#!/usr/bin/env python
     #
     # Copyright 2007 Doug Hellmann.
     #
     #
     #                         All Rights Reserved
     #
     # Permission to use, copy, modify, and distribute this software and
     # its documentation for any purpose and without fee is hereby
     # granted, provided that the above copyright notice appear in all
     # copies and that both that copyright notice and this permission
     # notice appear in supporting documentation, and that the name of Doug
     # Hellmann not be used in advertising or publicity pertaining to
     # distribution of the software without specific, written prior
     # permission.
     #
     # DOUG HELLMANN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
     # INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
     # NO EVENT SHALL DOUG HELLMANN BE LIABLE FOR ANY SPECIAL, INDIRECT OR
     # CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
     # OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
     # NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     #
     
     """Using the os module to find information about the user running the current process.
     
     """
     
     __module_id__ = "$Id$"
     #end_pymotw_header
     
     import os
     
     TEST_GID=501
     TEST_UID=527
     
     def show_user_info():
         print 'Effective User  :', os.geteuid()
         print 'Effective Group :', os.getegid()
         print 'Actual User     :', os.getuid(), os.getlogin()
         print 'Actual Group    :', os.getgid()
         print 'Actual Groups   :', os.getgroups()
         return
     
     print 'BEFORE CHANGE:'
     show_user_info()
     print
     
     try:
         os.setegid(TEST_GID)
     except OSError:
         print 'ERROR: Could not change effective group.  Re-run as root.'
     else:
         print 'CHANGED GROUP:'
         show_user_info()
         print
     
     try:
         os.seteuid(TEST_UID)
     except OSError:
         print 'ERROR: Could not change effective user.  Re-run as root.'
     else:
         print 'CHANGE USER:'
         show_user_info()
         print