//
// Copyright (C) 2010 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 <string>
#include <vector>
#include <base/files/file_path.h>
#include <base/files/file_util.h>
#include <base/logging.h>
#include <base/strings/string_number_conversions.h>
#include <base/strings/string_split.h>
#include <brillo/flag_helper.h>
#include <brillo/key_value_store.h>
#include <brillo/message_loops/base_message_loop.h>
#include <xz.h>
#include "update_engine/common/fake_boot_control.h"
#include "update_engine/common/fake_hardware.h"
#include "update_engine/common/file_fetcher.h"
#include "update_engine/common/prefs.h"
#include "update_engine/common/terminator.h"
#include "update_engine/common/utils.h"
#include "update_engine/payload_consumer/download_action.h"
#include "update_engine/payload_consumer/filesystem_verifier_action.h"
#include "update_engine/payload_consumer/payload_constants.h"
#include "update_engine/payload_generator/delta_diff_generator.h"
#include "update_engine/payload_generator/payload_generation_config.h"
#include "update_engine/payload_generator/payload_signer.h"
#include "update_engine/payload_generator/xz.h"
#include "update_engine/update_metadata.pb.h"
// This file contains a simple program that takes an old path, a new path,
// and an output file as arguments and the path to an output file and
// generates a delta that can be sent to Chrome OS clients.
using std::string;
using std::vector;
namespace chromeos_update_engine {
namespace {
void ParseSignatureSizes(const string& signature_sizes_flag,
vector<int>* signature_sizes) {
signature_sizes->clear();
vector<string> split_strings = base::SplitString(
signature_sizes_flag, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
for (const string& str : split_strings) {
int size = 0;
bool parsing_successful = base::StringToInt(str, &size);
LOG_IF(FATAL, !parsing_successful) << "Invalid signature size: " << str;
LOG_IF(FATAL, size != 256 && size != 512)
<< "Only signature sizes of 256 or 512 bytes are supported.";
signature_sizes->push_back(size);
}
}
bool ParseImageInfo(const string& channel,
const string& board,
const string& version,
const string& key,
const string& build_channel,
const string& build_version,
ImageInfo* image_info) {
// All of these arguments should be present or missing.
bool empty = channel.empty();
CHECK_EQ(channel.empty(), empty);
CHECK_EQ(board.empty(), empty);
CHECK_EQ(version.empty(), empty);
CHECK_EQ(key.empty(), empty);
if (empty)
return false;
image_info->set_channel(channel);
image_info->set_board(board);
image_info->set_version(version);
image_info->set_key(key);
image_info->set_build_channel(build_channel.empty() ? channel
: build_channel);
image_info->set_build_version(build_version.empty() ? version
: build_version);
return true;
}
void CalculateHashForSigning(const vector<int>& sizes,
const string& out_hash_file,
const string& out_metadata_hash_file,
const string& in_file) {
LOG(INFO) << "Calculating hash for signing.";
LOG_IF(FATAL, in_file.empty())
<< "Must pass --in_file to calculate hash for signing.";
LOG_IF(FATAL, out_hash_file.empty())
<< "Must pass --out_hash_file to calculate hash for signing.";
brillo::Blob payload_hash, metadata_hash;
CHECK(PayloadSigner::HashPayloadForSigning(
in_file, sizes, &payload_hash, &metadata_hash));
CHECK(utils::WriteFile(
out_hash_file.c_str(), payload_hash.data(), payload_hash.size()));
if (!out_metadata_hash_file.empty())
CHECK(utils::WriteFile(out_metadata_hash_file.c_str(),
metadata_hash.data(),
metadata_hash.size()));
LOG(INFO) << "Done calculating hash for signing.";
}
void SignatureFileFlagToBlobs(const string& signature_file_flag,
vector<brillo::Blob>* signatures) {
vector<string> signature_files = base::SplitString(
signature_file_flag, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
for (const string& signature_file : signature_files) {
brillo::Blob signature;
CHECK(utils::ReadFile(signature_file, &signature));
signatures->push_back(signature);
}
}
void SignPayload(const string& in_file,
const string& out_file,
