FileTote?

common/user-facing.nix

@@ -92,12 +92,13 @@
 
     (beets.override {
       pluginOverrides = {
-        extrafiles = {
+        filetote = {
           enable = true;
-          propagatedBuildInputs = [ beetsPackages.extrafiles ];
+          propagatedBuildInputs = [ (callPackage ../packages/beets-filetote.nix { beets = beetsPackages.beets-minimal; }) ];
         };
       };
-    })
+    }
+    )
 
     (gnuplot.override { withQt = true; })
   ];

packages/beets-filetote.nix

@@ -0,0 +1,36 @@
+{ lib, fetchFromGitHub, beets, python3Packages }:
+
+python3Packages.buildPythonApplication rec {
+  pname = "beets-filetote";
+  version = "0.4.9";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    repo = "${pname}";
+    owner = "gtronset";
+    rev = "v${version}";
+    sha256 = "sha256-pZ6c2XQMSiiPHyZMLSiSE+LXeCfi3HEWtsTK5DP9YZE=";
+  };
+
+  nativeBuildInputs = [
+    beets
+    python3Packages.poetry-core
+  ];
+
+  nativeCheckInputs = with python3Packages; [
+    pytestCheckHook
+    pytest-cov
+    mock
+    typeguard
+  ];
+  preCheck = ''
+    export HOME=$(mktemp -d)
+  '';
+
+  meta = with lib; {
+    description = "Beets plugin that manages non-music extra files";
+    homepage = "https://github.com/gtronset/beets-filetote";
+    # maintainers = with maintainers; [ aszlig lovesegfault ];
+    license = licenses.mit;
+  };
+}