--fallback doesn't do anything when 'connect*' fails

tags: + substituter

Hi,

Version:

$ /run/current-system/profile/bin/guix-daemon --version

guix-daemon (GNU Guix) 1.3.0-2.9f2b2c4

$ guix --version

guix (GNU Guix) e3d67b71cb0ccd5ad5563ebaffe6adc6c96c0c7c

Command:

$ guix system -L . reconfigure [...].scm --fallback

[...]

substitute: lijst van substitutes van ‘[...].local:8080’ aan het bijwerken... 100.0%

substitute: lijst van substitutes van ‘https://ci.guix.gnu.org’ aan het bijwerken... 0.0%guix substitute: warning: ci.guix.gnu.org: connection failed: Verbinding is verlopen

substitute:

substitute: lijst van substitutes van ‘[...].gr’ aan het bijwerken... 0.0%guix substitute: warning: guix.tobias.gr: connection failed: Netwerk is onbereikbaar

substitute:

16,4 MB zal binnengehaald worden

substitute: lijst van substitutes van ‘[...]:8080’ aan het bijwerken... 0.0%

[8 repetitions of the line above]

guix substitute: warning: [...].local: host not found: Naam of dienst is niet bekend

guix substitute: warning: tijdens het binnenhalen van https://ci.guix.gnu.org/nar/lzip/r8a9kzhhx89rmmkz66i3324acgliqdwa-gdm-3.34.1:de server is een beetje traag

guix substitute: warning: probeer ‘--no-substitutes’ als het probleem hardnekkig is

guix substitute: error: connect*: Verbinding is verlopen

vervanging van /gnu/store/r8a9kzhhx89rmmkz66i3324acgliqdwa-gdm-3.34.1 mislukt

guix system: error: beschadigde invoer tijdens het terugplaatsen van het archief uit #<closed: file 7f0d323528c0>

What I would expect:

As I specified the --fallback option, I would expect guix to start

building from source, as the substitution failed.

Hello Maxime,

There are actually two bugs withing a single one here. The first one is

that you could not connect to the berlin publish server in less than 5

seconds (the timeout duration).

I have already observed such problems on the build farm and reported it

here: https://issues.guix.gnu.org/48468.It has been mitigated by

implementing keep-alive support[1]. However, I suppose that the

underlying issue is that guix-publish is in some cases over-flood and

fails to accept new connections.

The second issue is that as you noticed, the fallback option doesn't

have any effect.

Thanks,

Mathieu

[1]: https://issues.guix.gnu.org/48556

Mathieu Othacehe schreef op vr 18-06-2021 om 17:36 [+0200]:

FWIW, the network connection was very flaky then.

Taking more than 5 seconds to connect seems plausible here.

Greetings,

Maxime.