143 lines
5.4 KiB
Python
143 lines
5.4 KiB
Python
# Copyright 2014 Cloudbase Solutions Srl
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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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import ctypes
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import os
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import sys
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if sys.platform == 'win32':
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import wmi
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from oslo_log import log as logging
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import six
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from cinder.brick.remotefs import remotefs
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from cinder import exception
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from cinder.i18n import _, _LE, _LI
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LOG = logging.getLogger(__name__)
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class WindowsRemoteFsClient(remotefs.RemoteFsClient):
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_FILE_ATTRIBUTE_REPARSE_POINT = 0x0400
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def __init__(self, *args, **kwargs):
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super(WindowsRemoteFsClient, self).__init__(*args, **kwargs)
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self.smb_conn = wmi.WMI(moniker='root/Microsoft/Windows/SMB')
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self.conn_cimv2 = wmi.WMI(moniker='root/cimv2')
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def mount(self, export_path, mnt_options=None):
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if not os.path.isdir(self._mount_base):
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os.makedirs(self._mount_base)
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export_hash = self._get_hash_str(export_path)
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norm_path = os.path.abspath(export_path)
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mnt_options = mnt_options or {}
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if not self.check_smb_mapping(norm_path):
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self._mount(norm_path, mnt_options)
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link_path = os.path.join(self._mount_base, export_hash)
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if os.path.exists(link_path):
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if not self.is_symlink(link_path):
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raise exception.SmbfsException(_("Link path already exists "
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"and its not a symlink"))
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else:
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self.create_sym_link(link_path, norm_path)
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def is_symlink(self, path):
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if sys.version_info >= (3, 2):
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return os.path.islink(path)
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file_attr = ctypes.windll.kernel32.GetFileAttributesW(
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six.text_type(path))
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return bool(os.path.isdir(path) and (
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file_attr & self._FILE_ATTRIBUTE_REPARSE_POINT))
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def create_sym_link(self, link, target, target_is_dir=True):
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"""If target_is_dir is True, a junction will be created.
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NOTE: Juctions only work on same filesystem.
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"""
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symlink = ctypes.windll.kernel32.CreateSymbolicLinkW
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symlink.argtypes = (
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ctypes.c_wchar_p,
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ctypes.c_wchar_p,
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ctypes.c_ulong,
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)
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symlink.restype = ctypes.c_ubyte
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retcode = symlink(link, target, target_is_dir)
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if retcode == 0:
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err_msg = (_("Could not create symbolic link. "
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"Link: %(link)s Target %(target)s")
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% {'link': link, 'target': target})
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raise exception.VolumeBackendAPIException(err_msg)
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def check_smb_mapping(self, smbfs_share):
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mappings = self.smb_conn.query("SELECT * FROM "
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"MSFT_SmbMapping "
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"WHERE RemotePath='%s'" %
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smbfs_share)
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if len(mappings) > 0:
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if os.path.exists(smbfs_share):
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LOG.debug('Share already mounted: %s', smbfs_share)
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return True
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else:
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LOG.debug('Share exists but is unavailable: %s ', smbfs_share)
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for mapping in mappings:
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# Due to a bug in the WMI module, getting the output of
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# methods returning None will raise an AttributeError
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try:
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mapping.Remove(True, True)
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except AttributeError:
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pass
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return False
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def _mount(self, smbfs_share, options):
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smb_opts = {'RemotePath': smbfs_share}
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smb_opts['UserName'] = (options.get('username') or
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options.get('user'))
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smb_opts['Password'] = (options.get('password') or
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options.get('pass'))
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try:
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LOG.info(_LI('Mounting share: %s'), smbfs_share)
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self.smb_conn.Msft_SmbMapping.Create(**smb_opts)
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except wmi.x_wmi as exc:
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err_msg = (_(
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'Unable to mount SMBFS share: %(smbfs_share)s '
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'WMI exception: %(wmi_exc)s'
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'Options: %(options)s') % {'smbfs_share': smbfs_share,
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'options': smb_opts,
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'wmi_exc': six.text_type(exc)})
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raise exception.VolumeBackendAPIException(data=err_msg)
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def get_capacity_info(self, smbfs_share):
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norm_path = os.path.abspath(smbfs_share)
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kernel32 = ctypes.windll.kernel32
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free_bytes = ctypes.c_ulonglong(0)
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total_bytes = ctypes.c_ulonglong(0)
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retcode = kernel32.GetDiskFreeSpaceExW(ctypes.c_wchar_p(norm_path),
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None,
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ctypes.pointer(total_bytes),
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ctypes.pointer(free_bytes))
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if retcode == 0:
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LOG.error(_LE("Could not get share %s capacity info."),
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smbfs_share)
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return 0, 0
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return total_bytes.value, free_bytes.value
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