Mercurial > hg
annotate mercurial/metadata.py @ 45668:47ad23549b81
changing-files: add clean computation of changed file for merges
This is "a tad more complicated" than the previous cases. See inline
documentation for details (have fun).
Differential Revision: https://phab.mercurial-scm.org/D9128
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 29 Sep 2020 22:47:54 +0200 |
parents | 0303fc1f43f8 |
children | e53778ad64bf |
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 @util.propertycache |
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79 def added(self): |
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80 """files actively added in the changeset |
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81 |
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82 Any file present in that revision that was absent in all the changeset's |
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83 parents. |
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84 |
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85 In case of merge, this means a file absent in one of the parents but |
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86 existing in the other will *not* be contained in this set. (They were |
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87 added by an ancestor) |
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88 """ |
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89 return frozenset(self._added) |
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90 |
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91 def mark_added(self, filename): |
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92 if 'added' in vars(self): |
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93 del self.added |
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94 self._added.add(filename) |
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95 self.mark_touched(filename) |
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96 |
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97 def update_added(self, filenames): |
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98 for f in filenames: |
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99 self.mark_added(f) |
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100 |
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101 @util.propertycache |
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102 def merged(self): |
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103 """files actively merged during a merge |
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104 |
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105 Any modified files which had modification on both size that needed merging. |
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106 |
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107 In this case a new filenode was created and it has two parents. |
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108 """ |
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109 return frozenset(self._merged) |
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110 |
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111 def mark_merged(self, filename): |
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112 if 'merged' in vars(self): |
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113 del self.merged |
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114 self._merged.add(filename) |
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115 self.mark_touched(filename) |
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116 |
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117 def update_merged(self, filenames): |
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118 for f in filenames: |
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119 self.mark_merged(f) |
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120 |
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121 @util.propertycache |
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122 def removed(self): |
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123 """files actively removed by the changeset |
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124 |
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125 In case of merge this will only contain the set of files removing "new" |
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126 content. For any file absent in the current changeset: |
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127 |
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128 a) If the file exists in both parents, it is clearly "actively" removed |
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129 by this changeset. |
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130 |
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131 b) If a file exists in only one parent and in none of the common |
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132 ancestors, then the file was newly added in one of the merged branches |
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133 and then got "actively" removed. |
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134 |
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135 c) If a file exists in only one parent and at least one of the common |
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136 ancestors using the same filenode, then the file was unchanged on one |
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137 side and deleted on the other side. The merge "passively" propagated |
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138 that deletion, but didn't "actively" remove the file. In this case the |
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139 file is *not* included in the `removed` set. |
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140 |
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141 d) If a file exists in only one parent and at least one of the common |
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142 ancestors using a different filenode, then the file was changed on one |
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143 side and removed on the other side. The merge process "actively" |
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144 decided to drop the new change and delete the file. Unlike in the |
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145 previous case, (c), the file included in the `removed` set. |
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146 |
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147 Summary table for merge: |
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148 |
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149 case | exists in parents | exists in gca || removed |
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150 (a) | both | * || yes |
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151 (b) | one | none || yes |
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152 (c) | one | same filenode || no |
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153 (d) | one | new filenode || yes |
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154 """ |
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155 return frozenset(self._removed) |
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156 |
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157 def mark_removed(self, filename): |
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158 if 'removed' in vars(self): |
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159 del self.removed |
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160 self._removed.add(filename) |
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161 self.mark_touched(filename) |
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162 |
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163 def update_removed(self, filenames): |
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164 for f in filenames: |
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165 self.mark_removed(f) |
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166 |
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167 @util.propertycache |
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168 def salvaged(self): |
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169 """files that might have been deleted by a merge, but still exists. |
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170 |
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171 During a merge, the manifest merging might select some files for |
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172 removal, or for a removed/changed conflict. If at commit time the file |
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173 still exists, its removal was "reverted" and the file is "salvaged" |
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174 """ |
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175 return frozenset(self._salvaged) |
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176 |
