generate_delta_main.cc revision 55c4f9ba7f5c59e3345f2c1869464433ffa8dc2b
1// 2// Copyright (C) 2010 The Android Open Source Project 3// 4// Licensed under the Apache License, Version 2.0 (the "License"); 5// you may not use this file except in compliance with the License. 6// You may obtain a copy of the License at 7// 8// http://www.apache.org/licenses/LICENSE-2.0 9// 10// Unless required by applicable law or agreed to in writing, software 11// distributed under the License is distributed on an "AS IS" BASIS, 12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13// See the License for the specific language governing permissions and 14// limitations under the License. 15// 16 17#include <errno.h> 18#include <fcntl.h> 19#include <sys/stat.h> 20#include <sys/types.h> 21#include <unistd.h> 22 23#include <set> 24#include <string> 25#include <vector> 26 27#include <base/logging.h> 28#include <base/strings/string_number_conversions.h> 29#include <base/strings/string_split.h> 30#include <brillo/flag_helper.h> 31#include <brillo/key_value_store.h> 32 33#include "update_engine/common/prefs.h" 34#include "update_engine/common/terminator.h" 35#include "update_engine/common/utils.h" 36#include "update_engine/payload_consumer/delta_performer.h" 37#include "update_engine/payload_consumer/payload_constants.h" 38#include "update_engine/payload_generator/delta_diff_generator.h" 39#include "update_engine/payload_generator/delta_diff_utils.h" 40#include "update_engine/payload_generator/payload_generation_config.h" 41#include "update_engine/payload_generator/payload_signer.h" 42#include "update_engine/update_metadata.pb.h" 43 44// This file contains a simple program that takes an old path, a new path, 45// and an output file as arguments and the path to an output file and 46// generates a delta that can be sent to Chrome OS clients. 47 48using std::set; 49using std::string; 50using std::vector; 51 52namespace chromeos_update_engine { 53 54namespace { 55 56void ParseSignatureSizes(const string& signature_sizes_flag, 57 vector<int>* signature_sizes) { 58 signature_sizes->clear(); 59 vector<string> split_strings = 60 base::SplitString(signature_sizes_flag, ":", base::TRIM_WHITESPACE, 61 base::SPLIT_WANT_ALL); 62 for (const string& str : split_strings) { 63 int size = 0; 64 bool parsing_successful = base::StringToInt(str, &size); 65 LOG_IF(FATAL, !parsing_successful) 66 << "Invalid signature size: " << str; 67 68 LOG_IF(FATAL, size != (2048 / 8)) << 69 "Only signature sizes of 256 bytes are supported."; 70 71 signature_sizes->push_back(size); 72 } 73} 74 75bool ParseImageInfo(const string& channel, 76 const string& board, 77 const string& version, 78 const string& key, 79 const string& build_channel, 80 const string& build_version, 81 ImageInfo* image_info) { 82 // All of these arguments should be present or missing. 83 bool empty = channel.empty(); 84 85 CHECK_EQ(channel.empty(), empty); 86 CHECK_EQ(board.empty(), empty); 87 CHECK_EQ(version.empty(), empty); 88 CHECK_EQ(key.empty(), empty); 89 90 if (empty) 91 return false; 92 93 image_info->set_channel(channel); 94 image_info->set_board(board); 95 image_info->set_version(version); 96 image_info->set_key(key); 97 98 image_info->set_build_channel( 99 build_channel.empty() ? channel : build_channel); 100 101 image_info->set_build_version( 102 build_version.empty() ? version : build_version); 103 104 return true; 105} 106 107void CalculateHashForSigning(const vector<int> &sizes, 108 const string& out_hash_file, 109 const string& out_metadata_hash_file, 110 const string& in_file) { 111 LOG(INFO) << "Calculating hash for signing."; 112 LOG_IF(FATAL, in_file.empty()) 113 << "Must pass --in_file to calculate hash for signing."; 114 LOG_IF(FATAL, out_hash_file.empty()) 115 << "Must pass --out_hash_file to calculate hash for