[bug#60068] bug#60069: [PATCH 2/2] guix-install.sh: Directly exit in case of errors in chk_require.

[Ludovic Courtès]

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).

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

Thanks,
Ludo’.