Mercurial > hg
annotate mercurial/copies.py @ 43255:b8d60845fa5d
copies: extract data extraction into a `revinfo` function
The function is build once at the beginning of the algorithm and used fetch
appropriate information for each revision.
This abstracts some implementation details from the main algorithm and will help
us to access the data more efficiently in future changesets.
Differential Revision: https://phab.mercurial-scm.org/D7070
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 02 Oct 2019 17:42:01 -0400 |
parents | 181d28ba05da |
children | 00de32aa834e |
rev | line source |
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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 heapq |
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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(a, b): |
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68 """chain two sets of copies 'a' and 'b'""" |
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69 t = a.copy() |
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70 for k, v in pycompat.iteritems(b): |
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71 if v in t: |
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72 t[k] = t[v] |
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73 else: |
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74 t[k] = v |
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75 return t |
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76 |
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77 |
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78 def _tracefile(fctx, am, basemf): |
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79 """return file context that is the ancestor of fctx present in ancestor |
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80 manifest am |
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81 |
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82 Note: we used to try and stop after a given limit, however checking if that |
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83 limit is reached turned out to be very expensive. we are better off |
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84 disabling that feature.""" |
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85 |
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86 for f in fctx.ancestors(): |
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87 path = f.path() |
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88 if am.get(path, None) == f.filenode(): |
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89 return path |
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90 if basemf and basemf.get(path, None) == f.filenode(): |
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91 return path |
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92 |
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93 |
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94 def _dirstatecopies(repo, match=None): |
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95 ds = repo.dirstate |
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96 c = ds.copies().copy() |
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97 for k in list(c): |
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98 if ds[k] not in b'anm' or (match and not match(k)): |
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99 del c[k] |
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100 return c |
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101 |
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102 |
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103 def _computeforwardmissing(a, b, match=None): |
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104 """Computes which files are in b but not a. |
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105 This is its own function so extensions can easily wrap this call to see what |
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106 files _forwardcopies is about to process. |
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107 """ |
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108 ma = a.manifest() |
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109 mb = b.manifest() |
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110 return mb.filesnotin(ma, match=match) |
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111 |
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112 |
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113 def usechangesetcentricalgo(repo): |
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114 """Checks if we should use changeset-centric copy algorithms""" |
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115 if repo.filecopiesmode == b'changeset-sidedata': |
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116 return True |
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117 readfrom = repo.ui.config(b'experimental', b'copies.read-from') |
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118 changesetsource = (b'changeset-only', b'compatibility') |
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119 return readfrom in changesetsource |
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120 |
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121 |
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122 def _committedforwardcopies(a, b, base, match): |
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123 """Like _forwardcopies(), but b.rev() cannot be None (working copy)""" |
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124 # files might have to be traced back to the fctx parent of the last |
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125 # one-side-only changeset, but not further back than that |
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126 repo = a._repo |
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127 |
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128 if usechangesetcentricalgo(repo): |
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129 return _changesetforwardcopies(a, b, match) |
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130 |
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131 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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132 dbg = repo.ui.debug |
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133 if debug: |
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134 dbg(b'debug.copies: looking into rename from %s to %s\n' % (a, b)) |
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135 am = a.manifest() |
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136 basemf = None if base is None else base.manifest() |
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137 |
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138 # find where new files came from |
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139 # we currently don't try to find where old files went, too expensive |
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140 # this means we can miss a case like 'hg rm b; hg cp a b' |
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141 cm = {} |
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142 |
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143 # Computing the forward missing is quite expensive on large manifests, since |
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144 # it compares the entire manifests. We can optimize it in the common use |
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145 # case of computing what copies are in a commit versus its parent (like |
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146 # during a rebase or histedit). Note, we exclude merge commits from this |
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147 # optimization, since the ctx.files() for a merge commit is not correct for |
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148 # this comparison. |
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149 forwardmissingmatch = match |
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150 if b.p1() == a and b.p2().node() == node.nullid: |
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151 filesmatcher = matchmod.exact(b.files()) |
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152 forwardmissingmatch = matchmod.intersectmatchers(match, filesmatcher) |
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153 missing = _computeforwardmissing(a, b, match=forwardmissingmatch) |
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154 |
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155 ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) |
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156 |
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157 if debug: |
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158 dbg(b'debug.copies: missing files to search: %d\n' % len(missing)) |
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159 |
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160 for f in sorted(missing): |
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161 if debug: |
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162 dbg(b'debug.copies: tracing file: %s\n' % f) |
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163 fctx = b[f] |
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164 fctx._ancestrycontext = ancestrycontext |
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165 |
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166 if debug: |
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167 start = util.timer() |
