bug#58204: guix system reconfigure hangs silently when substitute server is unreachable

bug#58204: guix system reconfigure hangs silently when substitute server is unreachable

[Maxim Cournoyer]

Hi,

While fixing up Berlin today, I had to use '--no-substitutes' on the
daemon started per 'info (guix)Chrooting', otherwise it'd hang up
without printing any of the warnings (totally silent).  Using strace, I
could see:

--8<---------------cut here---------------start------------->8---
guix substitute: warning: ci.guix.gnu.org: host not found: System error
--8<---------------cut here---------------end--------------->8---

It'd be nice if these warnings were propagated all the way up so the
user would realize what is happening and take action.

-- 
Thanks,
Maxim

bug#58204: guix system reconfigure hangs silently when substitute server is unreachable

[Ludovic Courtès]

Hi,

Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:

> While fixing up Berlin today, I had to use '--no-substitutes' on the
> daemon started per 'info (guix)Chrooting', otherwise it'd hang up
> without printing any of the warnings (totally silent).  Using strace, I
> could see:
>
> guix substitute: warning: ci.guix.gnu.org: host not found: System error
>
> It'd be nice if these warnings were propagated all the way up so the
> user would realize what is happening and take action.

I think it’s supposed to be propagated.

In the example above, I guess there were cached ci.guix.gnu.org narinfos
for those substitutes and the “host not found” error arose when actually
trying to substitute these, right?

I’m surprised substitution didn’t just crash.

Thanks,
Ludo’.

bug#58204: guix system reconfigure hangs silently when substitute server is unreachable

[Maxim Cournoyer]

Hi,

Ludovic Courtès <ludo@gnu.org> writes:

> Hi,
>
> Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:
>
>> While fixing up Berlin today, I had to use '--no-substitutes' on the
>> daemon started per 'info (guix)Chrooting', otherwise it'd hang up
>> without printing any of the warnings (totally silent).  Using strace, I
>> could see:
>>
>> guix substitute: warning: ci.guix.gnu.org: host not found: System error
>>
>> It'd be nice if these warnings were propagated all the way up so the
>> user would realize what is happening and take action.
>
> I think it’s supposed to be propagated.

It wasn't :-/.

> In the example above, I guess there were cached ci.guix.gnu.org narinfos
> for those substitutes and the “host not found” error arose when actually
> trying to substitute these, right?

I guess so!  It's not an easily situation to reproduce, so perhaps the
best we can do is assume this was the case and validate the
corresponding code path.

Thanks,

-- 
Maxim