signing."; 116 117 brillo::Blob payload_hash, metadata_hash; 118 CHECK(PayloadSigner::HashPayloadForSigning(in_file, sizes, &payload_hash, 119 &metadata_hash)); 120 CHECK(utils::WriteFile(out_hash_file.c_str(), payload_hash.data(), 121 payload_hash.size())); 122 if (!out_metadata_hash_file.empty()) 123 CHECK(utils::WriteFile(out_metadata_hash_file.c_str(), metadata_hash.data(), 124 metadata_hash.size())); 125 126 LOG(INFO) << "Done calculating hash for signing."; 127} 128 129void SignatureFileFlagToBlobs(const string& signature_file_flag, 130 vector<brillo::Blob>* signatures) { 131 vector<string> signature_files = 132 base::SplitString(signature_file_flag, ":", base::TRIM_WHITESPACE, 133 base::SPLIT_WANT_ALL); 134 for (const string& signature_file : signature_files) { 135 brillo::Blob signature; 136 CHECK(utils::ReadFile(signature_file, &signature)); 137 signatures->push_back(signature); 138 } 139} 140 141void SignPayload(const string& in_file, 142 const string& out_file, 143 const string& payload_signature_file, 144 const string& metadata_signature_file, 145 const string& out_metadata_size_file) { 146 LOG(INFO) << "Signing payload."; 147 LOG_IF(FATAL, in_file.empty()) 148 << "Must pass --in_file to sign payload."; 149 LOG_IF(FATAL, out_file.empty()) 150 << "Must pass --out_file to sign payload."; 151 LOG_IF(FATAL, payload_signature_file.empty()) 152 << "Must pass --signature_file to sign payload."; 153 vector<brillo::Blob> signatures, metadata_signatures; 154 SignatureFileFlagToBlobs(payload_signature_file, &signatures); 155 SignatureFileFlagToBlobs(metadata_signature_file, &metadata_signatures); 156 uint64_t final_metadata_size; 157 CHECK(PayloadSigner::AddSignatureToPayload(in_file, signatures, 158 metadata_signatures, out_file, &final_metadata_size)); 159 LOG(INFO) << "Done signing payload. Final metadata size = " 160 << final_metadata_size; 161 if (!out_metadata_size_file.empty()) { 162 string metadata_size_string = std::to_string(final_metadata_size); 163 CHECK(utils::WriteFile(out_metadata_size_file.c_str(), 164 metadata_size_string.data(), 165 metadata_size_string.size())); 166 } 167} 168 169void VerifySignedPayload(const string& in_file, 170 const string& public_key) { 171 LOG(INFO) << "Verifying signed payload."; 172 LOG_IF(FATAL, in_file.empty()) 173 << "Must pass --in_file to verify signed payload."; 174 LOG_IF(FATAL, public_key.empty()) 175 << "Must pass --public_key to verify signed payload."; 176 CHECK(PayloadSigner::VerifySignedPayload(in_file, public_key)); 177 LOG(INFO) << "Done verifying signed payload."; 178} 179 180// TODO(deymo): This function is likely broken for deltas minor version 2 or 181// newer. Move this function to a new file and make the delta_performer 182// integration tests use this instead. 183void ApplyDelta(const string& in_file, 184 const string& old_kernel, 185 const string& old_rootfs, 186 const string& prefs_dir) { 187 LOG(INFO) << "Applying delta."; 188 LOG_IF(FATAL, old_rootfs.empty()) 189 << "Must pass --old_image to apply delta."; 190 Prefs prefs; 191 InstallPlan install_plan; 192 LOG(INFO) << "Setting up preferences under: " << prefs_dir; 193 LOG_IF(ERROR, !prefs.Init(base::FilePath(prefs_dir))) 194 << "Failed to initialize preferences."; 195 // Get original checksums 196 LOG(INFO) << "Calculating original checksums"; 197 ImageConfig old_image; 198 old_image.partitions.emplace_back(kLegacyPartitionNameRoot); 199 old_image.partitions.back().path = old_rootfs; 200 old_image.partitions.emplace_back(kLegacyPartitionNameKernel); 201 old_image.partitions.back().path = old_kernel; 202 CHECK(old_image.LoadImageSize()); 203 for (const auto& old_part : old_image.partitions) { 204 PartitionInfo part_info; 205 CHECK(diff_utils::InitializePartitionInfo(old_part, &part_info)); 206 InstallPlan::Partition part; 207 