
This allows you to specify the system-wide flake registry. One use is to pin 'nixpkgs' to the Nixpkgs version used to build the system: nix.registry.nixpkgs.flake = nixpkgs; where 'nixpkgs' is a flake input. This ensures that commands like $ nix run nixpkgs#hello pull in a minimum of additional store paths. You can also use this to redirect flakes, e.g. nix.registry.nixpkgs.to = { type = "github"; owner = "my-org"; repo = "my-nixpkgs"; };
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.