From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#19756: connection issues lead to cryptic backtrace
Date: Sat, 07 Feb 2015 23:18:59 +0100
Message-ID: <87a90p2wmk.fsf@inria.fr>
References: <20150203190012.GA28767@venom>
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To: sleep_walker@suse.cz
Cc: 19756-done@debbugs.gnu.org

sleep_walker@suse.cz skribis:

> I tried to use guix when I had connection issues and I wasn't aware of
> that, I got really wild traceback. It took me a while until I realized
> that connection problems may be the issue.
>
> Please, make the error message for connection problems readable for
> humans.

[...]

> In guix/scripts/substitute-binary.scm:
> 766: 5 [#<procedure 1f00060 at guix/scripts/substitute-binary.scm:677:3 (=
)>]
> In guix/serialization.scm:
> 329: 4 [restore "/gnu/store/r8zya664v53f560qbw8caxbwla2dv2zk-libxcb-1.11"]
> 329: 3 [restore "/gnu/store/r8zya664v53f560qbw8caxbwla2dv2zk-libxcb-1.11/=
lib"]
> 299: 2 [restore "/gnu/store/r8zya664v53f560qbw8caxbwla2dv2zk-libxcb-1.11/=
lib/libxcb-xfixes.a"]
>  94: 1 [read-string #<input: #{read pipe}# 12>]
>  66: 0 [read-int #<input: #{read pipe}# 12>]
>
> guix/serialization.scm:66:4: In procedure read-int:
> guix/serialization.scm:66:4: In procedure bv-u32-ref: Wrong type argument=
 in position 1 (expecting bytevector): #<eof>

This is terrible.

This happens when the connection to hydra.gnu.org is lost in the middle
of a transfer, which should normally be rare...

Commit 46b8aad fixes that.

Thanks,
Ludo=E2=80=99.