Mercurial > hg
annotate mercurial/copies.py @ 44164:45192589555c
copies: extract function for finding directory renames
The directory rename code is logically quite isolated, so it makes
sense to make it physically isolated as well.
Differential Revision: https://phab.mercurial-scm.org/D7977
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Wed, 22 Jan 2020 13:06:56 -0800 |
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1 # copies.py - copy detection for Mercurial |
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2 # |
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3 # Copyright 2008 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import collections |
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11 import multiprocessing |
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12 import os |
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13 |
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14 from .i18n import _ |
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15 |
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16 |
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17 from .revlogutils.flagutil import REVIDX_SIDEDATA |
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18 |
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19 from . import ( |
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20 error, |
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21 match as matchmod, |
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22 node, |
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23 pathutil, |
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24 pycompat, |
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25 util, |
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26 ) |
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27 |
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28 from .revlogutils import sidedata as sidedatamod |
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29 |
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30 from .utils import stringutil |
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31 |
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32 |
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33 def _filter(src, dst, t): |
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34 """filters out invalid copies after chaining""" |
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35 |
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36 # When _chain()'ing copies in 'a' (from 'src' via some other commit 'mid') |
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37 # with copies in 'b' (from 'mid' to 'dst'), we can get the different cases |
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38 # in the following table (not including trivial cases). For example, case 2 |
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39 # is where a file existed in 'src' and remained under that name in 'mid' and |
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40 # then was renamed between 'mid' and 'dst'. |
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41 # |
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42 # case src mid dst result |
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43 # 1 x y - - |
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44 # 2 x y y x->y |
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45 # 3 x y x - |
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46 # 4 x y z x->z |
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47 # 5 - x y - |
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48 # 6 x x y x->y |
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49 # |
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50 # _chain() takes care of chaining the copies in 'a' and 'b', but it |
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51 # cannot tell the difference between cases 1 and 2, between 3 and 4, or |
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52 # between 5 and 6, so it includes all cases in its result. |
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53 # Cases 1, 3, and 5 are then removed by _filter(). |
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54 |
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55 for k, v in list(t.items()): |
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56 # remove copies from files that didn't exist |
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57 if v not in src: |
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58 del t[k] |
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59 # remove criss-crossed copies |
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60 elif k in src and v in dst: |
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61 del t[k] |
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62 # remove copies to files that were then removed |
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63 elif k not in dst: |
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64 del t[k] |
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65 |
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66 |
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67 def _chain(prefix, suffix): |
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68 """chain two sets of copies 'prefix' and 'suffix'""" |
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69 result = prefix.copy() |
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70 for key, value in pycompat.iteritems(suffix): |
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71 result[key] = prefix.get(value, value) |
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72 return result |
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73 |
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74 |
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75 def _tracefile(fctx, am, basemf): |
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76 """return file context that is the ancestor of fctx present in ancestor |
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77 manifest am |
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78 |
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79 Note: we used to try and stop after a given limit, however checking if that |
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80 limit is reached turned out to be very expensive. we are better off |
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81 disabling that feature.""" |
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82 |
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83 for f in fctx.ancestors(): |
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84 path = f.path() |
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85 if am.get(path, None) == f.filenode(): |
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86 return path |
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87 if basemf and basemf.get(path, None) == f.filenode(): |
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88 return path |
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89 |
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90 |
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91 def _dirstatecopies(repo, match=None): |
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92 ds = repo.dirstate |
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93 c = ds.copies().copy() |
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94 for k in list(c): |
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95 if ds[k] not in b'anm' or (match and not match(k)): |
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96 del c[k] |
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97 return c |
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98 |
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99 |
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100 def _computeforwardmissing(a, b, match=None): |
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101 """Computes which files are in b but not a. |
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102 This is its own function so extensions can easily wrap this call to see what |
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103 files _forwardcopies is about to process. |
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104 """ |
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105 ma = a.manifest() |
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106 mb = b.manifest() |
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107 return mb.filesnotin(ma, match=match) |
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108 |
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109 |
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110 def usechangesetcentricalgo(repo): |
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111 """Checks if we should use changeset-centric copy algorithms""" |
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112 if repo.filecopiesmode == b'changeset-sidedata': |
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113 return True |
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114 readfrom = repo.ui.config(b'experimental', b'copies.read-from') |
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115 changesetsource = (b'changeset-only', b'compatibility') |
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116 return readfrom in changesetsource |
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117 |
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118 |
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119 def _committedforwardcopies(a, b, base, match): |
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120 """Like _forwardcopies(), but b.rev() cannot be None (working copy)""" |
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121 # files might have to be traced back to the fctx parent of the last |
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122 # one-side-only changeset, but not further back than that |
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123 repo = a._repo |
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124 |
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125 if usechangesetcentricalgo(repo): |
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126 return _changesetforwardcopies(a, b, match) |
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127 |
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128 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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129 dbg = repo.ui.debug |
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130 if debug: |
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131 dbg(b'debug.copies: looking into rename from %s to %s\n' % (a, b)) |
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132 am = a.manifest() |
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133 basemf = None if base is None else base.manifest() |
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134 |
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135 # find where new files came from |
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136 # we currently don't try to find where old files went, too expensive |
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137 # this means we can miss a case like 'hg rm b; hg cp a b' |
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138 cm = {} |
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139 |
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140 # Computing the forward missing is quite expensive on large manifests, since |
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141 # it compares the entire manifests. We can optimize it in the common use |
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142 # case of computing what copies are in a commit versus its parent (like |
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143 # during a rebase or histedit). Note, we exclude merge commits from this |
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144 # optimization, since the ctx.files() for a merge commit is not correct for |
