| // Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "update_engine/payload_generator/delta_diff_generator.h" |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| |
| #include <algorithm> |
| #include <map> |
| #include <memory> |
| #include <string> |
| #include <utility> |
| #include <vector> |
| |
| #include <base/files/file_path.h> |
| #include <base/files/file_util.h> |
| #include <base/logging.h> |
| #include <base/strings/stringprintf.h> |
| #include <base/strings/string_util.h> |
| #include <bzlib.h> |
| |
| #include "update_engine/bzip.h" |
| #include "update_engine/delta_performer.h" |
| #include "update_engine/file_writer.h" |
| #include "update_engine/omaha_hash_calculator.h" |
| #include "update_engine/payload_constants.h" |
| #include "update_engine/payload_generator/extent_mapper.h" |
| #include "update_engine/payload_generator/filesystem_iterator.h" |
| #include "update_engine/payload_generator/full_update_generator.h" |
| #include "update_engine/payload_generator/graph_types.h" |
| #include "update_engine/payload_generator/graph_utils.h" |
| #include "update_engine/payload_generator/inplace_generator.h" |
| #include "update_engine/payload_generator/metadata.h" |
| #include "update_engine/payload_generator/payload_signer.h" |
| #include "update_engine/payload_verifier.h" |
| #include "update_engine/subprocess.h" |
| #include "update_engine/update_metadata.pb.h" |
| #include "update_engine/utils.h" |
| |
| using std::map; |
| using std::max; |
| using std::min; |
| using std::set; |
| using std::string; |
| using std::unique_ptr; |
| using std::vector; |
| |
| namespace { |
| |
| const uint64_t kMajorVersionNumber = 1; |
| |
| // The maximum destination size allowed for bsdiff. In general, bsdiff should |
| // work for arbitrary big files, but the payload generation and payload |
| // application requires a significant amount of RAM. We put a hard-limit of |
| // 200 MiB that should not affect any released board, but will limit the |
| // Chrome binary in ASan builders. |
| const off_t kMaxBsdiffDestinationSize = 200 * 1024 * 1024; // bytes |
| |
| static const char* kInstallOperationTypes[] = { |
| "REPLACE", |
| "REPLACE_BZ", |
| "MOVE", |
| "BSDIFF", |
| "SOURCE_COPY", |
| "SOURCE_BSDIFF" |
| }; |
| |
| } // namespace |
| |
| namespace chromeos_update_engine { |
| |
| typedef DeltaDiffGenerator::Block Block; |
| typedef map<const DeltaArchiveManifest_InstallOperation*, |
| string> OperationNameMap; |
| |
| // bytes |
| const size_t kRootFSPartitionSize = static_cast<size_t>(2) * 1024 * 1024 * 1024; |
| const size_t kBlockSize = 4096; // bytes |
| const char* const kEmptyPath = ""; |
| const char* const kBsdiffPath = "bsdiff"; |
| |
| // Needed for testing purposes, in case we can't use actual filesystem objects. |
| // TODO(garnold) (chromium:331965) Replace this hack with a properly injected |
| // parameter in form of a mockable abstract class. |
| bool (*get_extents_with_chunk_func)(const string&, off_t, off_t, |
| vector<Extent>*) = |
| extent_mapper::ExtentsForFileChunkFibmap; |
| |
| namespace { |
| |
| // Stores all the extents of |path| into |extents|. Returns true on success. |
| bool GatherExtents(const string& path, |
| off_t chunk_offset, |
| off_t chunk_size, |
| vector<Extent>* extents) { |
| extents->clear(); |
| TEST_AND_RETURN_FALSE( |
| get_extents_with_chunk_func( |
| path, chunk_offset, chunk_size, extents)); |
| return true; |
| } |
| |
| // Writes the uint64_t passed in in host-endian to the file as big-endian. |
| // Returns true on success. |
| bool WriteUint64AsBigEndian(FileWriter* writer, const uint64_t value) { |
| uint64_t value_be = htobe64(value); |
| TEST_AND_RETURN_FALSE(writer->Write(&value_be, sizeof(value_be))); |
| return true; |
| } |
| |
| // Adds each operation from |rootfs_ops| and |kernel_ops| to |out_manifest| in |
| // the order they come in those vectors. reports the operations names |
| void InstallOperationsToManifest( |
| const vector<AnnotatedOperation>& rootfs_ops, |
| const vector<AnnotatedOperation>& kernel_ops, |
| DeltaArchiveManifest* out_manifest, |
| OperationNameMap* out_op_name_map) { |
| for (const AnnotatedOperation& aop : rootfs_ops) { |
| if (DeltaDiffGenerator::IsNoopOperation(aop.op)) |
| continue; |
| DeltaArchiveManifest_InstallOperation* new_op = |
| out_manifest->add_install_operations(); |
| (*out_op_name_map)[new_op] = aop.name; |
| *new_op = aop.op; |
| } |
| for (const AnnotatedOperation& aop : kernel_ops) { |
| if (DeltaDiffGenerator::IsNoopOperation(aop.op)) |
| continue; |
| DeltaArchiveManifest_InstallOperation* new_op = |
| out_manifest->add_kernel_install_operations(); |
| (*out_op_name_map)[new_op] = aop.name; |
| *new_op = aop.op; |
| } |
| } |
| |
| struct DeltaObject { |
| DeltaObject(const string& in_name, const int in_type, const off_t in_size) |
| : name(in_name), |
| type(in_type), |
| size(in_size) {} |
| bool operator <(const DeltaObject& object) const { |
| return (size != object.size) ? (size < object.size) : (name < object.name); |
| } |
| string name; |
| int type; |
| off_t size; |
| }; |
| |
| void ReportPayloadUsage(const DeltaArchiveManifest& manifest, |
| const int64_t manifest_metadata_size, |
| const OperationNameMap& op_name_map) { |
| vector<DeltaObject> objects; |
| off_t total_size = 0; |
| |
| // Rootfs install operations. |
| for (int i = 0; i < manifest.install_operations_size(); ++i) { |
| const DeltaArchiveManifest_InstallOperation& op = |
| manifest.install_operations(i); |
| objects.push_back(DeltaObject(op_name_map.find(&op)->second, |
| op.type(), |
