Don't schedule periodic update checks for non-official builds.

utils.h

 // 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.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__
 
 #include <errno.h>
 #include <algorithm>
 #include <set>
 #include <string>
 #include <vector>
 #include <glib.h>
 #include "update_engine/action.h"
 #include "update_engine/action_processor.h"
 
 namespace chromeos_update_engine {
 
 namespace utils {
 
+// Returns true if this is an official Chrome OS build, false
+// otherwise. Currently, this routine errs on the official build side
+// -- if it doesn't recognize the update track as non-official, it
+// assumes the build is official.
+bool IsOfficialBuild();
+
 // Writes the data passed to path. The file at path will be overwritten if it
 // exists. Returns true on success, false otherwise.
 bool WriteFile(const char* path, const char* data, int data_len);
 
 // Calls write() or pwrite() repeatedly until all count bytes at buf are
 // written to fd or an error occurs. Returns true on success.
 bool WriteAll(int fd, const void* buf, size_t count);
 bool PWriteAll(int fd, const void* buf, size_t count, off_t offset);
 
 // Calls pread() repeatedly until count bytes are read, or EOF is reached.
@@ skipping 263 matching lines @@
     bool _success = (_x);                                                      \
     if (!_success) {                                                           \
       LOG(ERROR) << #_x " failed.";                                            \
       return;                                                                  \
     }                                                                          \
   } while (0)
 
 
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__