nixpkgs/pkgs/misc/bleeding-edge-fetch-info/git.nix

 args: with args; fetchurl { 
  url = http://mawercer.de/~nix/repos/git.tar.gz;
  sha256 = "1f0df3da8d6c9425ab80bd9c623570b7a35e5a622fbf56b903e1bf82a01d4e5f";}