Mercurial > hg
annotate mercurial/copies.py @ 45670:a8fb29b05f92
salvaged: properly deal with salvaged file during copy tracing
When salvaged files are encountered, the removal have been reverted and we
should keep the rename information from the other side.
The conditional was starting to be quite hairy, so we spell it out in multiple
elif case for readability.
This fixes the associated test cases introduced a while back. The changeset centric copy tracing is now (known) bug free.
Differential Revision: https://phab.mercurial-scm.org/D9130
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 16 Sep 2020 21:00:02 +0200 |
parents | 2693659c2b34 |
children | f877b3628015 |
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 os |
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12 |
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13 from .i18n import _ |
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14 |
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15 |
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16 from . import ( |
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17 match as matchmod, |
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18 node, |
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19 pathutil, |
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20 pycompat, |
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21 util, |
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22 ) |
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23 |
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24 |
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25 from .utils import stringutil |
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26 |
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27 |
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28 def _filter(src, dst, t): |
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29 """filters out invalid copies after chaining""" |
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30 |
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31 # When _chain()'ing copies in 'a' (from 'src' via some other commit 'mid') |
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32 # with copies in 'b' (from 'mid' to 'dst'), we can get the different cases |
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33 # in the following table (not including trivial cases). For example, case 2 |
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34 # is where a file existed in 'src' and remained under that name in 'mid' and |
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35 # then was renamed between 'mid' and 'dst'. |
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36 # |
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37 # case src mid dst result |
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38 # 1 x y - - |
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39 # 2 x y y x->y |
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40 # 3 x y x - |
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41 # 4 x y z x->z |
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42 # 5 - x y - |
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43 # 6 x x y x->y |
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44 # |
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45 # _chain() takes care of chaining the copies in 'a' and 'b', but it |
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46 # cannot tell the difference between cases 1 and 2, between 3 and 4, or |
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47 # between 5 and 6, so it includes all cases in its result. |
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48 # Cases 1, 3, and 5 are then removed by _filter(). |
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49 |
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50 for k, v in list(t.items()): |
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51 # remove copies from files that didn't exist |
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52 if v not in src: |
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53 del t[k] |
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54 # remove criss-crossed copies |
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55 elif k in src and v in dst: |
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56 del t[k] |
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57 # remove copies to files that were then removed |
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58 elif k not in dst: |
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59 del t[k] |
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60 |
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61 |
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62 def _chain(prefix, suffix): |
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63 """chain two sets of copies 'prefix' and 'suffix'""" |
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64 result = prefix.copy() |
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65 for key, value in pycompat.iteritems(suffix): |
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66 result[key] = prefix.get(value, value) |
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67 return result |
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68 |
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69 |
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70 def _tracefile(fctx, am, basemf): |
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71 """return file context that is the ancestor of fctx present in ancestor |
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72 manifest am |
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73 |
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74 Note: we used to try and stop after a given limit, however checking if that |
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75 limit is reached turned out to be very expensive. we are better off |
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76 disabling that feature.""" |
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77 |
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78 for f in fctx.ancestors(): |
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79 path = f.path() |
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80 if am.get(path, None) == f.filenode(): |
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81 return path |
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82 if basemf and basemf.get(path, None) == f.filenode(): |
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83 return path |
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84 |
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85 |
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86 def _dirstatecopies(repo, match=None): |
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87 ds = repo.dirstate |
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88 c = ds.copies().copy() |
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89 for k in list(c): |
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90 if ds[k] not in b'anm' or (match and not match(k)): |
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91 del c[k] |
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92 return c |
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93 |
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94 |
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95 def _computeforwardmissing(a, b, match=None): |
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96 """Computes which files are in b but not a. |
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97 This is its own function so extensions can easily wrap this call to see what |
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98 files _forwardcopies is about to process. |
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99 """ |
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100 ma = a.manifest() |
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101 mb = b.manifest() |
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102 return mb.filesnotin(ma, match=match) |
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103 |
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104 |
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105 def usechangesetcentricalgo(repo): |
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106 """Checks if we should use changeset-centric copy algorithms""" |
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107 if repo.filecopiesmode == b'changeset-sidedata': |
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108 return True |
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109 readfrom = repo.ui.config(b'experimental', b'copies.read-from') |
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110 changesetsource = (b'changeset-only', b'compatibility') |