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145 # this comparison. |
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146 forwardmissingmatch = match |
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147 if b.p1() == a and b.p2().node() == node.nullid: |
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148 filesmatcher = matchmod.exact(b.files()) |
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149 forwardmissingmatch = matchmod.intersectmatchers(match, filesmatcher) |
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150 missing = _computeforwardmissing(a, b, match=forwardmissingmatch) |
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151 |
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152 ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) |
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153 |
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154 if debug: |
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155 dbg(b'debug.copies: missing files to search: %d\n' % len(missing)) |
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156 |
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157 for f in sorted(missing): |
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158 if debug: |
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159 dbg(b'debug.copies: tracing file: %s\n' % f) |
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160 fctx = b[f] |
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161 fctx._ancestrycontext = ancestrycontext |
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162 |
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163 if debug: |
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164 start = util.timer() |
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165 opath = _tracefile(fctx, am, basemf) |
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166 if opath: |
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167 if debug: |
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168 dbg(b'debug.copies: rename of: %s\n' % opath) |
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169 cm[f] = opath |
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170 if debug: |
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171 dbg( |
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172 b'debug.copies: time: %f seconds\n' |
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173 % (util.timer() - start) |
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174 ) |
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175 return cm |
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176 |
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177 |
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178 def _revinfogetter(repo): |
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179 """return a function that return multiple data given a <rev>"i |
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180 |
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181 * p1: revision number of first parent |
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182 * p2: revision number of first parent |
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183 * p1copies: mapping of copies from p1 |
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184 * p2copies: mapping of copies from p2 |
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185 * removed: a list of removed files |
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186 """ |
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187 cl = repo.changelog |
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188 parents = cl.parentrevs |
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189 |
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190 if repo.filecopiesmode == b'changeset-sidedata': |
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191 changelogrevision = cl.changelogrevision |
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192 flags = cl.flags |
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193 |
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194 # A small cache to avoid doing the work twice for merges |
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195 # |
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196 # In the vast majority of cases, if we ask information for a revision |
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197 # about 1 parent, we'll later ask it for the other. So it make sense to |
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198 # keep the information around when reaching the first parent of a merge |
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199 # and dropping it after it was provided for the second parents. |
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200 # |
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201 # It exists cases were only one parent of the merge will be walked. It |
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202 # happens when the "destination" the copy tracing is descendant from a |
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203 # new root, not common with the "source". In that case, we will only walk |
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204 # through merge parents that are descendant of changesets common |
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205 # between "source" and "destination". |
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206 # |
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207 # With the current case implementation if such changesets have a copy |
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208 # information, we'll keep them in memory until the end of |
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209 # _changesetforwardcopies. We don't expect the case to be frequent |
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210 # enough to matters. |
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211 # |
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212 # In addition, it would be possible to reach pathological case, were |
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213 # many first parent are met before any second parent is reached. In |
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214 # that case the cache could grow. If this even become an issue one can |
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215 # safely introduce a maximum cache size. This would trade extra CPU/IO |
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216 # time to save memory. |
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217 merge_caches = {} |
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218 |
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219 def revinfo(rev): |
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220 p1, p2 = parents(rev) |
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221 if flags(rev) & REVIDX_SIDEDATA: |
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222 e = merge_caches.pop(rev, None) |
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223 if e is not None: |
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224 return e |
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225 c = changelogrevision(rev) |
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226 p1copies = c.p1copies |
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227 p2copies = c.p2copies |
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228 removed = c.filesremoved |
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229 if p1 != node.nullrev and p2 != node.nullrev: |
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230 # XXX some case we over cache, IGNORE |
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231 merge_caches[rev] = (p1, p2, p1copies, p2copies, removed) |
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232 else: |
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233 p1copies = {} |
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234 p2copies = {} |
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235 removed = [] |
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236 return p1, p2, p1copies, p2copies, removed |
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237 |
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238 else: |
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239 |
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240 def revinfo(rev): |
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241 p1, p2 = parents(rev) |
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242 ctx = repo[rev] |
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243 p1copies, p2copies = ctx._copies |
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244 removed = ctx.filesremoved() |
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245 return p1, p2, p1copies, p2copies, removed |
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246 |
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247 return revinfo |
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248 |
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249 |
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250 def _changesetforwardcopies(a, b, match): |
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251 if a.rev() in (node.nullrev, b.rev()): |
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252 return {} |
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253 |
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254 repo = a.repo().unfiltered() |
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255 children = {} |
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256 revinfo = _revinfogetter(repo) |
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257 |
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258 cl = repo.changelog |
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259 missingrevs = cl.findmissingrevs(common=[a.rev()], heads=[b.rev()]) |
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260 mrset = set(missingrevs) |
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261 roots = set() |
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262 for r in missingrevs: |
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263 for p in cl.parentrevs(r): |
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264 if p == node.nullrev: |
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265 continue |
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266 if p not in children: |
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267 children[p] = [r] |
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268 else: |
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269 children[p].append(r) |
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270 if p not in mrset: |
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271 roots.add(p) |
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272 if not roots: |
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273 # no common revision to track copies from |
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274 return {} |
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275 min_root = min(roots) |
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276 |
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277 from_head = set( |
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278 cl.reachableroots(min_root, [b.rev()], list(roots), includepath=True) |
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279 ) |
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280 |
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281 iterrevs = set(from_head) |
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282 iterrevs &= mrset |
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283 iterrevs.update(roots) |
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284 iterrevs.remove(b.rev()) |
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285 revs = sorted(iterrevs) |
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286 return _combinechangesetcopies(revs, children, b.rev(), revinfo, match) |
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287 |
