bug#44256: “guix import cran -a bioconductor FOO” downloads twice

[zimoun]

Hi,

On Tue, 27 Oct 2020 at 14:55, zimoun <zimon.toutoune@gmail.com> wrote:

> $ guix import cran -a bioconductor CATALYST
>
> Starting download of /tmp/guix-file.OPtOW1
>>From 
>>https://bioconductor.org/packages/release/bioc/src/contrib/CATALYST_1.12.2.tar.gz...
>  …12.2.tar.gz  10.2MiB                567KiB/s 00:18 [##################] 
> 100.0%
>
> Starting download of /tmp/guix-file.V6sC1Z
>>From 
>>https://bioconductor.org/packages/release/bioc/src/contrib/CATALYST_1.12.2.tar.gz...
>  …12.2.tar.gz  10.2MiB                565KiB/s 00:19 [##################] 
> 100.0%
>
> I have not investigated more, if the issue is from the importer or from
> the information provided by Bioconductor.

It comes from ’cran->guix-package’ in (guix import cran):

--8<---------------cut here---------------start------------->8---
     (let ((description (fetch-description repo package-name)))
       (if description
           (description->package repo description)
--8<---------------cut here---------------end--------------->8---

where ’fetch-description’ effectively downloads but then
’description->package’ downloads again:

--8<---------------cut here---------------start------------->8---
         (source     (download source-url #:method (cond
                                                    (git? 'git)
                                                    (hg? 'hg)
                                                    (else #f))))
--8<---------------cut here---------------end--------------->8---

This second download is not necessary.  The fix needs some care with the
different repositories.


Cheers,
simon