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177 def mark_salvaged(self, filename): |
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178 if "salvaged" in vars(self): |
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179 del self.salvaged |
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180 self._salvaged.add(filename) |
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181 self.mark_touched(filename) |
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182 |
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183 def update_salvaged(self, filenames): |
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184 for f in filenames: |
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185 self.mark_salvaged(f) |
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186 |
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187 @util.propertycache |
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188 def touched(self): |
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189 """files either actively modified, added or removed""" |
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190 return frozenset(self._touched) |
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191 |
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192 def mark_touched(self, filename): |
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193 if 'touched' in vars(self): |
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194 del self.touched |
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195 self._touched.add(filename) |
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196 |
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197 def update_touched(self, filenames): |
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198 for f in filenames: |
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199 self.mark_touched(f) |
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200 |
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201 @util.propertycache |
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202 def copied_from_p1(self): |
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203 return self._p1_copies.copy() |
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204 |
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205 def mark_copied_from_p1(self, source, dest): |
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206 if 'copied_from_p1' in vars(self): |
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207 del self.copied_from_p1 |
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208 self._p1_copies[dest] = source |
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209 |
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210 def update_copies_from_p1(self, copies): |
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211 for dest, source in copies.items(): |
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212 self.mark_copied_from_p1(source, dest) |
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213 |
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214 @util.propertycache |
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215 def copied_from_p2(self): |
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216 return self._p2_copies.copy() |
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217 |
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218 def mark_copied_from_p2(self, source, dest): |
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219 if 'copied_from_p2' in vars(self): |
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220 del self.copied_from_p2 |
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221 self._p2_copies[dest] = source |
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222 |
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223 def update_copies_from_p2(self, copies): |
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224 for dest, source in copies.items(): |
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225 self.mark_copied_from_p2(source, dest) |
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226 |
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227 |
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228 def compute_all_files_changes(ctx): |
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229 """compute the files changed by a revision""" |
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230 p1 = ctx.p1() |
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231 p2 = ctx.p2() |
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232 if p1.rev() == node.nullrev and p2.rev() == node.nullrev: |
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233 return _process_root(ctx) |
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234 elif p1.rev() != node.nullrev and p2.rev() == node.nullrev: |
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235 return _process_linear(p1, ctx) |
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236 elif p1.rev() == node.nullrev and p2.rev() != node.nullrev: |
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237 # In the wild, one can encounter changeset where p1 is null but p2 is not |
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238 return _process_linear(p1, ctx, parent=2) |
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239 elif p1.rev() == p2.rev(): |
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240 # In the wild, one can encounter such "non-merge" |
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241 return _process_linear(p1, ctx) |
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242 else: |
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243 return _process_merge(p1, p2, ctx) |
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244 |
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245 |
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246 def _process_root(ctx): |
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247 """compute the appropriate changed files for a changeset with no parents |
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248 """ |
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249 # Simple, there was nothing before it, so everything is added. |
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250 md = ChangingFiles() |
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251 manifest = ctx.manifest() |
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252 for filename in manifest: |
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253 md.mark_added(filename) |
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254 return md |
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255 |
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256 |
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257 def _process_linear(parent_ctx, children_ctx, parent=1): |
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258 """compute the appropriate changed files for a changeset with a single parent |
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259 """ |
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260 md = ChangingFiles() |
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261 parent_manifest = parent_ctx.manifest() |
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262 children_manifest = children_ctx.manifest() |
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263 |
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264 copies_candidate = [] |
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265 |
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266 for filename, d in parent_manifest.diff(children_manifest).items(): |
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267 if d[1][0] is None: |
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268 # no filenode for the "new" value, file is absent |
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269 md.mark_removed(filename) |
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270 else: |
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271 copies_candidate.append(filename) |
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272 if d[0][0] is None: |
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273 # not filenode for the "old" value file was absent |
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274 md.mark_added(filename) |
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275 else: |
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276 # filenode for both "old" and "new" |
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277 md.mark_touched(filename) |
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278 |
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279 if parent == 1: |
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280 copied = md.mark_copied_from_p1 |
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281 elif parent == 2: |
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282 copied = md.mark_copied_from_p2 |
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283 else: |
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284 assert False, "bad parent value %d" % parent |
