Mercurial > hg-stable
annotate hgext/remotefilelog/datapack.py @ 43105:649d3ac37a12
py3: define and use pycompat.iteritems() for hgext/
.iteritems() -> .items() is the last source transform being performed.
But it is also the most widely used.
This commit adds a pycompat.iteritems symbol and imports it in place
of .iteritems() for usage in hgext/. I chose to stop at just hgext/
because the patch will be large and it is an easy boundary to stop at
since we can disable source transformation on a per-package basis.
There are places where the type does implement items() and we could
call items() directly. However, this would require critical thought
and I thought it would be easier to just blindly change the code. We
know which call sites need to be audited in the future because they
have "pycompat.iteritems."
With this change, we no longer perform source transformation on
hgext!
Differential Revision: https://phab.mercurial-scm.org/D7014
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 06 Oct 2019 19:25:18 -0400 |
parents | 687b865b95ad |
children | 9d2b2df2c2ba |
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 import zlib |
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5 |
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6 from mercurial.node import hex, nullid |
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7 from mercurial.i18n import _ |
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8 from mercurial import ( |
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9 pycompat, |
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10 util, |
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11 ) |
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12 from . import ( |
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13 basepack, |
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14 constants, |
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15 shallowutil, |
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16 ) |
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17 |
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18 NODELENGTH = 20 |
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19 |
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20 # The indicator value in the index for a fulltext entry. |
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21 FULLTEXTINDEXMARK = -1 |
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22 NOBASEINDEXMARK = -2 |
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23 |
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24 INDEXSUFFIX = b'.dataidx' |
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25 PACKSUFFIX = b'.datapack' |
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26 |
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27 |
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28 class datapackstore(basepack.basepackstore): |
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29 INDEXSUFFIX = INDEXSUFFIX |
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30 PACKSUFFIX = PACKSUFFIX |
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31 |
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32 def __init__(self, ui, path): |
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33 super(datapackstore, self).__init__(ui, path) |
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34 |
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35 def getpack(self, path): |
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36 return datapack(path) |
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37 |
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38 def get(self, name, node): |
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39 raise RuntimeError(b"must use getdeltachain with datapackstore") |
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40 |
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41 def getmeta(self, name, node): |
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42 for pack in self.packs: |
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43 try: |
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44 return pack.getmeta(name, node) |
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45 except KeyError: |
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46 pass |
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47 |
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48 for pack in self.refresh(): |
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49 try: |
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50 return pack.getmeta(name, node) |
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51 except KeyError: |
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52 pass |
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53 |
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54 raise KeyError((name, hex(node))) |
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55 |
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56 def getdelta(self, name, node): |
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57 for pack in self.packs: |
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58 try: |
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59 return pack.getdelta(name, node) |
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60 except KeyError: |
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61 pass |
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62 |
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63 for pack in self.refresh(): |
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64 try: |
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65 return pack.getdelta(name, node) |
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66 except KeyError: |
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67 pass |
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68 |
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69 raise KeyError((name, hex(node))) |
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70 |
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71 def getdeltachain(self, name, node): |
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72 for pack in self.packs: |
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73 try: |
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74 return pack.getdeltachain(name, node) |
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75 except KeyError: |
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76 pass |
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77 |
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78 for pack in self.refresh(): |
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79 try: |
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80 return pack.getdeltachain(name, node) |
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81 except KeyError: |
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82 pass |
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83 |
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84 raise KeyError((name, hex(node))) |
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85 |
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86 def add(self, name, node, data): |
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87 raise RuntimeError(b"cannot add to datapackstore") |
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88 |
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89 |
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90 class datapack(basepack.basepack): |
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91 INDEXSUFFIX = INDEXSUFFIX |
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92 PACKSUFFIX = PACKSUFFIX |
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93 |
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94 # Format is <node><delta offset><pack data offset><pack data size> |
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95 # See the mutabledatapack doccomment for more details. |
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96 INDEXFORMAT = b'!20siQQ' |
