Re: Guix substitute timeout

["Ludovic Courtès" <ludo@gnu.org>]

Hi Chris!

Christopher Baines <mail@cbaines.net> skribis:

> I'm unsure how well the substituter copes with unreliable network
> connections, anecdotally it seems to often hang indefinitely.

How often?

I experienced it at some point last year but the problem vanished soon
after I reported it here: <https://issues.guix.gnu.org/issue/31925>.

If you can reproduce it, could you try to get a C backtrace of ‘guix
substitute’, as well as the output of ‘guix’ to see if it’s fetching
gzip or lzip stuff, and the process sub-tree?

> Looking at the code [1], there is some code that looks like it would
> cancel the substitution after some amount of time, but it also looks to
> be disabled (as #:timeout? is #f when fetch is called).

That comes from commit 2207f73156e144a9349e4d395d5049119b67a896 from
2013 (!), when hydra.gnu.org was so slow and (I think) we’d rather not
time out too quickly while fetching a substitute or we’d never fetch
anything.  Good times…

We could probably enable it, though it should be a not-too-short
timeout.

Thoughts?

Ludo’.