mininet: init at 2.3.0d4 (#41261)

Mininet (https://github.com/mininet/mininet) is a popular network emulator that
glues several components such as network namespaces, traffic control
commands into a set of python bindings. It is then "easy" to describe a
topology and run experiments on it.

pkgs/tools/virtualization/mininet/default.nix

@@ -0,0 +1,48 @@
+{ stdenv, lib, fetchFromGitHub
+, which
+, python
+, help2man
+}:
+
+let
+  pyEnv = python.withPackages(ps: [ ps.setuptools ]);
+in
+stdenv.mkDerivation rec {
+  name = "mininet-${version}";
+  version = "2.3.0d4";
+
+  outputs = [ "out" "py" ];
+
+  src = fetchFromGitHub {
+    owner = "mininet";
+    repo = "mininet";
+    rev = version;
+    sha256 = "02hsqa7r5ykj8m1ycl32xwn1agjrw78wkq87xif0dl2vkzln41i4";
+  };
+
+  buildFlags = [ "mnexec" ];
+  makeFlags = [ "PREFIX=$(out)" ];
+
+  pythonPath = [ python.pkgs.setuptools ];
+  buildInputs = [ python which help2man ];
+
+  installTargets = [ "install-mnexec" "install-manpages" ];
+
+  preInstall = ''
+    mkdir -p $out $py
+    # without --root, install fails
+    ${pyEnv.interpreter} setup.py install --root="/" --prefix=$py
+  '';
+
+  doCheck = false;
+
+
+  meta = with lib; {
+    description = "Emulator for rapid prototyping of Software Defined Networks";
+    license = {
+      fullName = "Mininet 2.3.0d4 License";
+    };
+    homepage = https://github.com/mininet/mininet;
+    maintainers = with maintainers; [ teto ];
+  };
+}