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168 opath = _tracefile(fctx, am, basemf) |
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169 if opath: |
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170 if debug: |
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171 dbg(b'debug.copies: rename of: %s\n' % opath) |
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172 cm[f] = opath |
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173 if debug: |
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174 dbg( |
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175 b'debug.copies: time: %f seconds\n' |
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176 % (util.timer() - start) |
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177 ) |
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178 return cm |
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179 |
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180 |
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181 def _revinfogetter(repo): |
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182 """return a function that return multiple data given a <rev>"i |
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183 |
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184 * p1: revision number of first parent |
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185 * p2: revision number of first parent |
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186 * p1copies: mapping of copies from p1 |
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187 * p2copies: mapping of copies from p2 |
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188 * removed: a list of removed files |
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189 """ |
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190 cl = repo.changelog |
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191 parents = cl.parentrevs |
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192 |
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193 def revinfo(rev): |
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194 p1, p2 = parents(rev) |
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195 ctx = repo[rev] |
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196 p1copies, p2copies = ctx._copies |
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197 removed = ctx.filesremoved() |
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198 return p1, p2, p1copies, p2copies, removed |
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199 |
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200 return revinfo |
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201 |
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202 |
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203 def _changesetforwardcopies(a, b, match): |
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204 if a.rev() in (node.nullrev, b.rev()): |
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205 return {} |
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206 |
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207 repo = a.repo() |
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208 children = {} |
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209 revinfo = _revinfogetter(repo) |
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210 |
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211 cl = repo.changelog |
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212 missingrevs = cl.findmissingrevs(common=[a.rev()], heads=[b.rev()]) |
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213 for r in missingrevs: |
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214 for p in cl.parentrevs(r): |
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215 if p == node.nullrev: |
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216 continue |
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217 if p not in children: |
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218 children[p] = [r] |
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219 else: |
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220 children[p].append(r) |
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221 |
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222 roots = set(children) - set(missingrevs) |
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223 work = list(roots) |
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224 all_copies = {r: {} for r in roots} |
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225 heapq.heapify(work) |
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226 alwaysmatch = match.always() |
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227 while work: |
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228 r = heapq.heappop(work) |
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229 copies = all_copies.pop(r) |
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230 if r == b.rev(): |
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231 return copies |
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232 for i, c in enumerate(children[r]): |
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233 p1, p2, p1copies, p2copies, removed = revinfo(c) |
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234 if r == p1: |
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235 parent = 1 |
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236 childcopies = p1copies |
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237 else: |
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238 assert r == p2 |
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239 parent = 2 |
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240 childcopies = p2copies |
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241 if not alwaysmatch: |
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242 childcopies = { |
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243 dst: src for dst, src in childcopies.items() if match(dst) |
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244 } |
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245 # Copy the dict only if later iterations will also need it |
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246 if i != len(children[r]) - 1: |
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247 newcopies = copies.copy() |
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248 else: |
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249 newcopies = copies |
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250 if childcopies: |
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251 newcopies = _chain(newcopies, childcopies) |
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252 for f in removed: |
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253 if f in newcopies: |
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254 del newcopies[f] |
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255 othercopies = all_copies.get(c) |
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256 if othercopies is None: |
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257 heapq.heappush(work, c) |
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258 all_copies[c] = newcopies |
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259 else: |
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260 # we are the second parent to work on c, we need to merge our |
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261 # work with the other. |
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262 # |
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263 # Unlike when copies are stored in the filelog, we consider |
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264 # it a copy even if the destination already existed on the |
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265 # other branch. It's simply too expensive to check if the |
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266 # file existed in the manifest. |
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267 # |
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268 # In case of conflict, parent 1 take precedence over parent 2. |
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269 # This is an arbitrary choice made anew when implementing |
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270 # changeset based copies. It was made without regards with |
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271 # potential filelog related behavior. |
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272 if parent == 1: |
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273 othercopies.update(newcopies) |
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274 else: |
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275 newcopies.update(othercopies) |
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276 all_copies[c] = newcopies |
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277 assert False |
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278 |
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279 |
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280 def _forwardcopies(a, b, base=None, match=None): |
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281 """find {dst@b: src@a} copy mapping where a is an ancestor of b""" |
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282 |
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283 if base is None: |
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284 base = a |
