AU: FilesystemCopierAction: copy bit-exactly

src/platform/update_engine/utils.h

 // Copyright (c) 2009 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.
 
 #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 {
 
 // 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);
@@ skipping 48 matching lines @@
 // on success. This may be called with a regular file--it will just unlink it.
 // This WILL cross filesystem boundaries.
 bool RecursiveUnlinkDir(const std::string& path);
 
 // Synchronously mount or unmount a filesystem. Return true on success.
 // Mounts as ext3 with default options.
 bool MountFilesystem(const std::string& device, const std::string& mountpoint,
                      unsigned long flags);
 bool UnmountFilesystem(const std::string& mountpoint);
 
+// Returns the error message, if any, from a GError pointer.
+const char* GetGErrorMessage(const GError* error);
+
 // Log a string in hex to LOG(INFO). Useful for debugging.
 void HexDumpArray(const unsigned char* const arr, const size_t length);
 inline void HexDumpString(const std::string& str) {
   HexDumpArray(reinterpret_cast<const unsigned char*>(str.data()), str.size());
 }
 inline void HexDumpVector(const std::vector<char>& vect) {
   HexDumpArray(reinterpret_cast<const unsigned char*>(&vect[0]), vect.size());
 }
 
 extern const char* const kStatefulPartition;
@@ skipping 169 matching lines @@
     bool _success = (_x);                                                      \
     if (!_success) {                                                           \
       LOG(ERROR) << #_x " failed.";                                            \
       return;                                                                  \
     }                                                                          \
   } while (0)
 
 
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__