97 lines
3.4 KiB
Python
97 lines
3.4 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2012 NetApp, Inc.
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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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"""Volume driver for using NFS as volumes storage. Nova compute part."""
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import ctypes
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import os
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from nova import exception
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from nova.openstack.common import cfg
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from nova.openstack.common import log as logging
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from nova import paths
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from nova import utils
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from nova.virt.libvirt import volume
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LOG = logging.getLogger(__name__)
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volume_opts = [
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cfg.StrOpt('nfs_mount_point_base',
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default=paths.state_path_def('mnt'),
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help='Base dir where nfs expected to be mounted on compute'),
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]
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CONF = cfg.CONF
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CONF.register_opts(volume_opts)
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class NfsVolumeDriver(volume.LibvirtVolumeDriver):
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"""Class implements libvirt part of volume driver for NFS."""
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def __init__(self, *args, **kwargs):
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"""Create back-end to nfs and check connection."""
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super(NfsVolumeDriver, self).__init__(*args, **kwargs)
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def connect_volume(self, connection_info, mount_device):
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"""Connect the volume. Returns xml for libvirt."""
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path = self._ensure_mounted(connection_info['data']['export'])
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path = os.path.join(path, connection_info['data']['name'])
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connection_info['data']['device_path'] = path
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conf = super(NfsVolumeDriver, self).connect_volume(connection_info,
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mount_device)
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conf.source_type = 'file'
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return conf
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def disconnect_volume(self, connection_info, mount_device):
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"""Disconnect the volume."""
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pass
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def _ensure_mounted(self, nfs_export):
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"""
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@type nfs_export: string
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"""
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mount_path = os.path.join(CONF.nfs_mount_point_base,
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self.get_hash_str(nfs_export))
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self._mount_nfs(mount_path, nfs_export, ensure=True)
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return mount_path
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def _mount_nfs(self, mount_path, nfs_share, ensure=False):
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"""Mount nfs export to mount path."""
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if not self._path_exists(mount_path):
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utils.execute('mkdir', '-p', mount_path)
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try:
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utils.execute('mount', '-t', 'nfs', nfs_share, mount_path,
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run_as_root=True)
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except exception.ProcessExecutionError as exc:
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if ensure and 'already mounted' in exc.message:
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LOG.warn(_("%s is already mounted"), nfs_share)
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else:
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raise
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@staticmethod
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def get_hash_str(base_str):
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"""returns string that represents hash of base_str (in hex format)."""
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return str(ctypes.c_uint64(hash(base_str)).value)
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@staticmethod
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def _path_exists(path):
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"""Check path."""
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try:
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return utils.execute('stat', path, run_as_root=True)
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except exception.ProcessExecutionError:
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return False
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