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annotate mercurial/metadata.py @ 45611:e5578dbe36cb

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changing-files: add the ability to track merged files too The set of merged files is used when doing changeset centric copy tracing (cf `is_merged` in `mercurial/copies.py`. So tracking (and persisting) this set will be useful. We start with adding the attribute on the new object. Differential Revision: https://phab.mercurial-scm.org/D9087
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Thu, 24 Sep 2020 09:50:09 +0200
parents 3d5b2b8e93fd
children ddcee0b0fd67
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1 # metadata.py -- code related to various metadata computation and access.
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2 #
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3 # Copyright 2019 Google, Inc <martinvonz@google.com>
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4 # Copyright 2020 Pierre-Yves David <pierre-yves.david@octobus.net>
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8 from __future__ import absolute_import, print_function
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9
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10 import multiprocessing
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11
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12 from . import (
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13 error,
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14 node,
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15 pycompat,
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16 util,
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17 )
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18
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19 from .revlogutils import (
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20 flagutil as sidedataflag,
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21 sidedata as sidedatamod,
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22 )
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23
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24
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25 class ChangingFiles(object):
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26 """A class recording the changes made to a file by a changeset
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27
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28 Actions performed on files are gathered into 3 sets:
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29
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30 - added: files actively added in the changeset.
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31 - merged: files whose history got merged
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32 - removed: files removed in the revision
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33 - touched: files affected by the merge
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34
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35 and copies information is held by 2 mappings
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36
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37 - copied_from_p1: {"<new-name>": "<source-name-in-p1>"} mapping for copies
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38 - copied_from_p2: {"<new-name>": "<source-name-in-p2>"} mapping for copies
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39
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40 See their inline help for details.
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41 """
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42
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43 def __init__(
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44 self,
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45 touched=None,
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46 added=None,
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47 removed=None,
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48 merged=None,
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49 p1_copies=None,
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50 p2_copies=None,
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51 ):
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52 self._added = set(() if added is None else added)
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53 self._merged = set(() if merged is None else merged)
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54 self._removed = set(() if removed is None else removed)
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55 self._touched = set(() if touched is None else touched)
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56 self._touched.update(self._added)
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57 self._touched.update(self._merged)
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58 self._touched.update(self._removed)
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59 self._p1_copies = dict(() if p1_copies is None else p1_copies)
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60 self._p2_copies = dict(() if p2_copies is None else p2_copies)
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61
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62 def __eq__(self, other):
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63 return (
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64 self.added == other.added
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65 and self.merged == other.merged
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66 and self.removed == other.removed
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67 and self.touched == other.touched
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68 and self.copied_from_p1 == other.copied_from_p1
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69 and self.copied_from_p2 == other.copied_from_p2
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70 )
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71
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72 @property
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73 def added(self):
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74 """files actively added in the changeset
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75
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76 Any file present in that revision that was absent in all the changeset's
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77 parents.
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78
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79 In case of merge, this means a file absent in one of the parents but
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80 existing in the other will *not* be contained in this set. (They were
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81 added by an ancestor)
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82 """
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83 return frozenset(self._added)
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84
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85 def mark_added(self, filename):
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86 self._added.add(filename)
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87 self._touched.add(filename)
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88
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89 def update_added(self, filenames):
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90 for f in filenames:
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91 self.mark_added(f)
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92
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93 @property
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94 def merged(self):
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95 """files actively merged during a merge
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96
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97 Any modified files which had modification on both size that needed merging.
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98
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99 In this case a new filenode was created and it has two parents.
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100 """
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101 return frozenset(self._merged)
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102
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103 def mark_merged(self, filename):
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104 self._merged.add(filename)
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105 self._touched.add(filename)
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106
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107 def update_merged(self, filenames):
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108 for f in filenames:
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109 self.mark_merged(f)
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110
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111 @property
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112 def removed(self):
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113 """files actively removed by the changeset
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114
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115 In case of merge this will only contain the set of files removing "new"
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116 content. For any file absent in the current changeset:
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117
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118 a) If the file exists in both parents, it is clearly "actively" removed
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119 by this changeset.
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120
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121 b) If a file exists in only one parent and in none of the common
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122 ancestors, then the file was newly added in one of the merged branches
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123 and then got "actively" removed.
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124
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125 c) If a file exists in only one parent and at least one of the common
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126 ancestors using the same filenode, then the file was unchanged on one
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127 side and deleted on the other side. The merge "passively" propagated
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128 that deletion, but didn't "actively" remove the file. In this case the
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129 file is *not* included in the `removed` set.