| op.data_length())); |
| total_size += op.data_length(); |
| } |
| |
| // Kernel install operations. |
| for (int i = 0; i < manifest.kernel_install_operations_size(); ++i) { |
| const DeltaArchiveManifest_InstallOperation& op = |
| manifest.kernel_install_operations(i); |
| objects.push_back(DeltaObject(base::StringPrintf("<kernel-operation-%d>", |
| i), |
| op.type(), |
| op.data_length())); |
| total_size += op.data_length(); |
| } |
| |
| objects.push_back(DeltaObject("<manifest-metadata>", |
| -1, |
| manifest_metadata_size)); |
| total_size += manifest_metadata_size; |
| |
| std::sort(objects.begin(), objects.end()); |
| |
| static const char kFormatString[] = "%6.2f%% %10jd %-10s %s\n"; |
| for (const DeltaObject& object : objects) { |
| fprintf(stderr, kFormatString, |
| object.size * 100.0 / total_size, |
| static_cast<intmax_t>(object.size), |
| object.type >= 0 ? kInstallOperationTypes[object.type] : "-", |
| object.name.c_str()); |
| } |
| fprintf(stderr, kFormatString, |
| 100.0, static_cast<intmax_t>(total_size), "", "<total>"); |
| } |
| |
| // Process a range of blocks from |range_start| to |range_end| in the extent at |
| // position |*idx_p| of |extents|. If |do_remove| is true, this range will be |
| // removed, which may cause the extent to be trimmed, split or removed entirely. |
| // The value of |*idx_p| is updated to point to the next extent to be processed. |
| // Returns true iff the next extent to process is a new or updated one. |
| bool ProcessExtentBlockRange(vector<Extent>* extents, size_t* idx_p, |
| const bool do_remove, uint64_t range_start, |
| uint64_t range_end) { |
| size_t idx = *idx_p; |
| uint64_t start_block = (*extents)[idx].start_block(); |
| uint64_t num_blocks = (*extents)[idx].num_blocks(); |
| uint64_t range_size = range_end - range_start; |
| |
| if (do_remove) { |
| if (range_size == num_blocks) { |
| // Remove the entire extent. |
| extents->erase(extents->begin() + idx); |
| } else if (range_end == num_blocks) { |
| // Trim the end of the extent. |
| (*extents)[idx].set_num_blocks(num_blocks - range_size); |
| idx++; |
| } else if (range_start == 0) { |
| // Trim the head of the extent. |
| (*extents)[idx].set_start_block(start_block + range_size); |
| (*extents)[idx].set_num_blocks(num_blocks - range_size); |
| } else { |
| // Trim the middle, splitting the remainder into two parts. |
| (*extents)[idx].set_num_blocks(range_start); |
| Extent e; |
| e.set_start_block(start_block + range_end); |
| e.set_num_blocks(num_blocks - range_end); |
| idx++; |
| extents->insert(extents->begin() + idx, e); |
| } |
| } else if (range_end == num_blocks) { |
| // Done with this extent. |
| idx++; |
| } else { |
| return false; |
| } |
| |
| *idx_p = idx; |
| return true; |
| } |
| |
| // Remove identical corresponding block ranges in |src_extents| and |
| // |dst_extents|. Used for preventing moving of blocks onto themselves during |
| // MOVE operations. The value of |total_bytes| indicates the actual length of |
| // content; this may be slightly less than the total size of blocks, in which |
| // case the last block is only partly occupied with data. Returns the total |
| // number of bytes removed. |
| size_t RemoveIdenticalBlockRanges(vector<Extent>* src_extents, |
| vector<Extent>* dst_extents, |
| const size_t total_bytes) { |
| size_t src_idx = 0; |
| size_t dst_idx = 0; |
| uint64_t src_offset = 0, dst_offset = 0; |
| bool new_src = true, new_dst = true; |
| size_t removed_bytes = 0, nonfull_block_bytes; |
| bool do_remove = false; |
| while (src_idx < src_extents->size() && dst_idx < dst_extents->size()) { |
| if (new_src) { |
| src_offset = 0; |
| new_src = false; |
| } |
| if (new_dst) { |
| dst_offset = 0; |
| new_dst = false; |
| } |
| |
| do_remove = ((*src_extents)[src_idx].start_block() + src_offset == |
| (*dst_extents)[dst_idx].start_block() + dst_offset); |
| |
| uint64_t src_num_blocks = (*src_extents)[src_idx].num_blocks(); |
| uint64_t dst_num_blocks = (*dst_extents)[dst_idx].num_blocks(); |
| uint64_t min_num_blocks = min(src_num_blocks - src_offset, |
| dst_num_blocks - dst_offset); |
| uint64_t prev_src_offset = src_offset; |
| uint64_t prev_dst_offset = dst_offset; |
| src_offset += min_num_blocks; |
| dst_offset += min_num_blocks; |
| |
| new_src = ProcessExtentBlockRange(src_extents, &src_idx, do_remove, |
| prev_src_offset, src_offset); |
| new_dst = ProcessExtentBlockRange(dst_extents, &dst_idx, do_remove, |
| prev_dst_offset, dst_offset); |
| if (do_remove) |
| removed_bytes += min_num_blocks * kBlockSize; |
| } |
| |
| // If we removed the last block and this block is only partly used by file |
| // content, deduct the unused portion from the total removed byte count. |
| if (do_remove && (nonfull_block_bytes = total_bytes % kBlockSize)) |
| removed_bytes -= kBlockSize - nonfull_block_bytes; |
| |
| return removed_bytes; |
| } |
| |
| } // namespace |
| |
| bool DeltaDiffGenerator::DeltaReadFiles(Graph* graph, |
| vector<Block>* blocks, |
| const string& old_root, |
| const string& new_root, |
| off_t chunk_size, |
| int data_fd, |
| off_t* data_file_size, |
| bool src_ops_allowed) { |
| set<ino_t> visited_inodes; |
| set<ino_t> visited_src_inodes; |
| for (FilesystemIterator fs_iter(new_root, |
| set<string>{"/lost+found"}); |
| !fs_iter.IsEnd(); fs_iter.Increment()) { |
| // We never diff symlinks (here, we check that dst file is not a symlink). |
| if (!S_ISREG(fs_iter.GetStat().st_mode)) |
| continue; |
| |
| // Make sure we visit each inode only once. |
| if (utils::SetContainsKey(visited_inodes, fs_iter.GetStat().st_ino)) |
