thesirvpnmod.nix

let
  eval = (import <nixpkgs/lib/modules.nix> { inherit lib; }).evalModules;
  lib = (import <nixpkgs> {}).lib;

  module = { config, lib, ... }:
    with lib;
    let cfg = config.perso.vpn;
    in {
      options.perso.vpn = mkOption {
        type = with types; attrsOf (submodule
          {
            options = {
              peers = mkOption {
                default = [ { name = "Machine A"; vpnIP = "10.10.1.2"; } ];
                type = with types; listOf (submodule
                  {
                    options = {

                      name = mkOption {
                        type = types.str;
                        default = "fake";
                      };

                      vpnIP = mkOption {
                        type = types.str;
                        description = "IP address of the node in the VPN.";
                      };
                    };
                  }
                );
              };
            };
          }
        );
      };
    };
in

(eval {
  modules = [
    module
    { config.perso.vpn.foo = {}; }
  ];
}).config