{ stdenv, kernel, busybox, cpio }:

stdenv.mkDerivation {
  name = "initramfs-yerba";
  src = ./.;
  buildInputs = [ cpio ];
  buildPhase = ''
    mkdir -p $out
    # Create initramfs directory structure
    mkdir -p initramfs/bin
    cp -a ${busybox}/bin/* initramfs/bin/
    cp ${./initramfs_init} initramfs/init
    chmod +x initramfs/init
    cd initramfs
    find . | cpio -o -H newc | gzip > $out/initramfs.cpio.gz
  '';
}