Mercurial > hg
annotate mercurial/metadata.py @ 45734:53c265a6fc83
sidedata: return enough data to set the proper flag in the future
If the revision has information relevant to copy tracing, we need to set a
dedicated flag in revlog. Currently the upgrade process is failing to do so.
Before we teach the upgrade process about flags, we make the information
available where we will needs it.
Differential Revision: https://phab.mercurial-scm.org/D9198
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 13 Oct 2020 03:30:49 +0200 |
parents | 232c88dd89e3 |
children | edf4fa06df94 |
rev | line source |
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1 # coding: utf8 |
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2 # metadata.py -- code related to various metadata computation and access. |
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3 # |
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4 # Copyright 2019 Google, Inc <martinvonz@google.com> |
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5 # Copyright 2020 Pierre-Yves David <pierre-yves.david@octobus.net> |
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6 # |
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7 # This software may be used and distributed according to the terms of the |
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8 # GNU General Public License version 2 or any later version. |
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9 from __future__ import absolute_import, print_function |
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10 |
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11 import multiprocessing |
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12 import struct |
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13 |
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14 from . import ( |
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15 error, |
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16 node, |
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17 pycompat, |
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18 util, |
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19 ) |
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20 |
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21 from .revlogutils import ( |
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22 flagutil as sidedataflag, |
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23 sidedata as sidedatamod, |
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24 ) |
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25 |
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26 |
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27 class ChangingFiles(object): |
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28 """A class recording the changes made to files by a changeset |
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29 |
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30 Actions performed on files are gathered into 3 sets: |
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31 |
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32 - added: files actively added in the changeset. |
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33 - merged: files whose history got merged |
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34 - removed: files removed in the revision |
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35 - salvaged: files that might have been deleted by a merge but were not |
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36 - touched: files affected by the merge |
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37 |
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38 and copies information is held by 2 mappings |
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39 |
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40 - copied_from_p1: {"<new-name>": "<source-name-in-p1>"} mapping for copies |
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41 - copied_from_p2: {"<new-name>": "<source-name-in-p2>"} mapping for copies |
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42 |
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43 See their inline help for details. |
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44 """ |
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45 |
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46 def __init__( |
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47 self, |
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48 touched=None, |
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49 added=None, |
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50 removed=None, |
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51 merged=None, |
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52 salvaged=None, |
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53 p1_copies=None, |
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54 p2_copies=None, |
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55 ): |
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56 self._added = set(() if added is None else added) |
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57 self._merged = set(() if merged is None else merged) |
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58 self._removed = set(() if removed is None else removed) |
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59 self._touched = set(() if touched is None else touched) |
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60 self._salvaged = set(() if salvaged is None else salvaged) |
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61 self._touched.update(self._added) |
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62 self._touched.update(self._merged) |
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63 self._touched.update(self._removed) |
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64 self._p1_copies = dict(() if p1_copies is None else p1_copies) |
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65 self._p2_copies = dict(() if p2_copies is None else p2_copies) |
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66 |
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67 def __eq__(self, other): |
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68 return ( |
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69 self.added == other.added |
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70 and self.merged == other.merged |
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71 and self.removed == other.removed |
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72 and self.salvaged == other.salvaged |
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73 and self.touched == other.touched |
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74 and self.copied_from_p1 == other.copied_from_p1 |
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75 and self.copied_from_p2 == other.copied_from_p2 |
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76 ) |
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77 |
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78 @property |
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79 def has_copies_info(self): |
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80 return bool( |
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81 self.removed |
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82 or self.merged |
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83 or self.salvaged |
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84 or self.copied_from_p1 |
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85 or self.copied_from_p2 |
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86 ) |
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87 |
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88 @util.propertycache |
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89 def added(self): |
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90 """files actively added in the changeset |
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91 |
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92 Any file present in that revision that was absent in all the changeset's |
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93 parents. |
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94 |
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95 In case of merge, this means a file absent in one of the parents but |
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96 existing in the other will *not* be contained in this set. (They were |
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97 added by an ancestor) |
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98 """ |
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99 return frozenset(self._added) |
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100 |
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101 def mark_added(self, filename): |
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102 if 'added' in vars(self): |
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103 del self.added |
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104 self._added.add(filename) |
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105 self.mark_touched(filename) |
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106 |
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107 def update_added(self, filenames): |
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108 for f in filenames: |
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109 self.mark_added(f) |
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110 |
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111 @util.propertycache |
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112 def merged(self): |
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113 """files actively merged during a merge |
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114 |
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115 Any modified files which had modification on both size that needed merging. |