| continue; |
| visited_inodes.insert(fs_iter.GetStat().st_ino); |
| off_t dst_size = fs_iter.GetFileSize(); |
| if (dst_size == 0) |
| continue; |
| |
| LOG(INFO) << "Encoding file " << fs_iter.GetPartialPath(); |
| |
| // We can't visit each dst image inode more than once, as that would |
| // duplicate work. Here, we avoid visiting each source image inode |
| // more than once. Technically, we could have multiple operations |
| // that read the same blocks from the source image for diffing, but |
| // we choose not to avoid complexity. Eventually we will move away |
| // from using a graph/cycle detection/etc to generate diffs, and at that |
| // time, it will be easy (non-complex) to have many operations read |
| // from the same source blocks. At that time, this code can die. -adlr |
| bool should_diff_from_source = false; |
| string src_path = old_root + fs_iter.GetPartialPath(); |
| struct stat src_stbuf; |
| // We never diff symlinks (here, we check that src file is not a symlink). |
| if (0 == lstat(src_path.c_str(), &src_stbuf) && |
| S_ISREG(src_stbuf.st_mode)) { |
| should_diff_from_source = !utils::SetContainsKey(visited_src_inodes, |
| src_stbuf.st_ino); |
| visited_src_inodes.insert(src_stbuf.st_ino); |
| } |
| |
| off_t size = chunk_size == -1 ? dst_size : chunk_size; |
| off_t step = size; |
| for (off_t offset = 0; offset < dst_size; offset += step) { |
| if (offset + size >= dst_size) { |
| size = -1; // Read through the end of the file. |
| } |
| TEST_AND_RETURN_FALSE(DeltaDiffGenerator::DeltaReadFile( |
| graph, |
| Vertex::kInvalidIndex, |
| blocks, |
| (should_diff_from_source ? old_root : kEmptyPath), |
| new_root, |
| fs_iter.GetPartialPath(), |
| offset, |
| size, |
| data_fd, |
| data_file_size, |
| src_ops_allowed)); |
| } |
| } |
| return true; |
| } |
| |
| bool DeltaDiffGenerator::DeltaReadFile(Graph* graph, |
| Vertex::Index existing_vertex, |
| vector<Block>* blocks, |
| const string& old_root, |
| const string& new_root, |
| const string& path, // within new_root |
| off_t chunk_offset, |
| off_t chunk_size, |
| int data_fd, |
| off_t* data_file_size, |
| bool src_ops_allowed) { |
| chromeos::Blob data; |
| DeltaArchiveManifest_InstallOperation operation; |
| |
| string old_path = (old_root == kEmptyPath) ? kEmptyPath : |
| old_root + path; |
| |
| // If bsdiff breaks again, blacklist the problem file by using: |
| // bsdiff_allowed = (path != "/foo/bar") |
| // |
| // TODO(dgarrett): chromium-os:15274 connect this test to the command line. |
| bool bsdiff_allowed = true; |
| |
| if (utils::FileSize(new_root + path) > kMaxBsdiffDestinationSize) |
| bsdiff_allowed = false; |
| |
| if (!bsdiff_allowed) |
| LOG(INFO) << "bsdiff blacklisting: " << path; |
| |
| TEST_AND_RETURN_FALSE(DeltaDiffGenerator::ReadFileToDiff(old_path, |
| new_root + path, |
| chunk_offset, |
| chunk_size, |
| bsdiff_allowed, |
| &data, |
| &operation, |
| true, |
| src_ops_allowed)); |
| |
| // Check if the operation writes nothing. |
| if (operation.dst_extents_size() == 0) { |
| if (operation.type() == DeltaArchiveManifest_InstallOperation_Type_MOVE) { |
| LOG(INFO) << "Empty MOVE operation (" |
| << new_root + path << "), skipping"; |
| return true; |
| } else { |
| LOG(ERROR) << "Empty non-MOVE operation"; |
| return false; |
| } |
| } |
| |
| // Write the data |
| if (operation.type() != DeltaArchiveManifest_InstallOperation_Type_MOVE && |
| operation.type() != |
| DeltaArchiveManifest_InstallOperation_Type_SOURCE_COPY) { |
| operation.set_data_offset(*data_file_size); |
| operation.set_data_length(data.size()); |
| } |
| |
| TEST_AND_RETURN_FALSE(utils::WriteAll(data_fd, data.data(), data.size())); |
| *data_file_size += data.size(); |
| |
| // Now, insert into graph and blocks vector |
| Vertex::Index vertex = existing_vertex; |
| if (vertex == Vertex::kInvalidIndex) { |
| graph->emplace_back(); |
| vertex = graph->size() - 1; |
| } |
| (*graph)[vertex].op = operation; |
| CHECK((*graph)[vertex].op.has_type()); |
| (*graph)[vertex].file_name = path; |
| (*graph)[vertex].chunk_offset = chunk_offset; |
| (*graph)[vertex].chunk_size = chunk_size; |
| |
| if (blocks) |
| TEST_AND_RETURN_FALSE(InplaceGenerator::AddInstallOpToBlocksVector( |
| (*graph)[vertex].op, |
| *graph, |
| vertex, |
| blocks)); |
| return true; |
| } |
| |
| bool DeltaDiffGenerator::ReadFileToDiff( |
| const string& old_filename, |
| const string& new_filename, |
| off_t chunk_offset, |
| off_t chunk_size, |
| bool bsdiff_allowed, |
| chromeos::Blob* out_data, |
| DeltaArchiveManifest_InstallOperation* out_op, |
| bool gather_extents, |
| bool src_ops_allowed) { |
| // Read new data in |
| chromeos::Blob new_data; |
| TEST_AND_RETURN_FALSE( |
| utils::ReadFileChunk(new_filename, chunk_offset, chunk_size, &new_data)); |
| |
| TEST_AND_RETURN_FALSE(!new_data.empty()); |
| TEST_AND_RETURN_FALSE(chunk_size == -1 || |
| static_cast<off_t>(new_data.size()) <= chunk_size); |
| |
| chromeos::Blob new_data_bz; |
| TEST_AND_RETURN_FALSE(BzipCompress(new_data, &new_data_bz)); |
| CHECK(!new_data_bz.empty()); |
| |
| chromeos::Blob data; // Data blob that will be written to delta file. |
| |
| DeltaArchiveManifest_InstallOperation operation; |
| size_t current_best_size = 0; |
| if (new_data.size() <= new_data_bz.size()) { |
| operation.set_type(DeltaArchiveManifest_InstallOperation_Type_REPLACE); |
| current_best_size = new_data.size(); |
| data = new_data; |
| } else { |
| operation.set_type(DeltaArchiveManifest_InstallOperation_Type_REPLACE_BZ); |
| current_best_size = new_data_bz.size(); |