const string& payload_signature_file,
const string& metadata_signature_file,
const string& out_metadata_size_file) {
LOG(INFO) << "Signing payload.";
LOG_IF(FATAL, in_file.empty()) << "Must pass --in_file to sign payload.";
LOG_IF(FATAL, out_file.empty()) << "Must pass --out_file to sign payload.";
LOG_IF(FATAL, payload_signature_file.empty())
<< "Must pass --payload_signature_file to sign payload.";
vector<brillo::Blob> payload_signatures, metadata_signatures;
SignatureFileFlagToBlobs(payload_signature_file, &payload_signatures);
SignatureFileFlagToBlobs(metadata_signature_file, &metadata_signatures);
uint64_t final_metadata_size;
CHECK(PayloadSigner::AddSignatureToPayload(in_file,
payload_signatures,
metadata_signatures,
out_file,
&final_metadata_size));
LOG(INFO) << "Done signing payload. Final metadata size = "
<< final_metadata_size;
if (!out_metadata_size_file.empty()) {
string metadata_size_string = std::to_string(final_metadata_size);
CHECK(utils::WriteFile(out_metadata_size_file.c_str(),
metadata_size_string.data(),
metadata_size_string.size()));
}
}
int VerifySignedPayload(const string& in_file, const string& public_key) {
LOG(INFO) << "Verifying signed payload.";
LOG_IF(FATAL, in_file.empty())
<< "Must pass --in_file to verify signed payload.";
LOG_IF(FATAL, public_key.empty())
<< "Must pass --public_key to verify signed payload.";
if (!PayloadSigner::VerifySignedPayload(in_file, public_key)) {
LOG(INFO) << "VerifySignedPayload failed";
return 1;
}
LOG(INFO) << "Done verifying signed payload.";
return 0;
}
class ApplyPayloadProcessorDelegate : public ActionProcessorDelegate {
public:
void ProcessingDone(const ActionProcessor* processor,
ErrorCode code) override {
brillo::MessageLoop::current()->BreakLoop();
code_ = code;
}
void ProcessingStopped(const ActionProcessor* processor) override {
brillo::MessageLoop::current()->BreakLoop();
}
ErrorCode code_;
};
// TODO(deymo): Move this function to a new file and make the delta_performer
// integration tests use this instead.
bool ApplyPayload(const string& payload_file,
// Simply reuses the payload config used for payload
// generation.
const PayloadGenerationConfig& config) {
LOG(INFO) << "Applying delta.";
FakeBootControl fake_boot_control;
FakeHardware fake_hardware;
MemoryPrefs prefs;
InstallPlan install_plan;
InstallPlan::Payload payload;
install_plan.source_slot =
config.is_delta ? 0 : BootControlInterface::kInvalidSlot;
install_plan.target_slot = 1;
payload.type =
config.is_delta ? InstallPayloadType::kDelta : InstallPayloadType::kFull;
payload.size = utils::FileSize(payload_file);
// TODO(senj): This hash is only correct for unsigned payload, need to support
// signed payload using PayloadSigner.
HashCalculator::RawHashOfFile(payload_file, payload.size, &payload.hash);
install_plan.payloads = {payload};
install_plan.download_url =
"file://" +
base::MakeAbsoluteFilePath(base::FilePath(payload_file)).value();
for (size_t i = 0; i < config.target.partitions.size(); i++) {
const string& part_name = config.target.partitions[i].name;
const string& target_path = config.target.partitions[i].path;
fake_boot_control.SetPartitionDevice(
part_name, install_plan.target_slot, target_path);
string source_path;
if (config.is_delta) {
TEST_AND_RETURN_FALSE(config.target.partitions.size() ==
config.source.partitions.size());
source_path = config.source.partitions[i].path;
fake_boot_control.SetPartitionDevice(
part_name, install_plan.source_slot, source_path);
}
LOG(INFO) << "Install partition:"
<< " source: " << source_path << "\ttarget: " << target_path;
}
xz_crc32_init();
brillo::BaseMessageLoop loop;
loop.SetAsCurrent();
auto install_plan_action = std::make_unique<InstallPlanAction>(install_plan);
auto download_action =
std::make_unique<DownloadAction>(&prefs,
&fake_boot_control,
&fake_hardware,
nullptr,
new FileFetcher(),
true /* interactive */);
auto filesystem_verifier_action =
std::make_unique<FilesystemVerifierAction>();
BondActions(install_plan_action.get(), download_action.get());
