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 Sun, Apr 19, 2020 at 01:33:07AM +0200, Ludovic Courtès wrote:
> Hi,
> 
> Efraim Flashner <efraim@flashner.co.il> skribis:
> 
> > On Fri, Apr 17, 2020 at 11:00:49PM +0200, Ludovic Courtès wrote:
> 
> [...]
> 
> >> > --- 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
> 
> Right, it’s not available in Guix <shepherd-service>.
> 
> However, simplify adding ‘xorg-server’ to ‘provision’ should have the
> desired effect: ‘guix system’ errors out if more than one service
> provides the same symbol.
> 
> >> 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.
> 
> Yeah, maybe it’s safer to keep it.
> 
> Thanks,
> Ludo’.

Sounds good. I put xorg-server first so it more closely matches with the
other ones.

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