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annotate mercurial/revlogutils/constants.py @ 48534:2c6084f67a86

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changelog-v2: use helper constant in the code to pack/unpack entries This makes the code simpler to read and modify. This is probably less efficient, but we are talking about the Python implementation here, so performance is concerne secondary to readability. Differential Revision: https://phab.mercurial-scm.org/D11934
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 14 Dec 2021 19:24:24 +0100
parents a669404f0f4a
children d5137c00ab17
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1 # revlogdeltas.py - constant used for revlog logic.
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2 #
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3 # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com>
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4 # Copyright 2018 Octobus <contact@octobus.net>
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8 """Helper class to compute deltas stored inside revlogs"""
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9
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10 from __future__ import absolute_import
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11
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12 import struct
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13
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14 from ..interfaces import repository
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15 from .. import revlogutils
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16
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17 ### Internal utily constants
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18
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19 KIND_CHANGELOG = 1001 # over 256 to not be comparable with a bytes
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20 KIND_MANIFESTLOG = 1002
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21 KIND_FILELOG = 1003
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22 KIND_OTHER = 1004
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23
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24 ALL_KINDS = {
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25 KIND_CHANGELOG,
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26 KIND_MANIFESTLOG,
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27 KIND_FILELOG,
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28 KIND_OTHER,
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29 }
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30
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31 ### Index entry key
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32 #
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33 #
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34 # Internal details
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35 # ----------------
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36 #
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37 # A large part of the revlog logic deals with revisions' "index entries", tuple
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38 # objects that contains the same "items" whatever the revlog version.
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39 # Different versions will have different ways of storing these items (sometimes
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40 # not having them at all), but the tuple will always be the same. New fields
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41 # are usually added at the end to avoid breaking existing code that relies
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42 # on the existing order. The field are defined as follows:
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43
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44 # [0] offset:
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45 # The byte index of the start of revision data chunk.
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46 # That value is shifted up by 16 bits. use "offset = field >> 16" to
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47 # retrieve it.
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48 #
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49 # flags:
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50 # A flag field that carries special information or changes the behavior
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51 # of the revision. (see `REVIDX_*` constants for details)
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52 # The flag field only occupies the first 16 bits of this field,
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53 # use "flags = field & 0xFFFF" to retrieve the value.
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54 ENTRY_DATA_OFFSET = 0
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55
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56 # [1] compressed length:
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57 # The size, in bytes, of the chunk on disk
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58 ENTRY_DATA_COMPRESSED_LENGTH = 1
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59
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60 # [2] uncompressed length:
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61 # The size, in bytes, of the full revision once reconstructed.
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62 ENTRY_DATA_UNCOMPRESSED_LENGTH = 2
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63
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64 # [3] base rev:
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65 # Either the base of the revision delta chain (without general
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66 # delta), or the base of the delta (stored in the data chunk)
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67 # with general delta.
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68 ENTRY_DELTA_BASE = 3
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69
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70 # [4] link rev:
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71 # Changelog revision number of the changeset introducing this
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72 # revision.
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73 ENTRY_LINK_REV = 4
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74
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75 # [5] parent 1 rev:
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76 # Revision number of the first parent
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77 ENTRY_PARENT_1 = 5
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78
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79 # [6] parent 2 rev:
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80 # Revision number of the second parent
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81 ENTRY_PARENT_2 = 6
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82
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83 # [7] node id:
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84 # The node id of the current revision
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85 ENTRY_NODE_ID = 7
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86
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87 # [8] sidedata offset:
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88 # The byte index of the start of the revision's side-data chunk.
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89 ENTRY_SIDEDATA_OFFSET = 8
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90
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91 # [9] sidedata chunk length:
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92 # The size, in bytes, of the revision's side-data chunk.
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93 ENTRY_SIDEDATA_COMPRESSED_LENGTH = 9
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94
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95 # [10] data compression mode:
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96 # two bits that detail the way the data chunk is compressed on disk.
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97 # (see "COMP_MODE_*" constants for details). For revlog version 0 and
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98 # 1 this will always be COMP_MODE_INLINE.
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99 ENTRY_DATA_COMPRESSION_MODE = 10
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100
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101 # [11] side-data compression mode:
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102 # two bits that detail the way the sidedata chunk is compressed on disk.
