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 <string>
24#include <vector>
25
26#include <base/logging.h>
27#include <base/strings/string_number_conversions.h>
28#include <base/strings/string_split.h>
29#include <brillo/flag_helper.h>
30#include <brillo/key_value_store.h>
31
32#include "update_engine/common/prefs.h"
33#include "update_engine/common/terminator.h"
34#include "update_engine/common/utils.h"
35#include "update_engine/payload_consumer/delta_performer.h"
36#include "update_engine/payload_consumer/payload_constants.h"
37#include "update_engine/payload_generator/delta_diff_generator.h"
38#include "update_engine/payload_generator/delta_diff_utils.h"
39#include "update_engine/payload_generator/payload_generation_config.h"
40#include "update_engine/payload_generator/payload_signer.h"
41#include "update_engine/payload_generator/xz.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::string;
49using std::vector;
50
51namespace chromeos_update_engine {
52
53namespace {
54
55void ParseSignatureSizes(const string& signature_sizes_flag,
56                         vector<int>* signature_sizes) {
57  signature_sizes->clear();
58  vector<string> split_strings =
59      base::SplitString(signature_sizes_flag, ":", base::TRIM_WHITESPACE,
60                        base::SPLIT_WANT_ALL);
61  for (const string& str : split_strings) {
62    int size = 0;
63    bool parsing_successful = base::StringToInt(str, &size);
64    LOG_IF(FATAL, !parsing_successful)
65        << "Invalid signature size: " << str;
66
67    LOG_IF(FATAL, size != (2048 / 8)) <<
68        "Only signature sizes of 256 bytes are supported.";
69
70    signature_sizes->push_back(size);
71  }
72}
73
74bool ParseImageInfo(const string& channel,
75                    const string& board,
76                    const string& version,
77                    const string& key,
78                    const string& build_channel,
79                    const string& build_version,
80                    ImageInfo* image_info) {
81  // All of these arguments should be present or missing.
82  bool empty = channel.empty();
83
84  CHECK_EQ(channel.empty(), empty);
85  CHECK_EQ(board.empty(), empty);
86  CHECK_EQ(version.empty(), empty);
87  CHECK_EQ(key.empty(), empty);
88
89  if (empty)
90    return false;
91
92  image_info->set_channel(channel);
93  image_info->set_board(board);
94  image_info->set_version(version);
95  image_info->set_key(key);
96
97  image_info->set_build_channel(
98      build_channel.empty() ? channel : build_channel);
99
100  image_info->set_build_version(
101      build_version.empty() ? version : build_version);
102
103  return true;
104}
105
106void CalculateHashForSigning(const vector<int> &sizes,
107                             const string& out_hash_file,
108                             const string& out_metadata_hash_file,
109                             const string& in_file) {
110  LOG(INFO) << "Calculating hash for signing.";
111  LOG_IF(FATAL, in_file.empty())
112      << "Must pass --in_file to calculate hash for signing.";
113  LOG_IF(FATAL, out_hash_file.empty())
114      << "Must pass --out_hash_file to calculate hash for signing.";
115
116  brillo::Blob payload_hash, metadata_hash;
117  CHECK(PayloadSigner::HashPayloadForSigning(in_file, sizes, &payload_hash,
118                                             &metadata_hash));
119  CHECK(utils::WriteFile(out_hash_file.c_str(), payload_hash.data(),
120                         payload_hash.size()));
121  if (!out_metadata_hash_file.empty())
122    CHECK(utils::WriteFile(out_metadata_hash_file.c_str(), metadata_hash.data(),
123                           metadata_hash.size()));
124
125  LOG(INFO) << "Done calculating hash for signing.";
126}
127
128void SignatureFileFlagToBlobs(const string& signature_file_flag,
