{
  config,
  lib,
  syncthingConfiguration,
  ...
}: let
  mountDir = "/mnt/sync";
  configDir = "/etc/syncthing";
in {
  config = lib.mkMerge [
    {
      systemd = lib.mkIf config.services.syncthing.enable {
        tmpfiles.rules = [
          "A ${mountDir} -    -        -               - u:syncthing:rwX,g:syncthing:rwX,o::-"
          "d ${mountDir} 2755 syncthing syncthing -"
          "d ${config.services.syncthing.dataDir} 775 syncthing syncthing -"
          "d ${config.services.syncthing.configDir} 755 syncthing syncthing -"
        ];
      };
    }
    (lib.mkIf config.services.syncthing.enable (lib.mkMerge [
      {
        services.syncthing = {
          user = "syncthing";
          group = "syncthing";
          dataDir = "${mountDir}/default";
          configDir = configDir;
          overrideDevices = true;
          overrideFolders = true;
          configuration = syncthingConfiguration;
          deviceName = config.networking.hostName;
        };
      }
    ]))
  ];
}