{
  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;
      in {
      defaultPackage =
        pkgs.dockerTools.buildImage {
          name = "hello-docker";
          config = {
            Cmd = [ "${pkgs.bash}/bin/bash" "-c"
                    ''"${hops.defaultPackage.${system}}/bin/sp.py -s ${config} && \
                      ${hops.defaultPackage.${system}}/bin/hi.py -s "${config} client"''
                  ];
          };
        };
      }
    ));
}