Mercurial > hg
annotate hgext/remotefilelog/historypack.py @ 47012:d55b71393907
node: replace nullid and friends with nodeconstants class
The introduction of 256bit hashes require changes to nullid and other
constant magic values. Start pushing them down from repository and
revlog where sensible.
Differential Revision: https://phab.mercurial-scm.org/D9465
author | Joerg Sonnenberger <joerg@bec.de> |
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date | Mon, 29 Mar 2021 01:52:06 +0200 |
parents | 9d2b2df2c2ba |
children | 6000f5b25c9b |
rev | line source |
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1 from __future__ import absolute_import |
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2 |
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3 import struct |
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4 |
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5 from mercurial.node import ( |
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6 hex, |
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7 sha1nodeconstants, |
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8 ) |
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9 from mercurial import ( |
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10 pycompat, |
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11 util, |
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12 ) |
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13 from mercurial.utils import hashutil |
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14 from . import ( |
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15 basepack, |
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16 constants, |
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17 shallowutil, |
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18 ) |
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19 |
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20 # (filename hash, offset, size) |
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21 INDEXFORMAT2 = b'!20sQQII' |
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22 INDEXENTRYLENGTH2 = struct.calcsize(INDEXFORMAT2) |
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23 NODELENGTH = 20 |
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24 |
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25 NODEINDEXFORMAT = b'!20sQ' |
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26 NODEINDEXENTRYLENGTH = struct.calcsize(NODEINDEXFORMAT) |
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27 |
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28 # (node, p1, p2, linknode) |
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29 PACKFORMAT = b"!20s20s20s20sH" |
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30 PACKENTRYLENGTH = 82 |
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31 |
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32 ENTRYCOUNTSIZE = 4 |
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33 |
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34 INDEXSUFFIX = b'.histidx' |
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35 PACKSUFFIX = b'.histpack' |
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36 |
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37 ANC_NODE = 0 |
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38 ANC_P1NODE = 1 |
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39 ANC_P2NODE = 2 |
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40 ANC_LINKNODE = 3 |
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41 ANC_COPYFROM = 4 |
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42 |
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43 |
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44 class historypackstore(basepack.basepackstore): |
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45 INDEXSUFFIX = INDEXSUFFIX |
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46 PACKSUFFIX = PACKSUFFIX |
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47 |
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48 def getpack(self, path): |
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49 return historypack(path) |
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50 |
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51 def getancestors(self, name, node, known=None): |
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52 for pack in self.packs: |
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53 try: |
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54 return pack.getancestors(name, node, known=known) |
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55 except KeyError: |
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56 pass |
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57 |
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58 for pack in self.refresh(): |
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59 try: |
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60 return pack.getancestors(name, node, known=known) |
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61 except KeyError: |
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62 pass |
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63 |
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64 raise KeyError((name, node)) |
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65 |
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66 def getnodeinfo(self, name, node): |
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67 for pack in self.packs: |
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68 try: |
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69 return pack.getnodeinfo(name, node) |
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70 except KeyError: |
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71 pass |
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72 |
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73 for pack in self.refresh(): |
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74 try: |
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75 return pack.getnodeinfo(name, node) |
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76 except KeyError: |
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77 pass |
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78 |
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79 raise KeyError((name, node)) |
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80 |
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81 def add(self, filename, node, p1, p2, linknode, copyfrom): |
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82 raise RuntimeError( |
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83 b"cannot add to historypackstore (%s:%s)" % (filename, hex(node)) |
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84 ) |
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85 |
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86 |
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87 class historypack(basepack.basepack): |
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88 INDEXSUFFIX = INDEXSUFFIX |
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89 PACKSUFFIX = PACKSUFFIX |
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90 |
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91 SUPPORTED_VERSIONS = [2] |
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92 |
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93 def __init__(self, path): |
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94 super(historypack, self).__init__(path) |
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95 self.INDEXFORMAT = INDEXFORMAT2 |
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96 self.INDEXENTRYLENGTH = INDEXENTRYLENGTH2 |
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97 |
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98 def getmissing(self, keys): |
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99 missing = [] |
