Mercurial > hg
annotate mercurial/metadata.py @ 45659:a475db79d84d
changing-files: add a "salvaged" set to track file that were not removed
We need this set for the copy tracing algorithm. See documentation for details
about this set.
Differential Revision: https://phab.mercurial-scm.org/D9118
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 14 Sep 2020 23:46:21 +0200 |
parents | 9003e6524f78 |
children | e66db30f95a8 |
rev | line source |
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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 import struct |
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12 |
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13 from . import ( |
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14 error, |
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15 node, |
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16 pycompat, |
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17 util, |
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18 ) |
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19 |
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20 from .revlogutils import ( |
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21 flagutil as sidedataflag, |
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22 sidedata as sidedatamod, |
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23 ) |
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24 |
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25 |
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26 class ChangingFiles(object): |
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27 """A class recording the changes made to files by a changeset |
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28 |
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29 Actions performed on files are gathered into 3 sets: |
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30 |
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31 - added: files actively added in the changeset. |
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32 - merged: files whose history got merged |
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33 - removed: files removed in the revision |
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34 - salvaged: files that might have been deleted by a merge but were not |
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35 - touched: files affected by the merge |
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36 |
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37 and copies information is held by 2 mappings |
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38 |
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39 - copied_from_p1: {"<new-name>": "<source-name-in-p1>"} mapping for copies |
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40 - copied_from_p2: {"<new-name>": "<source-name-in-p2>"} mapping for copies |
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41 |
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42 See their inline help for details. |
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43 """ |
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44 |
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45 def __init__( |
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46 self, |
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47 touched=None, |
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48 added=None, |
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49 removed=None, |
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50 merged=None, |
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51 salvaged=None, |
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52 p1_copies=None, |
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53 p2_copies=None, |
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54 ): |
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55 self._added = set(() if added is None else added) |
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56 self._merged = set(() if merged is None else merged) |
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57 self._removed = set(() if removed is None else removed) |
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58 self._touched = set(() if touched is None else touched) |
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59 self._salvaged = set(() if salvaged is None else salvaged) |
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60 self._touched.update(self._added) |
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61 self._touched.update(self._merged) |
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62 self._touched.update(self._removed) |
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63 self._p1_copies = dict(() if p1_copies is None else p1_copies) |
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64 self._p2_copies = dict(() if p2_copies is None else p2_copies) |
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65 |
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66 def __eq__(self, other): |
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67 return ( |
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68 self.added == other.added |
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69 and self.merged == other.merged |
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70 and self.removed == other.removed |
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71 and self.salvaged == other.salvaged |
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72 and self.touched == other.touched |
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73 and self.copied_from_p1 == other.copied_from_p1 |
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74 and self.copied_from_p2 == other.copied_from_p2 |
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75 ) |
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76 |
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77 @util.propertycache |
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78 def added(self): |
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79 """files actively added in the changeset |
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80 |
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81 Any file present in that revision that was absent in all the changeset's |
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82 parents. |
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83 |
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84 In case of merge, this means a file absent in one of the parents but |
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85 existing in the other will *not* be contained in this set. (They were |
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86 added by an ancestor) |
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87 """ |
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88 return frozenset(self._added) |
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89 |
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90 def mark_added(self, filename): |
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91 if 'added' in vars(self): |
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92 del self.added |
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93 self._added.add(filename) |
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94 self.mark_touched(filename) |
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95 |
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96 def update_added(self, filenames): |
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97 for f in filenames: |
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98 self.mark_added(f) |
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99 |
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100 @util.propertycache |
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101 def merged(self): |
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102 """files actively merged during a merge |
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103 |
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104 Any modified files which had modification on both size that needed merging. |
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105 |
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106 In this case a new filenode was created and it has two parents. |
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107 """ |
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108 return frozenset(self._merged) |
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109 |
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110 def mark_merged(self, filename): |
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111 if 'merged' in vars(self): |
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112 del self.merged |
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113 self._merged.add(filename) |
