Mercurial > hg
annotate mercurial/metadata.py @ 45506:1f50bcc96595
changing-files: document the various sets
The content of some sets (eg: added, removed) is not always obvious so we
document them.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Thu, 17 Sep 2020 11:21:13 +0200 |
parents | c6eea5804551 |
children | df87821081ee |
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 |
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12 from . import ( |
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13 error, |
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14 node, |
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15 pycompat, |
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16 util, |
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17 ) |
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18 |
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19 from .revlogutils import ( |
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20 flagutil as sidedataflag, |
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21 sidedata as sidedatamod, |
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22 ) |
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23 |
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24 |
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25 class ChangingFiles(object): |
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26 """A class recording the changes made to a file by a changeset |
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27 |
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28 Actions performed on files are gathered into 3 sets: |
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29 |
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30 - added: files actively added in the changeset. |
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31 - removed: files removed in the revision |
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32 - touched: files affected by the merge |
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33 |
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34 and copies information is held by 2 mappings |
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35 |
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36 - copied_from_p1: {"<new-name>": "<source-name-in-p1>"} mapping for copies |
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37 - copied_from_p2: {"<new-name>": "<source-name-in-p2>"} mapping for copies |
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38 |
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39 See their inline help for details. |
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40 """ |
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41 |
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42 def __init__( |
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43 self, touched=(), added=(), removed=(), p1_copies=(), p2_copies=(), |
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44 ): |
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45 self._added = set(added) |
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46 self._removed = set(removed) |
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47 self._touched = set(touched) |
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48 self._touched.update(self._added) |
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49 self._touched.update(self._removed) |
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50 self._p1_copies = dict(p1_copies) |
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51 self._p2_copies = dict(p2_copies) |
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52 |
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53 @property |
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54 def added(self): |
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55 """files actively added in the changeset |
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56 |
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57 Any file present in that revision that was absent in all the changeset's |
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58 parents. |
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59 |
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60 In case of merge, this means a file absent in one of the parents but |
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61 existing in the other will *not* be contained in this set. (They were |
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62 added by an ancestor) |
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63 """ |
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64 return frozenset(self._added) |
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65 |
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66 def mark_added(self, filename): |
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67 self._added.add(filename) |
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68 self._touched.add(filename) |
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69 |
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70 def update_added(self, filenames): |
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71 for f in filenames: |
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72 self.mark_added(f) |
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73 |
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74 @property |
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75 def removed(self): |
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76 """files actively removed by the changeset |
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77 |
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78 In case of merge this will only contain the set of files removing "new" |
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79 content. For any file absent in the current changeset: |
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80 |
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81 a) If the file exists in both parents, it is clearly "actively" removed |
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82 by this changeset. |
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83 |
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84 b) If a file exists in only one parent and in none of the common |
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85 ancestors, then the file was newly added in one of the merged branches |
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86 and then got "actively" removed. |
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87 |
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88 c) If a file exists in only one parent and at least one of the common |
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89 ancestors using the same filenode, then the file was unchanged on one |
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90 side and deleted on the other side. The merge "passively" propagated |
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91 that deletion, but didn't "actively" remove the file. In this case the |
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92 file is *not* included in the `removed` set. |
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93 |
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94 d) If a file exists in only one parent and at least one of the common |
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95 ancestors using a different filenode, then the file was changed on one |
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96 side and removed on the other side. The merge process "actively" |
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97 decided to drop the new change and delete the file. Unlike in the |
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98 previous case, (c), the file included in the `removed` set. |
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99 |
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100 Summary table for merge: |
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101 |
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102 case | exists in parents | exists in gca || removed |
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103 (a) | both | * || yes |
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104 (b) | one | none || yes |
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105 (c) | one | same filenode || no |
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106 (d) | one | new filenode || yes |
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107 """ |
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108 return frozenset(self._removed) |
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109 |
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110 def mark_removed(self, filename): |
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111 self._removed.add(filename) |
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112 self._touched.add(filename) |
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113 |
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114 def update_removed(self, filenames): |
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115 for f in filenames: |
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116 self.mark_removed(f) |
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117 |
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118 @property |
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119 def touched(self): |
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120 """files either actively modified, added or removed""" |
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121 return frozenset(self._touched) |
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122 |
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123 def mark_touched(self, filename): |
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124 self._touched.add(filename) |
