Re: Modular home configuration

[Edouard Klein]

The magic is here 
<https://gitlab.com/edouardklein/guix/-/blob/beaverlabs/beaver/functional-home-services.scm?ref_type=heads>

Le 9 novembre 2024 18:35:10 GMT+01:00, Ian Eure <ian@retrospec.tv> a écrit :
>Hi folks,
>
>I’m trying to make my home configuration more modular, so I can better support 
>system variances.  For example, I have a laptop I use interactively, and a 
>headless machine that runs Cuirass.  It’s advantageous to share certain 
>aspects of the home configuration between the two machines (shell 
>prompt/environment, GPG agent, etc), but not others (anything X11/graphical 
>stuff shouldn’t be on the build machine).  One approach to this is to define 
>packages and services and reference them in the home configuration.  What I 
>dislike about this is that many things require both packages and services, and 
>I’d prefer to have a way to completely encapsulate that -- for example, the 
>mpd-mpc package to control my music server, plus a 
>home-environment-variables-service-type to set MPD_HOST.
>
>I attempted to solve this by writing a procedure:
>
>   (define (+mpd-client home-config)
>     (home-environment
>       (inherit home-config)
>       (packages (cons mpd-mpc (home-environment-packages        home-config)))
>       (services
>         (cons
>           (simple-service
>             'mpd-environment-service
>             home-environment-variables-service-type
>             '(("MPD_HOST" . "audio.box")))
>           (home-environment-services home-config)))))
>
>Which I can then wrap around a home-environment to add the mpd-mpc package and 
>environment variable it needs to work:
>
>   (+mpc-client (home-environment ...))
>
>Surprisingly, this doesn’t work -- it complains that there’s more than one 
>"home" service type.  I’m not sure why that is, and I haven’t been able to see 
>anything obviously wrong in the REPL -- though I haven’t been able to get my 
>actual home configuration up in the Emacs-Guix REPL, due to #67290.
>
>Does anyone have a suggestion for a workaround for this issue, explanation of 
>how two home services are ending up in the config, or a better approach for 
>building modular home configs?
>
>Thanks,
>
> — Ian
>