118 lines
4.3 KiB
Python
118 lines
4.3 KiB
Python
# Copyright (C) 2015 Tom Barron <tpb@dyncloud.net>
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# Copyright (C) 2015 Kevin Fox <kevin@efox.cc>
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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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"""Implementation of a backup service that uses NFS storage as the backend."""
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import os
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import stat
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from os_brick import exception as brick_exception
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from os_brick.remotefs import remotefs as remotefs_brick
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from oslo_concurrency import processutils as putils
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from oslo_config import cfg
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from oslo_log import log as logging
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from cinder.backup.drivers import posix
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from cinder import exception
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from cinder import interface
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from cinder import utils
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LOG = logging.getLogger(__name__)
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nfsbackup_service_opts = [
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cfg.StrOpt('backup_mount_point_base',
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default='$state_path/backup_mount',
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help='Base dir containing mount point for NFS share.'),
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cfg.StrOpt('backup_share',
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help='NFS share in hostname:path, ipv4addr:path, '
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'or "[ipv6addr]:path" format.'),
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cfg.StrOpt('backup_mount_options',
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help=('Mount options passed to the NFS client. See NFS '
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'man page for details.')),
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cfg.IntOpt('backup_mount_attempts',
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min=1,
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default=3,
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help='The number of attempts to mount NFS shares before '
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'raising an error.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(nfsbackup_service_opts)
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@interface.backupdriver
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class NFSBackupDriver(posix.PosixBackupDriver):
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"""Provides backup, restore and delete using NFS supplied repository."""
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def __init__(self, context, db=None):
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self.backup_mount_point_base = CONF.backup_mount_point_base
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self.backup_share = CONF.backup_share
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self.mount_options = CONF.backup_mount_options
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self._execute = putils.execute
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self._root_helper = utils.get_root_helper()
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backup_path = self._init_backup_repo_path()
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LOG.debug("Using NFS backup repository: %s", backup_path)
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super(NFSBackupDriver, self).__init__(context,
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backup_path=backup_path)
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def check_for_setup_error(self):
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"""Raises error if any required configuration flag is missing."""
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required_flags = ['backup_share']
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for flag in required_flags:
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val = getattr(CONF, flag, None)
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if not val:
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raise exception.InvalidConfigurationValue(option=flag,
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value=val)
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def _init_backup_repo_path(self):
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if self.backup_share is None:
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LOG.info("_init_backup_repo_path: "
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"backup_share is not set in configuration")
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return
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remotefsclient = remotefs_brick.RemoteFsClient(
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'nfs',
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self._root_helper,
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nfs_mount_point_base=self.backup_mount_point_base,
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nfs_mount_options=self.mount_options)
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@utils.retry(
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(brick_exception.BrickException, putils.ProcessExecutionError),
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retries=CONF.backup_mount_attempts)
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def mount():
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remotefsclient.mount(self.backup_share)
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mount()
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# Ensure we can write to this share
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mount_path = remotefsclient.get_mount_point(self.backup_share)
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group_id = os.getegid()
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current_group_id = utils.get_file_gid(mount_path)
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current_mode = utils.get_file_mode(mount_path)
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if group_id != current_group_id:
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cmd = ['chgrp', '-R', group_id, mount_path]
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self._execute(*cmd, root_helper=self._root_helper,
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run_as_root=True)
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if not (current_mode & stat.S_IWGRP):
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cmd = ['chmod', '-R', 'g+w', mount_path]
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self._execute(*cmd, root_helper=self._root_helper,
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run_as_root=True)
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return mount_path
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