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125 |
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126 def update_touched(self, filenames): |
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127 for f in filenames: |
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128 self.mark_touched(f) |
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129 |
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130 @property |
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131 def copied_from_p1(self): |
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132 return self._p1_copies.copy() |
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133 |
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134 def mark_copied_from_p1(self, source, dest): |
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135 self._p1_copies[dest] = source |
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136 |
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137 def update_copies_from_p1(self, copies): |
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138 for dest, source in copies.items(): |
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139 self.mark_copied_from_p1(source, dest) |
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140 |
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141 @property |
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142 def copied_from_p2(self): |
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143 return self._p2_copies.copy() |
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144 |
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145 def mark_copied_from_p2(self, source, dest): |
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146 self._p2_copies[dest] = source |
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147 |
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148 def update_copies_from_p2(self, copies): |
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149 for dest, source in copies.items(): |
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150 self.mark_copied_from_p2(source, dest) |
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151 |
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152 |
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153 def computechangesetfilesadded(ctx): |
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154 """return the list of files added in a changeset |
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155 """ |
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156 added = [] |
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157 for f in ctx.files(): |
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158 if not any(f in p for p in ctx.parents()): |
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159 added.append(f) |
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160 return added |
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161 |
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162 |
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163 def get_removal_filter(ctx, x=None): |
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164 """return a function to detect files "wrongly" detected as `removed` |
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165 |
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166 When a file is removed relative to p1 in a merge, this |
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167 function determines whether the absence is due to a |
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168 deletion from a parent, or whether the merge commit |
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169 itself deletes the file. We decide this by doing a |
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170 simplified three way merge of the manifest entry for |
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171 the file. There are two ways we decide the merge |
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172 itself didn't delete a file: |
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173 - neither parent (nor the merge) contain the file |
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174 - exactly one parent contains the file, and that |
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175 parent has the same filelog entry as the merge |
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176 ancestor (or all of them if there two). In other |
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177 words, that parent left the file unchanged while the |
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178 other one deleted it. |
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179 One way to think about this is that deleting a file is |
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180 similar to emptying it, so the list of changed files |
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181 should be similar either way. The computation |
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182 described above is not done directly in _filecommit |
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183 when creating the list of changed files, however |
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184 it does something very similar by comparing filelog |
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185 nodes. |
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186 """ |
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187 |
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188 if x is not None: |
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189 p1, p2, m1, m2 = x |
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190 else: |
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191 p1 = ctx.p1() |
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192 p2 = ctx.p2() |
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193 m1 = p1.manifest() |
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194 m2 = p2.manifest() |
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195 |
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196 @util.cachefunc |
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197 def mas(): |
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198 p1n = p1.node() |
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199 p2n = p2.node() |
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200 cahs = ctx.repo().changelog.commonancestorsheads(p1n, p2n) |
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201 if not cahs: |
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202 cahs = [node.nullrev] |
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203 return [ctx.repo()[r].manifest() for r in cahs] |
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204 |
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205 def deletionfromparent(f): |
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206 if f in m1: |
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207 return f not in m2 and all( |
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208 f in ma and ma.find(f) == m1.find(f) for ma in mas() |
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209 ) |
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210 elif f in m2: |
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211 return all(f in ma and ma.find(f) == m2.find(f) for ma in mas()) |
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212 else: |
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213 return True |
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214 |
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215 return deletionfromparent |
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216 |
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217 |
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218 def computechangesetfilesremoved(ctx): |
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219 """return the list of files removed in a changeset |
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220 """ |
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221 removed = [] |
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222 for f in ctx.files(): |
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223 if f not in ctx: |
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224 removed.append(f) |
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225 if removed: |
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226 rf = get_removal_filter(ctx) |
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227 removed = [r for r in removed if not rf(r)] |
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228 return removed |
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229 |
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230 |
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231 def computechangesetcopies(ctx): |
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232 """return the copies data for a changeset |
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233 |
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234 The copies data are returned as a pair of dictionnary (p1copies, p2copies). |
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235 |
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236 Each dictionnary are in the form: `{newname: oldname}` |
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237 """ |
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238 p1copies = {} |
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239 p2copies = {} |
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240 p1 = ctx.p1() |
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241 p2 = ctx.p2() |
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242 narrowmatch = ctx._repo.narrowmatch() |
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243 for dst in ctx.files(): |
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244 if not narrowmatch(dst) or dst not in ctx: |
