Mercurial > hg
annotate hgext/fastannotate/__init__.py @ 41610:d683aca738cd
diffordiffstat: avoid looking up contexts twice
I'm not worried about performance; this is just simpler.
Differential Revision: https://phab.mercurial-scm.org/D5890
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Wed, 06 Feb 2019 22:32:50 -0800 |
parents | 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 (AttributeError, ImportError): |
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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) |