python2.pkgs.dulwich: keep 0.19.16 for python 2

pkgs/development/python-modules/dulwich/0_19.nix

@@ -0,0 +1,30 @@
+{ stdenv, buildPythonPackage, fetchPypi
+, urllib3, certifi
+, gevent, geventhttpclient, mock, fastimport
+, git, glibcLocales }:
+
+buildPythonPackage rec {
+  version = "0.19.16";
+  pname = "dulwich";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "f74561c448bfb6f04c07de731c1181ae4280017f759b0bb04fa5770aa84ca850";
+  };
+
+  LC_ALL = "en_US.UTF-8";
+
+  propagatedBuildInputs = [ urllib3 certifi ];
+
+  # Only test dependencies
+  checkInputs = [ git glibcLocales gevent geventhttpclient mock fastimport ];
+
+  doCheck = !stdenv.isDarwin;
+
+  meta = with stdenv.lib; {
+    description = "Simple Python implementation of the Git file formats and protocols";
+    homepage = "https://samba.org/~jelmer/dulwich/";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ koral ];
+  };
+}

pkgs/top-level/python-packages.nix

@@ -3652,9 +3652,10 @@ in {
     duckdb = pkgs.duckdb;
   };
 
-  dulwich = callPackage ../development/python-modules/dulwich {
+  dulwich = if isPy3k then
-    inherit (pkgs) git glibcLocales;
+    callPackage ../development/python-modules/dulwich { }
-  };
+  else
+    callPackage ../development/python-modules/dulwich/0_19.nix { };
 
   hg-git = callPackage ../development/python-modules/hg-git { };