136 lines
5.8 KiB
Python
136 lines
5.8 KiB
Python
# Copyright 2012 Cloudbase Solutions Srl
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Management class for VM snapshot operations.
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"""
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import os
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from os_win import exceptions as os_win_exc
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from os_win import utilsfactory
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from oslo_log import log as logging
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from nova.compute import task_states
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from nova import exception
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from nova.i18n import _LE
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from nova.image import glance
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from nova import utils
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from nova.virt.hyperv import pathutils
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LOG = logging.getLogger(__name__)
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class SnapshotOps(object):
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def __init__(self):
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self._pathutils = pathutils.PathUtils()
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self._vmutils = utilsfactory.get_vmutils()
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self._vhdutils = utilsfactory.get_vhdutils()
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def _save_glance_image(self, context, image_id, image_vhd_path):
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(glance_image_service,
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image_id) = glance.get_remote_image_service(context, image_id)
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image_metadata = {"is_public": False,
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"disk_format": "vhd",
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"container_format": "bare",
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"properties": {}}
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with self._pathutils.open(image_vhd_path, 'rb') as f:
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glance_image_service.update(context, image_id, image_metadata, f)
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def snapshot(self, context, instance, image_id, update_task_state):
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# While the snapshot operation is not synchronized within the manager,
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# attempting to destroy an instance while it's being snapshoted fails.
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@utils.synchronized(instance.uuid)
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def instance_synchronized_snapshot():
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self._snapshot(context, instance, image_id, update_task_state)
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try:
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instance_synchronized_snapshot()
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except os_win_exc.HyperVVMNotFoundException:
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# the instance might dissapear before starting the operation.
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raise exception.InstanceNotFound(instance_id=instance.uuid)
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def _snapshot(self, context, instance, image_id, update_task_state):
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"""Create snapshot from a running VM instance."""
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instance_name = instance.name
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LOG.debug("Creating snapshot for instance %s", instance_name)
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snapshot_path = self._vmutils.take_vm_snapshot(instance_name)
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update_task_state(task_state=task_states.IMAGE_PENDING_UPLOAD)
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export_dir = None
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try:
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src_vhd_path = self._pathutils.lookup_root_vhd_path(instance_name)
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LOG.debug("Getting info for VHD %s", src_vhd_path)
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src_base_disk_path = self._vhdutils.get_vhd_parent_path(
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src_vhd_path)
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export_dir = self._pathutils.get_export_dir(instance_name)
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dest_vhd_path = os.path.join(export_dir, os.path.basename(
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src_vhd_path))
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LOG.debug('Copying VHD %(src_vhd_path)s to %(dest_vhd_path)s',
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{'src_vhd_path': src_vhd_path,
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'dest_vhd_path': dest_vhd_path})
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self._pathutils.copyfile(src_vhd_path, dest_vhd_path)
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image_vhd_path = None
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if not src_base_disk_path:
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image_vhd_path = dest_vhd_path
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else:
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basename = os.path.basename(src_base_disk_path)
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dest_base_disk_path = os.path.join(export_dir, basename)
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LOG.debug('Copying base disk %(src_vhd_path)s to '
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'%(dest_base_disk_path)s',
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{'src_vhd_path': src_vhd_path,
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'dest_base_disk_path': dest_base_disk_path})
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self._pathutils.copyfile(src_base_disk_path,
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dest_base_disk_path)
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LOG.debug("Reconnecting copied base VHD "
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"%(dest_base_disk_path)s and diff "
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"VHD %(dest_vhd_path)s",
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{'dest_base_disk_path': dest_base_disk_path,
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'dest_vhd_path': dest_vhd_path})
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self._vhdutils.reconnect_parent_vhd(dest_vhd_path,
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dest_base_disk_path)
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LOG.debug("Merging diff disk %s into its parent.",
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dest_vhd_path)
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self._vhdutils.merge_vhd(dest_vhd_path)
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image_vhd_path = dest_base_disk_path
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LOG.debug("Updating Glance image %(image_id)s with content from "
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"merged disk %(image_vhd_path)s",
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{'image_id': image_id, 'image_vhd_path': image_vhd_path})
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update_task_state(task_state=task_states.IMAGE_UPLOADING,
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expected_state=task_states.IMAGE_PENDING_UPLOAD)
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self._save_glance_image(context, image_id, image_vhd_path)
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LOG.debug("Snapshot image %(image_id)s updated for VM "
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"%(instance_name)s",
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{'image_id': image_id, 'instance_name': instance_name})
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finally:
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try:
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LOG.debug("Removing snapshot %s", image_id)
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self._vmutils.remove_vm_snapshot(snapshot_path)
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except Exception:
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LOG.exception(_LE('Failed to remove snapshot for VM %s'),
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instance_name, instance=instance)
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if export_dir:
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LOG.debug('Removing directory: %s', export_dir)
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self._pathutils.rmtree(export_dir)
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