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103 # (see "COMP_MODE_*" constants for details)
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104 ENTRY_SIDEDATA_COMPRESSION_MODE = 11
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105
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106 ### main revlog header
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107
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108 # We cannot rely on Struct.format is inconsistent for python <=3.6 versus above
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109 INDEX_HEADER_FMT = b">I"
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110 INDEX_HEADER = struct.Struct(INDEX_HEADER_FMT)
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111
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112 ## revlog version
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113 REVLOGV0 = 0
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114 REVLOGV1 = 1
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115 # Dummy value until file format is finalized.
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116 REVLOGV2 = 0xDEAD
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117 # Dummy value until file format is finalized.
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118 CHANGELOGV2 = 0xD34D
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119
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120 ## global revlog header flags
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121 # Shared across v1 and v2.
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122 FLAG_INLINE_DATA = 1 << 16
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123 # Only used by v1, implied by v2.
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124 FLAG_GENERALDELTA = 1 << 17
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125 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
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126 REVLOG_DEFAULT_FORMAT = REVLOGV1
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127 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
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128 REVLOGV0_FLAGS = 0
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129 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
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130 REVLOGV2_FLAGS = FLAG_INLINE_DATA
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131 CHANGELOGV2_FLAGS = 0
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132
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133 ### individual entry
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134
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135 ## index v0:
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136 # 4 bytes: offset
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137 # 4 bytes: compressed length
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138 # 4 bytes: base rev
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139 # 4 bytes: link rev
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140 # 20 bytes: parent 1 nodeid
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141 # 20 bytes: parent 2 nodeid
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142 # 20 bytes: nodeid
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143 INDEX_ENTRY_V0 = struct.Struct(b">4l20s20s20s")
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144
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145 ## index v1
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146 # 6 bytes: offset
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147 # 2 bytes: flags
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148 # 4 bytes: compressed length
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149 # 4 bytes: uncompressed length
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150 # 4 bytes: base rev
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151 # 4 bytes: link rev
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152 # 4 bytes: parent 1 rev
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153 # 4 bytes: parent 2 rev
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154 # 32 bytes: nodeid
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155 INDEX_ENTRY_V1 = struct.Struct(b">Qiiiiii20s12x")
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156 assert INDEX_ENTRY_V1.size == 32 * 2
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157
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158 # 6 bytes: offset
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159 # 2 bytes: flags
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160 # 4 bytes: compressed length
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161 # 4 bytes: uncompressed length
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162 # 4 bytes: base rev
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163 # 4 bytes: link rev
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164 # 4 bytes: parent 1 rev
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165 # 4 bytes: parent 2 rev
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166 # 32 bytes: nodeid
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167 # 8 bytes: sidedata offset
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168 # 4 bytes: sidedata compressed length
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169 # 1 bytes: compression mode (2 lower bit are data_compression_mode)
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170 # 19 bytes: Padding to align to 96 bytes (see RevlogV2Plan wiki page)
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171 INDEX_ENTRY_V2 = struct.Struct(b">Qiiiiii20s12xQiB19x")
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172 assert INDEX_ENTRY_V2.size == 32 * 3, INDEX_ENTRY_V2.size
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173
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174 # 6 bytes: offset
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175 # 2 bytes: flags
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176 # 4 bytes: compressed length
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177 # 4 bytes: uncompressed length
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178 # 4 bytes: parent 1 rev
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179 # 4 bytes: parent 2 rev
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180 # 32 bytes: nodeid
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181 # 8 bytes: sidedata offset
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182 # 4 bytes: sidedata compressed length
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183 # 1 bytes: compression mode (2 lower bit are data_compression_mode)
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184 # 27 bytes: Padding to align to 96 bytes (see RevlogV2Plan wiki page)
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185 INDEX_ENTRY_CL_V2 = struct.Struct(b">Qiiii20s12xQiB27x")
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186 assert INDEX_ENTRY_CL_V2.size == 32 * 3, INDEX_ENTRY_V2.size
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187 INDEX_ENTRY_V2_IDX_OFFSET = 0
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188 INDEX_ENTRY_V2_IDX_COMPRESSED_LENGTH = 1
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189 INDEX_ENTRY_V2_IDX_UNCOMPRESSED_LENGTH = 2
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190 INDEX_ENTRY_V2_IDX_PARENT_1 = 3
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191 INDEX_ENTRY_V2_IDX_PARENT_2 = 4
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192 INDEX_ENTRY_V2_IDX_NODEID = 5
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193 INDEX_ENTRY_V2_IDX_SIDEDATA_OFFSET = 6
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194 INDEX_ENTRY_V2_IDX_SIDEDATA_COMPRESSED_LENGTH = 7
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195 INDEX_ENTRY_V2_IDX_COMPRESSION_MODE = 8
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196
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197 # revlog index flags
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198
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199 # For historical reasons, revlog's internal flags were exposed via the
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200 # wire protocol and are even exposed in parts of the storage APIs.