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285 match = a.repo().narrowmatch(match) |
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286 # check for working copy |
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287 if b.rev() is None: |
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288 cm = _committedforwardcopies(a, b.p1(), base, match) |
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289 # combine copies from dirstate if necessary |
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290 copies = _chain(cm, _dirstatecopies(b._repo, match)) |
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291 else: |
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292 copies = _committedforwardcopies(a, b, base, match) |
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293 return copies |
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294 |
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295 |
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296 def _backwardrenames(a, b, match): |
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297 if a._repo.ui.config(b'experimental', b'copytrace') == b'off': |
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298 return {} |
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299 |
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300 # Even though we're not taking copies into account, 1:n rename situations |
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301 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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302 # arbitrarily pick one of the renames. |
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303 # We don't want to pass in "match" here, since that would filter |
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304 # the destination by it. Since we're reversing the copies, we want |
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305 # to filter the source instead. |
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306 f = _forwardcopies(b, a) |
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307 r = {} |
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308 for k, v in sorted(pycompat.iteritems(f)): |
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309 if match and not match(v): |
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310 continue |
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311 # remove copies |
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312 if v in a: |
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313 continue |
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314 r[v] = k |
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315 return r |
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316 |
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317 |
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318 def pathcopies(x, y, match=None): |
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319 """find {dst@y: src@x} copy mapping for directed compare""" |
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320 repo = x._repo |
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321 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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322 if debug: |
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323 repo.ui.debug( |
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324 b'debug.copies: searching copies from %s to %s\n' % (x, y) |
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325 ) |
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326 if x == y or not x or not y: |
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327 return {} |
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328 a = y.ancestor(x) |
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329 if a == x: |
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330 if debug: |
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331 repo.ui.debug(b'debug.copies: search mode: forward\n') |
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332 if y.rev() is None and x == y.p1(): |
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333 # short-circuit to avoid issues with merge states |
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334 return _dirstatecopies(repo, match) |
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335 copies = _forwardcopies(x, y, match=match) |
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336 elif a == y: |
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337 if debug: |
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338 repo.ui.debug(b'debug.copies: search mode: backward\n') |
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339 copies = _backwardrenames(x, y, match=match) |
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340 else: |
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341 if debug: |
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342 repo.ui.debug(b'debug.copies: search mode: combined\n') |
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343 base = None |
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344 if a.rev() != node.nullrev: |
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345 base = x |
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346 copies = _chain( |
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347 _backwardrenames(x, a, match=match), |
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348 _forwardcopies(a, y, base, match=match), |
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349 ) |
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350 _filter(x, y, copies) |
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351 return copies |
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352 |
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353 |
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354 def mergecopies(repo, c1, c2, base): |
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355 """ |
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356 Finds moves and copies between context c1 and c2 that are relevant for |
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357 merging. 'base' will be used as the merge base. |
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358 |
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359 Copytracing is used in commands like rebase, merge, unshelve, etc to merge |
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360 files that were moved/ copied in one merge parent and modified in another. |
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361 For example: |
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362 |
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363 o ---> 4 another commit |
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364 | |
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365 | o ---> 3 commit that modifies a.txt |
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366 | / |
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367 o / ---> 2 commit that moves a.txt to b.txt |
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368 |/ |
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369 o ---> 1 merge base |
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370 |
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371 If we try to rebase revision 3 on revision 4, since there is no a.txt in |
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372 revision 4, and if user have copytrace disabled, we prints the following |
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373 message: |
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374 |
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375 ```other changed <file> which local deleted``` |
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376 |
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377 Returns five dicts: "copy", "movewithdir", "diverge", "renamedelete" and |
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378 "dirmove". |
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379 |
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380 "copy" is a mapping from destination name -> source name, |
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381 where source is in c1 and destination is in c2 or vice-versa. |
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382 |
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383 "movewithdir" is a mapping from source name -> destination name, |
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384 where the file at source present in one context but not the other |
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385 needs to be moved to destination by the merge process, because the |
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386 other context moved the directory it is in. |
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387 |
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388 "diverge" is a mapping of source name -> list of destination names |
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389 for divergent renames. |
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390 |
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391 "renamedelete" is a mapping of source name -> list of destination |
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392 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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393 |
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394 "dirmove" is a mapping of detected source dir -> destination dir renames. |
