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annotate mercurial/revlogutils/constants.py @ 47260:130c9f7ed914

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revlog: add a "data compression mode" entry in the index tuple That will make it possible to keep track of compression information in the revlog index, opening the way to more efficient revision restoration (in native code, but the python usage is already defeating performance work). We start with adding a new entry to the index tuple, using a value matching the current behavior. We will introduce storage and other value in later changesets. Differential Revision: https://phab.mercurial-scm.org/D10646
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 03 May 2021 18:19:16 +0200
parents 616b8f412676
children 6bfa6c2c5f15
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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16 ### Internal utily constants
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17
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18 KIND_CHANGELOG = 1001 # over 256 to not be comparable with a bytes
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19 KIND_MANIFESTLOG = 1002
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20 KIND_FILELOG = 1003
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21 KIND_OTHER = 1004
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22
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23 ALL_KINDS = {
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24 KIND_CHANGELOG,
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25 KIND_MANIFESTLOG,
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26 KIND_FILELOG,
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27 KIND_OTHER,
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28 }
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29
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30 ### main revlog header
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31
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32 INDEX_HEADER = struct.Struct(b">I")
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33
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34 ## revlog version
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35 REVLOGV0 = 0
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36 REVLOGV1 = 1
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37 # Dummy value until file format is finalized.
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38 REVLOGV2 = 0xDEAD
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39
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40 ## global revlog header flags
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41 # Shared across v1 and v2.
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42 FLAG_INLINE_DATA = 1 << 16
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43 # Only used by v1, implied by v2.
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44 FLAG_GENERALDELTA = 1 << 17
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45 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
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46 REVLOG_DEFAULT_FORMAT = REVLOGV1
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47 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
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48 REVLOGV0_FLAGS = 0
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49 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
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50 REVLOGV2_FLAGS = FLAG_INLINE_DATA
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51
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52 ### individual entry
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53
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54 ## index v0:
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55 # 4 bytes: offset
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56 # 4 bytes: compressed length
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57 # 4 bytes: base rev
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58 # 4 bytes: link rev
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59 # 20 bytes: parent 1 nodeid
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60 # 20 bytes: parent 2 nodeid
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61 # 20 bytes: nodeid
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62 INDEX_ENTRY_V0 = struct.Struct(b">4l20s20s20s")
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63
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64 ## index v1
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65 # 6 bytes: offset
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66 # 2 bytes: flags
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67 # 4 bytes: compressed length
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68 # 4 bytes: uncompressed length
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69 # 4 bytes: base rev
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70 # 4 bytes: link rev
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71 # 4 bytes: parent 1 rev
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72 # 4 bytes: parent 2 rev
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73 # 32 bytes: nodeid
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74 INDEX_ENTRY_V1 = struct.Struct(b">Qiiiiii20s12x")
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75 assert INDEX_ENTRY_V1.size == 32 * 2
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76
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77 # 6 bytes: offset
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78 # 2 bytes: flags
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79 # 4 bytes: compressed length
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80 # 4 bytes: uncompressed length
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81 # 4 bytes: base rev
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82 # 4 bytes: link rev
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83 # 4 bytes: parent 1 rev
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84 # 4 bytes: parent 2 rev
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85 # 32 bytes: nodeid
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86 # 8 bytes: sidedata offset
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87 # 4 bytes: sidedata compressed length
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88 # 20 bytes: Padding to align to 96 bytes (see RevlogV2Plan wiki page)
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89 INDEX_ENTRY_V2 = struct.Struct(b">Qiiiiii20s12xQi20x")
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90 assert INDEX_ENTRY_V2.size == 32 * 3
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91
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92 # revlog index flags
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93
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94 # For historical reasons, revlog's internal flags were exposed via the
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95 # wire protocol and are even exposed in parts of the storage APIs.
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96
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97 # revision has censor metadata, must be verified
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98 REVIDX_ISCENSORED = repository.REVISION_FLAG_CENSORED
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99 # revision hash does not match data (narrowhg)
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100 REVIDX_ELLIPSIS = repository.REVISION_FLAG_ELLIPSIS
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101 # revision data is stored externally
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102 REVIDX_EXTSTORED = repository.REVISION_FLAG_EXTSTORED
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103 # revision changes files in a way that could affect copy tracing.
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104 REVIDX_HASCOPIESINFO = repository.REVISION_FLAG_HASCOPIESINFO
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105 REVIDX_DEFAULT_FLAGS = 0
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106 # stable order in which flags need to be processed and their processors applied
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107 REVIDX_FLAGS_ORDER = [
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108 REVIDX_ISCENSORED,
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109 REVIDX_ELLIPSIS,
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110 REVIDX_EXTSTORED,
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111 REVIDX_HASCOPIESINFO,
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112 ]
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113
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114 # bitmark for flags that could cause rawdata content change
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115 REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED
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116
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117 ## chunk compression mode constants:
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118 # These constants are used in revlog version >=2 to denote the compression used
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119 # for a chunk.
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120
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121 # Chunk use a compression mode stored "inline" at the start of the chunk
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122 # itself. This is the mode always used for revlog version "0" and "1"
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123 COMP_MODE_INLINE = 2
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124
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125 SUPPORTED_FLAGS = {
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126 REVLOGV0: REVLOGV0_FLAGS,
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127 REVLOGV1: REVLOGV1_FLAGS,
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128 REVLOGV2: REVLOGV2_FLAGS,
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129 }
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130
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131 _no = lambda flags: False
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132 _yes = lambda flags: True
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133
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134
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135 def _from_flag(flag):
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136 return lambda flags: bool(flags & flag)
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137
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138
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139 FEATURES_BY_VERSION = {
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140 REVLOGV0: {
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141 b'inline': _no,
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142 b'generaldelta': _no,
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143 b'sidedata': False,
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144 b'docket': False,
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145 },
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146 REVLOGV1: {
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147 b'inline': _from_flag(FLAG_INLINE_DATA),
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148 b'generaldelta': _from_flag(FLAG_GENERALDELTA),
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149 b'sidedata': False,
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150 b'docket': False,
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151 },
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152 REVLOGV2: {
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153 # The point of inline-revlog is to reduce the number of files used in
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154 # the store. Using a docket defeat this purpose. So we needs other
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155 # means to reduce the number of files for revlogv2.
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156 b'inline': _no,
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157 b'generaldelta': _yes,
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158 b'sidedata': True,
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159 b'docket': True,
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160 },
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161 }
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162
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163
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164 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000