Mercurial > hg
annotate mercurial/metadata.py @ 45323:aea6a812f7cb
commitctx: return a richer object from _prepare_files
Instead of returning a lot of different list, we introduce a rich object that
hold all the file related information. The unique object help with data
consistency and simply functions arguments and return.
In the rest of this series we will increase usage of this object to simplify
more code.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sat, 25 Jul 2020 15:49:12 +0200 |
parents | 25512a65cefd |
children | c6eea5804551 |
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 revision |
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27 """ |
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28 |
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29 def __init__( |
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30 self, touched=(), added=(), removed=(), p1_copies=(), p2_copies=(), |
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31 ): |
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32 self._added = set(added) |
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33 self._removed = set(removed) |
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34 self._touched = set(touched) |
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35 self._touched.update(self._added) |
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36 self._touched.update(self._removed) |
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37 self._p1_copies = dict(p1_copies) |
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38 self._p2_copies = dict(p2_copies) |
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39 |
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40 @property |
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41 def added(self): |
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42 return frozenset(self._added) |
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43 |
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44 def mark_added(self, filename): |
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45 self._added.add(filename) |
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46 self._touched.add(filename) |
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47 |
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48 def update_added(self, filenames): |
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49 for f in filenames: |
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50 self.mark_added(f) |
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51 |
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52 @property |
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53 def removed(self): |
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54 return frozenset(self._removed) |
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55 |
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56 def mark_removed(self, filename): |
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57 self._removed.add(filename) |
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58 self._touched.add(filename) |
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59 |
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60 def update_removed(self, filenames): |
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61 for f in filenames: |
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62 self.mark_removed(f) |
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63 |
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64 @property |
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65 def touched(self): |
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66 return frozenset(self._touched) |
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67 |
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68 def mark_touched(self, filename): |
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69 self._touched.add(filename) |
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70 |
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71 def update_touched(self, filenames): |
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72 for f in filenames: |
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73 self.mark_touched(f) |
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74 |
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75 @property |
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76 def copied_from_p1(self): |
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77 return self._p1_copies.copy() |
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78 |
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79 def mark_copied_from_p1(self, source, dest): |
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80 self._p1_copies[dest] = source |
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81 |
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82 def update_copies_from_p1(self, copies): |
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83 for dest, source in copies.items(): |
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84 self.mark_copied_from_p1(source, dest) |
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85 |
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86 @property |
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87 def copied_from_p2(self): |
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88 return self._p2_copies.copy() |
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89 |
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90 def mark_copied_from_p2(self, source, dest): |
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91 self._p2_copies[dest] = source |
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92 |
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93 def update_copies_from_p2(self, copies): |
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94 for dest, source in copies.items(): |
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95 self.mark_copied_from_p2(source, dest) |
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96 |
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97 |
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98 def computechangesetfilesadded(ctx): |
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99 """return the list of files added in a changeset |
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100 """ |
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101 added = [] |
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102 for f in ctx.files(): |
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103 if not any(f in p for p in ctx.parents()): |
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104 added.append(f) |
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105 return added |
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106 |
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107 |
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108 def get_removal_filter(ctx, x=None): |
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109 """return a function to detect files "wrongly" detected as `removed` |
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110 |
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111 When a file is removed relative to p1 in a merge, this |
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112 function determines whether the absence is due to a |
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113 deletion from a parent, or whether the merge commit |
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114 itself deletes the file. We decide this by doing a |
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115 simplified three way merge of the manifest entry for |
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116 the file. There are two ways we decide the merge |
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117 itself didn't delete a file: |
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118 - neither parent (nor the merge) contain the file |
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119 - exactly one parent contains the file, and that |
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120 parent has the same filelog entry as the merge |
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121 ancestor (or all of them if there two). In other |
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122 words, that parent left the file unchanged while the |
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123 other one deleted it. |
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124 One way to think about this is that deleting a file is |
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125 similar to emptying it, so the list of changed files |
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126 should be similar either way. The computation |
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127 described above is not done directly in _filecommit |
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128 when creating the list of changed files, however |
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129 it does something very similar by comparing filelog |
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130 nodes. |
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131 """ |
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132 |
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133 if x is not None: |
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134 p1, p2, m1, m2 = x |
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135 else: |
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136 p1 = ctx.p1() |
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137 p2 = ctx.p2() |
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138 m1 = p1.manifest() |
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139 m2 = p2.manifest() |
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140 |
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141 @util.cachefunc |
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142 def mas(): |
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143 p1n = p1.node() |
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144 p2n = p2.node() |
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145 cahs = ctx.repo().changelog.commonancestorsheads(p1n, p2n) |
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146 if not cahs: |
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147 cahs = [node.nullrev] |
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148 return [ctx.repo()[r].manifest() for r in cahs] |
