{
  config,
  lib,
  ...
}: let
  mountDir = "/mnt/sync";
  configDir = "/etc/syncthing";
in {
  options = {
    services.syncthing.impermanence.enable = lib.mkOption {
      type = lib.types.bool;
      default = config.services.syncthing.enable && config.storage.impermanence.enable;
    };
  };

  config = lib.mkIf config.services.syncthing.enable {
    storage.datasets.replicate."system/root" = {
      directories = {
        "${mountDir}" = lib.mkIf config.services.syncthing.impermanence.enable {
          enable = true;
          owner.name = "syncthing";
          group.name = "syncthing";
        };
        "${configDir}" = lib.mkIf config.services.syncthing.impermanence.enable {
          enable = true;
          owner.name = "syncthing";
          group.name = "syncthing";
        };
      };
    };
  };
}