| // Copyright (c) 2011 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 "chrome/installer/util/duplicate_tree_detector.h" |
| |
| #include "base/files/file_enumerator.h" |
| #include "base/files/file_util.h" |
| #include "base/logging.h" |
| |
| namespace installer { |
| |
| bool IsIdenticalFileHierarchy(const base::FilePath& src_path, |
| const base::FilePath& dest_path) { |
| base::File::Info src_info; |
| base::File::Info dest_info; |
| |
| bool is_identical = false; |
| if (base::GetFileInfo(src_path, &src_info) && |
| base::GetFileInfo(dest_path, &dest_info)) { |
| // Both paths exist, check the types: |
| if (!src_info.is_directory && !dest_info.is_directory) { |
| // Two files are "identical" if the file sizes are equivalent. |
| is_identical = src_info.size == dest_info.size; |
| #if !defined(OFFICIAL_BUILD) |
| // For developer builds, also check last modification time (to make sure |
| // version dir DLLs are replaced on over-install even if the tested change |
| // doesn't happen to change a given DLL's size). |
| if (is_identical) |
| is_identical = (src_info.last_modified == dest_info.last_modified); |
| #endif |
| } else if (src_info.is_directory && dest_info.is_directory) { |
| // Two directories are "identical" if dest_path contains entries that are |
| // "identical" to all the entries in src_path. |
| is_identical = true; |
| |
| base::FileEnumerator path_enum(src_path, false /* not recursive */, |
| base::FileEnumerator::FILES | base::FileEnumerator::DIRECTORIES); |
| for (base::FilePath path = path_enum.Next(); |
| is_identical && !path.empty(); |
| path = path_enum.Next()) { |
| is_identical = |
| IsIdenticalFileHierarchy(path, dest_path.Append(path.BaseName())); |
| } |
| } else { |
| // The two paths are of different types, so they cannot be identical. |
| DCHECK(!is_identical); |
| } |
| } |
| |
| return is_identical; |
| } |
| |
| } // namespace installer |