| data = new_data_bz; |
| } |
| |
| // Do we have an original file to consider? |
| off_t old_size = 0; |
| bool original = !old_filename.empty(); |
| if (original && (old_size = utils::FileSize(old_filename)) < 0) { |
| // If stat-ing the old file fails, it should be because it doesn't exist. |
| TEST_AND_RETURN_FALSE(!utils::FileExists(old_filename.c_str())); |
| original = false; |
| } |
| |
| chromeos::Blob old_data; |
| if (original) { |
| // Read old data |
| TEST_AND_RETURN_FALSE( |
| utils::ReadFileChunk( |
| old_filename, chunk_offset, chunk_size, &old_data)); |
| if (old_data == new_data) { |
| // No change in data. |
| if (src_ops_allowed) { |
| operation.set_type( |
| DeltaArchiveManifest_InstallOperation_Type_SOURCE_COPY); |
| } else { |
| operation.set_type(DeltaArchiveManifest_InstallOperation_Type_MOVE); |
| } |
| current_best_size = 0; |
| data.clear(); |
| } else if (!old_data.empty() && bsdiff_allowed) { |
| // If the source file is considered bsdiff safe (no bsdiff bugs |
| // triggered), see if BSDIFF encoding is smaller. |
| base::FilePath old_chunk; |
| TEST_AND_RETURN_FALSE(base::CreateTemporaryFile(&old_chunk)); |
| ScopedPathUnlinker old_unlinker(old_chunk.value()); |
| TEST_AND_RETURN_FALSE( |
| utils::WriteFile(old_chunk.value().c_str(), |
| old_data.data(), old_data.size())); |
| base::FilePath new_chunk; |
| TEST_AND_RETURN_FALSE(base::CreateTemporaryFile(&new_chunk)); |
| ScopedPathUnlinker new_unlinker(new_chunk.value()); |
| TEST_AND_RETURN_FALSE( |
| utils::WriteFile(new_chunk.value().c_str(), |
| new_data.data(), new_data.size())); |
| |
| chromeos::Blob bsdiff_delta; |
| TEST_AND_RETURN_FALSE( |
| BsdiffFiles(old_chunk.value(), new_chunk.value(), &bsdiff_delta)); |
| CHECK_GT(bsdiff_delta.size(), static_cast<chromeos::Blob::size_type>(0)); |
| if (bsdiff_delta.size() < current_best_size) { |
| if (src_ops_allowed) { |
| operation.set_type( |
| DeltaArchiveManifest_InstallOperation_Type_SOURCE_BSDIFF); |
| } else { |
| operation.set_type(DeltaArchiveManifest_InstallOperation_Type_BSDIFF); |
| } |
| current_best_size = bsdiff_delta.size(); |
| data = bsdiff_delta; |
| } |
| } |
| } |
| |
| // Set parameters of the operations |
| CHECK_EQ(data.size(), current_best_size); |
| |
| vector<Extent> src_extents, dst_extents; |
| if (operation.type() == DeltaArchiveManifest_InstallOperation_Type_MOVE || |
| operation.type() == DeltaArchiveManifest_InstallOperation_Type_BSDIFF || |
| operation.type() == |
| DeltaArchiveManifest_InstallOperation_Type_SOURCE_COPY || |
| operation.type() == |
| DeltaArchiveManifest_InstallOperation_Type_SOURCE_BSDIFF) { |
| if (gather_extents) { |
| TEST_AND_RETURN_FALSE( |
| GatherExtents(old_filename, |
| chunk_offset, |
| chunk_size, |
| &src_extents)); |
| } else { |
| Extent* src_extent = operation.add_src_extents(); |
| src_extent->set_start_block(0); |
| src_extent->set_num_blocks((old_size + kBlockSize - 1) / kBlockSize); |
| } |
| operation.set_src_length(old_data.size()); |
| } |
| |
| if (gather_extents) { |
| TEST_AND_RETURN_FALSE( |
| GatherExtents(new_filename, |
| chunk_offset, |
| chunk_size, |
| &dst_extents)); |
| } else { |
| Extent* dst_extent = operation.add_dst_extents(); |
| dst_extent->set_start_block(0); |
| dst_extent->set_num_blocks((new_data.size() + kBlockSize - 1) / kBlockSize); |
| } |
| operation.set_dst_length(new_data.size()); |
| |
| if (gather_extents) { |
| // Remove identical src/dst block ranges in MOVE operations. |
| if (operation.type() == DeltaArchiveManifest_InstallOperation_Type_MOVE) { |
| size_t removed_bytes = RemoveIdenticalBlockRanges( |
| &src_extents, &dst_extents, new_data.size()); |
| |
| // Adjust the file length field accordingly. |
| if (removed_bytes) { |
| operation.set_src_length(old_data.size() - removed_bytes); |
| operation.set_dst_length(new_data.size() - removed_bytes); |
| } |
| } |
| |
| // Embed extents in the operation. |
| StoreExtents(src_extents, operation.mutable_src_extents()); |
| StoreExtents(dst_extents, operation.mutable_dst_extents()); |
| } |
| |
| out_data->swap(data); |
| *out_op = operation; |
| |
| return true; |
| } |
| |
| bool DeltaDiffGenerator::DeltaCompressKernelPartition( |
| const string& old_kernel_part, |
| const string& new_kernel_part, |
| vector<AnnotatedOperation>* kernel_ops, |
| int blobs_fd, |
| off_t* blobs_length, |
| bool src_ops_allowed) { |
| LOG(INFO) << "Delta compressing kernel partition..."; |
| LOG_IF(INFO, old_kernel_part.empty()) << "Generating full kernel update..."; |
| |
| DeltaArchiveManifest_InstallOperation op; |
| chromeos::Blob data; |
| TEST_AND_RETURN_FALSE( |
| ReadFileToDiff(old_kernel_part, |
| new_kernel_part, |
| 0, // chunk_offset |
| -1, // chunk_size |
| true, // bsdiff_allowed |
| &data, |
| &op, |
| false, |
| src_ops_allowed)); |
| |
| // Check if the operation writes nothing. |
| if (op.dst_extents_size() == 0) { |
| if (op.type() == DeltaArchiveManifest_InstallOperation_Type_MOVE) { |
| LOG(INFO) << "Empty MOVE operation, nothing to do."; |
| return true; |
| } else { |
| LOG(ERROR) << "Empty non-MOVE operation"; |
| return false; |
| } |
| } |
| |
| // Write the data. |
| if (op.type() != DeltaArchiveManifest_InstallOperation_Type_MOVE && |
| op.type() != DeltaArchiveManifest_InstallOperation_Type_SOURCE_COPY) { |
| op.set_data_offset(*blobs_length); |
| op.set_data_length(data.size()); |
| } |
| |
| // Add the new install operation. |
| kernel_ops->clear(); |
| kernel_ops->emplace_back(); |
| kernel_ops->back().op = op; |
| kernel_ops->back().name = "<kernel-delta-operation>"; |
| |