BondActions(download_action.get(), filesystem_verifier_action.get());
ActionProcessor processor;
ApplyPayloadProcessorDelegate delegate;
processor.set_delegate(&delegate);
processor.EnqueueAction(std::move(install_plan_action));
processor.EnqueueAction(std::move(download_action));
processor.EnqueueAction(std::move(filesystem_verifier_action));
processor.StartProcessing();
loop.Run();
CHECK_EQ(delegate.code_, ErrorCode::kSuccess);
LOG(INFO) << "Completed applying " << (config.is_delta ? "delta" : "full")
<< " payload.";
return true;
}
int ExtractProperties(const string& payload_path, const string& props_file) {
brillo::KeyValueStore properties;
TEST_AND_RETURN_FALSE(
PayloadSigner::ExtractPayloadProperties(payload_path, &properties));
if (props_file == "-") {
printf("%s", properties.SaveToString().c_str());
} else {
properties.Save(base::FilePath(props_file));
LOG(INFO) << "Generated properties file at " << props_file;
}
return true;
}
int Main(int argc, char** argv) {
DEFINE_string(old_image, "", "Path to the old rootfs");
DEFINE_string(new_image, "", "Path to the new rootfs");
DEFINE_string(old_kernel, "", "Path to the old kernel partition image");
DEFINE_string(new_kernel, "", "Path to the new kernel partition image");
DEFINE_string(old_partitions,
"",
"Path to the old partitions. To pass multiple partitions, use "
"a single argument with a colon between paths, e.g. "
"/path/to/part:/path/to/part2::/path/to/last_part . Path can "
"be empty, but it has to match the order of partition_names.");
DEFINE_string(new_partitions,
"",
"Path to the new partitions. To pass multiple partitions, use "
"a single argument with a colon between paths, e.g. "
"/path/to/part:/path/to/part2:/path/to/last_part . Path has "
"to match the order of partition_names.");
DEFINE_string(old_mapfiles,
"",
"Path to the .map files associated with the partition files "
"in the old partition. The .map file is normally generated "
"when creating the image in Android builds. Only recommended "
"for unsupported filesystem. Pass multiple files separated by "
"a colon as with -old_partitions.");
DEFINE_string(new_mapfiles,
"",
"Path to the .map files associated with the partition files "
"in the new partition, similar to the -old_mapfiles flag.");
DEFINE_string(partition_names,
string(kPartitionNameRoot) + ":" + kPartitionNameKernel,
"Names of the partitions. To pass multiple names, use a single "
"argument with a colon between names, e.g. "
"name:name2:name3:last_name . Name can not be empty, and it "
"has to match the order of partitions.");
DEFINE_string(in_file,
"",
"Path to input delta payload file used to hash/sign payloads "
"and apply delta over old_image (for debugging)");
DEFINE_string(out_file, "", "Path to output delta payload file");
DEFINE_string(out_hash_file, "", "Path to output hash file");
DEFINE_string(
out_metadata_hash_file, "", "Path to output metadata hash file");
DEFINE_string(
out_metadata_size_file, "", "Path to output metadata size file");
DEFINE_string(private_key, "", "Path to private key in .pem format");
DEFINE_string(public_key, "", "Path to public key in .pem format");
DEFINE_int32(
public_key_version, -1, "DEPRECATED. Key-check version # of client");
DEFINE_string(signature_size,
"",
"Raw signature size used for hash calculation. "
"You may pass in multiple sizes by colon separating them. E.g. "
"2048:2048:4096 will assume 3 signatures, the first two with "
"2048 size and the last 4096.");
DEFINE_string(payload_signature_file,
"",
"Raw signature file to sign payload with. To pass multiple "
"signatures, use a single argument with a colon between paths, "
"e.g. /path/to/sig:/path/to/next:/path/to/last_sig . Each "
"signature will be assigned a client version, starting from "
"kSignatureOriginalVersion.");
DEFINE_string(metadata_signature_file,
"",
"Raw signature file with the signature of the metadata hash. "
"To pass multiple signatures, use a single argument with a "
"colon between paths, "
"e.g. /path/to/sig:/path/to/next:/path/to/last_sig .");
DEFINE_int32(