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114 self.mark_touched(filename) |
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115 |
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116 def update_merged(self, filenames): |
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117 for f in filenames: |
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118 self.mark_merged(f) |
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119 |
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120 @util.propertycache |
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121 def removed(self): |
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122 """files actively removed by the changeset |
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123 |
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124 In case of merge this will only contain the set of files removing "new" |
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125 content. For any file absent in the current changeset: |
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126 |
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127 a) If the file exists in both parents, it is clearly "actively" removed |
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128 by this changeset. |
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129 |
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130 b) If a file exists in only one parent and in none of the common |
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131 ancestors, then the file was newly added in one of the merged branches |
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132 and then got "actively" removed. |
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133 |
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134 c) If a file exists in only one parent and at least one of the common |
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135 ancestors using the same filenode, then the file was unchanged on one |
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136 side and deleted on the other side. The merge "passively" propagated |
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137 that deletion, but didn't "actively" remove the file. In this case the |
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138 file is *not* included in the `removed` set. |
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139 |
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140 d) If a file exists in only one parent and at least one of the common |
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141 ancestors using a different filenode, then the file was changed on one |
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142 side and removed on the other side. The merge process "actively" |
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143 decided to drop the new change and delete the file. Unlike in the |
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144 previous case, (c), the file included in the `removed` set. |
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145 |
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146 Summary table for merge: |
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147 |
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148 case | exists in parents | exists in gca || removed |
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149 (a) | both | * || yes |
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150 (b) | one | none || yes |
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151 (c) | one | same filenode || no |
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152 (d) | one | new filenode || yes |
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153 """ |
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154 return frozenset(self._removed) |
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155 |
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156 def mark_removed(self, filename): |
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157 if 'removed' in vars(self): |
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158 del self.removed |
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159 self._removed.add(filename) |
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160 self.mark_touched(filename) |
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161 |
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162 def update_removed(self, filenames): |
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163 for f in filenames: |
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164 self.mark_removed(f) |
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165 |
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166 @util.propertycache |
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167 def salvaged(self): |
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168 """files that might have been deleted by a merge, but still exists. |
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169 |
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170 During a merge, the manifest merging might select some files for |
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171 removal, or for a removed/changed conflict. If at commit time the file |
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172 still exists, its removal was "reverted" and the file is "salvaged" |
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173 """ |
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174 return frozenset(self._salvaged) |
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175 |
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176 def mark_salvaged(self, filename): |
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177 if "salvaged" in vars(self): |
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178 del self.salvaged |
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179 self._salvaged.add(filename) |
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180 self.mark_touched(filename) |
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181 |
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182 def update_salvaged(self, filenames): |
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183 for f in filenames: |
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184 self.mark_salvaged(f) |
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185 |
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186 @util.propertycache |
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187 def touched(self): |
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188 """files either actively modified, added or removed""" |
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189 return frozenset(self._touched) |
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190 |
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191 def mark_touched(self, filename): |
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192 if 'touched' in vars(self): |
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193 del self.touched |
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194 self._touched.add(filename) |
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195 |
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196 def update_touched(self, filenames): |
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197 for f in filenames: |
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198 self.mark_touched(f) |
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199 |
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200 @util.propertycache |
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201 def copied_from_p1(self): |
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202 return self._p1_copies.copy() |
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203 |
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204 def mark_copied_from_p1(self, source, dest): |
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205 if 'copied_from_p1' in vars(self): |
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206 del self.copied_from_p1 |
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207 self._p1_copies[dest] = source |
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208 |
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209 def update_copies_from_p1(self, copies): |
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210 for dest, source in copies.items(): |
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211 self.mark_copied_from_p1(source, dest) |
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212 |
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213 @util.propertycache |
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214 def copied_from_p2(self): |
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215 return self._p2_copies.copy() |
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216 |
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217 def mark_copied_from_p2(self, source, dest): |
