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

[Ryan Moe]

On Mon, Jul 31, 2017 at 2:34 PM, Danny Milosavljevic
<address@hidden> wrote:
> Oops!
>
> That's indeed still broken.
>
> 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?

polkitd isn't managed by shepherd. It looks to be managed by dbus and
I'm not sure how to restart an individual dbus service (or if you even
can). Restarting dbus-system is obviously too intrusive (it does
reload the policy files at the expense of restarting my X session :)).