# Pastebin zosiMzah
  compiledSprockets = stdenv.mkDerivation rec {
    name = "sprockets";

    ignore = map (path: toString path ) [
      ../bin
      ../.bundle
      ../db
      ../.env
      ../frontend
      ../.git
      ../log
      ../nix
      ../node_modules
      ../public/assets
      ../result
      ../scripts
      ../secrets
      ../.shell.drv
      ../tmp
      ../vendor/bundle
      ../webpack-assets.json
      ../webpack-assets-deploy.json
    ];

    src = filterSource (path: type:
      (all (i: i != path) ignore)
    ) ../.;

    buildInputs = [ gems nodejs ];

    installPhase = ''
      shopt -s dotglob

      mkdir -p $out/build-assets
      cd $out/build-assets

      cp -r $src/* .

      find -type f -exec chmod 0644 {} +
      find -type d -exec chmod 0744 {} +

      ${concatStringsSep "\n" (map (e: "export ${escapeShellArg e}") fullEnv)}

      rake assets:precompile

      mkdir -p $out/foobar/public
      cd $out
      cp -r $out/build-assets/public/assets/ $out/foobar/public/assets
      rm -rf $out/build-assets
    '';
  };