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116 |
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117 In this case a new filenode was created and it has two parents. |
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118 """ |
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119 return frozenset(self._merged) |
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120 |
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121 def mark_merged(self, filename): |
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122 if 'merged' in vars(self): |
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123 del self.merged |
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124 self._merged.add(filename) |
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125 self.mark_touched(filename) |
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126 |
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127 def update_merged(self, filenames): |
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128 for f in filenames: |
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129 self.mark_merged(f) |
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130 |
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131 @util.propertycache |
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132 def removed(self): |
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133 """files actively removed by the changeset |
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134 |
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135 In case of merge this will only contain the set of files removing "new" |
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136 content. For any file absent in the current changeset: |
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137 |
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138 a) If the file exists in both parents, it is clearly "actively" removed |
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139 by this changeset. |
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140 |
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141 b) If a file exists in only one parent and in none of the common |
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142 ancestors, then the file was newly added in one of the merged branches |
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143 and then got "actively" removed. |
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144 |
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145 c) If a file exists in only one parent and at least one of the common |
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146 ancestors using the same filenode, then the file was unchanged on one |
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147 side and deleted on the other side. The merge "passively" propagated |
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148 that deletion, but didn't "actively" remove the file. In this case the |
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149 file is *not* included in the `removed` set. |
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150 |
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151 d) If a file exists in only one parent and at least one of the common |
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152 ancestors using a different filenode, then the file was changed on one |
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153 side and removed on the other side. The merge process "actively" |
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154 decided to drop the new change and delete the file. Unlike in the |
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155 previous case, (c), the file included in the `removed` set. |
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156 |
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157 Summary table for merge: |
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158 |
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159 case | exists in parents | exists in gca || removed |
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160 (a) | both | * || yes |
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161 (b) | one | none || yes |
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162 (c) | one | same filenode || no |
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163 (d) | one | new filenode || yes |
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164 """ |
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165 return frozenset(self._removed) |
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166 |
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167 def mark_removed(self, filename): |
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168 if 'removed' in vars(self): |
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169 del self.removed |
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170 self._removed.add(filename) |
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171 self.mark_touched(filename) |
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172 |
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173 def update_removed(self, filenames): |
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174 for f in filenames: |
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175 self.mark_removed(f) |
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176 |
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177 @util.propertycache |
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178 def salvaged(self): |
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179 """files that might have been deleted by a merge, but still exists. |
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180 |
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181 During a merge, the manifest merging might select some files for |
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182 removal, or for a removed/changed conflict. If at commit time the file |
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183 still exists, its removal was "reverted" and the file is "salvaged" |
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184 """ |
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185 return frozenset(self._salvaged) |
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186 |
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187 def mark_salvaged(self, filename): |
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188 if "salvaged" in vars(self): |
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189 del self.salvaged |
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190 self._salvaged.add(filename) |
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191 self.mark_touched(filename) |
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192 |
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193 def update_salvaged(self, filenames): |
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194 for f in filenames: |
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195 self.mark_salvaged(f) |
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196 |
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197 @util.propertycache |
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198 def touched(self): |
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199 """files either actively modified, added or removed""" |
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200 return frozenset(self._touched) |
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201 |
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202 def mark_touched(self, filename): |
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203 if 'touched' in vars(self): |
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204 del self.touched |
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205 self._touched.add(filename) |
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206 |
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207 def update_touched(self, filenames): |
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208 for f in filenames: |
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209 self.mark_touched(f) |
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210 |
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211 @util.propertycache |
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212 def copied_from_p1(self): |
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213 return self._p1_copies.copy() |
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214 |
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215 def mark_copied_from_p1(self, source, dest): |
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216 if 'copied_from_p1' in vars(self): |
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217 del self.copied_from_p1 |
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218 self._p1_copies[dest] = source |
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219 |
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220 def update_copies_from_p1(self, copies): |
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221 for dest, source in copies.items(): |
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222 self.mark_copied_from_p1(source, dest) |
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223 |
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224 @util.propertycache |
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225 def copied_from_p2(self): |
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226 return self._p2_copies.copy() |
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227 |
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228 def mark_copied_from_p2(self, source, dest): |
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229 if 'copied_from_p2' in vars(self): |
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230 del self.copied_from_p2 |
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231 self._p2_copies[dest] = source |
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232 |
