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annotate mercurial/revlogutils/revlogv0.py @ 47279:9d1a8829f959

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revlog: signal which revlog index are compatible with Rust Otherwise, Rust may treat python object like `cindex` object, leading to trouble. The new attribute is an integer because I expect we might need a flag field in the future. As a start we get the rust code to raise a clear TypeError. We will use the information in a smarter way in the next changesets. Differential Revision: https://phab.mercurial-scm.org/D10665
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 04 May 2021 14:16:26 +0200
parents 2b69555e4875
children ac60a1366a49
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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 COMP_MODE_INLINE,
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13 INDEX_ENTRY_V0,
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14 )
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15 from ..i18n import _
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16
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17 from .. import (
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18 error,
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19 node,
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20 pycompat,
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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 flagutil,
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26 nodemap as nodemaputil,
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27 )
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29
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30 def getoffset(q):
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31 return int(q >> 16)
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32
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33
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34 def gettype(q):
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35 return int(q & 0xFFFF)
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37
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38 def offset_type(offset, type):
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39 if (type & ~flagutil.REVIDX_KNOWN_FLAGS) != 0:
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40 raise ValueError(b'unknown revlog index flags')
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41 return int(int(offset) << 16 | type)
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42
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43
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44 class revlogoldindex(list):
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45 rust_ext_compat = 0
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46 entry_size = INDEX_ENTRY_V0.size
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47 null_item = (
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48 0,
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49 0,
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50 0,
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51 -1,
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52 -1,
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53 -1,
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54 -1,
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55 sha1nodeconstants.nullid,
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56 0,
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57 0,
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58 COMP_MODE_INLINE,
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59 COMP_MODE_INLINE,
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60 )
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61
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62 @property
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63 def nodemap(self):
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64 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]"
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65 util.nouideprecwarn(msg, b'5.3', stacklevel=2)
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66 return self._nodemap
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67
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68 @util.propertycache
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69 def _nodemap(self):
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70 nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: node.nullrev})
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71 for r in range(0, len(self)):
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72 n = self[r][7]
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73 nodemap[n] = r
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74 return nodemap
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75
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76 def has_node(self, node):
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77 """return True if the node exist in the index"""
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78 return node in self._nodemap
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79
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80 def rev(self, node):
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81 """return a revision for a node
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82
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83 If the node is unknown, raise a RevlogError"""
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84 return self._nodemap[node]
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85
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86 def get_rev(self, node):
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87 """return a revision for a node
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88
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89 If the node is unknown, return None"""
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90 return self._nodemap.get(node)
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91
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92 def append(self, tup):
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93 self._nodemap[tup[7]] = len(self)
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94 super(revlogoldindex, self).append(tup)
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95
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96 def __delitem__(self, i):
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97 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
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98 raise ValueError(b"deleting slices only supports a:-1 with step 1")
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99 for r in pycompat.xrange(i.start, len(self)):
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100 del self._nodemap[self[r][7]]
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101 super(revlogoldindex, self).__delitem__(i)
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102
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103 def clearcaches(self):
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104 self.__dict__.pop('_nodemap', None)
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105
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106 def __getitem__(self, i):
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107 if i == -1:
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108 return self.null_item
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109 return list.__getitem__(self, i)
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110
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111 def pack_header(self, header):
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112 """pack header information in binary"""
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113 return b''
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114
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115 def entry_binary(self, rev):
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116 """return the raw binary string representing a revision"""
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117 entry = self[rev]
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118 if gettype(entry[0]):
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119 raise error.RevlogError(
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120 _(b'index entry flags need revlog version 1')
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121 )
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122 e2 = (
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123 getoffset(entry[0]),
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124 entry[1],
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125 entry[3],
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126 entry[4],
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127 self[entry[5]][7],
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128 self[entry[6]][7],
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129 entry[7],
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130 )
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131 return INDEX_ENTRY_V0.pack(*e2)
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132
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133
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134 def parse_index_v0(data, inline):
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135 s = INDEX_ENTRY_V0.size
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136 index = []
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137 nodemap = nodemaputil.NodeMap({node.nullid: node.nullrev})
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138 n = off = 0
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139 l = len(data)
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140 while off + s <= l:
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141 cur = data[off : off + s]
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142 off += s
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143 e = INDEX_ENTRY_V0.unpack(cur)
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144 # transform to revlogv1 format
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145 e2 = (
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146 offset_type(e[0], 0),
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147 e[1],
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148 -1,
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149 e[2],
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150 e[3],
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151 nodemap.get(e[4], node.nullrev),
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152 nodemap.get(e[5], node.nullrev),
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153 e[6],
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154 0, # no side data support
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155 0, # no side data support
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156 COMP_MODE_INLINE,
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157 )
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158 index.append(e2)
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159 nodemap[e[6]] = n
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160 n += 1
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161
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162 index = revlogoldindex(index)
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163 return index, None