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foreign guix offload checklist?

From: Jesse Gibbons
Subject: foreign guix offload checklist?
Date: Sun, 13 Dec 2020 21:39:48 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Icedove/78.5.1

Hi guix,
I'm trying to offload a build onto a machine with a foreign distro. I'm getting the following error:

$ guix build --system=armhf-linux --no-substitutes hello
The following derivations will be built:
process 22691 acquired build slot '/var/guix/offload/'
normalized load on machine '' is 0.02
building /gnu/store/w9lgwyp9a9v12x0bja3brhqj5ilb6l93-hello-2.10.tar.gz.drv...
waiting for locks or build slots...
guix offload: error: failed to connect to `#<input-output: channel (open) 7f5b4a378460>': Protocol error cannot build derivation `/gnu/store/jidb0saw2s3zd1gvnziw064hbb1hxz7y-hello-2.10.drv': 1 dependencies couldn't be built guix build: error: build of `/gnu/store/jidb0saw2s3zd1gvnziw064hbb1hxz7y-hello-2.10.drv' failed

Is there a checklist for what must be done to set up a machine with a foreign distro as a build machine ("build slave")? Here's what I have so far:

- [X] Make sure guile-ssh is installed on master. This should already be done if master runs guix distro. - [X] Configure slave to accept master's ssh key '~/.ssh/`. If user wants to use configurations as close to default as possible, also configure it to accept '/root/.ssh/'.
- [X] install guix on master
- [X] Exchange guix public keys between master and slave. If master runs guix distro, the slave key should be added to the config.
- [X] Add slave to /etc/guix/machines.scm as described in the manual.

Am I missing any step?

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