GNU bug report logs - #64057
qemu-guest-agent-shepherd-service probably lacks (requirement '(udev))

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Yann Dupont <yann.dupont <at> univ-nantes.fr>
To: bug-guix <at> gnu.org
Subject: qemu-guest-agent-shepherd-service probably lacks (requirement '(udev))
Date: Tue, 13 Jun 2023 16:55:52 +0200

[Message part 1 (text/plain, inline)]

Hi all, we've noticed that qemu-guest-agent doesn't start reliably on 
virtual machines generated by guix system.
the log file shows the following:

2023-06-12 14:36:14 1686573373.873765: critical: error opening channel 
'/dev/virtio-ports/org.qemu.guest_agent.0': No such file or directory 
2023-06-12 14:36:14 1686573373.873779: critical: failed to create guest 
agent channel 2023-06-12 14:36:14 1686573373.873782: critical: failed to 
initialize guest agent channel

I guess the udev dependency is missing. The following patch seems to do 
the trick here:

diff --git a/gnu/services/virtualization.scm 
b/gnu/services/virtualization.scm index 2e311e3813..b1b7eafd75 100644 
--- a/gnu/services/virtualization.scm +++ 
b/gnu/services/virtualization.scm @@ -962,6 +962,7 @@ (define 
(qemu-guest-agent-shepherd-service config) (list (shepherd-service 
(provision '(qemu-guest-agent)) + (requirement '(udev)) (documentation 
"Run the QEMU guest agent.") (start #~(make-forkexec-constructor 
`(,(string-append #$qemu "/bin/qemu-ga")

Cheers,

[Message part 2 (text/html, inline)]

Message #10 received at 64057-done <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Yann Dupont <yann.dupont <at> univ-nantes.fr>
Cc: 64057-done <at> debbugs.gnu.org
Subject: Re: bug#64057: qemu-guest-agent-shepherd-service probably lacks
 (requirement '(udev))
Date: Fri, 16 Jun 2023 00:20:37 +0200

Hi,

Yann Dupont <yann.dupont <at> univ-nantes.fr> skribis:

> Hi all, we've noticed that qemu-guest-agent doesn't start reliably on virtual machines generated by guix system. 
> the log file shows the following:
>
> 2023-06-12 14:36:14 1686573373.873765: critical: error opening channel '/dev/virtio-ports/org.qemu.guest_agent.0': No such file or directory 2023-06-12
> 14:36:14 1686573373.873779: critical: failed to create guest agent channel 2023-06-12 14:36:14 1686573373.873782: critical: failed to initialize guest agent
> channel
>
> I guess the udev dependency is missing. The following patch seems to do the trick here: 

Thanks for the bug report and suggestion!  This is now fixed in
c27479a739cdbe89be7cb03f73a4a5230e84379d.

LUdo’.

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