| TEST_AND_RETURN_FALSE(utils::WriteAll(blobs_fd, data.data(), data.size())); |
| *blobs_length += data.size(); |
| |
| LOG(INFO) << "Done delta compressing kernel partition: " |
| << kInstallOperationTypes[op.type()]; |
| return true; |
| } |
| |
| // TODO(deymo): Replace Vertex with AnnotatedOperation. This requires to move |
| // out the code that adds the reader dependencies on the new vertex. |
| bool DeltaDiffGenerator::ReadUnwrittenBlocks( |
| const vector<Block>& blocks, |
| int blobs_fd, |
| off_t* blobs_length, |
| const string& old_image_path, |
| const string& new_image_path, |
| Vertex* vertex) { |
| vertex->file_name = "<rootfs-non-file-data>"; |
| |
| DeltaArchiveManifest_InstallOperation* out_op = &vertex->op; |
| int new_image_fd = open(new_image_path.c_str(), O_RDONLY, 000); |
| TEST_AND_RETURN_FALSE_ERRNO(new_image_fd >= 0); |
| ScopedFdCloser new_image_fd_closer(&new_image_fd); |
| int old_image_fd = open(old_image_path.c_str(), O_RDONLY, 000); |
| TEST_AND_RETURN_FALSE_ERRNO(old_image_fd >= 0); |
| ScopedFdCloser old_image_fd_closer(&old_image_fd); |
| |
| string temp_file_path; |
| TEST_AND_RETURN_FALSE(utils::MakeTempFile("CrAU_temp_data.XXXXXX", |
| &temp_file_path, |
| nullptr)); |
| |
| FILE* file = fopen(temp_file_path.c_str(), "w"); |
| TEST_AND_RETURN_FALSE(file); |
| int err = BZ_OK; |
| |
| BZFILE* bz_file = BZ2_bzWriteOpen(&err, |
| file, |
| 9, // max compression |
| 0, // verbosity |
| 0); // default work factor |
| TEST_AND_RETURN_FALSE(err == BZ_OK); |
| |
| vector<Extent> extents; |
| vector<Block>::size_type block_count = 0; |
| |
| LOG(INFO) << "Appending unwritten blocks to extents"; |
| for (vector<Block>::size_type i = 0; i < blocks.size(); i++) { |
| if (blocks[i].writer != Vertex::kInvalidIndex) |
| continue; |
| graph_utils::AppendBlockToExtents(&extents, i); |
| block_count++; |
| } |
| |
| // Code will handle buffers of any size that's a multiple of kBlockSize, |
| // so we arbitrarily set it to 1024 * kBlockSize. |
| chromeos::Blob new_buf(1024 * kBlockSize); |
| chromeos::Blob old_buf(1024 * kBlockSize); |
| |
| LOG(INFO) << "Scanning " << block_count << " unwritten blocks"; |
| vector<Extent> changed_extents; |
| vector<Block>::size_type changed_block_count = 0; |
| vector<Block>::size_type blocks_copied_count = 0; |
| |
| // For each extent in extents, write the unchanged blocks into BZ2_bzWrite, |
| // which sends it to an output file. We use the temporary buffers to hold the |
| // old and new data, which may be smaller than the extent, so in that case we |
| // have to loop to get the extent's data (that's the inner while loop). |
| for (const Extent& extent : extents) { |
| vector<Block>::size_type blocks_read = 0; |
| float printed_progress = -1; |
| while (blocks_read < extent.num_blocks()) { |
| const uint64_t copy_first_block = extent.start_block() + blocks_read; |
| const int copy_block_cnt = |
| min(new_buf.size() / kBlockSize, |
| static_cast<chromeos::Blob::size_type>( |
| extent.num_blocks() - blocks_read)); |
| const size_t count = copy_block_cnt * kBlockSize; |
| const off_t offset = copy_first_block * kBlockSize; |
| ssize_t rc = pread(new_image_fd, new_buf.data(), count, offset); |
| TEST_AND_RETURN_FALSE_ERRNO(rc >= 0); |
| TEST_AND_RETURN_FALSE(static_cast<size_t>(rc) == count); |
| |
| rc = pread(old_image_fd, old_buf.data(), count, offset); |
| TEST_AND_RETURN_FALSE_ERRNO(rc >= 0); |
| TEST_AND_RETURN_FALSE(static_cast<size_t>(rc) == count); |
| |
| // Compare each block in the buffer to its counterpart in the old image |
| // and only compress it if its content has changed. |
| int buf_offset = 0; |
| for (int i = 0; i < copy_block_cnt; ++i) { |
| int buf_end_offset = buf_offset + kBlockSize; |
| if (!std::equal(new_buf.begin() + buf_offset, |
| new_buf.begin() + buf_end_offset, |
| old_buf.begin() + buf_offset)) { |
| BZ2_bzWrite(&err, bz_file, &new_buf[buf_offset], kBlockSize); |
| TEST_AND_RETURN_FALSE(err == BZ_OK); |
| const uint64_t block_idx = copy_first_block + i; |
| if (blocks[block_idx].reader != Vertex::kInvalidIndex) { |
| graph_utils::AddReadBeforeDep(vertex, blocks[block_idx].reader, |
| block_idx); |
| } |
| graph_utils::AppendBlockToExtents(&changed_extents, block_idx); |
| changed_block_count++; |
| } |
| buf_offset = buf_end_offset; |
| } |
| |
| blocks_read += copy_block_cnt; |
| blocks_copied_count += copy_block_cnt; |
| float current_progress = |
| static_cast<float>(blocks_copied_count) / block_count; |
| if (printed_progress + 0.1 < current_progress || |
| blocks_copied_count == block_count) { |
| LOG(INFO) << "progress: " << current_progress; |
| printed_progress = current_progress; |
| } |
| } |
| } |
| BZ2_bzWriteClose(&err, bz_file, 0, nullptr, nullptr); |
| TEST_AND_RETURN_FALSE(err == BZ_OK); |
| bz_file = nullptr; |
| TEST_AND_RETURN_FALSE_ERRNO(0 == fclose(file)); |
| file = nullptr; |
| |
| LOG(INFO) << "Compressed " << changed_block_count << " blocks (" |
| << block_count - changed_block_count << " blocks unchanged)"; |
| chromeos::Blob compressed_data; |
| if (changed_block_count > 0) { |
| LOG(INFO) << "Reading compressed data off disk"; |
| TEST_AND_RETURN_FALSE(utils::ReadFile(temp_file_path, &compressed_data)); |
| } |
| TEST_AND_RETURN_FALSE(unlink(temp_file_path.c_str()) == 0); |
| |
| // Add node to graph to write these blocks |
| out_op->set_type(DeltaArchiveManifest_InstallOperation_Type_REPLACE_BZ); |
| out_op->set_data_offset(*blobs_length); |
| out_op->set_data_length(compressed_data.size()); |
| LOG(INFO) << "Rootfs non-data blocks compressed take up " |
| << compressed_data.size(); |