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245 continue |
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246 copied = ctx[dst].renamed() |
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247 if not copied: |
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248 continue |
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249 src, srcnode = copied |
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250 if src in p1 and p1[src].filenode() == srcnode: |
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251 p1copies[dst] = src |
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252 elif src in p2 and p2[src].filenode() == srcnode: |
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253 p2copies[dst] = src |
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254 return p1copies, p2copies |
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255 |
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256 |
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257 def encodecopies(files, copies): |
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258 items = [] |
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259 for i, dst in enumerate(files): |
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260 if dst in copies: |
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261 items.append(b'%d\0%s' % (i, copies[dst])) |
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262 if len(items) != len(copies): |
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263 raise error.ProgrammingError( |
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264 b'some copy targets missing from file list' |
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265 ) |
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266 return b"\n".join(items) |
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267 |
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268 |
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269 def decodecopies(files, data): |
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270 try: |
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271 copies = {} |
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272 if not data: |
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273 return copies |
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274 for l in data.split(b'\n'): |
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275 strindex, src = l.split(b'\0') |
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276 i = int(strindex) |
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277 dst = files[i] |
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278 copies[dst] = src |
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279 return copies |
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280 except (ValueError, IndexError): |
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281 # Perhaps someone had chosen the same key name (e.g. "p1copies") and |
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282 # used different syntax for the value. |
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283 return None |
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284 |
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285 |
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286 def encodefileindices(files, subset): |
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287 subset = set(subset) |
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288 indices = [] |
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289 for i, f in enumerate(files): |
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290 if f in subset: |
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291 indices.append(b'%d' % i) |
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292 return b'\n'.join(indices) |
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293 |
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294 |
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295 def decodefileindices(files, data): |
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296 try: |
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297 subset = [] |
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298 if not data: |
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299 return subset |
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300 for strindex in data.split(b'\n'): |
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301 i = int(strindex) |
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302 if i < 0 or i >= len(files): |
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303 return None |
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304 subset.append(files[i]) |
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305 return subset |
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306 except (ValueError, IndexError): |
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307 # Perhaps someone had chosen the same key name (e.g. "added") and |
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308 # used different syntax for the value. |
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309 return None |
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310 |
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311 |
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312 def encode_copies_sidedata(files): |
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313 sortedfiles = sorted(files.touched) |
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314 sidedata = {} |
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315 p1copies = files.copied_from_p1 |
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316 if p1copies: |
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317 p1copies = encodecopies(sortedfiles, p1copies) |
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318 sidedata[sidedatamod.SD_P1COPIES] = p1copies |
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319 p2copies = files.copied_from_p2 |
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320 if p2copies: |
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321 p2copies = encodecopies(sortedfiles, p2copies) |
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322 sidedata[sidedatamod.SD_P2COPIES] = p2copies |
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323 filesadded = files.added |
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324 if filesadded: |
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325 filesadded = encodefileindices(sortedfiles, filesadded) |
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326 sidedata[sidedatamod.SD_FILESADDED] = filesadded |
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327 filesremoved = files.removed |
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328 if filesremoved: |
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329 filesremoved = encodefileindices(sortedfiles, filesremoved) |
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330 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved |
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331 if not sidedata: |
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332 sidedata = None |
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333 return sidedata |
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334 |
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335 |
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336 def _getsidedata(srcrepo, rev): |
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337 ctx = srcrepo[rev] |
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338 filescopies = computechangesetcopies(ctx) |
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339 filesadded = computechangesetfilesadded(ctx) |
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340 filesremoved = computechangesetfilesremoved(ctx) |
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341 sidedata = {} |
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342 if any([filescopies, filesadded, filesremoved]): |
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343 sortedfiles = sorted(ctx.files()) |
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344 p1copies, p2copies = filescopies |
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345 p1copies = encodecopies(sortedfiles, p1copies) |
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346 p2copies = encodecopies(sortedfiles, p2copies) |
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347 filesadded = encodefileindices(sortedfiles, filesadded) |
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348 filesremoved = encodefileindices(sortedfiles, filesremoved) |
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349 if p1copies: |
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350 sidedata[sidedatamod.SD_P1COPIES] = p1copies |
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351 if p2copies: |
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352 sidedata[sidedatamod.SD_P2COPIES] = p2copies |
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353 if filesadded: |
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354 sidedata[sidedatamod.SD_FILESADDED] = filesadded |
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355 if filesremoved: |
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356 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved |
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357 return sidedata |
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358 |
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359 |
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360 def getsidedataadder(srcrepo, destrepo): |
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361 use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade') |
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362 if pycompat.iswindows or not use_w: |
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363 return _get_simple_sidedata_adder(srcrepo, destrepo) |