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100 for name, node in keys: |
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101 try: |
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102 self._findnode(name, node) |
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103 except KeyError: |
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104 missing.append((name, node)) |
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105 |
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106 return missing |
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107 |
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108 def getancestors(self, name, node, known=None): |
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109 """Returns as many ancestors as we're aware of. |
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110 |
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111 return value: { |
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112 node: (p1, p2, linknode, copyfrom), |
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113 ... |
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114 } |
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115 """ |
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116 if known and node in known: |
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117 return [] |
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118 |
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119 ancestors = self._getancestors(name, node, known=known) |
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120 results = {} |
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121 for ancnode, p1, p2, linknode, copyfrom in ancestors: |
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122 results[ancnode] = (p1, p2, linknode, copyfrom) |
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123 |
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124 if not results: |
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125 raise KeyError((name, node)) |
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126 return results |
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127 |
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128 def getnodeinfo(self, name, node): |
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129 # Drop the node from the tuple before returning, since the result should |
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130 # just be (p1, p2, linknode, copyfrom) |
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131 return self._findnode(name, node)[1:] |
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132 |
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133 def _getancestors(self, name, node, known=None): |
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134 if known is None: |
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135 known = set() |
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136 section = self._findsection(name) |
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137 filename, offset, size, nodeindexoffset, nodeindexsize = section |
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138 pending = {node} |
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139 o = 0 |
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140 while o < size: |
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141 if not pending: |
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142 break |
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143 entry, copyfrom = self._readentry(offset + o) |
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144 o += PACKENTRYLENGTH |
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145 if copyfrom: |
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146 o += len(copyfrom) |
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147 |
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148 ancnode = entry[ANC_NODE] |
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149 if ancnode in pending: |
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150 pending.remove(ancnode) |
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151 p1node = entry[ANC_P1NODE] |
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152 p2node = entry[ANC_P2NODE] |
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153 if p1node != sha1nodeconstants.nullid and p1node not in known: |
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154 pending.add(p1node) |
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155 if p2node != sha1nodeconstants.nullid and p2node not in known: |
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156 pending.add(p2node) |
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157 |
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158 yield (ancnode, p1node, p2node, entry[ANC_LINKNODE], copyfrom) |
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159 |
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160 def _readentry(self, offset): |
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161 data = self._data |
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162 entry = struct.unpack( |
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163 PACKFORMAT, data[offset : offset + PACKENTRYLENGTH] |
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164 ) |
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165 copyfrom = None |
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166 copyfromlen = entry[ANC_COPYFROM] |
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167 if copyfromlen != 0: |
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168 offset += PACKENTRYLENGTH |
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169 copyfrom = data[offset : offset + copyfromlen] |
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170 return entry, copyfrom |
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171 |
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172 def add(self, filename, node, p1, p2, linknode, copyfrom): |
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173 raise RuntimeError( |
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174 b"cannot add to historypack (%s:%s)" % (filename, hex(node)) |
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175 ) |
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176 |
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177 def _findnode(self, name, node): |
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178 if self.VERSION == 0: |
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179 ancestors = self._getancestors(name, node) |
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180 for ancnode, p1node, p2node, linknode, copyfrom in ancestors: |
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181 if ancnode == node: |
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182 return (ancnode, p1node, p2node, linknode, copyfrom) |
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183 else: |
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184 section = self._findsection(name) |
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185 nodeindexoffset, nodeindexsize = section[3:] |
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186 entry = self._bisect( |
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187 node, |
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188 nodeindexoffset, |
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189 nodeindexoffset + nodeindexsize, |
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190 NODEINDEXENTRYLENGTH, |
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191 ) |
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192 if entry is not None: |
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193 node, offset = struct.unpack(NODEINDEXFORMAT, entry) |
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194 entry, copyfrom = self._readentry(offset) |
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195 # Drop the copyfromlen from the end of entry, and replace it |