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395 This is needed for handling changes to new files previously grafted into |
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396 renamed directories. |
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397 |
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398 This function calls different copytracing algorithms based on config. |
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399 """ |
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400 # avoid silly behavior for update from empty dir |
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401 if not c1 or not c2 or c1 == c2: |
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402 return {}, {}, {}, {}, {} |
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403 |
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404 narrowmatch = c1.repo().narrowmatch() |
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405 |
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406 # avoid silly behavior for parent -> working dir |
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407 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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408 return _dirstatecopies(repo, narrowmatch), {}, {}, {}, {} |
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409 |
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410 copytracing = repo.ui.config(b'experimental', b'copytrace') |
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411 if stringutil.parsebool(copytracing) is False: |
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412 # stringutil.parsebool() returns None when it is unable to parse the |
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413 # value, so we should rely on making sure copytracing is on such cases |
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414 return {}, {}, {}, {}, {} |
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415 |
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416 if usechangesetcentricalgo(repo): |
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417 # The heuristics don't make sense when we need changeset-centric algos |
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418 return _fullcopytracing(repo, c1, c2, base) |
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419 |
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420 # Copy trace disabling is explicitly below the node == p1 logic above |
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421 # because the logic above is required for a simple copy to be kept across a |
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422 # rebase. |
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423 if copytracing == b'heuristics': |
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424 # Do full copytracing if only non-public revisions are involved as |
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425 # that will be fast enough and will also cover the copies which could |
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426 # be missed by heuristics |
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427 if _isfullcopytraceable(repo, c1, base): |
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428 return _fullcopytracing(repo, c1, c2, base) |
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429 return _heuristicscopytracing(repo, c1, c2, base) |
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430 else: |
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431 return _fullcopytracing(repo, c1, c2, base) |
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432 |
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433 |
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434 def _isfullcopytraceable(repo, c1, base): |
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435 """ Checks that if base, source and destination are all no-public branches, |
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436 if yes let's use the full copytrace algorithm for increased capabilities |
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437 since it will be fast enough. |
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438 |
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439 `experimental.copytrace.sourcecommitlimit` can be used to set a limit for |
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440 number of changesets from c1 to base such that if number of changesets are |
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441 more than the limit, full copytracing algorithm won't be used. |
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442 """ |
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443 if c1.rev() is None: |
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444 c1 = c1.p1() |
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445 if c1.mutable() and base.mutable(): |
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446 sourcecommitlimit = repo.ui.configint( |
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447 b'experimental', b'copytrace.sourcecommitlimit' |
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448 ) |
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449 commits = len(repo.revs(b'%d::%d', base.rev(), c1.rev())) |
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450 return commits < sourcecommitlimit |
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451 return False |
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452 |
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453 |
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454 def _checksinglesidecopies( |
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455 src, dsts1, m1, m2, mb, c2, base, copy, renamedelete |
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456 ): |
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457 if src not in m2: |
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458 # deleted on side 2 |
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459 if src not in m1: |
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460 # renamed on side 1, deleted on side 2 |
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461 renamedelete[src] = dsts1 |
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462 elif m2[src] != mb[src]: |
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463 if not _related(c2[src], base[src]): |
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464 return |
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465 # modified on side 2 |
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466 for dst in dsts1: |
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467 if dst not in m2: |
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468 # dst not added on side 2 (handle as regular |
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469 # "both created" case in manifestmerge otherwise) |
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470 copy[dst] = src |
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471 |
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472 |
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473 def _fullcopytracing(repo, c1, c2, base): |
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474 """ The full copytracing algorithm which finds all the new files that were |
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475 added from merge base up to the top commit and for each file it checks if |
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476 this file was copied from another file. |
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477 |
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478 This is pretty slow when a lot of changesets are involved but will track all |
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479 the copies. |
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480 """ |
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481 m1 = c1.manifest() |
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482 m2 = c2.manifest() |
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483 mb = base.manifest() |
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484 |
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485 copies1 = pathcopies(base, c1) |
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486 copies2 = pathcopies(base, c2) |
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487 |
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488 inversecopies1 = {} |
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489 inversecopies2 = {} |
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490 for dst, src in copies1.items(): |
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491 inversecopies1.setdefault(src, []).append(dst) |
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492 for dst, src in copies2.items(): |
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493 inversecopies2.setdefault(src, []).append(dst) |
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494 |
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495 copy = {} |
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496 diverge = {} |
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497 renamedelete = {} |
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498 allsources = set(inversecopies1) | set(inversecopies2) |
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499 for src in allsources: |
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500 dsts1 = inversecopies1.get(src) |
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501 dsts2 = inversecopies2.get(src) |
