Package our own Twisted 19.10

nix/overlays.nix

@@ -15,6 +15,9 @@ self: super: {
       # Need version of pyutil that supports Python 3. The version in 19.09
       # is too old.
       pyutil = python-super.callPackage ./pyutil.nix { };
+
+      # Need a newer version of Twisted, too.
+      twisted = python-super.callPackage ./twisted.nix { };
     };
   };
 }

nix/twisted.nix

@@ -0,0 +1,63 @@
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, python
+, zope_interface
+, incremental
+, automat
+, constantly
+, hyperlink
+, pyhamcrest
+, attrs
+, pyopenssl
+, service-identity
+, setuptools
+, idna
+, bcrypt
+}:
+buildPythonPackage rec {
+  pname = "Twisted";
+  version = "19.10.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    extension = "tar.bz2";
+    sha256 = "7394ba7f272ae722a74f3d969dcf599bc4ef093bc392038748a490f1724a515d";
+  };
+
+  propagatedBuildInputs = [ zope_interface incremental automat constantly hyperlink pyhamcrest attrs setuptools bcrypt ];
+
+  passthru.extras.tls = [ pyopenssl service-identity idna ];
+
+  # Patch t.p._inotify to point to libc. Without this,
+  # twisted.python.runtime.platform.supportsINotify() == False
+  patchPhase = stdenv.lib.optionalString stdenv.isLinux ''
+    substituteInPlace src/twisted/python/_inotify.py --replace \
+      "ctypes.util.find_library('c')" "'${stdenv.glibc.out}/lib/libc.so.6'"
+  '';
+
+  # Generate Twisted's plug-in cache.  Twisted users must do it as well.  See
+  # http://twistedmatrix.com/documents/current/core/howto/plugin.html#auto3
+  # and http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=477103 for
+  # details.
+  postFixup = ''
+    $out/bin/twistd --help > /dev/null
+  '';
+
+  checkPhase = ''
+    ${python.interpreter} -m unittest discover -s twisted/test
+  '';
+  # Tests require network
+  doCheck = false;
+
+  meta = with stdenv.lib; {
+    homepage = https://twistedmatrix.com/;
+    description = "Twisted, an event-driven networking engine written in Python";
+    longDescription = ''
+      Twisted is an event-driven networking engine written in Python
+      and licensed under the MIT license.
+    '';
+    license = licenses.mit;
+    maintainers = [ ];
+  };
+}