text: /* Determine whether we can write any file.
  
     Copyright (C) 2007, 2009-2018 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 <https://www.gnu.org/licenses/>.  */
  
  /* Written by Paul Eggert.  */
  
  #include <config.h>
  
  #include "write-any-file.h"
  #include "priv-set.h"
  #include "root-uid.h"
  
  #include <unistd.h>
  
  /* Return true if we know that we can write any file, including
     writing directories.  */
  
  bool
  can_write_any_file (void)
  {
    static bool initialized;
    static bool can_write;
  
    if (! initialized)
      {
        bool can = false;
  #if defined PRIV_FILE_DAC_WRITE
        can = (priv_set_ismember (PRIV_FILE_DAC_WRITE) == 1);
  #else
        /* In traditional Unix, only root can unlink directories.  */
        can = (geteuid () == ROOT_UID);
  #endif
        can_write = can;
        initialized = true;
      }
  
    return can_write;
  }
  