Hi,

This question comes up often on #guix.

Nicolas Graves via Development of GNU Guix and the GNU System
distribution. schreef op zo 09-01-2022 om 21:44 [+0100]:
> Hi !
> 
> New user of guix for a few months, still getting used to everything.
> Don't hesitate to advise me if I'm doing anything wrong ;)
> 
> I find myself often waiting for heavy packages (ungoogled-chromium,
> cargo...) to be built as substitutes before updating my system and I
> find it a bit long to my personal taste.

Potential problem: there are packages that fail to build.

> Would it be possible to add a branch in guix sources following only
> available substitutes, so that each time I pull, I can immediatly
> and quickly update. Or would that need to stay as someone's personal
> project ?
> 
> Doesn't seem to complicated on principle, with guix weather and a
> cron job.

Short answer: yes, but someone has to not just ask whether it's
possible or tell it ‘should be easy’, and actually implement all this.
Also, have a look at channel-with-substitutes-available.
It's not sufficiently general for your use case though.

Greetings,
Maxime.