delta_diff_generator.cc revision 20bdc70e540e021c4a26553dfdbfd2fabe8ea432 
1//
2// Copyright (C) 2012 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 "update_engine/payload_generator/delta_diff_generator.h"
18
19#include <errno.h>
20#include <fcntl.h>
21#include <inttypes.h>
22#include <sys/stat.h>
23#include <sys/types.h>
24
25#include <algorithm>
26#include <memory>
27#include <string>
28#include <utility>
29#include <vector>
30
31#include <base/logging.h>
32
33#include "update_engine/common/utils.h"
34#include "update_engine/payload_consumer/delta_performer.h"
35#include "update_engine/payload_consumer/payload_constants.h"
36#include "update_engine/payload_generator/ab_generator.h"
37#include "update_engine/payload_generator/blob_file_writer.h"
38#include "update_engine/payload_generator/delta_diff_utils.h"
39#include "update_engine/payload_generator/full_update_generator.h"
40#include "update_engine/payload_generator/inplace_generator.h"
41#include "update_engine/payload_generator/payload_file.h"
42
43using std::string;
44using std::unique_ptr;
45using std::vector;
46
47namespace chromeos_update_engine {
48
49// bytes
50const size_t kRootFSPartitionSize = static_cast<size_t>(2) * 1024 * 1024 * 1024;
51const size_t kBlockSize = 4096;  // bytes
52
53bool GenerateUpdatePayloadFile(
54    const PayloadGenerationConfig& config,
55    const string& output_path,
56    const string& private_key_path,
57    uint64_t* metadata_size) {
58  if (!config.version.Validate()) {
59    LOG(ERROR) << "Unsupported major.minor version: " << config.version.major
60               << "." << config.version.minor;
61    return false;
62  }
63
64  // Create empty payload file object.
65  PayloadFile payload;
66  TEST_AND_RETURN_FALSE(payload.Init(config));
67
68  const string kTempFileTemplate("CrAU_temp_data.XXXXXX");
69  string temp_file_path;
70  int data_file_fd;
71  TEST_AND_RETURN_FALSE(
72      utils::MakeTempFile(kTempFileTemplate, &temp_file_path, &data_file_fd));
73  ScopedPathUnlinker temp_file_unlinker(temp_file_path);
74  TEST_AND_RETURN_FALSE(data_file_fd >= 0);
75
76  {
77    off_t data_file_size = 0;
78    ScopedFdCloser data_file_fd_closer(&data_file_fd);
79    BlobFileWriter blob_file(data_file_fd, &data_file_size);
80    if (config.is_delta) {
81      TEST_AND_RETURN_FALSE(config.source.partitions.size() ==
82                            config.target.partitions.size());
83    }
84    PartitionConfig empty_part("");
85    for (size_t i = 0; i < config.target.partitions.size(); i++) {
86      const PartitionConfig& old_part =
87          config.is_delta ? config.source.partitions[i] : empty_part;
88      const PartitionConfig& new_part = config.target.partitions[i];
89      LOG(INFO) << "Partition name: " << new_part.name;
90      LOG(INFO) << "Partition size: " << new_part.size;
91      LOG(INFO) << "Block count: " << new_part.size / config.block_size;
92
93      // Select payload generation strategy based on the config.
94      unique_ptr<OperationsGenerator> strategy;
95      if (!old_part.path.empty()) {
96        // Delta update.
97        if (config.version.minor == kInPlaceMinorPayloadVersion) {
98          LOG(INFO) << "Using generator InplaceGenerator().";
99          strategy.reset(new InplaceGenerator());
100        } else {
101          LOG(INFO) << "Using generator ABGenerator().";
102          strategy.reset(new ABGenerator());
103        }
104      } else {
105        LOG(INFO) << "Using generator FullUpdateGenerator().";
106        strategy.reset(new FullUpdateGenerator());
107      }
108
109      vector<AnnotatedOperation> aops;
110      // Generate the operations using the strategy we selected above.
111      TEST_AND_RETURN_FALSE(strategy->GenerateOperations(config,
112                                                         old_part,
113                                                         new_part,
114                                                         &blob_file,
115                                                         &aops));
116
117      // Filter the no-operations. OperationsGenerators should not output this
118      // kind of operations normally, but this is an extra step to fix that if
119      // happened.
120      diff_utils::FilterNoopOperations(&aops);
121
122      TEST_AND_RETURN_FALSE(payload.AddPartition(old_part, new_part, aops));
123    }
124  }
125
126  LOG(INFO) << "Writing payload file...";
127  // Write payload file to disk.
128  TEST_AND_RETURN_FALSE(payload.WritePayload(output_path, temp_file_path,
129                                             private_key_path, metadata_size));
130
131  LOG(INFO) << "All done. Successfully created delta file with "
132            << "metadata size = " << *metadata_size;
133  return true;
134}
135
136};  // namespace chromeos_update_engine
137