chunk_size, 200 * 1024 * 1024, "Payload chunk size (-1 for whole files)");
DEFINE_uint64(rootfs_partition_size,
chromeos_update_engine::kRootFSPartitionSize,
"RootFS partition size for the image once installed");
DEFINE_uint64(
major_version, 2, "The major version of the payload being generated.");
DEFINE_int32(minor_version,
-1,
"The minor version of the payload being generated "
"(-1 means autodetect).");
DEFINE_string(properties_file,
"",
"If passed, dumps the payload properties of the payload passed "
"in --in_file and exits.");
DEFINE_int64(max_timestamp,
0,
"The maximum timestamp of the OS allowed to apply this "
"payload.");
DEFINE_string(old_channel,
"",
"The channel for the old image. 'dev-channel', 'npo-channel', "
"etc. Ignored, except during delta generation.");
DEFINE_string(old_board,
"",
"The board for the old image. 'x86-mario', 'lumpy', "
"etc. Ignored, except during delta generation.");
DEFINE_string(
old_version, "", "The build version of the old image. 1.2.3, etc.");
DEFINE_string(old_key,
"",
"The key used to sign the old image. 'premp', 'mp', 'mp-v3',"
" etc");
DEFINE_string(old_build_channel,
"",
"The channel for the build of the old image. 'dev-channel', "
"etc, but will never contain special channels such as "
"'npo-channel'. Ignored, except during delta generation.");
DEFINE_string(old_build_version,
"",
"The version of the build containing the old image.");
DEFINE_string(new_channel,
"",
"The channel for the new image. 'dev-channel', 'npo-channel', "
"etc. Ignored, except during delta generation.");
DEFINE_string(new_board,
"",
"The board for the new image. 'x86-mario', 'lumpy', "
"etc. Ignored, except during delta generation.");
DEFINE_string(
new_version, "", "The build version of the new image. 1.2.3, etc.");
DEFINE_string(new_key,
"",
"The key used to sign the new image. 'premp', 'mp', 'mp-v3',"
" etc");
DEFINE_string(new_build_channel,
"",
"The channel for the build of the new image. 'dev-channel', "
"etc, but will never contain special channels such as "
"'npo-channel'. Ignored, except during delta generation.");
DEFINE_string(new_build_version,
"",
"The version of the build containing the new image.");
DEFINE_string(new_postinstall_config_file,
"",
"A config file specifying postinstall related metadata. "
"Only allowed in major version 2 or newer.");
DEFINE_string(dynamic_partition_info_file,
"",
"An info file specifying dynamic partition metadata. "
"Only allowed in major version 2 or newer.");
brillo::FlagHelper::Init(
argc,
argv,
"Generates a payload to provide to ChromeOS' update_engine.\n\n"
"This tool can create full payloads and also delta payloads if the src\n"
"image is provided. It also provides debugging options to apply, sign\n"
"and verify payloads.");
Terminator::Init();
logging::LoggingSettings log_settings;
log_settings.log_file = "delta_generator.log";
log_settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
log_settings.lock_log = logging::LOCK_LOG_FILE;
log_settings.delete_old = logging::APPEND_TO_OLD_LOG_FILE;
logging::InitLogging(log_settings);
// Initialize the Xz compressor.
XzCompressInit();
vector<int> signature_sizes;
ParseSignatureSizes(FLAGS_signature_size, &signature_sizes);
if (!FLAGS_out_hash_file.empty() || !FLAGS_out_metadata_hash_file.empty()) {
CHECK(FLAGS_out_metadata_size_file.empty());
CalculateHashForSigning(signature_sizes,
FLAGS_out_hash_file,
FLAGS_out_metadata_hash_file,
FLAGS_in_file);
return 0;
}
if (!FLAGS_payload_signature_file.empty()) {
SignPayload(FLAGS_in_file,
FLAGS_out_file,
FLAGS_payload_signature_file,
FLAGS_metadata_signature_file,
FLAGS_out_metadata_size_file);
return 0;
}
if (!FLAGS_public_key.empty()) {
LOG_IF(WARNING, FLAGS_public_key_version != -1)
<< "--public_key_version is deprecated and ignored.";
return VerifySignedPayload(FLAGS_in_file, FLAGS_public_key);
}
if (!FLAGS_properties_file.empty()) {
return ExtractProperties(FLAGS_in_file, FLAGS_properties_file) ? 0 : 1;
}
// A payload generation was requested. Convert the flags to a
// PayloadGenerationConfig.
