Operation not supported

[mohlek]

Im currently booting a diskless workstation via pxe.
the / filesystem is provided via nfs. Now I need to start a desktop environment and therefore I need to be able to write some files (.Xauthority and so on). I dont want this files to saved to the nfs (the nfs export is ro anyway). All my changes to the filesystem needs to be dropped after shutdown. Thats why this project seems to fit perfectly for me.

My current situation is that the hook seems to be working. My / is mounted on an overlayfs and files are getting read via nfs. When I try to write to a file its only possible on /

I'm using oroot=raw

$: touch /a works as intended
$: touch /home/abc/a Operation not supported

What am I missing?

Are there any logs I could paste for more information?