Re: Service customization

[Alex Kost]

Ludovic Courtès (2015-10-29 00:33 +0300) wrote:

> Hi Guix!
>
> A fairly common pattern in GuixSD is: You want to use whatever is in
> ‘%desktop-services’, say, but you want to tweak the configuration of
> some of the services in there.
>
> This is where the ‘modify-services’ macro comes in, inspired by Taylan’s
> ‘modify-phases’:
>
>      Occasionally, instead of using the base services as is, you will want
>   to customize them.  For instance, to change the configuration of
>   ‘guix-daemon’ and Mingetty (the console log-in), you may write the
>   following instead of %BASE-SERVICES:
>
>        (modify-services %base-services
>          (guix-service-type config =>
>                             (guix-configuration
>                              (inherit config)
>                              (use-substitutes? #f)
>                              (extra-options '("--gc-keep-outputs"))))
>          (mingetty-service-type config =>
>                                 (mingetty-configuration
>                                  (inherit config)
>                                  (motd (plain-file "motd" "Hi there!")))))
>
>   The effect here is to change the options passed to ‘guix-daemon’ when it
>   is started, as well as the “message of the day” that appears when
>   logging in at the console.  *Note ‘modify-services’: Service Reference,
>   for more on that.
>
> Simple but convenient, no?

This is awesome!  Thank you!!

-- 
Alex