PayloadGenerationConfig payload_config;
vector<string> partition_names, old_partitions, new_partitions;
vector<string> old_mapfiles, new_mapfiles;
if (!FLAGS_old_mapfiles.empty()) {
old_mapfiles = base::SplitString(
FLAGS_old_mapfiles, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
}
if (!FLAGS_new_mapfiles.empty()) {
new_mapfiles = base::SplitString(
FLAGS_new_mapfiles, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
}
partition_names = base::SplitString(
FLAGS_partition_names, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
CHECK(!partition_names.empty());
if (FLAGS_major_version == kChromeOSMajorPayloadVersion ||
FLAGS_new_partitions.empty()) {
LOG_IF(FATAL, partition_names.size() != 2)
<< "To support more than 2 partitions, please use the "
<< "--new_partitions flag and major version 2.";
LOG_IF(FATAL,
partition_names[0] != kPartitionNameRoot ||
partition_names[1] != kPartitionNameKernel)
<< "To support non-default partition name, please use the "
<< "--new_partitions flag and major version 2.";
}
if (!FLAGS_new_partitions.empty()) {
LOG_IF(FATAL, !FLAGS_new_image.empty() || !FLAGS_new_kernel.empty())
<< "--new_image and --new_kernel are deprecated, please use "
<< "--new_partitions for all partitions.";
new_partitions = base::SplitString(
FLAGS_new_partitions, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
CHECK(partition_names.size() == new_partitions.size());
payload_config.is_delta = !FLAGS_old_partitions.empty();
LOG_IF(FATAL, !FLAGS_old_image.empty() || !FLAGS_old_kernel.empty())
<< "--old_image and --old_kernel are deprecated, please use "
<< "--old_partitions if you are using --new_partitions.";
} else {
new_partitions = {FLAGS_new_image, FLAGS_new_kernel};
LOG(WARNING) << "--new_partitions is empty, using deprecated --new_image "
<< "and --new_kernel flags.";
payload_config.is_delta =
!FLAGS_old_image.empty() || !FLAGS_old_kernel.empty();
LOG_IF(FATAL, !FLAGS_old_partitions.empty())
<< "Please use --new_partitions if you are using --old_partitions.";
}
for (size_t i = 0; i < partition_names.size(); i++) {
LOG_IF(FATAL, partition_names[i].empty())
<< "Partition name can't be empty, see --partition_names.";
payload_config.target.partitions.emplace_back(partition_names[i]);
payload_config.target.partitions.back().path = new_partitions[i];
if (i < new_mapfiles.size())
payload_config.target.partitions.back().mapfile_path = new_mapfiles[i];
}
if (payload_config.is_delta) {
if (!FLAGS_old_partitions.empty()) {
old_partitions = base::SplitString(FLAGS_old_partitions,
":",
base::TRIM_WHITESPACE,
base::SPLIT_WANT_ALL);
CHECK(old_partitions.size() == new_partitions.size());
} else {
old_partitions = {FLAGS_old_image, FLAGS_old_kernel};
LOG(WARNING) << "--old_partitions is empty, using deprecated --old_image "
<< "and --old_kernel flags.";
}
for (size_t i = 0; i < partition_names.size(); i++) {
payload_config.source.partitions.emplace_back(partition_names[i]);
payload_config.source.partitions.back().path = old_partitions[i];
if (i < old_mapfiles.size())
payload_config.source.partitions.back().mapfile_path = old_mapfiles[i];
}
}
if (!FLAGS_in_file.empty()) {
return ApplyPayload(FLAGS_in_file, payload_config) ? 0 : 1;
}
if (!FLAGS_new_postinstall_config_file.empty()) {
LOG_IF(FATAL, FLAGS_major_version == kChromeOSMajorPayloadVersion)
<< "Postinstall config is only allowed in major version 2 or newer.";
brillo::KeyValueStore store;
CHECK(store.Load(base::FilePath(FLAGS_new_postinstall_config_file)));
CHECK(payload_config.target.LoadPostInstallConfig(store));
}
// Use the default soft_chunk_size defined in the config.