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502 if dsts1 and dsts2: |
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503 # copied/renamed on both sides |
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504 if src not in m1 and src not in m2: |
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505 # renamed on both sides |
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506 dsts1 = set(dsts1) |
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507 dsts2 = set(dsts2) |
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508 # If there's some overlap in the rename destinations, we |
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509 # consider it not divergent. For example, if side 1 copies 'a' |
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510 # to 'b' and 'c' and deletes 'a', and side 2 copies 'a' to 'c' |
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511 # and 'd' and deletes 'a'. |
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512 if dsts1 & dsts2: |
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513 for dst in dsts1 & dsts2: |
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514 copy[dst] = src |
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515 else: |
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516 diverge[src] = sorted(dsts1 | dsts2) |
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517 elif src in m1 and src in m2: |
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518 # copied on both sides |
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519 dsts1 = set(dsts1) |
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520 dsts2 = set(dsts2) |
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521 for dst in dsts1 & dsts2: |
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522 copy[dst] = src |
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523 # TODO: Handle cases where it was renamed on one side and copied |
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524 # on the other side |
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525 elif dsts1: |
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526 # copied/renamed only on side 1 |
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527 _checksinglesidecopies( |
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528 src, dsts1, m1, m2, mb, c2, base, copy, renamedelete |
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529 ) |
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530 elif dsts2: |
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531 # copied/renamed only on side 2 |
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532 _checksinglesidecopies( |
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533 src, dsts2, m2, m1, mb, c1, base, copy, renamedelete |
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534 ) |
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535 |
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536 renamedeleteset = set() |
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537 divergeset = set() |
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538 for dsts in diverge.values(): |
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539 divergeset.update(dsts) |
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540 for dsts in renamedelete.values(): |
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541 renamedeleteset.update(dsts) |
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542 |
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543 # find interesting file sets from manifests |
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544 addedinm1 = m1.filesnotin(mb, repo.narrowmatch()) |
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545 addedinm2 = m2.filesnotin(mb, repo.narrowmatch()) |
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546 u1 = sorted(addedinm1 - addedinm2) |
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547 u2 = sorted(addedinm2 - addedinm1) |
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548 |
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549 header = b" unmatched files in %s" |
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550 if u1: |
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551 repo.ui.debug(b"%s:\n %s\n" % (header % b'local', b"\n ".join(u1))) |
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552 if u2: |
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553 repo.ui.debug(b"%s:\n %s\n" % (header % b'other', b"\n ".join(u2))) |
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554 |
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555 fullcopy = copies1.copy() |
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556 fullcopy.update(copies2) |
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557 if not fullcopy: |
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558 return copy, {}, diverge, renamedelete, {} |
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559 |
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560 if repo.ui.debugflag: |
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561 repo.ui.debug( |
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562 b" all copies found (* = to merge, ! = divergent, " |
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563 b"% = renamed and deleted):\n" |
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564 ) |
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565 for f in sorted(fullcopy): |
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566 note = b"" |
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567 if f in copy: |
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568 note += b"*" |
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569 if f in divergeset: |
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570 note += b"!" |
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571 if f in renamedeleteset: |
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572 note += b"%" |
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573 repo.ui.debug( |
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574 b" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, note) |
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575 ) |
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576 del divergeset |
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577 |
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578 repo.ui.debug(b" checking for directory renames\n") |
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579 |
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580 # generate a directory move map |
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581 d1, d2 = c1.dirs(), c2.dirs() |
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582 invalid = set() |
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583 dirmove = {} |
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584 |
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585 # examine each file copy for a potential directory move, which is |
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586 # when all the files in a directory are moved to a new directory |
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587 for dst, src in pycompat.iteritems(fullcopy): |
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588 dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst) |
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589 if dsrc in invalid: |
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590 # already seen to be uninteresting |
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591 continue |
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592 elif dsrc in d1 and ddst in d1: |
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593 # directory wasn't entirely moved locally |
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594 invalid.add(dsrc) |
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595 elif dsrc in d2 and ddst in d2: |
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596 # directory wasn't entirely moved remotely |
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597 invalid.add(dsrc) |
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598 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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599 # files from the same directory moved to two different places |
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600 invalid.add(dsrc) |
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601 else: |
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602 # looks good so far |
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603 dirmove[dsrc] = ddst |
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604 |
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605 for i in invalid: |
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606 if i in dirmove: |
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607 del dirmove[i] |
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608 del d1, d2, invalid |
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609 |
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610 if not dirmove: |
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611 return copy, {}, diverge, renamedelete, {} |
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612 |
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613 dirmove = {k + b"/": v + b"/" for k, v in pycompat.iteritems(dirmove)} |
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614 |
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615 for d in dirmove: |
