pythonPackages.unittest2: refactor move to python-modules

pkgs/development/python-modules/unittest2/default.nix

···
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, six
+, traceback2
+}:
+
+buildPythonPackage rec {
+  version = "1.1.0";
+  pname = "unittest2";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0y855kmx7a8rnf81d3lh5lyxai1908xjp0laf4glwa4c8472m212";
+  };
+
+  propagatedBuildInputs = [ six traceback2 ];
+
+  # # 1.0.0 and up create a circle dependency with traceback2/pbr
+  doCheck = false;
+
+  postPatch = ''
+    # argparse is needed for python < 2.7, which we do not support anymore.
+    substituteInPlace setup.py --replace "argparse" ""
+
+    # # fixes a transient error when collecting tests, see https://bugs.launchpad.net/python-neutronclient/+bug/1508547
+    sed -i '510i\        return None, False' unittest2/loader.py
+    # https://github.com/pypa/packaging/pull/36
+    sed -i 's/version=VERSION/version=str(VERSION)/' setup.py
+  '';
+
+  meta = with stdenv.lib; {
+    description = "A backport of the new features added to the unittest testing framework";
+    homepage = https://pypi.python.org/pypi/unittest2;
+    license = licenses.bsd0;
+  };
+
+}

pkgs/top-level/python-packages.nix

···
 
   unicodecsv = callPackage ../development/python-modules/unicodecsv { };
 
-  unittest2 = buildPythonPackage rec {
-    version = "1.1.0";
-    name = "unittest2-${version}";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/u/unittest2/unittest2-${version}.tar.gz";
-      sha256 = "0y855kmx7a8rnf81d3lh5lyxai1908xjp0laf4glwa4c8472m212";
-    };
-
-    # # 1.0.0 and up create a circle dependency with traceback2/pbr
-    doCheck = false;
-
-    postPatch = ''
-      # argparse is needed for python < 2.7, which we do not support anymore.
-      substituteInPlace setup.py --replace "argparse" ""
-
-      # # fixes a transient error when collecting tests, see https://bugs.launchpad.net/python-neutronclient/+bug/1508547
-      sed -i '510i\        return None, False' unittest2/loader.py
-      # https://github.com/pypa/packaging/pull/36
-      sed -i 's/version=VERSION/version=str(VERSION)/' setup.py
-    '';
-
-    propagatedBuildInputs = with self; [ six traceback2 ];
-
-    meta = {
-      description = "A backport of the new features added to the unittest testing framework";
-      homepage = https://pypi.python.org/pypi/unittest2;
-    };
-  };
+  unittest2 = callPackage ../development/python-modules/unittest2 { };
 
     unittest-xml-reporting = callPackage ../development/python-modules/unittest-xml-reporting { };