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288 |
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289 def _combinechangesetcopies(revs, children, targetrev, revinfo, match): |
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290 """combine the copies information for each item of iterrevs |
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291 |
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292 revs: sorted iterable of revision to visit |
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293 children: a {parent: [children]} mapping. |
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294 targetrev: the final copies destination revision (not in iterrevs) |
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295 revinfo(rev): a function that return (p1, p2, p1copies, p2copies, removed) |
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296 match: a matcher |
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297 |
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298 It returns the aggregated copies information for `targetrev`. |
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299 """ |
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300 all_copies = {} |
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301 alwaysmatch = match.always() |
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302 for r in revs: |
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303 copies = all_copies.pop(r, None) |
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304 if copies is None: |
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305 # this is a root |
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306 copies = {} |
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307 for i, c in enumerate(children[r]): |
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308 p1, p2, p1copies, p2copies, removed = revinfo(c) |
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309 if r == p1: |
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310 parent = 1 |
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311 childcopies = p1copies |
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312 else: |
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313 assert r == p2 |
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314 parent = 2 |
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315 childcopies = p2copies |
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316 if not alwaysmatch: |
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317 childcopies = { |
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318 dst: src for dst, src in childcopies.items() if match(dst) |
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319 } |
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320 newcopies = copies |
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321 if childcopies: |
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322 newcopies = _chain(newcopies, childcopies) |
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323 # _chain makes a copies, we can avoid doing so in some |
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324 # simple/linear cases. |
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325 assert newcopies is not copies |
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326 for f in removed: |
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327 if f in newcopies: |
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328 if newcopies is copies: |
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329 # copy on write to avoid affecting potential other |
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330 # branches. when there are no other branches, this |
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331 # could be avoided. |
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332 newcopies = copies.copy() |
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333 del newcopies[f] |
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334 othercopies = all_copies.get(c) |
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335 if othercopies is None: |
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336 all_copies[c] = newcopies |
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337 else: |
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338 # we are the second parent to work on c, we need to merge our |
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339 # work with the other. |
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340 # |
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341 # Unlike when copies are stored in the filelog, we consider |
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342 # it a copy even if the destination already existed on the |
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343 # other branch. It's simply too expensive to check if the |
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344 # file existed in the manifest. |
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345 # |
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346 # In case of conflict, parent 1 take precedence over parent 2. |
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347 # This is an arbitrary choice made anew when implementing |
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348 # changeset based copies. It was made without regards with |
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349 # potential filelog related behavior. |
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350 if parent == 1: |
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351 othercopies.update(newcopies) |
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352 else: |
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353 newcopies.update(othercopies) |
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354 all_copies[c] = newcopies |
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355 return all_copies[targetrev] |
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356 |
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357 |
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358 def _forwardcopies(a, b, base=None, match=None): |
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359 """find {dst@b: src@a} copy mapping where a is an ancestor of b""" |
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360 |
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361 if base is None: |
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362 base = a |
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363 match = a.repo().narrowmatch(match) |
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364 # check for working copy |
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365 if b.rev() is None: |
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366 cm = _committedforwardcopies(a, b.p1(), base, match) |
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367 # combine copies from dirstate if necessary |
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368 copies = _chain(cm, _dirstatecopies(b._repo, match)) |
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369 else: |
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370 copies = _committedforwardcopies(a, b, base, match) |
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371 return copies |
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372 |
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373 |
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374 def _backwardrenames(a, b, match): |
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375 if a._repo.ui.config(b'experimental', b'copytrace') == b'off': |
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376 return {} |
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377 |
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378 # Even though we're not taking copies into account, 1:n rename situations |
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379 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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380 # arbitrarily pick one of the renames. |
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381 # We don't want to pass in "match" here, since that would filter |
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382 # the destination by it. Since we're reversing the copies, we want |
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383 # to filter the source instead. |
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384 f = _forwardcopies(b, a) |
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385 r = {} |
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386 for k, v in sorted(pycompat.iteritems(f)): |
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387 if match and not match(v): |
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388 continue |
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389 # remove copies |
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390 if v in a: |
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391 continue |
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392 r[v] = k |
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393 return r |
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394 |
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395 |
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396 def pathcopies(x, y, match=None): |
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397 """find {dst@y: src@x} copy mapping for directed compare""" |
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398 repo = x._repo |
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399 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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400 if debug: |
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401 repo.ui.debug( |
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402 b'debug.copies: searching copies from %s to %s\n' % (x, y) |
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403 ) |
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404 if x == y or not x or not y: |
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405 return {} |
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406 a = y.ancestor(x) |
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407 if a == x: |
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408 if debug: |
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409 repo.ui.debug(b'debug.copies: search mode: forward\n') |
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410 if y.rev() is None and x == y.p1(): |
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411 # short-circuit to avoid issues with merge states |
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412 return _dirstatecopies(repo, match) |
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413 copies = _forwardcopies(x, y, match=match) |
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414 elif a == y: |
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415 if debug: |
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416 repo.ui.debug(b'debug.copies: search mode: backward\n') |
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417 copies = _backwardrenames(x, y, match=match) |
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418 else: |
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419 if debug: |
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420 repo.ui.debug(b'debug.copies: search mode: combined\n') |
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421 base = None |
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422 if a.rev() != node.nullrev: |
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423 base = x |
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424 copies = _chain( |
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425 _backwardrenames(x, a, match=match), |
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426 _forwardcopies(a, y, base, match=match), |
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427 ) |
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428 _filter(x, y, copies) |
