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# Copyright 2012 Cloudbase Solutions Srl
# 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.
"""
Management class for VM snapshot operations.
"""
import os
from os_win import utilsfactory
from oslo_log import log as logging
from nova.compute import task_states
from nova.image import glance
from nova.virt.hyperv import pathutils
LOG = logging.getLogger(__name__)
class SnapshotOps(object):
def __init__(self):
self._pathutils = pathutils.PathUtils()
self._vmutils = utilsfactory.get_vmutils()
self._vhdutils = utilsfactory.get_vhdutils()
def _save_glance_image(self, context, image_id, image_vhd_path):
(glance_image_service,
image_id) = glance.get_remote_image_service(context, image_id)
image_metadata = {"disk_format": "vhd",
"container_format": "bare"}
with self._pathutils.open(image_vhd_path, 'rb') as f:
glance_image_service.update(context, image_id, image_metadata, f,
purge_props=False)
def snapshot(self, context, instance, image_id, update_task_state):
"""Create snapshot from a running VM instance."""
instance_name = instance.name
LOG.debug("Creating snapshot for instance %s", instance_name)
snapshot_path = self._vmutils.take_vm_snapshot(instance_name)
update_task_state(task_state=task_states.IMAGE_PENDING_UPLOAD)
export_dir = None
try:
src_vhd_path = self._pathutils.lookup_root_vhd_path(instance_name)
LOG.debug("Getting info for VHD %s", src_vhd_path)
src_base_disk_path = self._vhdutils.get_vhd_parent_path(
src_vhd_path)
export_dir = self._pathutils.get_export_dir(instance_name)
dest_vhd_path = os.path.join(export_dir, os.path.basename(
src_vhd_path))
LOG.debug('Copying VHD %(src_vhd_path)s to %(dest_vhd_path)s',
{'src_vhd_path': src_vhd_path,
'dest_vhd_path': dest_vhd_path})
self._pathutils.copyfile(src_vhd_path, dest_vhd_path)
image_vhd_path = None
if not src_base_disk_path:
image_vhd_path = dest_vhd_path
else:
basename = os.path.basename(src_base_disk_path)
dest_base_disk_path = os.path.join(export_dir, basename)
LOG.debug('Copying base disk %(src_vhd_path)s to '
'%(dest_base_disk_path)s',
{'src_vhd_path': src_vhd_path,
'dest_base_disk_path': dest_base_disk_path})
self._pathutils.copyfile(src_base_disk_path,
dest_base_disk_path)
LOG.debug("Reconnecting copied base VHD "
"%(dest_base_disk_path)s and diff "
"VHD %(dest_vhd_path)s",
{'dest_base_disk_path': dest_base_disk_path,
'dest_vhd_path': dest_vhd_path})
self._vhdutils.reconnect_parent_vhd(dest_vhd_path,
dest_base_disk_path)
LOG.debug("Merging diff disk %s into its parent.",
dest_vhd_path)
self._vhdutils.merge_vhd(dest_vhd_path)
image_vhd_path = dest_base_disk_path
LOG.debug("Updating Glance image %(image_id)s with content from "
"merged disk %(image_vhd_path)s",
{'image_id': image_id, 'image_vhd_path': image_vhd_path})
update_task_state(task_state=task_states.IMAGE_UPLOADING,
expected_state=task_states.IMAGE_PENDING_UPLOAD)
self._save_glance_image(context, image_id, image_vhd_path)
LOG.debug("Snapshot image %(image_id)s updated for VM "
"%(instance_name)s",
{'image_id': image_id, 'instance_name': instance_name})
finally:
try:
LOG.debug("Removing snapshot %s", image_id)
self._vmutils.remove_vm_snapshot(snapshot_path)
except Exception:
LOG.exception('Failed to remove snapshot for VM %s',
instance_name, instance=instance)
if export_dir:
LOG.debug('Removing directory: %s', export_dir)
self._pathutils.rmtree(export_dir)
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