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97 INDEXENTRYLENGTH = 40 |
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98 |
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99 SUPPORTED_VERSIONS = [2] |
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100 |
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101 def getmissing(self, keys): |
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102 missing = [] |
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103 for name, node in keys: |
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104 value = self._find(node) |
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105 if not value: |
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106 missing.append((name, node)) |
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107 |
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108 return missing |
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109 |
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110 def get(self, name, node): |
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111 raise RuntimeError( |
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112 b"must use getdeltachain with datapack (%s:%s)" % (name, hex(node)) |
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113 ) |
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114 |
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115 def getmeta(self, name, node): |
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116 value = self._find(node) |
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117 if value is None: |
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118 raise KeyError((name, hex(node))) |
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119 |
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120 node, deltabaseoffset, offset, size = value |
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121 rawentry = self._data[offset : offset + size] |
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122 |
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123 # see docstring of mutabledatapack for the format |
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124 offset = 0 |
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125 offset += struct.unpack_from(b'!H', rawentry, offset)[0] + 2 # filename |
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126 offset += 40 # node, deltabase node |
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127 offset += struct.unpack_from(b'!Q', rawentry, offset)[0] + 8 # delta |
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128 |
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129 metalen = struct.unpack_from(b'!I', rawentry, offset)[0] |
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130 offset += 4 |
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131 |
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132 meta = shallowutil.parsepackmeta(rawentry[offset : offset + metalen]) |
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133 |
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134 return meta |
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135 |
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136 def getdelta(self, name, node): |
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137 value = self._find(node) |
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138 if value is None: |
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139 raise KeyError((name, hex(node))) |
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140 |
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141 node, deltabaseoffset, offset, size = value |
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142 entry = self._readentry(offset, size, getmeta=True) |
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143 filename, node, deltabasenode, delta, meta = entry |
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144 |
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145 # If we've read a lot of data from the mmap, free some memory. |
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146 self.freememory() |
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147 |
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148 return delta, filename, deltabasenode, meta |
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149 |
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150 def getdeltachain(self, name, node): |
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151 value = self._find(node) |
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152 if value is None: |
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153 raise KeyError((name, hex(node))) |
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154 |
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155 params = self.params |
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156 |
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157 # Precompute chains |
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158 chain = [value] |
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159 deltabaseoffset = value[1] |
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160 entrylen = self.INDEXENTRYLENGTH |
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161 while ( |
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162 deltabaseoffset != FULLTEXTINDEXMARK |
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163 and deltabaseoffset != NOBASEINDEXMARK |
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164 ): |
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165 loc = params.indexstart + deltabaseoffset |
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166 value = struct.unpack( |
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167 self.INDEXFORMAT, self._index[loc : loc + entrylen] |
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168 ) |
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169 deltabaseoffset = value[1] |
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170 chain.append(value) |
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171 |
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172 # Read chain data |
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173 deltachain = [] |
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174 for node, deltabaseoffset, offset, size in chain: |
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175 filename, node, deltabasenode, delta = self._readentry(offset, size) |
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176 deltachain.append((filename, node, filename, deltabasenode, delta)) |
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177 |
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178 # If we've read a lot of data from the mmap, free some memory. |
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179 self.freememory() |
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180 |
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181 return deltachain |
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182 |
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183 def _readentry(self, offset, size, getmeta=False): |
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184 rawentry = self._data[offset : offset + size] |
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185 self._pagedin += len(rawentry) |
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186 |
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187 # <2 byte len> + <filename> |
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188 lengthsize = 2 |
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189 filenamelen = struct.unpack(b'!H', rawentry[:2])[0] |
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190 filename = rawentry[lengthsize : lengthsize + filenamelen] |
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191 |
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192 # <20 byte node> + <20 byte deltabase> |
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193 nodestart = lengthsize + filenamelen |
