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[bug#42048] [PATCH 6/6] services: provenance: Save channel introductions

From: Ricardo Wurmus
Subject: [bug#42048] [PATCH 6/6] services: provenance: Save channel introductions.
Date: Wed, 01 Jul 2020 14:25:04 +0200
User-agent: mu4e 1.4.10; emacs 26.3

Ludovic Courtès <> writes:

> So yes, I suppose we would need to extend the ‘.guix-channel’ format for
> dependencies.  Luckily it should be quite simply because that format is
> extensible; older Guix versions would ignore the ‘introduction’ field.
> It would look something like this:
>      (channel
>       (version 0)
>       (dependencies
>        (channel
>         (name some-collection)
>         (url "";)
>         (introduction (channel-introduction
>                         (version 0)
>                         (commit "…")
>                         (signer "…"))))
>        (channel
>         (name some-other-collection)
>         (url "";)
>         (branch "testing"))))   ;not an authenticated channel
> It does mean that a channel can indirectly trick you into turning off
> authentication for a dependent channel.  But I think that’s within the
> expectations for channels: when you choose a channel, you trust it
> enough to run its code.

This sounds reasonable.  I agree that you’ve got to trust the channel
authors anyway, so allowing them to provide the introduction is fair.


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