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616 repo.ui.debug( |
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617 b" discovered dir src: '%s' -> dst: '%s'\n" % (d, dirmove[d]) |
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618 ) |
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619 |
30183
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620 movewithdir = {} |
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621 # check unaccounted nonoverlapping files against directory moves |
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622 for f in u1 + u2: |
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623 if f not in fullcopy: |
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624 for d in dirmove: |
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625 if f.startswith(d): |
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626 # new file added in a directory that was moved, move it |
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627 df = dirmove[d] + f[len(d) :] |
6426
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628 if df not in copy: |
18134
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629 movewithdir[f] = df |
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630 repo.ui.debug( |
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631 b" pending file src: '%s' -> dst: '%s'\n" |
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632 % (f, df) |
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633 ) |
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634 break |
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|
635 |
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|
636 return copy, movewithdir, diverge, renamedelete, dirmove |
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637 |
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638 |
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639 def _heuristicscopytracing(repo, c1, c2, base): |
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640 """ Fast copytracing using filename heuristics |
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641 |
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642 Assumes that moves or renames are of following two types: |
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643 |
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644 1) Inside a directory only (same directory name but different filenames) |
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645 2) Move from one directory to another |
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646 (same filenames but different directory names) |
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647 |
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648 Works only when there are no merge commits in the "source branch". |
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649 Source branch is commits from base up to c2 not including base. |
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650 |
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651 If merge is involved it fallbacks to _fullcopytracing(). |
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652 |
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653 Can be used by setting the following config: |
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654 |
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655 [experimental] |
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656 copytrace = heuristics |
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657 |
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658 In some cases the copy/move candidates found by heuristics can be very large |
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659 in number and that will make the algorithm slow. The number of possible |
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660 candidates to check can be limited by using the config |
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661 `experimental.copytrace.movecandidateslimit` which defaults to 100. |
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662 """ |
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663 |
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664 if c1.rev() is None: |
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665 c1 = c1.p1() |
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666 if c2.rev() is None: |
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667 c2 = c2.p1() |
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668 |
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669 copies = {} |
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670 |
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671 changedfiles = set() |
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672 m1 = c1.manifest() |
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673 if not repo.revs(b'%d::%d', base.rev(), c2.rev()): |
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674 # If base is not in c2 branch, we switch to fullcopytracing |
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675 repo.ui.debug( |
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676 b"switching to full copytracing as base is not " |
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677 b"an ancestor of c2\n" |
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678 ) |
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679 return _fullcopytracing(repo, c1, c2, base) |
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680 |
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681 ctx = c2 |
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682 while ctx != base: |
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683 if len(ctx.parents()) == 2: |
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684 # To keep things simple let's not handle merges |
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685 repo.ui.debug(b"switching to full copytracing because of merges\n") |
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686 return _fullcopytracing(repo, c1, c2, base) |
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687 changedfiles.update(ctx.files()) |
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688 ctx = ctx.p1() |
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689 |
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690 cp = _forwardcopies(base, c2) |
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691 for dst, src in pycompat.iteritems(cp): |
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692 if src in m1: |
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693 copies[dst] = src |
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694 |
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695 # file is missing if it isn't present in the destination, but is present in |
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696 # the base and present in the source. |
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697 # Presence in the base is important to exclude added files, presence in the |
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698 # source is important to exclude removed files. |
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699 filt = lambda f: f not in m1 and f in base and f in c2 |
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700 missingfiles = [f for f in changedfiles if filt(f)] |
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701 |
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702 if missingfiles: |
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703 basenametofilename = collections.defaultdict(list) |
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704 dirnametofilename = collections.defaultdict(list) |
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705 |
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706 for f in m1.filesnotin(base.manifest()): |
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707 basename = os.path.basename(f) |
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708 dirname = os.path.dirname(f) |
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709 basenametofilename[basename].append(f) |
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710 dirnametofilename[dirname].append(f) |
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711 |
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712 for f in missingfiles: |
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713 basename = os.path.basename(f) |
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714 dirname = os.path.dirname(f) |
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715 samebasename = basenametofilename[basename] |
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716 samedirname = dirnametofilename[dirname] |
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717 movecandidates = samebasename + samedirname |
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718 # f is guaranteed to be present in c2, that's why |
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719 # c2.filectx(f) won't fail |
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720 f2 = c2.filectx(f) |
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721 # we can have a lot of candidates which can slow down the heuristics |
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722 # config value to limit the number of candidates moves to check |
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723 maxcandidates = repo.ui.configint( |
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724 b'experimental', b'copytrace.movecandidateslimit' |
