Beets BPM plugin

Help
1

Looking for some help getting an external beets plugin working.

In home manager I have an override

    bpmanalyser = {
        enable = true;
        propagatedBuildInputs = [pkgs.beets-bpmanalyser];
      };

which points to a custom local package

{
  python3Packages,
  fetchurl,
  lib,
  pkgs,
}:

python3Packages.buildPythonPackage rec {
  pname = "beets-bpmanalyser";
  version = "1.5.9";
  src = pkgs.fetchPypi {
    inherit version;
    pname = "beets_bpmanalyser"; #name in pip uses _ not -
    sha256 = "sha256-iWXSELGRHI4ak1MTWCSdRiyPz618fyBSzKw/FeJigZ4="; 
  };
 
  propagatedBuildInputs = with pkgs.python3Packages; [ numpy aubio pydub];

  nativeBuildInputs = [ pkgs.ffmpeg pkgs.beets ];
  
  doCheck = false; #bodgy way to get rid of pip error
    
  meta = with pkgs.lib; {
    description = "A BPM analyzer plugin for Beets music library manager";
    homepage = "https://github.com/adamjakab/BeetsPluginBpmAnalyser";
    license = licenses.mit;
  };
}

And after rebuilding home-manager I can see the plugin in beets

beets version 1.6.0
Python version 3.11.9
plugins: albumtypes, bpmanalyser,…

But when I try to run the plugin I get the following.

bpmanalyser: Error(1): Unknown error! Unparsable response.

Any ideas welcome.

2

This is more of a python question than a nix question at this point; you’d have to look at the upstream python code and figure out why that “unknown error” is occurring.

3

Wierdly it looks like the resulting python package/plugin can’t see the pydub python module and throws a ModuleNotFoundError: No module named 'pydub' error.

As far as I can see, because this program uses threads and is calling part of itself via popen call, i’m losing the pythonpath in the subprocess.

4

Had to modify the python subprocess call to pass the sys.path to the subprocess to make it work.
If anyone has a way to do this without modifying the upstream code that would be awesome.

    # Pass the current environment variables to the subprocess
    env = os.environ.copy()
    env["PYTHONPATH"] = ":".join(sys.path)
    
    proc = Popen([sys.executable, self.analyser_script_path, item_path],
                 stdout=PIPE, stderr=PIPE, env=env)