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218 if 'copied_from_p2' in vars(self): |
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219 del self.copied_from_p2 |
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220 self._p2_copies[dest] = source |
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221 |
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222 def update_copies_from_p2(self, copies): |
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223 for dest, source in copies.items(): |
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224 self.mark_copied_from_p2(source, dest) |
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225 |
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226 |
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227 def computechangesetfilesadded(ctx): |
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228 """return the list of files added in a changeset |
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229 """ |
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230 added = [] |
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231 for f in ctx.files(): |
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232 if not any(f in p for p in ctx.parents()): |
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233 added.append(f) |
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234 return added |
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235 |
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236 |
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237 def get_removal_filter(ctx, x=None): |
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238 """return a function to detect files "wrongly" detected as `removed` |
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239 |
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240 When a file is removed relative to p1 in a merge, this |
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241 function determines whether the absence is due to a |
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242 deletion from a parent, or whether the merge commit |
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243 itself deletes the file. We decide this by doing a |
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244 simplified three way merge of the manifest entry for |
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245 the file. There are two ways we decide the merge |
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246 itself didn't delete a file: |
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247 - neither parent (nor the merge) contain the file |
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248 - exactly one parent contains the file, and that |
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249 parent has the same filelog entry as the merge |
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250 ancestor (or all of them if there two). In other |
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251 words, that parent left the file unchanged while the |
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252 other one deleted it. |
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253 One way to think about this is that deleting a file is |
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254 similar to emptying it, so the list of changed files |
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255 should be similar either way. The computation |
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256 described above is not done directly in _filecommit |
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257 when creating the list of changed files, however |
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258 it does something very similar by comparing filelog |
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259 nodes. |
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260 """ |
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261 |
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262 if x is not None: |
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263 p1, p2, m1, m2 = x |
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264 else: |
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265 p1 = ctx.p1() |
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266 p2 = ctx.p2() |
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267 m1 = p1.manifest() |
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268 m2 = p2.manifest() |
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269 |
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270 @util.cachefunc |
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271 def mas(): |
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272 p1n = p1.node() |
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273 p2n = p2.node() |
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274 cahs = ctx.repo().changelog.commonancestorsheads(p1n, p2n) |
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275 if not cahs: |
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276 cahs = [node.nullrev] |
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277 return [ctx.repo()[r].manifest() for r in cahs] |
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278 |
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279 def deletionfromparent(f): |
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280 if f in m1: |
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281 return f not in m2 and all( |
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282 f in ma and ma.find(f) == m1.find(f) for ma in mas() |
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283 ) |
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284 elif f in m2: |
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285 return all(f in ma and ma.find(f) == m2.find(f) for ma in mas()) |
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286 else: |
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287 return True |
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288 |
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289 return deletionfromparent |
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290 |
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291 |
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292 def computechangesetfilesremoved(ctx): |
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293 """return the list of files removed in a changeset |
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294 """ |
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295 removed = [] |
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296 for f in ctx.files(): |
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297 if f not in ctx: |
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298 removed.append(f) |
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299 if removed: |
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300 rf = get_removal_filter(ctx) |
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301 removed = [r for r in removed if not rf(r)] |
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302 return removed |
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303 |
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304 |
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305 def computechangesetfilesmerged(ctx): |
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306 """return the list of files merged in a changeset |
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307 """ |
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308 merged = [] |
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309 if len(ctx.parents()) < 2: |
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310 return merged |
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311 for f in ctx.files(): |
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312 if f in ctx: |
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313 fctx = ctx[f] |
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314 parents = fctx._filelog.parents(fctx._filenode) |
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315 if parents[1] != node.nullid: |
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316 merged.append(f) |
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317 return merged |
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318 |
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319 |
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320 def computechangesetcopies(ctx): |
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321 """return the copies data for a changeset |
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322 |
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323 The copies data are returned as a pair of dictionnary (p1copies, p2copies). |
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324 |