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233 def update_copies_from_p2(self, copies): |
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234 for dest, source in copies.items(): |
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235 self.mark_copied_from_p2(source, dest) |
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236 |
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237 |
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238 def compute_all_files_changes(ctx): |
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239 """compute the files changed by a revision""" |
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240 p1 = ctx.p1() |
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241 p2 = ctx.p2() |
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242 if p1.rev() == node.nullrev and p2.rev() == node.nullrev: |
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243 return _process_root(ctx) |
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244 elif p1.rev() != node.nullrev and p2.rev() == node.nullrev: |
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245 return _process_linear(p1, ctx) |
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246 elif p1.rev() == node.nullrev and p2.rev() != node.nullrev: |
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247 # In the wild, one can encounter changeset where p1 is null but p2 is not |
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248 return _process_linear(p1, ctx, parent=2) |
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249 elif p1.rev() == p2.rev(): |
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250 # In the wild, one can encounter such "non-merge" |
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251 return _process_linear(p1, ctx) |
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252 else: |
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253 return _process_merge(p1, p2, ctx) |
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254 |
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255 |
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256 def _process_root(ctx): |
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257 """compute the appropriate changed files for a changeset with no parents |
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258 """ |
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259 # Simple, there was nothing before it, so everything is added. |
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260 md = ChangingFiles() |
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261 manifest = ctx.manifest() |
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262 for filename in manifest: |
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263 md.mark_added(filename) |
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264 return md |
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265 |
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266 |
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267 def _process_linear(parent_ctx, children_ctx, parent=1): |
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268 """compute the appropriate changed files for a changeset with a single parent |
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269 """ |
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270 md = ChangingFiles() |
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271 parent_manifest = parent_ctx.manifest() |
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272 children_manifest = children_ctx.manifest() |
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273 |
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274 copies_candidate = [] |
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275 |
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276 for filename, d in parent_manifest.diff(children_manifest).items(): |
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277 if d[1][0] is None: |
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278 # no filenode for the "new" value, file is absent |
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279 md.mark_removed(filename) |
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280 else: |
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281 copies_candidate.append(filename) |
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282 if d[0][0] is None: |
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283 # not filenode for the "old" value file was absent |
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284 md.mark_added(filename) |
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285 else: |
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286 # filenode for both "old" and "new" |
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287 md.mark_touched(filename) |
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288 |
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289 if parent == 1: |
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290 copied = md.mark_copied_from_p1 |
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291 elif parent == 2: |
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292 copied = md.mark_copied_from_p2 |
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293 else: |
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294 assert False, "bad parent value %d" % parent |
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295 |
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296 for filename in copies_candidate: |
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297 copy_info = children_ctx[filename].renamed() |
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298 if copy_info: |
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299 source, srcnode = copy_info |
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300 copied(source, filename) |
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301 |
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302 return md |
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303 |
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304 |
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305 def _process_merge(p1_ctx, p2_ctx, ctx): |
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306 """compute the appropriate changed files for a changeset with two parents |
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307 |
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308 This is a more advance case. The information we need to record is summarise |
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309 in the following table: |
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310 |
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311 ┌──────────────┬──────────────┬──────────────┬──────────────┬──────────────┐ |
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312 │ diff ╲ diff │ ø │ (Some, None) │ (None, Some) │ (Some, Some) │ |
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313 │ p2 ╲ p1 │ │ │ │ │ |
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314 ├──────────────┼──────────────┼──────────────┼──────────────┼──────────────┤ |
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315 │ │ │🄱 No Changes │🄳 No Changes │ │ |
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316 │ ø │🄰 No Changes │ OR │ OR │🄵 No Changes │ |
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317 │ │ │🄲 Deleted[1] │🄴 Salvaged[2]│ [3] │ |
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318 ├──────────────┼──────────────┼──────────────┼──────────────┼──────────────┤ |
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319 │ │🄶 No Changes │ │ │ │ |
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320 │ (Some, None) │ OR │🄻 Deleted │ ø │ ø │ |
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321 │ │🄷 Deleted[1] │ │ │ │ |
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322 ├──────────────┼──────────────┼──────────────┼──────────────┼──────────────┤ |
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323 │ │🄸 No Changes │ │ │ │ |
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324 │ (None, Some) │ OR │ ø │🄼 Added │🄽 Merged │ |
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325 │ │🄹 Salvaged[2]│ │ (copied?) │ (copied?) │ |
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326 ├──────────────┼──────────────┼──────────────┼──────────────┼──────────────┤ |
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327 │ │ │ │ │ │ |
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328 │ (Some, Some) │🄺 No Changes │ ø │🄾 Merged │🄿 Merged │ |
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329 │ │ [3] │ │ (copied?) │ (copied?) │ |
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330 └──────────────┴──────────────┴──────────────┴──────────────┴──────────────┘ |
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331 |
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332 Special case [1]: |
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333 |
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334 The situation is: |
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335 - parent-A: file exists, |
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336 - parent-B: no file, |
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337 - working-copy: no file. |
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338 |
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339 Detecting a "deletion" will depend on the presence of actual change on |
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340 the "parent-A" branch: |
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341 |
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342 Subcase 🄱 or 🄶 : if the state of the file in "parent-A" is unchanged |
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343 compared to the merge ancestors, then parent-A branch left the file |
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344 untouched while parent-B deleted it. We simply apply the change from |
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345 "parent-B" branch the file was automatically dropped. |
