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annotate mercurial/revlogutils/docket.py @ 47290:40b51c28b242

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dirstate-v2: Update the expected output of some tests for new requirement Fix most test failures (except in test-narrow-debugrebuilddirstate.t and test-upgrade-repo.t) caused by the new entry in config or in .hg/requires when running `run-tests.py --extra-config-opt format.exp-dirstate-v2=1` There is no CI?so far for this configuration. Differential Revision: https://phab.mercurial-scm.org/D10718
author Simon Sapin <simon.sapin@octobus.net>
date Wed, 19 May 2021 13:15:00 +0200
parents 921648d31553
children 7ea39d633cf3
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1 # docket - code related to revlog "docket"
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2 #
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3 # Copyright 2021 Pierre-Yves David <pierre-yves.david@octobus.net>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 ### Revlog docket file
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9 #
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10 # The revlog is stored on disk using multiple files:
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11 #
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12 # * a small docket file, containing metadata and a pointer,
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13 #
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14 # * an index file, containing fixed width information about revisions,
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15 #
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16 # * a data file, containing variable width data for these revisions,
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17
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18 from __future__ import absolute_import
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19
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20 import struct
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21
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22 from .. import (
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23 error,
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24 util,
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25 )
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26
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27 from . import (
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28 constants,
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29 )
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30
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31 # Docket format
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32 #
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33 # * 4 bytes: revlog version
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34 # | This is mandatory as docket must be compatible with the previous
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35 # | revlog index header.
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36 # * 8 bytes: size of index-data
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37 # * 8 bytes: pending size of index-data
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38 # * 8 bytes: size of data
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39 # * 8 bytes: pending size of data
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40 # * 1 bytes: default compression header
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41 S_HEADER = struct.Struct(constants.INDEX_HEADER.format + 'LLLLc')
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42
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43
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44 class RevlogDocket(object):
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45 """metadata associated with revlog"""
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46
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47 def __init__(
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48 self,
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49 revlog,
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50 use_pending=False,
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51 version_header=None,
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52 index_end=0,
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53 pending_index_end=0,
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54 data_end=0,
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55 pending_data_end=0,
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56 default_compression_header=None,
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57 ):
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58 self._version_header = version_header
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59 self._read_only = bool(use_pending)
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60 self._dirty = False
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61 self._radix = revlog.radix
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62 self._path = revlog._docket_file
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63 self._opener = revlog.opener
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64 # thes asserts should be True as long as we have a single index filename
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65 assert index_end <= pending_index_end
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66 assert data_end <= pending_data_end
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67 self._initial_index_end = index_end
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68 self._pending_index_end = pending_index_end
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69 self._initial_data_end = data_end
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70 self._pending_data_end = pending_data_end
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71 if use_pending:
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72 self._index_end = self._pending_index_end
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73 self._data_end = self._pending_data_end
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74 else:
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75 self._index_end = self._initial_index_end
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76 self._data_end = self._initial_data_end
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77 self.default_compression_header = default_compression_header
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78
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79 def index_filepath(self):
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80 """file path to the current index file associated to this docket"""
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81 # very simplistic version at first
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82 return b"%s.idx" % self._radix
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83
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84 @property
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85 def index_end(self):
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86 return self._index_end
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87
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88 @index_end.setter
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89 def index_end(self, new_size):
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90 if new_size != self._index_end:
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91 self._index_end = new_size
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92 self._dirty = True
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93
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94 @property
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95 def data_end(self):
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96 return self._data_end
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97
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98 @data_end.setter
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99 def data_end(self, new_size):
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100 if new_size != self._data_end:
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101 self._data_end = new_size
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102 self._dirty = True
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103
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104 def write(self, transaction, pending=False, stripping=False):
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105 """write the modification of disk if any
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106
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107 This make the new content visible to all process"""
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108 if not self._dirty:
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109 return False
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110 else:
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111 if self._read_only:
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112 msg = b'writing read-only docket: %s'
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113 msg %= self._path
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114 raise error.ProgrammingError(msg)
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115 if not stripping:
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116 # XXX we could, leverage the docket while stripping. However it
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117 # is not powerfull enough at the time of this comment
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118 transaction.addbackup(self._path, location=b'store')
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119 with self._opener(self._path, mode=b'w', atomictemp=True) as f:
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120 f.write(self._serialize(pending=pending))
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121 # if pending we still need to the write final data eventually
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122 self._dirty = pending
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123 return True
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124
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125 def _serialize(self, pending=False):
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126 if pending:
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127 official_index_end = self._initial_index_end
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128 official_data_end = self._initial_data_end
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129 else:
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130 official_index_end = self._index_end
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131 official_data_end = self._data_end
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132
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133 # this assert should be True as long as we have a single index filename
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134 assert official_data_end <= self._data_end
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135 data = (
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136 self._version_header,
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137 official_index_end,
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138 self._index_end,
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139 official_data_end,
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140 self._data_end,
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141 self.default_compression_header,
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142 )
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143 return S_HEADER.pack(*data)
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144
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145
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146 def default_docket(revlog, version_header):
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147 """given a revlog version a new docket object for the given revlog"""
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148 rl_version = version_header & 0xFFFF
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149 if rl_version not in (constants.REVLOGV2, constants.CHANGELOGV2):
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150 return None
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151 comp = util.compengines[revlog._compengine].revlogheader()
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152 docket = RevlogDocket(
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153 revlog,
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154 version_header=version_header,
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155 default_compression_header=comp,
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156 )
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157 docket._dirty = True
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158 return docket
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159
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160
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161 def parse_docket(revlog, data, use_pending=False):
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162 """given some docket data return a docket object for the given revlog"""
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163 header = S_HEADER.unpack(data[: S_HEADER.size])
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164 version_header = header[0]
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165 index_size = header[1]
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166 pending_index_size = header[2]
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167 data_size = header[3]
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168 pending_data_size = header[4]
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169 default_compression_header = header[5]
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170 docket = RevlogDocket(
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171 revlog,
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172 use_pending=use_pending,
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173 version_header=version_header,
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174 index_end=index_size,
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175 pending_index_end=pending_index_size,
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176 data_end=data_size,
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177 pending_data_end=pending_data_size,
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178 default_compression_header=default_compression_header,
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179 )
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180 return docket