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201
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202 # revision has censor metadata, must be verified
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203 REVIDX_ISCENSORED = repository.REVISION_FLAG_CENSORED
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204 # revision hash does not match data (narrowhg)
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205 REVIDX_ELLIPSIS = repository.REVISION_FLAG_ELLIPSIS
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206 # revision data is stored externally
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207 REVIDX_EXTSTORED = repository.REVISION_FLAG_EXTSTORED
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208 # revision changes files in a way that could affect copy tracing.
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209 REVIDX_HASCOPIESINFO = repository.REVISION_FLAG_HASCOPIESINFO
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210 REVIDX_DEFAULT_FLAGS = 0
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211 # stable order in which flags need to be processed and their processors applied
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212 REVIDX_FLAGS_ORDER = [
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213 REVIDX_ISCENSORED,
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214 REVIDX_ELLIPSIS,
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215 REVIDX_EXTSTORED,
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216 REVIDX_HASCOPIESINFO,
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217 ]
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218
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219 # bitmark for flags that could cause rawdata content change
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220 REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED
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221
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222 ## chunk compression mode constants:
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223 # These constants are used in revlog version >=2 to denote the compression used
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224 # for a chunk.
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225
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226 # Chunk use no compression, the data stored on disk can be directly use as
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227 # chunk value. Without any header information prefixed.
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228 COMP_MODE_PLAIN = 0
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229
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230 # Chunk use the "default compression" for the revlog (usually defined in the
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231 # revlog docket). A header is still used.
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232 #
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233 # XXX: keeping a header is probably not useful and we should probably drop it.
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234 #
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235 # XXX: The value of allow mixed type of compression in the revlog is unclear
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236 # and we should consider making PLAIN/DEFAULT the only available mode for
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237 # revlog v2, disallowing INLINE mode.
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238 COMP_MODE_DEFAULT = 1
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239
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240 # Chunk use a compression mode stored "inline" at the start of the chunk
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241 # itself. This is the mode always used for revlog version "0" and "1"
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242 COMP_MODE_INLINE = revlogutils.COMP_MODE_INLINE
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243
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244 SUPPORTED_FLAGS = {
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245 REVLOGV0: REVLOGV0_FLAGS,
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246 REVLOGV1: REVLOGV1_FLAGS,
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247 REVLOGV2: REVLOGV2_FLAGS,
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248 CHANGELOGV2: CHANGELOGV2_FLAGS,
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249 }
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250
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251 _no = lambda flags: False
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252 _yes = lambda flags: True
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253
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254
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255 def _from_flag(flag):
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256 return lambda flags: bool(flags & flag)
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257
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258
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259 FEATURES_BY_VERSION = {
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260 REVLOGV0: {
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261 b'inline': _no,
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262 b'generaldelta': _no,
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263 b'sidedata': False,
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264 b'docket': False,
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265 },
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266 REVLOGV1: {
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267 b'inline': _from_flag(FLAG_INLINE_DATA),
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268 b'generaldelta': _from_flag(FLAG_GENERALDELTA),
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269 b'sidedata': False,
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270 b'docket': False,
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271 },
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272 REVLOGV2: {
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273 # The point of inline-revlog is to reduce the number of files used in
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274 # the store. Using a docket defeat this purpose. So we needs other
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275 # means to reduce the number of files for revlogv2.
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276 b'inline': _no,
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277 b'generaldelta': _yes,
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278 b'sidedata': True,
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279 b'docket': True,
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280 },
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281 CHANGELOGV2: {
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282 b'inline': _no,
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283 # General delta is useless for changelog since we don't do any delta
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284 b'generaldelta': _no,
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285 b'sidedata': True,
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286 b'docket': True,
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287 },
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288 }
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289
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290
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291 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000