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346 The result is: |
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347 - file is not recorded as touched by the merge. |
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348 |
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349 Subcase 🄲 or 🄷 : otherwise, the change from parent-A branch were explicitly dropped and |
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350 the file was "deleted again". From a user perspective, the message |
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351 about "locally changed" while "remotely deleted" (or the other way |
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352 around) was issued and the user chose to deleted the file. |
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353 The result: |
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354 - file is recorded as touched by the merge. |
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355 |
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356 |
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357 Special case [2]: |
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358 |
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359 The situation is: |
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360 - parent-A: no file, |
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361 - parent-B: file, |
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362 - working-copy: file (same content as parent-B). |
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363 |
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364 There are three subcases depending on the ancestors contents: |
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365 |
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366 - A) the file is missing in all ancestors, |
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367 - B) at least one ancestor has the file with filenode ≠ from parent-B, |
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368 - C) all ancestors use the same filenode as parent-B, |
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369 |
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370 Subcase (A) is the simpler, nothing happend on parent-A side while |
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371 parent-B added it. |
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372 |
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373 The result: |
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374 - the file is not marked as touched by the merge. |
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375 |
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376 Subcase (B) is the counter part of "Special case [1]", the file was |
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377 modified on parent-B side, while parent-A side deleted it. However this |
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378 time, the conflict was solved by keeping the file (and its |
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379 modification). We consider the file as "salvaged". |
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380 |
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381 The result: |
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382 - the file is marked as "salvaged" by the merge. |
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383 |
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384 Subcase (C) is subtle variation of the case above. In this case, the |
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385 file in unchanged on the parent-B side and actively removed on the |
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386 parent-A side. So the merge machinery correctly decide it should be |
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387 removed. However, the file was explicitly restored to its parent-B |
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388 content before the merge was commited. The file is be marked |
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389 as salvaged too. From the merge result perspective, this is similar to |
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390 Subcase (B), however from the merge resolution perspective they differ |
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391 since in (C), there was some conflict not obvious solution to the |
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392 merge (That got reversed) |
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393 |
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394 Special case [3]: |
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395 |
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396 The situation is: |
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397 - parent-A: file, |
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398 - parent-B: file (different filenode as parent-A), |
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399 - working-copy: file (same filenode as parent-B). |
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400 |
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401 This case is in theory much simple, for this to happens, this mean the |
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402 filenode in parent-A is purely replacing the one in parent-B (either a |
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403 descendant, or a full new file history, see changeset). So the merge |
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404 introduce no changes, and the file is not affected by the merge... |
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405 |
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406 However, in the wild it is possible to find commit with the above is not |
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407 True. For example repository have some commit where the *new* node is an |
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408 ancestor of the node in parent-A, or where parent-A and parent-B are two |
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409 branches of the same file history, yet not merge-filenode were created |
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410 (while the "merge" should have led to a "modification"). |
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411 |
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412 Detecting such cases (and not recording the file as modified) would be a |
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413 nice bonus. However do not any of this yet. |
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414 """ |
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415 |
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416 md = ChangingFiles() |
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417 |
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418 m = ctx.manifest() |
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419 p1m = p1_ctx.manifest() |
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420 p2m = p2_ctx.manifest() |
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421 diff_p1 = p1m.diff(m) |
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422 diff_p2 = p2m.diff(m) |
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423 |
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424 cahs = ctx.repo().changelog.commonancestorsheads( |
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425 p1_ctx.node(), p2_ctx.node() |
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426 ) |
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427 if not cahs: |
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428 cahs = [node.nullrev] |
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429 mas = [ctx.repo()[r].manifest() for r in cahs] |
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430 |
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431 copy_candidates = [] |
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432 |
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433 # Dealing with case 🄰 happens automatically. Since there are no entry in |
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434 # d1 nor d2, we won't iterate on it ever. |
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435 |
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436 # Iteration over d1 content will deal with all cases, but the one in the |
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437 # first column of the table. |
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438 for filename, d1 in diff_p1.items(): |
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439 |
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440 d2 = diff_p2.pop(filename, None) |
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441 |
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442 if d2 is None: |
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443 # this deal with the first line of the table. |
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444 _process_other_unchanged(md, mas, filename, d1) |
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445 else: |
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446 |
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447 if d1[0][0] is None and d2[0][0] is None: |
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448 # case 🄼 — both deleted the file. |
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449 md.mark_added(filename) |
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450 copy_candidates.append(filename) |
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451 elif d1[1][0] is None and d2[1][0] is None: |
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452 # case 🄻 — both deleted the file. |
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453 md.mark_removed(filename) |
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454 elif d1[1][0] is not None and d2[1][0] is not None: |
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455 # case 🄽 🄾 🄿 |
