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100 lines
2.9 KiB
Cython
100 lines
2.9 KiB
Cython
import os
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from attic.helpers import posix_acl_use_stored_uid_gid
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API_VERSION = 2
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cdef extern from "errno.h":
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int errno
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int EINVAL
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cdef extern from "sys/types.h":
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int ACL_TYPE_ACCESS
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int ACL_TYPE_DEFAULT
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int ACL_TYPE_NFS4
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cdef extern from "sys/acl.h":
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ctypedef struct _acl_t:
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pass
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ctypedef _acl_t *acl_t
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int acl_free(void *obj)
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acl_t acl_get_link_np(const char *path, int type)
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acl_t acl_set_link_np(const char *path, int type, acl_t acl)
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acl_t acl_from_text(const char *buf)
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char *acl_to_text_np(acl_t acl, ssize_t *len, int flags)
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int ACL_TEXT_NUMERIC_IDS
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int ACL_TEXT_APPEND_ID
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cdef extern from "unistd.h":
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long lpathconf(const char *path, int name)
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int _PC_ACL_NFS4
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cdef _get_acl(p, type, item, attribute, int flags):
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cdef acl_t acl
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cdef char *text
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acl = acl_get_link_np(p, type)
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if acl:
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text = acl_to_text_np(acl, NULL, flags)
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if text:
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item[attribute] = text
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acl_free(text)
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acl_free(acl)
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def acl_get(path, item, st, numeric_owner=False):
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"""Saves ACL Entries
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If `numeric_owner` is True the user/group field is not preserved only uid/gid
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"""
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cdef int flags = ACL_TEXT_APPEND_ID
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p = os.fsencode(path)
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ret = lpathconf(p, _PC_ACL_NFS4)
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if ret < 0 and errno == EINVAL:
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return
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flags |= ACL_TEXT_NUMERIC_IDS if numeric_owner else 0
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if ret > 0:
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_get_acl(p, ACL_TYPE_NFS4, item, b'acl_nfs4', flags)
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else:
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_get_acl(p, ACL_TYPE_ACCESS, item, b'acl_access', flags)
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_get_acl(p, ACL_TYPE_DEFAULT, item, b'acl_default', flags)
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cdef _set_acl(p, type, item, attribute, numeric_owner=False):
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cdef acl_t acl
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text = item.get(attribute)
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if text:
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if numeric_owner and type == ACL_TYPE_NFS4:
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text = _nfs4_use_stored_uid_gid(text)
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elif numeric_owner and type in(ACL_TYPE_ACCESS, ACL_TYPE_DEFAULT):
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text = posix_acl_use_stored_uid_gid(text)
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acl = acl_from_text(<bytes>text)
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if acl:
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acl_set_link_np(p, type, acl)
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acl_free(acl)
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cdef _nfs4_use_stored_uid_gid(acl):
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"""Replace the user/group field with the stored uid/gid
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"""
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entries = []
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for entry in acl.decode('ascii').split('\n'):
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if entry:
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if entry.startswith('user:') or entry.startswith('group:'):
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fields = entry.split(':')
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entries.append(':'.join(fields[0], fields[5], *fields[2:-1]))
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else:
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entries.append(entry)
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return ('\n'.join(entries)).encode('ascii')
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def acl_set(path, item, numeric_owner=False):
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"""Restore ACL Entries
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If `numeric_owner` is True the stored uid/gid is used instead
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of the user/group names
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"""
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p = os.fsencode(path)
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_set_acl(p, ACL_TYPE_NFS4, item, b'acl_nfs4', numeric_owner)
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_set_acl(p, ACL_TYPE_ACCESS, item, b'acl_access', numeric_owner)
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_set_acl(p, ACL_TYPE_DEFAULT, item, b'acl_default', numeric_owner)
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