{
  config,
  lib,
  extra_modules,
  ...
}: let
  cfg = config.vhack.persist;

  userDirectories = lib.debug.traceValSeqN 2 (lib.mapAttrs (_: dirs: {
      directories =
        dirs;
    })
    cfg.userDirectories);
in {
  options.vhack.persist = {
    enable = lib.mkEnableOption "persisting directories and files with impermanence";

    directories = lib.mkOption {
      type = lib.types.listOf (lib.types.either lib.types.str (lib.types.submodule {
        options = {
          directory = lib.mkOption {
            type = lib.types.str;
          };
          mode = lib.mkOption {
            type = lib.types.str;
          };
        };
      }));
      description = "The directories to persist";
    };

    userDirectories = lib.mkOption {
      type = lib.attrsOf lib.types.listOf (lib.types.either lib.types.str (lib.types.submodule {
        options = {
          directory = lib.mkOption {
            type = lib.types.str;
          };
          mode = lib.mkOption {
            type = lib.types.str;
          };
        };
      }));
      default = [];
      description = "The directories to persist, for each user.";
    };
  };

  imports = [
    extra_modules.nixos.impermanence
  ];

  config = lib.mkIf cfg.enable {
    environment.persistence."/srv" = {
      hideMounts = true;
      inherit (cfg) directories;

      users = userDirectories;

      files = [
        "/etc/machine-id"
      ];
    };
  };
}