From: Scott McNab <scott.mcnab@...>
Date: 2007-06-05T21:30:30+09:00
Subject: Re: Process::GID.change_privilege not changing groups proper

Brian Candler wrote:
> Try using Process.initgroups

Thanks Brian that fixed it!

> If you look at the source code to su, you'll probably find it calls
> initgroups() somewhere.

Actually you were spot on. The source in su.c (in the coreutils package) 
does exactly that:

/* Become the user and group(s) specified by PW.  */

static void
change_identity (const struct passwd *pw)
{
#ifdef HAVE_INITGROUPS
 errno = 0;
 if (initgroups (pw->pw_name, pw->pw_gid) == -1)
   error (EXIT_FAIL, errno, _("cannot set groups"));
 endgrent ();
#endif
 if (setgid (pw->pw_gid))
   error (EXIT_FAIL, errno, _("cannot set group id"));
 if (setuid (pw->pw_uid))
   error (EXIT_FAIL, errno, _("cannot set user id"));
}

Now, all we need is to get this fix incorporated into the Mongrel gem 
source tree...

Regards
Scott

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