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325 Each dictionnary are in the form: `{newname: oldname}` |
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326 """ |
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327 p1copies = {} |
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328 p2copies = {} |
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329 p1 = ctx.p1() |
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330 p2 = ctx.p2() |
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331 narrowmatch = ctx._repo.narrowmatch() |
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332 for dst in ctx.files(): |
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333 if not narrowmatch(dst) or dst not in ctx: |
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334 continue |
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335 copied = ctx[dst].renamed() |
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336 if not copied: |
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337 continue |
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338 src, srcnode = copied |
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339 if src in p1 and p1[src].filenode() == srcnode: |
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340 p1copies[dst] = src |
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341 elif src in p2 and p2[src].filenode() == srcnode: |
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342 p2copies[dst] = src |
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343 return p1copies, p2copies |
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344 |
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345 |
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346 def encodecopies(files, copies): |
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347 items = [] |
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348 for i, dst in enumerate(files): |
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349 if dst in copies: |
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350 items.append(b'%d\0%s' % (i, copies[dst])) |
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351 if len(items) != len(copies): |
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352 raise error.ProgrammingError( |
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353 b'some copy targets missing from file list' |
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354 ) |
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355 return b"\n".join(items) |
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356 |
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357 |
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358 def decodecopies(files, data): |
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359 try: |
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360 copies = {} |
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361 if not data: |
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362 return copies |
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363 for l in data.split(b'\n'): |
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364 strindex, src = l.split(b'\0') |
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365 i = int(strindex) |
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366 dst = files[i] |
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367 copies[dst] = src |
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368 return copies |
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369 except (ValueError, IndexError): |
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370 # Perhaps someone had chosen the same key name (e.g. "p1copies") and |
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371 # used different syntax for the value. |
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372 return None |
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373 |
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374 |
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375 def encodefileindices(files, subset): |
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376 subset = set(subset) |
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377 indices = [] |
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378 for i, f in enumerate(files): |
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379 if f in subset: |
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380 indices.append(b'%d' % i) |
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381 return b'\n'.join(indices) |
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382 |
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383 |
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384 def decodefileindices(files, data): |
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385 try: |
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386 subset = [] |
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387 if not data: |
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388 return subset |
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389 for strindex in data.split(b'\n'): |
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390 i = int(strindex) |
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391 if i < 0 or i >= len(files): |
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392 return None |
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393 subset.append(files[i]) |
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394 return subset |
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395 except (ValueError, IndexError): |
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396 # Perhaps someone had chosen the same key name (e.g. "added") and |
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397 # used different syntax for the value. |
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398 return None |
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399 |
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400 |
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401 # see mercurial/helptext/internals/revlogs.txt for details about the format |
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402 |
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403 ACTION_MASK = int("111" "00", 2) |
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404 # note: untouched file used as copy source will as `000` for this mask. |
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405 ADDED_FLAG = int("001" "00", 2) |
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406 MERGED_FLAG = int("010" "00", 2) |
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407 REMOVED_FLAG = int("011" "00", 2) |
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408 # `100` is reserved for future use |
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409 TOUCHED_FLAG = int("101" "00", 2) |
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410 |
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411 COPIED_MASK = int("11", 2) |
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412 COPIED_FROM_P1_FLAG = int("10", 2) |
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413 COPIED_FROM_P2_FLAG = int("11", 2) |
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414 |
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415 # structure is <flag><filename-end><copy-source> |
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416 INDEX_HEADER = struct.Struct(">L") |
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417 INDEX_ENTRY = struct.Struct(">bLL") |
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418 |
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419 |
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420 def encode_files_sidedata(files): |
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421 all_files = set(files.touched) |
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422 all_files.update(files.copied_from_p1.values()) |
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423 all_files.update(files.copied_from_p2.values()) |
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424 all_files = sorted(all_files) |
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425 file_idx = {f: i for (i, f) in enumerate(all_files)} |
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426 file_idx[None] = 0 |
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427 |
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428 chunks = [INDEX_HEADER.pack(len(all_files))] |
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429 |
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430 filename_length = 0 |
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431 for f in all_files: |
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432 filename_size = len(f) |
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433 filename_length += filename_size |
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434 flag = 0 |
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435 if f in files.added: |
