On 2024-03-24 22:20, Ludovic Courtès wrote:
> Hello Guix!
>
> I pushed to the ‘devel’ branch of the Shepherd a new module that
> implements “timers” along with ‘herd’ support to display information
> about them.
>
> It lets you provide configuration like this one:
>
> --8<---------------cut here---------------start------------->8---
> (use-modules (shepherd service timer))
>
> (define timer
> (service '(my-timer)
> #:start (make-timer-constructor
> (calendar-event #:seconds '(0 7 15 22 30 45))
> (command '("sh" "-c" "echo Hi from $PWD.; sleep 20; echo
> done")))
> #:stop (make-timer-destructor)))
>
> (register-services (list timer))
> (start-in-the-background '(my-timer))
> --8<---------------cut here---------------end--------------->8---
>
> And then ‘my-timer’ invokes the given command at the moments that match
> the constraints defined by ‘calendar-event’—in this case any time the
> number of seconds is equal to 0, 7, 15, 22, 30, or 45. You can also
> make it every Monday at 9AM etc., as you would expect.
>
> The ‘herd’ command provides details information about the timer:
>
> --8<---------------cut here---------------start------------->8---
> $ ./herd -s sock status my-timer
> Status of my-timer:
> It is running since 21:09:32 (68 seconds ago).
> Timed service.
> Periodically running: sh -c "echo Hi from $PWD.; sleep 20; echo done".
> Child process: 1814
> It is enabled.
> Provides (my-timer).
> Requires ().
> Will not be respawned.
>
> Recent runs:
> 2024-03-24 21:10:04 Process exited successfully.
> 2024-03-24 21:10:19 Process exited successfully.
> 2024-03-24 21:10:26 Process exited successfully.
> 2024-03-24 21:10:34 Process exited successfully.
> 2024-03-24 21:10:35 Process terminated with signal 15.
>
> Recent messages:
> 2024-03-24 21:10:29 Hi from /home/ludo.
>
> Upcoming timer alarms:
> 21:10:45 (in 5 seconds)
> 21:11:00 (in 20 seconds)
> 21:11:07 (in 27 seconds)
> 21:11:15 (in 35 seconds)
> 21:11:22 (in 42 seconds)
> --8<---------------cut here---------------end--------------->8---
>
> And of course you can do anything you can do with a service: stop it,
> unload it, load a replacement, and so on.
>
> Feedback & suggestions welcome!
>
> Ludo’.
Does it support RTC wakeup?
