From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Bavier <ericbavier@openmailbox.org>
Subject: Re: grub.cfg.drv gets rebuilt
Date: Tue, 16 Aug 2016 00:28:53 -0500
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To: Vincent Legoll <vincent.legoll@gmail.com>
Cc: help-guix <help-guix@gnu.org>

On Mon, 15 Aug 2016 17:33:09 +0200
Vincent Legoll <vincent.legoll@gmail.com> wrote:

> I'm wondering if it's normal to have *-grub.cfg.drv rebuilt on
> successive "guix system reconfigure", when nothing has
> changed between first and subsequent runs.
> 
> Is this reproducible on your GuixSD systems ?
> 
> root@guixsd /etc# guix system reconfigure /etc/config.scm
> The following derivation will be built:
>    /gnu/store/786b130gin8jrhksbwfimpi2xjnc2fsd-grub.cfg.drv
> /gnu/store/j05dqpaj3ln3s512nzp39i4nzrpfxwaf-system
> /gnu/store/900qjchmspy9iyxyzz48bw2sh5k861nq-grub.cfg
> /gnu/store/gka9rl2k8mqqi27rrvjpgz6yw165d3if-grub-2.02beta3
> activating system...
> setting up setuid programs in '/run/setuid-programs'...
> populating /etc from /gnu/store/lwvwgajp7yigf8hmwm56wvf5rh94i5hm-etc...
> usermod: no changes
> usermod: no changes
> usermod: no changes
> making '/gnu/store/j05dqpaj3ln3s512nzp39i4nzrpfxwaf-system' the
> current system...
> Installing for i386-pc platform.
> Installation finished. No error reported.
> 
> root@guixsd /etc# guix system reconfigure /etc/config.scm
> The following derivation will be built:
>    /gnu/store/l4lsqqyncz8pq5w4hqjsl49rydjfqwb8-grub.cfg.drv
> /gnu/store/j05dqpaj3ln3s512nzp39i4nzrpfxwaf-system
> /gnu/store/wb836hy9adib0phxvzzcdigvhmvaq52d-grub.cfg
> /gnu/store/gka9rl2k8mqqi27rrvjpgz6yw165d3if-grub-2.02beta3
> activating system...
> setting up setuid programs in '/run/setuid-programs'...
> populating /etc from /gnu/store/lwvwgajp7yigf8hmwm56wvf5rh94i5hm-etc...
> usermod: no changes
> usermod: no changes
> usermod: no changes
> making '/gnu/store/j05dqpaj3ln3s512nzp39i4nzrpfxwaf-system' the
> current system...
> Installing for i386-pc platform.
> Installation finished. No error reported.
> 

The grub configuration generates menu entries for each invocation of
'guix system reconfigure' to enable system roll-backs during boot-up,
so it is always updated.  The thing that's "changed" is the menu
entries.

`~Eric