{
  inputs = {
    hops.url = "git+ssh://git@gitlab.hrz.tu-chemnitz.de/s4498638--tu-dresden.de/hops.git?ref=main";
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "nixpkgs/nixos-unstable";
  };

  outputs = { self, nixpkgs, hops, flake-utils }:
    (flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
        };
        config = ./stg.py;
        runScript = pkgs.writeShellScriptBin "run"
        ''
        ${hops.defaultPackage.${system}}/bin/sp.py -s ${config}
        ${hops.defaultPackage.${system}}/bin/hi.py -s ${config} client
        '';
      in {
      defaultApp = runScript;
      defaultPackage =
        pkgs.dockerTools.buildImage {
          name = "hello-docker";
          config = {
            Cmd = [ "${runScript}/bin/run" ];
          };
        };
      }
    ));
}