104 lines
3.6 KiB
Python
104 lines
3.6 KiB
Python
# Copyright 2012 OpenStack LLC
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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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SheepDog Volume Driver.
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"""
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from cinder import exception
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from cinder import flags
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from cinder.openstack.common import log as logging
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from cinder.volume import driver
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LOG = logging.getLogger(__name__)
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FLAGS = flags.FLAGS
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class SheepdogDriver(driver.VolumeDriver):
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"""Executes commands relating to Sheepdog Volumes"""
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def check_for_setup_error(self):
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"""Returns an error if prerequisites aren't met"""
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try:
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#NOTE(francois-charlier) Since 0.24 'collie cluster info -r'
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# gives short output, but for compatibility reason we won't
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# use it and just check if 'running' is in the output.
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(out, err) = self._execute('collie', 'cluster', 'info')
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if 'running' not in out.split():
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exception_message = (_("Sheepdog is not working: %s") % out)
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raise exception.VolumeBackendAPIException(
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data=exception_message)
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except exception.ProcessExecutionError:
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exception_message = _("Sheepdog is not working")
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raise exception.VolumeBackendAPIException(data=exception_message)
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def create_cloned_volume(self, volume, src_vref):
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raise NotImplementedError()
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def create_volume(self, volume):
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"""Creates a sheepdog volume"""
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self._try_execute('qemu-img', 'create',
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"sheepdog:%s" % volume['name'],
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'%sG' % volume['size'])
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def create_volume_from_snapshot(self, volume, snapshot):
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"""Creates a sheepdog volume from a snapshot."""
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self._try_execute('qemu-img', 'create', '-b',
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"sheepdog:%s:%s" % (snapshot['volume_name'],
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snapshot['name']),
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"sheepdog:%s" % volume['name'])
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def delete_volume(self, volume):
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"""Deletes a logical volume"""
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self._try_execute('collie', 'vdi', 'delete', volume['name'])
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def create_snapshot(self, snapshot):
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"""Creates a sheepdog snapshot"""
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self._try_execute('qemu-img', 'snapshot', '-c', snapshot['name'],
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"sheepdog:%s" % snapshot['volume_name'])
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def delete_snapshot(self, snapshot):
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"""Deletes a sheepdog snapshot"""
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self._try_execute('collie', 'vdi', 'delete', snapshot['volume_name'],
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'-s', snapshot['name'])
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def local_path(self, volume):
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return "sheepdog:%s" % volume['name']
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def ensure_export(self, context, volume):
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"""Safely and synchronously recreates an export for a logical volume"""
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pass
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def create_export(self, context, volume):
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"""Exports the volume"""
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pass
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def remove_export(self, context, volume):
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"""Removes an export for a logical volume"""
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pass
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def initialize_connection(self, volume, connector):
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return {
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'driver_volume_type': 'sheepdog',
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'data': {
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'name': volume['name']
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}
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}
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def terminate_connection(self, volume, connector, **kwargs):
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pass
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