nixos/modules/security/install.nix

   1 { pkgs, lib, config, ... }:
   2 let inherit (lib) types; in
   3 {
   4 options.security.install = {
   5   shellHook = lib.mkOption {
   6     type = types.lines;
   7     default = "";
   8   };
   9   # TODO: more structured options, like NixOps' deployment.keys
  10 };
  11 }