Attempting to build fedora coreos for RPI on x86_64

[dwarf-king-hreidmar]

Background: I run a k0s cluster on four RPi4. I want to switch over to fedora CoreOS for these devices. I’m using an isolated switch for cluster communications and I use wifi on each device for network egress/ingress. This means there is only wifi connectivity to the outside world. I'm trying to build a fedora coreos image for my Pi's that contain the necessary wifi packages such as NetworkManager-wifi.

I'm using my laptop (x86_64) to try and build a suitable image using coreos-assembler but I'm pretty new to it. I've got a working directory. I can run cosa init /fetch just fine. How can I build a version of the image that doesn't match the arch of my build machine?

Any other tips and tricks on getting the wifi packages I need built into my own image would also be super helpful.

Thanks so much for this awesome tool.
P.S happy to write docs up for how to do this once I have it working / tested

[cgwalters]

See https://docs.fedoraproject.org/en-US/fedora-coreos/os-extensions/
and coreos/layering-examples#14

[cgwalters]

To be clear, coreos-assembler is not currently intended to be used outside of developing the FCOS "base image" today. See also https://coreos.github.io/coreos-assembler/custom/

How can I build a version of the image that doesn't match the arch of my build machine?

That'd currently require some plumbing in the system; we may eventually support it. However note that with the coreos layering approach, you can use e.g. podman's builtin podman build --arch that uses qemu.