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194 deltabasestart = nodestart + NODELENGTH |
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195 node = rawentry[nodestart:deltabasestart] |
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196 deltabasenode = rawentry[deltabasestart : deltabasestart + NODELENGTH] |
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197 |
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198 # <8 byte len> + <delta> |
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199 deltastart = deltabasestart + NODELENGTH |
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200 rawdeltalen = rawentry[deltastart : deltastart + 8] |
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201 deltalen = struct.unpack(b'!Q', rawdeltalen)[0] |
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202 |
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203 delta = rawentry[deltastart + 8 : deltastart + 8 + deltalen] |
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204 delta = self._decompress(delta) |
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205 |
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206 if getmeta: |
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207 metastart = deltastart + 8 + deltalen |
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208 metalen = struct.unpack_from(b'!I', rawentry, metastart)[0] |
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209 |
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210 rawmeta = rawentry[metastart + 4 : metastart + 4 + metalen] |
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211 meta = shallowutil.parsepackmeta(rawmeta) |
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212 return filename, node, deltabasenode, delta, meta |
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213 else: |
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214 return filename, node, deltabasenode, delta |
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215 |
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216 def _decompress(self, data): |
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217 return zlib.decompress(data) |
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218 |
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219 def add(self, name, node, data): |
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220 raise RuntimeError(b"cannot add to datapack (%s:%s)" % (name, node)) |
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221 |
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222 def _find(self, node): |
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223 params = self.params |
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224 fanoutkey = struct.unpack( |
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225 params.fanoutstruct, node[: params.fanoutprefix] |
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226 )[0] |
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227 fanout = self._fanouttable |
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228 |
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229 start = fanout[fanoutkey] + params.indexstart |
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230 indexend = self._indexend |
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231 |
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232 # Scan forward to find the first non-same entry, which is the upper |
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233 # bound. |
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234 for i in pycompat.xrange(fanoutkey + 1, params.fanoutcount): |
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235 end = fanout[i] + params.indexstart |
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236 if end != start: |
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237 break |
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238 else: |
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239 end = indexend |
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240 |
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241 # Bisect between start and end to find node |
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242 index = self._index |
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243 startnode = index[start : start + NODELENGTH] |
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244 endnode = index[end : end + NODELENGTH] |
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245 entrylen = self.INDEXENTRYLENGTH |
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246 if startnode == node: |
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247 entry = index[start : start + entrylen] |
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248 elif endnode == node: |
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249 entry = index[end : end + entrylen] |
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250 else: |
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251 while start < end - entrylen: |
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252 mid = start + (end - start) // 2 |
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253 mid = mid - ((mid - params.indexstart) % entrylen) |
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254 midnode = index[mid : mid + NODELENGTH] |
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255 if midnode == node: |
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256 entry = index[mid : mid + entrylen] |
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257 break |
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258 if node > midnode: |
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259 start = mid |
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260 elif node < midnode: |
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261 end = mid |
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262 else: |
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263 return None |
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264 |
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265 return struct.unpack(self.INDEXFORMAT, entry) |
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266 |
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267 def markledger(self, ledger, options=None): |
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268 for filename, node in self: |
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269 ledger.markdataentry(self, filename, node) |
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270 |
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271 def cleanup(self, ledger): |
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272 entries = ledger.sources.get(self, []) |
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273 allkeys = set(self) |
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274 repackedkeys = set( |
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275 (e.filename, e.node) for e in entries if e.datarepacked or e.gced |
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276 ) |
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277 |
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278 if len(allkeys - repackedkeys) == 0: |
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279 if self.path not in ledger.created: |
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280 util.unlinkpath(self.indexpath, ignoremissing=True) |
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281 util.unlinkpath(self.packpath, ignoremissing=True) |
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282 |
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283 def __iter__(self): |
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284 for f, n, deltabase, deltalen in self.iterentries(): |
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285 yield f, n |
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286 |
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287 def iterentries(self): |