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196 # with the copyfrom string. |
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197 return entry[:4] + (copyfrom,) |
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198 |
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199 raise KeyError(b"unable to find history for %s:%s" % (name, hex(node))) |
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200 |
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201 def _findsection(self, name): |
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202 params = self.params |
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203 namehash = hashutil.sha1(name).digest() |
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204 fanoutkey = struct.unpack( |
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205 params.fanoutstruct, namehash[: params.fanoutprefix] |
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206 )[0] |
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207 fanout = self._fanouttable |
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208 |
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209 start = fanout[fanoutkey] + params.indexstart |
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210 indexend = self._indexend |
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211 |
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212 for i in pycompat.xrange(fanoutkey + 1, params.fanoutcount): |
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213 end = fanout[i] + params.indexstart |
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214 if end != start: |
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215 break |
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216 else: |
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217 end = indexend |
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218 |
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219 entry = self._bisect(namehash, start, end, self.INDEXENTRYLENGTH) |
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220 if not entry: |
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221 raise KeyError(name) |
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222 |
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223 rawentry = struct.unpack(self.INDEXFORMAT, entry) |
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224 x, offset, size, nodeindexoffset, nodeindexsize = rawentry |
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225 rawnamelen = self._index[ |
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226 nodeindexoffset : nodeindexoffset + constants.FILENAMESIZE |
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227 ] |
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228 actualnamelen = struct.unpack(b'!H', rawnamelen)[0] |
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229 nodeindexoffset += constants.FILENAMESIZE |
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230 actualname = self._index[ |
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231 nodeindexoffset : nodeindexoffset + actualnamelen |
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232 ] |
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233 if actualname != name: |
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234 raise KeyError( |
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235 b"found file name %s when looking for %s" % (actualname, name) |
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236 ) |
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237 nodeindexoffset += actualnamelen |
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238 |
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239 filenamelength = struct.unpack( |
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240 b'!H', self._data[offset : offset + constants.FILENAMESIZE] |
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241 )[0] |
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242 offset += constants.FILENAMESIZE |
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243 |
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244 actualname = self._data[offset : offset + filenamelength] |
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245 offset += filenamelength |
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246 |
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247 if name != actualname: |
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248 raise KeyError( |
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249 b"found file name %s when looking for %s" % (actualname, name) |
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250 ) |
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251 |
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252 # Skip entry list size |
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253 offset += ENTRYCOUNTSIZE |
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254 |
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255 nodelistoffset = offset |
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256 nodelistsize = ( |
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257 size - constants.FILENAMESIZE - filenamelength - ENTRYCOUNTSIZE |
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258 ) |
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259 return ( |
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260 name, |
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261 nodelistoffset, |
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262 nodelistsize, |
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263 nodeindexoffset, |
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264 nodeindexsize, |
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265 ) |
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266 |
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267 def _bisect(self, node, start, end, entrylen): |
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268 # Bisect between start and end to find node |
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269 origstart = start |
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270 startnode = self._index[start : start + NODELENGTH] |
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271 endnode = self._index[end : end + NODELENGTH] |
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272 |
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273 if startnode == node: |
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274 return self._index[start : start + entrylen] |
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275 elif endnode == node: |
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276 return self._index[end : end + entrylen] |
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277 else: |
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278 while start < end - entrylen: |
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279 mid = start + (end - start) // 2 |
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280 mid = mid - ((mid - origstart) % entrylen) |
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281 midnode = self._index[mid : mid + NODELENGTH] |
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282 if midnode == node: |
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283 return self._index[mid : mid + entrylen] |
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284 if node > midnode: |
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285 start = mid |
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286 elif node < midnode: |
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287 end = mid |
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288 return None |
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289 |
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290 def markledger(self, ledger, options=None): |
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291 for filename, node in self: |
