test if primary group, with only implicit membership of the user?

To: debian-devel@lists.debian.org
Subject: test if primary group, with only implicit membership of the user?
From: "C. Gatzemeier" <c.gatzemeier@tu-bs.de>
Date: Fri, 28 May 2010 01:00:45 +0200
Message-id: <20100528010045.653c9121c.gatzemeier@tu-bs.de@tu-bs.de>
In-reply-to: <20100525220935.201d11b8c.gatzemeier@tu-bs.de@tu-bs.de>
References: <20100525220935.201d11b8c.gatzemeier@tu-bs.de@tu-bs.de>

> 
> 2) A special case is true: The group is set as the main group of the
>    user (in /etc/passwd) while the user is NOT added to his group
>    in /etc/groups.

May pam_umask test this, for umask relaxation?

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Follow-Ups:
- Re: test if primary group, with only implicit membership of the user?
  - From: Roger Leigh <rleigh@codelibre.net>

References:
- The story behind UPG and umask.
  - From: "C. Gatzemeier" <c.gatzemeier@tu-bs.de>

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