From: Mark H Weaver <mhw@netris.org>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: Brendan Tildesley <btild@mailbox.org>, 36508@debbugs.gnu.org
Subject: bug#36508: GDM files have incorrect owner after temporarily removing service
Date: Thu, 15 Apr 2021 14:58:16 -0400 [thread overview]
Message-ID: <87eefbidcs.fsf@netris.org> (raw)
In-Reply-To: <875z0pgnqn.fsf@gnu.org>
Ludovic Courtès <ludo@gnu.org> writes:
> Mark H Weaver <mhw@netris.org> skribis:
>
>> Here's one idea: when activating a system, *never* delete users or
>> groups if files still exist that are owned by those users/groups.
>> Checking all filesystems would likely be too expensive, but perhaps it
>> would be sufficient to check certain directories such as /var, /etc, and
>> possibly the top directory of /home.
>
> How would you determine which directories to look at though? What if we
> miss an important one?
I have another idea:
Maintain historical mappings from user/group names to UIDs/GIDs, perhaps
in some file in /etc, where entries are added but *never* automatically
removed. When allocating UIDs/GIDs, we would avoid any UIDs/GIDs in the
range of those mappings.
Then, provide a UID/GID garbage collector, to be explicitly run by users
if desired, which would scan all filesystems to find the set of UID/GIDs
currently referenced, and remove entries from the historical mappings
that are no longer needed.
What do you think?
Mark
next prev parent reply other threads:[~2021-04-15 19:01 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-05 8:36 bug#36508: GDM files have incorrect owner after temporarily replacing with SDDM ison
2021-04-13 13:24 ` bug#36508: GDM files have incorrect owner after temporarily removing service Brendan Tildesley via Bug reports for GNU Guix
2021-04-13 20:51 ` Mark H Weaver
2021-04-14 4:31 ` Brendan Tildesley via Bug reports for GNU Guix
2021-04-15 18:09 ` Mark H Weaver
2021-04-14 10:32 ` Ludovic Courtès
2021-04-14 12:21 ` Brendan Tildesley via Bug reports for GNU Guix
2021-04-15 14:24 ` Ludovic Courtès
2021-04-15 18:30 ` Mark H Weaver
2021-04-15 20:05 ` Ludovic Courtès
2021-04-15 22:22 ` Mark H Weaver
2021-04-16 15:18 ` Ludovic Courtès
2021-04-17 16:16 ` Mark H Weaver
2021-04-15 23:04 ` Mark H Weaver
2021-04-16 15:14 ` Ludovic Courtès
2021-04-15 18:35 ` Mark H Weaver
2021-04-15 18:58 ` Mark H Weaver [this message]
2021-04-16 10:42 ` Maxime Devos
2021-04-17 16:28 ` Mark H Weaver
2022-09-18 12:22 ` bug#36508: [DRAFT PATCH] Stable allocation of uids, by keeping a historical mapping Maxime Devos
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