AU: Timestamp logs at startup.

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>
@@ skipping 42 matching lines @@
 std::string ErrnoNumberAsString(int err);
 
 // Strips duplicate slashes, and optionally removes all trailing slashes.
 // Does not compact /./ or /../.
 std::string NormalizePath(const std::string& path, bool strip_trailing_slash);
 
 // Returns true if the file exists for sure. Returns false if it doesn't exist,
 // or an error occurs.
 bool FileExists(const char* path);
 
+// Returns true if |path| exists and is a symbolic link.
+bool IsSymlink(const char* path);
+
 // The last 6 chars of path must be XXXXXX. They will be randomly changed
 // and a non-existent path will be returned. Intentionally makes a copy
 // of the string passed in.
 // NEVER CALL THIS FUNCTION UNLESS YOU ARE SURE
 // THAT YOUR PROCESS WILL BE THE ONLY THING WRITING FILES IN THIS DIRECTORY.
 std::string TempFilename(std::string path);
 
 // Calls mkstemp() with the template passed. Returns the filename in the
 // out param filename. If fd is non-NULL, the file fd returned by mkstemp
 // is not close()d and is returned in the out param 'fd'. However, if
@@ skipping 309 matching lines @@
     bool _success = (_x);                                                      \
     if (!_success) {                                                           \
       LOG(ERROR) << #_x " failed.";                                            \
       return;                                                                  \
     }                                                                          \
   } while (0)
 
 
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__