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292 ledger.markhistoryentry(self, filename, node) |
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293 |
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294 def cleanup(self, ledger): |
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295 entries = ledger.sources.get(self, []) |
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296 allkeys = set(self) |
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297 repackedkeys = { |
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298 (e.filename, e.node) for e in entries if e.historyrepacked |
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299 } |
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300 |
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301 if len(allkeys - repackedkeys) == 0: |
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302 if self.path not in ledger.created: |
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303 util.unlinkpath(self.indexpath, ignoremissing=True) |
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304 util.unlinkpath(self.packpath, ignoremissing=True) |
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305 |
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306 def __iter__(self): |
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307 for f, n, x, x, x, x in self.iterentries(): |
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308 yield f, n |
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309 |
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310 def iterentries(self): |
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311 # Start at 1 to skip the header |
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312 offset = 1 |
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313 while offset < self.datasize: |
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314 data = self._data |
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315 # <2 byte len> + <filename> |
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316 filenamelen = struct.unpack( |
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317 b'!H', data[offset : offset + constants.FILENAMESIZE] |
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318 )[0] |
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319 offset += constants.FILENAMESIZE |
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320 filename = data[offset : offset + filenamelen] |
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321 offset += filenamelen |
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322 |
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323 revcount = struct.unpack( |
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324 b'!I', data[offset : offset + ENTRYCOUNTSIZE] |
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325 )[0] |
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326 offset += ENTRYCOUNTSIZE |
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327 |
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328 for i in pycompat.xrange(revcount): |
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329 entry = struct.unpack( |
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330 PACKFORMAT, data[offset : offset + PACKENTRYLENGTH] |
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331 ) |
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332 offset += PACKENTRYLENGTH |
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333 |
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334 copyfrom = data[offset : offset + entry[ANC_COPYFROM]] |
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335 offset += entry[ANC_COPYFROM] |
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336 |
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337 yield ( |
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338 filename, |
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339 entry[ANC_NODE], |
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340 entry[ANC_P1NODE], |
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341 entry[ANC_P2NODE], |
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342 entry[ANC_LINKNODE], |
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343 copyfrom, |
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344 ) |
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345 |
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346 self._pagedin += PACKENTRYLENGTH |
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347 |
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348 # If we've read a lot of data from the mmap, free some memory. |
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349 self.freememory() |
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350 |
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351 |
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352 class mutablehistorypack(basepack.mutablebasepack): |
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353 """A class for constructing and serializing a histpack file and index. |
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354 |
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355 A history pack is a pair of files that contain the revision history for |
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356 various file revisions in Mercurial. It contains only revision history (like |
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357 parent pointers and linknodes), not any revision content information. |
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358 |
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359 It consists of two files, with the following format: |
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360 |
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361 .histpack |
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362 The pack itself is a series of file revisions with some basic header |
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363 information on each. |
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364 |
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365 datapack = <version: 1 byte> |
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366 [<filesection>,...] |
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367 filesection = <filename len: 2 byte unsigned int> |
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368 <filename> |
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369 <revision count: 4 byte unsigned int> |
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370 [<revision>,...] |
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371 revision = <node: 20 byte> |
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372 <p1node: 20 byte> |
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373 <p2node: 20 byte> |
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374 <linknode: 20 byte> |
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375 <copyfromlen: 2 byte> |
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376 <copyfrom> |
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377 |
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378 The revisions within each filesection are stored in topological order |
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379 (newest first). If a given entry has a parent from another file (a copy) |
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380 then p1node is the node from the other file, and copyfrom is the |
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381 filepath of the other file. |
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382 |
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383 .histidx |
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384 The index file provides a mapping from filename to the file section in |
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385 the histpack. In V1 it also contains sub-indexes for specific nodes |
