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annotate hgext/fastannotate/__init__.py @ 39878:3e896b51aa5d

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storageutil: move metadata parsing and packing from revlog (API) Parsing and writing of revision text metadata is likely identical across storage backends. Let's move the code out of revlog so we don't need to import the revlog module in order to use it. Differential Revision: https://phab.mercurial-scm.org/D4754
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 24 Sep 2018 14:31:31 -0700
parents 57d4754e44b8
children c841e8855cd3
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1 # Copyright 2016-present Facebook. All Rights Reserved.
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2 #
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3 # fastannotate: faster annotate implementation using linelog
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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 """yet another annotate implementation that might be faster (EXPERIMENTAL)
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8
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9 The fastannotate extension provides a 'fastannotate' command that makes
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10 use of the linelog data structure as a cache layer and is expected to
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11 be faster than the vanilla 'annotate' if the cache is present.
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12
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13 In most cases, fastannotate requires a setup that mainbranch is some pointer
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14 that always moves forward, to be most efficient.
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15
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16 Using fastannotate together with linkrevcache would speed up building the
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17 annotate cache greatly. Run "debugbuildlinkrevcache" before
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18 "debugbuildannotatecache".
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19
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20 ::
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21
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22 [fastannotate]
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23 # specify the main branch head. the internal linelog will only contain
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24 # the linear (ignoring p2) "mainbranch". since linelog cannot move
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25 # backwards without a rebuild, this should be something that always moves
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26 # forward, usually it is "master" or "@".
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27 mainbranch = master
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28
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29 # fastannotate supports different modes to expose its feature.
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30 # a list of combination:
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31 # - fastannotate: expose the feature via the "fastannotate" command which
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32 # deals with everything in a most efficient way, and provides extra
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33 # features like --deleted etc.
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34 # - fctx: replace fctx.annotate implementation. note:
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35 # a. it is less efficient than the "fastannotate" command
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36 # b. it will make it practically impossible to access the old (disk
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37 # side-effect free) annotate implementation
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38 # c. it implies "hgweb".
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39 # - hgweb: replace hgweb's annotate implementation. conflict with "fctx".
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40 # (default: fastannotate)
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41 modes = fastannotate
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42
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43 # default format when no format flags are used (default: number)
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44 defaultformat = changeset, user, date
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45
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46 # serve the annotate cache via wire protocol (default: False)
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47 # tip: the .hg/fastannotate directory is portable - can be rsynced
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48 server = True
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49
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50 # build annotate cache on demand for every client request (default: True)
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51 # disabling it could make server response faster, useful when there is a
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52 # cronjob building the cache.
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53 serverbuildondemand = True
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54
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55 # update local annotate cache from remote on demand
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56 client = False
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57
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58 # path to use when connecting to the remote server (default: default)
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59 remotepath = default
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60
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61 # minimal length of the history of a file required to fetch linelog from
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62 # the server. (default: 10)
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63 clientfetchthreshold = 10
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64
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65 # use flock instead of the file existence lock
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66 # flock may not work well on some network filesystems, but they avoid
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67 # creating and deleting files frequently, which is faster when updating
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68 # the annotate cache in batch. if you have issues with this option, set it
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69 # to False. (default: True if flock is supported, False otherwise)
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70 useflock = True
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71
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72 # for "fctx" mode, always follow renames regardless of command line option.
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73 # this is a BC with the original command but will reduced the space needed
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74 # for annotate cache, and is useful for client-server setup since the
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75 # server will only provide annotate cache with default options (i.e. with
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76 # follow). do not affect "fastannotate" mode. (default: True)
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77 forcefollow = True
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78
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79 # for "fctx" mode, always treat file as text files, to skip the "isbinary"
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80 # check. this is consistent with the "fastannotate" command and could help
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81 # to avoid a file fetch if remotefilelog is used. (default: True)
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82 forcetext = True
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83
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84 # use unfiltered repo for better performance.
