GNU bug report logs - #27990
Offloading repeatedly prints a message of the form "process ... acquired build slot '/var/guix/offload/.../0"

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

From: Christopher Baines <mail <at> cbaines.net>
To: bug-guix <at> gnu.org
Subject: Offloading repeatedly prints a message of the form "process ...
 acquired build slot '/var/guix/offload/.../0"
Date: Sun, 6 Aug 2017 20:07:03 +0100

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

Hey,

I gave setting up offloading another go, I'm testing with 3 machines,
two running GuixSD, and one Debian. I've tried setting up offloading
from both GuixSD machines to the Debian machine, and from one GuixSD
machine to the other.

Running `guix offload test` works, and reports success. However, when
it actually comes to building something, guix repeatedly prints a
message like:

  "process ... acquired build slot '/var/guix/offload/.../0"

I've left it for a while, and nothing happened.

My usual approach at sticking more logging in to the code doesn't
really work, as it appears that it's not the offload script from the
Guix git repository that I have locally that is being used.

I'm happy to do some more investigation, but I haven't worked out how
to yet.

[Message part 2 (application/pgp-signature, inline)]

Message #10 received at 27990-done <at> debbugs.gnu.org (full text, mbox):

From: Christopher Baines <mail <at> cbaines.net>
To: 27990-done <at> debbugs.gnu.org
Subject: Offloading is now working!
Date: Thu, 31 Aug 2017 18:32:57 +0100

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

I tried again, and after one small change, things are now working!

Firstly, I was getting messages like:

process 1011 acquired build slot '/var/guix/offload/capella.local/0'
;;; [2017/08/31 18:16:40.455763, 0] private-key-from-file: [GSSH ERROR]
The file does not exist or permission denied: "/root/.ssh/id_rsa"


This was coming up over and over again, maybe I was hitting the same
problem, but this GSSH ERROR is something that I haven't seen before.

I had a look at the Guix source, and noticed that the private key to
use is a function of the current user. But as this is the offloader
script, I'm pretty sure that relates to the user of the guix-daemon,
which in my case is root. In my case, I want to offload as my user, so
I set private-key explicitly in /etc/guix/machines.scm, and now it just
works!

[Message part 2 (application/pgp-signature, inline)]

Message #13 received at 27990 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: 27990 <at> debbugs.gnu.org
Cc: mail <at> cbaines.net
Subject: Re: bug#27990: Offloading is now working!
Date: Sat, 02 Sep 2017 01:01:54 +0200

Christopher Baines <mail <at> cbaines.net> skribis:

> I had a look at the Guix source, and noticed that the private key to
> use is a function of the current user. But as this is the offloader
> script, I'm pretty sure that relates to the user of the guix-daemon,
> which in my case is root. In my case, I want to offload as my user, so
> I set private-key explicitly in /etc/guix/machines.scm, and now it just
> works!

Good news!  This private-key thing is a common gotcha.

Ludo’.

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