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386 within each file. It consists of three parts, the fanout, the file index |
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387 and the node indexes. |
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388 |
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389 The file index is a list of index entries, sorted by filename hash (one |
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390 per file section in the pack). Each entry has: |
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391 |
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392 - node (The 20 byte hash of the filename) |
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393 - pack entry offset (The location of this file section in the histpack) |
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394 - pack content size (The on-disk length of this file section's pack |
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395 data) |
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396 - node index offset (The location of the file's node index in the index |
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397 file) [1] |
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398 - node index size (the on-disk length of this file's node index) [1] |
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399 |
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400 The fanout is a quick lookup table to reduce the number of steps for |
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401 bisecting the index. It is a series of 4 byte pointers to positions |
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402 within the index. It has 2^16 entries, which corresponds to hash |
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403 prefixes [00, 01, 02,..., FD, FE, FF]. Example: the pointer in slot 4F |
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404 points to the index position of the first revision whose node starts |
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405 with 4F. This saves log(2^16) bisect steps. |
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406 |
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407 dataidx = <fanouttable> |
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408 <file count: 8 byte unsigned> [1] |
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409 <fileindex> |
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410 <node count: 8 byte unsigned> [1] |
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411 [<nodeindex>,...] [1] |
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412 fanouttable = [<index offset: 4 byte unsigned int>,...] (2^16 entries) |
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413 |
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414 fileindex = [<file index entry>,...] |
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415 fileindexentry = <node: 20 byte> |
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416 <pack file section offset: 8 byte unsigned int> |
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417 <pack file section size: 8 byte unsigned int> |
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418 <node index offset: 4 byte unsigned int> [1] |
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419 <node index size: 4 byte unsigned int> [1] |
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420 nodeindex = <filename>[<node index entry>,...] [1] |
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421 filename = <filename len : 2 byte unsigned int><filename value> [1] |
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422 nodeindexentry = <node: 20 byte> [1] |
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423 <pack file node offset: 8 byte unsigned int> [1] |
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424 |
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425 [1]: new in version 1. |
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426 """ |
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427 |
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428 INDEXSUFFIX = INDEXSUFFIX |
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429 PACKSUFFIX = PACKSUFFIX |
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430 |
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431 SUPPORTED_VERSIONS = [2] |
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432 |
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433 def __init__(self, ui, packpath, version=2): |
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434 super(mutablehistorypack, self).__init__(ui, packpath, version=version) |
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435 self.files = {} |
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436 self.entrylocations = {} |
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437 self.fileentries = {} |
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438 |
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439 self.INDEXFORMAT = INDEXFORMAT2 |
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440 self.INDEXENTRYLENGTH = INDEXENTRYLENGTH2 |
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441 |
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442 self.NODEINDEXFORMAT = NODEINDEXFORMAT |
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443 self.NODEINDEXENTRYLENGTH = NODEINDEXENTRYLENGTH |
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444 |
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445 def add(self, filename, node, p1, p2, linknode, copyfrom): |
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446 copyfrom = copyfrom or b'' |
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447 copyfromlen = struct.pack(b'!H', len(copyfrom)) |
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448 self.fileentries.setdefault(filename, []).append( |
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449 (node, p1, p2, linknode, copyfromlen, copyfrom) |
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450 ) |
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451 |
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452 def _write(self): |
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453 for filename in sorted(self.fileentries): |
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454 entries = self.fileentries[filename] |
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455 sectionstart = self.packfp.tell() |
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456 |
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457 # Write the file section content |
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458 entrymap = {e[0]: e for e in entries} |
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459 |
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460 def parentfunc(node): |
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461 x, p1, p2, x, x, x = entrymap[node] |
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462 parents = [] |
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463 if p1 != sha1nodeconstants.nullid: |
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464 parents.append(p1) |
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465 if p2 != sha1nodeconstants.nullid: |
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466 parents.append(p2) |
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467 return parents |
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468 |
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469 sortednodes = list( |
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470 reversed( |
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471 shallowutil.sortnodes((e[0] for e in entries), parentfunc) |
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472 ) |
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473 ) |
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474 |
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475 # Write the file section header |
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476 self.writeraw( |
