[bug#60069] [PATCH 2/2] guix-install.sh: Directly exit in case of errors in chk_require.

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hi Ludovic,

Ludovic Courtès <ludo@gnu.org> writes:

> Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:
>
>> The need for this use case appeared when attempting to install Guix on a truly
>> minimal image made with Buildroot, which lacked enough GNU components that I
>> had to extract a guix pack to /gnu before attempting installation, which would
>> then refuse to proceed because of the existing /gnu.
>>
>> * etc/guix-install.sh: Document environment variables.
>> (sys_create_store) [GUIX_ALLOW_OVERWRITE]: Skip pre-existing installation
>> checks and output a warning.  Extract the tarball directly to /.
>
> Like Tobias, I’m reluctant to adding environment variables; I’m also
> skeptical about the use case (I think it’s fine to let users remove
> their previous installation if that’s what they want).

Removing my previous installation wouldn't have helped (it would have
cleared the guix packs I needed to be able to run the installer).
Without this change, I wouldn't have been able to install guix using
guix-install.sh.  It's niche, but I bet it'd help folks trying to
install Guix on Alpine and similar minimal OSes.

> I also think we’d rather minimize changes to the script since we’re a
> couple of days before the release.

The change seems fairly small to me and would be easy to revert if it
causes a problem.  But I'll let you do the call, given you're the one
pushing the release forward (thank you!).

-- 
Thanks,
Maxim