| *blobs_length += compressed_data.size(); |
| out_op->set_dst_length(kBlockSize * changed_block_count); |
| DeltaDiffGenerator::StoreExtents(changed_extents, |
| out_op->mutable_dst_extents()); |
| |
| TEST_AND_RETURN_FALSE(utils::WriteAll(blobs_fd, |
| compressed_data.data(), |
| compressed_data.size())); |
| LOG(INFO) << "Done processing unwritten blocks"; |
| return true; |
| } |
| |
| bool DeltaDiffGenerator::InitializePartitionInfo(bool is_kernel, |
| const string& partition, |
| PartitionInfo* info) { |
| int64_t size = 0; |
| if (is_kernel) { |
| size = utils::FileSize(partition); |
| } else { |
| int block_count = 0, block_size = 0; |
| TEST_AND_RETURN_FALSE(utils::GetFilesystemSize(partition, |
| &block_count, |
| &block_size)); |
| size = static_cast<int64_t>(block_count) * block_size; |
| } |
| TEST_AND_RETURN_FALSE(size > 0); |
| info->set_size(size); |
| OmahaHashCalculator hasher; |
| TEST_AND_RETURN_FALSE(hasher.UpdateFile(partition, size) == size); |
| TEST_AND_RETURN_FALSE(hasher.Finalize()); |
| const chromeos::Blob& hash = hasher.raw_hash(); |
| info->set_hash(hash.data(), hash.size()); |
| LOG(INFO) << partition << ": size=" << size << " hash=" << hasher.hash(); |
| return true; |
| } |
| |
| bool InitializePartitionInfos(const PayloadGenerationConfig& config, |
| DeltaArchiveManifest* manifest) { |
| if (!config.source.kernel_part.empty()) { |
| TEST_AND_RETURN_FALSE(DeltaDiffGenerator::InitializePartitionInfo( |
| true, |
| config.source.kernel_part, |
| manifest->mutable_old_kernel_info())); |
| } |
| TEST_AND_RETURN_FALSE(DeltaDiffGenerator::InitializePartitionInfo( |
| true, |
| config.target.kernel_part, |
| manifest->mutable_new_kernel_info())); |
| if (!config.source.rootfs_part.empty()) { |
| TEST_AND_RETURN_FALSE(DeltaDiffGenerator::InitializePartitionInfo( |
| false, |
| config.source.rootfs_part, |
| manifest->mutable_old_rootfs_info())); |
| } |
| TEST_AND_RETURN_FALSE(DeltaDiffGenerator::InitializePartitionInfo( |
| false, |
| config.target.rootfs_part, |
| manifest->mutable_new_rootfs_info())); |
| return true; |
| } |
| |
| // Stores all Extents in 'extents' into 'out'. |
| void DeltaDiffGenerator::StoreExtents( |
| const vector<Extent>& extents, |
| google::protobuf::RepeatedPtrField<Extent>* out) { |
| for (const Extent& extent : extents) { |
| Extent* new_extent = out->Add(); |
| *new_extent = extent; |
| } |
| } |
| |
| // Returns true if |op| is a no-op operation that doesn't do any useful work |
| // (e.g., a move operation that copies blocks onto themselves). |
| bool DeltaDiffGenerator::IsNoopOperation( |
| const DeltaArchiveManifest_InstallOperation& op) { |
| return (op.type() == DeltaArchiveManifest_InstallOperation_Type_MOVE && |
| ExpandExtents(op.src_extents()) == ExpandExtents(op.dst_extents())); |
| } |
| |
| void DeltaDiffGenerator::FilterNoopOperations(vector<AnnotatedOperation>* ops) { |
| ops->erase( |
| std::remove_if( |
| ops->begin(), ops->end(), |
| [](const AnnotatedOperation& aop){return IsNoopOperation(aop.op);}), |
| ops->end()); |
| } |
| |
| bool DeltaDiffGenerator::ReorderDataBlobs( |
| DeltaArchiveManifest* manifest, |
| const string& data_blobs_path, |
| const string& new_data_blobs_path) { |
| int in_fd = open(data_blobs_path.c_str(), O_RDONLY, 0); |
| TEST_AND_RETURN_FALSE_ERRNO(in_fd >= 0); |
| ScopedFdCloser in_fd_closer(&in_fd); |
| |
| DirectFileWriter writer; |
| TEST_AND_RETURN_FALSE( |
| writer.Open(new_data_blobs_path.c_str(), |
| O_WRONLY | O_TRUNC | O_CREAT, |
| 0644) == 0); |
| ScopedFileWriterCloser writer_closer(&writer); |
| uint64_t out_file_size = 0; |
| |
| for (int i = 0; i < (manifest->install_operations_size() + |
| manifest->kernel_install_operations_size()); i++) { |
| DeltaArchiveManifest_InstallOperation* op = nullptr; |
| if (i < manifest->install_operations_size()) { |
| op = manifest->mutable_install_operations(i); |
| } else { |
| op = manifest->mutable_kernel_install_operations( |
| i - manifest->install_operations_size()); |
| } |
| if (!op->has_data_offset()) |
| continue; |
| CHECK(op->has_data_length()); |
| chromeos::Blob buf(op->data_length()); |
| ssize_t rc = pread(in_fd, buf.data(), buf.size(), op->data_offset()); |
| TEST_AND_RETURN_FALSE(rc == static_cast<ssize_t>(buf.size())); |
| |
| // Add the hash of the data blobs for this operation |
| TEST_AND_RETURN_FALSE(AddOperationHash(op, buf)); |
| |
| op->set_data_offset(out_file_size); |
| TEST_AND_RETURN_FALSE(writer.Write(buf.data(), buf.size())); |
| out_file_size += buf.size(); |
| } |
| return true; |
| } |
| |
| bool DeltaDiffGenerator::AddOperationHash( |
| DeltaArchiveManifest_InstallOperation* op, |
| const chromeos::Blob& buf) { |
| OmahaHashCalculator hasher; |
| |
| TEST_AND_RETURN_FALSE(hasher.Update(buf.data(), buf.size())); |
| TEST_AND_RETURN_FALSE(hasher.Finalize()); |
| |
| const chromeos::Blob& hash = hasher.raw_hash(); |
| op->set_data_sha256_hash(hash.data(), hash.size()); |
| return true; |
| } |
| |
| bool DeltaDiffGenerator::GenerateOperations( |
| const PayloadGenerationConfig& config, |
| int data_file_fd, |
| off_t* data_file_size, |
| vector<AnnotatedOperation>* rootfs_ops, |
| vector<AnnotatedOperation>* kernel_ops) { |
| // List of blocks in the target partition, with the operation that needs to |
| // write it and the operation that needs to read it. This is used here to |
| // keep track of the blocks that no operation is writting it. |
| vector<Block> blocks(config.target.rootfs_size / config.block_size); |
| |
| // TODO(deymo): DeltaReadFiles() should not use a graph to generate the |
