bug#71133: linux-libre-guix.tar.xz CI times out on aarch64-linux

[Christopher Baines]

Richard Sent <richard@freakingpenguin.com> writes:

> On aarch64 platforms, the linux-libre-guix.tar.xz.drv build times out
> [1].
>
> This package is known to have a long build time [2].
>
> Users can work around this by running the build locally with a (very,
> very large) max-silent-time (~28800 seconds on my machine). Given the
> impact of this issue (unable to build linux-libre on 64-bit Arm without
> running a multi-hour build), I think it's worth revisiting if the
> substitute server timeout should be increased again.
>
> Alternatively, perhaps we could fetch the officially released
> Linux-libre tarballs instead of computing them ourselves [3].
>
> [1]: https://ci.guix.gnu.org/build/4711550/log/raw
> [2]: https://mail.gnu.org/archive/html/guix-devel/2021-08/msg00077.html
> [3]: http://linux-libre.fsfla.org/pub/linux-libre/releases/
>
> CC'ing Christopher Baines since this deals with substitutes.

This derivation seems to have been built fine by the bordeaux build
farm:

  
https://data.guix.gnu.org/gnu/store/ny56fdcig9cd9bd3pssmlraz2c1q10q8-linux-libre-6.8.10-guix.tar.xz.drv

This is the timeout configuration for the bordeaux ARM build machines:

  (max-silent-time (* 12 3600))
  (timeout (* 72 3600))

e.g. 
https://git.savannah.gnu.org/cgit/guix/maintenance.git/tree/hydra/hatysa.scm#n262

The ci.guix.gnu.org Honeycomb timeouts are different, but don't look too
short. Maybe this build happened on an Overdrive system though.

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