{ lib, ... }:
{
  # Let the image format own the root FS mapping
  fileSystems."/" = lib.mkForce {
    device = "/dev/disk/by-label/nixos";
    fsType = "ext4";
  };

  # Make the image self-booting under libvirt
  # virtualisation.useBootLoader = true;
  # boot.loader.grub.device = "/dev/vda";

  # Optional: auto-grow root at first boot
  boot.growPartition = true;
}