1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
/*
* 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 <functional>
#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:
UpdateVerifier();
// 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();
// Verifies the new boot by reading all the cared blocks for partitions in |partition_map_|.
bool VerifyPartitions();
private:
friend class UpdateVerifierTest;
// 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);
// Functions to override the care_map_prefix_ and property_reader_, used in test only.
void set_care_map_prefix(const std::string& prefix);
void set_property_reader(const std::function<std::string(const std::string&)>& property_reader);
std::map<std::string, RangeSet> partition_map_;
// The path to the care_map excluding the filename extension; default value:
// "/data/ota_package/care_map"
std::string care_map_prefix_;
// The function to read the device property; default value: android::base::GetProperty()
std::function<std::string(const std::string&)> property_reader_;
};
|
