test = with pkgs; let
        inherit (pkgs) writeShellScriptBin;
        inherit (pkgs.stdenv) mkDerivation;

        some-shell = writeShellScriptBin "some-shell.sh" ''
          echo some stuff
          exit
        '';
      in {
        description = "Test User";
        shell = mkDerivation {
          name = "some-shell.sh";
          buildInputs = [ some-shell ];
          builder = ((writeShellScriptBin "shell-builder.sh" ''
            PATH=${lib.makeBinPath [ coreutils ]}
            mkdir $out
            cp $src $out
          '') + "/bin/shell-builder.sh");
          src = "${some-shell}/bin/some-shell.sh";
          passthru = {
            shellPath = "/bin/some-shell.sh";
          };
        };
      };