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429 return copies |
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430 |
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431 |
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432 def mergecopies(repo, c1, c2, base): |
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433 """ |
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434 Finds moves and copies between context c1 and c2 that are relevant for |
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435 merging. 'base' will be used as the merge base. |
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436 |
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437 Copytracing is used in commands like rebase, merge, unshelve, etc to merge |
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438 files that were moved/ copied in one merge parent and modified in another. |
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439 For example: |
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440 |
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441 o ---> 4 another commit |
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442 | |
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443 | o ---> 3 commit that modifies a.txt |
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444 | / |
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445 o / ---> 2 commit that moves a.txt to b.txt |
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446 |/ |
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447 o ---> 1 merge base |
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448 |
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449 If we try to rebase revision 3 on revision 4, since there is no a.txt in |
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450 revision 4, and if user have copytrace disabled, we prints the following |
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451 message: |
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452 |
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453 ```other changed <file> which local deleted``` |
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454 |
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455 Returns five dicts: "copy", "movewithdir", "diverge", "renamedelete" and |
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456 "dirmove". |
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457 |
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458 "copy" is a mapping from destination name -> source name, |
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459 where source is in c1 and destination is in c2 or vice-versa. |
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460 |
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461 "movewithdir" is a mapping from source name -> destination name, |
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462 where the file at source present in one context but not the other |
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463 needs to be moved to destination by the merge process, because the |
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464 other context moved the directory it is in. |
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465 |
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466 "diverge" is a mapping of source name -> list of destination names |
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467 for divergent renames. |
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468 |
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469 "renamedelete" is a mapping of source name -> list of destination |
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470 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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471 |
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472 "dirmove" is a mapping of detected source dir -> destination dir renames. |
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473 This is needed for handling changes to new files previously grafted into |
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474 renamed directories. |
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475 |
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476 This function calls different copytracing algorithms based on config. |
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477 """ |
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478 # avoid silly behavior for update from empty dir |
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479 if not c1 or not c2 or c1 == c2: |
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480 return {}, {}, {}, {}, {} |
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481 |
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482 narrowmatch = c1.repo().narrowmatch() |
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483 |
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484 # avoid silly behavior for parent -> working dir |
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485 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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486 return _dirstatecopies(repo, narrowmatch), {}, {}, {}, {} |
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487 |
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488 copytracing = repo.ui.config(b'experimental', b'copytrace') |
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489 if stringutil.parsebool(copytracing) is False: |
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490 # stringutil.parsebool() returns None when it is unable to parse the |
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491 # value, so we should rely on making sure copytracing is on such cases |
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492 return {}, {}, {}, {}, {} |
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493 |
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494 if usechangesetcentricalgo(repo): |
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495 # The heuristics don't make sense when we need changeset-centric algos |
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496 return _fullcopytracing(repo, c1, c2, base) |
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497 |
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498 # Copy trace disabling is explicitly below the node == p1 logic above |
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499 # because the logic above is required for a simple copy to be kept across a |
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500 # rebase. |
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501 if copytracing == b'heuristics': |
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502 # Do full copytracing if only non-public revisions are involved as |
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503 # that will be fast enough and will also cover the copies which could |
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504 # be missed by heuristics |
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505 if _isfullcopytraceable(repo, c1, base): |
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506 return _fullcopytracing(repo, c1, c2, base) |
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507 return _heuristicscopytracing(repo, c1, c2, base) |
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508 else: |
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509 return _fullcopytracing(repo, c1, c2, base) |
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510 |
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511 |
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512 def _isfullcopytraceable(repo, c1, base): |
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513 """ Checks that if base, source and destination are all no-public branches, |
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514 if yes let's use the full copytrace algorithm for increased capabilities |
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515 since it will be fast enough. |
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516 |
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517 `experimental.copytrace.sourcecommitlimit` can be used to set a limit for |
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518 number of changesets from c1 to base such that if number of changesets are |
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519 more than the limit, full copytracing algorithm won't be used. |
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520 """ |
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521 if c1.rev() is None: |
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522 c1 = c1.p1() |
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523 if c1.mutable() and base.mutable(): |
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524 sourcecommitlimit = repo.ui.configint( |
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525 b'experimental', b'copytrace.sourcecommitlimit' |
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526 ) |
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527 commits = len(repo.revs(b'%d::%d', base.rev(), c1.rev())) |
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528 return commits < sourcecommitlimit |
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529 return False |
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530 |
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531 |
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532 def _checksinglesidecopies( |
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533 src, dsts1, m1, m2, mb, c2, base, copy, renamedelete |
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534 ): |
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535 if src not in m2: |
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536 # deleted on side 2 |
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537 if src not in m1: |
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538 # renamed on side 1, deleted on side 2 |
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539 renamedelete[src] = dsts1 |
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540 elif m2[src] != mb[src]: |
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541 if not _related(c2[src], base[src]): |
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542 return |
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543 # modified on side 2 |
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544 for dst in dsts1: |
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545 if dst not in m2: |
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546 # dst not added on side 2 (handle as regular |
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547 # "both created" case in manifestmerge otherwise) |
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548 copy[dst] = src |
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549 |
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550 |
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551 def _fullcopytracing(repo, c1, c2, base): |
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552 """ The full copytracing algorithm which finds all the new files that were |
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553 added from merge base up to the top commit and for each file it checks if |
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554 this file was copied from another file. |
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555 |
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556 This is pretty slow when a lot of changesets are involved but will track all |
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557 the copies. |
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558 """ |
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559 m1 = c1.manifest() |
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560 m2 = c2.manifest() |
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561 mb = base.manifest() |
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562 |
