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annotate mercurial/revlogutils/revlogv0.py @ 52049:af54626bf358

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dirstate-map: add a missing debug wait point when accessing the v2 docket fc8e37c380d3 added synchronization points to the dirstate to allow for race condition testing without actually requiring a time-based race condition to happen. This changes adds the `pre-read-file` wait point before we read the docket, since callers might ask for the parents before anything else is read, leading to the first read being done before the wait point. This removes some differences in test output which were presumed to be speed related, but weren't.
author Rapha?l Gom?s <rgomes@octobus.net>
date Mon, 14 Oct 2024 14:14:21 +0200
parents 609700e5d8df
children 5cc8deb96b48
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1 # revlogv0 - code related to revlog format "V0"
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2 #
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3 # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com>
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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 from __future__ import annotations
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9
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10 from ..node import sha1nodeconstants
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11 from .constants import (
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12 INDEX_ENTRY_V0,
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13 )
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14 from ..i18n import _
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15
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16 from .. import (
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17 error,
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18 node,
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19 revlogutils,
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20 util,
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21 )
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22
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23 from . import (
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24 nodemap as nodemaputil,
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25 )
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26
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27
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28 def getoffset(q):
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29 return int(q >> 16)
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30
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31
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32 def gettype(q):
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33 return int(q & 0xFFFF)
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34
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35
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36 class revlogoldindex(list):
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37 rust_ext_compat = 0
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38 entry_size = INDEX_ENTRY_V0.size
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39 null_item = revlogutils.entry(
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40 data_offset=0,
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41 data_compressed_length=0,
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42 data_delta_base=node.nullrev,
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43 link_rev=node.nullrev,
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44 parent_rev_1=node.nullrev,
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45 parent_rev_2=node.nullrev,
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46 node_id=sha1nodeconstants.nullid,
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47 )
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48
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49 @util.propertycache
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50 def _nodemap(self):
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51 nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: node.nullrev})
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52 for r in range(0, len(self)):
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53 n = self[r][7]
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54 nodemap[n] = r
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55 return nodemap
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56
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57 def has_node(self, node):
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58 """return True if the node exist in the index"""
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59 return node in self._nodemap
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60
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61 def rev(self, node):
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62 """return a revision for a node
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63
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64 If the node is unknown, raise a RevlogError"""
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65 return self._nodemap[node]
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66
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67 def get_rev(self, node):
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68 """return a revision for a node
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69
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70 If the node is unknown, return None"""
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71 return self._nodemap.get(node)
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72
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73 def append(self, tup):
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74 self._nodemap[tup[7]] = len(self)
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75 super(revlogoldindex, self).append(tup)
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76
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77 def __delitem__(self, i):
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78 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
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79 raise ValueError(b"deleting slices only supports a:-1 with step 1")
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80 for r in range(i.start, len(self)):
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81 del self._nodemap[self[r][7]]
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82 super(revlogoldindex, self).__delitem__(i)
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83
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84 def clearcaches(self):
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85 self.__dict__.pop('_nodemap', None)
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86
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87 def __getitem__(self, i):
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88 if i == -1:
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89 return self.null_item
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90 return list.__getitem__(self, i)
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91
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92 def pack_header(self, header):
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93 """pack header information in binary"""
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94 return b''
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95
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96 def entry_binary(self, rev):
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97 """return the raw binary string representing a revision"""
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98 entry = self[rev]
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99 if gettype(entry[0]):
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100 raise error.RevlogError(
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101 _(b'index entry flags need revlog version 1')
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102 )
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103 e2 = (
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104 getoffset(entry[0]),
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105 entry[1],
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106 entry[3],
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107 entry[4],
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108 self[entry[5]][7],
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109 self[entry[6]][7],
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110 entry[7],
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111 )
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112 return INDEX_ENTRY_V0.pack(*e2)
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113
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114 def headrevs(self, excluded_revs=None, stop_rev=None):
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115 count = len(self)
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116 if stop_rev is not None:
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117 count = min(count, stop_rev)
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118 if not count:
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119 return [node.nullrev]
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120 # we won't iter over filtered rev so nobody is a head at start
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121 ishead = [0] * (count + 1)
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122 revs = range(count)
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123 if excluded_revs is not None:
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124 revs = (r for r in revs if r not in excluded_revs)
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125
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126 for r in revs:
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127 ishead[r] = 1 # I may be an head
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128 e = self[r]
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129 ishead[e[5]] = ishead[e[6]] = 0 # my parent are not
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130 return [r for r, val in enumerate(ishead) if val]
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131
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132
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133 def parse_index_v0(data, inline):
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134 s = INDEX_ENTRY_V0.size
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135 index = []
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136 nodemap = nodemaputil.NodeMap({node.nullid: node.nullrev})
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137 n = off = 0
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138 l = len(data)
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139 while off + s <= l:
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140 cur = data[off : off + s]
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141 off += s
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142 e = INDEX_ENTRY_V0.unpack(cur)
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143 # transform to revlogv1 format
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144 e2 = revlogutils.entry(
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145 data_offset=e[0],
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146 data_compressed_length=e[1],
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147 data_delta_base=e[2],
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148 link_rev=e[3],
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149 parent_rev_1=nodemap.get(e[4], node.nullrev),
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150 parent_rev_2=nodemap.get(e[5], node.nullrev),
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151 node_id=e[6],
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152 )
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153 index.append(e2)
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154 nodemap[e[6]] = n
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155 n += 1
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156
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157 index = revlogoldindex(index)
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158 return index, None