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111 return readfrom in changesetsource |
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112 |
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113 |
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114 def _committedforwardcopies(a, b, base, match): |
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115 """Like _forwardcopies(), but b.rev() cannot be None (working copy)""" |
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116 # files might have to be traced back to the fctx parent of the last |
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117 # one-side-only changeset, but not further back than that |
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118 repo = a._repo |
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119 |
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120 if usechangesetcentricalgo(repo): |
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121 return _changesetforwardcopies(a, b, match) |
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122 |
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123 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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124 dbg = repo.ui.debug |
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125 if debug: |
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126 dbg(b'debug.copies: looking into rename from %s to %s\n' % (a, b)) |
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127 am = a.manifest() |
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128 basemf = None if base is None else base.manifest() |
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129 |
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130 # find where new files came from |
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131 # we currently don't try to find where old files went, too expensive |
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132 # this means we can miss a case like 'hg rm b; hg cp a b' |
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133 cm = {} |
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134 |
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135 # Computing the forward missing is quite expensive on large manifests, since |
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136 # it compares the entire manifests. We can optimize it in the common use |
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137 # case of computing what copies are in a commit versus its parent (like |
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138 # during a rebase or histedit). Note, we exclude merge commits from this |
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139 # optimization, since the ctx.files() for a merge commit is not correct for |
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140 # this comparison. |
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141 forwardmissingmatch = match |
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142 if b.p1() == a and b.p2().node() == node.nullid: |
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143 filesmatcher = matchmod.exact(b.files()) |
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144 forwardmissingmatch = matchmod.intersectmatchers(match, filesmatcher) |
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145 missing = _computeforwardmissing(a, b, match=forwardmissingmatch) |
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146 |
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147 ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) |
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148 |
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149 if debug: |
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150 dbg(b'debug.copies: missing files to search: %d\n' % len(missing)) |
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151 |
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152 for f in sorted(missing): |
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153 if debug: |
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154 dbg(b'debug.copies: tracing file: %s\n' % f) |
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155 fctx = b[f] |
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156 fctx._ancestrycontext = ancestrycontext |
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157 |
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158 if debug: |
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159 start = util.timer() |
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160 opath = _tracefile(fctx, am, basemf) |
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161 if opath: |
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162 if debug: |
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163 dbg(b'debug.copies: rename of: %s\n' % opath) |
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164 cm[f] = opath |
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165 if debug: |
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166 dbg( |
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167 b'debug.copies: time: %f seconds\n' |
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168 % (util.timer() - start) |
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169 ) |
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170 return cm |
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171 |
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172 |
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173 def _revinfo_getter(repo): |
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174 """returns a function that returns the following data given a <rev>" |
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175 |
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176 * p1: revision number of first parent |
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177 * p2: revision number of first parent |
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178 * changes: a ChangingFiles object |
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179 """ |
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180 cl = repo.changelog |
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181 parents = cl.parentrevs |
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182 |
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183 changelogrevision = cl.changelogrevision |
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184 |
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185 # A small cache to avoid doing the work twice for merges |
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186 # |
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187 # In the vast majority of cases, if we ask information for a revision |
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188 # about 1 parent, we'll later ask it for the other. So it make sense to |
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189 # keep the information around when reaching the first parent of a merge |
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190 # and dropping it after it was provided for the second parents. |
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191 # |
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192 # It exists cases were only one parent of the merge will be walked. It |
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193 # happens when the "destination" the copy tracing is descendant from a |
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194 # new root, not common with the "source". In that case, we will only walk |
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195 # through merge parents that are descendant of changesets common |
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196 # between "source" and "destination". |
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197 # |
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198 # With the current case implementation if such changesets have a copy |
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199 # information, we'll keep them in memory until the end of |
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200 # _changesetforwardcopies. We don't expect the case to be frequent |
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201 # enough to matters. |
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202 # |
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203 # In addition, it would be possible to reach pathological case, were |
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204 # many first parent are met before any second parent is reached. In |
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205 # that case the cache could grow. If this even become an issue one can |