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563 copies1 = pathcopies(base, c1) |
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564 copies2 = pathcopies(base, c2) |
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565 |
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566 if not (copies1 or copies2): |
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567 return {}, {}, {}, {}, {} |
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568 |
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569 inversecopies1 = {} |
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570 inversecopies2 = {} |
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571 for dst, src in copies1.items(): |
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572 inversecopies1.setdefault(src, []).append(dst) |
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573 for dst, src in copies2.items(): |
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574 inversecopies2.setdefault(src, []).append(dst) |
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575 |
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576 copy = {} |
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577 diverge = {} |
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578 renamedelete = {} |
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579 allsources = set(inversecopies1) | set(inversecopies2) |
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580 for src in allsources: |
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581 dsts1 = inversecopies1.get(src) |
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582 dsts2 = inversecopies2.get(src) |
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583 if dsts1 and dsts2: |
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584 # copied/renamed on both sides |
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585 if src not in m1 and src not in m2: |
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586 # renamed on both sides |
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587 dsts1 = set(dsts1) |
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588 dsts2 = set(dsts2) |
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589 # If there's some overlap in the rename destinations, we |
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590 # consider it not divergent. For example, if side 1 copies 'a' |
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591 # to 'b' and 'c' and deletes 'a', and side 2 copies 'a' to 'c' |
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592 # and 'd' and deletes 'a'. |
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593 if dsts1 & dsts2: |
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594 for dst in dsts1 & dsts2: |
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595 copy[dst] = src |
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596 else: |
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597 diverge[src] = sorted(dsts1 | dsts2) |
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598 elif src in m1 and src in m2: |
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599 # copied on both sides |
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600 dsts1 = set(dsts1) |
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601 dsts2 = set(dsts2) |
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602 for dst in dsts1 & dsts2: |
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603 copy[dst] = src |
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604 # TODO: Handle cases where it was renamed on one side and copied |
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605 # on the other side |
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606 elif dsts1: |
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607 # copied/renamed only on side 1 |
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608 _checksinglesidecopies( |
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609 src, dsts1, m1, m2, mb, c2, base, copy, renamedelete |
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610 ) |
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611 elif dsts2: |
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612 # copied/renamed only on side 2 |
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613 _checksinglesidecopies( |
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614 src, dsts2, m2, m1, mb, c1, base, copy, renamedelete |
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615 ) |
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616 |
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617 # find interesting file sets from manifests |
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618 addedinm1 = m1.filesnotin(mb, repo.narrowmatch()) |
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619 addedinm2 = m2.filesnotin(mb, repo.narrowmatch()) |
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620 u1 = sorted(addedinm1 - addedinm2) |
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621 u2 = sorted(addedinm2 - addedinm1) |
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622 |
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623 header = b" unmatched files in %s" |
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624 if u1: |
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625 repo.ui.debug(b"%s:\n %s\n" % (header % b'local', b"\n ".join(u1))) |
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626 if u2: |
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627 repo.ui.debug(b"%s:\n %s\n" % (header % b'other', b"\n ".join(u2))) |
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628 |
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629 fullcopy = copies1.copy() |
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630 fullcopy.update(copies2) |
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631 |
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632 if repo.ui.debugflag: |
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633 renamedeleteset = set() |
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634 divergeset = set() |
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635 for dsts in diverge.values(): |
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636 divergeset.update(dsts) |
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637 for dsts in renamedelete.values(): |
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638 renamedeleteset.update(dsts) |
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639 |
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640 repo.ui.debug( |
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641 b" all copies found (* = to merge, ! = divergent, " |
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642 b"% = renamed and deleted):\n" |
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643 ) |
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644 for f in sorted(fullcopy): |
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645 note = b"" |
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646 if f in copy: |
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647 note += b"*" |
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648 if f in divergeset: |
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649 note += b"!" |
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650 if f in renamedeleteset: |
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651 note += b"%" |
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652 repo.ui.debug( |
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653 b" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, note) |
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654 ) |
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655 del renamedeleteset |
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656 del divergeset |
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657 |
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658 repo.ui.debug(b" checking for directory renames\n") |
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659 |
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660 dirmove, movewithdir = _dir_renames(repo, c1, c2, copy, fullcopy, u1, u2) |
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661 |
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662 return copy, movewithdir, diverge, renamedelete, dirmove |
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663 |
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664 |
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665 def _dir_renames(repo, c1, c2, copy, fullcopy, u1, u2): |
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666 # generate a directory move map |
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667 d1, d2 = c1.dirs(), c2.dirs() |
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668 invalid = set() |
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669 dirmove = {} |
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670 |
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671 # examine each file copy for a potential directory move, which is |
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672 # when all the files in a directory are moved to a new directory |
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673 for dst, src in pycompat.iteritems(fullcopy): |
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674 dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst) |
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675 if dsrc in invalid: |
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676 # already seen to be uninteresting |
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677 continue |
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678 elif dsrc in d1 and ddst in d1: |
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679 # directory wasn't entirely moved locally |
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680 invalid.add(dsrc) |
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681 elif dsrc in d2 and ddst in d2: |
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682 # directory wasn't entirely moved remotely |
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683 invalid.add(dsrc) |
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684 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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685 # files from the same directory moved to two different places |
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686 invalid.add(dsrc) |
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687 else: |
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688 # looks good so far |
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689 dirmove[dsrc] = ddst |
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690 |
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691 for i in invalid: |
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692 if i in dirmove: |
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693 del dirmove[i] |
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694 del d1, d2, invalid |
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695 |
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696 if not dirmove: |
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697 return {}, {} |
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698 |
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699 dirmove = {k + b"/": v + b"/" for k, v in pycompat.iteritems(dirmove)} |
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700 |
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701 for d in dirmove: |
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702 repo.ui.debug( |
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703 b" discovered dir src: '%s' -> dst: '%s'\n" % (d, dirmove[d]) |
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704 ) |
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705 |
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706 movewithdir = {} |
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707 # check unaccounted nonoverlapping files against directory moves |
