annotate mercurial/filelog.py @ 47120:7109a38830c9

dirstate-tree: Fold "tracked descendants" counter update in main walk For the purpose of implementing `has_tracked_dir` (which means "has tracked descendants) without an expensive sub-tree traversal, we maintaing a counter of tracked descendants on each "directory" node of the tree-shaped dirstate. Before this changeset, mutating or inserting a node at a given path would involve: * Walking the tree from root through ancestors to find the node or the spot where to insert it * Looking at the previous node if any to decide what counter update is needed * Performing any node mutation * Walking the tree *again* to update counters in ancestor nodes When profiling `hg status` on a large repo, this second walk takes times while loading a the dirstate from disk. It turns out we have enough information to decide before he first tree walk what counter update is needed. This changeset merges the two walks, gaining ~10% of the total time for `hg update` (in the same hyperfine benchmark as the previous changeset). --- Profiling was done by compiling with this `.cargo/config`: [profile.release] debug = true then running with: py-spy record -r 500 -n -o /tmp/hg.json --format speedscope -- \ ./hg status -R $REPO --config experimental.dirstate-tree.in-memory=1 then visualizing the recorded JSON file in https://www.speedscope.app/ Differential Revision: https://phab.mercurial-scm.org/D10554
author Simon Sapin <simon.sapin@octobus.net>
date Fri, 30 Apr 2021 14:22:14 +0200
parents 64cd1496bb70
children 8a1a51d31e85
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1 # filelog.py - file history class for mercurial
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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
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8 from __future__ import absolute_import
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9
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10 from .i18n import _
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11 from .node import nullrev
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12 from . import (
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13 error,
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14 revlog,
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15 )
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16 from .interfaces import (
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17 repository,
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18 util as interfaceutil,
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19 )
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20 from .utils import storageutil
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21 from .revlogutils import (
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22 constants as revlog_constants,
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23 )
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24
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25
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26 @interfaceutil.implementer(repository.ifilestorage)
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27 class filelog(object):
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28 def __init__(self, opener, path):
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29 self._revlog = revlog.revlog(
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30 opener,
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31 # XXX should use the unencoded path
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32 target=(revlog_constants.KIND_FILELOG, path),
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33 indexfile=b'/'.join((b'data', path + b'.i')),
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34 censorable=True,
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35 )
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36 # Full name of the user visible file, relative to the repository root.
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37 # Used by LFS.
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38 self._revlog.filename = path
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39 self.nullid = self._revlog.nullid
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40
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41 def __len__(self):
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42 return len(self._revlog)
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43
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44 def __iter__(self):
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45 return self._revlog.__iter__()
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46
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47 def hasnode(self, node):
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48 if node in (self.nullid, nullrev):
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49 return False
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50
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51 try:
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52 self._revlog.rev(node)
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53 return True
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54 except (TypeError, ValueError, IndexError, error.LookupError):
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55 return False
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56
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57 def revs(self, start=0, stop=None):
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58 return self._revlog.revs(start=start, stop=stop)
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59
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60 def parents(self, node):
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61 return self._revlog.parents(node)
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62
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63 def parentrevs(self, rev):
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64 return self._revlog.parentrevs(rev)
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65
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66 def rev(self, node):
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67 return self._revlog.rev(node)
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68
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69 def node(self, rev):
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70 return self._revlog.node(rev)
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71
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72 def lookup(self, node):
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73 return storageutil.fileidlookup(
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74 self._revlog, node, self._revlog.indexfile
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75 )
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76
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77 def linkrev(self, rev):
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78 return self._revlog.linkrev(rev)
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79
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80 def commonancestorsheads(self, node1, node2):
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81 return self._revlog.commonancestorsheads(node1, node2)
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82
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83 # Used by dagop.blockdescendants().
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84 def descendants(self, revs):
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85 return self._revlog.descendants(revs)
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86
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87 def heads(self, start=None, stop=None):
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88 return self._revlog.heads(start, stop)
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89
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90 # Used by hgweb, children extension.
