Re: Tip of the day: storing your GuixSD config in the instantiated system

[Ricardo Wurmus <rekado@elephly.net>]

Ludovic Courtès <ludo@gnu.org> writes:

> But wait: we can already store the config file in the instantiated
> system!  Here’s how:
>
>   (operating-system
>     ;; …
>     (services (cons (simple-service 'store-my-config
>                                     etc-service-type
>                                     `(("config.scm"
>                                        ,(local-file (assoc-ref
>                                                      (current-source-location)
>                                                      'filename)))))
>                     …)))
>
> You instantiate that, and then /etc/config.scm (aka.
> /run/current-system/etc/config.scm,
> aka. /var/guix/profiles/system/etc/config.scm) contains the config file.

When the system is “checked out” during boot, would it fail when
/etc/config.scm already exists?  It certainly won’t just overwrite an
existing /etc/config.scm.

Also, this $profile/etc/config.scm would be read-only.  So far we have
encouraged people to store their configuration file at /etc/config.scm.
If this service became a default then we probably should encourage
people to store their system config file template under version control
in the root user’s home directory (or similar), rather than recommending
the file to be placed in /etc.

--
Ricardo

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