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477 b"%s%s%s" |
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478 % ( |
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479 struct.pack(b'!H', len(filename)), |
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480 filename, |
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481 struct.pack(b'!I', len(sortednodes)), |
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482 ) |
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483 ) |
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484 |
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485 sectionlen = constants.FILENAMESIZE + len(filename) + 4 |
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486 |
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487 rawstrings = [] |
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488 |
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489 # Record the node locations for the index |
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490 locations = self.entrylocations.setdefault(filename, {}) |
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491 offset = sectionstart + sectionlen |
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492 for node in sortednodes: |
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493 locations[node] = offset |
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494 raw = b'%s%s%s%s%s%s' % entrymap[node] |
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495 rawstrings.append(raw) |
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496 offset += len(raw) |
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497 |
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498 rawdata = b''.join(rawstrings) |
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499 sectionlen += len(rawdata) |
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500 |
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501 self.writeraw(rawdata) |
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502 |
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503 # Record metadata for the index |
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504 self.files[filename] = (sectionstart, sectionlen) |
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505 node = hashutil.sha1(filename).digest() |
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506 self.entries[node] = node |
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507 |
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508 def close(self, ledger=None): |
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509 if self._closed: |
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510 return |
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511 |
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512 self._write() |
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513 |
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514 return super(mutablehistorypack, self).close(ledger=ledger) |
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515 |
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516 def createindex(self, nodelocations, indexoffset): |
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517 fileindexformat = self.INDEXFORMAT |
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518 fileindexlength = self.INDEXENTRYLENGTH |
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519 nodeindexformat = self.NODEINDEXFORMAT |
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520 nodeindexlength = self.NODEINDEXENTRYLENGTH |
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521 |
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522 files = ( |
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523 (hashutil.sha1(filename).digest(), filename, offset, size) |
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524 for filename, (offset, size) in pycompat.iteritems(self.files) |
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525 ) |
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526 files = sorted(files) |
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527 |
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528 # node index is after file index size, file index, and node index size |
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529 indexlensize = struct.calcsize(b'!Q') |
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530 nodeindexoffset = ( |
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531 indexoffset |
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532 + indexlensize |
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533 + (len(files) * fileindexlength) |
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534 + indexlensize |
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535 ) |
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536 |
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537 fileindexentries = [] |
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538 nodeindexentries = [] |
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539 nodecount = 0 |
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540 for namehash, filename, offset, size in files: |
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541 # File section index |
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542 nodelocations = self.entrylocations[filename] |
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543 |
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544 nodeindexsize = len(nodelocations) * nodeindexlength |
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545 |
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546 rawentry = struct.pack( |
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547 fileindexformat, |
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548 namehash, |
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549 offset, |
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550 size, |
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551 nodeindexoffset, |
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552 nodeindexsize, |
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553 ) |
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554 # Node index |
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555 nodeindexentries.append( |
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556 struct.pack(constants.FILENAMESTRUCT, len(filename)) + filename |
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557 ) |
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558 nodeindexoffset += constants.FILENAMESIZE + len(filename) |
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559 |
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560 for node, location in sorted(pycompat.iteritems(nodelocations)): |
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561 nodeindexentries.append( |
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562 struct.pack(nodeindexformat, node, location) |
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563 ) |
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564 nodecount += 1 |
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565 |
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566 nodeindexoffset += len(nodelocations) * nodeindexlength |
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567 |
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568 fileindexentries.append(rawentry) |
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569 |
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570 nodecountraw = struct.pack(b'!Q', nodecount) |
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571 return ( |
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572 b''.join(fileindexentries) |
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573 + nodecountraw |
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574 + b''.join(nodeindexentries) |
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575 ) |