[bug#54723] [PATCH] Check URI when verifying narinfo validity.

[Guillaume Le Vaillant]

Ludovic Courtès <ludo@gnu.org> skribis:

> Hi,
>
> [...]
>
> Could you grab a narinfo and share it?
>
>   wget -qO - http://192.168.0.22:8080/HASH.narinfo
>
> where HASH is the hash part of a store item.
>
> What could happen though is a situation where ‘guix publish’ only offers
> a compression method not supported by the client.  In that case,
> ‘narinfo-best-uri’ throws a match-error because ‘choices’ is the empty
> list.  We should fix that.

I tried downloading a few narinfos and they don't look broken (2 of them
in attachment).

However for one of them it looks like the guix-publish server got stuck
on the request for several minutes (the second attempt worked):

--8<---------------cut here---------------start------------->8---
wget http://192.168.0.22:8080/184b50qkcrkchc6dpwwcd7ypqb5yvrm3.narinfo
--2022-04-05 19:33:56--  
http://192.168.0.22:8080/184b50qkcrkchc6dpwwcd7ypqb5yvrm3.narinfo
Connexion à 192.168.0.22:8080… connecté.
requête HTTP transmise, en attente de la réponse… Erreur de lecture (Connexion 
ré-initialisée par le correspondant) dans les en-têtes.
Nouvel essai.

--2022-04-05 19:36:40--  (essai :  2)  
http://192.168.0.22:8080/184b50qkcrkchc6dpwwcd7ypqb5yvrm3.narinfo
Connexion à 192.168.0.22:8080… connecté.
requête HTTP transmise, en attente de la réponse… 200 OK
Taille : 7428 (7,3K) [application/x-nix-narinfo]
Sauvegarde en : « 184b50qkcrkchc6dpwwcd7ypqb5yvrm3.narinfo »

184b50qkcrkchc6dpwwcd7ypqb5yvrm3.narinfo        
100%[=====================================================================================================>]
   7,25K  --.-KB/s    ds 0,02s   

2022-04-05 19:36:40 (391 KB/s) — « 184b50qkcrkchc6dpwwcd7ypqb5yvrm3.narinfo » 
sauvegardé [7428/7428]
--8<---------------cut here---------------end--------------->8---

Could that be the cause of the issue?

ly615k3xjapk0wq7y2n4ld6msi7307ba.narinfo
Description: Binary data

184b50qkcrkchc6dpwwcd7ypqb5yvrm3.narinfo
Description: Binary data