AU: Provide a reboot_if_needed D-Bus API.

update_attempter.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 "update_engine/update_attempter.h"
 
 // From 'man clock_gettime': feature test macro: _POSIX_C_SOURCE >= 199309L
 #ifndef _POSIX_C_SOURCE
 #define _POSIX_C_SOURCE 199309L
 #endif  // _POSIX_C_SOURCE
@@ skipping 203 matching lines @@
 void UpdateAttempter::CheckForUpdate(const std::string& app_version,
                                      const std::string& omaha_url) {
   if (status_ != UPDATE_STATUS_IDLE) {
     LOG(INFO) << "Check for update requested, but status is "
               << UpdateStatusToString(status_) << ", so not checking.";
     return;
   }
   Update(app_version, omaha_url);
 }
 
+bool UpdateAttempter::RebootIfNeeded() {
+  if (status_ != UPDATE_STATUS_UPDATED_NEED_REBOOT) {
+    LOG(INFO) << "Reboot requested, but status is "
+              << UpdateStatusToString(status_) << ", so not rebooting.";
+    return false;
+  }
+  TEST_AND_RETURN_FALSE(utils::Reboot());
+  return true;
+}
+
 // Delegate methods:
 void UpdateAttempter::ProcessingDone(const ActionProcessor* processor,
                                      ActionExitCode code) {
   CHECK(response_handler_action_);
   LOG(INFO) << "Processing Done.";
   actions_.clear();
 
   if (status_ == UPDATE_STATUS_REPORTING_ERROR_EVENT) {
     LOG(INFO) << "Error event sent.";
     SetStatusAndNotify(UPDATE_STATUS_IDLE);
@@ skipping 149 matching lines @@
                              error_event_.release(),  // Pass ownership.
                              new LibcurlHttpFetcher));
   actions_.push_back(shared_ptr<AbstractAction>(error_event_action));
   processor_.EnqueueAction(error_event_action.get());
   SetStatusAndNotify(UPDATE_STATUS_REPORTING_ERROR_EVENT);
   processor_.StartProcessing();
   return true;
 }
 
 }  // namespace chromeos_update_engine