bug#26489: [PATCH] substitute: Ignore bad responses.

[ludo@gnu.org (Ludovic Courtès)]

Howdy!

Tobias Geerinckx-Rice <me@tobias.gr> skribis:

> * guix/scripts/substitute.scm (http-multiple-get): Catch BAD-RESPONSE
> exceptions and keep going.
> ---
>
> Guix,
>
> One weird HTTP response from a server will kill ‘guix substitute’:
>
>   updating list of substitutes from 'https://foo'...  50.0%Backtrace:
>   ...
>   guix/ui.scm:1229:8: In procedure run-guix-command:
>   guix/ui.scm:1229:8: Throw to key `bad-response' with args
>                       `("Bad Response-Line: ~s" (""))'.
>   error: build failed: substituter `substitute' died unexpectedly
>
> Attached is a patch to ignore such bad responses. The offending .narinfo
> will be ignored for that session, and not cached at all. The result:

I’m sure you expect this question: what bad responses did you get in
practice?  :-)

Usually that is a sign of a broken HTTP server.  Of course it’s
widespread enough, we’d better handle it, either in Guix or directly in
(web client) in Guile; OTOH, if it’s a genuine problem, we’d better not
hide it.

Thanks,
Ludo’.