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285 |
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286 for filename in copies_candidate: |
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287 copy_info = children_ctx[filename].renamed() |
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288 if copy_info: |
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289 source, srcnode = copy_info |
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290 copied(source, filename) |
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291 |
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292 return md |
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293 |
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294 |
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295 def _process_merge(p1_ctx, p2_ctx, ctx): |
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296 """compute the appropriate changed files for a changeset with two parents |
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297 |
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298 This is a more advance case. The information we need to record is summarise |
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299 in the following table: |
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300 |
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301 ┌──────────────┬──────────────┬──────────────┬──────────────┬──────────────┐ |
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302 │ diff ╲ diff │ ø │ (Some, None) │ (None, Some) │ (Some, Some) │ |
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303 │ p2 ╲ p1 │ │ │ │ │ |
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304 ├──────────────┼──────────────┼──────────────┼──────────────┼──────────────┤ |
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305 │ │ │🄱 No Changes │🄳 No Changes │ │ |
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306 │ ø │🄰 No Changes │ OR │ OR │🄵 No Changes │ |
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307 │ │ │🄲 Deleted[1] │🄴 Salvaged[2]│ [3] │ |
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308 ├──────────────┼──────────────┼──────────────┼──────────────┼──────────────┤ |
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309 │ │🄶 No Changes │ │ │ │ |
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310 │ (Some, None) │ OR │🄻 Deleted │ ø │ ø │ |
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311 │ │🄷 Deleted[1] │ │ │ │ |
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312 ├──────────────┼──────────────┼──────────────┼──────────────┼──────────────┤ |
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313 │ │🄸 No Changes │ │ │ │ |
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314 │ (None, Some) │ OR │ ø │🄼 Added │🄽 Merged │ |
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315 │ │🄹 Salvaged[2]│ │ (copied?) │ (copied?) │ |
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316 ├──────────────┼──────────────┼──────────────┼──────────────┼──────────────┤ |
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317 │ │ │ │ │ │ |
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318 │ (Some, Some) │🄺 No Changes │ ø │🄾 Merged │🄿 Merged │ |
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319 │ │ [3] │ │ (copied?) │ (copied?) │ |
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320 └──────────────┴──────────────┴──────────────┴──────────────┴──────────────┘ |
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321 |
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322 Special case [1]: |
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323 |
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324 The situation is: |
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325 - parent-A: file exists, |
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326 - parent-B: no file, |
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327 - working-copy: no file. |
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328 |
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329 Detecting a "deletion" will depend on the presence of actual change on |
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330 the "parent-A" branch: |
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331 |
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332 Subcase 🄱 or 🄶 : if the state of the file in "parent-A" is unchanged |
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333 compared to the merge ancestors, then parent-A branch left the file |
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334 untouched while parent-B deleted it. We simply apply the change from |
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335 "parent-B" branch the file was automatically dropped. |
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336 The result is: |
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337 - file is not recorded as touched by the merge. |
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338 |
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339 Subcase 🄲 or 🄷 : otherwise, the change from parent-A branch were explicitly dropped and |
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340 the file was "deleted again". From a user perspective, the message |
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341 about "locally changed" while "remotely deleted" (or the other way |
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342 around) was issued and the user chose to deleted the file. |
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343 The result: |
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344 - file is recorded as touched by the merge. |
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345 |
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346 |
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347 Special case [2]: |
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348 |
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349 The situation is: |
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350 - parent-A: no file, |
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351 - parent-B: file, |
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352 - working-copy: file (same content as parent-B). |
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353 |
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354 There are three subcases depending on the ancestors contents: |
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355 |
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356 - A) the file is missing in all ancestors, |
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357 - B) at least one ancestor has the file with filenode ≠ from parent-B, |
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358 - C) all ancestors use the same filenode as parent-B, |
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359 |
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360 Subcase (A) is the simpler, nothing happend on parent-A side while |
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361 parent-B added it. |
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362 |
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363 The result: |
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364 - the file is not marked as touched by the merge. |
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365 |
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366 Subcase (B) is the counter part of "Special case [1]", the file was |
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367 modified on parent-B side, while parent-A side deleted it. However this |
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368 time, the conflict was solved by keeping the file (and its |
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369 modification). We consider the file as "salvaged". |
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370 |
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371 The result: |
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372 - the file is marked as "salvaged" by the merge. |
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373 |
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374 Subcase (C) is subtle variation of the case above. In this case, the |
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375 file in unchanged on the parent-B side and actively removed on the |
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376 parent-A side. So the merge machinery correctly decide it should be |
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377 removed. However, the file was explicitly restored to its parent-B |
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378 content before the merge was commited. The file is be marked |
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379 as salvaged too. From the merge result perspective, this is similar to |
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380 Subcase (B), however from the merge resolution perspective they differ |
