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annotate mercurial/revlogutils/revlogv0.py @ 47079:724db234b790

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revlog: code for `revlogv0` in its own module This code is mostly unused compatiblity code. Yet it take a prohiminent place in the `revlog.py` module. That module is already quite big, so we move all that code in a dedicated module. Differential Revision: https://phab.mercurial-scm.org/D10511
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Thu, 08 Apr 2021 00:34:16 +0200
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children 4292bed8da7c
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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 )
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139 index.append(e2)
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140 nodemap[e[6]] = n
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141 n += 1
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142
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143 index = revlogoldindex(index)
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144 return index, None