fix avahi

packages/python/python-nanokvm/default.nix

@@ -1,19 +1,25 @@
 {
+  lib,
+  namespace,
+  pkgs,
   python3Packages,
-  fetchFromGitHub,
   ...
 }:
-python3Packages.buildPythonPackage rec {
+let
+  inherit (lib.trivial) importJSON;
+  inherit (lib.${namespace}) selectVariant mkAllSources;
+
+  versionSpec = importJSON ./version.json;
+  selected = selectVariant versionSpec null null;
+  sources = mkAllSources pkgs selected;
+  src-meta = selected.sources."python-nanokvm";
+in
+python3Packages.buildPythonPackage {
   pname = "nanokvm";
-  version = "0.1.0";
+  version = if src-meta ? tag then src-meta.tag else src-meta.rev;
   format = "pyproject";
 
-  src = fetchFromGitHub {
-    owner = "puddly";
-    repo = "python-${pname}";
-    rev = "v${version}";
-    sha256 = "sha256-vIxvQtjaInnWQce7syiOWpP2kaw0IVw03HPovnB2J5M=";
-  };
+  src = sources."python-nanokvm";
 
   prePatch = ''
         rm -f pyproject.toml