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456 md.mark_merged(filename) |
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457 copy_candidates.append(filename) |
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458 else: |
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459 # Impossible case, the post-merge file status cannot be None on |
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460 # one side and Something on the other side. |
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461 assert False, "unreachable" |
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462 |
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463 # Iteration over remaining d2 content deal with the first column of the |
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464 # table. |
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465 for filename, d2 in diff_p2.items(): |
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466 _process_other_unchanged(md, mas, filename, d2) |
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467 |
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468 for filename in copy_candidates: |
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469 copy_info = ctx[filename].renamed() |
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470 if copy_info: |
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471 source, srcnode = copy_info |
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472 if source in p1_ctx and p1_ctx[source].filenode() == srcnode: |
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473 md.mark_copied_from_p1(source, filename) |
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474 elif source in p2_ctx and p2_ctx[source].filenode() == srcnode: |
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475 md.mark_copied_from_p2(source, filename) |
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476 return md |
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477 |
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478 |
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479 def _find(manifest, filename): |
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480 """return the associate filenode or None""" |
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481 if filename not in manifest: |
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482 return None |
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483 return manifest.find(filename)[0] |
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484 |
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485 |
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486 def _process_other_unchanged(md, mas, filename, diff): |
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487 source_node = diff[0][0] |
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488 target_node = diff[1][0] |
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489 |
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490 if source_node is not None and target_node is None: |
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491 if any(not _find(ma, filename) == source_node for ma in mas): |
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492 # case 🄲 of 🄷 |
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493 md.mark_removed(filename) |
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494 # else, we have case 🄱 or 🄶 : no change need to be recorded |
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495 elif source_node is None and target_node is not None: |
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496 if any(_find(ma, filename) is not None for ma in mas): |
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497 # case 🄴 or 🄹 |
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498 md.mark_salvaged(filename) |
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499 # else, we have case 🄳 or 🄸 : simple merge without intervention |
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500 elif source_node is not None and target_node is not None: |
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501 # case 🄵 or 🄺 : simple merge without intervention |
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502 # |
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503 # In buggy case where source_node is not an ancestors of target_node. |
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504 # There should have a been a new filenode created, recording this as |
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505 # "modified". We do not deal with them yet. |
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506 pass |
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507 else: |
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508 # An impossible case, the diff algorithm should not return entry if the |
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509 # file is missing on both side. |
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510 assert False, "unreachable" |
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511 |
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512 |
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513 def _missing_from_all_ancestors(mas, filename): |
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514 return all(_find(ma, filename) is None for ma in mas) |
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515 |
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516 |
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517 def computechangesetfilesadded(ctx): |
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518 """return the list of files added in a changeset |
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519 """ |
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520 added = [] |
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521 for f in ctx.files(): |
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522 if not any(f in p for p in ctx.parents()): |
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523 added.append(f) |
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524 return added |
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525 |
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526 |
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527 def get_removal_filter(ctx, x=None): |
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528 """return a function to detect files "wrongly" detected as `removed` |
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529 |
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530 When a file is removed relative to p1 in a merge, this |
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531 function determines whether the absence is due to a |
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532 deletion from a parent, or whether the merge commit |
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533 itself deletes the file. We decide this by doing a |
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534 simplified three way merge of the manifest entry for |
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535 the file. There are two ways we decide the merge |
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536 itself didn't delete a file: |
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537 - neither parent (nor the merge) contain the file |
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538 - exactly one parent contains the file, and that |
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539 parent has the same filelog entry as the merge |
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540 ancestor (or all of them if there two). In other |
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541 words, that parent left the file unchanged while the |
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542 other one deleted it. |
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543 One way to think about this is that deleting a file is |
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544 similar to emptying it, so the list of changed files |
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545 should be similar either way. The computation |
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546 described above is not done directly in _filecommit |
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547 when creating the list of changed files, however |
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548 it does something very similar by comparing filelog |
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549 nodes. |
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550 """ |
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551 |
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552 if x is not None: |
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553 p1, p2, m1, m2 = x |
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554 else: |
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555 p1 = ctx.p1() |
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556 p2 = ctx.p2() |
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557 m1 = p1.manifest() |
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558 m2 = p2.manifest() |
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559 |
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560 @util.cachefunc |
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561 def mas(): |
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562 p1n = p1.node() |
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563 p2n = p2.node() |
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564 cahs = ctx.repo().changelog.commonancestorsheads(p1n, p2n) |
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565 if not cahs: |
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566 cahs = [node.nullrev] |
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567 return [ctx.repo()[r].manifest() for r in cahs] |
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568 |
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569 def deletionfromparent(f): |
