I tried it (loop mounting qemu image): systemd-nspawn -D ./hd0 -b
and it failed miserably with "Timeout waiting for device dev-disk-by...". Which is not surprising as there are no device units inside of container (it stops in single user allowing me to use sysctl -t device). Is it supposed to work at all? Even if I bind mount /dev/disk it does not help as systemd does not care whether device is actually present or not.