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288 # Start at 1 to skip the header |
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289 offset = 1 |
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290 data = self._data |
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291 while offset < self.datasize: |
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292 oldoffset = offset |
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293 |
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294 # <2 byte len> + <filename> |
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295 filenamelen = struct.unpack(b'!H', data[offset : offset + 2])[0] |
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296 offset += 2 |
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297 filename = data[offset : offset + filenamelen] |
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298 offset += filenamelen |
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299 |
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300 # <20 byte node> |
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301 node = data[offset : offset + constants.NODESIZE] |
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302 offset += constants.NODESIZE |
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303 # <20 byte deltabase> |
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304 deltabase = data[offset : offset + constants.NODESIZE] |
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305 offset += constants.NODESIZE |
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306 |
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307 # <8 byte len> + <delta> |
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308 rawdeltalen = data[offset : offset + 8] |
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309 deltalen = struct.unpack(b'!Q', rawdeltalen)[0] |
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310 offset += 8 |
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311 |
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312 # TODO(augie): we should store a header that is the |
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313 # uncompressed size. |
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314 uncompressedlen = len( |
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315 self._decompress(data[offset : offset + deltalen]) |
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316 ) |
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317 offset += deltalen |
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318 |
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319 # <4 byte len> + <metadata-list> |
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320 metalen = struct.unpack_from(b'!I', data, offset)[0] |
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321 offset += 4 + metalen |
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322 |
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323 yield (filename, node, deltabase, uncompressedlen) |
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324 |
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325 # If we've read a lot of data from the mmap, free some memory. |
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326 self._pagedin += offset - oldoffset |
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327 if self.freememory(): |
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328 data = self._data |
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329 |
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330 |
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331 class mutabledatapack(basepack.mutablebasepack): |
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332 """A class for constructing and serializing a datapack file and index. |
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333 |
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334 A datapack is a pair of files that contain the revision contents for various |
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335 file revisions in Mercurial. It contains only revision contents (like file |
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336 contents), not any history information. |
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337 |
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338 It consists of two files, with the following format. All bytes are in |
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339 network byte order (big endian). |
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340 |
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341 .datapack |
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342 The pack itself is a series of revision deltas with some basic header |
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343 information on each. A revision delta may be a fulltext, represented by |
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344 a deltabasenode equal to the nullid. |
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345 |
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346 datapack = <version: 1 byte> |
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347 [<revision>,...] |
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348 revision = <filename len: 2 byte unsigned int> |
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349 <filename> |
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350 <node: 20 byte> |
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351 <deltabasenode: 20 byte> |
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352 <delta len: 8 byte unsigned int> |
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353 <delta> |
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354 <metadata-list len: 4 byte unsigned int> [1] |
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355 <metadata-list> [1] |
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356 metadata-list = [<metadata-item>, ...] |
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357 metadata-item = <metadata-key: 1 byte> |
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358 <metadata-value len: 2 byte unsigned> |
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359 <metadata-value> |
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360 |
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361 metadata-key could be METAKEYFLAG or METAKEYSIZE or other single byte |
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362 value in the future. |
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363 |
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364 .dataidx |
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365 The index file consists of two parts, the fanout and the index. |
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366 |
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367 The index is a list of index entries, sorted by node (one per revision |
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368 in the pack). Each entry has: |
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369 |
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370 - node (The 20 byte node of the entry; i.e. the commit hash, file node |
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371 hash, etc) |
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372 - deltabase index offset (The location in the index of the deltabase for |
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373 this entry. The deltabase is the next delta in |
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374 the chain, with the chain eventually |
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375 terminating in a full-text, represented by a |
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376 deltabase offset of -1. This lets us compute |
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377 delta chains from the index, then do |
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378 sequential reads from the pack if the revision |
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379 are nearby on disk.) |
