bug#27889: Polkit actions are not updated after guix system reconfigure

[ludo@gnu.org (Ludovic Courtès)]

Hello,

Danny Milosavljevic <dannym@scratchpost.org> skribis:

> But gnu/services/shepherd.scm shepherd-service-file could be extended to provide a "restart" action (shepherd itself already supports it).
>
> The general format for shepherd is:
>
> (register-services
>   (make <service>
>         #:provides '(apache-2.0 apache httpd)
>         #:requires '()
>         #:start (...)
>         #:stop (...)
>         #:actions (make-actions
>                    (restart (...)))))
>                     ^^^^^^^^^^^^^
>
> But the Guix <shepherd-service> record, which is the source that is eventually compiled to the above, neither has an "actions" slot nor a "restart" slot.  It would have to be extended with one.
>
> I wonder whether it would make sense to make shepherd automatically default to a SIGHUP restart action for daemonized processes instead, though.  It's not exactly rare for daemons to provide that.
>
> Also, does "guix system reconfigure" already call this restart action if it's present?

Not yet, but it should.  I think the patches at
<https://bugs.gnu.org/26830> would be sufficient if the action boils
down to sending SIGHUP.  Perhaps time to revive that patch set!

Ludo’.