1  let
2    obeliskSrc = fetchGit {
3      url = "https://github.com/obsidiansystems/obelisk.git";
4      ref = "release/1.3.0.0";
5      rev = "58c04270d606c061e7ffd2f16345e0f451eba600";
6    };
7  in
8  (import obeliskSrc { }).shell