xunchang
aab4b829f4
We have already switched to the protobuf format for new builds, and
the downgrade packages will require a data wipe. So it should be safe
to drop the support for text format.
This also helps to save the issue when users sideload a package with a
pending OTA, because the new CareMap contains the fingerprint of the
intended build.
Bug: 128536706
Test: unit tests pass, run update_verifier with legacy CareMap
Change-Id: I1c4d0e54ec591f16cc0a65dac76767725ff9e7c4
(cherry picked from commit aaa6103ae7)
72 lines
3.1 KiB
C++
72 lines
3.1 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <functional>
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#include <map>
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#include <string>
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#include <vector>
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#include "otautil/rangeset.h"
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// The update verifier performs verification upon the first boot to a new slot on A/B devices.
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// During the verification, it reads all the blocks in the care_map. And if a failure happens,
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// it rejects the current boot and triggers a fallback.
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// Note that update_verifier should be backward compatible to not reject care_map.txt from old
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// releases, which could otherwise fail to boot into the new release. For example, we've changed
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// the care_map format between N and O. An O update_verifier would fail to work with N care_map.txt.
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// This could be a result of sideloading an O OTA while the device having a pending N update.
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int update_verifier(int argc, char** argv);
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// The UpdateVerifier parses the content in the care map, and continues to verify the
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// partitions by reading the cared blocks if there's no format error in the file. Otherwise,
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// it should skip the verification to avoid bricking the device.
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class UpdateVerifier {
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public:
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UpdateVerifier();
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// This function tries to process the care_map.pb as protobuf message; and falls back to use
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// care_map.txt if the pb format file doesn't exist. If the parsing succeeds, put the result
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// of the pair <partition_name, ranges> into the |partition_map_|.
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bool ParseCareMap();
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// Verifies the new boot by reading all the cared blocks for partitions in |partition_map_|.
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bool VerifyPartitions();
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private:
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friend class UpdateVerifierTest;
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// Finds all the dm-enabled partitions, and returns a map of <partition_name, block_device>.
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std::map<std::string, std::string> FindDmPartitions();
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// Returns true if we successfully read the blocks in |ranges| of the |dm_block_device|.
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bool ReadBlocks(const std::string partition_name, const std::string& dm_block_device,
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const RangeSet& ranges);
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// Functions to override the care_map_prefix_ and property_reader_, used in test only.
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void set_care_map_prefix(const std::string& prefix);
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void set_property_reader(const std::function<std::string(const std::string&)>& property_reader);
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std::map<std::string, RangeSet> partition_map_;
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// The path to the care_map excluding the filename extension; default value:
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// "/data/ota_package/care_map"
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std::string care_map_prefix_;
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// The function to read the device property; default value: android::base::GetProperty()
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std::function<std::string(const std::string&)> property_reader_;
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};
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