How to add service(s) from a service?

[Tomas Volf <wolf@wolfsden.cz>]

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Hi Guix,

I know that I can add services into my Guix configuration using this pattern:

    (operating-system
      ...
      (services (cons* SERVICE
                       %base-services)))

And for packages I can use this pattern:

    (operating-system
      ...
      (packages (cons* PACKAGE
                       %base-packages)))

Now, I would like to be able to do both from a service.  I now that the packages
I do using the profile-service-type, like this:

(define my-service-service-type
  (service-type
   (name 'my-service)
   (description "This is my service.")
   (extensions
    (list (service-extension profile-service-type (list PACKAGE))))
   (default-value (my-service-configuration))))

However, I am unsure how to do this for services.  Would anyone have any ideas
how to do this?

Thank you and have a nice day,
Tomas Volf

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

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