Disarchive and SHA

[zimoun]

Hi,

Trying to investigate why, for instance,

--8<---------------cut here---------------start------------->8---
$ guix lint -c archival zabbix-agentd
gnu/packages/monitoring.scm:167:5: zabbix-agentd@5.2.6: Disarchive entry refers 
to non-existent SWH directory 'e664cd5e820df2a194a5c6a64f12161480331b4b'
--8<---------------cut here---------------end--------------->8---

I notice something annoying.  For representing SHA-256, Guix uses
’nix-base32’ and Disarchive uses ’base16’.

Therefore, from the source,

--8<---------------cut here---------------start------------->8---
(define-public zabbix-agentd
  (package
    (name "zabbix-agentd")
    (version "5.2.6")
    (source
     (origin
       (method url-fetch)
       (uri (string-append
             "https://cdn.zabbix.com/zabbix/sources/stable/";
             (version-major+minor version) "/zabbix-" version ".tar.gz"))
       (sha256
        (base32 "100n1rv7r4pqagxxifzpcza5bhrr2fklzx7gndxwiyq4597p1jvn"))))
--8<---------------cut here---------------end--------------->8---

it does not match the URL:

<http://disarchive.guix.gnu.org/sha256/100n1rv7r4pqagxxifzpcza5bhrr2fklzx7gndxwiyq4597p1jvn>

and instead, one has to convert to ’base16’.  I am not aware of any tool
to ease this transformation.  Maybe, we could add an option to “guix
hash”.  WDYT?


Using ’base16’, the URL matches and the file is downloaded.  Neat!

<http://disarchive.guix.gnu.org/sha256/76cb704f2a04fbc87bb3eff44fa71339c355d467f7bbd8fb53f8927c760e1680>



Along the process, I also notice,

--8<---------------cut here---------------start------------->8---
$ guix download 
https://cdn.zabbix.com/zabbix/sources/stable/5.2/zabbix-5.2.6.tar.gz

Starting download of /tmp/guix-file.rcYxyF
>From https://cdn.zabbix.com/zabbix/sources/stable/5.2/zabbix-5.2.6.tar.gz...
download failed 
"https://cdn.zabbix.com/zabbix/sources/stable/5.2/zabbix-5.2.6.tar.gz"; 404 "Not 
Found"

Starting download of /tmp/guix-file.rcYxyF
>From 
>https://web.archive.org/web/20211020115955/https://cdn.zabbix.com/zabbix/sources/stable/5.2/zabbix-5.2.6.tar.gz...
following redirection to 
`https://web.archive.org/web/20210410075108/https://cdn.zabbix.com/zabbix/sources/stable/5.2/zabbix-5.2.6.tar.gz'...
 …2.6.tar.gz                                                        350KiB/s 
00:57 | 19.6MiB transferred
/gnu/store/3w8mp25gyrkq3dngaw27kvqaggrx9qp0-zabbix-5.2.6.tar.gz
100n1rv7r4pqagxxifzpcza5bhrr2fklzx7gndxwiyq4597p1jvn
--8<---------------cut here---------------end--------------->8---

And this fallback is not done by the file ’sources.json’.

--8<---------------cut here---------------start------------->8---
$ wget https://guix.gnu.org/sources.json
$ cat sources.json | jq | grep zabbix
      "git_url": "https://github.com/lukecyca/pyzabbix";,
        "https://cdn.zabbix.com/zabbix/sources/stable/5.2/zabbix-5.2.6.tar.gz";
      "git_url": "https://github.com/unioslo/zabbix-cli";,
        "https://cdn.zabbix.com/zabbix/sources/stable/5.2/zabbix-5.2.6.tar.gz";
--8<---------------cut here---------------end--------------->8---

That’s why «Disarchive entry refers to non-existent SWH directory».


Help welcome for improving this ’sources.json’. :-)  Especially, turning
the current way using the website builder into derivation-style usable
by the CI.


Cheers,
simon