{
  stdenv,
  gnutar,
  src,
}:
stdenv.mkDerivation {
  pname = "untar";
  version = "1.0";

  inherit src;

  buildInputs = [ gnutar ];

  # input is a file, not a directory, skip unpackPhase
  unpackPhase = "true";

  installPhase = ''
    mkdir -p $out
    tar xf ${src} -C $out/
  '';
}