{
  config,
  lib,
  osConfig,
  ...
}: let
  cfg = config.impermanence;
in {
  options.impermanence = {
    enable = lib.mkEnableOption "impermanence for home directory";
    fallbackPersistence.enable = lib.mkOption {
      type = lib.types.bool;
      default = true;
    };
  };

  config = lib.mkMerge [
    (lib.mkIf config.impermanence.enable {
      assertions = [
        {
          assertion = osConfig.host.impermanence.enable;
          message = "impermanence can not be enabled for a user when it is not enabled for the system";
        }
      ];
    })
    # If impermanence is not enabled for this user but system impermanence is enabled,
    # persist the entire home directory as fallback
    (lib.mkIf (osConfig.host.impermanence.enable && !cfg.enable && cfg.fallbackPersistence.enable) {
      home.persistence."/persist/home/${config.home.username}" = {
        directories = ["."];
        allowOther = true;
      };
    })
  ];
}