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708 for f in u1 + u2: |
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709 if f not in fullcopy: |
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710 for d in dirmove: |
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711 if f.startswith(d): |
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712 # new file added in a directory that was moved, move it |
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713 df = dirmove[d] + f[len(d) :] |
6426
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|
714 if df not in copy: |
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715 movewithdir[f] = df |
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716 repo.ui.debug( |
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717 b" pending file src: '%s' -> dst: '%s'\n" |
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718 % (f, df) |
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719 ) |
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|
720 break |
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|
721 |
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722 return dirmove, movewithdir |
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|
723 |
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724 |
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725 def _heuristicscopytracing(repo, c1, c2, base): |
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726 """ Fast copytracing using filename heuristics |
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727 |
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728 Assumes that moves or renames are of following two types: |
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729 |
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730 1) Inside a directory only (same directory name but different filenames) |
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731 2) Move from one directory to another |
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732 (same filenames but different directory names) |
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733 |
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734 Works only when there are no merge commits in the "source branch". |
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735 Source branch is commits from base up to c2 not including base. |
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736 |
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737 If merge is involved it fallbacks to _fullcopytracing(). |
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738 |
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739 Can be used by setting the following config: |
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740 |
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741 [experimental] |
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742 copytrace = heuristics |
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743 |
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744 In some cases the copy/move candidates found by heuristics can be very large |
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745 in number and that will make the algorithm slow. The number of possible |
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746 candidates to check can be limited by using the config |
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747 `experimental.copytrace.movecandidateslimit` which defaults to 100. |
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748 """ |
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749 |
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750 if c1.rev() is None: |
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751 c1 = c1.p1() |
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752 if c2.rev() is None: |
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753 c2 = c2.p1() |
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754 |
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755 copies = {} |
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756 |
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757 changedfiles = set() |
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758 m1 = c1.manifest() |
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759 if not repo.revs(b'%d::%d', base.rev(), c2.rev()): |
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760 # If base is not in c2 branch, we switch to fullcopytracing |
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761 repo.ui.debug( |
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762 b"switching to full copytracing as base is not " |
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763 b"an ancestor of c2\n" |
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764 ) |
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765 return _fullcopytracing(repo, c1, c2, base) |
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766 |
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767 ctx = c2 |
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768 while ctx != base: |
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769 if len(ctx.parents()) == 2: |
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770 # To keep things simple let's not handle merges |
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771 repo.ui.debug(b"switching to full copytracing because of merges\n") |
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772 return _fullcopytracing(repo, c1, c2, base) |
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773 changedfiles.update(ctx.files()) |
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774 ctx = ctx.p1() |
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775 |
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776 cp = _forwardcopies(base, c2) |
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777 for dst, src in pycompat.iteritems(cp): |
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778 if src in m1: |
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779 copies[dst] = src |
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780 |
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781 # file is missing if it isn't present in the destination, but is present in |
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782 # the base and present in the source. |
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783 # Presence in the base is important to exclude added files, presence in the |
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784 # source is important to exclude removed files. |
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785 filt = lambda f: f not in m1 and f in base and f in c2 |
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786 missingfiles = [f for f in changedfiles if filt(f)] |
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787 |
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788 if missingfiles: |
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789 basenametofilename = collections.defaultdict(list) |
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790 dirnametofilename = collections.defaultdict(list) |
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791 |
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792 for f in m1.filesnotin(base.manifest()): |
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793 basename = os.path.basename(f) |
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794 dirname = os.path.dirname(f) |
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795 basenametofilename[basename].append(f) |
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796 dirnametofilename[dirname].append(f) |
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797 |
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798 for f in missingfiles: |
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799 basename = os.path.basename(f) |
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800 dirname = os.path.dirname(f) |
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801 samebasename = basenametofilename[basename] |
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802 samedirname = dirnametofilename[dirname] |
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803 movecandidates = samebasename + samedirname |
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804 # f is guaranteed to be present in c2, that's why |
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805 # c2.filectx(f) won't fail |
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806 f2 = c2.filectx(f) |
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807 # we can have a lot of candidates which can slow down the heuristics |
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808 # config value to limit the number of candidates moves to check |
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809 maxcandidates = repo.ui.configint( |
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810 b'experimental', b'copytrace.movecandidateslimit' |
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811 ) |
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812 |
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813 if len(movecandidates) > maxcandidates: |
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814 repo.ui.status( |
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815 _( |
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816 b"skipping copytracing for '%s', more " |
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817 b"candidates than the limit: %d\n" |
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818 ) |
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819 % (f, len(movecandidates)) |
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820 ) |
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821 continue |
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822 |
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823 for candidate in movecandidates: |
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824 f1 = c1.filectx(candidate) |
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825 if _related(f1, f2): |
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826 # if there are a few related copies then we'll merge |
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827 # changes into all of them. This matches the behaviour |
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828 # of upstream copytracing |
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829 copies[candidate] = f |
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830 |
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831 return copies, {}, {}, {}, {} |
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832 |
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833 |
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834 def _related(f1, f2): |
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835 """return True if f1 and f2 filectx have a common ancestor |
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836 |
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837 Walk back to common ancestor to see if the two files originate |
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838 from the same file. Since workingfilectx's rev() is None it messes |
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839 up the integer comparison logic, hence the pre-step check for |
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840 None (f1 and f2 can only be workingfilectx's initially). |
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841 """ |
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842 |
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843 if f1 == f2: |
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844 return True # a match |
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845 |
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846 g1, g2 = f1.ancestors(), f2.ancestors() |
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847 try: |
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848 f1r, f2r = f1.linkrev(), f2.linkrev() |
