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//
// Copyright (C) 2015 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef UPDATE_ENGINE_CROS_BOOT_CONTROL_CHROMEOS_H_
#define UPDATE_ENGINE_CROS_BOOT_CONTROL_CHROMEOS_H_
#include <memory>
#include <string>
#include <base/callback.h>
#include <gtest/gtest_prod.h> // for FRIEND_TEST
#include "update_engine/common/boot_control_interface.h"
#include "update_engine/common/dynamic_partition_control_interface.h"
namespace chromeos_update_engine {
// The Chrome OS implementation of the BootControlInterface. This interface
// assumes the partition names and numbers used in Chrome OS devices.
class BootControlChromeOS : public BootControlInterface {
public:
BootControlChromeOS() = default;
~BootControlChromeOS() = default;
// Initialize the BootControl instance loading the constant values. Returns
// whether the operation succeeded. In case of failure, normally meaning
// some critical failure such as we couldn't determine the slot that we
// booted from, the implementation will pretend that there's only one slot and
// therefore A/B updates are disabled.
bool Init();
// BootControlInterface overrides.
unsigned int GetNumSlots() const override;
BootControlInterface::Slot GetCurrentSlot() const override;
bool GetPartitionDevice(const std::string& partition_name,
BootControlInterface::Slot slot,
bool not_in_payload,
std::string* device,
bool* is_dynamic) const override;
bool GetPartitionDevice(const std::string& partition_name,
BootControlInterface::Slot slot,
std::string* device) const override;
bool IsSlotBootable(BootControlInterface::Slot slot) const override;
bool MarkSlotUnbootable(BootControlInterface::Slot slot) override;
bool SetActiveBootSlot(BootControlInterface::Slot slot) override;
bool MarkBootSuccessfulAsync(base::Callback<void(bool)> callback) override;
bool IsSlotMarkedSuccessful(BootControlInterface::Slot slot) const override;
DynamicPartitionControlInterface* GetDynamicPartitionControl() override;
private:
friend class BootControlChromeOSTest;
FRIEND_TEST(BootControlChromeOSTest, SysfsBlockDeviceTest);
FRIEND_TEST(BootControlChromeOSTest, GetPartitionNumberTest);
FRIEND_TEST(BootControlChromeOSTest, ParseDlcPartitionNameTest);
// Returns the sysfs block device for a root block device. For example,
// SysfsBlockDevice("/dev/sda") returns "/sys/block/sda". Returns an empty
// string if the input device is not of the "/dev/xyz" form.
static std::string SysfsBlockDevice(const std::string& device);
// Returns true if the root |device| (e.g., "/dev/sdb") is known to be
// removable, false otherwise.
static bool IsRemovableDevice(const std::string& device);
// Return the hard-coded partition number used in Chrome OS for the passed
// |partition_name| and |slot|. In case of invalid data, returns -1.
int GetPartitionNumber(const std::string partition_name,
BootControlInterface::Slot slot) const;
// Extracts DLC module ID and package ID from partition name. The structure of
// the partition name is dlc/<dlc-id>/<dlc-package>. For example:
// dlc/fake-dlc/fake-package
bool ParseDlcPartitionName(const std::string partition_name,
std::string* dlc_id,
std::string* dlc_package) const;
// Cached values for GetNumSlots() and GetCurrentSlot().
BootControlInterface::Slot num_slots_{1};
BootControlInterface::Slot current_slot_{BootControlInterface::kInvalidSlot};
// The block device of the disk we booted from, without the partition number.
std::string boot_disk_name_;
std::unique_ptr<DynamicPartitionControlInterface> dynamic_partition_control_;
DISALLOW_COPY_AND_ASSIGN(BootControlChromeOS);
};
} // namespace chromeos_update_engine
#endif // UPDATE_ENGINE_CROS_BOOT_CONTROL_CHROMEOS_H_
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