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// Copyright (c) 2010 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/set_reg_value_work_item.h"
#include "base/logging.h"
#include "base/registry.h"
#include "chrome/installer/util/logging_installer.h"
SetRegValueWorkItem::~SetRegValueWorkItem() {
}
SetRegValueWorkItem::SetRegValueWorkItem(HKEY predefined_root,
const std::wstring& key_path,
const std::wstring& value_name,
const std::wstring& value_data,
bool overwrite)
: predefined_root_(predefined_root),
key_path_(key_path),
value_name_(value_name),
value_data_str_(value_data),
value_data_dword_(0),
overwrite_(overwrite),
status_(SET_VALUE),
is_str_type_(true),
previous_value_dword_(0) {
}
SetRegValueWorkItem::SetRegValueWorkItem(HKEY predefined_root,
const std::wstring& key_path,
const std::wstring& value_name,
DWORD value_data,
bool overwrite)
: predefined_root_(predefined_root),
key_path_(key_path),
value_name_(value_name),
value_data_dword_(value_data),
overwrite_(overwrite),
status_(SET_VALUE),
is_str_type_(false),
previous_value_dword_(0) {
}
bool SetRegValueWorkItem::Do() {
if (status_ != SET_VALUE) {
// we already did something.
LOG(ERROR) << "multiple calls to Do()";
return false;
}
RegKey key;
if (!key.Open(predefined_root_, key_path_.c_str(),
KEY_READ | KEY_SET_VALUE)) {
LOG(ERROR) << "can not open " << key_path_;
status_ = VALUE_UNCHANGED;
return false;
}
bool result = false;
if (key.ValueExists(value_name_.c_str())) {
if (overwrite_) {
bool success = true;
// Read previous value for rollback and write new value
if (is_str_type_) {
std::wstring data;
if (key.ReadValue(value_name_.c_str(), &data)) {
previous_value_str_.assign(data);
}
success = key.WriteValue(value_name_.c_str(), value_data_str_.c_str());
} else {
DWORD data;
if (key.ReadValueDW(value_name_.c_str(), &data)) {
previous_value_dword_ = data;
}
success = key.WriteValue(value_name_.c_str(), value_data_dword_);
}
if (success) {
LOG(INFO) << "overwritten value for " << value_name_;
status_ = VALUE_OVERWRITTEN;
result = true;
} else {
LOG(ERROR) << "failed to overwrite value for " << value_name_;
status_ = VALUE_UNCHANGED;
result = false;
}
} else {
LOG(INFO) << value_name_ << " exists. not changed ";
status_ = VALUE_UNCHANGED;
result = true;
}
} else {
bool success = true;
if (is_str_type_) {
success = key.WriteValue(value_name_.c_str(), value_data_str_.c_str());
} else {
success = key.WriteValue(value_name_.c_str(), value_data_dword_);
}
if (success) {
LOG(INFO) << "created value for " << value_name_;
status_ = NEW_VALUE_CREATED;
result = true;
} else {
LOG(ERROR) << "failed to create value for " << value_name_;
status_ = VALUE_UNCHANGED;
result = false;
}
}
key.Close();
return result;
}
void SetRegValueWorkItem::Rollback() {
if (status_ == SET_VALUE || status_ == VALUE_ROLL_BACK)
return;
if (status_ == VALUE_UNCHANGED) {
status_ = VALUE_ROLL_BACK;
LOG(INFO) << "rollback: setting unchanged, nothing to do";
return;
}
RegKey key;
if (!key.Open(predefined_root_, key_path_.c_str(),
KEY_READ | KEY_SET_VALUE)) {
status_ = VALUE_ROLL_BACK;
LOG(INFO) << "rollback: can not open " << key_path_;
return;
}
std::wstring result_str(L" failed");
if (status_ == NEW_VALUE_CREATED) {
if (key.DeleteValue(value_name_.c_str()))
result_str.assign(L" succeeded");
LOG(INFO) << "rollback: deleting " << value_name_ << result_str;
} else if (status_ == VALUE_OVERWRITTEN) {
// try restore the previous value
bool success = true;
if (is_str_type_) {
success = key.WriteValue(value_name_.c_str(),
previous_value_str_.c_str());
} else {
success = key.WriteValue(value_name_.c_str(), previous_value_dword_);
}
if (success)
result_str.assign(L" succeeded");
LOG(INFO) << "rollback: restoring " << value_name_ << result_str;
} else {
// Not reached.
}
status_ = VALUE_ROLL_BACK;
key.Close();
return;
}
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