For actions, switch bool success into an exit code.

postinstall_runner_action.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium 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/postinstall_runner_action.h"
 #include <sys/mount.h>
 #include <stdlib.h>
 #include <vector>
 #include "update_engine/subprocess.h"
 #include "update_engine/utils.h"
 
 namespace chromeos_update_engine {
 
 using std::string;
 using std::vector;
 
 namespace {
 const string kPostinstallScript("/postinst");
 }
 
 void PostinstallRunnerAction::PerformAction() {
   CHECK(HasInputObject());
   const InstallPlan install_plan = GetInputObject();
   const string install_device = install_plan.install_path;
   ScopedActionCompleter completer(processor_, this);
-  
+
   // Make mountpoint
   string temp_dir;
   TEST_AND_RETURN(utils::MakeTempDirectory("/tmp/au_postint_mount.XXXXXX",
                                            &temp_dir));
   ScopedDirRemover temp_dir_remover(temp_dir);
 
   {
     // Scope for the mount
     unsigned long mountflags = MS_RDONLY;
 
@@ skipping 27 matching lines @@
     bool success = (rc == 0);
     if (!success) {
       LOG(ERROR) << "Postinst command failed with code: " << rc;
       return;
     }
   }
 
   if (HasOutputPipe()) {
     SetOutputObject(install_plan);
   }
-  completer.set_success(true);
+  completer.set_code(kActionCodeSuccess);
 }
 
 }  // namespace chromeos_update_engine