part.name = old_part.name; 208 part.source_hash.assign(part_info.hash().begin(), 209 part_info.hash().end()); 210 part.source_path = old_part.path; 211 // Apply the delta in-place to the old_part. 212 part.target_path = old_part.path; 213 install_plan.partitions.push_back(part); 214 } 215 216 DeltaPerformer performer(&prefs, nullptr, nullptr, nullptr, &install_plan); 217 brillo::Blob buf(1024 * 1024); 218 int fd = open(in_file.c_str(), O_RDONLY, 0); 219 CHECK_GE(fd, 0); 220 ScopedFdCloser fd_closer(&fd); 221 for (off_t offset = 0;; offset += buf.size()) { 222 ssize_t bytes_read; 223 CHECK(utils::PReadAll(fd, buf.data(), buf.size(), offset, &bytes_read)); 224 if (bytes_read == 0) 225 break; 226 CHECK_EQ(performer.Write(buf.data(), bytes_read), bytes_read); 227 } 228 CHECK_EQ(performer.Close(), 0); 229 DeltaPerformer::ResetUpdateProgress(&prefs, false); 230 LOG(INFO) << "Done applying delta."; 231} 232 233int ExtractProperties(const string& payload_path, const string& props_file) { 234 brillo::KeyValueStore properties; 235 TEST_AND_RETURN_FALSE( 236 PayloadSigner::ExtractPayloadProperties(payload_path, &properties)); 237 if (props_file == "-") { 238 printf("%s", properties.SaveToString().c_str()); 239 } else { 240 properties.Save(base::FilePath(props_file)); 241 LOG(INFO) << "Generated properties file at " << props_file; 242 } 243 return true; 244} 245 246int Main(int argc, char** argv) { 247 DEFINE_string(old_image, "", "Path to the old rootfs"); 248 DEFINE_string(new_image, "", "Path to the new rootfs"); 249 DEFINE_string(old_kernel, "", "Path to the old kernel partition image"); 250 DEFINE_string(new_kernel, "", "Path to the new kernel partition image"); 251 DEFINE_string(old_partitions, "", 252 "Path to the old partitions. To pass multiple partitions, use " 253 "a single argument with a colon between paths, e.g. " 254 "/path/to/part:/path/to/part2::/path/to/last_part . Path can " 255 "be empty, but it has to match the order of partition_names."); 256 DEFINE_string(new_partitions, "", 257 "Path to the new partitions. To pass multiple partitions, use " 258 "a single argument with a colon between paths, e.g. " 259 "/path/to/part:/path/to/part2:/path/to/last_part . Path has " 260 "to match the order of partition_names."); 261 DEFINE_string(partition_names, 262 string(kLegacyPartitionNameRoot) + ":" + 263 kLegacyPartitionNameKernel, 264 "Names of the partitions. To pass multiple names, use a single " 265 "argument with a colon between names, e.g. " 266 "name:name2:name3:last_name . Name can not be empty, and it " 267 "has to match the order of partitions."); 268 DEFINE_string(in_file, "", 269 "Path to input delta payload file used to hash/sign payloads " 270 "and apply delta over old_image (for debugging)"); 271 DEFINE_string(out_file, "", "Path to output delta payload file"); 272 DEFINE_string(out_hash_file, "", "Path to output hash file"); 273 DEFINE_string(out_metadata_hash_file, "", 274 "Path to output metadata hash file"); 275 DEFINE_string(out_metadata_size_file, "", 276 "Path to output metadata size file"); 277 DEFINE_string(private_key, "", "Path to private key in .pem format"); 278 DEFINE_string(public_key, "", "Path to public key in .pem format"); 279 DEFINE_int32(public_key_version, -1, 280 "DEPRECATED. Key-check version # of client"); 281 DEFINE_string(prefs_dir, "/tmp/update_engine_prefs", 282 "Preferences directory, used with apply_delta"); 283 DEFINE_string(signature_size, "", 284 "Raw signature size used for hash calculation. " 285 "You may pass in multiple sizes by colon separating them. E.g. " 286 "2048:2048:4096 will assume 3 signatures, the first two with " 287 "2048 size and the last 4096."); 288 DEFINE_string(signature_file, "", 289 "Raw signature file to sign payload with. To pass multiple " 290 "signatures, use a single argument