[bug#40680] [PATCH] service: sddm: Have sddm-service-type conflict with other display managers.

[Efraim Flashner <efraim@flashner.co.il>]

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On Fri, Apr 17, 2020 at 11:00:49PM +0200, Ludovic Courtès wrote:
> Hi Efraim,
> 
> Efraim Flashner <efraim@flashner.co.il> skribis:
> 
> > * gnu/services/sddm.scm (sddm-shepherd-service)[shepherd-service]:
> > Conflict with 'xorg-server.
> > ---
> >
> > I was looking over the services list with raingloom on IRC and I noticed
> > that GDM and Slim both provision xorg-server, while SDDM provisions
> > display-manager. To ensure that they conflict with each other we can
> > either:
> >
> > A: Have SDDM conflict with 'xorg-server
> >
> > B: Have SDDM also provision 'xorg-server
> >
> > I'm currently using SDDM (in Wayland mode) to launch an X session of
> > Enlightenment, so I think it's safe enough to say that SDDM can
> > provision 'xorg-server.
> >
> > ---
> >
> >  gnu/services/sddm.scm | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/gnu/services/sddm.scm b/gnu/services/sddm.scm
> > index 1921afce95..aa08859513 100644
> > --- a/gnu/services/sddm.scm
> > +++ b/gnu/services/sddm.scm
> > @@ -171,6 +171,7 @@ Relogin="              (if (sddm-configuration-relogin? config)
> >           (documentation "SDDM display manager.")
> >           (requirement '(user-processes))
> >           (provision '(display-manager))
> > +         (conflicts-with '(xorg-server))
> 
> ‘conflicts-with’ doesn’t exist, right?  :-)
> 

I haven't tried it out for Guix services, but it exists for shepherd
services, according to the manual¹

> But yes, I think (provision '(xorg-server display-manager)) would be
> fine.
> 
> Or we can even drop ‘display-manager’ since it’s not used anywhere else.

Normally I'd be skeptical about dropping it since people might expect it
if they're using sddm, but it'd probably be fine.


¹ https://www.gnu.org/software/shepherd/manual/html_node/Methods-of-services.html#Methods-of-services

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