bug#65740: No fallback to SWH for .guix-channel dependencies

[Ludovic Courtès]

Hi,

Simon Tournier <zimon.toutoune@gmail.com> skribis:

> The main reason is because the channel bimsb contains the file
> .guix-channel which reads,
>
> (channel
>  (version 0)
>  (dependencies
>   (channel
>    (name guix-past)
>    (url "https://gitlab.inria.fr/guix-hpc/guix-past";))
>   (channel
>    (name guix-science)
>    (url "https://github.com/guix-science/guix-science.git";))))
>
> And Guix is not able to fallback to SWH for these channels.

Yes, but that’s expected: we’re not specifying any commit, only the URL,
so there cannot be any sort of fallback.

> Corollary, even if it was able, what is the correct revision of
> the guix-past or guix-science channels?
>
> This report is about two bugs:
>
>  1. transparent fallback to SWH for .guix-channel dependencies
>
>  2. pin all channels when running “guix describe”, even the ones from
>    .guix-channel dependencies.

#1 happens, but only when channels are pinned (returned by ‘guix
#describe’).

Re #2, I don’t think there’s such a bug, is there?  In the example
below, ‘guix describe’ shows 4 channels (including dependencies), not 2:

--8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix time-machine -C <(echo '(cons (channel (name (quote 
bimsb)) (url "https://github.com/BIMSBbioinfo/guix-bimsb.git";)) 
%default-channels)') -- describe -f channels

[...]

(list (channel
        (name 'guix)
        (url "https://git.savannah.gnu.org/git/guix.git";)
        (branch "master")
        (commit
          "4dd33fc62899134606f36f92594cf160b972f685")
        (introduction
          (make-channel-introduction
            "9edb3f66fd807b096b48283debdcddccfea34bad"
            (openpgp-fingerprint
              "BBB0 2DDF 2CEA F6A8 0D1D  E643 A2A0 6DF2 A33A 54FA"))))
      (channel
        (name 'bimsb)
        (url "https://github.com/BIMSBbioinfo/guix-bimsb.git";)
        (branch "master")
        (commit
          "240a599f77dab7dcb8d2ed091b90056e58a46c51"))
      (channel
        (name 'guix-science)
        (url "https://github.com/guix-science/guix-science.git";)
        (branch "master")
        (commit
          "1ad5192cff0d7b34a2f74592c6896f901d1c9ccd"))
      (channel
        (name 'guix-past)
        (url "https://gitlab.inria.fr/guix-hpc/guix-past";)
        (branch "master")
        (commit
          "1e25b23faa6b1716deaf7e1782becb5da6855942")))
--8<---------------cut here---------------end--------------->8---

Thanks,
Ludo’.