with a colon between paths, " 291 "e.g. /path/to/sig:/path/to/next:/path/to/last_sig . Each " 292 "signature will be assigned a client version, starting from " 293 "kSignatureOriginalVersion."); 294 DEFINE_string(metadata_signature_file, "", 295 "Raw signature file with the signature of the metadata hash. " 296 "To pass multiple signatures, use a single argument with a " 297 "colon between paths, " 298 "e.g. /path/to/sig:/path/to/next:/path/to/last_sig ."); 299 DEFINE_int32(chunk_size, 200 * 1024 * 1024, 300 "Payload chunk size (-1 for whole files)"); 301 DEFINE_uint64(rootfs_partition_size, 302 chromeos_update_engine::kRootFSPartitionSize, 303 "RootFS partition size for the image once installed"); 304 DEFINE_uint64(major_version, 1, 305 "The major version of the payload being generated."); 306 DEFINE_int32(minor_version, -1, 307 "The minor version of the payload being generated " 308 "(-1 means autodetect)."); 309 DEFINE_string(properties_file, "", 310 "If passed, dumps the payload properties of the payload passed " 311 "in --in_file and exits."); 312 313 DEFINE_string(old_channel, "", 314 "The channel for the old image. 'dev-channel', 'npo-channel', " 315 "etc. Ignored, except during delta generation."); 316 DEFINE_string(old_board, "", 317 "The board for the old image. 'x86-mario', 'lumpy', " 318 "etc. Ignored, except during delta generation."); 319 DEFINE_string(old_version, "", 320 "The build version of the old image. 1.2.3, etc."); 321 DEFINE_string(old_key, "", 322 "The key used to sign the old image. 'premp', 'mp', 'mp-v3'," 323 " etc"); 324 DEFINE_string(old_build_channel, "", 325 "The channel for the build of the old image. 'dev-channel', " 326 "etc, but will never contain special channels such as " 327 "'npo-channel'. Ignored, except during delta generation."); 328 DEFINE_string(old_build_version, "", 329 "The version of the build containing the old image."); 330 331 DEFINE_string(new_channel, "", 332 "The channel for the new image. 'dev-channel', 'npo-channel', " 333 "etc. Ignored, except during delta generation."); 334 DEFINE_string(new_board, "", 335 "The board for the new image. 'x86-mario', 'lumpy', " 336 "etc. Ignored, except during delta generation."); 337 DEFINE_string(new_version, "", 338 "The build version of the new image. 1.2.3, etc."); 339 DEFINE_string(new_key, "", 340 "The key used to sign the new image. 'premp', 'mp', 'mp-v3'," 341 " etc"); 342 DEFINE_string(new_build_channel, "", 343 "The channel for the build of the new image. 'dev-channel', " 344 "etc, but will never contain special channels such as " 345 "'npo-channel'. Ignored, except during delta generation."); 346 DEFINE_string(new_build_version, "", 347 "The version of the build containing the new image."); 348 DEFINE_string(new_postinstall_config_file, "", 349 "A config file specifying postinstall related metadata. " 350 "Only allowed in major version 2 or newer."); 351 352 brillo::FlagHelper::Init(argc, argv, 353 "Generates a payload to provide to ChromeOS' update_engine.\n\n" 354 "This tool can create full payloads and also delta payloads if the src\n" 355 "image is provided. It also provides debugging options to apply, sign\n" 356 "and verify payloads."); 357 Terminator::Init(); 358 359 logging::LoggingSettings log_settings; 360 log_settings.log_file = "delta_generator.log"; 361 log_settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG; 362 log_settings.lock_log = logging::LOCK_LOG_FILE; 363 log_settings.delete_old = logging::APPEND_TO_OLD_LOG_FILE; 364 365 logging::InitLogging(log_settings); 366 367 vector<int> signature_sizes; 368 ParseSignatureSizes(FLAGS_signature_size, &signature_sizes); 369 370 if (!FLAGS_out_hash_file.empty() || !FLAGS_out_metadata_hash_file.empty()) { 371 CHECK(FLAGS_out_metadata_size_file.empty()); 372 