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725 ) |
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726 |
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727 if len(movecandidates) > maxcandidates: |
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728 repo.ui.status( |
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729 _( |
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730 b"skipping copytracing for '%s', more " |
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731 b"candidates than the limit: %d\n" |
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732 ) |
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733 % (f, len(movecandidates)) |
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734 ) |
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735 continue |
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736 |
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737 for candidate in movecandidates: |
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738 f1 = c1.filectx(candidate) |
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739 if _related(f1, f2): |
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740 # if there are a few related copies then we'll merge |
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741 # changes into all of them. This matches the behaviour |
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742 # of upstream copytracing |
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743 copies[candidate] = f |
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744 |
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745 return copies, {}, {}, {}, {} |
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746 |
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747 |
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748 def _related(f1, f2): |
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749 """return True if f1 and f2 filectx have a common ancestor |
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750 |
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751 Walk back to common ancestor to see if the two files originate |
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752 from the same file. Since workingfilectx's rev() is None it messes |
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753 up the integer comparison logic, hence the pre-step check for |
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754 None (f1 and f2 can only be workingfilectx's initially). |
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755 """ |
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756 |
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757 if f1 == f2: |
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758 return True # a match |
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759 |
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760 g1, g2 = f1.ancestors(), f2.ancestors() |
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761 try: |
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762 f1r, f2r = f1.linkrev(), f2.linkrev() |
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763 |
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764 if f1r is None: |
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765 f1 = next(g1) |
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766 if f2r is None: |
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767 f2 = next(g2) |
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768 |
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769 while True: |
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770 f1r, f2r = f1.linkrev(), f2.linkrev() |
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771 if f1r > f2r: |
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772 f1 = next(g1) |
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773 elif f2r > f1r: |
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774 f2 = next(g2) |
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775 else: # f1 and f2 point to files in the same linkrev |
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776 return f1 == f2 # true if they point to the same file |
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777 except StopIteration: |
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778 return False |
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779 |
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780 |
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781 def duplicatecopies(repo, wctx, rev, fromrev, skiprev=None): |
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782 """reproduce copies from fromrev to rev in the dirstate |
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783 |
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784 If skiprev is specified, it's a revision that should be used to |
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785 filter copy records. Any copies that occur between fromrev and |
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786 skiprev will not be duplicated, even if they appear in the set of |
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787 copies between fromrev and rev. |
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788 """ |
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789 exclude = {} |
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790 ctraceconfig = repo.ui.config(b'experimental', b'copytrace') |
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791 bctrace = stringutil.parsebool(ctraceconfig) |
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792 if skiprev is not None and ( |
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793 ctraceconfig == b'heuristics' or bctrace or bctrace is None |
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794 ): |
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795 # copytrace='off' skips this line, but not the entire function because |
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796 # the line below is O(size of the repo) during a rebase, while the rest |
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797 # of the function is much faster (and is required for carrying copy |
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798 # metadata across the rebase anyway). |
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799 exclude = pathcopies(repo[fromrev], repo[skiprev]) |
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800 for dst, src in pycompat.iteritems(pathcopies(repo[fromrev], repo[rev])): |
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801 if dst in exclude: |
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802 continue |
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803 if dst in wctx: |
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804 wctx[dst].markcopied(src) |
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805 |
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806 |
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807 def computechangesetfilesadded(ctx): |
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808 """return the list of files added in a changeset |
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809 """ |
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810 added = [] |
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811 for f in ctx.files(): |
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812 if not any(f in p for p in ctx.parents()): |
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813 added.append(f) |
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814 return added |
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815 |
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816 |
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817 def computechangesetfilesremoved(ctx): |
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818 """return the list of files removed in a changeset |
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819 """ |
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820 removed = [] |
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821 for f in ctx.files(): |
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822 if f not in ctx: |
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823 removed.append(f) |
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824 return removed |
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825 |
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826 |
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827 def computechangesetcopies(ctx): |
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828 """return the copies data for a changeset |
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829 |
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830 The copies data are returned as a pair of dictionnary (p1copies, p2copies). |
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831 |
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832 Each dictionnary are in the form: `{newname: oldname}` |
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833 """ |
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834 p1copies = {} |
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835 p2copies = {} |
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836 p1 = ctx.p1() |
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837 p2 = ctx.p2() |
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838 narrowmatch = ctx._repo.narrowmatch() |
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839 for dst in ctx.files(): |
