How to add the timer-trigger-action to a shepherd service?

How to add the timer-trigger-action to a shepherd service?

[Tomas Volf]

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Hello,

I am trying to use the new shepherd timers in my guix configuration.  I
got it working with some help on IRC, except I cannot figure out how to
configure the extra action.  Shepherd's manual gives this example:

--8<---------------cut here---------------start------------->8---
     (define updatedb
       (service
         '(updatedb)
         #:start (make-timer-constructor
                   ;; Fire at midnight and noon everyday.
                   (calendar-event #:hours '(0 12) #:minutes (0))
                   (command '("/usr/bin/updatedb"
                              "--prunepaths=/tmp")))
         #:stop (make-timer-destructor)
         #:actions (list timer-trigger-action)))
--8<---------------cut here---------------end--------------->8---

However I cannot figure out what to put into the (actions) field of the
shepherd-service record.  Documentation says it should be instance of
shepherd-action, however I have no idea how to turn the
timer-trigger-action into it.  Any suggestions?

Thanks,
Tomas

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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Re: How to add the timer-trigger-action to a shepherd service?

[Felix Lechner via]

Hi Tomas,

On Mon, Dec 16 2024, Tomas Volf wrote:

> what to put into the (actions) field

Please try this:

   (actions
    (list (shepherd-action
           (name 'trigger)
           (documentation "Trigger the action associated with this timer.")
           (procedure #~(identity trigger-timer)))))

You can see my full timer definitions here. [1]

Kind regards
Felix

[1] https://codeberg.org/lechner/system-config/src/commit/4335818ba8da818f21810b5b402db51c77d3b344/host/wallace-server/operating-system.scm#L660-L664

Re: How to add the timer-trigger-action to a shepherd service?

[Jake]

Hi Tomas

I got the snippet below from the patch series
https://issues.guix.gnu.org/74860

   (actions (list (shepherd-action
                   (name 'trigger)
                   (documentation "Trigger something.")
                   (procedure #~trigger-timer))))

Cheers
Jake



On Mon, Dec 16, 2024 at 10:54 PM Tomas Volf <~@wolfsden.cz> wrote:

>
> Hello,
>
> I am trying to use the new shepherd timers in my guix configuration.  I
> got it working with some help on IRC, except I cannot figure out how to
> configure the extra action.  Shepherd's manual gives this example:
>
> --8<---------------cut here---------------start------------->8---
>      (define updatedb
>        (service
>          '(updatedb)
>          #:start (make-timer-constructor
>                    ;; Fire at midnight and noon everyday.
>                    (calendar-event #:hours '(0 12) #:minutes (0))
>                    (command '("/usr/bin/updatedb"
>                               "--prunepaths=/tmp")))
>          #:stop (make-timer-destructor)
>          #:actions (list timer-trigger-action)))
> --8<---------------cut here---------------end--------------->8---
>
> However I cannot figure out what to put into the (actions) field of the
> shepherd-service record.  Documentation says it should be instance of
> shepherd-action, however I have no idea how to turn the
> timer-trigger-action into it.  Any suggestions?
>
> Thanks,
> Tomas
>
> --
> There are only two hard things in Computer Science:
> cache invalidation, naming things and off-by-one errors.
>