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849 |
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850 if f1r is None: |
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851 f1 = next(g1) |
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852 if f2r is None: |
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853 f2 = next(g2) |
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854 |
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855 while True: |
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856 f1r, f2r = f1.linkrev(), f2.linkrev() |
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857 if f1r > f2r: |
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858 f1 = next(g1) |
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859 elif f2r > f1r: |
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860 f2 = next(g2) |
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861 else: # f1 and f2 point to files in the same linkrev |
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862 return f1 == f2 # true if they point to the same file |
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863 except StopIteration: |
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864 return False |
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865 |
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866 |
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867 def graftcopies(wctx, ctx, base): |
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868 """reproduce copies between base and ctx in the wctx |
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869 |
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870 Unlike mergecopies(), this function will only consider copies between base |
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871 and ctx; it will ignore copies between base and wctx. Also unlike |
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872 mergecopies(), this function will apply copies to the working copy (instead |
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873 of just returning information about the copies). That makes it cheaper |
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874 (especially in the common case of base==ctx.p1()) and useful also when |
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875 experimental.copytrace=off. |
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876 |
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877 merge.update() will have already marked most copies, but it will only |
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878 mark copies if it thinks the source files are related (see |
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879 merge._related()). It will also not mark copies if the file wasn't modified |
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880 on the local side. This function adds the copies that were "missed" |
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881 by merge.update(). |
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882 """ |
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883 new_copies = pathcopies(base, ctx) |
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884 _filter(wctx.p1(), wctx, new_copies) |
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885 for dst, src in pycompat.iteritems(new_copies): |
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886 wctx[dst].markcopied(src) |
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887 |
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888 |
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889 def computechangesetfilesadded(ctx): |
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890 """return the list of files added in a changeset |
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891 """ |
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892 added = [] |
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893 for f in ctx.files(): |
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894 if not any(f in p for p in ctx.parents()): |
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895 added.append(f) |
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896 return added |
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897 |
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898 |
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899 def computechangesetfilesremoved(ctx): |
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900 """return the list of files removed in a changeset |
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901 """ |
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902 removed = [] |
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903 for f in ctx.files(): |
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904 if f not in ctx: |
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905 removed.append(f) |
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906 return removed |
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907 |
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908 |
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909 def computechangesetcopies(ctx): |
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910 """return the copies data for a changeset |
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911 |
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912 The copies data are returned as a pair of dictionnary (p1copies, p2copies). |
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|
913 |
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914 Each dictionnary are in the form: `{newname: oldname}` |
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915 """ |
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916 p1copies = {} |
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917 p2copies = {} |
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918 p1 = ctx.p1() |
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919 p2 = ctx.p2() |
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920 narrowmatch = ctx._repo.narrowmatch() |
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921 for dst in ctx.files(): |
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922 if not narrowmatch(dst) or dst not in ctx: |
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923 continue |
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924 copied = ctx[dst].renamed() |
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925 if not copied: |
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|
926 continue |
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927 src, srcnode = copied |
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928 if src in p1 and p1[src].filenode() == srcnode: |
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|
929 p1copies[dst] = src |
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930 elif src in p2 and p2[src].filenode() == srcnode: |
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|
931 p2copies[dst] = src |
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932 return p1copies, p2copies |
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933 |
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934 |
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935 def encodecopies(files, copies): |
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936 items = [] |
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937 for i, dst in enumerate(files): |
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938 if dst in copies: |
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939 items.append(b'%d\0%s' % (i, copies[dst])) |
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940 if len(items) != len(copies): |
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|
941 raise error.ProgrammingError( |
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|
942 b'some copy targets missing from file list' |
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|
943 ) |
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944 return b"\n".join(items) |
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|
945 |
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|
946 |
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|
947 def decodecopies(files, data): |
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|
948 try: |
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|
949 copies = {} |
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950 if not data: |
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951 return copies |
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952 for l in data.split(b'\n'): |
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953 strindex, src = l.split(b'\0') |
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954 i = int(strindex) |
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955 dst = files[i] |
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956 copies[dst] = src |
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957 return copies |
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958 except (ValueError, IndexError): |
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959 # Perhaps someone had chosen the same key name (e.g. "p1copies") and |
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960 # used different syntax for the value. |
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961 return None |
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|
962 |
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963 |
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964 def encodefileindices(files, subset): |
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965 subset = set(subset) |
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966 indices = [] |
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967 for i, f in enumerate(files): |
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968 if f in subset: |
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969 indices.append(b'%d' % i) |
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970 return b'\n'.join(indices) |
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971 |
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|
972 |
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|
973 def decodefileindices(files, data): |
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974 try: |
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975 subset = [] |
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976 if not data: |
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977 return subset |
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978 for strindex in data.split(b'\n'): |
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979 i = int(strindex) |
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980 if i < 0 or i >= len(files): |
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981 return None |
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982 subset.append(files[i]) |
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983 return subset |
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984 except (ValueError, IndexError): |
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985 # Perhaps someone had chosen the same key name (e.g. "added") and |
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986 # used different syntax for the value. |
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987 return None |
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988 |
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989 |
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990 def _getsidedata(srcrepo, rev): |
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991 ctx = srcrepo[rev] |
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992 filescopies = computechangesetcopies(ctx) |
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993 filesadded = computechangesetfilesadded(ctx) |
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994 filesremoved = computechangesetfilesremoved(ctx) |
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995 sidedata = {} |
