selfprivacy-nixos-config/hardware-configuration.nix

{ modulesPath, ... }:
{
  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
  boot.loader.grub.device = "/dev/sda";
  fileSystems = {
    "/" = { device = "/dev/sda1"; fsType = "ext4"; };
    "/var" = { device = "/dev/sdb"; fsType = "ext4"; };
  };
}