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381 since in (C), there was some conflict not obvious solution to the |
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382 merge (That got reversed) |
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383 |
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384 Special case [3]: |
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385 |
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386 The situation is: |
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387 - parent-A: file, |
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388 - parent-B: file (different filenode as parent-A), |
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389 - working-copy: file (same filenode as parent-B). |
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390 |
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391 This case is in theory much simple, for this to happens, this mean the |
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392 filenode in parent-A is purely replacing the one in parent-B (either a |
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393 descendant, or a full new file history, see changeset). So the merge |
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394 introduce no changes, and the file is not affected by the merge... |
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395 |
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396 However, in the wild it is possible to find commit with the above is not |
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397 True. For example repository have some commit where the *new* node is an |
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398 ancestor of the node in parent-A, or where parent-A and parent-B are two |
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399 branches of the same file history, yet not merge-filenode were created |
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400 (while the "merge" should have led to a "modification"). |
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401 |
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402 Detecting such cases (and not recording the file as modified) would be a |
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403 nice bonus. However do not any of this yet. |
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404 """ |
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405 |
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406 md = ChangingFiles() |
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407 |
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408 m = ctx.manifest() |
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409 p1m = p1_ctx.manifest() |
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410 p2m = p2_ctx.manifest() |
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411 diff_p1 = p1m.diff(m) |
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412 diff_p2 = p2m.diff(m) |
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413 |
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414 cahs = ctx.repo().changelog.commonancestorsheads( |
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415 p1_ctx.node(), p2_ctx.node() |
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416 ) |
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417 if not cahs: |
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418 cahs = [node.nullrev] |
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419 mas = [ctx.repo()[r].manifest() for r in cahs] |
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420 |
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421 copy_candidates = [] |
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422 |
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423 # Dealing with case 🄰 happens automatically. Since there are no entry in |
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424 # d1 nor d2, we won't iterate on it ever. |
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425 |
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426 # Iteration over d1 content will deal with all cases, but the one in the |
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427 # first column of the table. |
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428 for filename, d1 in diff_p1.items(): |
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429 |
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430 d2 = diff_p2.pop(filename, None) |
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431 |
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432 if d2 is None: |
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433 # this deal with the first line of the table. |
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434 _process_other_unchanged(md, mas, filename, d1) |
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435 else: |
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436 |
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437 if d1[0][0] is None and d2[0][0] is None: |
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438 # case 🄼 — both deleted the file. |
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439 md.mark_added(filename) |
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440 copy_candidates.append(filename) |
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441 elif d1[1][0] is None and d2[1][0] is None: |
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442 # case 🄻 — both deleted the file. |
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443 md.mark_removed(filename) |
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444 elif d1[1][0] is not None and d2[1][0] is not None: |
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445 # case 🄽 🄾 🄿 |
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446 md.mark_merged(filename) |
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447 copy_candidates.append(filename) |
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448 else: |
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449 # Impossible case, the post-merge file status cannot be None on |
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450 # one side and Something on the other side. |
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451 assert False, "unreachable" |
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452 |
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453 # Iteration over remaining d2 content deal with the first column of the |
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454 # table. |
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455 for filename, d2 in diff_p2.items(): |
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456 _process_other_unchanged(md, mas, filename, d2) |
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457 |
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458 for filename in copy_candidates: |
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459 copy_info = ctx[filename].renamed() |
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460 if copy_info: |
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461 source, srcnode = copy_info |
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462 if source in p1_ctx and p1_ctx[source].filenode() == srcnode: |
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463 md.mark_copied_from_p1(source, filename) |
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464 elif source in p2_ctx and p2_ctx[source].filenode() == srcnode: |
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465 md.mark_copied_from_p2(source, filename) |
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466 return md |
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467 |
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468 |
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469 def _find(manifest, filename): |
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470 """return the associate filenode or None""" |
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471 if filename not in manifest: |
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472 return None |
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473 return manifest.find(filename)[0] |
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474 |
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475 |
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476 def _process_other_unchanged(md, mas, filename, diff): |
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477 source_node = diff[0][0] |
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478 target_node = diff[1][0] |
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479 |
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480 if source_node is not None and target_node is None: |
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481 if any(not _find(ma, filename) == source_node for ma in mas): |
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482 # case 🄲 of 🄷 |
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483 md.mark_removed(filename) |
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484 # else, we have case 🄱 or 🄶 : no change need to be recorded |