129                              vector<brillo::Blob>* signatures) {
130  vector<string> signature_files =
131      base::SplitString(signature_file_flag, ":", base::TRIM_WHITESPACE,
132                        base::SPLIT_WANT_ALL);
133  for (const string& signature_file : signature_files) {
134    brillo::Blob signature;
135    CHECK(utils::ReadFile(signature_file, &signature));
136    signatures->push_back(signature);
137  }
138}
139
140void SignPayload(const string& in_file,
141                 const string& out_file,
142                 const string& payload_signature_file,
143                 const string& metadata_signature_file,
144                 const string& out_metadata_size_file) {
145  LOG(INFO) << "Signing payload.";
146  LOG_IF(FATAL, in_file.empty())
147      << "Must pass --in_file to sign payload.";
148  LOG_IF(FATAL, out_file.empty())
149      << "Must pass --out_file to sign payload.";
150  LOG_IF(FATAL, payload_signature_file.empty())
151      << "Must pass --signature_file to sign payload.";
152  vector<brillo::Blob> signatures, metadata_signatures;
153  SignatureFileFlagToBlobs(payload_signature_file, &signatures);
154  SignatureFileFlagToBlobs(metadata_signature_file, &metadata_signatures);
155  uint64_t final_metadata_size;
156  CHECK(PayloadSigner::AddSignatureToPayload(in_file, signatures,
157      metadata_signatures, out_file, &final_metadata_size));
158  LOG(INFO) << "Done signing payload. Final metadata size = "
159            << final_metadata_size;
160  if (!out_metadata_size_file.empty()) {
161    string metadata_size_string = std::to_string(final_metadata_size);
162    CHECK(utils::WriteFile(out_metadata_size_file.c_str(),
163                           metadata_size_string.data(),
164                           metadata_size_string.size()));
165  }
166}
167
168void VerifySignedPayload(const string& in_file,
169                         const string& public_key) {
170  LOG(INFO) << "Verifying signed payload.";
171  LOG_IF(FATAL, in_file.empty())
172      << "Must pass --in_file to verify signed payload.";
173  LOG_IF(FATAL, public_key.empty())
174      << "Must pass --public_key to verify signed payload.";
175  CHECK(PayloadSigner::VerifySignedPayload(in_file, public_key));
176  LOG(INFO) << "Done verifying signed payload.";
177}
178
179// TODO(deymo): This function is likely broken for deltas minor version 2 or
180// newer. Move this function to a new file and make the delta_performer
181// integration tests use this instead.
182void ApplyDelta(const string& in_file,
183                const string& old_kernel,
184                const string& old_rootfs,
185                const string& prefs_dir) {
186  LOG(INFO) << "Applying delta.";
187  LOG_IF(FATAL, old_rootfs.empty())
188      << "Must pass --old_image to apply delta.";
189  Prefs prefs;
190  InstallPlan install_plan;
191  LOG(INFO) << "Setting up preferences under: " << prefs_dir;
192  LOG_IF(ERROR, !prefs.Init(base::FilePath(prefs_dir)))
193      << "Failed to initialize preferences.";
194  // Get original checksums
195  LOG(INFO) << "Calculating original checksums";
196  ImageConfig old_image;
197  old_image.partitions.emplace_back(kLegacyPartitionNameRoot);
198  old_image.partitions.back().path = old_rootfs;
199  old_image.partitions.emplace_back(kLegacyPartitionNameKernel);
200  old_image.partitions.back().path = old_kernel;
201  CHECK(old_image.LoadImageSize());
202  for (const auto& old_part : old_image.partitions) {
203    PartitionInfo part_info;
204    CHECK(diff_utils::InitializePartitionInfo(old_part, &part_info));
205    InstallPlan::Partition part;
206    part.name = old_part.name;
207    part.source_hash.assign(part_info.hash().begin(),
208                            part_info.hash().end());
209    part.source_path = old_part.path;
210    // Apply the delta in-place to the old_part.
