From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Tip of the day: storing your GuixSD config in the instantiated
	system
Date: Wed, 30 Aug 2017 00:20:55 +0200
Message-ID: <87mv6iow1k.fsf@gnu.org>
References: <871snzfl4s.fsf@gnu.org> <877exmhegq.fsf@elephly.net>
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In-Reply-To: <877exmhegq.fsf@elephly.net> (Ricardo Wurmus's message of "Tue,
	29 Aug 2017 12:10:13 +0200")
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To: Ricardo Wurmus <rekado@elephly.net>
Cc: help-guix <help-guix@gnu.org>

Ricardo Wurmus <rekado@elephly.net> skribis:

> Ludovic Court=C3=A8s <ludo@gnu.org> writes:
>
>> 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-loc=
ation)
>>                                                      '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.
>
> When the system is =E2=80=9Cchecked out=E2=80=9D during boot, would it fa=
il when
> /etc/config.scm already exists?  It certainly won=E2=80=99t just overwrit=
e an
> existing /etc/config.scm.

Right, I think it=E2=80=99d fail gracelessly.

> 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=E2=80=99s home directory (or similar), rather than recom=
mending
> the file to be placed in /etc.

Yeah, it sounds like claiming this specific name, /etc/config.scm, is
likely to cause problems.  Unless the documentation for the new service
insists on it?

And yes, we should recommend putting config files under version-control,
regardless of whether we add this new service.

Ludo=E2=80=99.