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436 flag |= ADDED_FLAG |
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437 elif f in files.merged: |
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438 flag |= MERGED_FLAG |
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439 elif f in files.removed: |
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440 flag |= REMOVED_FLAG |
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441 elif f in files.touched: |
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442 flag |= TOUCHED_FLAG |
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443 |
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444 copy = None |
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445 if f in files.copied_from_p1: |
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446 flag |= COPIED_FROM_P1_FLAG |
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447 copy = files.copied_from_p1.get(f) |
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448 elif f in files.copied_from_p2: |
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449 copy = files.copied_from_p2.get(f) |
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450 flag |= COPIED_FROM_P2_FLAG |
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451 copy_idx = file_idx[copy] |
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452 chunks.append(INDEX_ENTRY.pack(flag, filename_length, copy_idx)) |
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453 chunks.extend(all_files) |
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454 return {sidedatamod.SD_FILES: b''.join(chunks)} |
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455 |
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456 |
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457 def decode_files_sidedata(sidedata): |
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458 md = ChangingFiles() |
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459 raw = sidedata.get(sidedatamod.SD_FILES) |
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460 |
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461 if raw is None: |
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462 return md |
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463 |
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464 copies = [] |
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465 all_files = [] |
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466 |
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467 assert len(raw) >= INDEX_HEADER.size |
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468 total_files = INDEX_HEADER.unpack_from(raw, 0)[0] |
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469 |
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470 offset = INDEX_HEADER.size |
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471 file_offset_base = offset + (INDEX_ENTRY.size * total_files) |
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472 file_offset_last = file_offset_base |
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473 |
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474 assert len(raw) >= file_offset_base |
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475 |
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476 for idx in range(total_files): |
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477 flag, file_end, copy_idx = INDEX_ENTRY.unpack_from(raw, offset) |
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478 file_end += file_offset_base |
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479 filename = raw[file_offset_last:file_end] |
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480 filesize = file_end - file_offset_last |
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481 assert len(filename) == filesize |
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482 offset += INDEX_ENTRY.size |
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483 file_offset_last = file_end |
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484 all_files.append(filename) |
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485 if flag & ACTION_MASK == ADDED_FLAG: |
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486 md.mark_added(filename) |
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487 elif flag & ACTION_MASK == MERGED_FLAG: |
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488 md.mark_merged(filename) |
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489 elif flag & ACTION_MASK == REMOVED_FLAG: |
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490 md.mark_removed(filename) |
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491 elif flag & ACTION_MASK == TOUCHED_FLAG: |
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492 md.mark_touched(filename) |
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493 |
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494 copied = None |
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495 if flag & COPIED_MASK == COPIED_FROM_P1_FLAG: |
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496 copied = md.mark_copied_from_p1 |
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497 elif flag & COPIED_MASK == COPIED_FROM_P2_FLAG: |
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498 copied = md.mark_copied_from_p2 |
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499 |
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500 if copied is not None: |
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501 copies.append((copied, filename, copy_idx)) |
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502 |
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503 for copied, filename, copy_idx in copies: |
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504 copied(all_files[copy_idx], filename) |
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505 |
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506 return md |
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507 |
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508 |
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509 def _getsidedata(srcrepo, rev): |
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510 ctx = srcrepo[rev] |
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511 filescopies = computechangesetcopies(ctx) |
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512 filesadded = computechangesetfilesadded(ctx) |
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513 filesremoved = computechangesetfilesremoved(ctx) |
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514 filesmerged = computechangesetfilesmerged(ctx) |
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515 files = ChangingFiles() |
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516 files.update_touched(ctx.files()) |
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517 files.update_added(filesadded) |
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518 files.update_removed(filesremoved) |
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519 files.update_merged(filesmerged) |
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520 files.update_copies_from_p1(filescopies[0]) |
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521 files.update_copies_from_p2(filescopies[1]) |
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522 return encode_files_sidedata(files) |
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523 |
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524 |
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525 def getsidedataadder(srcrepo, destrepo): |
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526 use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade') |
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527 if pycompat.iswindows or not use_w: |
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528 return _get_simple_sidedata_adder(srcrepo, destrepo) |
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529 else: |
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530 return _get_worker_sidedata_adder(srcrepo, destrepo) |
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531 |
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532 |
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533 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens): |
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534 """The function used by worker precomputing sidedata |
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535 |
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536 It read an input queue containing revision numbers |
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537 It write in an output queue containing (rev, <sidedata-map>) |
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538 |
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539 The `None` input value is used as a stop signal. |
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540 |