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130
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131 d) If a file exists in only one parent and at least one of the common
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132 ancestors using a different filenode, then the file was changed on one
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133 side and removed on the other side. The merge process "actively"
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134 decided to drop the new change and delete the file. Unlike in the
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135 previous case, (c), the file included in the `removed` set.
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136
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137 Summary table for merge:
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138
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139 case | exists in parents | exists in gca || removed
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140 (a) | both | * || yes
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141 (b) | one | none || yes
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142 (c) | one | same filenode || no
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143 (d) | one | new filenode || yes
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144 """
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145 return frozenset(self._removed)
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146
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147 def mark_removed(self, filename):
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148 self._removed.add(filename)
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149 self._touched.add(filename)
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150
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151 def update_removed(self, filenames):
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152 for f in filenames:
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153 self.mark_removed(f)
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154
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155 @property
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156 def touched(self):
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157 """files either actively modified, added or removed"""
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158 return frozenset(self._touched)
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159
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160 def mark_touched(self, filename):
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161 self._touched.add(filename)
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162
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163 def update_touched(self, filenames):
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164 for f in filenames:
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165 self.mark_touched(f)
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166
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167 @property
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168 def copied_from_p1(self):
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169 return self._p1_copies.copy()
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170
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171 def mark_copied_from_p1(self, source, dest):
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172 self._p1_copies[dest] = source
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173
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174 def update_copies_from_p1(self, copies):
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175 for dest, source in copies.items():
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176 self.mark_copied_from_p1(source, dest)
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177
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178 @property
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179 def copied_from_p2(self):
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180 return self._p2_copies.copy()
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181
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182 def mark_copied_from_p2(self, source, dest):
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183 self._p2_copies[dest] = source
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184
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185 def update_copies_from_p2(self, copies):
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186 for dest, source in copies.items():
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187 self.mark_copied_from_p2(source, dest)
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188
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189
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190 def computechangesetfilesadded(ctx):
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191 """return the list of files added in a changeset
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192 """
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193 added = []
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194 for f in ctx.files():
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195 if not any(f in p for p in ctx.parents()):
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196 added.append(f)
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197 return added
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198
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199
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200 def get_removal_filter(ctx, x=None):
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201 """return a function to detect files "wrongly" detected as `removed`
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202
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203 When a file is removed relative to p1 in a merge, this
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204 function determines whether the absence is due to a
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205 deletion from a parent, or whether the merge commit
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206 itself deletes the file. We decide this by doing a
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207 simplified three way merge of the manifest entry for
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208 the file. There are two ways we decide the merge
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209 itself didn't delete a file:
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210 - neither parent (nor the merge) contain the file
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211 - exactly one parent contains the file, and that
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212 parent has the same filelog entry as the merge
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213 ancestor (or all of them if there two). In other
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214 words, that parent left the file unchanged while the
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215 other one deleted it.
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216 One way to think about this is that deleting a file is
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217 similar to emptying it, so the list of changed files
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218 should be similar either way. The computation
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219 described above is not done directly in _filecommit
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220 when creating the list of changed files, however
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221 it does something very similar by comparing filelog
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222 nodes.
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223 """
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224
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225 if x is not None:
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226 p1, p2, m1, m2 = x
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227 else:
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228 p1 = ctx.p1()
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229 p2 = ctx.p2()
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230 m1 = p1.manifest()
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231 m2 = p2.manifest()
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232
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233 @util.cachefunc
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234 def mas():
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235 p1n = p1.node()
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236 p2n = p2.node()
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237 cahs = ctx.repo().changelog.commonancestorsheads(p1n, p2n)
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238 if not cahs:
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239 cahs = [node.nullrev]
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240 return [ctx.repo()[r].manifest() for r in cahs]
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241
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242 def deletionfromparent(f):
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243 if f in m1:
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244 return f not in m2 and all(
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245 f in ma and ma.find(f) == m1.find(f) for ma in mas()
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246 )
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247 elif f in m2:
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248 return all(f in ma and ma.find(f) == m2.find(f) for ma in mas())
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249 else:
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250 return True
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251
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252 return deletionfromparent
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253
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254
44940
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255 def computechangesetfilesremoved(ctx):
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256 """return the list of files removed in a changeset
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257 """
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258 removed = []
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259 for f in ctx.files():
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260 if f not in ctx:
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261 removed.append(f)
44942
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262 if removed:
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263 rf = get_removal_filter(ctx)
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264 removed = [r for r in removed if not rf(r)]
44940
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265 return removed
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266
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267
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268 def computechangesetcopies(ctx):
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269 """return the copies data for a changeset
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270
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271 The copies data are returned as a pair of dictionnary (p1copies, p2copies).