CalculateHashForSigning(signature_sizes, FLAGS_out_hash_file, 373 FLAGS_out_metadata_hash_file, FLAGS_in_file); 374 return 0; 375 } 376 if (!FLAGS_signature_file.empty()) { 377 SignPayload(FLAGS_in_file, FLAGS_out_file, FLAGS_signature_file, 378 FLAGS_metadata_signature_file, FLAGS_out_metadata_size_file); 379 return 0; 380 } 381 if (!FLAGS_public_key.empty()) { 382 LOG_IF(WARNING, FLAGS_public_key_version != -1) 383 << "--public_key_version is deprecated and ignored."; 384 VerifySignedPayload(FLAGS_in_file, FLAGS_public_key); 385 return 0; 386 } 387 if (!FLAGS_properties_file.empty()) { 388 return ExtractProperties(FLAGS_in_file, FLAGS_properties_file) ? 0 : 1; 389 } 390 if (!FLAGS_in_file.empty()) { 391 ApplyDelta(FLAGS_in_file, FLAGS_old_kernel, FLAGS_old_image, 392 FLAGS_prefs_dir); 393 return 0; 394 } 395 396 // A payload generation was requested. Convert the flags to a 397 // PayloadGenerationConfig. 398 PayloadGenerationConfig payload_config; 399 vector<string> partition_names, old_partitions, new_partitions; 400 401 partition_names = 402 base::SplitString(FLAGS_partition_names, ":", base::TRIM_WHITESPACE, 403 base::SPLIT_WANT_ALL); 404 CHECK(!partition_names.empty()); 405 if (FLAGS_major_version == kChromeOSMajorPayloadVersion || 406 FLAGS_new_partitions.empty()) { 407 LOG_IF(FATAL, partition_names.size() != 2) 408 << "To support more than 2 partitions, please use the " 409 << "--new_partitions flag and major version 2."; 410 LOG_IF(FATAL, partition_names[0] != kLegacyPartitionNameRoot || 411 partition_names[1] != kLegacyPartitionNameKernel) 412 << "To support non-default partition name, please use the " 413 << "--new_partitions flag and major version 2."; 414 } 415 416 if (!FLAGS_new_partitions.empty()) { 417 LOG_IF(FATAL, !FLAGS_new_image.empty() || !FLAGS_new_kernel.empty()) 418 << "--new_image and --new_kernel are deprecated, please use " 419 << "--new_partitions for all partitions."; 420 new_partitions = 421 base::SplitString(FLAGS_new_partitions, ":", base::TRIM_WHITESPACE, 422 base::SPLIT_WANT_ALL); 423 CHECK(partition_names.size() == new_partitions.size()); 424 425 payload_config.is_delta = !FLAGS_old_partitions.empty(); 426 LOG_IF(FATAL, !FLAGS_old_image.empty() || !FLAGS_old_kernel.empty()) 427 << "--old_image and --old_kernel are deprecated, please use " 428 << "--old_partitions if you are using --new_partitions."; 429 } else { 430 new_partitions = {FLAGS_new_image, FLAGS_new_kernel}; 431 LOG(WARNING) << "--new_partitions is empty, using deprecated --new_image " 432 << "and --new_kernel flags."; 433 434 payload_config.is_delta = !FLAGS_old_image.empty() || 435 !FLAGS_old_kernel.empty(); 436 LOG_IF(FATAL, !FLAGS_old_partitions.empty()) 437 << "Please use --new_partitions if you are using --old_partitions."; 438 } 439 for (size_t i = 0; i < partition_names.size(); i++) { 440 LOG_IF(FATAL, partition_names[i].empty()) 441 << "Partition name can't be empty, see --partition_names."; 442 payload_config.target.partitions.emplace_back(partition_names[i]); 443 payload_config.target.partitions.back().path = new_partitions[i]; 444 } 445 446 if (payload_config.is_delta) { 447 if (!FLAGS_old_partitions.empty()) { 448 old_partitions = 449 base::SplitString(FLAGS_old_partitions, ":", base::TRIM_WHITESPACE, 450 base::SPLIT_WANT_ALL); 451 CHECK(old_partitions.size() == new_partitions.size()); 452 } else { 453 old_partitions = {FLAGS_old_image, FLAGS_old_kernel}; 454 LOG(WARNING) << "--old_partitions is empty, using deprecated --old_image " 455 << "and --old_kernel flags."; 456 } 457 for (size_t i = 0; i < partition_names.size(); i++) { 458 payload_config.source.partitions.emplace_back(partition_names[i]); 459 payload_config.source.partitions.back().path = old_partitions[i]; 460 } 461 } 462 463 if (!FLAGS_new_postinstall_config_file.empty()) { 464 LOG_IF(FATAL, FLAGS_major_version == kChromeOSMajorPayloadVersion) 465 << "Postinstall config is only allowed in major version 2 or newer."; 466 brillo::KeyValueStore store; 467 CHECK(store.Load(base::FilePath(FLAGS_new_postinstall_config_file))); 468 CHECK(payload_config.target.LoadPostInstallConfig(store)); 469 } 470 471 // Use the default soft_chunk_size defined in the config. 