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380 - pack entry offset (The location of this entry in the datapack) |
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381 - pack content size (The on-disk length of this entry's pack data) |
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382 |
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383 The fanout is a quick lookup table to reduce the number of steps for |
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384 bisecting the index. It is a series of 4 byte pointers to positions |
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385 within the index. It has 2^16 entries, which corresponds to hash |
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386 prefixes [0000, 0001,..., FFFE, FFFF]. Example: the pointer in slot |
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387 4F0A points to the index position of the first revision whose node |
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388 starts with 4F0A. This saves log(2^16)=16 bisect steps. |
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389 |
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390 dataidx = <fanouttable> |
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391 <index> |
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392 fanouttable = [<index offset: 4 byte unsigned int>,...] (2^16 entries) |
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393 index = [<index entry>,...] |
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394 indexentry = <node: 20 byte> |
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395 <deltabase location: 4 byte signed int> |
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396 <pack entry offset: 8 byte unsigned int> |
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397 <pack entry size: 8 byte unsigned int> |
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398 |
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399 [1]: new in version 1. |
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400 """ |
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401 |
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402 INDEXSUFFIX = INDEXSUFFIX |
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403 PACKSUFFIX = PACKSUFFIX |
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404 |
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405 # v[01] index format: <node><delta offset><pack data offset><pack data size> |
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406 INDEXFORMAT = datapack.INDEXFORMAT |
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407 INDEXENTRYLENGTH = datapack.INDEXENTRYLENGTH |
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408 |
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409 # v1 has metadata support |
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410 SUPPORTED_VERSIONS = [2] |
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411 |
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412 def _compress(self, data): |
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413 return zlib.compress(data) |
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414 |
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415 def add(self, name, node, deltabasenode, delta, metadata=None): |
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416 # metadata is a dict, ex. {METAKEYFLAG: flag} |
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417 if len(name) > 2 ** 16: |
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418 raise RuntimeError(_(b"name too long %s") % name) |
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419 if len(node) != 20: |
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420 raise RuntimeError(_(b"node should be 20 bytes %s") % node) |
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421 |
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422 if node in self.entries: |
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423 # The revision has already been added |
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424 return |
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425 |
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426 # TODO: allow configurable compression |
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427 delta = self._compress(delta) |
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428 |
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429 rawdata = b''.join( |
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430 ( |
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431 struct.pack(b'!H', len(name)), # unsigned 2 byte int |
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432 name, |
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433 node, |
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434 deltabasenode, |
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435 struct.pack(b'!Q', len(delta)), # unsigned 8 byte int |
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436 delta, |
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437 ) |
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438 ) |
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439 |
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440 # v1 support metadata |
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441 rawmeta = shallowutil.buildpackmeta(metadata) |
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442 rawdata += struct.pack(b'!I', len(rawmeta)) # unsigned 4 byte |
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443 rawdata += rawmeta |
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444 |
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445 offset = self.packfp.tell() |
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446 |
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447 size = len(rawdata) |
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448 |
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449 self.entries[node] = (deltabasenode, offset, size) |
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450 |
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451 self.writeraw(rawdata) |
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452 |
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453 def createindex(self, nodelocations, indexoffset): |
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454 entries = sorted( |
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455 (n, db, o, s) for n, (db, o, s) in pycompat.iteritems(self.entries) |
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456 ) |
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457 |
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458 rawindex = b'' |
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459 fmt = self.INDEXFORMAT |
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460 for node, deltabase, offset, size in entries: |
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461 if deltabase == nullid: |
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462 deltabaselocation = FULLTEXTINDEXMARK |
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463 else: |
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464 # Instead of storing the deltabase node in the index, let's |
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465 # store a pointer directly to the index entry for the deltabase. |
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466 deltabaselocation = nodelocations.get( |
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467 deltabase, NOBASEINDEXMARK |
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468 ) |
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469 |
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470 entry = struct.pack(fmt, node, deltabaselocation, offset, size) |
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471 rawindex += entry |
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472 |
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473 return rawindex |