python.pkgs.pydns: use py3dns 3.1.1a for python3

pkgs/top-level/python-packages.nix

@@ -22220,18 +22220,41 @@ in {
     doCheck = false;
   };
 
-  pydns = buildPythonPackage rec {
-    name = "pydns-2.3.6";
-    disabled = isPy3k;
+  pydns =
+    let
+      py3 = buildPythonPackage rec {
+        name = "${pname}-${version}";
+        pname = "py3dns";
+        version = "3.1.1a";
 
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/p/pydns/${name}.tar.gz";
-      sha256 = "0qnv7i9824nb5h9psj0rwzjyprwgfiwh5s5raa9avbqazy5hv5pi";
-    };
+        src = fetchPypi {
+          inherit pname version;
+          sha256 = "0z0qmx9j1ivpgg54gqqmh42ljnzxaychc5inz2gbgv0vls765smz";
+        };
 
-    doCheck = false;
+        preConfigure = ''
+          sed -i \
+            -e '/import DNS/d' \
+            -e 's/DNS.__version__/"${version}"/g' \
+            setup.py
+        '';
 
-  };
+        doCheck = false;
+      };
+
+      py2 = buildPythonPackage rec {
+        name = "${pname}-${version}";
+        pname = "pydns";
+        version = "2.3.6";
+
+        src = fetchPypi {
+          inherit pname version;
+          sha256 = "0qnv7i9824nb5h9psj0rwzjyprwgfiwh5s5raa9avbqazy5hv5pi";
+        };
+
+        doCheck = false;
+      };
+    in if isPy3k then py3 else py2;
 
   pythondaemon = buildPythonPackage rec {
     name = "python-daemon-${version}";