kc3-lang/gnulib/lib/qset-acl.c

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• Hash : 2d5ce445
  Author :
  Date : 2015-04-11T14:44:30
  

  qacl: Reimplement qset_acl and qcopy_acl (Bug#20666)
  
  Implement get_permissions and set_permissions primitives for getting all
  the permissions of a file, storing them, and later setting them. (In the
  minimal case, the permissions consist only of a file mode.) Reimplement
  qset_acl and qcopy_acl based on these new primitives: this avoids code
  duplication and makes error handling more consistent.
  
  The Solaris and Cygwin code still uses duplicate code paths for setting
  a file mode while making sure that no acls exist and setting an explicit
  acl; this is no worse than before, but could be cleaned up.  The AIX
  code still doesn't read ACLs, it only makes sure that acls don't get in
  the way when setting a file mode.
  
  * lib/acl-internal.h (struct permission_context): New data structure.
  (get_permissions, set_permissions, free_permission_context): Declare.
  * lib/acl-internal.c (free_permission_context): New helper function.
  * lib/get-permissions.c (get_permissions): New helper function split off
  from qcopy_acl.
  * lib/set-permissions.c: (set_acls_from_mode): On Solaris, Cygwin, and
  AIX, set a file's permissions based only on a file mode.
  (acl_from_mode, context_acl_from_mode, context_aclv_from_mode): All
  other platforms construct a temporary acl from the file mode and set
  that acl in the same way as setting an acl read from the source file.
  This should help avoid code duplication and inconsistent / buggy
  behavior.
  (set_acls): New helper function Split off from qcopy_acl.
  (chmod_or_fchmod): Moved here from qset-acl.c.
  (set_permissions): New helper function.
  * lib/qcopy-acl.c (qcopy_acl): Rewrite using get_permissions and
  set_permissions.
  * lib/qset-acl.c (qset_acl): Rewrite using set_permissions.
  * modules/qacl: Add get-permissions.c and set-permissions.c.
  

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• lib/qset-acl.c

• /* qset-acl.c - set access control list equivalent to a mode
  
     Copyright (C) 2002-2003, 2005-2015 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program 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 General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  
     Written by Paul Eggert and Andreas Gruenbacher, and Bruno Haible.  */
  
  #include <config.h>
  
  #define ACL_INTERNAL_INLINE _GL_EXTERN_INLINE
  
  #include <string.h>
  #include "acl.h"
  
  #include "acl-internal.h"
  
  
  /* Set the access control lists of a file. If DESC is a valid file
     descriptor, use file descriptor operations where available, else use
     filename based operations on NAME.  If access control lists are not
     available, fchmod the target file to MODE.  Also sets the
     non-permission bits of the destination file (S_ISUID, S_ISGID, S_ISVTX)
     to those from MODE if any are set.
     Return 0 if successful.  Return -1 and set errno upon failure.  */
  
  int
  qset_acl (char const *name, int desc, mode_t mode)
  {
    struct permission_context ctx;
    int ret;
  
    memset (&ctx, 0, sizeof ctx);
    ctx.mode = mode;
    ret = set_permissions (&ctx, name, desc);
    free_permission_context (&ctx);
    return ret;
  }
  

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