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

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

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From: Konrad Hinsen <konrad.hinsen@fastmail.net>
To: Ludovic Courtès <ludo@gnu.org>, Alex Sassmannshausen
 <alex@pompo.co>
Subject: Re: bug#22629: “Stable” branch
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Date: Fri, 31 Aug 2018 11:39:55 +0200
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Hi Ludo,

> 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:

I really like that idea, but it's a pity to limit it to channels.
Two scenarii I'd like to see covered are:

 1) Find the latest commit with all substitutes required by a given
    manifest.

 2) Find the latest commit with all substitutes required for updating a
    given profile.

This is in fact only one problem with two user interfaces.

Konrad.

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