211    part.target_path = old_part.path;
212    install_plan.partitions.push_back(part);
213  }
214
215  DeltaPerformer performer(&prefs, nullptr, nullptr, nullptr, &install_plan);
216  brillo::Blob buf(1024 * 1024);
217  int fd = open(in_file.c_str(), O_RDONLY, 0);
218  CHECK_GE(fd, 0);
219  ScopedFdCloser fd_closer(&fd);
220  for (off_t offset = 0;; offset += buf.size()) {
221    ssize_t bytes_read;
222    CHECK(utils::PReadAll(fd, buf.data(), buf.size(), offset, &bytes_read));
223    if (bytes_read == 0)
224      break;
225    CHECK_EQ(performer.Write(buf.data(), bytes_read), bytes_read);
226  }
227  CHECK_EQ(performer.Close(), 0);
228  DeltaPerformer::ResetUpdateProgress(&prefs, false);
229  LOG(INFO) << "Done applying delta.";
230}
231
232int ExtractProperties(const string& payload_path, const string& props_file) {
233  brillo::KeyValueStore properties;
234  TEST_AND_RETURN_FALSE(
235      PayloadSigner::ExtractPayloadProperties(payload_path, &properties));
236  if (props_file == "-") {
237    printf("%s", properties.SaveToString().c_str());
238  } else {
239    properties.Save(base::FilePath(props_file));
240    LOG(INFO) << "Generated properties file at " << props_file;
241  }
242  return true;
243}
244
245int Main(int argc, char** argv) {
246  DEFINE_string(old_image, "", "Path to the old rootfs");
247  DEFINE_string(new_image, "", "Path to the new rootfs");
248  DEFINE_string(old_kernel, "", "Path to the old kernel partition image");
249  DEFINE_string(new_kernel, "", "Path to the new kernel partition image");
250  DEFINE_string(old_partitions, "",
251                "Path to the old partitions. To pass multiple partitions, use "
252                "a single argument with a colon between paths, e.g. "
253                "/path/to/part:/path/to/part2::/path/to/last_part . Path can "
254                "be empty, but it has to match the order of partition_names.");
255  DEFINE_string(new_partitions, "",
256                "Path to the new partitions. To pass multiple partitions, use "
257                "a single argument with a colon between paths, e.g. "
258                "/path/to/part:/path/to/part2:/path/to/last_part . Path has "
259                "to match the order of partition_names.");
260  DEFINE_string(old_mapfiles,
261                "",
262                "Path to the .map files associated with the partition files "
263                "in the old partition. The .map file is normally generated "
264                "when creating the image in Android builds. Only recommended "
265                "for unsupported filesystem. Pass multiple files separated by "
266                "a colon as with -old_partitions.");
267  DEFINE_string(new_mapfiles,
268                "",
269                "Path to the .map files associated with the partition files "
270                "in the new partition, similar to the -old_mapfiles flag.");
271  DEFINE_string(partition_names,
272                string(kLegacyPartitionNameRoot) + ":" +
273                kLegacyPartitionNameKernel,
274                "Names of the partitions. To pass multiple names, use a single "
275                "argument with a colon between names, e.g. "
276                "name:name2:name3:last_name . Name can not be empty, and it "
277                "has to match the order of partitions.");
278  DEFINE_string(in_file, "",
279                "Path to input delta payload file used to hash/sign payloads "
280                "and apply delta over old_image (for debugging)");
281  DEFINE_string(out_file, "", "Path to output delta payload file");
282  DEFINE_string(out_hash_file, "", "Path to output hash file");
283  DEFINE_string(out_metadata_hash_file, "",
284                "Path to output metadata hash file");
285  DEFINE_string(out_metadata_size_file, "",
286                "Path to output metadata size file");
287  DEFINE_string(private_key, "", "Path to private key in .pem format");
288  DEFINE_string(public_key, "", "Path to public key in .pem format");
289  DEFINE_int32(public_key_version, -1,
290               "DEPRECATED. Key-check version # of client");
291  DEFINE_string(prefs_dir, "/tmp/update_engine_prefs",
292                "Preferences directory, used with apply_delta");
293  DEFINE_string(signature_size, "",
294                "Raw signature size used for hash calculation. "
295                "You may pass in multiple sizes by colon separating them. E.g. "
296                "2048:2048:4096 will assume 3 signatures, the first two with "
297                "2048 size and the last 4096.");
298  DEFINE_string(signature_file, "",
299                "Raw signature file to sign payload with. To pass multiple "
300                "signatures, use a single argument with a colon between paths, "
301                "e.g. /path/to/sig:/path/to/next:/path/to/last_sig . Each "
302                "signature will be assigned a client version, starting from "
303                "kSignatureOriginalVersion.");
304  DEFINE_string(metadata_signature_file, "",
305                "Raw signature file with the signature of the metadata hash. "
306                "To pass multiple signatures, use a single argument with a "
307                "colon between paths, "