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570 if f in m1: |
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571 return f not in m2 and all( |
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572 f in ma and ma.find(f) == m1.find(f) for ma in mas() |
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573 ) |
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574 elif f in m2: |
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575 return all(f in ma and ma.find(f) == m2.find(f) for ma in mas()) |
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576 else: |
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577 return True |
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578 |
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579 return deletionfromparent |
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580 |
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581 |
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582 def computechangesetfilesremoved(ctx): |
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583 """return the list of files removed in a changeset |
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584 """ |
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585 removed = [] |
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586 for f in ctx.files(): |
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587 if f not in ctx: |
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588 removed.append(f) |
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589 if removed: |
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590 rf = get_removal_filter(ctx) |
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591 removed = [r for r in removed if not rf(r)] |
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592 return removed |
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593 |
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594 |
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595 def computechangesetfilesmerged(ctx): |
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596 """return the list of files merged in a changeset |
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597 """ |
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598 merged = [] |
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599 if len(ctx.parents()) < 2: |
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600 return merged |
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601 for f in ctx.files(): |
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602 if f in ctx: |
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603 fctx = ctx[f] |
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604 parents = fctx._filelog.parents(fctx._filenode) |
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605 if parents[1] != node.nullid: |
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606 merged.append(f) |
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607 return merged |
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608 |
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609 |
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610 def computechangesetcopies(ctx): |
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611 """return the copies data for a changeset |
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612 |
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613 The copies data are returned as a pair of dictionnary (p1copies, p2copies). |
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614 |
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615 Each dictionnary are in the form: `{newname: oldname}` |
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616 """ |
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617 p1copies = {} |
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618 p2copies = {} |
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619 p1 = ctx.p1() |
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620 p2 = ctx.p2() |
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621 narrowmatch = ctx._repo.narrowmatch() |
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622 for dst in ctx.files(): |
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623 if not narrowmatch(dst) or dst not in ctx: |
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624 continue |
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625 copied = ctx[dst].renamed() |
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626 if not copied: |
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627 continue |
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628 src, srcnode = copied |
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629 if src in p1 and p1[src].filenode() == srcnode: |
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630 p1copies[dst] = src |
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631 elif src in p2 and p2[src].filenode() == srcnode: |
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632 p2copies[dst] = src |
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633 return p1copies, p2copies |
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634 |
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635 |
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636 def encodecopies(files, copies): |
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637 items = [] |
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638 for i, dst in enumerate(files): |
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639 if dst in copies: |
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640 items.append(b'%d\0%s' % (i, copies[dst])) |
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641 if len(items) != len(copies): |
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642 raise error.ProgrammingError( |
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643 b'some copy targets missing from file list' |
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644 ) |
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645 return b"\n".join(items) |
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646 |
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647 |
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648 def decodecopies(files, data): |
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649 try: |
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650 copies = {} |
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651 if not data: |
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652 return copies |
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653 for l in data.split(b'\n'): |
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654 strindex, src = l.split(b'\0') |
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655 i = int(strindex) |
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656 dst = files[i] |
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657 copies[dst] = src |
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658 return copies |
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659 except (ValueError, IndexError): |
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660 # Perhaps someone had chosen the same key name (e.g. "p1copies") and |
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661 # used different syntax for the value. |
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662 return None |
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663 |
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664 |
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665 def encodefileindices(files, subset): |
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666 subset = set(subset) |
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667 indices = [] |
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668 for i, f in enumerate(files): |
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669 if f in subset: |
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670 indices.append(b'%d' % i) |
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671 return b'\n'.join(indices) |
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672 |
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673 |
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674 def decodefileindices(files, data): |
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675 try: |
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676 subset = [] |
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677 if not data: |
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678 return subset |
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679 for strindex in data.split(b'\n'): |
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680 i = int(strindex) |
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681 if i < 0 or i >= len(files): |
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682 return None |
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683 subset.append(files[i]) |
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684 return subset |
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685 except (ValueError, IndexError): |
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686 # Perhaps someone had chosen the same key name (e.g. "added") and |
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687 # used different syntax for the value. |
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688 return None |
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689 |
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690 |
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691 # see mercurial/helptext/internals/revlogs.txt for details about the format |
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692 |
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693 ACTION_MASK = int("111" "00", 2) |
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694 # note: untouched file used as copy source will as `000` for this mask. |
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695 ADDED_FLAG = int("001" "00", 2) |
