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annotate mercurial/revlogutils/revlogv0.py @ 47403:8f87dcb46f53

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revlog: use entry in revlogv0.py This make things clearer and we can reply on some of the default value directly. Differential Revision: https://phab.mercurial-scm.org/D10795
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Sun, 30 May 2021 17:11:21 +0200
parents ac60a1366a49
children c514936d92b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 from __future__ import absolute_import
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8
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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 pycompat,
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20 revlogutils,
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21 util,
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22 )
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23
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24 from . import (
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25 nodemap as nodemaputil,
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26 )
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28
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29 def getoffset(q):
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30 return int(q >> 16)
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31
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32
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33 def gettype(q):
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34 return int(q & 0xFFFF)
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35
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36
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37 class revlogoldindex(list):
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38 rust_ext_compat = 0
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39 entry_size = INDEX_ENTRY_V0.size
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40 null_item = revlogutils.entry(
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41 data_offset=0,
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42 data_compressed_length=0,
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43 data_delta_base=node.nullrev,
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44 link_rev=node.nullrev,
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45 parent_rev_1=node.nullrev,
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46 parent_rev_2=node.nullrev,
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47 node_id=sha1nodeconstants.nullid,
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48 )
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49
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50 @property
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51 def nodemap(self):
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52 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]"
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53 util.nouideprecwarn(msg, b'5.3', stacklevel=2)
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54 return self._nodemap
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55
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56 @util.propertycache
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57 def _nodemap(self):
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58 nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: node.nullrev})
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59 for r in range(0, len(self)):
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60 n = self[r][7]
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61 nodemap[n] = r
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62 return nodemap
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63
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64 def has_node(self, node):
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65 """return True if the node exist in the index"""
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66 return node in self._nodemap
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67
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68 def rev(self, node):
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69 """return a revision for a node
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70
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71 If the node is unknown, raise a RevlogError"""
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72 return self._nodemap[node]
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73
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74 def get_rev(self, node):
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75 """return a revision for a node
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76
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77 If the node is unknown, return None"""
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78 return self._nodemap.get(node)
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79
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80 def append(self, tup):
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81 self._nodemap[tup[7]] = len(self)
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82 super(revlogoldindex, self).append(tup)
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83
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84 def __delitem__(self, i):
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85 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
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86 raise ValueError(b"deleting slices only supports a:-1 with step 1")
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87 for r in pycompat.xrange(i.start, len(self)):
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88 del self._nodemap[self[r][7]]
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89 super(revlogoldindex, self).__delitem__(i)
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90
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91 def clearcaches(self):
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92 self.__dict__.pop('_nodemap', None)
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93
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94 def __getitem__(self, i):
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95 if i == -1:
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96 return self.null_item
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97 return list.__getitem__(self, i)
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98
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99 def pack_header(self, header):
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100 """pack header information in binary"""
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101 return b''
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102
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103 def entry_binary(self, rev):
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104 """return the raw binary string representing a revision"""
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105 entry = self[rev]
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106 if gettype(entry[0]):
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107 raise error.RevlogError(
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108 _(b'index entry flags need revlog version 1')
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109 )
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110 e2 = (
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111 getoffset(entry[0]),
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112 entry[1],
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113 entry[3],
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114 entry[4],
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115 self[entry[5]][7],
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116 self[entry[6]][7],
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117 entry[7],
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118 )
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119 return INDEX_ENTRY_V0.pack(*e2)
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120
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121
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122 def parse_index_v0(data, inline):
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123 s = INDEX_ENTRY_V0.size
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124 index = []
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125 nodemap = nodemaputil.NodeMap({node.nullid: node.nullrev})
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126 n = off = 0
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127 l = len(data)
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128 while off + s <= l:
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129 cur = data[off : off + s]
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130 off += s
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131 e = INDEX_ENTRY_V0.unpack(cur)
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132 # transform to revlogv1 format
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133 e2 = revlogutils.entry(
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134 data_offset=e[0],
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135 data_compressed_length=e[1],
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136 data_delta_base=e[2],
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137 link_rev=e[3],
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138 parent_rev_1=nodemap.get(e[4], node.nullrev),
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139 parent_rev_2=nodemap.get(e[5], node.nullrev),
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140 node_id=e[6],
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141 )
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142 index.append(e2)
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143 nodemap[e[6]] = n
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144 n += 1
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145
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146 index = revlogoldindex(index)
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147 return index, None