(self.local_path(volume),
volume.size,
volume_format)
# Query qemu-img info to cache the output
self._qemu_img_info(self.local_path(volume), volume.name)