nixpkgs/nixos/modules/system/boot/loader/generic-extlinux-compatible/extlinux-conf-builder.nix

{ pkgs }:

pkgs.substituteAll {
  src = ./extlinux-conf-builder.sh;
  isExecutable = true;
  path = [pkgs.coreutils pkgs.gnused pkgs.gnugrep];
  inherit (pkgs) bash;
}