#26608 - Provide --only-substitutes flag to "guix package --upgrade"

Package	Source(s)		Maintainer(s)
guix		PTS Buildd Popcon

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From: Ricardo Wurmus <rekado@elephly.net>
To: Ludovic Courtès <ludo@gnu.org>
Subject: Re: bug#32022: bug#22629: “Stable” branch
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Cc: 26608@debbugs.gnu.org, 22629@debbugs.gnu.org,
 Alex Sassmannshausen <alex@pompo.co>, 32022@debbugs.gnu.org
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Ludovic Courtès <ludo@gnu.org> writes:

> I just had a bright idea (yes!): this can be addressed by writing
> something like this in ~/.config/guix/channels.scm:
>
>   (map latest-commit-with-substitutes-available
>        %default-channels)
>
> The hypothetical ‘latest-commit-with-substitutes-available’ would use
> (git) and (guix ci) to find the latest commit for which substitutes of
> interest are available, and would return:
>
>   (channel
>     ;; …
>     (commit "cabbag3"))   ;the ideal commit
>
> This has to be done with great care to prevent a downgrade attack and to
> make sure the user doesn’t miss out on security updates, but maybe we
> could provide a procedure that makes reasonable choices.

This is a great idea.  Any kind of fetch policy could be implemented
with this, including one that considers the contents of a manifest.

This is another of these instances where having a general purpose
programming language underpinning it all really pays off.

--
Ricardo

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#26608 Provide --only-substitutes flag to "guix package --upgrade"