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// 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/copy_reg_key_work_item.h"
#include <shlwapi.h>
#include "base/logging.h"
#include "base/win/registry.h"
using base::win::RegKey;
CopyRegKeyWorkItem::~CopyRegKeyWorkItem() {
}
CopyRegKeyWorkItem::CopyRegKeyWorkItem(HKEY predefined_root,
const std::wstring& source_key_path,
const std::wstring& dest_key_path)
: predefined_root_(predefined_root),
source_key_path_(source_key_path),
dest_key_path_(dest_key_path) {
DCHECK(predefined_root);
// It's a safe bet that we don't want to copy or overwrite one of the root
// trees.
DCHECK(!source_key_path.empty());
DCHECK(!dest_key_path.empty());
}
bool CopyRegKeyWorkItem::Do() {
if (source_key_path_.empty() || dest_key_path_.empty())
return false;
RegistryKeyBackup backup;
RegKey dest_key;
// Only try to make a backup if we're not configured to ignore failures.
if (!ignore_failure_) {
if (!backup.Initialize(predefined_root_, dest_key_path_.c_str())) {
LOG(ERROR) << "Failed to backup destination for registry key copy.";
return false;
}
}
// Delete the destination before attempting to copy.
LONG result = SHDeleteKey(predefined_root_, dest_key_path_.c_str());
if (result != ERROR_SUCCESS && result != ERROR_FILE_NOT_FOUND) {
LOG(ERROR) << "Failed to delete key at " << dest_key_path_ << ", result: "
<< result;
} else {
// We've just modified the registry, so remember any backup we may have
// made so that Rollback can take us back where we started.
backup_.swap(backup);
// Make the copy.
result = dest_key.Create(predefined_root_, dest_key_path_.c_str(),
KEY_WRITE);
if (result != ERROR_SUCCESS) {
LOG(ERROR) << "Failed to open destination key at " << dest_key_path_
<< ", result: " << result;
} else {
result = SHCopyKey(predefined_root_, source_key_path_.c_str(),
dest_key.Handle(), 0);
switch (result) {
case ERROR_FILE_NOT_FOUND:
// The source didn't exist, so neither should the destination.
dest_key.Close();
SHDeleteKey(predefined_root_, dest_key_path_.c_str());
// Handle like a success.
result = ERROR_SUCCESS;
// -- FALL THROUGH TO SUCCESS CASE --
case ERROR_SUCCESS:
break;
default:
LOG(ERROR) << "Failed to copy key from " << source_key_path_ << " to "
<< dest_key_path_ << ", result: " << result;
break;
}
}
}
return ignore_failure_ ? true : (result == ERROR_SUCCESS);
}
void CopyRegKeyWorkItem::Rollback() {
if (ignore_failure_)
return;
// Delete anything in the key before restoring the backup in case someone else
// put new data in the key after Do().
LONG result = SHDeleteKey(predefined_root_, dest_key_path_.c_str());
if (result != ERROR_SUCCESS && result != ERROR_FILE_NOT_FOUND) {
LOG(ERROR) << "Failed to delete key at " << dest_key_path_
<< " in rollback, result: " << result;
}
// Restore the old contents. The restoration takes on its default security
// attributes; any custom attributes are lost.
if (!backup_.WriteTo(predefined_root_, dest_key_path_.c_str()))
LOG(ERROR) << "Failed to restore key in rollback.";
}
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