we are able to parse str to int in the kernel

scripts/yt-block/app.nix

@@ -3,11 +3,13 @@
 }: let
   python = pkgs.python3.withPackages (ps: with ps; [pkgs.python311Packages.cryptography]);
 	python_script = pkgs.writeText "main-py" (builtins.readFile ./main.py);
+  read-helper = pkgs.callPackage ./read-helper.nix {};
 in pkgs.writeShellApplication {
   name = "yt_block";
   runtimeInputs = with pkgs; [ iptables bash gnugrep ps util-linux ];
   text = ''
     export PYTHON=${python}/bin/python
+    export READ_HELPER=${read-helper}/bin/read-helper
     ${python}/bin/python ${python_script} "$@"
   '';
 }