{ pkgs ? import <nixpkgs> {} }:

let utils = import ../deployment/utils.nix {} ;
    files = [
      (utils.copy ./cgiup.rb "home/joske/cgiup.rb")
      (utils.copy ./ruby_challenge.rb "home/joske/ruby_challenge.rb")
    ] ;
in 
  pkgs.dockerTools.buildImage {
    name = "ruby-challenge";
    tag = "latest"; 
    contents = files ++ [ pkgs.ruby pkgs.coreutils pkgs.busybox ];
    runAsRoot = ''
      ${pkgs.dockerTools.shadowSetup}
      useradd -U -m joske
      mkdir -p /home/joske
      mkdir /tmp
      chmod o+rw /tmp
      chmod +x /home/joske/ruby_challenge.rb
      chown -R joske:joske /home/joske
      chmod -R -w /home/joske
    '';
    config = {
      ExposedPorts = {
        "3000/tcp" = {};
      };
      WorkingDir = "/home/joske/";
      Cmd = [ "${pkgs.ruby}/bin/ruby" "cgiup.rb" "ruby_challenge.rb" ];
    };
  }