s3-param: Add python wrapper for s3 parameters

This provids a get_context() method to return s3 context as s4 context type.

Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>

source3/param/pyparam.c

@@ -0,0 +1,87 @@
+/*
+   Unix SMB/CIFS implementation.
+   Samba utility functions
+   Copyright (C) Amitay Isaacs <amitay@gmail.com> 2011
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <Python.h>
+#include "includes.h"
+#include "param/param.h"
+#include "param/loadparm.h"
+#include "lib/talloc/pytalloc.h"
+
+static PyTypeObject *loadparm_Type = NULL;
+
+void initparam(void);
+
+static PyObject *py_get_context(PyObject *self)
+{
+	PyObject *py_loadparm;
+	const struct loadparm_s3_context *s3_context;
+	const struct loadparm_context *s4_context;
+	TALLOC_CTX *mem_ctx;
+
+	mem_ctx = talloc_new(NULL);
+	if (mem_ctx == NULL) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	s3_context = loadparm_s3_context();
+
+	s4_context = loadparm_init_s3(mem_ctx, s3_context);
+	if (s4_context == NULL) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	py_loadparm = pytalloc_steal(loadparm_Type, discard_const_p(struct loadparm_context, s4_context));
+	if (py_loadparm == NULL) {
+		talloc_free(mem_ctx);
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	talloc_free(mem_ctx);
+
+	return py_loadparm;
+}
+
+static PyMethodDef pyparam_methods[] = {
+    { "get_context", (PyCFunction)py_get_context, METH_NOARGS,
+        "Returns LoadParm context." },
+    { NULL }
+};
+
+void initparam(void)
+{
+	PyObject *m, *mod;
+
+	m = Py_InitModule3("param", pyparam_methods, "Parsing and writing Samba3 configuration files.");
+	if (m == NULL)
+		return;
+
+	mod = PyImport_ImportModule("samba.param");
+	if (mod == NULL) {
+		return;
+	}
+
+	loadparm_Type = (PyTypeObject *)PyObject_GetAttrString(mod, "LoadParm");
+	Py_DECREF(mod);
+	if (loadparm_Type == NULL) {
+		return;
+	}
+}

source3/wscript_build

@@ -753,6 +753,13 @@ bld.SAMBA3_SUBSYSTEM('param',
                    source=PARAM_WITHOUT_REG_SRC,
                    deps='samba-util PARAM_UTIL smbd_conn ldap lber LOADPARM_CTX samba3core smbconf param_local_h param/param_global_h''')
 
+if bld.env.toplevel_build:
+    bld.SAMBA3_PYTHON('pys3param',
+                      source='param/pyparam.c',
+                      deps='param',
+                      public_deps='samba-hostconfig pytalloc talloc',
+                      realname='samba/samba3/param.so')
+    
 bld.SAMBA3_SUBSYSTEM('param_service',
                      source='param/service.c',
                      deps = 'USER_UTIL param USER_UTIL PRINTING')