nixos/modules/flake.nix


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{ config, pkgs, unstable, unstable-small, nixpkgs-2111, lib, ... }:

let
  base = "/etc/nixpkgs/channels";
  nixpkgsPath = "${base}/nixpkgs";
  nixpkgsUnstablePath = "${base}/nixpkgsUnstable";
  nixpkgs2111Path = "${base}/nixpkgs2111";
in
{
  options.nix.flakes.enable = lib.mkEnableOption "nix flakes";

  config = lib.mkIf config.nix.flakes.enable {
    nix = {
      package = pkgs.nixUnstable;
      experimentalFeatures = "nix-command flakes";

      registry.nixpkgs.flake = unstable-small;
      registry.nixpkgsUnstable.flake = unstable;
      registry.nixpkgs2111.flake = nixpkgs-2111;

      nixPath = [
        "nixpkgs=${nixpkgsPath}"
        "nixpkgsUnstable=${nixpkgsUnstablePath}"
        "nixpkgs2111=${nixpkgs2111Path}"
        "/nix/var/nix/profiles/per-user/root/channels"
      ];
    };

    systemd.tmpfiles.rules = [
      "L+ ${nixpkgsPath}         - - - - ${unstable-small}"
      "L+ ${nixpkgsUnstablePath} - - - - ${unstable}"
      "L+ ${nixpkgs2111Path} - - - - ${nixpkgs-2111}"
    ];
  };
}