Trying to build custom HomeAssistant component leads to infinite recursion

Help
1

Hi all,

I use Nixos to run my Raspberry Pi4-based Home Assistant installation. Nixos supports a bunch of custom components out of the box, but I want to install one that isn’t pre-packaged: GitHub - zachowj/hass-node-red: Companion Component for node-red-contrib-home-assistant-websocket to help integrate Node-RED with Home Assistant Core

I figured this would be as easy as copying the definition of one of the prepacked ones (like this one) into my config, replacing the values with the appropriate ones for the component I need (see the result here), and running nixos-rebuild.

Unfortunately it doesn’t seem to be that simple, as including the file yields an “infinite recursion” error. I’m a relative Nixos n00b and have no idea where to start debugging the problem. Anyone have any tips?

The error:

       error: infinite recursion encountered
       at /nix/store/fz4h8yz3qr83p6cfhisgj02knjqg6nxs-source/lib/modules.nix:515:28:
          514|         addErrorContext (context name)
          515|           (args.${name} or config._module.args.${name})
             |                            ^
          516|       ) (functionArgs f);

Regards,
Maarten

2

This is just a wild guess, but your reference doesn’t inherit owner but doubly defines it. Have you tried doing the same?

3

I fixed the package to build in nixpkgs. That doesn’t explain why there is an infinite recursion for you though.

{
  lib,
  buildHomeAssistantComponent,
  fetchFromGitHub,
  ...
}:

buildHomeAssistantComponent rec {
  owner = "zachowj";
  domain = "nodered";
  version = "4.1.2";

  src = fetchFromGitHub {
    inherit owner;
    repo = "hass-node-red";
    tag = "v${version}";
    hash = "sha256-qRQ4NMKmZUQ9wSYR8i8TPbQc3y69Otp7FSdGuwph14c=";
  };

  meta = with lib; {
    description = "Companion Component for node-red-contrib-home-assistant-websocket";
    homepage = "https://github.com/zachowj/hass-node-red/";
    changelog = "https://github.com/zachowj/hass-node-red/releases/tag/${version}";
    license = licenses.mit;
  };
}

custom_components/
custom_components/__init__.py
custom_components/nodered/
custom_components/nodered/__init__.py
custom_components/nodered/binary_sensor.py
custom_components/nodered/button.py
custom_components/nodered/config_flow.py
custom_components/nodered/const.py
custom_components/nodered/discovery.py
custom_components/nodered/manifest.json
custom_components/nodered/number.py
custom_components/nodered/select.py
custom_components/nodered/sensor.py
custom_components/nodered/sentence.py
custom_components/nodered/services.yaml
custom_components/nodered/switch.py
custom_components/nodered/text.py
custom_components/nodered/time.py
custom_components/nodered/translations/
custom_components/nodered/translations/de.json
custom_components/nodered/translations/dk.json
custom_components/nodered/translations/en.json
custom_components/nodered/translations/fr.json
custom_components/nodered/translations/nb.json
custom_components/nodered/translations/pl.json
custom_components/nodered/translations/pt-BR.json
custom_components/nodered/translations/pt-pt.json
custom_components/nodered/translations/sk.json
custom_components/nodered/translations/sv.json
custom_components/nodered/translations/zh-CN.json
custom_components/nodered/utils.py
custom_components/nodered/version.py
custom_components/nodered/websocket.py
nix-support/
nix-support/propagated-build-inputs
4

You cannot import a package like a module. Try the following instead:

services.home-assistant.customComponents = [
  (config.services.home-assistant.package.python.pkgs.callPackage ./hass-node-red-module.nix {})
];
5

That was it. Thank you!