OpenStack Block Storage (Cinder)
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# Copyright 2018 Huawei
# 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.
#
"""
Revert to snapshot capable volume driver interface.
"""
from cinder.interface import base
class VolumeSnapshotRevertDriver(base.CinderInterface):
"""Interface for drivers that support revert to snapshot."""
def revert_to_snapshot(self, context, volume, snapshot):
"""Revert volume to snapshot.
Note: the revert process should not change the volume's
current size, that means if the driver shrank
the volume during the process, it should extend the
volume internally.
:param context: the context of the caller.
:param volume: The volume to be reverted.
:param snapshot: The snapshot used for reverting.
"""