create_reg_key_work_item.cc revision 4e180b6a0b4720a9b8e9e959a882386f690f08ff 
1// Copyright (c) 2010 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#include <shlwapi.h>
6
7#include "base/files/file_path.h"
8#include "base/logging.h"
9#include "base/win/registry.h"
10#include "chrome/installer/util/create_reg_key_work_item.h"
11#include "chrome/installer/util/install_util.h"
12#include "chrome/installer/util/logging_installer.h"
13
14using base::win::RegKey;
15
16namespace {
17
18// TODO: refactor this because it is only used once.
19void UpOneDirectoryOrEmpty(std::wstring* dir) {
20  base::FilePath path = base::FilePath(*dir);
21  base::FilePath directory = path.DirName();
22  // If there is no separator, we will get back kCurrentDirectory.
23  // In this case, clear dir.
24  if (directory == path || directory.value() ==
25      base::FilePath::kCurrentDirectory)
26    dir->clear();
27  else
28    *dir = directory.value();
29}
30
31}  // namespace
32
33CreateRegKeyWorkItem::~CreateRegKeyWorkItem() {
34}
35
36CreateRegKeyWorkItem::CreateRegKeyWorkItem(HKEY predefined_root,
37                                           const std::wstring& path)
38    : predefined_root_(predefined_root),
39      path_(path),
40      key_created_(false) {
41}
42
43bool CreateRegKeyWorkItem::Do() {
44  if (!InitKeyList()) {
45    // Nothing needs to be done here.
46    VLOG(1) << "no key to create";
47    return true;
48  }
49
50  RegKey key;
51  std::wstring key_path;
52
53  // To create keys, we iterate from back to front.
54  for (size_t i = key_list_.size(); i > 0; i--) {
55    DWORD disposition;
56    key_path.assign(key_list_[i - 1]);
57
58    if (key.CreateWithDisposition(predefined_root_, key_path.c_str(),
59                                  &disposition, KEY_READ) == ERROR_SUCCESS) {
60      if (disposition == REG_OPENED_EXISTING_KEY) {
61        if (key_created_) {
62          // This should not happen. Someone created a subkey under the key
63          // we just created?
64          LOG(ERROR) << key_path << " exists, this is not expected.";
65          return false;
66        }
67        // Remove the key path from list if it is already present.
68        key_list_.pop_back();
69      } else if (disposition == REG_CREATED_NEW_KEY) {
70        VLOG(1) << "created " << key_path;
71        key_created_ = true;
72      } else {
73        LOG(ERROR) << "unkown disposition";
74        return false;
75      }
76    } else {
77      LOG(ERROR) << "Failed to create " << key_path;
78      return false;
79    }
80  }
81
82  return true;
83}
84
85void CreateRegKeyWorkItem::Rollback() {
86  if (!key_created_)
87    return;
88
89  std::wstring key_path;
90  // To delete keys, we iterate from front to back.
91  std::vector<std::wstring>::iterator itr;
92  for (itr = key_list_.begin(); itr != key_list_.end(); ++itr) {
93    key_path.assign(*itr);
94    if (SHDeleteEmptyKey(predefined_root_, key_path.c_str()) ==
95        ERROR_SUCCESS) {
96      VLOG(1) << "rollback: delete " << key_path;
97    } else {
98      VLOG(1) << "rollback: can not delete " << key_path;
99      // The key might have been deleted, but we don't reliably know what
100      // error code(s) are returned in this case. So we just keep tring delete
101      // the rest.
102    }
103  }
104
105  key_created_ = false;
106  key_list_.clear();
107  return;
108}
109
110bool CreateRegKeyWorkItem::InitKeyList() {
111  if (path_.empty())
112    return false;
113
114  std::wstring key_path(path_);
115
116  do {
117    key_list_.push_back(key_path);
118    // This is pure string operation so it does not matter whether the
119    // path is file path or registry path.
120    UpOneDirectoryOrEmpty(&key_path);
121  } while (!key_path.empty());
122
123  return true;
124}
125