s4/dsdb: Set schemaInfo attribute value during provisioning

After provisioning new Forest, schemaInfo should be set
to a value with revision=1 and current invocation_id

source4/dsdb/schema/schema_info_attr.c

@@ -354,6 +354,55 @@ WERROR dsdb_schema_info_create(struct ldb_context *ldb, bool check_invocation_id
 }
 
 
+/**
+ *
+ * @param ldb
+ * @param schema
+ * @return
+ */
+WERROR dsdb_schema_info_reset(struct ldb_context *ldb, struct dsdb_schema *schema)
+{
+	int ldb_err;
+	WERROR werr;
+	DATA_BLOB blob;
+	struct dsdb_schema_info *schema_info;
+	struct ldb_message *msg;
+	TALLOC_CTX *temp_ctx;
+
+	temp_ctx = talloc_new(ldb);
+	W_ERROR_HAVE_NO_MEMORY(temp_ctx);
+
+	/* create default schemaInfo value */
+	werr = dsdb_schema_info_create(ldb, true, temp_ctx, &schema_info);
+	W_ERROR_NOT_OK_GOTO(werr, DONE);
+
+	/* serialize schemaInfo to be stored in LDB and schema cache */
+	werr = dsdb_blob_from_schema_info(schema_info, temp_ctx, &blob);
+	W_ERROR_NOT_OK_GOTO(werr, DONE);
+
+	/* store initial schemaInfo in DB */
+	werr = _dsdb_schema_info_write_prepare(ldb, &blob, temp_ctx, &msg);
+	W_ERROR_NOT_OK_GOTO(werr, DONE);
+
+	ldb_err = dsdb_modify(ldb, msg, DSDB_MODIFY_PERMISSIVE);
+	if (ldb_err != 0) {
+		DEBUG(0,("dsdb_module_schema_info_blob_write: dsdb_replace failed: %s (%s)\n",
+			 ldb_strerror(ldb_err),
+			 ldb_errstring(ldb)));
+		werr = WERR_INTERNAL_DB_ERROR;
+		goto DONE;
+	}
+
+	/* update dsdb_schema cache */
+	talloc_free(discard_const(schema->schema_info));
+	schema->schema_info = data_blob_hex_string_upper(schema, &blob);
+
+DONE:
+	talloc_free(temp_ctx);
+	return werr;
+}
+
+
 /**
  * Increments schemaInfo revision and save it to DB
  * setting our invocationID in the process

source4/scripting/python/pyglue.c

@@ -159,6 +159,30 @@ static PyObject *py_dsdb_write_prefixes_from_schema_to_ldb(PyObject *self, PyObj
 	Py_RETURN_NONE;
 }
 
+static PyObject *py_dsdb_schema_info_reset(PyObject *self, PyObject *args)
+{
+	PyObject *py_ldb;
+	struct ldb_context *ldb;
+	WERROR result;
+	struct dsdb_schema *schema;
+
+	if (!PyArg_ParseTuple(args, "O", &py_ldb))
+		return NULL;
+
+	PyErr_LDB_OR_RAISE(py_ldb, ldb);
+
+	schema = dsdb_get_schema(ldb, NULL);
+	if (!schema) {
+		PyErr_SetString(PyExc_RuntimeError, "Failed to set find a schema on ldb!\n");
+		return NULL;
+	}
+
+	result = dsdb_schema_info_reset(ldb, schema);
+	PyErr_WERROR_IS_ERR_RAISE(result);
+
+	Py_RETURN_NONE;
+}
+
 static PyObject *py_dsdb_set_schema_from_ldb(PyObject *self, PyObject *args)
 {
 	PyObject *py_ldb;
@@ -253,6 +277,8 @@ static PyMethodDef py_misc_methods[] = {
 		NULL },
 	{ "dsdb_write_prefixes_from_schema_to_ldb", (PyCFunction)py_dsdb_write_prefixes_from_schema_to_ldb, METH_VARARGS,
 		NULL },
+	{ "dsdb_schema_info_reset", (PyCFunction)py_dsdb_schema_info_reset, METH_VARARGS,
+		"Reset schemaInfo value to default for a new Forest" },
 	{ "dsdb_set_schema_from_ldb", (PyCFunction)py_dsdb_set_schema_from_ldb, METH_VARARGS,
 		NULL },
 	{ "set_debug_level", (PyCFunction)py_set_debug_level, METH_VARARGS,

source4/scripting/python/samba/__init__.py

@@ -283,6 +283,9 @@ class Ldb(_Ldb):
     def write_prefixes_from_schema(self):
         _glue.dsdb_write_prefixes_from_schema_to_ldb(self)
 
+    def set_schema_info(self):
+        _glue.dsdb_schema_info_reset(self)
+
     def convert_schema_to_openldap(self, target, mapping):
         return dsdb.dsdb_convert_schema_to_openldap(self, target, mapping)
 

source4/scripting/python/samba/provision.py

@@ -945,6 +945,8 @@ def setup_samdb(path, setup_path, session_info, provision_backend, lp,
         message("Setting up sam.ldb schema")
         samdb.add_ldif(schema.schema_dn_add, controls=["relax:0"])
         samdb.modify_ldif(schema.schema_dn_modify)
+        # set schemaInfo to defalt value for a new Forest
+        samdb.set_schema_info()
         samdb.write_prefixes_from_schema()
         samdb.add_ldif(schema.schema_data, controls=["relax:0"])
         setup_add_ldif(samdb, setup_path("aggregate_schema.ldif"),