openopc: new package

"OPC (OLE for Process Control) toolkit designed for use with Python"

This package contains a python module (OpenOPC) and a command line
client (opc). The OpenOPC Gateway Service for Windows is also copied to
$out, for reference.

It only works with python2.7 (not python3.x), so I'm not adding it to
python-packages.nix.

Also add needed dependency, python-pyro3, a distributed object
middleware for Python (IPC/RPC).

http://openopc.sourceforge.net/

pkgs/tools/misc/openopc/default.nix

···
+{ stdenv, fetchurl, pythonFull }:
+
+stdenv.mkDerivation rec {
+  name = "openopc-${version}";
+  version = "1.2.0";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/project/openopc/openopc/${version}/OpenOPC-${version}.source.tar.bz2";
+    sha256 = "0mm77fiipz5zy82l6pr3wk18bfril81milv2rdxr954c4gw5smyd";
+  };
+
+  # There is no setup.py or any other "build system" file in the source archive.
+  installPhase = ''
+    mkdir -p "$out/bin"
+    mkdir -p "$out/share/doc/openopc"
+    mkdir -p "$out/${pythonFull.python.sitePackages}"
+    mkdir -p "$out/libexec/opc"
+
+    cp src/OpenOPC.py "$out/${pythonFull.python.sitePackages}"
+    cp src/opc.py "$out/libexec/opc/"
+
+    cat > "$out/bin/opc" << __EOF__
+    #!${stdenv.shell}
+    export PYTHONPATH="$out/${pythonFull.python.sitePackages}"
+    exec ${pythonFull}/bin/${pythonFull.python.executable} "$out/libexec/opc/opc.py" "\$@"
+    __EOF__
+    chmod a+x "$out/bin/opc"
+
+    cp -R *.txt doc/* "$out/share/doc/openopc/"
+
+    # Copy these MS Windows tools, for reference.
+    cp src/OpenOPCService.py src/SystemHealth.py "$out/libexec/opc/"
+  '';
+
+  meta = with stdenv.lib; {
+    description = "OPC (OLE for Process Control) toolkit designed for use with Python";
+    homepage = http://openopc.sourceforge.net/;
+    # """OpenOPC for Python is freely available under the terms of the GNU GPL.
+    # However, the OpenOPC library module is licensed under the "GPL + linking
+    # exception" license, which generally means that programs written using the
+    # OpenOPC library may be licensed under any terms."""
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.bjornfor ];
+  };
+}

pkgs/top-level/all-packages.nix

···
 
   openobex = callPackage ../tools/bluetooth/openobex { };
 
+  openopc = callPackage ../tools/misc/openopc {
+    pythonFull = python27Full.override {
+      extraLibs = [ python27Packages.pyro3 ];
+    };
+  };
+
   openresolv = callPackage ../tools/networking/openresolv { };
 
   opensc = callPackage ../tools/security/opensc { };

pkgs/top-level/python-packages.nix

···
     };
   });
 
+  pyro3 = buildPythonPackage (rec {
+    name = "Pyro-3.16";
+
+    src = fetchurl {
+      url = "http://pypi.python.org/packages/source/P/Pyro/${name}.tar.gz";
+      md5 = "59d4d3f4a8786776c9d7f9051b8f1a69";
+    };
+
+    meta = with stdenv.lib; {
+      description = "Distributed object middleware for Python (IPC/RPC)";
+      homepage = http://pythonhosted.org/Pyro/;
+      license = licenses.mit;
+      platforms = platforms.unix;
+      maintainers = [ maintainers.bjornfor ];
+    };
+  });
+
   pyrss2gen = buildPythonPackage (rec {
     name = "PyRSS2Gen-1.0.0";