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149 |
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150 def deletionfromparent(f): |
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151 if f in m1: |
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152 return f not in m2 and all( |
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153 f in ma and ma.find(f) == m1.find(f) for ma in mas() |
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154 ) |
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155 elif f in m2: |
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156 return all(f in ma and ma.find(f) == m2.find(f) for ma in mas()) |
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157 else: |
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158 return True |
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159 |
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160 return deletionfromparent |
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161 |
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162 |
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163 def computechangesetfilesremoved(ctx): |
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164 """return the list of files removed in a changeset |
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165 """ |
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166 removed = [] |
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167 for f in ctx.files(): |
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168 if f not in ctx: |
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169 removed.append(f) |
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170 if removed: |
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171 rf = get_removal_filter(ctx) |
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172 removed = [r for r in removed if not rf(r)] |
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173 return removed |
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174 |
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175 |
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176 def computechangesetcopies(ctx): |
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177 """return the copies data for a changeset |
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178 |
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179 The copies data are returned as a pair of dictionnary (p1copies, p2copies). |
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180 |
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181 Each dictionnary are in the form: `{newname: oldname}` |
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182 """ |
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183 p1copies = {} |
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184 p2copies = {} |
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185 p1 = ctx.p1() |
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186 p2 = ctx.p2() |
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187 narrowmatch = ctx._repo.narrowmatch() |
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188 for dst in ctx.files(): |
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189 if not narrowmatch(dst) or dst not in ctx: |
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190 continue |
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191 copied = ctx[dst].renamed() |
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192 if not copied: |
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193 continue |
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194 src, srcnode = copied |
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195 if src in p1 and p1[src].filenode() == srcnode: |
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196 p1copies[dst] = src |
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197 elif src in p2 and p2[src].filenode() == srcnode: |
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198 p2copies[dst] = src |
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199 return p1copies, p2copies |
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200 |
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201 |
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202 def encodecopies(files, copies): |
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203 items = [] |
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204 for i, dst in enumerate(files): |
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205 if dst in copies: |
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206 items.append(b'%d\0%s' % (i, copies[dst])) |
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207 if len(items) != len(copies): |
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208 raise error.ProgrammingError( |
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209 b'some copy targets missing from file list' |
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210 ) |
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211 return b"\n".join(items) |
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212 |
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213 |
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214 def decodecopies(files, data): |
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215 try: |
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216 copies = {} |
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217 if not data: |
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218 return copies |
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219 for l in data.split(b'\n'): |
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220 strindex, src = l.split(b'\0') |
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221 i = int(strindex) |
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222 dst = files[i] |
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223 copies[dst] = src |
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224 return copies |
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225 except (ValueError, IndexError): |
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226 # Perhaps someone had chosen the same key name (e.g. "p1copies") and |
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227 # used different syntax for the value. |
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228 return None |
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229 |
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230 |
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231 def encodefileindices(files, subset): |
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232 subset = set(subset) |
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233 indices = [] |
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234 for i, f in enumerate(files): |
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235 if f in subset: |
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236 indices.append(b'%d' % i) |
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237 return b'\n'.join(indices) |
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238 |
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239 |
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240 def decodefileindices(files, data): |
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241 try: |
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242 subset = [] |
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243 if not data: |
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244 return subset |
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245 for strindex in data.split(b'\n'): |
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246 i = int(strindex) |
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247 if i < 0 or i >= len(files): |
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248 return None |
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249 subset.append(files[i]) |
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250 return subset |
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251 except (ValueError, IndexError): |
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252 # Perhaps someone had chosen the same key name (e.g. "added") and |
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253 # used different syntax for the value. |
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254 return None |
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255 |
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256 |
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257 def _getsidedata(srcrepo, rev): |
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258 ctx = srcrepo[rev] |
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259 filescopies = computechangesetcopies(ctx) |
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260 filesadded = computechangesetfilesadded(ctx) |
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261 filesremoved = computechangesetfilesremoved(ctx) |
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262 sidedata = {} |
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263 if any([filescopies, filesadded, filesremoved]): |
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264 sortedfiles = sorted(ctx.files()) |
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265 p1copies, p2copies = filescopies |
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266 p1copies = encodecopies(sortedfiles, p1copies) |
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267 p2copies = encodecopies(sortedfiles, p2copies) |
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268 filesadded = encodefileindices(sortedfiles, filesadded) |
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269 filesremoved = encodefileindices(sortedfiles, filesremoved) |
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270 if p1copies: |
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271 sidedata[sidedatamod.SD_P1COPIES] = p1copies |
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272 if p2copies: |
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273 sidedata[sidedatamod.SD_P2COPIES] = p2copies |
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274 if filesadded: |
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275 sidedata[sidedatamod.SD_FILESADDED] = filesadded |
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276 if filesremoved: |
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277 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved |
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278 return sidedata |
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279 |
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280 |
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281 def getsidedataadder(srcrepo, destrepo): |
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282 use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade') |
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283 if pycompat.iswindows or not use_w: |
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284 return _get_simple_sidedata_adder(srcrepo, destrepo) |
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285 else: |
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286 return _get_worker_sidedata_adder(srcrepo, destrepo) |
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287 |
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288 |
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289 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens): |
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290 """The function used by worker precomputing sidedata |
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291 |
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292 It read an input queue containing revision numbers |
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293 It write in an output queue containing (rev, <sidedata-map>) |
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294 |
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295 The `None` input value is used as a stop signal. |
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296 |
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297 The `tokens` semaphore is user to avoid having too many unprocessed |
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298 entries. The workers needs to acquire one token before fetching a task. |
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299 They will be released by the consumer of the produced data. |
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300 """ |
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301 tokens.acquire() |
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302 rev = revs_queue.get() |
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303 while rev is not None: |
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304 data = _getsidedata(srcrepo, rev) |
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305 sidedata_queue.put((rev, data)) |
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306 tokens.acquire() |
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307 rev = revs_queue.get() |
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308 # processing of `None` is completed, release the token. |
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309 tokens.release() |
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310 |
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311 |
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312 BUFF_PER_WORKER = 50 |
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313 |
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314 |
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315 def _get_worker_sidedata_adder(srcrepo, destrepo): |
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316 """The parallel version of the sidedata computation |
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317 |
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318 This code spawn a pool of worker that precompute a buffer of sidedata |
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319 before we actually need them""" |
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320 # avoid circular import copies -> scmutil -> worker -> copies |
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321 from . import worker |
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322 |
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323 nbworkers = worker._numworkers(srcrepo.ui) |
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324 |
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325 tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER) |
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326 revsq = multiprocessing.Queue() |
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327 sidedataq = multiprocessing.Queue() |
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328 |
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329 assert srcrepo.filtername is None |
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330 # queue all tasks beforehand, revision numbers are small and it make |
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331 # synchronisation simpler |
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332 # |
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333 # Since the computation for each node can be quite expensive, the overhead |
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334 # of using a single queue is not revelant. In practice, most computation |
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335 # are fast but some are very expensive and dominate all the other smaller |
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336 # cost. |
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337 for r in srcrepo.changelog.revs(): |
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338 revsq.put(r) |
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339 # queue the "no more tasks" markers |
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340 for i in range(nbworkers): |
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341 revsq.put(None) |
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342 |
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343 allworkers = [] |
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344 for i in range(nbworkers): |
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345 args = (srcrepo, revsq, sidedataq, tokens) |
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346 w = multiprocessing.Process(target=_sidedata_worker, args=args) |
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347 allworkers.append(w) |
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348 w.start() |
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349 |
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350 # dictionnary to store results for revision higher than we one we are |
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351 # looking for. For example, if we need the sidedatamap for 42, and 43 is |
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352 # received, when shelve 43 for later use. |
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353 staging = {} |
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354 |
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355 def sidedata_companion(revlog, rev): |
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356 sidedata = {} |
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357 if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog |
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358 # Is the data previously shelved ? |
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359 sidedata = staging.pop(rev, None) |
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360 if sidedata is None: |
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361 # look at the queued result until we find the one we are lookig |
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362 # for (shelve the other ones) |
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363 r, sidedata = sidedataq.get() |
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364 while r != rev: |
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365 staging[r] = sidedata |
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366 r, sidedata = sidedataq.get() |
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367 tokens.release() |
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368 return False, (), sidedata |
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369 |
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370 return sidedata_companion |
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371 |
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372 |
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373 def _get_simple_sidedata_adder(srcrepo, destrepo): |
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374 """The simple version of the sidedata computation |
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375 |
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376 It just compute it in the same thread on request""" |
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377 |
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378 def sidedatacompanion(revlog, rev): |
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379 sidedata = {} |
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380 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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381 sidedata = _getsidedata(srcrepo, rev) |
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382 return False, (), sidedata |
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383 |
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384 return sidedatacompanion |
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385 |
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386 |
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387 def getsidedataremover(srcrepo, destrepo): |
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388 def sidedatacompanion(revlog, rev): |
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389 f = () |
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390 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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391 if revlog.flags(rev) & sidedataflag.REVIDX_SIDEDATA: |
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392 f = ( |
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393 sidedatamod.SD_P1COPIES, |
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394 sidedatamod.SD_P2COPIES, |
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395 sidedatamod.SD_FILESADDED, |
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396 sidedatamod.SD_FILESREMOVED, |
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397 ) |
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398 return False, f, {} |
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399 |
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400 return sidedatacompanion |