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85 unfilteredrepo = True
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86
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87 # sacrifice correctness in some corner cases for performance. it does not
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88 # affect the correctness of the annotate cache being built. the option
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89 # is experimental and may disappear in the future (default: False)
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90 perfhack = True
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91 """
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92
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93 # TODO from import:
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94 # * `branch` is probably the wrong term, throughout the code.
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95 #
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96 # * replace the fastannotate `modes` configuration with a collection
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97 # of booleans.
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98 #
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99 # * Use the templater instead of bespoke formatting
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100 #
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101 # * rename the config knob for updating the local cache from a remote server
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102 #
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103 # * move `flock` based locking to a common area
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104 #
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105 # * revise wireprotocol for sharing annotate files
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106 #
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107 # * figure out a sensible default for `mainbranch` (with the caveat
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108 # that we probably also want to figure out a better term than
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109 # `branch`, see above)
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110 #
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111 # * format changes to the revmap file (maybe use length-encoding
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112 # instead of null-terminated file paths at least?)
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113 from __future__ import absolute_import
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114
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115 from mercurial.i18n import _
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116 from mercurial import (
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117 configitems,
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118 error as hgerror,
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119 localrepo,
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120 registrar,
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121 )
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122
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123 from . import (
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124 commands,
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125 context,
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126 protocol,
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127 )
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128
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129 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
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130 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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131 # be specifying the version(s) of Mercurial they are tested with, or
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132 # leave the attribute unspecified.
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133 testedwith = 'ships-with-hg-core'
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134
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135 cmdtable = commands.cmdtable
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136
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137 configtable = {}
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138 configitem = registrar.configitem(configtable)
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139
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140 configitem('fastannotate', 'modes', default=['fastannotate'])
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141 configitem('fastannotate', 'server', default=False)
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142 configitem('fastannotate', 'useflock', default=configitems.dynamicdefault)
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143 configitem('fastannotate', 'client', default=False)
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144 configitem('fastannotate', 'unfilteredrepo', default=True)
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145 configitem('fastannotate', 'defaultformat', default=['number'])
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146 configitem('fastannotate', 'perfhack', default=False)
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147 configitem('fastannotate', 'mainbranch')
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148 configitem('fastannotate', 'forcetext', default=True)
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149 configitem('fastannotate', 'forcefollow', default=True)
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150 configitem('fastannotate', 'clientfetchthreshold', default=10)
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151 configitem('fastannotate', 'serverbuildondemand', default=True)
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152 configitem('fastannotate', 'remotepath', default='default')
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153
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154 def _flockavailable():
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155 try:
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156 import fcntl
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157 fcntl.flock
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158 except StandardError:
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159 return False
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160 else:
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161 return True
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162
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163 def uisetup(ui):
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164 modes = set(ui.configlist('fastannotate', 'modes'))
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165 if 'fctx' in modes:
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166 modes.discard('hgweb')
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167 for name in modes:
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168 if name == 'fastannotate':
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169 commands.registercommand()
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170 elif name == 'hgweb':
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171 from . import support
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172 support.replacehgwebannotate()
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173 elif name == 'fctx':
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174 from . import support
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175 support.replacefctxannotate()
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176 commands.wrapdefault()
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177 else:
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178 raise hgerror.Abort(_('fastannotate: invalid mode: %s') % name)
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179
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180 if ui.configbool('fastannotate', 'server'):
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181 protocol.serveruisetup(ui)
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182
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183 if ui.configbool('fastannotate', 'useflock', _flockavailable()):
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184 context.pathhelper.lock = context.pathhelper._lockflock
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185
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186 def extsetup(ui):
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187 # fastannotate has its own locking, without depending on repo lock
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188 # TODO: avoid mutating this unless the specific repo has it enabled
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189 localrepo.localrepository._wlockfreeprefix.add('fastannotate/')
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190
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191 def reposetup(ui, repo):
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192 if ui.configbool('fastannotate', 'client'):
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193 protocol.clientreposetup(ui, repo)