#56005 - "write_wait_fd: unimplemented" error from 'guix substitute'

Package	Source(s)		Maintainer(s)
guix		PTS Buildd Popcon

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From: Ludovic Courtès <ludo@gnu.org>
To: Thiago Jung Bauermann <bauermann@kolabnow.com>
Subject: Re: [bug#56867] [PATCH] download: Do not wrap TLS port on GnuTLS >=
 3.7.7.
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Hi,

Thiago Jung Bauermann <bauermann@kolabnow.com> skribis:

> Ludovic Courtès <ludo@gnu.org> writes:
>
>> First, I noticed that GnuTLS doesn’t implement ‘write_wait_fd’, only
>> ‘read_wait_fd’ (not sure how problematic that is):
>>
>> scheme@(guile-user)> ,use(web client)
>> scheme@(guile-user)> (define p (open-socket-for-uri "https://guix.gnu.org"))
>> scheme@(guile-user)> ((@@ (ice-9 suspendable-ports) wait-for-writable) p)
>> ice-9/boot-9.scm:1685:16: In procedure raise-exception:
>> In procedure write_wait_fd: unimplemented
>>
>> Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
>> scheme@(guile-user) [1]> ,q
>> scheme@(guile-user)> ,use(gnutls)
>> scheme@(guile-user)> (gnutls-version)
>> $1 = "3.7.7"
>> scheme@(guile-user)> ((@@ (ice-9 suspendable-ports) wait-for-readable) p)
>> $2 = 1
>
> This occasionally causes problems when fetching substitutes, as can be
> seen in bug #56005 (during substitution: write_wait_fd: unimplemented).

Oh, I have not seen it but it’s weird: (guix scripts substitute) doesn’t
use O_NONBLOCK sockets, so I don’t get how it can hit that.  Needs
investigation…

Thanks,
Ludo’.

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#56005 "write_wait_fd: unimplemented" error from 'guix substitute'