308                "e.g. /path/to/sig:/path/to/next:/path/to/last_sig .");
309  DEFINE_int32(chunk_size, 200 * 1024 * 1024,
310               "Payload chunk size (-1 for whole files)");
311  DEFINE_uint64(rootfs_partition_size,
312               chromeos_update_engine::kRootFSPartitionSize,
313               "RootFS partition size for the image once installed");
314  DEFINE_uint64(major_version, 1,
315               "The major version of the payload being generated.");
316  DEFINE_int32(minor_version, -1,
317               "The minor version of the payload being generated "
318               "(-1 means autodetect).");
319  DEFINE_string(properties_file, "",
320                "If passed, dumps the payload properties of the payload passed "
321                "in --in_file and exits.");
322  DEFINE_string(zlib_fingerprint, "",
323                "The fingerprint of zlib in the source image in hash string "
324                "format, used to check imgdiff compatibility.");
325
326  DEFINE_string(old_channel, "",
327                "The channel for the old image. 'dev-channel', 'npo-channel', "
328                "etc. Ignored, except during delta generation.");
329  DEFINE_string(old_board, "",
330                "The board for the old image. 'x86-mario', 'lumpy', "
331                "etc. Ignored, except during delta generation.");
332  DEFINE_string(old_version, "",
333                "The build version of the old image. 1.2.3, etc.");
334  DEFINE_string(old_key, "",
335                "The key used to sign the old image. 'premp', 'mp', 'mp-v3',"
336                " etc");
337  DEFINE_string(old_build_channel, "",
338                "The channel for the build of the old image. 'dev-channel', "
339                "etc, but will never contain special channels such as "
340                "'npo-channel'. Ignored, except during delta generation.");
341  DEFINE_string(old_build_version, "",
342                "The version of the build containing the old image.");
343
344  DEFINE_string(new_channel, "",
345                "The channel for the new image. 'dev-channel', 'npo-channel', "
346                "etc. Ignored, except during delta generation.");
347  DEFINE_string(new_board, "",
348                "The board for the new image. 'x86-mario', 'lumpy', "
349                "etc. Ignored, except during delta generation.");
350  DEFINE_string(new_version, "",
351                "The build version of the new image. 1.2.3, etc.");
352  DEFINE_string(new_key, "",
353                "The key used to sign the new image. 'premp', 'mp', 'mp-v3',"
354                " etc");
355  DEFINE_string(new_build_channel, "",
356                "The channel for the build of the new image. 'dev-channel', "
357                "etc, but will never contain special channels such as "
358                "'npo-channel'. Ignored, except during delta generation.");
359  DEFINE_string(new_build_version, "",
360                "The version of the build containing the new image.");
361  DEFINE_string(new_postinstall_config_file, "",
362                "A config file specifying postinstall related metadata. "
363                "Only allowed in major version 2 or newer.");
364
365  brillo::FlagHelper::Init(argc, argv,
366      "Generates a payload to provide to ChromeOS' update_engine.\n\n"
367      "This tool can create full payloads and also delta payloads if the src\n"
368      "image is provided. It also provides debugging options to apply, sign\n"
369      "and verify payloads.");
370  Terminator::Init();
371
372  logging::LoggingSettings log_settings;
373  log_settings.log_file     = "delta_generator.log";
374  log_settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
375  log_settings.lock_log     = logging::LOCK_LOG_FILE;
376  log_settings.delete_old   = logging::APPEND_TO_OLD_LOG_FILE;
377
378  logging::InitLogging(log_settings);
379
380  // Initialize the Xz compressor.
381  XzCompressInit();
382
383  vector<int> signature_sizes;
384  ParseSignatureSizes(FLAGS_signature_size, &signature_sizes);
385
386  if (!FLAGS_out_hash_file.empty() || !FLAGS_out_metadata_hash_file.empty()) {
387    CHECK(FLAGS_out_metadata_size_file.empty());
388    CalculateHashForSigning(signature_sizes, FLAGS_out_hash_file,
389                            FLAGS_out_metadata_hash_file, FLAGS_in_file);
390    return 0;
391  }
392  if (!FLAGS_signature_file.empty()) {
393    SignPayload(FLAGS_in_file, FLAGS_out_file, FLAGS_signature_file,
394                FLAGS_metadata_signature_file, FLAGS_out_metadata_size_file);
395    return 0;
396  }
397  if (!FLAGS_public_key.empty()) {
398    LOG_IF(WARNING, FLAGS_public_key_version != -1)
399        << "--public_key_version is deprecated and ignored.";
400    VerifySignedPayload(FLAGS_in_file, FLAGS_public_key);
401    return 0;
402  }
403  if (!FLAGS_properties_file.empty()) {
404    return ExtractProperties(FLAGS_in_file, FLAGS_properties_file) ? 0 : 1;
405  }
406  if (!FLAGS_in_file.empty()) {
407    ApplyDelta(FLAGS_in_file, FLAGS_old_kernel, FLAGS_old_image,
408               FLAGS_prefs_dir);
409    return 0;
410  }
411
412  // A payload generation was requested. Convert the flags to a
413  // PayloadGenerationConfig.
