{device ? throw "Must define a device, e.g. /dev/sda"}:
{
  disko.devices = {
    disk.main = {
        inherit device;
        type = "disk";
        content = {
          type = "gpt";
          partitions = {
            ESP = {
              priority = 1;
              name = "ESP";
              start = "1M";
              end = "512M";
              type = "EF00";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
              };
            };
            root = {
              name = "root";
              size = "100%";
              content = {
                type = "lvm_pv";
                vg = "root_vg";
              };
            };
        };
      };
    };
    lvm_vg = {
      root_vg = {
        type = "lvm_vg";
        lvs = {
          root = {
            size = "100%FREE";
            content = (import ./btrfs-persist.nix);
            };
        };
      };
    };
  };
}