Mercurial > hg
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> |
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date | Fri, 30 Apr 2021 14:22:14 +0200 |
parents | 64cd1496bb70 |
children | 8a1a51d31e85 |
rev | line source |
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1089 | 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 |
10263 | 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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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 ): |
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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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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 |
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180 def read(self, node): |
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181 return storageutil.filtermetadata(self.revision(node)) |
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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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190 return storageutil.filerevisioncopied(self, node) |
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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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199 if self.iscensored(rev): |
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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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205 def cmp(self, node, text): |
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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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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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214 |
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215 def storageinfo( |
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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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222 ): |
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223 return self._revlog.storageinfo( |
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224 exclusivefiles=exclusivefiles, |
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225 sharedfiles=sharedfiles, |
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226 revisionscount=revisionscount, |
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227 trackedsize=trackedsize, |
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228 storedsize=storedsize, |
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229 ) |
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230 |
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231 # TODO these aren't part of the interface and aren't internal methods. |
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232 # Callers should be fixed to not use them. |
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233 |
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234 # Used by bundlefilelog, unionfilelog. |
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235 @property |
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236 def indexfile(self): |
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237 return self._revlog.indexfile |
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238 |
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239 @indexfile.setter |
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240 def indexfile(self, value): |
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241 self._revlog.indexfile = value |
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242 |
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243 # Used by repo upgrade. |
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244 def clone(self, tr, destrevlog, **kwargs): |
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245 if not isinstance(destrevlog, filelog): |
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246 raise error.ProgrammingError(b'expected filelog to clone()') |
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247 |
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248 return self._revlog.clone(tr, destrevlog._revlog, **kwargs) |
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249 |
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250 |
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251 class narrowfilelog(filelog): |
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252 """Filelog variation to be used with narrow stores.""" |
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253 |
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254 def __init__(self, opener, path, narrowmatch): |
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255 super(narrowfilelog, self).__init__(opener, path) |
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256 self._narrowmatch = narrowmatch |
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257 |
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258 def renamed(self, node): |
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259 res = super(narrowfilelog, self).renamed(node) |
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260 |
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261 # Renames that come from outside the narrowspec are problematic |
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262 # because we may lack the base text for the rename. This can result |
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263 # in code attempting to walk the ancestry or compute a diff |
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264 # encountering a missing revision. We address this by silently |
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265 # removing rename metadata if the source file is outside the |
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266 # narrow spec. |
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267 # |
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268 # A better solution would be to see if the base revision is available, |
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269 # rather than assuming it isn't. |
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270 # |
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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 |