Bug#1016500: README.Debian documents KillUserProcesses but not Linger

[chrysn]

On Tue, Aug 02, 2022 at 08:30:48AM +0200, Michael Biebl wrote:
> We only document KillUserProcesses=yes in README.Debian as we deviate from
> the upstream defaults here.

The text does both: It documents the deviation and warns users of
possibly unexpected behavior.

> 
> > > The default Linger value for users is set to "no", and may need to be
> > > altered with `loginctl enable-linger ${USER}` to keep screen and tmux
> > > useful.
> 
> This reads like there would be a "Linger=yes/no" value in logind.conf, which
> is misleading.

Wording should be improved then; I didn't manage to find out where these
things are actually stored -- but let's look at whether a change is
indicated first:

> It is also incorrect, as you don't need to enable lingering if you want tmux
> to survive a log out (which was the reason for setting KillUserProcesses=no
> in Debian). Then again, I don't understand what you mean by "keep useful"?

It appears it does need to be enabled. At least that was the
recommendation in [1016475]. The original [946645], while confirming
that this happens, did not manage to find where precisely it is coming
from, but enabling lingering was a working fix.

I lack the big picture of all the interworking components around logind,
but the observation confirmed both in these issues and also outside of
Debian[1] ("To fix, do *all* of the following steps") is that at least
in some circumstances (such as when following the steps outlined in the
two referenced issues), just having KillUserProcesses=no is
insufficient.

BR
c

[1]: https://superuser.com/questions/1372963/how-do-i-keep-systemd-from-killing-my-tmux-sessions
[946645]: https://bugs.debian.org/946645
[1016475]://bugs.debian.org/1016475

-- 
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