Mercurial > hg
annotate mercurial/metadata.py @ 45325:c6eea5804551
commitctx: extract sidedata encoding inside its own function
This part of the code is quite independent from the rest. Thank to the new
ChangingFiles object, moving with the rest of the sidedata code (in metadata.py)
is simple.
The changelog.add method is simply passing the `files` object to the new
function. It will be easy to increase/change the data we gather and encode
without impacting the changelog method.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sat, 25 Jul 2020 16:02:26 +0200 |
parents | aea6a812f7cb |
children | 1f50bcc96595 |
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 encode_copies_sidedata(files): |
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258 sortedfiles = sorted(files.touched) |
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259 sidedata = {} |
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260 p1copies = files.copied_from_p1 |
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261 if p1copies: |
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262 p1copies = encodecopies(sortedfiles, p1copies) |
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263 sidedata[sidedatamod.SD_P1COPIES] = p1copies |
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264 p2copies = files.copied_from_p2 |
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265 if p2copies: |
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266 p2copies = encodecopies(sortedfiles, p2copies) |
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267 sidedata[sidedatamod.SD_P2COPIES] = p2copies |
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268 filesadded = files.added |
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269 if filesadded: |
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270 filesadded = encodefileindices(sortedfiles, filesadded) |
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271 sidedata[sidedatamod.SD_FILESADDED] = filesadded |
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272 filesremoved = files.removed |
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273 if filesremoved: |
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274 filesremoved = encodefileindices(sortedfiles, filesremoved) |
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275 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved |
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276 if not sidedata: |
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277 sidedata = None |
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278 return sidedata |
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279 |
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280 |
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281 def _getsidedata(srcrepo, rev): |
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282 ctx = srcrepo[rev] |
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283 filescopies = computechangesetcopies(ctx) |
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284 filesadded = computechangesetfilesadded(ctx) |
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285 filesremoved = computechangesetfilesremoved(ctx) |
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286 sidedata = {} |
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287 if any([filescopies, filesadded, filesremoved]): |
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288 sortedfiles = sorted(ctx.files()) |
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289 p1copies, p2copies = filescopies |
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290 p1copies = encodecopies(sortedfiles, p1copies) |
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291 p2copies = encodecopies(sortedfiles, p2copies) |
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292 filesadded = encodefileindices(sortedfiles, filesadded) |
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293 filesremoved = encodefileindices(sortedfiles, filesremoved) |
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294 if p1copies: |
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295 sidedata[sidedatamod.SD_P1COPIES] = p1copies |
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296 if p2copies: |
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297 sidedata[sidedatamod.SD_P2COPIES] = p2copies |
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298 if filesadded: |
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299 sidedata[sidedatamod.SD_FILESADDED] = filesadded |
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300 if filesremoved: |
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301 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved |
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302 return sidedata |
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303 |
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304 |
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305 def getsidedataadder(srcrepo, destrepo): |
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306 use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade') |
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307 if pycompat.iswindows or not use_w: |
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308 return _get_simple_sidedata_adder(srcrepo, destrepo) |
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309 else: |
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310 return _get_worker_sidedata_adder(srcrepo, destrepo) |
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311 |
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312 |
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313 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens): |
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314 """The function used by worker precomputing sidedata |
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315 |
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316 It read an input queue containing revision numbers |
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317 It write in an output queue containing (rev, <sidedata-map>) |
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318 |
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319 The `None` input value is used as a stop signal. |
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320 |
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321 The `tokens` semaphore is user to avoid having too many unprocessed |
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322 entries. The workers needs to acquire one token before fetching a task. |
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323 They will be released by the consumer of the produced data. |
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324 """ |
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325 tokens.acquire() |
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326 rev = revs_queue.get() |
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327 while rev is not None: |
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328 data = _getsidedata(srcrepo, rev) |
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329 sidedata_queue.put((rev, data)) |
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330 tokens.acquire() |
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331 rev = revs_queue.get() |
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332 # processing of `None` is completed, release the token. |
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333 tokens.release() |
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334 |
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335 |
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336 BUFF_PER_WORKER = 50 |
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337 |
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338 |
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339 def _get_worker_sidedata_adder(srcrepo, destrepo): |
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340 """The parallel version of the sidedata computation |
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341 |
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342 This code spawn a pool of worker that precompute a buffer of sidedata |
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343 before we actually need them""" |
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344 # avoid circular import copies -> scmutil -> worker -> copies |
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345 from . import worker |
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346 |
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347 nbworkers = worker._numworkers(srcrepo.ui) |
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348 |
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349 tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER) |
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350 revsq = multiprocessing.Queue() |
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351 sidedataq = multiprocessing.Queue() |
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352 |
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353 assert srcrepo.filtername is None |
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354 # queue all tasks beforehand, revision numbers are small and it make |
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355 # synchronisation simpler |
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356 # |
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357 # Since the computation for each node can be quite expensive, the overhead |
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358 # of using a single queue is not revelant. In practice, most computation |
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359 # are fast but some are very expensive and dominate all the other smaller |
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360 # cost. |
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361 for r in srcrepo.changelog.revs(): |
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362 revsq.put(r) |
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363 # queue the "no more tasks" markers |
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364 for i in range(nbworkers): |
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365 revsq.put(None) |
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366 |
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367 allworkers = [] |
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368 for i in range(nbworkers): |
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369 args = (srcrepo, revsq, sidedataq, tokens) |
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370 w = multiprocessing.Process(target=_sidedata_worker, args=args) |
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371 allworkers.append(w) |
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372 w.start() |
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373 |
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374 # dictionnary to store results for revision higher than we one we are |
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375 # looking for. For example, if we need the sidedatamap for 42, and 43 is |
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376 # received, when shelve 43 for later use. |
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377 staging = {} |
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378 |
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379 def sidedata_companion(revlog, rev): |
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380 sidedata = {} |
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381 if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog |
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382 # Is the data previously shelved ? |
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383 sidedata = staging.pop(rev, None) |
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384 if sidedata is None: |
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385 # look at the queued result until we find the one we are lookig |
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386 # for (shelve the other ones) |
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387 r, sidedata = sidedataq.get() |
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388 while r != rev: |
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389 staging[r] = sidedata |
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390 r, sidedata = sidedataq.get() |
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391 tokens.release() |
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392 return False, (), sidedata |
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393 |
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394 return sidedata_companion |
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395 |
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396 |
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397 def _get_simple_sidedata_adder(srcrepo, destrepo): |
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398 """The simple version of the sidedata computation |
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399 |
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400 It just compute it in the same thread on request""" |
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401 |
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402 def sidedatacompanion(revlog, rev): |
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403 sidedata = {} |
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404 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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405 sidedata = _getsidedata(srcrepo, rev) |
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406 return False, (), sidedata |
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407 |
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408 return sidedatacompanion |
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409 |
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410 |
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411 def getsidedataremover(srcrepo, destrepo): |
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412 def sidedatacompanion(revlog, rev): |
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413 f = () |
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414 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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415 if revlog.flags(rev) & sidedataflag.REVIDX_SIDEDATA: |
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416 f = ( |
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417 sidedatamod.SD_P1COPIES, |
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418 sidedatamod.SD_P2COPIES, |
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419 sidedatamod.SD_FILESADDED, |
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420 sidedatamod.SD_FILESREMOVED, |
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421 ) |
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422 return False, f, {} |
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423 |
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424 return sidedatacompanion |