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485 elif source_node is None and target_node is not None: |
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486 if any(_find(ma, filename) is not None for ma in mas): |
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487 # case 🄴 or 🄹 |
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488 md.mark_salvaged(filename) |
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489 # else, we have case 🄳 or 🄸 : simple merge without intervention |
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490 elif source_node is not None and target_node is not None: |
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491 # case 🄵 or 🄺 : simple merge without intervention |
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492 # |
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493 # In buggy case where source_node is not an ancestors of target_node. |
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494 # There should have a been a new filenode created, recording this as |
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495 # "modified". We do not deal with them yet. |
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496 pass |
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497 else: |
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498 # An impossible case, the diff algorithm should not return entry if the |
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499 # file is missing on both side. |
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500 assert False, "unreachable" |
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501 |
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502 |
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503 def _missing_from_all_ancestors(mas, filename): |
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504 return all(_find(ma, filename) is None for ma in mas) |
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505 |
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506 |
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507 def computechangesetfilesadded(ctx): |
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508 """return the list of files added in a changeset |
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509 """ |
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510 added = [] |
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511 for f in ctx.files(): |
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512 if not any(f in p for p in ctx.parents()): |
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513 added.append(f) |
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514 return added |
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515 |
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516 |
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517 def get_removal_filter(ctx, x=None): |
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518 """return a function to detect files "wrongly" detected as `removed` |
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519 |
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520 When a file is removed relative to p1 in a merge, this |
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521 function determines whether the absence is due to a |
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522 deletion from a parent, or whether the merge commit |
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523 itself deletes the file. We decide this by doing a |
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524 simplified three way merge of the manifest entry for |
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525 the file. There are two ways we decide the merge |
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526 itself didn't delete a file: |
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527 - neither parent (nor the merge) contain the file |
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528 - exactly one parent contains the file, and that |
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529 parent has the same filelog entry as the merge |
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530 ancestor (or all of them if there two). In other |
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531 words, that parent left the file unchanged while the |
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532 other one deleted it. |
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533 One way to think about this is that deleting a file is |
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534 similar to emptying it, so the list of changed files |
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535 should be similar either way. The computation |
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536 described above is not done directly in _filecommit |
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537 when creating the list of changed files, however |
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538 it does something very similar by comparing filelog |
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539 nodes. |
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540 """ |
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541 |
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542 if x is not None: |
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543 p1, p2, m1, m2 = x |
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544 else: |
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545 p1 = ctx.p1() |
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546 p2 = ctx.p2() |
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547 m1 = p1.manifest() |
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548 m2 = p2.manifest() |
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549 |
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550 @util.cachefunc |
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551 def mas(): |
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552 p1n = p1.node() |
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553 p2n = p2.node() |
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554 cahs = ctx.repo().changelog.commonancestorsheads(p1n, p2n) |
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555 if not cahs: |
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556 cahs = [node.nullrev] |
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557 return [ctx.repo()[r].manifest() for r in cahs] |
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558 |
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559 def deletionfromparent(f): |
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560 if f in m1: |
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561 return f not in m2 and all( |
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562 f in ma and ma.find(f) == m1.find(f) for ma in mas() |
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563 ) |
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564 elif f in m2: |
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565 return all(f in ma and ma.find(f) == m2.find(f) for ma in mas()) |
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566 else: |
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567 return True |
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568 |
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569 return deletionfromparent |
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570 |
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571 |
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572 def computechangesetfilesremoved(ctx): |
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573 """return the list of files removed in a changeset |
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574 """ |
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575 removed = [] |
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576 for f in ctx.files(): |
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577 if f not in ctx: |
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578 removed.append(f) |
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579 if removed: |
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580 rf = get_removal_filter(ctx) |
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581 removed = [r for r in removed if not rf(r)] |
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582 return removed |
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583 |
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584 |
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585 def computechangesetfilesmerged(ctx): |
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586 """return the list of files merged in a changeset |
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587 """ |
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588 merged = [] |
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589 if len(ctx.parents()) < 2: |