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364 else: |
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365 return _get_worker_sidedata_adder(srcrepo, destrepo) |
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366 |
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367 |
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368 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens): |
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369 """The function used by worker precomputing sidedata |
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370 |
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371 It read an input queue containing revision numbers |
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372 It write in an output queue containing (rev, <sidedata-map>) |
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373 |
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374 The `None` input value is used as a stop signal. |
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375 |
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376 The `tokens` semaphore is user to avoid having too many unprocessed |
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377 entries. The workers needs to acquire one token before fetching a task. |
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378 They will be released by the consumer of the produced data. |
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379 """ |
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380 tokens.acquire() |
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381 rev = revs_queue.get() |
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382 while rev is not None: |
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383 data = _getsidedata(srcrepo, rev) |
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384 sidedata_queue.put((rev, data)) |
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385 tokens.acquire() |
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386 rev = revs_queue.get() |
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387 # processing of `None` is completed, release the token. |
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388 tokens.release() |
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389 |
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390 |
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391 BUFF_PER_WORKER = 50 |
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392 |
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393 |
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394 def _get_worker_sidedata_adder(srcrepo, destrepo): |
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395 """The parallel version of the sidedata computation |
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396 |
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397 This code spawn a pool of worker that precompute a buffer of sidedata |
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398 before we actually need them""" |
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399 # avoid circular import copies -> scmutil -> worker -> copies |
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400 from . import worker |
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401 |
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402 nbworkers = worker._numworkers(srcrepo.ui) |
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403 |
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404 tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER) |
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405 revsq = multiprocessing.Queue() |
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406 sidedataq = multiprocessing.Queue() |
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407 |
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408 assert srcrepo.filtername is None |
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409 # queue all tasks beforehand, revision numbers are small and it make |
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410 # synchronisation simpler |
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411 # |
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412 # Since the computation for each node can be quite expensive, the overhead |
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413 # of using a single queue is not revelant. In practice, most computation |
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414 # are fast but some are very expensive and dominate all the other smaller |
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415 # cost. |
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416 for r in srcrepo.changelog.revs(): |
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417 revsq.put(r) |
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418 # queue the "no more tasks" markers |
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419 for i in range(nbworkers): |
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420 revsq.put(None) |
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421 |
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422 allworkers = [] |
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423 for i in range(nbworkers): |
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424 args = (srcrepo, revsq, sidedataq, tokens) |
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425 w = multiprocessing.Process(target=_sidedata_worker, args=args) |
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426 allworkers.append(w) |
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427 w.start() |
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428 |
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429 # dictionnary to store results for revision higher than we one we are |
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430 # looking for. For example, if we need the sidedatamap for 42, and 43 is |
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431 # received, when shelve 43 for later use. |
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432 staging = {} |
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433 |
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434 def sidedata_companion(revlog, rev): |
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435 sidedata = {} |
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436 if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog |
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437 # Is the data previously shelved ? |
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438 sidedata = staging.pop(rev, None) |
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439 if sidedata is None: |
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440 # look at the queued result until we find the one we are lookig |
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441 # for (shelve the other ones) |
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442 r, sidedata = sidedataq.get() |
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443 while r != rev: |
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444 staging[r] = sidedata |
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445 r, sidedata = sidedataq.get() |
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446 tokens.release() |
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447 return False, (), sidedata |
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448 |
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449 return sidedata_companion |
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450 |
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451 |
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452 def _get_simple_sidedata_adder(srcrepo, destrepo): |
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453 """The simple version of the sidedata computation |
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454 |
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455 It just compute it in the same thread on request""" |
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456 |
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457 def sidedatacompanion(revlog, rev): |
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458 sidedata = {} |
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459 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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460 sidedata = _getsidedata(srcrepo, rev) |
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461 return False, (), sidedata |
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462 |
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463 return sidedatacompanion |
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464 |
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465 |
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466 def getsidedataremover(srcrepo, destrepo): |
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467 def sidedatacompanion(revlog, rev): |
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468 f = () |
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469 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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470 if revlog.flags(rev) & sidedataflag.REVIDX_SIDEDATA: |
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471 f = ( |
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472 sidedatamod.SD_P1COPIES, |
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473 sidedatamod.SD_P2COPIES, |
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474 sidedatamod.SD_FILESADDED, |
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475 sidedatamod.SD_FILESREMOVED, |
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476 ) |
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477 return False, f, {} |
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478 |
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479 return sidedatacompanion |