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91 def children(self, node):
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92 return self._revlog.children(node)
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93
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94 def iscensored(self, rev):
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95 return self._revlog.iscensored(rev)
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96
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97 def revision(self, node, _df=None, raw=False):
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98 return self._revlog.revision(node, _df=_df, raw=raw)
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99
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100 def rawdata(self, node, _df=None):
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101 return self._revlog.rawdata(node, _df=_df)
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102
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103 def emitrevisions(
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104 self,
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105 nodes,
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106 nodesorder=None,
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107 revisiondata=False,
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108 assumehaveparentrevisions=False,
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109 deltamode=repository.CG_DELTAMODE_STD,
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110 sidedata_helpers=None,
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111 ):
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112 return self._revlog.emitrevisions(
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113 nodes,
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114 nodesorder=nodesorder,
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115 revisiondata=revisiondata,
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116 assumehaveparentrevisions=assumehaveparentrevisions,
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117 deltamode=deltamode,
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118 sidedata_helpers=sidedata_helpers,
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119 )
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120
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121 def addrevision(
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122 self,
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123 revisiondata,
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124 transaction,
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125 linkrev,
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126 p1,
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127 p2,
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128 node=None,
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129 flags=revlog.REVIDX_DEFAULT_FLAGS,
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130 cachedelta=None,
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131 ):
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132 return self._revlog.addrevision(
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133 revisiondata,
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134 transaction,
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135 linkrev,
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parents: 42814
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136 p1,
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137 p2,
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138 node=node,
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139 flags=flags,
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140 cachedelta=cachedelta,
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141 )
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142
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143 def addgroup(
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144 self,
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145 deltas,
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146 linkmapper,
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147 transaction,
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148 addrevisioncb=None,
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149 duplicaterevisioncb=None,
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150 maybemissingparents=False,
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151 ):
40389
1b183edbb68e repository: teach addgroup() to receive data with missing parents
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152 if maybemissingparents:
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153 raise error.Abort(
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154 _(
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155 b'revlog storage does not support missing '
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156 b'parents write mode'
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157 )
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158 )
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159
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160 return self._revlog.addgroup(
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161 deltas,
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162 linkmapper,
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Joerg Sonnenberger <joerg@bec.de>
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163 transaction,
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164 addrevisioncb=addrevisioncb,
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165 duplicaterevisioncb=duplicaterevisioncb,
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166 )
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167
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168 def getstrippoint(self, minlink):
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169 return self._revlog.getstrippoint(minlink)
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170
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171 def strip(self, minlink, transaction):
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172 return self._revlog.strip(minlink, transaction)
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173
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174 def censorrevision(self, tr, node, tombstone=b''):
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175 return self._revlog.censorrevision(tr, node, tombstone=tombstone)
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176
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177 def files(self):
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178 return self._revlog.files()
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179
0
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180 def read(self, node):
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181 return storageutil.filtermetadata(self.revision(node))
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182
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183 def add(self, text, meta, transaction, link, p1=None, p2=None):
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184 if meta or text.startswith(b'\1\n'):
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185 text = storageutil.packmeta(meta, text)
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186 rev = self.addrevision(text, transaction, link, p1, p2)
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187 return self.node(rev)
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188
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189 def renamed(self, node):
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190 return storageutil.filerevisioncopied(self, node)
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191
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192 def size(self, rev):
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193 """return the size of a given revision"""
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194
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195 # for revisions with renames, we have to go the slow way
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196 node = self.node(rev)
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197 if self.renamed(node):
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198 return len(self.read(node))
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Mike Edgar <adgar@google.com>
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199 if self.iscensored(rev):
22597
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Mike Edgar <adgar@google.com>
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200 return 0
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201
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202 # XXX if self.read(node).startswith("\1\n"), this returns (size+4)
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203 return self._revlog.size(rev)
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204
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parents: 2859
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205 def cmp(self, node, text):
11539
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206 """compare text with a given file revision
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207
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208 returns True if text is different than what is stored.
