Source code for oio.common.xattr

# Copyright (C) 2017-2020 OpenIO SAS, as part of OpenIO SDS
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 3.0 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library.

from __future__ import absolute_import
import errno

from oio.common.constants import chunk_xattr_keys, \
    CHUNK_XATTR_CONTENT_FULLPATH_PREFIX, OIO_VERSION


xattr = None
try:
    # try python-pyxattr
    import xattr
except ImportError:
    pass
if xattr:
    try:
        xattr.get_all
    except AttributeError:
        # fallback to pyxattr compat mode
        from xattr import pyxattr_compat as xattr


[docs]def read_user_xattr(fd): it = {} try: it = xattr.get_all(fd) except IOError as err: for code in ('ENOTSUP', 'EOPNOTSUPP', 'ENOENT'): if hasattr(errno, code) and err.errno == getattr(errno, code): raise err meta = {k[5:]: v for k, v in it if k.startswith('user.')} return meta
[docs]def set_fullpath_xattr(fd, new_fullpaths, remove_old_xattr=False, xattr_to_remove=None): """ Insert new fullpath extended attributes, remove deprecated ones. :param new_fullpaths: dictionary of "fullpath" extended attributes that should be set on file. The key is the chunk ID (required to generate the attribute key), the value is the "fullpath". :param remove_old_xattr: remove legacy attributes from file :type remove_old_xattr: `bool` :param xattr_to_remove: list of extra extended attributes that should be removed from file """ for chunk_id, new_fullpath in new_fullpaths.iteritems(): xattr.setxattr( fd, 'user.' + CHUNK_XATTR_CONTENT_FULLPATH_PREFIX + chunk_id.upper(), new_fullpath) if xattr_to_remove: for key in xattr_to_remove: try: xattr.removexattr(fd, 'user.' + key) except IOError: pass if remove_old_xattr: for key in ['chunk_id', 'container_id', 'content_path', 'content_version', 'content_id']: try: xattr.removexattr(fd, 'user.' + chunk_xattr_keys[key]) except IOError: pass xattr.setxattr(fd, 'user.' + chunk_xattr_keys['oio_version'], OIO_VERSION)