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272
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273 Each dictionnary are in the form: `{newname: oldname}`
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274 """
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275 p1copies = {}
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276 p2copies = {}
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277 p1 = ctx.p1()
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278 p2 = ctx.p2()
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279 narrowmatch = ctx._repo.narrowmatch()
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280 for dst in ctx.files():
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281 if not narrowmatch(dst) or dst not in ctx:
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parents:
diff changeset
282 continue
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283 copied = ctx[dst].renamed()
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diff changeset
284 if not copied:
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diff changeset
285 continue
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parents:
diff changeset
286 src, srcnode = copied
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diff changeset
287 if src in p1 and p1[src].filenode() == srcnode:
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288 p1copies[dst] = src
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289 elif src in p2 and p2[src].filenode() == srcnode:
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diff changeset
290 p2copies[dst] = src
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diff changeset
291 return p1copies, p2copies
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292
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293
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294 def encodecopies(files, copies):
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295 items = []
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296 for i, dst in enumerate(files):
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297 if dst in copies:
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diff changeset
298 items.append(b'%d\0%s' % (i, copies[dst]))
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299 if len(items) != len(copies):
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300 raise error.ProgrammingError(
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301 b'some copy targets missing from file list'
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302 )
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parents:
diff changeset
303 return b"\n".join(items)
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diff changeset
304
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parents:
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305
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306 def decodecopies(files, data):
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parents:
diff changeset
307 try:
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diff changeset
308 copies = {}
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parents:
diff changeset
309 if not data:
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diff changeset
310 return copies
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diff changeset
311 for l in data.split(b'\n'):
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312 strindex, src = l.split(b'\0')
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313 i = int(strindex)
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314 dst = files[i]
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diff changeset
315 copies[dst] = src
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316 return copies
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diff changeset
317 except (ValueError, IndexError):
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diff changeset
318 # Perhaps someone had chosen the same key name (e.g. "p1copies") and
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319 # used different syntax for the value.
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320 return None
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parents:
diff changeset
321
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diff changeset
322
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diff changeset
323 def encodefileindices(files, subset):
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diff changeset
324 subset = set(subset)
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diff changeset
325 indices = []
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diff changeset
326 for i, f in enumerate(files):
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parents:
diff changeset
327 if f in subset:
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parents:
diff changeset
328 indices.append(b'%d' % i)
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diff changeset
329 return b'\n'.join(indices)
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parents:
diff changeset
330
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parents:
diff changeset
331
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diff changeset
332 def decodefileindices(files, data):
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parents:
diff changeset
333 try:
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parents:
diff changeset
334 subset = []
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parents:
diff changeset
335 if not data:
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parents:
diff changeset
336 return subset
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diff changeset
337 for strindex in data.split(b'\n'):
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parents:
diff changeset
338 i = int(strindex)
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parents:
diff changeset
339 if i < 0 or i >= len(files):
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parents:
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340 return None
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parents:
diff changeset
341 subset.append(files[i])
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342 return subset
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diff changeset
343 except (ValueError, IndexError):
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diff changeset
344 # Perhaps someone had chosen the same key name (e.g. "added") and
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diff changeset
345 # used different syntax for the value.
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parents:
diff changeset
346 return None
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parents:
diff changeset
347
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diff changeset
348
45569
64d18e9e8508 sidedata: rename `encode_copies_sidedata` to `encode_files_sidedata`
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 45507
diff changeset
349 def encode_files_sidedata(files):
45325
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diff changeset
350 sortedfiles = sorted(files.touched)
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diff changeset
351 sidedata = {}
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diff changeset
352 p1copies = files.copied_from_p1
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parents: 45323
diff changeset
353 if p1copies:
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parents: 45323
diff changeset
354 p1copies = encodecopies(sortedfiles, p1copies)
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diff changeset
355 sidedata[sidedatamod.SD_P1COPIES] = p1copies
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parents: 45323
diff changeset
356 p2copies = files.copied_from_p2
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parents: 45323
diff changeset
357 if p2copies:
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parents: 45323
diff changeset
358 p2copies = encodecopies(sortedfiles, p2copies)
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parents: 45323
diff changeset
359 sidedata[sidedatamod.SD_P2COPIES] = p2copies
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parents: 45323
diff changeset
360 filesadded = files.added
