{ invalidateFetcherByDrvHash, fetchgit, ... }: { simple = invalidateFetcherByDrvHash fetchgit { name = "nix-source"; url = "https://github.com/NixOS/nix"; rev = "9d9dbe6ed05854e03811c361a3380e09183f4f4a"; sha256 = "sha256-7DszvbCNTjpzGRmpIVAWXk20P0/XTrWZ79KSOGLrUWY="; }; }