{device ? throw "Must define a devices, e.g. /dev/sda"}:
{
  disko.devices = {
    disk = {
      vdb = {
        type = "disk";
        inherit device;
        content = {
          type = "gpt";
          partitions = {
            ESP = {
              size = "512M";
              type = "EF00";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = [
                  "defaults"
                ];
              };
            };
            luks = {
              size = "100%";
              content = {
                type = "luks";
                name = "crypted";
                passwordFile = "/tmp/luks_secret.key"; # Interactive
                content = (import ./btrfs-persist.nix);
                };
              };
          };
        };
      };
    };
  };
}