| // operations, either in the in-place or source uprate. Split out the |
| // graph dependency generation. |
| Graph graph; |
| TEST_AND_RETURN_FALSE(DeltaReadFiles(&graph, |
| &blocks, |
| config.source.rootfs_mountpt, |
| config.target.rootfs_mountpt, |
| config.chunk_size, |
| data_file_fd, |
| data_file_size, |
| true)); // src_ops_allowed |
| rootfs_ops->clear(); |
| for (const Vertex& v : graph) { |
| rootfs_ops->emplace_back(); |
| AnnotatedOperation& aop = rootfs_ops->back(); |
| aop.op = v.op; |
| aop.SetNameFromFileAndChunk(v.file_name, v.chunk_offset, v.chunk_size); |
| } |
| |
| LOG(INFO) << "done reading normal files"; |
| |
| // Read kernel partition |
| TEST_AND_RETURN_FALSE( |
| DeltaCompressKernelPartition(config.source.kernel_part, |
| config.target.kernel_part, |
| kernel_ops, |
| data_file_fd, |
| data_file_size, |
| true)); // src_ops_allowed |
| LOG(INFO) << "done reading kernel"; |
| |
| Vertex unwritten_vertex; |
| TEST_AND_RETURN_FALSE(ReadUnwrittenBlocks(blocks, |
| data_file_fd, |
| data_file_size, |
| config.source.rootfs_part, |
| config.target.rootfs_part, |
| &unwritten_vertex)); |
| if (unwritten_vertex.op.data_length() == 0) { |
| LOG(INFO) << "No unwritten blocks to write, omitting operation"; |
| } else { |
| rootfs_ops->emplace_back(); |
| rootfs_ops->back().op = unwritten_vertex.op; |
| rootfs_ops->back().name = unwritten_vertex.file_name; |
| } |
| return true; |
| } |
| |
| bool GenerateUpdatePayloadFile( |
| const PayloadGenerationConfig& config, |
| const string& output_path, |
| const string& private_key_path, |
| uint64_t* metadata_size) { |
| if (config.is_delta) { |
| LOG_IF(WARNING, config.source.rootfs_size != config.target.rootfs_size) |
| << "Old and new images have different block counts."; |
| // TODO(deymo): Our tools only support growing the filesystem size during |
| // an update. Remove this check when that's fixed. crbug.com/192136 |
| LOG_IF(FATAL, config.source.rootfs_size > config.target.rootfs_size) |
| << "Shirking the rootfs size is not supported at the moment."; |
| } |
| |
| // Sanity checks for the partition size. |
| LOG(INFO) << "Rootfs partition size: " << config.rootfs_partition_size; |
| LOG(INFO) << "Actual filesystem size: " << config.target.rootfs_size; |
| |
| LOG(INFO) << "Invalid block index: " << Vertex::kInvalidIndex; |
| LOG(INFO) << "Block count: " |
| << config.target.rootfs_size / config.block_size; |
| |
| const string kTempFileTemplate("CrAU_temp_data.XXXXXX"); |
| string temp_file_path; |
| unique_ptr<ScopedPathUnlinker> temp_file_unlinker; |
| off_t data_file_size = 0; |
| |
| LOG(INFO) << "Reading files..."; |
| |
| // Create empty protobuf Manifest object |
| DeltaArchiveManifest manifest; |
| manifest.set_minor_version(config.minor_version); |
| |
| vector<AnnotatedOperation> rootfs_ops; |
| vector<AnnotatedOperation> kernel_ops; |
| |
| // Select payload generation strategy based on the config. |
| unique_ptr<OperationsGenerator> strategy; |
| if (config.is_delta) { |
| // We don't efficiently support deltas on squashfs. For now, we will |
| // produce full operations in that case. |
| if (utils::IsSquashfsFilesystem(config.target.rootfs_part)) { |
| LOG(INFO) << "Using generator FullUpdateGenerator::Run for squashfs " |
| "deltas"; |
| strategy.reset(new FullUpdateGenerator()); |
| } else if (utils::IsExtFilesystem(config.target.rootfs_part)) { |
| // Delta update (with possibly a full kernel update). |
| if (config.minor_version == kInPlaceMinorPayloadVersion) { |
| LOG(INFO) << "Using generator InplaceGenerator::GenerateInplaceDelta"; |
| strategy.reset(new InplaceGenerator()); |
| } else if (config.minor_version == kSourceMinorPayloadVersion) { |
| LOG(INFO) << "Using generator DeltaDiffGenerator::GenerateSourceDelta"; |
| strategy.reset(new DeltaDiffGenerator()); |
| } else { |
| LOG(ERROR) << "Unsupported minor version given for delta payload: " |
| << config.minor_version; |
| return false; |
| } |
| } else { |
| LOG(ERROR) << "Unsupported filesystem for delta payload in " |
| << config.target.rootfs_part; |
| return false; |
| } |
| } else { |
| // Full update. |
| LOG(INFO) << "Using generator FullUpdateGenerator::Run"; |
| strategy.reset(new FullUpdateGenerator()); |
| } |
| |
| { |
| int data_file_fd; |
| TEST_AND_RETURN_FALSE( |
| utils::MakeTempFile(kTempFileTemplate, &temp_file_path, &data_file_fd)); |
| temp_file_unlinker.reset(new ScopedPathUnlinker(temp_file_path)); |
| TEST_AND_RETURN_FALSE(data_file_fd >= 0); |
| ScopedFdCloser data_file_fd_closer(&data_file_fd); |
| |
| // Generate the operations using the strategy we selected above. |
| TEST_AND_RETURN_FALSE(strategy->GenerateOperations(config, |
| data_file_fd, |
| &data_file_size, |
| &rootfs_ops, |
| &kernel_ops)); |
| } |
| |
| if (!config.source.ImageInfoIsEmpty()) |
| *(manifest.mutable_old_image_info()) = config.source.image_info; |
| |
| if (!config.target.ImageInfoIsEmpty()) |
| *(manifest.mutable_new_image_info()) = config.target.image_info; |
| |
| // Filter the no-operations. OperationsGenerators should not output this kind |
| // of operations normally, but this is an extra step to fix that if |
| // happened. |
| DeltaDiffGenerator::FilterNoopOperations(&rootfs_ops); |
| DeltaDiffGenerator::FilterNoopOperations(&kernel_ops); |
| |
| OperationNameMap op_name_map; |
| InstallOperationsToManifest(rootfs_ops, kernel_ops, &manifest, &op_name_map); |
| manifest.set_block_size(config.block_size); |
| |
| // Reorder the data blobs with the newly ordered manifest. |
| string ordered_blobs_path; |
| TEST_AND_RETURN_FALSE(utils::MakeTempFile( |
