{fetchzip}:
fetchzip {
  url = https://github.com/NixOS/nixos-artwork/releases/download/bootloader-18.09-pre/grub2-installer.tar.bz2;
  sha256 = "0rhh061m1hpgadm7587inw3fxfacnd53xjc53w3vzghlck56djq5";
}