bug#37380: gdm doesn't load pam-limits

[Jesse Gibbons]

Thanks Ricardo,
On Wed, 2019-09-11 at 21:48 +0200, Ricardo Wurmus wrote:
> Hi Jesse,
> 
> > I have been trying to set up ardour, but jackd doesn't start in
> > real-
> > time mode. I made an os definition that replicates this issue when
> > I
> > use a VM[0].
> > [0] https://lists.gnu.org/archive/html/help-guix/2019-09/msg00065.h
> > tml
> > I asked the gnome and gdm IRC and found out gdm loads the gdm-
> > password
> > pam config, which seems untouched by pam-limits-service. My
> > /etc/pam.d/gdm-password (which should be the default) is attached.
> 
> I can reproduce this.
> 
> (I’m sorry for accidentally misleading you earlier.  Turns out I used
> JACK a little longer ago than I initially realized.)
So was there a time when JACK worked realtime after logging in from gdm
on a GuixSD install?
> 
> I think it should be pretty easy to fix this:
> 
> 1) we should generate a single file that is used for generic session
> settings.
What should be this file's default contents? Should it be empty unless
the pam-limits-service is specified?
> 
> 2) all login programs (including gdm) should include that file in
> their
> PAM settings.
I suppose this could be done by adding
(pam-entry
 (control "include")
 (module "standard-session"))

I'm not sure "module" is a good word to describe the file.
> 
> 3) the pam-limits-service should extend that single file instead of
> attempting to update a bunch of PAM files for a selected list of
> programs.
Should this file be a part of base-services?
> --
> Ricardo
> 
I have to go to work soon, but I hope I can have this accomplished with
a patch series ready by Saturday. I'll check in with a status update
Saturday evening UTC -6.
-- 
-Jesse