| "CrAU_temp_data.ordered.XXXXXX", |
| &ordered_blobs_path, |
| nullptr)); |
| ScopedPathUnlinker ordered_blobs_unlinker(ordered_blobs_path); |
| TEST_AND_RETURN_FALSE( |
| DeltaDiffGenerator::ReorderDataBlobs(&manifest, |
| temp_file_path, |
| ordered_blobs_path)); |
| temp_file_unlinker.reset(); |
| |
| // Check that install op blobs are in order. |
| uint64_t next_blob_offset = 0; |
| { |
| for (int i = 0; i < (manifest.install_operations_size() + |
| manifest.kernel_install_operations_size()); i++) { |
| DeltaArchiveManifest_InstallOperation* op = |
| i < manifest.install_operations_size() ? |
| manifest.mutable_install_operations(i) : |
| manifest.mutable_kernel_install_operations( |
| i - manifest.install_operations_size()); |
| if (op->has_data_offset()) { |
| if (op->data_offset() != next_blob_offset) { |
| LOG(FATAL) << "bad blob offset! " << op->data_offset() << " != " |
| << next_blob_offset; |
| } |
| next_blob_offset += op->data_length(); |
| } |
| } |
| } |
| |
| // Signatures appear at the end of the blobs. Note the offset in the |
| // manifest |
| if (!private_key_path.empty()) { |
| uint64_t signature_blob_length = 0; |
| TEST_AND_RETURN_FALSE( |
| PayloadSigner::SignatureBlobLength(vector<string>(1, private_key_path), |
| &signature_blob_length)); |
| DeltaDiffGenerator::AddSignatureOp( |
| next_blob_offset, signature_blob_length, &manifest); |
| } |
| |
| TEST_AND_RETURN_FALSE(InitializePartitionInfos(config, &manifest)); |
| |
| // Serialize protobuf |
| string serialized_manifest; |
| |
| TEST_AND_RETURN_FALSE(manifest.AppendToString(&serialized_manifest)); |
| |
| LOG(INFO) << "Writing final delta file header..."; |
| DirectFileWriter writer; |
| TEST_AND_RETURN_FALSE_ERRNO(writer.Open(output_path.c_str(), |
| O_WRONLY | O_CREAT | O_TRUNC, |
| 0644) == 0); |
| ScopedFileWriterCloser writer_closer(&writer); |
| |
| // Write header |
| TEST_AND_RETURN_FALSE(writer.Write(kDeltaMagic, strlen(kDeltaMagic))); |
| |
| // Write major version number |
| TEST_AND_RETURN_FALSE(WriteUint64AsBigEndian(&writer, kMajorVersionNumber)); |
| |
| // Write protobuf length |
| TEST_AND_RETURN_FALSE(WriteUint64AsBigEndian(&writer, |
| serialized_manifest.size())); |
| |
| // Write protobuf |
| LOG(INFO) << "Writing final delta file protobuf... " |
| << serialized_manifest.size(); |
| TEST_AND_RETURN_FALSE(writer.Write(serialized_manifest.data(), |
| serialized_manifest.size())); |
| |
| // Append the data blobs |
| LOG(INFO) << "Writing final delta file data blobs..."; |
| int blobs_fd = open(ordered_blobs_path.c_str(), O_RDONLY, 0); |
| ScopedFdCloser blobs_fd_closer(&blobs_fd); |
| TEST_AND_RETURN_FALSE(blobs_fd >= 0); |
| for (;;) { |
| vector<char> buf(config.block_size); |
| ssize_t rc = read(blobs_fd, buf.data(), buf.size()); |
| if (0 == rc) { |
| // EOF |
| break; |
| } |
| TEST_AND_RETURN_FALSE_ERRNO(rc > 0); |
| TEST_AND_RETURN_FALSE(writer.Write(buf.data(), rc)); |
| } |
| |
| // Write signature blob. |
| if (!private_key_path.empty()) { |
| LOG(INFO) << "Signing the update..."; |
| chromeos::Blob signature_blob; |
| TEST_AND_RETURN_FALSE(PayloadSigner::SignPayload( |
| output_path, |
| vector<string>(1, private_key_path), |
| &signature_blob)); |
| TEST_AND_RETURN_FALSE(writer.Write(signature_blob.data(), |
| signature_blob.size())); |
| } |
| |
| *metadata_size = |
| strlen(kDeltaMagic) + 2 * sizeof(uint64_t) + serialized_manifest.size(); |
| ReportPayloadUsage(manifest, *metadata_size, op_name_map); |
| |
| LOG(INFO) << "All done. Successfully created delta file with " |
| << "metadata size = " << *metadata_size; |
| return true; |
| } |
| |
| // Runs the bsdiff tool on two files and returns the resulting delta in |
| // 'out'. Returns true on success. |
| bool DeltaDiffGenerator::BsdiffFiles(const string& old_file, |
| const string& new_file, |
| chromeos::Blob* out) { |
| const string kPatchFile = "delta.patchXXXXXX"; |
| string patch_file_path; |
| |
| TEST_AND_RETURN_FALSE( |
| utils::MakeTempFile(kPatchFile, &patch_file_path, nullptr)); |
| |
| vector<string> cmd; |
| cmd.push_back(kBsdiffPath); |
| cmd.push_back(old_file); |
| cmd.push_back(new_file); |
| cmd.push_back(patch_file_path); |
| |
| int rc = 1; |
| chromeos::Blob patch_file; |
| TEST_AND_RETURN_FALSE(Subprocess::SynchronousExec(cmd, &rc, nullptr)); |
| TEST_AND_RETURN_FALSE(rc == 0); |
| TEST_AND_RETURN_FALSE(utils::ReadFile(patch_file_path, out)); |
| unlink(patch_file_path.c_str()); |
| return true; |
| } |
| |
| void DeltaDiffGenerator::AddSignatureOp(uint64_t signature_blob_offset, |
| uint64_t signature_blob_length, |
| DeltaArchiveManifest* manifest) { |
| LOG(INFO) << "Making room for signature in file"; |
| manifest->set_signatures_offset(signature_blob_offset); |
| LOG(INFO) << "set? " << manifest->has_signatures_offset(); |
| // Add a dummy op at the end to appease older clients |
| DeltaArchiveManifest_InstallOperation* dummy_op = |
| manifest->add_kernel_install_operations(); |
| dummy_op->set_type(DeltaArchiveManifest_InstallOperation_Type_REPLACE); |
| dummy_op->set_data_offset(signature_blob_offset); |
| manifest->set_signatures_offset(signature_blob_offset); |
| dummy_op->set_data_length(signature_blob_length); |
| manifest->set_signatures_size(signature_blob_length); |
| Extent* dummy_extent = dummy_op->add_dst_extents(); |
| // Tell the dummy op to write this data to a big sparse hole |
| dummy_extent->set_start_block(kSparseHole); |
| dummy_extent->set_num_blocks((signature_blob_length + kBlockSize - 1) / |
| kBlockSize); |
| } |
| |
| }; // namespace chromeos_update_engine |