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840 if not narrowmatch(dst) or dst not in ctx: |
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841 continue |
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842 copied = ctx[dst].renamed() |
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843 if not copied: |
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844 continue |
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845 src, srcnode = copied |
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846 if src in p1 and p1[src].filenode() == srcnode: |
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847 p1copies[dst] = src |
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848 elif src in p2 and p2[src].filenode() == srcnode: |
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849 p2copies[dst] = src |
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850 return p1copies, p2copies |
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851 |
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852 |
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853 def encodecopies(files, copies): |
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854 items = [] |
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855 for i, dst in enumerate(files): |
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856 if dst in copies: |
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857 items.append(b'%d\0%s' % (i, copies[dst])) |
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858 if len(items) != len(copies): |
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859 raise error.ProgrammingError( |
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860 b'some copy targets missing from file list' |
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861 ) |
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862 return b"\n".join(items) |
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863 |
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864 |
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865 def decodecopies(files, data): |
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866 try: |
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867 copies = {} |
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868 if not data: |
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869 return copies |
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870 for l in data.split(b'\n'): |
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871 strindex, src = l.split(b'\0') |
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872 i = int(strindex) |
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873 dst = files[i] |
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874 copies[dst] = src |
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875 return copies |
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876 except (ValueError, IndexError): |
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877 # Perhaps someone had chosen the same key name (e.g. "p1copies") and |
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878 # used different syntax for the value. |
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879 return None |
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880 |
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881 |
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882 def encodefileindices(files, subset): |
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883 subset = set(subset) |
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884 indices = [] |
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885 for i, f in enumerate(files): |
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886 if f in subset: |
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887 indices.append(b'%d' % i) |
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888 return b'\n'.join(indices) |
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889 |
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890 |
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891 def decodefileindices(files, data): |
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892 try: |
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893 subset = [] |
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894 if not data: |
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895 return subset |
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896 for strindex in data.split(b'\n'): |
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897 i = int(strindex) |
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898 if i < 0 or i >= len(files): |
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899 return None |
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900 subset.append(files[i]) |
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901 return subset |
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902 except (ValueError, IndexError): |
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903 # Perhaps someone had chosen the same key name (e.g. "added") and |
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904 # used different syntax for the value. |
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|
905 return None |
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906 |
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907 |
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|
908 def _getsidedata(srcrepo, rev): |
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909 ctx = srcrepo[rev] |
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910 filescopies = computechangesetcopies(ctx) |
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911 filesadded = computechangesetfilesadded(ctx) |
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912 filesremoved = computechangesetfilesremoved(ctx) |
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913 sidedata = {} |
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914 if any([filescopies, filesadded, filesremoved]): |
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915 sortedfiles = sorted(ctx.files()) |
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916 p1copies, p2copies = filescopies |
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|
917 p1copies = encodecopies(sortedfiles, p1copies) |
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918 p2copies = encodecopies(sortedfiles, p2copies) |
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|
919 filesadded = encodefileindices(sortedfiles, filesadded) |
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920 filesremoved = encodefileindices(sortedfiles, filesremoved) |
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|
921 if p1copies: |
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|
922 sidedata[sidedatamod.SD_P1COPIES] = p1copies |
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|
923 if p2copies: |
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924 sidedata[sidedatamod.SD_P2COPIES] = p2copies |
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925 if filesadded: |
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926 sidedata[sidedatamod.SD_FILESADDED] = filesadded |
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927 if filesremoved: |
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|
928 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved |
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929 return sidedata |
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930 |
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931 |
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932 def getsidedataadder(srcrepo, destrepo): |
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933 def sidedatacompanion(revlog, rev): |
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934 sidedata = {} |
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|
935 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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936 sidedata = _getsidedata(srcrepo, rev) |
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|
937 return False, (), sidedata |
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938 |
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939 return sidedatacompanion |
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940 |
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941 |
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942 def getsidedataremover(srcrepo, destrepo): |
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943 def sidedatacompanion(revlog, rev): |
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944 f = () |
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945 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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|
946 if revlog.flags(rev) & REVIDX_SIDEDATA: |
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|
947 f = ( |
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948 sidedatamod.SD_P1COPIES, |
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|
949 sidedatamod.SD_P2COPIES, |
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950 sidedatamod.SD_FILESADDED, |
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|
951 sidedatamod.SD_FILESREMOVED, |
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|
952 ) |
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953 return False, f, {} |
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|
954 |
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|
955 return sidedatacompanion |