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696 MERGED_FLAG = int("010" "00", 2) |
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697 REMOVED_FLAG = int("011" "00", 2) |
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698 SALVAGED_FLAG = int("100" "00", 2) |
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699 TOUCHED_FLAG = int("101" "00", 2) |
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700 |
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701 COPIED_MASK = int("11", 2) |
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702 COPIED_FROM_P1_FLAG = int("10", 2) |
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703 COPIED_FROM_P2_FLAG = int("11", 2) |
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704 |
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705 # structure is <flag><filename-end><copy-source> |
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706 INDEX_HEADER = struct.Struct(">L") |
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707 INDEX_ENTRY = struct.Struct(">bLL") |
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708 |
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709 |
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710 def encode_files_sidedata(files): |
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711 all_files = set(files.touched) |
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712 all_files.update(files.copied_from_p1.values()) |
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713 all_files.update(files.copied_from_p2.values()) |
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714 all_files = sorted(all_files) |
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715 file_idx = {f: i for (i, f) in enumerate(all_files)} |
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716 file_idx[None] = 0 |
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717 |
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718 chunks = [INDEX_HEADER.pack(len(all_files))] |
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719 |
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720 filename_length = 0 |
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721 for f in all_files: |
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722 filename_size = len(f) |
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723 filename_length += filename_size |
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724 flag = 0 |
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725 if f in files.added: |
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726 flag |= ADDED_FLAG |
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727 elif f in files.merged: |
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728 flag |= MERGED_FLAG |
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729 elif f in files.removed: |
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730 flag |= REMOVED_FLAG |
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|
731 elif f in files.salvaged: |
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|
732 flag |= SALVAGED_FLAG |
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|
733 elif f in files.touched: |
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|
734 flag |= TOUCHED_FLAG |
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|
735 |
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|
736 copy = None |
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737 if f in files.copied_from_p1: |
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|
738 flag |= COPIED_FROM_P1_FLAG |
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|
739 copy = files.copied_from_p1.get(f) |
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|
740 elif f in files.copied_from_p2: |
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741 copy = files.copied_from_p2.get(f) |
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|
742 flag |= COPIED_FROM_P2_FLAG |
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743 copy_idx = file_idx[copy] |
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|
744 chunks.append(INDEX_ENTRY.pack(flag, filename_length, copy_idx)) |
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745 chunks.extend(all_files) |
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|
746 return {sidedatamod.SD_FILES: b''.join(chunks)} |
45325
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|
747 |
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|
748 |
45635
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|
749 def decode_files_sidedata(sidedata): |
45634
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750 md = ChangingFiles() |
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751 raw = sidedata.get(sidedatamod.SD_FILES) |
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752 |
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|
753 if raw is None: |
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754 return md |
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755 |
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|
756 copies = [] |
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|
757 all_files = [] |
45571
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|
758 |
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759 assert len(raw) >= INDEX_HEADER.size |
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760 total_files = INDEX_HEADER.unpack_from(raw, 0)[0] |
45571
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|
761 |
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|
762 offset = INDEX_HEADER.size |
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|
763 file_offset_base = offset + (INDEX_ENTRY.size * total_files) |
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|
764 file_offset_last = file_offset_base |
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|
765 |
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|
766 assert len(raw) >= file_offset_base |
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|
767 |
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|
768 for idx in range(total_files): |
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769 flag, file_end, copy_idx = INDEX_ENTRY.unpack_from(raw, offset) |
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770 file_end += file_offset_base |
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771 filename = raw[file_offset_last:file_end] |
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772 filesize = file_end - file_offset_last |
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773 assert len(filename) == filesize |
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774 offset += INDEX_ENTRY.size |
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775 file_offset_last = file_end |
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|
776 all_files.append(filename) |
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|
777 if flag & ACTION_MASK == ADDED_FLAG: |
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|
778 md.mark_added(filename) |
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|
779 elif flag & ACTION_MASK == MERGED_FLAG: |
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|
780 md.mark_merged(filename) |
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|
781 elif flag & ACTION_MASK == REMOVED_FLAG: |
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|
782 md.mark_removed(filename) |
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783 elif flag & ACTION_MASK == SALVAGED_FLAG: |
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|
784 md.mark_salvaged(filename) |
45634
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|
785 elif flag & ACTION_MASK == TOUCHED_FLAG: |
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|
786 md.mark_touched(filename) |
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|
787 |
45634
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|
788 copied = None |
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789 if flag & COPIED_MASK == COPIED_FROM_P1_FLAG: |
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|
790 copied = md.mark_copied_from_p1 |
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|
791 elif flag & COPIED_MASK == COPIED_FROM_P2_FLAG: |
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|
792 copied = md.mark_copied_from_p2 |
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|
793 |
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|
794 if copied is not None: |
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|
795 copies.append((copied, filename, copy_idx)) |
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|
796 |
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|
797 for copied, filename, copy_idx in copies: |
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|
798 copied(all_files[copy_idx], filename) |
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|
799 |
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|
800 return md |
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801 |
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|
802 |
44940
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803 def _getsidedata(srcrepo, rev): |
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|
804 ctx = srcrepo[rev] |
45663
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45660
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|
805 files = compute_all_files_changes(ctx) |
45734
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diff
changeset
|
806 return encode_files_sidedata(files), files.has_copies_info |
44940
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807 |
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808 |
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809 def getsidedataadder(srcrepo, destrepo): |
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810 use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade') |
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|
811 if pycompat.iswindows or not use_w: |
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|
812 return _get_simple_sidedata_adder(srcrepo, destrepo) |
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|