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parents: 45323
diff changeset
361 if filesadded:
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parents: 45323
diff changeset
362 filesadded = encodefileindices(sortedfiles, filesadded)
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parents: 45323
diff changeset
363 sidedata[sidedatamod.SD_FILESADDED] = filesadded
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parents: 45323
diff changeset
364 filesremoved = files.removed
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parents: 45323
diff changeset
365 if filesremoved:
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parents: 45323
diff changeset
366 filesremoved = encodefileindices(sortedfiles, filesremoved)
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367 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved
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368 if not sidedata:
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369 sidedata = None
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370 return sidedata
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371
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372
45571
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373 def decode_files_sidedata(changelogrevision, sidedata):
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374 """Return a ChangingFiles instance from a changelogrevision using sidata
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375 """
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diff changeset
376 touched = changelogrevision.files
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377
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diff changeset
378 rawindices = sidedata.get(sidedatamod.SD_FILESADDED)
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diff changeset
379 added = decodefileindices(touched, rawindices)
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380
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diff changeset
381 rawindices = sidedata.get(sidedatamod.SD_FILESREMOVED)
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diff changeset
382 removed = decodefileindices(touched, rawindices)
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diff changeset
383
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diff changeset
384 rawcopies = sidedata.get(sidedatamod.SD_P1COPIES)
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parents: 45569
diff changeset
385 p1_copies = decodecopies(touched, rawcopies)
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parents: 45569
diff changeset
386
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diff changeset
387 rawcopies = sidedata.get(sidedatamod.SD_P2COPIES)
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diff changeset
388 p2_copies = decodecopies(touched, rawcopies)
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diff changeset
389
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diff changeset
390 return ChangingFiles(
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diff changeset
391 touched=touched,
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diff changeset
392 added=added,
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diff changeset
393 removed=removed,
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diff changeset
394 p1_copies=p1_copies,
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diff changeset
395 p2_copies=p2_copies,
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diff changeset
396 )
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diff changeset
397
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diff changeset
398
44940
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399 def _getsidedata(srcrepo, rev):
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400 ctx = srcrepo[rev]
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parents:
diff changeset
401 filescopies = computechangesetcopies(ctx)
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parents:
diff changeset
402 filesadded = computechangesetfilesadded(ctx)
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parents:
diff changeset
403 filesremoved = computechangesetfilesremoved(ctx)
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parents:
diff changeset
404 sidedata = {}
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parents:
diff changeset
405 if any([filescopies, filesadded, filesremoved]):
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parents:
diff changeset
406 sortedfiles = sorted(ctx.files())
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parents:
diff changeset
407 p1copies, p2copies = filescopies
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parents:
diff changeset
408 p1copies = encodecopies(sortedfiles, p1copies)
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parents:
diff changeset
409 p2copies = encodecopies(sortedfiles, p2copies)
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parents:
diff changeset
410 filesadded = encodefileindices(sortedfiles, filesadded)
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parents:
diff changeset
411 filesremoved = encodefileindices(sortedfiles, filesremoved)
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parents:
diff changeset
412 if p1copies:
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parents:
diff changeset
413 sidedata[sidedatamod.SD_P1COPIES] = p1copies
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parents:
diff changeset
414 if p2copies:
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parents:
diff changeset
415 sidedata[sidedatamod.SD_P2COPIES] = p2copies
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diff changeset
416 if filesadded:
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parents:
diff changeset
417 sidedata[sidedatamod.SD_FILESADDED] = filesadded
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diff changeset
418 if filesremoved:
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parents:
diff changeset
419 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved
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parents:
diff changeset
420 return sidedata
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diff changeset
421
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parents:
diff changeset
422
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diff changeset
423 def getsidedataadder(srcrepo, destrepo):
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parents:
diff changeset
424 use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade')
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parents:
diff changeset
425 if pycompat.iswindows or not use_w:
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parents:
diff changeset
426 return _get_simple_sidedata_adder(srcrepo, destrepo)
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parents:
diff changeset
427 else:
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parents:
diff changeset
428 return _get_worker_sidedata_adder(srcrepo, destrepo)
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parents:
diff changeset
429
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parents:
diff changeset
430
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diff changeset
431 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens):
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parents:
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432 """The function used by worker precomputing sidedata
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433
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diff changeset
434 It read an input queue containing revision numbers
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parents:
diff changeset
435 It write in an output queue containing (rev, <sidedata-map>)
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parents:
diff changeset
436
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diff changeset
437 The `None` input value is used as a stop signal.
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parents:
diff changeset
438
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parents:
diff changeset
439 The `tokens` semaphore is user to avoid having too many unprocessed
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parents:
diff changeset
440 entries. The workers needs to acquire one token before fetching a task.