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590 return merged |
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591 for f in ctx.files(): |
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592 if f in ctx: |
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593 fctx = ctx[f] |
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594 parents = fctx._filelog.parents(fctx._filenode) |
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595 if parents[1] != node.nullid: |
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596 merged.append(f) |
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597 return merged |
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598 |
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599 |
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600 def computechangesetcopies(ctx): |
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601 """return the copies data for a changeset |
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602 |
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603 The copies data are returned as a pair of dictionnary (p1copies, p2copies). |
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604 |
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605 Each dictionnary are in the form: `{newname: oldname}` |
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606 """ |
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607 p1copies = {} |
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608 p2copies = {} |
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609 p1 = ctx.p1() |
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610 p2 = ctx.p2() |
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611 narrowmatch = ctx._repo.narrowmatch() |
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612 for dst in ctx.files(): |
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613 if not narrowmatch(dst) or dst not in ctx: |
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614 continue |
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615 copied = ctx[dst].renamed() |
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616 if not copied: |
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617 continue |
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618 src, srcnode = copied |
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619 if src in p1 and p1[src].filenode() == srcnode: |
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620 p1copies[dst] = src |
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621 elif src in p2 and p2[src].filenode() == srcnode: |
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622 p2copies[dst] = src |
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623 return p1copies, p2copies |
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624 |
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625 |
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626 def encodecopies(files, copies): |
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627 items = [] |
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628 for i, dst in enumerate(files): |
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629 if dst in copies: |
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630 items.append(b'%d\0%s' % (i, copies[dst])) |
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631 if len(items) != len(copies): |
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632 raise error.ProgrammingError( |
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633 b'some copy targets missing from file list' |
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634 ) |
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635 return b"\n".join(items) |
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636 |
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637 |
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638 def decodecopies(files, data): |
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639 try: |
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640 copies = {} |
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641 if not data: |
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642 return copies |
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643 for l in data.split(b'\n'): |
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644 strindex, src = l.split(b'\0') |
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645 i = int(strindex) |
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646 dst = files[i] |
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647 copies[dst] = src |
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648 return copies |
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649 except (ValueError, IndexError): |
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650 # Perhaps someone had chosen the same key name (e.g. "p1copies") and |
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651 # used different syntax for the value. |
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652 return None |
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653 |
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654 |
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655 def encodefileindices(files, subset): |
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656 subset = set(subset) |
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657 indices = [] |
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658 for i, f in enumerate(files): |
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659 if f in subset: |
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660 indices.append(b'%d' % i) |
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661 return b'\n'.join(indices) |
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662 |
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663 |
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664 def decodefileindices(files, data): |
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665 try: |
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666 subset = [] |
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667 if not data: |
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668 return subset |
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669 for strindex in data.split(b'\n'): |
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670 i = int(strindex) |
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671 if i < 0 or i >= len(files): |
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672 return None |
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673 subset.append(files[i]) |
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674 return subset |
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675 except (ValueError, IndexError): |
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676 # Perhaps someone had chosen the same key name (e.g. "added") and |
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677 # used different syntax for the value. |
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678 return None |
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679 |
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680 |
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681 # see mercurial/helptext/internals/revlogs.txt for details about the format |
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682 |
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683 ACTION_MASK = int("111" "00", 2) |
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684 # note: untouched file used as copy source will as `000` for this mask. |
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685 ADDED_FLAG = int("001" "00", 2) |
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686 MERGED_FLAG = int("010" "00", 2) |
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687 REMOVED_FLAG = int("011" "00", 2) |
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688 # `100` is reserved for future use |
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689 TOUCHED_FLAG = int("101" "00", 2) |
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690 |
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691 COPIED_MASK = int("11", 2) |
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692 COPIED_FROM_P1_FLAG = int("10", 2) |
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693 COPIED_FROM_P2_FLAG = int("11", 2) |
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694 |
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695 # structure is <flag><filename-end><copy-source> |
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696 INDEX_HEADER = struct.Struct(">L") |
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697 INDEX_ENTRY = struct.Struct(">bLL") |
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698 |
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699 |
45569
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700 def encode_files_sidedata(files): |
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701 all_files = set(files.touched - files.salvaged) |