813 else: |
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|
814 return _get_worker_sidedata_adder(srcrepo, destrepo) |
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815 |
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|
816 |
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|
817 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens): |
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818 """The function used by worker precomputing sidedata |
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|
819 |
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|
820 It read an input queue containing revision numbers |
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|
821 It write in an output queue containing (rev, <sidedata-map>) |
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822 |
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|
823 The `None` input value is used as a stop signal. |
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|
824 |
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|
825 The `tokens` semaphore is user to avoid having too many unprocessed |
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|
826 entries. The workers needs to acquire one token before fetching a task. |
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827 They will be released by the consumer of the produced data. |
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|
828 """ |
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|
829 tokens.acquire() |
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|
830 rev = revs_queue.get() |
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831 while rev is not None: |
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832 data = _getsidedata(srcrepo, rev) |
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833 sidedata_queue.put((rev, data)) |
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834 tokens.acquire() |
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835 rev = revs_queue.get() |
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836 # processing of `None` is completed, release the token. |
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837 tokens.release() |
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838 |
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839 |
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840 BUFF_PER_WORKER = 50 |
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841 |
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842 |
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843 def _get_worker_sidedata_adder(srcrepo, destrepo): |
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844 """The parallel version of the sidedata computation |
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845 |
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846 This code spawn a pool of worker that precompute a buffer of sidedata |
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847 before we actually need them""" |
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848 # avoid circular import copies -> scmutil -> worker -> copies |
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849 from . import worker |
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850 |
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851 nbworkers = worker._numworkers(srcrepo.ui) |
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852 |
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853 tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER) |
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854 revsq = multiprocessing.Queue() |
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855 sidedataq = multiprocessing.Queue() |
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856 |
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857 assert srcrepo.filtername is None |
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858 # queue all tasks beforehand, revision numbers are small and it make |
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859 # synchronisation simpler |
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860 # |
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861 # Since the computation for each node can be quite expensive, the overhead |
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862 # of using a single queue is not revelant. In practice, most computation |
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863 # are fast but some are very expensive and dominate all the other smaller |
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864 # cost. |
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865 for r in srcrepo.changelog.revs(): |
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866 revsq.put(r) |
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867 # queue the "no more tasks" markers |
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868 for i in range(nbworkers): |
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869 revsq.put(None) |
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870 |
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871 allworkers = [] |
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872 for i in range(nbworkers): |
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873 args = (srcrepo, revsq, sidedataq, tokens) |
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874 w = multiprocessing.Process(target=_sidedata_worker, args=args) |
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875 allworkers.append(w) |
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876 w.start() |
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877 |
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878 # dictionnary to store results for revision higher than we one we are |
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879 # looking for. For example, if we need the sidedatamap for 42, and 43 is |
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880 # received, when shelve 43 for later use. |
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881 staging = {} |
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882 |
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883 def sidedata_companion(revlog, rev): |
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884 data = {}, False |
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885 if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog |
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886 # Is the data previously shelved ? |
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887 sidedata = staging.pop(rev, None) |
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888 if sidedata is None: |
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889 # look at the queued result until we find the one we are lookig |
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890 # for (shelve the other ones) |
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891 r, data = sidedataq.get() |
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892 while r != rev: |
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893 staging[r] = data |
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894 r, sidedata = sidedataq.get() |
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895 tokens.release() |
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896 sidedataq, has_copies_info = data |
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897 return False, (), sidedata |
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898 |
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899 return sidedata_companion |
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900 |
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901 |
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902 def _get_simple_sidedata_adder(srcrepo, destrepo): |
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903 """The simple version of the sidedata computation |
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904 |
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905 It just compute it in the same thread on request""" |
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906 |
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907 def sidedatacompanion(revlog, rev): |
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908 sidedata = {} |
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909 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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910 sidedata, has_copies_info = _getsidedata(srcrepo, rev) |
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911 return False, (), sidedata |
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912 |
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913 return sidedatacompanion |
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914 |
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915 |
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916 def getsidedataremover(srcrepo, destrepo): |
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917 def sidedatacompanion(revlog, rev): |
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918 f = () |
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919 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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920 if revlog.flags(rev) & sidedataflag.REVIDX_SIDEDATA: |
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921 f = ( |
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922 sidedatamod.SD_P1COPIES, |
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923 sidedatamod.SD_P2COPIES, |
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924 sidedatamod.SD_FILESADDED, |
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925 sidedatamod.SD_FILESREMOVED, |
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926 ) |
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927 return False, f, {} |
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928 |
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929 return sidedatacompanion |