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//
// Copyright (C) 2021 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.
//
#include <stdio.h>
#include <string.h>
#include <cstdint>
#include <cstdio>
#include <memory>
#include <sys/fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <base/files/file_path.h>
#include <libsnapshot/cow_writer.h>
#include "update_engine/common/cow_operation_convert.h"
#include "update_engine/common/utils.h"
#include "update_engine/payload_consumer/file_descriptor.h"
#include "update_engine/payload_consumer/payload_metadata.h"
#include "update_engine/payload_generator/cow_size_estimator.h"
#include "update_engine/update_metadata.pb.h"
using android::snapshot::CowWriter;
namespace chromeos_update_engine {
bool ProcessPartition(const chromeos_update_engine::PartitionUpdate& partition,
const char* image_dir,
size_t block_size) {
base::FilePath img_dir{image_dir};
auto target_img = img_dir.Append(partition.partition_name() + ".img");
auto output_cow = img_dir.Append(partition.partition_name() + ".cow");
FileDescriptorPtr target_img_fd = std::make_shared<EintrSafeFileDescriptor>();
if (!target_img_fd->Open(target_img.value().c_str(), O_RDONLY)) {
PLOG(ERROR) << "Failed to open " << target_img.value();
return false;
}
android::base::unique_fd output_fd{
open(output_cow.value().c_str(), O_RDWR | O_CREAT, 0744)};
if (output_fd < 0) {
PLOG(ERROR) << "Failed to open " << output_cow.value();
return false;
}
android::snapshot::CowWriter cow_writer{
{.block_size = static_cast<uint32_t>(block_size), .compression = "gz"}};
TEST_AND_RETURN_FALSE(cow_writer.Initialize(output_fd));
TEST_AND_RETURN_FALSE(CowDryRun(target_img_fd,
partition.operations(),
partition.merge_operations(),
block_size,
&cow_writer));
TEST_AND_RETURN_FALSE(cow_writer.Finalize());
return true;
}
} // namespace chromeos_update_engine
using chromeos_update_engine::MetadataParseResult;
using chromeos_update_engine::PayloadMetadata;
int main(int argc, const char* argv[]) {
if (argc != 3) {
printf("Usage: %s <payload.bin> <extracted target_file>\n", argv[0]);
return -1;
}
const char* payload_path = argv[1];
const char* images_dir = argv[2];
int payload_fd = open(payload_path, O_RDONLY);
if (payload_fd < 0) {
PLOG(ERROR) << "Failed to open payload file:";
return 1;
}
chromeos_update_engine::ScopedFdCloser closer{&payload_fd};
auto payload_size = chromeos_update_engine::utils::FileSize(payload_fd);
if (payload_size <= 0) {
PLOG(ERROR)
<< "Couldn't determine size of payload file, or payload file is empty";
return 2;
}
PayloadMetadata payload_metadata;
auto payload = static_cast<unsigned char*>(
mmap(nullptr, payload_size, PROT_READ, MAP_PRIVATE, payload_fd, 0));
// C++ dark magic to ensure that |payload| is properly deallocated once the
// program exits.
auto munmap_deleter = [payload_size](auto payload) {
munmap(payload, payload_size);
};
std::unique_ptr<unsigned char, decltype(munmap_deleter)> munmapper{
payload, munmap_deleter};
if (payload == nullptr) {
PLOG(ERROR) << "Failed to mmap() payload file";
return 3;
}
if (payload_metadata.ParsePayloadHeader(payload, payload_size, nullptr) !=
chromeos_update_engine::MetadataParseResult::kSuccess) {
LOG(ERROR) << "Payload header parse failed!";
return 4;
}
chromeos_update_engine::DeltaArchiveManifest manifest;
if (!payload_metadata.GetManifest(payload, payload_size, &manifest)) {
LOG(ERROR) << "Failed to parse manifest!";
return 5;
}
for (const auto& partition : manifest.partitions()) {
LOG(INFO) << partition.partition_name();
if (!ProcessPartition(partition, images_dir, manifest.block_size())) {
return 6;
}
}
return 0;
}
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