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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.
// Registry utility functions used only by tests.
#include <memory>
#include <vector>
#include "base/macros.h"
#include "base/strings/string16.h"
#include "base/time/time.h"
#include "base/win/registry.h"
namespace registry_util {
// Allows a test to easily override registry hives so that it can start from a
// known good state, or make sure to not leave any side effects once the test
// completes. This supports parallel tests. All the overrides are scoped to the
// lifetime of the override manager. Destroy the manager to undo the overrides.
// Overridden hives use keys stored at, for instance:
// HKCU\Software\Chromium\TempTestKeys\
// 13028145911617809$02AB211C-CF73-478D-8D91-618E11998AED
// The key path are comprises of:
// - The test key root, HKCU\Software\Chromium\TempTestKeys\
// - The base::Time::ToInternalValue of the creation time. This is used to
// delete stale keys left over from crashed tests.
// - A GUID used for preventing name collisions (although unlikely) between
// two RegistryOverrideManagers created with the same timestamp.
class RegistryOverrideManager {
// Override the given registry hive using a randomly generated temporary key.
// Multiple overrides to the same hive are not supported and lead to undefined
// behavior.
// Optional return of the registry override path.
// Calls to these functions must be wrapped in ASSERT_NO_FATAL_FAILURE to
// ensure that tests do not proceeed in case of failure to override.
void OverrideRegistry(HKEY override);
void OverrideRegistry(HKEY override, base::string16* override_path);
friend class RegistryOverrideManagerTest;
// Keeps track of one override.
class ScopedRegistryKeyOverride {
ScopedRegistryKeyOverride(HKEY override, const base::string16& key_path);
HKEY override_;
base::string16 key_path_;
// Used for testing only.
RegistryOverrideManager(const base::Time& timestamp,
const base::string16& test_key_root);
base::Time timestamp_;
base::string16 guid_;
base::string16 test_key_root_;
std::vector<std::unique_ptr<ScopedRegistryKeyOverride>> overrides_;
// Generates a temporary key path that will be eventually deleted
// automatically if the process crashes.
base::string16 GenerateTempKeyPath();
} // namespace registry_util