python.pkgs.hglib: use patch to specify hg path (#57926)

pkgs/development/python-modules/hglib/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchPypi, nose, mercurial, isPy3k }:
+{ stdenv, buildPythonPackage, fetchPypi, substituteAll, python, nose, mercurial }:
 
 buildPythonPackage rec {
   pname = "python-hglib";
@@ -9,11 +9,18 @@ buildPythonPackage rec {
     sha256 = "7c1fa0cb4d332dd6ec8409b04787ceba4623e97fb378656f7cab0b996c6ca3b2";
   };
 
-  checkInputs = [ nose ];
-  buildInputs = [ mercurial ];
+  patches = [
+    (substituteAll {
+      src = ./hgpath.patch;
+      hg = "${mercurial}/bin/hg";
+    })
+  ];
 
-  checkPhase = ''python test.py'';
-  doCheck = if isPy3k then false else true;
+  checkInputs = [ nose ];
+
+  checkPhase = ''
+    ${python.interpreter} test.py --with-hg "${mercurial}/bin/hg"
+  '';
 
   meta = with stdenv.lib; {
     description = "Mercurial Python library";