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702 all_files.update(files.copied_from_p1.values()) |
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703 all_files.update(files.copied_from_p2.values()) |
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704 all_files = sorted(all_files) |
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705 file_idx = {f: i for (i, f) in enumerate(all_files)} |
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706 file_idx[None] = 0 |
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707 |
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708 chunks = [INDEX_HEADER.pack(len(all_files))] |
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709 |
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710 filename_length = 0 |
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711 for f in all_files: |
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712 filename_size = len(f) |
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713 filename_length += filename_size |
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714 flag = 0 |
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715 if f in files.added: |
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716 flag |= ADDED_FLAG |
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717 elif f in files.merged: |
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718 flag |= MERGED_FLAG |
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719 elif f in files.removed: |
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720 flag |= REMOVED_FLAG |
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721 elif f in files.touched: |
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722 flag |= TOUCHED_FLAG |
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723 |
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724 copy = None |
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725 if f in files.copied_from_p1: |
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726 flag |= COPIED_FROM_P1_FLAG |
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727 copy = files.copied_from_p1.get(f) |
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728 elif f in files.copied_from_p2: |
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729 copy = files.copied_from_p2.get(f) |
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|
730 flag |= COPIED_FROM_P2_FLAG |
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731 copy_idx = file_idx[copy] |
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732 chunks.append(INDEX_ENTRY.pack(flag, filename_length, copy_idx)) |
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733 chunks.extend(all_files) |
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734 return {sidedatamod.SD_FILES: b''.join(chunks)} |
45325
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|
735 |
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|
736 |
45635
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|
737 def decode_files_sidedata(sidedata): |
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738 md = ChangingFiles() |
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739 raw = sidedata.get(sidedatamod.SD_FILES) |
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740 |
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741 if raw is None: |
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742 return md |
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743 |
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744 copies = [] |
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745 all_files = [] |
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746 |
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747 assert len(raw) >= INDEX_HEADER.size |
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748 total_files = INDEX_HEADER.unpack_from(raw, 0)[0] |
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749 |
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750 offset = INDEX_HEADER.size |
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751 file_offset_base = offset + (INDEX_ENTRY.size * total_files) |
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752 file_offset_last = file_offset_base |
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753 |
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|
754 assert len(raw) >= file_offset_base |
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755 |
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|
756 for idx in range(total_files): |
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757 flag, file_end, copy_idx = INDEX_ENTRY.unpack_from(raw, offset) |
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758 file_end += file_offset_base |
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759 filename = raw[file_offset_last:file_end] |
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760 filesize = file_end - file_offset_last |
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761 assert len(filename) == filesize |
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762 offset += INDEX_ENTRY.size |
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763 file_offset_last = file_end |
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764 all_files.append(filename) |
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765 if flag & ACTION_MASK == ADDED_FLAG: |
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|
766 md.mark_added(filename) |
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767 elif flag & ACTION_MASK == MERGED_FLAG: |
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768 md.mark_merged(filename) |
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769 elif flag & ACTION_MASK == REMOVED_FLAG: |
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770 md.mark_removed(filename) |
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771 elif flag & ACTION_MASK == TOUCHED_FLAG: |
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|
772 md.mark_touched(filename) |
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|
773 |
45634
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774 copied = None |
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775 if flag & COPIED_MASK == COPIED_FROM_P1_FLAG: |
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776 copied = md.mark_copied_from_p1 |
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777 elif flag & COPIED_MASK == COPIED_FROM_P2_FLAG: |
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778 copied = md.mark_copied_from_p2 |
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|
779 |
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780 if copied is not None: |
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781 copies.append((copied, filename, copy_idx)) |
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782 |
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783 for copied, filename, copy_idx in copies: |
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|
784 copied(all_files[copy_idx], filename) |
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785 |
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786 return md |
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787 |
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788 |
44940
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789 def _getsidedata(srcrepo, rev): |
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790 ctx = srcrepo[rev] |
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|
791 files = compute_all_files_changes(ctx) |
45634
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792 return encode_files_sidedata(files) |
44940
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793 |
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794 |
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795 def getsidedataadder(srcrepo, destrepo): |
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796 use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade') |
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797 if pycompat.iswindows or not use_w: |
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798 return _get_simple_sidedata_adder(srcrepo, destrepo) |
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799 else: |
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800 return _get_worker_sidedata_adder(srcrepo, destrepo) |
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801 |
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802 |
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803 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens): |
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804 """The function used by worker precomputing sidedata |
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805 |
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806 It read an input queue containing revision numbers |
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807 It write in an output queue containing (rev, <sidedata-map>) |
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808 |