472 payload_config.hard_chunk_size = FLAGS_chunk_size; 473 payload_config.block_size = kBlockSize; 474 475 // The partition size is never passed to the delta_generator, so we 476 // need to detect those from the provided files. 477 if (payload_config.is_delta) { 478 CHECK(payload_config.source.LoadImageSize()); 479 } 480 CHECK(payload_config.target.LoadImageSize()); 481 482 CHECK(!FLAGS_out_file.empty()); 483 484 // Ignore failures. These are optional arguments. 485 ParseImageInfo(FLAGS_new_channel, 486 FLAGS_new_board, 487 FLAGS_new_version, 488 FLAGS_new_key, 489 FLAGS_new_build_channel, 490 FLAGS_new_build_version, 491 &payload_config.target.image_info); 492 493 // Ignore failures. These are optional arguments. 494 ParseImageInfo(FLAGS_old_channel, 495 FLAGS_old_board, 496 FLAGS_old_version, 497 FLAGS_old_key, 498 FLAGS_old_build_channel, 499 FLAGS_old_build_version, 500 &payload_config.source.image_info); 501 502 payload_config.rootfs_partition_size = FLAGS_rootfs_partition_size; 503 504 if (payload_config.is_delta) { 505 // Avoid opening the filesystem interface for full payloads. 506 for (PartitionConfig& part : payload_config.target.partitions) 507 CHECK(part.OpenFilesystem()); 508 for (PartitionConfig& part : payload_config.source.partitions) 509 CHECK(part.OpenFilesystem()); 510 } 511 512 payload_config.major_version = FLAGS_major_version; 513 LOG(INFO) << "Using provided major_version=" << FLAGS_major_version; 514 515 if (FLAGS_minor_version == -1) { 516 // Autodetect minor_version by looking at the update_engine.conf in the old 517 // image. 518 if (payload_config.is_delta) { 519 payload_config.minor_version = kInPlaceMinorPayloadVersion; 520 brillo::KeyValueStore store; 521 uint32_t minor_version; 522 for (const PartitionConfig& part : payload_config.source.partitions) { 523 if (part.fs_interface && part.fs_interface->LoadSettings(&store) && 524 utils::GetMinorVersion(store, &minor_version)) { 525 payload_config.minor_version = minor_version; 526 break; 527 } 528 } 529 } else { 530 payload_config.minor_version = kFullPayloadMinorVersion; 531 } 532 LOG(INFO) << "Auto-detected minor_version=" << payload_config.minor_version; 533 } else { 534 payload_config.minor_version = FLAGS_minor_version; 535 LOG(INFO) << "Using provided minor_version=" << FLAGS_minor_version; 536 } 537 538 if (payload_config.minor_version >= kImgdiffMinorPayloadVersion) { 539 // TODO(senj): Check if the zlib version in source and target are the same. 540 payload_config.imgdiff_allowed = true; 541 } 542 543 if (payload_config.is_delta) { 544 LOG(INFO) << "Generating delta update"; 545 } else { 546 LOG(INFO) << "Generating full update"; 547 } 548 549 // From this point, all the options have been parsed. 550 if (!payload_config.Validate()) { 551 LOG(ERROR) << "Invalid options passed. See errors above."; 552 return 1; 553 } 554 555 uint64_t metadata_size; 556 if (!GenerateUpdatePayloadFile(payload_config, 557 FLAGS_out_file, 558 FLAGS_private_key, 559 &metadata_size)) { 560 return 1; 561 } 562 if (!FLAGS_out_metadata_size_file.empty()) { 563 string metadata_size_string = std::to_string(metadata_size); 564 CHECK(utils::WriteFile(FLAGS_out_metadata_size_file.c_str(), 565 metadata_size_string.data(), 566 metadata_size_string.size())); 567 } 568 return 0; 569} 570 571} // namespace 572 573} // namespace chromeos_update_engine 574 575int main(int argc, char** argv) { 576 return chromeos_update_engine::Main(argc, argv); 577} 578