1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 //
5
6 #include "chrome/installer/util/duplicate_tree_detector.h"
7
8 #include "base/check.h"
9 #include "base/files/file_enumerator.h"
10 #include "base/files/file_util.h"
11
12 namespace installer {
13
IsIdenticalFileHierarchy(const base::FilePath & src_path,const base::FilePath & dest_path)14 bool IsIdenticalFileHierarchy(const base::FilePath& src_path,
15 const base::FilePath& dest_path) {
16 base::File::Info src_info;
17 base::File::Info dest_info;
18
19 bool is_identical = false;
20 if (base::GetFileInfo(src_path, &src_info) &&
21 base::GetFileInfo(dest_path, &dest_info)) {
22 // Both paths exist, check the types:
23 if (!src_info.is_directory && !dest_info.is_directory) {
24 // Two files are "identical" if the file sizes are equivalent.
25 is_identical = src_info.size == dest_info.size;
26 #if !defined(OFFICIAL_BUILD)
27 // For developer builds, also check last modification time (to make sure
28 // version dir DLLs are replaced on over-install even if the tested change
29 // doesn't happen to change a given DLL's size).
30 if (is_identical)
31 is_identical = (src_info.last_modified == dest_info.last_modified);
32 #endif
33 } else if (src_info.is_directory && dest_info.is_directory) {
34 // Two directories are "identical" if dest_path contains entries that are
35 // "identical" to all the entries in src_path.
36 is_identical = true;
37
38 base::FileEnumerator path_enum(
39 src_path, false /* not recursive */,
40 base::FileEnumerator::FILES | base::FileEnumerator::DIRECTORIES);
41 for (base::FilePath path = path_enum.Next();
42 is_identical && !path.empty(); path = path_enum.Next()) {
43 is_identical =
44 IsIdenticalFileHierarchy(path, dest_path.Append(path.BaseName()));
45 }
46 } else {
47 // The two paths are of different types, so they cannot be identical.
48 DCHECK(!is_identical);
49 }
50 }
51
52 return is_identical;
53 }
54
55 } // namespace installer
56