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annotate mercurial/revlogutils/revlogv0.py @ 47156:4292bed8da7c

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revlog: make the index always return the same tuple It is simpler to manage the diferrence in on disk format in the internal index code itself and lets the rest of the code always handle the same object. This will become even more important when the data we store will be entirely different (for example the changelog does not need the "linkrev" field. We start with item reading, we will deal with item writing in the next changesets. Differential Revision: https://phab.mercurial-scm.org/D10568
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 03 May 2021 12:21:15 +0200
parents 724db234b790
children ba21cfd9b044
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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 util,
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21 )
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22
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23 from . import (
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24 flagutil,
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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 def offset_type(offset, type):
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38 if (type & ~flagutil.REVIDX_KNOWN_FLAGS) != 0:
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39 raise ValueError(b'unknown revlog index flags')
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40 return int(int(offset) << 16 | type)
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41
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42
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43 class revlogoldindex(list):
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44 entry_size = INDEX_ENTRY_V0.size
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45
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46 @property
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47 def nodemap(self):
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48 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]"
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49 util.nouideprecwarn(msg, b'5.3', stacklevel=2)
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50 return self._nodemap
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51
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52 @util.propertycache
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53 def _nodemap(self):
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54 nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: node.nullrev})
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55 for r in range(0, len(self)):
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56 n = self[r][7]
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57 nodemap[n] = r
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58 return nodemap
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59
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60 def has_node(self, node):
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61 """return True if the node exist in the index"""
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62 return node in self._nodemap
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63
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64 def rev(self, node):
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65 """return a revision for a node
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66
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67 If the node is unknown, raise a RevlogError"""
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68 return self._nodemap[node]
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69
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70 def get_rev(self, node):
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71 """return a revision for a node
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72
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73 If the node is unknown, return None"""
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74 return self._nodemap.get(node)
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75
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76 def append(self, tup):
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77 self._nodemap[tup[7]] = len(self)
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78 super(revlogoldindex, self).append(tup)
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79
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80 def __delitem__(self, i):
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81 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
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82 raise ValueError(b"deleting slices only supports a:-1 with step 1")
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83 for r in pycompat.xrange(i.start, len(self)):
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84 del self._nodemap[self[r][7]]
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85 super(revlogoldindex, self).__delitem__(i)
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86
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87 def clearcaches(self):
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88 self.__dict__.pop('_nodemap', None)
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89
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90 def __getitem__(self, i):
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91 if i == -1:
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92 return (0, 0, 0, -1, -1, -1, -1, node.nullid)
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93 return list.__getitem__(self, i)
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94
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95 def pack_header(self, header):
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96 """pack header information in binary"""
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97 return b''
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98
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99 def entry_binary(self, rev):
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100 """return the raw binary string representing a revision"""
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101 entry = self[rev]
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102 if gettype(entry[0]):
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103 raise error.RevlogError(
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104 _(b'index entry flags need revlog version 1')
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105 )
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106 e2 = (
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107 getoffset(entry[0]),
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108 entry[1],
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109 entry[3],
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110 entry[4],
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111 self[entry[5]][7],
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112 self[entry[6]][7],
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113 entry[7],
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114 )
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115 return INDEX_ENTRY_V0.pack(*e2)
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116
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117
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118 def parse_index_v0(data, inline):
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119 s = INDEX_ENTRY_V0.size
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120 index = []
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121 nodemap = nodemaputil.NodeMap({node.nullid: node.nullrev})
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122 n = off = 0
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123 l = len(data)
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124 while off + s <= l:
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125 cur = data[off : off + s]
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126 off += s
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127 e = INDEX_ENTRY_V0.unpack(cur)
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128 # transform to revlogv1 format
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129 e2 = (
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130 offset_type(e[0], 0),
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131 e[1],
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132 -1,
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133 e[2],
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134 e[3],
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135 nodemap.get(e[4], node.nullrev),
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136 nodemap.get(e[5], node.nullrev),
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137 e[6],
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138 0, # no side data support
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139 0, # no side data support
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140 )
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141 index.append(e2)
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142 nodemap[e[6]] = n
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143 n += 1
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144
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145 index = revlogoldindex(index)
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146 return index, None