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/*
* Copyright (C) 2019 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.
*/
#pragma once
#include <string>
#include <string_view>
#include <vector>
// This class serves as the base to updater runtime. It wraps the runtime dependent functions; and
// updates on device and host simulations can have different implementations. e.g. block devices
// during host simulation merely a temporary file. With this class, the caller side in registered
// updater's functions will stay the same for both update and simulation.
class UpdaterRuntimeInterface {
public:
virtual ~UpdaterRuntimeInterface() = default;
// Returns true if it's a runtime instance for simulation.
virtual bool IsSimulator() const = 0;
// Returns the value of system property |key|. If the property doesn't exist, returns
// |default_value|.
virtual std::string GetProperty(const std::string_view key,
const std::string_view default_value) const = 0;
// Given the name of the block device, returns |name| for updates on the device; or the file path
// to the fake block device for simulations.
virtual std::string FindBlockDeviceName(const std::string_view name) const = 0;
// Mounts the |location| on |mount_point|. Returns 0 on success.
virtual int Mount(const std::string_view location, const std::string_view mount_point,
const std::string_view fs_type, const std::string_view mount_options) = 0;
// Returns true if |mount_point| is mounted.
virtual bool IsMounted(const std::string_view mount_point) const = 0;
// Unmounts the |mount_point|. Returns a pair of results with the first value indicating
// if the |mount_point| is mounted, and the second value indicating the result of umount(2).
virtual std::pair<bool, int> Unmount(const std::string_view mount_point) = 0;
// Reads |filename| and puts its value to |content|.
virtual bool ReadFileToString(const std::string_view filename, std::string* content) const = 0;
// Updates the content of |filename| with |content|.
virtual bool WriteStringToFile(const std::string_view content,
const std::string_view filename) const = 0;
// Wipes the first |len| bytes of block device in |filename|.
virtual int WipeBlockDevice(const std::string_view filename, size_t len) const = 0;
// Starts a child process and runs the program with |args|. Uses vfork(2) if |is_vfork| is true.
virtual int RunProgram(const std::vector<std::string>& args, bool is_vfork) const = 0;
// Runs tune2fs with arguments |args|.
virtual int Tune2Fs(const std::vector<std::string>& args) const = 0;
// Dynamic partition related functions.
virtual bool MapPartitionOnDeviceMapper(const std::string& partition_name, std::string* path) = 0;
virtual bool UnmapPartitionOnDeviceMapper(const std::string& partition_name) = 0;
virtual bool UpdateDynamicPartitions(const std::string_view op_list_value) = 0;
};
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