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parents:
diff changeset
441 They will be released by the consumer of the produced data.
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parents:
diff changeset
442 """
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parents:
diff changeset
443 tokens.acquire()
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parents:
diff changeset
444 rev = revs_queue.get()
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parents:
diff changeset
445 while rev is not None:
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parents:
diff changeset
446 data = _getsidedata(srcrepo, rev)
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parents:
diff changeset
447 sidedata_queue.put((rev, data))
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parents:
diff changeset
448 tokens.acquire()
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parents:
diff changeset
449 rev = revs_queue.get()
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parents:
diff changeset
450 # processing of `None` is completed, release the token.
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parents:
diff changeset
451 tokens.release()
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parents:
diff changeset
452
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parents:
diff changeset
453
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parents:
diff changeset
454 BUFF_PER_WORKER = 50
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parents:
diff changeset
455
4c1d39215034 metadata: move computation related to files touched in a dedicated module
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parents:
diff changeset
456
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parents:
diff changeset
457 def _get_worker_sidedata_adder(srcrepo, destrepo):
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parents:
diff changeset
458 """The parallel version of the sidedata computation
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parents:
diff changeset
459
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parents:
diff changeset
460 This code spawn a pool of worker that precompute a buffer of sidedata
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parents:
diff changeset
461 before we actually need them"""
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parents:
diff changeset
462 # avoid circular import copies -> scmutil -> worker -> copies
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parents:
diff changeset
463 from . import worker
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parents:
diff changeset
464
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parents:
diff changeset
465 nbworkers = worker._numworkers(srcrepo.ui)
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parents:
diff changeset
466
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parents:
diff changeset
467 tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER)
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parents:
diff changeset
468 revsq = multiprocessing.Queue()
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parents:
diff changeset
469 sidedataq = multiprocessing.Queue()
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parents:
diff changeset
470
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parents:
diff changeset
471 assert srcrepo.filtername is None
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parents:
diff changeset
472 # queue all tasks beforehand, revision numbers are small and it make
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Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
diff changeset
473 # synchronisation simpler
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Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
diff changeset
474 #
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parents:
diff changeset
475 # Since the computation for each node can be quite expensive, the overhead
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Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
diff changeset
476 # of using a single queue is not revelant. In practice, most computation
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Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
diff changeset
477 # are fast but some are very expensive and dominate all the other smaller
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Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
diff changeset
478 # cost.
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Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
diff changeset
479 for r in srcrepo.changelog.revs():
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Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
diff changeset
480 revsq.put(r)
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parents:
diff changeset
481 # queue the "no more tasks" markers
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parents:
diff changeset
482 for i in range(nbworkers):
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Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
diff changeset
483 revsq.put(None)
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parents:
diff changeset
484
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parents:
diff changeset
485 allworkers = []
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parents:
diff changeset
486 for i in range(nbworkers):
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parents:
diff changeset
487 args = (srcrepo, revsq, sidedataq, tokens)
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488 w = multiprocessing.Process(target=_sidedata_worker, args=args)
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489 allworkers.append(w)
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490 w.start()
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491
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492 # dictionnary to store results for revision higher than we one we are
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493 # looking for. For example, if we need the sidedatamap for 42, and 43 is
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494 # received, when shelve 43 for later use.
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495 staging = {}
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496
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497 def sidedata_companion(revlog, rev):
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498 sidedata = {}
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499 if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog
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500 # Is the data previously shelved ?
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501 sidedata = staging.pop(rev, None)
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502 if sidedata is None:
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503 # look at the queued result until we find the one we are lookig
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504 # for (shelve the other ones)
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505 r, sidedata = sidedataq.get()
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506 while r != rev:
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507 staging[r] = sidedata
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508 r, sidedata = sidedataq.get()
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509 tokens.release()
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510 return False, (), sidedata
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511
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512 return sidedata_companion
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513
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514
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515 def _get_simple_sidedata_adder(srcrepo, destrepo):
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516 """The simple version of the sidedata computation
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517
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518 It just compute it in the same thread on request"""
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519
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520 def sidedatacompanion(revlog, rev):
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521 sidedata = {}
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522 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog
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523 sidedata = _getsidedata(srcrepo, rev)
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524 return False, (), sidedata
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525
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526 return sidedatacompanion
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527
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528
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529 def getsidedataremover(srcrepo, destrepo):
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530 def sidedatacompanion(revlog, rev):
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531 f = ()
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532 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog
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533 if revlog.flags(rev) & sidedataflag.REVIDX_SIDEDATA:
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534 f = (
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535 sidedatamod.SD_P1COPIES,
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536 sidedatamod.SD_P2COPIES,
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537 sidedatamod.SD_FILESADDED,
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538 sidedatamod.SD_FILESREMOVED,
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539 )
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540 return False, f, {}
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541
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542 return sidedatacompanion