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541 The `tokens` semaphore is user to avoid having too many unprocessed |
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542 entries. The workers needs to acquire one token before fetching a task. |
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543 They will be released by the consumer of the produced data. |
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544 """ |
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545 tokens.acquire() |
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546 rev = revs_queue.get() |
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547 while rev is not None: |
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548 data = _getsidedata(srcrepo, rev) |
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549 sidedata_queue.put((rev, data)) |
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550 tokens.acquire() |
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551 rev = revs_queue.get() |
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552 # processing of `None` is completed, release the token. |
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553 tokens.release() |
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554 |
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555 |
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556 BUFF_PER_WORKER = 50 |
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557 |
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558 |
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559 def _get_worker_sidedata_adder(srcrepo, destrepo): |
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560 """The parallel version of the sidedata computation |
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561 |
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562 This code spawn a pool of worker that precompute a buffer of sidedata |
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563 before we actually need them""" |
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564 # avoid circular import copies -> scmutil -> worker -> copies |
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565 from . import worker |
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566 |
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567 nbworkers = worker._numworkers(srcrepo.ui) |
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568 |
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569 tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER) |
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570 revsq = multiprocessing.Queue() |
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571 sidedataq = multiprocessing.Queue() |
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572 |
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573 assert srcrepo.filtername is None |
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574 # queue all tasks beforehand, revision numbers are small and it make |
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575 # synchronisation simpler |
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576 # |
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577 # Since the computation for each node can be quite expensive, the overhead |
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578 # of using a single queue is not revelant. In practice, most computation |
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579 # are fast but some are very expensive and dominate all the other smaller |
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580 # cost. |
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581 for r in srcrepo.changelog.revs(): |
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582 revsq.put(r) |
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583 # queue the "no more tasks" markers |
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584 for i in range(nbworkers): |
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585 revsq.put(None) |
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586 |
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587 allworkers = [] |
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588 for i in range(nbworkers): |
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589 args = (srcrepo, revsq, sidedataq, tokens) |
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590 w = multiprocessing.Process(target=_sidedata_worker, args=args) |
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591 allworkers.append(w) |
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592 w.start() |
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593 |
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594 # dictionnary to store results for revision higher than we one we are |
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595 # looking for. For example, if we need the sidedatamap for 42, and 43 is |
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596 # received, when shelve 43 for later use. |
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597 staging = {} |
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598 |
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599 def sidedata_companion(revlog, rev): |
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600 sidedata = {} |
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601 if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog |
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602 # Is the data previously shelved ? |
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603 sidedata = staging.pop(rev, None) |
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604 if sidedata is None: |
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605 # look at the queued result until we find the one we are lookig |
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606 # for (shelve the other ones) |
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607 r, sidedata = sidedataq.get() |
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608 while r != rev: |
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609 staging[r] = sidedata |
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610 r, sidedata = sidedataq.get() |
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611 tokens.release() |
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612 return False, (), sidedata |
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613 |
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614 return sidedata_companion |
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615 |
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616 |
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617 def _get_simple_sidedata_adder(srcrepo, destrepo): |
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618 """The simple version of the sidedata computation |
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619 |
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620 It just compute it in the same thread on request""" |
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621 |
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622 def sidedatacompanion(revlog, rev): |
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623 sidedata = {} |
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624 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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625 sidedata = _getsidedata(srcrepo, rev) |
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626 return False, (), sidedata |
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627 |
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628 return sidedatacompanion |
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629 |
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630 |
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631 def getsidedataremover(srcrepo, destrepo): |
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632 def sidedatacompanion(revlog, rev): |
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633 f = () |
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634 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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635 if revlog.flags(rev) & sidedataflag.REVIDX_SIDEDATA: |
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636 f = ( |
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637 sidedatamod.SD_P1COPIES, |
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638 sidedatamod.SD_P2COPIES, |
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639 sidedatamod.SD_FILESADDED, |
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640 sidedatamod.SD_FILESREMOVED, |
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641 ) |
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642 return False, f, {} |
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643 |
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644 return sidedatacompanion |