414  PayloadGenerationConfig payload_config;
415  vector<string> partition_names, old_partitions, new_partitions;
416  vector<string> old_mapfiles, new_mapfiles;
417
418  if (!FLAGS_old_mapfiles.empty()) {
419    old_mapfiles = base::SplitString(
420        FLAGS_old_mapfiles, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
421  }
422  if (!FLAGS_new_mapfiles.empty()) {
423    new_mapfiles = base::SplitString(
424        FLAGS_new_mapfiles, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
425  }
426
427  partition_names =
428      base::SplitString(FLAGS_partition_names, ":", base::TRIM_WHITESPACE,
429                        base::SPLIT_WANT_ALL);
430  CHECK(!partition_names.empty());
431  if (FLAGS_major_version == kChromeOSMajorPayloadVersion ||
432      FLAGS_new_partitions.empty()) {
433    LOG_IF(FATAL, partition_names.size() != 2)
434        << "To support more than 2 partitions, please use the "
435        << "--new_partitions flag and major version 2.";
436    LOG_IF(FATAL, partition_names[0] != kLegacyPartitionNameRoot ||
437                  partition_names[1] != kLegacyPartitionNameKernel)
438        << "To support non-default partition name, please use the "
439        << "--new_partitions flag and major version 2.";
440  }
441
442  if (!FLAGS_new_partitions.empty()) {
443    LOG_IF(FATAL, !FLAGS_new_image.empty() || !FLAGS_new_kernel.empty())
444        << "--new_image and --new_kernel are deprecated, please use "
445        << "--new_partitions for all partitions.";
446    new_partitions =
447        base::SplitString(FLAGS_new_partitions, ":", base::TRIM_WHITESPACE,
448                          base::SPLIT_WANT_ALL);
449    CHECK(partition_names.size() == new_partitions.size());
450
451    payload_config.is_delta = !FLAGS_old_partitions.empty();
452    LOG_IF(FATAL, !FLAGS_old_image.empty() || !FLAGS_old_kernel.empty())
453        << "--old_image and --old_kernel are deprecated, please use "
454        << "--old_partitions if you are using --new_partitions.";
455  } else {
456    new_partitions = {FLAGS_new_image, FLAGS_new_kernel};
457    LOG(WARNING) << "--new_partitions is empty, using deprecated --new_image "
458                 << "and --new_kernel flags.";
459
460    payload_config.is_delta = !FLAGS_old_image.empty() ||
461                              !FLAGS_old_kernel.empty();
462    LOG_IF(FATAL, !FLAGS_old_partitions.empty())
463        << "Please use --new_partitions if you are using --old_partitions.";
464  }
465  for (size_t i = 0; i < partition_names.size(); i++) {
466    LOG_IF(FATAL, partition_names[i].empty())
467        << "Partition name can't be empty, see --partition_names.";
468    payload_config.target.partitions.emplace_back(partition_names[i]);
469    payload_config.target.partitions.back().path = new_partitions[i];
470    if (i < new_mapfiles.size())
471      payload_config.target.partitions.back().mapfile_path = new_mapfiles[i];
472  }
473
474  if (payload_config.is_delta) {
475    if (!FLAGS_old_partitions.empty()) {
476      old_partitions =
477          base::SplitString(FLAGS_old_partitions, ":", base::TRIM_WHITESPACE,
478                            base::SPLIT_WANT_ALL);
479      CHECK(old_partitions.size() == new_partitions.size());
480    } else {
481      old_partitions = {FLAGS_old_image, FLAGS_old_kernel};
482      LOG(WARNING) << "--old_partitions is empty, using deprecated --old_image "
483                   << "and --old_kernel flags.";
484    }
485    for (size_t i = 0; i < partition_names.size(); i++) {
486      payload_config.source.partitions.emplace_back(partition_names[i]);
487      payload_config.source.partitions.back().path = old_partitions[i];
488      if (i < old_mapfiles.size())
489        payload_config.source.partitions.back().mapfile_path = old_mapfiles[i];
490    }
491  }
492
493  if (!FLAGS_new_postinstall_config_file.empty()) {
494    LOG_IF(FATAL, FLAGS_major_version == kChromeOSMajorPayloadVersion)
495        << "Postinstall config is only allowed in major version 2 or newer.";
496    brillo::KeyValueStore store;
497    CHECK(store.Load(base::FilePath(FLAGS_new_postinstall_config_file)));
498    CHECK(payload_config.target.LoadPostInstallConfig(store));
499  }
500
501  // Use the default soft_chunk_size defined in the config.