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996 if any([filescopies, filesadded, filesremoved]): |
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997 sortedfiles = sorted(ctx.files()) |
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998 p1copies, p2copies = filescopies |
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999 p1copies = encodecopies(sortedfiles, p1copies) |
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1000 p2copies = encodecopies(sortedfiles, p2copies) |
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1001 filesadded = encodefileindices(sortedfiles, filesadded) |
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1002 filesremoved = encodefileindices(sortedfiles, filesremoved) |
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1003 if p1copies: |
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1004 sidedata[sidedatamod.SD_P1COPIES] = p1copies |
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1005 if p2copies: |
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1006 sidedata[sidedatamod.SD_P2COPIES] = p2copies |
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1007 if filesadded: |
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1008 sidedata[sidedatamod.SD_FILESADDED] = filesadded |
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1009 if filesremoved: |
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1010 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved |
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1011 return sidedata |
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1012 |
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1013 |
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1014 def getsidedataadder(srcrepo, destrepo): |
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1015 use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade') |
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1016 if pycompat.iswindows or not use_w: |
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1017 return _get_simple_sidedata_adder(srcrepo, destrepo) |
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1018 else: |
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1019 return _get_worker_sidedata_adder(srcrepo, destrepo) |
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1020 |
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1021 |
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1022 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens): |
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1023 """The function used by worker precomputing sidedata |
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1024 |
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1025 It read an input queue containing revision numbers |
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1026 It write in an output queue containing (rev, <sidedata-map>) |
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1027 |
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1028 The `None` input value is used as a stop signal. |
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1029 |
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1030 The `tokens` semaphore is user to avoid having too many unprocessed |
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1031 entries. The workers needs to acquire one token before fetching a task. |
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1032 They will be released by the consumer of the produced data. |
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1033 """ |
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1034 tokens.acquire() |
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1035 rev = revs_queue.get() |
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1036 while rev is not None: |
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1037 data = _getsidedata(srcrepo, rev) |
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1038 sidedata_queue.put((rev, data)) |
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1039 tokens.acquire() |
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1040 rev = revs_queue.get() |
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1041 # processing of `None` is completed, release the token. |
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1042 tokens.release() |
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1043 |
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1044 |
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1045 BUFF_PER_WORKER = 50 |
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1046 |
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1047 |
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1048 def _get_worker_sidedata_adder(srcrepo, destrepo): |
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1049 """The parallel version of the sidedata computation |
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1050 |
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1051 This code spawn a pool of worker that precompute a buffer of sidedata |
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1052 before we actually need them""" |
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1053 # avoid circular import copies -> scmutil -> worker -> copies |
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1054 from . import worker |
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1055 |
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1056 nbworkers = worker._numworkers(srcrepo.ui) |
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1057 |
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1058 tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER) |
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1059 revsq = multiprocessing.Queue() |
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1060 sidedataq = multiprocessing.Queue() |
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1061 |
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1062 assert srcrepo.filtername is None |
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1063 # queue all tasks beforehand, revision numbers are small and it make |
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1064 # synchronisation simpler |
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1065 # |
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1066 # Since the computation for each node can be quite expensive, the overhead |
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1067 # of using a single queue is not revelant. In practice, most computation |
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1068 # are fast but some are very expensive and dominate all the other smaller |
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1069 # cost. |
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1070 for r in srcrepo.changelog.revs(): |
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1071 revsq.put(r) |
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1072 # queue the "no more tasks" markers |
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1073 for i in range(nbworkers): |
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1074 revsq.put(None) |
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1075 |
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1076 allworkers = [] |
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1077 for i in range(nbworkers): |
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1078 args = (srcrepo, revsq, sidedataq, tokens) |
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1079 w = multiprocessing.Process(target=_sidedata_worker, args=args) |
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1080 allworkers.append(w) |
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1081 w.start() |
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1082 |
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1083 # dictionnary to store results for revision higher than we one we are |
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1084 # looking for. For example, if we need the sidedatamap for 42, and 43 is |
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1085 # received, when shelve 43 for later use. |
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1086 staging = {} |
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1087 |
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1088 def sidedata_companion(revlog, rev): |
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1089 sidedata = {} |
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1090 if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog |
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1091 # Is the data previously shelved ? |
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1092 sidedata = staging.pop(rev, None) |
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1093 if sidedata is None: |
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1094 # look at the queued result until we find the one we are lookig |
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1095 # for (shelve the other ones) |
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1096 r, sidedata = sidedataq.get() |
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1097 while r != rev: |
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1098 staging[r] = sidedata |
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1099 r, sidedata = sidedataq.get() |
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1100 tokens.release() |
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1101 return False, (), sidedata |
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1102 |
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1103 return sidedata_companion |
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1104 |
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1105 |
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1106 def _get_simple_sidedata_adder(srcrepo, destrepo): |
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1107 """The simple version of the sidedata computation |
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1108 |
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1109 It just compute it in the same thread on request""" |
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1110 |
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1111 def sidedatacompanion(revlog, rev): |
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1112 sidedata = {} |
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1113 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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1114 sidedata = _getsidedata(srcrepo, rev) |
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1115 return False, (), sidedata |
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1116 |
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1117 return sidedatacompanion |
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1118 |
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1119 |
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1120 def getsidedataremover(srcrepo, destrepo): |
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1121 def sidedatacompanion(revlog, rev): |
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1122 f = () |
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1123 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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1124 if revlog.flags(rev) & REVIDX_SIDEDATA: |
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1125 f = ( |
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1126 sidedatamod.SD_P1COPIES, |
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1127 sidedatamod.SD_P2COPIES, |
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1128 sidedatamod.SD_FILESADDED, |
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1129 sidedatamod.SD_FILESREMOVED, |
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1130 ) |
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1131 return False, f, {} |
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1132 |
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1133 return sidedatacompanion |