[login_manager] Code to add the owner to the whitelist in a device policy

system_utils.cc

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "login_manager/system_utils.h"
 
 #include <dbus/dbus-glib-lowlevel.h>
 #include <errno.h>
 #include <glib.h>
 #include <signal.h>
@@ skipping 130 matching lines @@
 }
 
 void SystemUtils::AppendToClobberLog(const char* msg) const {
   chromeos::ProcessImpl appender;
   appender.AddArg("/sbin/clobber-log");
   appender.AddArg("--");
   appender.AddArg(msg);
   appender.Run();
 }
 
+void SystemUtils::SetGError(GError** error,
+                            ChromeOSLoginError code,
+                            const char* message) {
+  g_set_error(error, CHROMEOS_LOGIN_ERROR, code, "Login error: %s", message);
+}
+
+void SystemUtils::SetAndSendGError(ChromeOSLoginError code,
+                                   DBusGMethodInvocation* context,
+                                   const char* msg) {
+  GError* error = NULL;
+  SetGError(&error, code, msg);
+  dbus_g_method_return_error(context, error);
+  g_error_free(error);
+}
+
 }  // namespace login_manager