payload_config.hard_chunk_size = FLAGS_chunk_size;
payload_config.block_size = kBlockSize;
// The partition size is never passed to the delta_generator, so we
// need to detect those from the provided files.
if (payload_config.is_delta) {
CHECK(payload_config.source.LoadImageSize());
}
CHECK(payload_config.target.LoadImageSize());
if (!FLAGS_dynamic_partition_info_file.empty()) {
LOG_IF(FATAL, FLAGS_major_version == kChromeOSMajorPayloadVersion)
<< "Dynamic partition info is only allowed in major version 2 or "
"newer.";
brillo::KeyValueStore store;
CHECK(store.Load(base::FilePath(FLAGS_dynamic_partition_info_file)));
CHECK(payload_config.target.LoadDynamicPartitionMetadata(store));
CHECK(payload_config.target.ValidateDynamicPartitionMetadata());
}
CHECK(!FLAGS_out_file.empty());
// Ignore failures. These are optional arguments.
ParseImageInfo(FLAGS_new_channel,
FLAGS_new_board,
FLAGS_new_version,
FLAGS_new_key,
FLAGS_new_build_channel,
FLAGS_new_build_version,
&payload_config.target.image_info);
// Ignore failures. These are optional arguments.
ParseImageInfo(FLAGS_old_channel,
FLAGS_old_board,
FLAGS_old_version,
FLAGS_old_key,
FLAGS_old_build_channel,
FLAGS_old_build_version,
&payload_config.source.image_info);
payload_config.rootfs_partition_size = FLAGS_rootfs_partition_size;
if (payload_config.is_delta) {
// Avoid opening the filesystem interface for full payloads.
for (PartitionConfig& part : payload_config.target.partitions)
CHECK(part.OpenFilesystem());
for (PartitionConfig& part : payload_config.source.partitions)
CHECK(part.OpenFilesystem());
}
payload_config.version.major = FLAGS_major_version;
LOG(INFO) << "Using provided major_version=" << FLAGS_major_version;
if (FLAGS_minor_version == -1) {
// Autodetect minor_version by looking at the update_engine.conf in the old
// image.
if (payload_config.is_delta) {
payload_config.version.minor = kInPlaceMinorPayloadVersion;
brillo::KeyValueStore store;
uint32_t minor_version;
for (const PartitionConfig& part : payload_config.source.partitions) {
if (part.fs_interface && part.fs_interface->LoadSettings(&store) &&
utils::GetMinorVersion(store, &minor_version)) {
payload_config.version.minor = minor_version;
break;
}
}
} else {
payload_config.version.minor = kFullPayloadMinorVersion;
}
LOG(INFO) << "Auto-detected minor_version=" << payload_config.version.minor;
} else {
payload_config.version.minor = FLAGS_minor_version;
LOG(INFO) << "Using provided minor_version=" << FLAGS_minor_version;
}
payload_config.max_timestamp = FLAGS_max_timestamp;
if (payload_config.version.minor >= kVerityMinorPayloadVersion)
CHECK(payload_config.target.LoadVerityConfig());
LOG(INFO) << "Generating " << (payload_config.is_delta ? "delta" : "full")
<< " update";
// From this point, all the options have been parsed.
if (!payload_config.Validate()) {
LOG(ERROR) << "Invalid options passed. See errors above.";
return 1;
}
uint64_t metadata_size;
if (!GenerateUpdatePayloadFile(
payload_config, FLAGS_out_file, FLAGS_private_key, &metadata_size)) {
return 1;
}
if (!FLAGS_out_metadata_size_file.empty()) {
string metadata_size_string = std::to_string(metadata_size);
CHECK(utils::WriteFile(FLAGS_out_metadata_size_file.c_str(),
metadata_size_string.data(),
metadata_size_string.size()));
}
return 0;
}
} // namespace
} // namespace chromeos_update_engine
int main(int argc, char** argv) {
return chromeos_update_engine::Main(argc, argv);
}