3   nix.settings.experimental-features = [ "nix-command" "flakes" ];
 
   4   #nix.registry.self.flake = inputs.self;
 
   5   # Pin the rev to the revision of the public Nixpkgs that the system was built from.
 
   6   # This is the version which will be locked by flakes using flake:nixpkgs
 
   7   nix.registry.nixpkgs = {
 
   8     from = { id = "nixpkgs"; type = "indirect"; };
 
  12       inherit (inputs.nixpkgs) rev;
 
  17     "nixpkgs=${inputs.nixpkgs}"