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809 The `None` input value is used as a stop signal. |
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810 |
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811 The `tokens` semaphore is user to avoid having too many unprocessed |
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812 entries. The workers needs to acquire one token before fetching a task. |
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813 They will be released by the consumer of the produced data. |
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814 """ |
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815 tokens.acquire() |
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816 rev = revs_queue.get() |
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817 while rev is not None: |
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818 data = _getsidedata(srcrepo, rev) |
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819 sidedata_queue.put((rev, data)) |
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820 tokens.acquire() |
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821 rev = revs_queue.get() |
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822 # processing of `None` is completed, release the token. |
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823 tokens.release() |
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824 |
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825 |
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826 BUFF_PER_WORKER = 50 |
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827 |
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|
828 |
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829 def _get_worker_sidedata_adder(srcrepo, destrepo): |
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830 """The parallel version of the sidedata computation |
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831 |
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832 This code spawn a pool of worker that precompute a buffer of sidedata |
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833 before we actually need them""" |
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834 # avoid circular import copies -> scmutil -> worker -> copies |
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835 from . import worker |
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836 |
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837 nbworkers = worker._numworkers(srcrepo.ui) |
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838 |
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839 tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER) |
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840 revsq = multiprocessing.Queue() |
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841 sidedataq = multiprocessing.Queue() |
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842 |
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843 assert srcrepo.filtername is None |
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844 # queue all tasks beforehand, revision numbers are small and it make |
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845 # synchronisation simpler |
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846 # |
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847 # Since the computation for each node can be quite expensive, the overhead |
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848 # of using a single queue is not revelant. In practice, most computation |
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849 # are fast but some are very expensive and dominate all the other smaller |
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850 # cost. |
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851 for r in srcrepo.changelog.revs(): |
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852 revsq.put(r) |
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853 # queue the "no more tasks" markers |
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854 for i in range(nbworkers): |
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855 revsq.put(None) |
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856 |
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857 allworkers = [] |
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858 for i in range(nbworkers): |
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859 args = (srcrepo, revsq, sidedataq, tokens) |
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860 w = multiprocessing.Process(target=_sidedata_worker, args=args) |
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861 allworkers.append(w) |
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862 w.start() |
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863 |
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864 # dictionnary to store results for revision higher than we one we are |
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865 # looking for. For example, if we need the sidedatamap for 42, and 43 is |
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866 # received, when shelve 43 for later use. |
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867 staging = {} |
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868 |
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869 def sidedata_companion(revlog, rev): |
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870 sidedata = {} |
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871 if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog |
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872 # Is the data previously shelved ? |
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873 sidedata = staging.pop(rev, None) |
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874 if sidedata is None: |
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875 # look at the queued result until we find the one we are lookig |
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876 # for (shelve the other ones) |
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877 r, sidedata = sidedataq.get() |
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878 while r != rev: |
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879 staging[r] = sidedata |
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880 r, sidedata = sidedataq.get() |
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881 tokens.release() |
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882 return False, (), sidedata |
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883 |
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884 return sidedata_companion |
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885 |
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886 |
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887 def _get_simple_sidedata_adder(srcrepo, destrepo): |
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888 """The simple version of the sidedata computation |
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889 |
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890 It just compute it in the same thread on request""" |
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891 |
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892 def sidedatacompanion(revlog, rev): |
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893 sidedata = {} |
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894 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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895 sidedata = _getsidedata(srcrepo, rev) |
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896 return False, (), sidedata |
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897 |
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898 return sidedatacompanion |
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899 |
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900 |
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901 def getsidedataremover(srcrepo, destrepo): |
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902 def sidedatacompanion(revlog, rev): |
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903 f = () |
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904 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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905 if revlog.flags(rev) & sidedataflag.REVIDX_SIDEDATA: |
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906 f = ( |
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907 sidedatamod.SD_P1COPIES, |
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908 sidedatamod.SD_P2COPIES, |
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909 sidedatamod.SD_FILESADDED, |
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910 sidedatamod.SD_FILESREMOVED, |
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911 ) |
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912 return False, f, {} |
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913 |
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914 return sidedatacompanion |