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209 """
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1470183068b8 storageutil: invert logic of file data comparison
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210 return not storageutil.filedataequivalent(self, node, text)
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211
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212 def verifyintegrity(self, state):
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213 return self._revlog.verifyintegrity(state)
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parents: 39785
diff changeset
214
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215 def storageinfo(
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diff changeset
216 self,
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217 exclusivefiles=False,
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218 sharedfiles=False,
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219 revisionscount=False,
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220 trackedsize=False,
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221 storedsize=False,
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parents: 42814
diff changeset
222 ):
39869
14e500b58263 revlog: add method for obtaining storage info (API)
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parents: 39867
diff changeset
223 return self._revlog.storageinfo(
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diff changeset
224 exclusivefiles=exclusivefiles,
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diff changeset
225 sharedfiles=sharedfiles,
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diff changeset
226 revisionscount=revisionscount,
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227 trackedsize=trackedsize,
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228 storedsize=storedsize,
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parents: 42814
diff changeset
229 )
39869
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parents: 39867
diff changeset
230
39783
76f92d208f7a filelog: record what's using attributes
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parents: 39782
diff changeset
231 # TODO these aren't part of the interface and aren't internal methods.
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parents: 39782
diff changeset
232 # Callers should be fixed to not use them.
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diff changeset
233
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parents: 39782
diff changeset
234 # Used by bundlefilelog, unionfilelog.
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diff changeset
235 @property
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37443
diff changeset
236 def indexfile(self):
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37443
diff changeset
237 return self._revlog.indexfile
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37443
diff changeset
238
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37443
diff changeset
239 @indexfile.setter
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37443
diff changeset
240 def indexfile(self, value):
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37443
diff changeset
241 self._revlog.indexfile = value
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242
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parents: 39782
diff changeset
243 # Used by repo upgrade.
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parents: 37443
diff changeset
244 def clone(self, tr, destrevlog, **kwargs):
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parents: 37443
diff changeset
245 if not isinstance(destrevlog, filelog):
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parents: 43076
diff changeset
246 raise error.ProgrammingError(b'expected filelog to clone()')
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247
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37443
diff changeset
248 return self._revlog.clone(tr, destrevlog._revlog, **kwargs)
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249
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250
39765
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parents: 39283
diff changeset
251 class narrowfilelog(filelog):
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diff changeset
252 """Filelog variation to be used with narrow stores."""
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253
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diff changeset
254 def __init__(self, opener, path, narrowmatch):
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parents: 39283
diff changeset
255 super(narrowfilelog, self).__init__(opener, path)
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diff changeset
256 self._narrowmatch = narrowmatch
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257
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parents: 39283
diff changeset
258 def renamed(self, node):
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parents: 39283
diff changeset
259 res = super(narrowfilelog, self).renamed(node)
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260
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parents: 39283
diff changeset
261 # Renames that come from outside the narrowspec are problematic
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parents: 39283
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262 # because we may lack the base text for the rename. This can result
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 39283
diff changeset
263 # in code attempting to walk the ancestry or compute a diff
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 39283
diff changeset
264 # encountering a missing revision. We address this by silently
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 39283
diff changeset
265 # removing rename metadata if the source file is outside the
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parents: 39283
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266 # narrow spec.
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267 #
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parents: 39283
diff changeset
268 # A better solution would be to see if the base revision is available,
3e801ffd7269 filelog: custom filelog to be used with narrow repos
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39283
diff changeset
269 # rather than assuming it isn't.
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 39283
diff changeset
270 #
3e801ffd7269 filelog: custom filelog to be used with narrow repos
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parents: 39283
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271 # An even better solution would be to teach all consumers of rename
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272 # metadata that the base revision may not be available.
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273 #
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274 # TODO consider better ways of doing this.
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275 if res and not self._narrowmatch(res[0]):
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276 return None
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277
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278 return res
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279
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280 def size(self, rev):
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281 # Because we have a custom renamed() that may lie, we need to call
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282 # the base renamed() to report accurate results.
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283 node = self.node(rev)
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284 if super(narrowfilelog, self).renamed(node):
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285 return len(self.read(node))
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286 else:
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287 return super(narrowfilelog, self).size(rev)
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288
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289 def cmp(self, node, text):
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290 # We don't call `super` because narrow parents can be buggy in case of a
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291 # ambiguous dirstate. Always take the slow path until there is a better
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292 # fix, see issue6150.
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293
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294 # Censored files compare against the empty file.
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295 if self.iscensored(self.rev(node)):
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296 return text != b''
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297
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298 return self.read(node) != text