default.nix

{pkgs ? (import <nixpkgs> {})}:

pkgs.stdenv.mkDerivation {
  name = "fetchtarballtest";
  
  src = pkgs.fetchurl {
    url = https://github.com/NixOS/nixpkgs/archive/9c90ff7e7df9ceadc7335bb43cc67ba92e171d53.tar.gz;
    sha256 = "0f8ynrrj24i4g8flp978ccsb2hlwk1n321z8xwj0wakj0ak4c8i9";
  };

  installPhase = ''
    mkdir -p out
  '';
}