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/*
* Copyright (C) 2017 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 <map>
#include <string>
#include <vector>
#include "otautil/rangeset.h"
// The update verifier performs verification upon the first boot to a new slot on A/B devices.
// During the verification, it reads all the blocks in the care_map. And if a failure happens,
// it rejects the current boot and triggers a fallback.
// Note that update_verifier should be backward compatible to not reject care_map.txt from old
// releases, which could otherwise fail to boot into the new release. For example, we've changed
// the care_map format between N and O. An O update_verifier would fail to work with N care_map.txt.
// This could be a result of sideloading an O OTA while the device having a pending N update.
int update_verifier(int argc, char** argv);
// The UpdateVerifier parses the content in the care map, and continues to verify the
// partitions by reading the cared blocks if there's no format error in the file. Otherwise,
// it should skip the verification to avoid bricking the device.
class UpdateVerifier {
public:
// This function tries to process the care_map.pb as protobuf message; and falls back to use
// care_map.txt if the pb format file doesn't exist. If the parsing succeeds, put the result of
// the pair <partition_name, ranges> into the |partition_map_|.
bool ParseCareMap(const std::string& file_name = "");
// Verifies the new boot by reading all the cared blocks for partitions in |partition_map_|.
bool VerifyPartitions();
private:
// Parses the legacy care_map.txt in plain text format.
bool ParseCareMapPlainText(const std::string& content);
// Finds all the dm-enabled partitions, and returns a map of <partition_name, block_device>.
std::map<std::string, std::string> FindDmPartitions();
// Returns true if we successfully read the blocks in |ranges| of the |dm_block_device|.
bool ReadBlocks(const std::string partition_name, const std::string& dm_block_device,
const RangeSet& ranges);
std::map<std::string, RangeSet> partition_map_;
};
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