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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Tip of the day: storing your GuixSD config in the instantiated system
Date: Fri, 25 Aug 2017 22:27:47 +0200
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Hello Guix!

Following a discussion we had at the GHM today, here=E2=80=99s the tip of t=
he day!

People often ask how they could store their GuixSD config alongside the
instantiated system in the store.  Guix maintainers usually grumpily
reply =E2=80=9Cnah, don=E2=80=99t do this, because the config file is not
self-contained, so that=E2=80=99s not good enough.=E2=80=9D

But wait: we can already store the config file in the instantiated
system!  Here=E2=80=99s how:

  (operating-system
    ;; =E2=80=A6
    (services (cons (simple-service 'store-my-config
                                    etc-service-type
                                    `(("config.scm"
                                       ,(local-file (assoc-ref
                                                     (current-source-locati=
on)
                                                     'filename)))))
                    =E2=80=A6)))

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.

Pretty neat no?

Enjoy!

Ludo=E2=80=99.