On Fri, Sep 10 2021, Ludovic Courtès wrote:

> Hi,
>
> Xinglu Chen <public@yoctocell.xyz> skribis:
>
>> Otherwise, remotes without a branch named 'master' will cause an error when
>> importing.
>>
>> * guix/import/elpa (git-repository->origin): Fallback to HEAD instead of the
>>   'master' branch.
>
> Applied, thanks!
>
>> For example, try to import the ‘consult’ package from MELPA:
>>
>> $ ./pre-inst-env guix import elpa -a melpa consult
>
> This example works for me:
>
> --8<---------------cut here---------------start------------->8---
> $ guix describe
> Generacio 189   Aug 30 2021 12:09:27    (nuna)
>   guix f91ae94
>     repository URL: https://git.savannah.gnu.org/git/guix.git
>     branch: master
>     commit: f91ae9425bb385b60396a544afe27933896b8fa3
> ludo@ribbon ~/src/guix$ guix import elpa -a melpa consult
>
> Starting download of /tmp/guix-file.E3Bp9a
> From https://melpa.org/packages/consult-20210905.1657.tar...
>  …0905.1657.tar  240KiB               501KiB/s 00:00 [##################] 100.0%
> (package
>   (name "emacs-consult")
>   (version "20210905.1657")
>   (source
>     (origin
>       (method url-fetch)
>       (uri (string-append
>              "https://melpa.org/packages/consult-"
>              version
>              ".tar"))
>       (sha256
>         (base32
>           "0d29fd0r6bsn3ivqzjdlj7yhafbs84x3p4v7885nc14fgmbl5a7k"))))
> […]
> --8<---------------cut here---------------end--------------->8---
>
> But maybe something changed on MELPA in the meantime?

Ah, I think you are running into #49006[1], which uses the MELPA URL
instead of the Git repo.

[1]: <https://issues.guix.gnu.org/49006>