On Wed, Jun 21, 2023 at 10:43 AM TOMAS FABRIZIO ORSI <torsi@fi.uba.ar> wrote:
>>
>> Sure, I think it could work.
>
> Great to hear.
> In that case I could try to give it a try and make a pull request to the emerge --sync with a basic idea.
> Any tips?

So emerge already emits a warning message when a repo is missing:

https://gitweb.gentoo.org/proj/portage.git/tree/lib/portage/repository/config.py?h=portage-3.0.48.1#n1070

That looks something like this:

$ sudo emerge --sync
Unavailable repository 'foo' referenced by masters entry in
'/var/db/repos/gentoo/metadata/layout.conf'