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// Copyright 2010 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/win/registry.h"
#include "base/win/shlwapi.h"
#include "chrome/installer/util/create_reg_key_work_item.h"
using base::win::RegKey;
namespace {
// TODO: refactor this because it is only used once.
void UpOneDirectoryOrEmpty(std::wstring* dir) {
base::FilePath path = base::FilePath(*dir);
base::FilePath directory = path.DirName();
// If there is no separator, we will get back kCurrentDirectory.
// In this case, clear dir.
if (directory == path ||
directory.value() == base::FilePath::kCurrentDirectory)
dir->clear();
else
*dir = directory.value();
}
} // namespace
CreateRegKeyWorkItem::~CreateRegKeyWorkItem() = default;
CreateRegKeyWorkItem::CreateRegKeyWorkItem(HKEY predefined_root,
const std::wstring& path,
REGSAM wow64_access)
: predefined_root_(predefined_root),
path_(path),
wow64_access_(wow64_access),
key_created_(false) {
DCHECK(wow64_access == 0 || wow64_access == KEY_WOW64_32KEY ||
wow64_access == KEY_WOW64_64KEY);
}
bool CreateRegKeyWorkItem::DoImpl() {
if (!InitKeyList()) {
// Nothing needs to be done here.
VLOG(1) << "no key to create";
return true;
}
RegKey key;
std::wstring key_path;
// To create keys, we iterate from back to front.
for (size_t i = key_list_.size(); i > 0; i--) {
DWORD disposition;
key_path.assign(key_list_[i - 1]);
if (key.CreateWithDisposition(predefined_root_, key_path.c_str(),
&disposition,
KEY_READ | wow64_access_) == ERROR_SUCCESS) {
if (disposition == REG_OPENED_EXISTING_KEY) {
if (key_created_) {
// This should not happen. Someone created a subkey under the key
// we just created?
LOG(ERROR) << key_path << " exists, this is not expected.";
return false;
}
// Remove the key path from list if it is already present.
key_list_.pop_back();
} else if (disposition == REG_CREATED_NEW_KEY) {
VLOG(1) << "created " << key_path;
key_created_ = true;
} else {
LOG(ERROR) << "unkown disposition";
return false;
}
} else {
LOG(ERROR) << "Failed to create " << key_path;
return false;
}
}
return true;
}
void CreateRegKeyWorkItem::RollbackImpl() {
if (!key_created_)
return;
// To delete keys, we iterate from front to back.
for (const auto& key_path : key_list_) {
RegKey key(predefined_root_, key_path.c_str(),
KEY_QUERY_VALUE | wow64_access_);
if (key.GetValueCount().value_or(1) == 0 &&
key.DeleteKey(L"", base::win::RegKey::RecursiveDelete(false)) ==
ERROR_SUCCESS) {
VLOG(1) << "rollback: delete " << key_path;
} else {
VLOG(1) << "rollback: can not delete " << key_path;
// The key might have been deleted, but we don't reliably know what
// error code(s) are returned in this case. So we just keep tring delete
// the rest.
}
}
key_created_ = false;
key_list_.clear();
return;
}
bool CreateRegKeyWorkItem::InitKeyList() {
if (path_.empty())
return false;
std::wstring key_path(path_);
do {
key_list_.push_back(key_path);
// This is pure string operation so it does not matter whether the
// path is file path or registry path.
UpOneDirectoryOrEmpty(&key_path);
} while (!key_path.empty());
return true;
}
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