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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_DIFF_GENERATOR_H__ | 5 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_DIFF_GENERATOR_H__ |
6 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_DIFF_GENERATOR_H__ | 6 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_DIFF_GENERATOR_H__ |
7 | 7 |
8 #include <sys/types.h> | 8 #include <sys/types.h> |
9 #include <sys/stat.h> | 9 #include <sys/stat.h> |
| 10 #include <set> |
10 #include <string> | 11 #include <string> |
11 #include <vector> | 12 #include <vector> |
12 #include "base/basictypes.h" | 13 #include "base/basictypes.h" |
13 #include "update_engine/file_writer.h" | 14 #include "update_engine/file_writer.h" |
14 #include "update_engine/update_metadata.pb.h" | 15 #include "update_engine/update_metadata.pb.h" |
15 | 16 |
16 namespace chromeos_update_engine { | 17 namespace chromeos_update_engine { |
17 | 18 |
18 class DeltaDiffGenerator { | 19 class DeltaDiffGenerator { |
19 public: | 20 public: |
20 // Encodes the metadata at new_path recursively into a DeltaArchiveManifest | 21 // Encodes the metadata at new_path recursively into a DeltaArchiveManifest |
21 // protobuf object. This will only read the filesystem. Children will | 22 // protobuf object. This will only read the filesystem. Children will |
22 // be recorded recursively iff they are on the same device as their | 23 // be recorded recursively iff they are on the same device as their |
23 // parent. | 24 // parent. |
24 // This will set all fields in the DeltaArchiveManifest except for | 25 // This will set all fields in the DeltaArchiveManifest except for |
25 // DeltaArchiveManifest_File_data_* as those are set only when writing | 26 // DeltaArchiveManifest_File_data_* as those are set only when writing |
26 // the actual delta file to disk. | 27 // the actual delta file to disk. |
27 // Caller is responsible for freeing the returned value. | 28 // Caller is responsible for freeing the returned value. |
28 // Returns NULL on failure. | 29 // Returns NULL on failure. |
29 static DeltaArchiveManifest* EncodeMetadataToProtoBuffer( | 30 static DeltaArchiveManifest* EncodeMetadataToProtoBuffer( |
30 const char* new_path); | 31 const char* new_path); |
31 | 32 |
32 // Takes a DeltaArchiveManifest as given from EncodeMetadataToProtoBuffer(), | 33 // Takes a DeltaArchiveManifest as given from EncodeMetadataToProtoBuffer(), |
33 // fill in the missing fields (DeltaArchiveManifest_File_data_*), and | 34 // fill in the missing fields (DeltaArchiveManifest_File_data_*), and |
34 // write the full delta out to the output file. | 35 // write the full delta out to the output file. |
| 36 // Any paths in nondiff_paths will be included in full, rather than |
| 37 // as a diff. This is useful for files that change during postinstall, since |
| 38 // future updates can't depend on them having remaining unchanged. |
35 // Returns true on success. | 39 // Returns true on success. |
36 // If non-empty, the device at force_compress_dev_path will be compressed. | 40 // If non-empty, the device at force_compress_dev_path will be compressed. |
37 static bool EncodeDataToDeltaFile(DeltaArchiveManifest* archive, | 41 static bool EncodeDataToDeltaFile( |
38 const std::string& old_path, | 42 DeltaArchiveManifest* archive, |
39 const std::string& new_path, | 43 const std::string& old_path, |
40 const std::string& out_file, | 44 const std::string& new_path, |
41 const std::string& force_compress_dev_path); | 45 const std::string& out_file, |
42 | 46 const std::set<std::string>& nondiff_paths, |
| 47 const std::string& force_compress_dev_path); |
| 48 |
43 private: | 49 private: |
44 // These functions encode all the data about a file that's not already | 50 // These functions encode all the data about a file that's not already |
45 // stored in the DeltaArchiveManifest message into the vector 'out'. | 51 // stored in the DeltaArchiveManifest message into the vector 'out'. |
46 // They all return true on success. | 52 // They all return true on success. |
47 | 53 |
48 // EncodeLink stores the path the symlink points to. | 54 // EncodeLink stores the path the symlink points to. |
49 static bool EncodeLink(const std::string& path, std::vector<char>* out); | 55 static bool EncodeLink(const std::string& path, std::vector<char>* out); |
50 // EncodeDev stores the major and minor device numbers. | 56 // EncodeDev stores the major and minor device numbers. |
51 // Specifically it writes a LinuxDevice message. | 57 // Specifically it writes a LinuxDevice message. |
52 static bool EncodeDev( | 58 static bool EncodeDev( |
53 const struct stat& stbuf, std::vector<char>* out, | 59 const struct stat& stbuf, std::vector<char>* out, |
54 DeltaArchiveManifest_File_DataFormat* format, | 60 DeltaArchiveManifest_File_DataFormat* format, |
55 bool force_compression); | 61 bool force_compression); |
56 // EncodeFile stores the full data, gzipped data, or a binary diff from | 62 // EncodeFile stores the full data, gzipped data, or a binary diff from |
57 // the old data. out_data_format will be set to the method used. | 63 // the old data. out_data_format will be set to the method used. |
58 static bool EncodeFile(const std::string& old_dir, | 64 static bool EncodeFile(const std::string& old_dir, |
59 const std::string& new_dir, | 65 const std::string& new_dir, |
60 const std::string& file_name, | 66 const std::string& file_name, |
| 67 const bool avoid_diff, |
61 DeltaArchiveManifest_File_DataFormat* out_data_format, | 68 DeltaArchiveManifest_File_DataFormat* out_data_format, |
62 std::vector<char>* out); | 69 std::vector<char>* out, |
| 70 bool* no_change); |
63 | 71 |
| 72 // nondiff_paths is passed in to EncodeDataToDeltaFile() with |
| 73 // paths relative to the installed system (e.g. /etc/fstab), but |
| 74 // WriteFileDiffsToDeltaFile requires always_full_target_paths to be |
| 75 // the entire path of the new file. |
64 // If non-empty, the device at force_compress_dev_path will be compressed. | 76 // If non-empty, the device at force_compress_dev_path will be compressed. |
65 static bool WriteFileDiffsToDeltaFile( | 77 static bool WriteFileDiffsToDeltaFile( |
66 DeltaArchiveManifest* archive, | 78 DeltaArchiveManifest* archive, |
67 DeltaArchiveManifest_File* file, | 79 DeltaArchiveManifest_File* file, |
68 const std::string& file_name, | 80 const std::string& file_name, |
69 const std::string& old_path, | 81 const std::string& old_path, |
70 const std::string& new_path, | 82 const std::string& new_path, |
71 FileWriter* out_file_writer, | 83 FileWriter* out_file_writer, |
72 int* out_file_length, | 84 int* out_file_length, |
| 85 std::set<std::string> always_full_target_paths, |
73 const std::string& force_compress_dev_path); | 86 const std::string& force_compress_dev_path); |
74 | 87 |
75 // This should never be constructed | 88 // This should never be constructed |
76 DISALLOW_IMPLICIT_CONSTRUCTORS(DeltaDiffGenerator); | 89 DISALLOW_IMPLICIT_CONSTRUCTORS(DeltaDiffGenerator); |
77 }; | 90 }; |
78 | 91 |
79 }; // namespace chromeos_update_engine | 92 }; // namespace chromeos_update_engine |
80 | 93 |
81 #endif // CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_DIFF_GENERATOR_H__ | 94 #endif // CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_DIFF_GENERATOR_H__ |
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