502  payload_config.hard_chunk_size = FLAGS_chunk_size;
503  payload_config.block_size = kBlockSize;
504
505  // The partition size is never passed to the delta_generator, so we
506  // need to detect those from the provided files.
507  if (payload_config.is_delta) {
508    CHECK(payload_config.source.LoadImageSize());
509  }
510  CHECK(payload_config.target.LoadImageSize());
511
512  CHECK(!FLAGS_out_file.empty());
513
514  // Ignore failures. These are optional arguments.
515  ParseImageInfo(FLAGS_new_channel,
516                 FLAGS_new_board,
517                 FLAGS_new_version,
518                 FLAGS_new_key,
519                 FLAGS_new_build_channel,
520                 FLAGS_new_build_version,
521                 &payload_config.target.image_info);
522
523  // Ignore failures. These are optional arguments.
524  ParseImageInfo(FLAGS_old_channel,
525                 FLAGS_old_board,
526                 FLAGS_old_version,
527                 FLAGS_old_key,
528                 FLAGS_old_build_channel,
529                 FLAGS_old_build_version,
530                 &payload_config.source.image_info);
531
532  payload_config.rootfs_partition_size = FLAGS_rootfs_partition_size;
533
534  if (payload_config.is_delta) {
535    // Avoid opening the filesystem interface for full payloads.
536    for (PartitionConfig& part : payload_config.target.partitions)
537      CHECK(part.OpenFilesystem());
538    for (PartitionConfig& part : payload_config.source.partitions)
539      CHECK(part.OpenFilesystem());
540  }
541
542  payload_config.version.major = FLAGS_major_version;
543  LOG(INFO) << "Using provided major_version=" << FLAGS_major_version;
544
545  if (FLAGS_minor_version == -1) {
546    // Autodetect minor_version by looking at the update_engine.conf in the old
547    // image.
548    if (payload_config.is_delta) {
549      payload_config.version.minor = kInPlaceMinorPayloadVersion;
550      brillo::KeyValueStore store;
551      uint32_t minor_version;
552      for (const PartitionConfig& part : payload_config.source.partitions) {
553        if (part.fs_interface && part.fs_interface->LoadSettings(&store) &&
554            utils::GetMinorVersion(store, &minor_version)) {
555          payload_config.version.minor = minor_version;
556          break;
557        }
558      }
559    } else {
560      payload_config.version.minor = kFullPayloadMinorVersion;
561    }
562    LOG(INFO) << "Auto-detected minor_version=" << payload_config.version.minor;
563  } else {
564    payload_config.version.minor = FLAGS_minor_version;
565    LOG(INFO) << "Using provided minor_version=" << FLAGS_minor_version;
566  }
567
568  if (!FLAGS_zlib_fingerprint.empty()) {
569    if (utils::IsZlibCompatible(FLAGS_zlib_fingerprint)) {
570      payload_config.version.imgdiff_allowed = true;
571    } else {
572      LOG(INFO) << "IMGDIFF operation disabled due to fingerprint mismatch.";
573    }
574  }
575
576  if (payload_config.is_delta) {
577    LOG(INFO) << "Generating delta update";
578  } else {
579    LOG(INFO) << "Generating full update";
580  }
581
582  // From this point, all the options have been parsed.
583  if (!payload_config.Validate()) {
584    LOG(ERROR) << "Invalid options passed. See errors above.";
585    return 1;
586  }
587
588  uint64_t metadata_size;
589  if (!GenerateUpdatePayloadFile(payload_config,
590                                 FLAGS_out_file,
591                                 FLAGS_private_key,
592                                 &metadata_size)) {
593    return 1;
594  }
595  if (!FLAGS_out_metadata_size_file.empty()) {
596    string metadata_size_string = std::to_string(metadata_size);
597    CHECK(utils::WriteFile(FLAGS_out_metadata_size_file.c_str(),
598                           metadata_size_string.data(),
599                           metadata_size_string.size()));
600  }
601  return 0;
602}
603
604}  // namespace
605
606}  // namespace chromeos_update_engine
607
608int main(int argc, char** argv) {
609  return chromeos_update_engine::Main(argc, argv);
610}
611