Jone <yeger9@gmail.com> writes:

> (use-modules
>  ...
> (gnu services mcron)        ;; ← manual
>  ...
> (define fstrim-job              ;; ← manual
>   #~(job "10 10 * * 6"
>          "fstrim -a"))
> ...
> (services (cons*
>  ...
>   (mcron-service-type (mcron-configuration (jobs (list fstrim-job))))  ;; ←
> but here the question
>  ...

Did you use `mcron-service' around `mcron-service-type'?

>  ...
> (mcron-service (mcron-configuration (jobs (list fstrim-job))))  ;; ← manual
>  ...

`mcron-service' takes a list of jobs as argument, not an mcron-configuration.

From the manual:


--8<---------------cut here---------------start------------->8---
 -- Scheme Procedure : mcron-service JOBS [#:mcron MCRON]
     Return an mcron service running MCRON that schedules JOBS, a list
     of gexps denoting mcron job specifications.

     This is a shorthand for:
          (service mcron-service-type
                   (mcron-configuration (mcron mcron) (jobs jobs)))
--8<---------------cut here---------------end--------------->8---

So for you needs you'd need something like:

--8<---------------cut here---------------start------------->8---
(services (cons*
  (mcron-service (list fstrim-job))
  ...)
--8<---------------cut here---------------end--------------->8---

Hope that helps! :)

-- 
Pierre Neidhardt

Sorry, no fortune this time.