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Date: Mon, 11 Mar 2024 17:56:59 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Switching groups with newgrp - how to get the new group with
 |GetTokenInformation()| ?
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On Mar 11 02:28, Dan Shelton via Cygwin wrote:
> On Wed, 6 Mar 2024 at 14:01, Corinna Vinschen via Cygwin
> <cygwin@cygwin.com> wrote:
> > On Mar  5 23:38, Dan Shelton via Cygwin wrote:
> > > Always editing /etc/nsswitch.conf
> > > forth and back is not a elegant solution, aside from race conditions
> > > with other users on a system
> >
> > So, here we go again.
> >
> > - What exactly are you trying to accomplish by enumerating the accounts?
> >   Maybe you won't actually need it for your task at hand.
> 
> We're trying to do several things, including but not limited to:
> - Finding which local groups exist. Part of our customer software
> expects that certain groups exist. Unfortunately the group names vary
> between installations, and sometimes names are prefixed with site
> names. Trying to do all permutations with just getent passwd
> $iteration means too many combinations (>= 4000000). So just
> enumerating all local groups with getent group would be the way to go.

Then just change /etc/nsswitch.conf to enumerate "local" as well
and be done with it.

You can even go so far as to use the Windows enumerator, i.e.,

  $ net localgroup

and than script it to use its output as input to getent group
for only the groups you really need info for.


Corinna