python/samba/xattr.py

   1 # Utility code for dealing with POSIX extended attributes
   2 #
   3 # Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2012
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 from samba.dcerpc import xattr
  19 import os
  20 import samba.xattr_native
  21 import shutil
  22
  23
  24 def copyattrs(frompath, topath):
  25     """Copy ACL related attributes from a path to another path."""
  26     for attr_name in (xattr.XATTR_NTACL_NAME, "system.posix_acl_access"):
  27         # Get the xattr attributes if any
  28         try:
  29             attribute = samba.xattr_native.wrap_getxattr(frompath,
  30                                                          xattr.XATTR_NTACL_NAME)
  31             samba.xattr_native.wrap_setxattr(topath,
  32                                              xattr.XATTR_NTACL_NAME,
  33                                              attribute)
  34         except Exception:
  35             pass
  36             # FIXME:Catch a specific exception
  37
  38
  39 def copytree_with_xattrs(src, dst):
  40     """Recursively copy a directory tree using shutil.copy2(), preserving xattrs.
  41
  42     The destination directory must not already exist.
  43     If exception(s) occur, an Error is raised with a list of reasons.
  44     """
  45     names = os.listdir(src)
  46
  47     os.makedirs(dst)
  48     for name in names:
  49         srcname = os.path.join(src, name)
  50         dstname = os.path.join(dst, name)
  51         if os.path.islink(srcname):
  52             linkto = os.readlink(srcname)
  53             os.symlink(linkto, dstname)
  54         elif os.path.isdir(srcname):
  55             copytree_with_xattrs(srcname, dstname)
  56         else:
  57             # Will raise a SpecialFileError for unsupported file types
  58             shutil.copy2(srcname, dstname)
  59     shutil.copystat(src, dst)
  60     copyattrs(src, dst)