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206 # safely introduce a maximum cache size. This would trade extra CPU/IO |
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207 # time to save memory. |
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208 merge_caches = {} |
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209 |
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210 def revinfo(rev): |
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211 p1, p2 = parents(rev) |
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212 value = None |
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213 e = merge_caches.pop(rev, None) |
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214 if e is not None: |
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215 return e |
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216 value = (p1, p2, changelogrevision(rev).changes) |
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217 if p1 != node.nullrev and p2 != node.nullrev: |
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218 # XXX some case we over cache, IGNORE |
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219 merge_caches[rev] = value |
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220 return value |
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221 |
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222 return revinfo |
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223 |
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224 |
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225 def _changesetforwardcopies(a, b, match): |
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226 if a.rev() in (node.nullrev, b.rev()): |
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227 return {} |
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228 |
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229 repo = a.repo().unfiltered() |
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230 children = {} |
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231 |
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232 cl = repo.changelog |
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233 isancestor = cl.isancestorrev # XXX we should had chaching to this. |
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234 missingrevs = cl.findmissingrevs(common=[a.rev()], heads=[b.rev()]) |
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235 mrset = set(missingrevs) |
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236 roots = set() |
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237 for r in missingrevs: |
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238 for p in cl.parentrevs(r): |
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239 if p == node.nullrev: |
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240 continue |
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241 if p not in children: |
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242 children[p] = [r] |
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243 else: |
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244 children[p].append(r) |
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245 if p not in mrset: |
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246 roots.add(p) |
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247 if not roots: |
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248 # no common revision to track copies from |
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249 return {} |
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250 min_root = min(roots) |
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251 |
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252 from_head = set( |
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253 cl.reachableroots(min_root, [b.rev()], list(roots), includepath=True) |
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254 ) |
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255 |
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256 iterrevs = set(from_head) |
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257 iterrevs &= mrset |
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258 iterrevs.update(roots) |
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259 iterrevs.remove(b.rev()) |
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260 revs = sorted(iterrevs) |
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261 |
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262 if repo.filecopiesmode == b'changeset-sidedata': |
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263 revinfo = _revinfo_getter(repo) |
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264 return _combine_changeset_copies( |
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265 revs, children, b.rev(), revinfo, match, isancestor |
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266 ) |
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267 else: |
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268 revinfo = _revinfo_getter_extra(repo) |
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269 return _combine_changeset_copies_extra( |
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270 revs, children, b.rev(), revinfo, match, isancestor |
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271 ) |
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272 |
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273 |
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274 def _combine_changeset_copies( |
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275 revs, children, targetrev, revinfo, match, isancestor |
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276 ): |
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277 """combine the copies information for each item of iterrevs |
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278 |
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279 revs: sorted iterable of revision to visit |
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280 children: a {parent: [children]} mapping. |
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281 targetrev: the final copies destination revision (not in iterrevs) |
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282 revinfo(rev): a function that return (p1, p2, p1copies, p2copies, removed) |
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283 match: a matcher |
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284 |
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285 It returns the aggregated copies information for `targetrev`. |
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286 """ |
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287 all_copies = {} |
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288 alwaysmatch = match.always() |
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289 for r in revs: |
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290 copies = all_copies.pop(r, None) |
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291 if copies is None: |
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292 # this is a root |
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293 copies = {} |
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294 for i, c in enumerate(children[r]): |
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295 p1, p2, changes = revinfo(c) |
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296 if r == p1: |
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297 parent = 1 |
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298 childcopies = changes.copied_from_p1 |
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299 else: |
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300 assert r == p2 |
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301 parent = 2 |
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302 childcopies = changes.copied_from_p2 |
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303 if not alwaysmatch: |
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304 childcopies = { |
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305 dst: src for dst, src in childcopies.items() if match(dst) |
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306 } |
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307 newcopies = copies |
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308 if childcopies: |
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309 newcopies = copies.copy() |
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310 for dest, source in pycompat.iteritems(childcopies): |
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311 prev = copies.get(source) |
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312 if prev is not None and prev[1] is not None: |
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313 source = prev[1] |
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314 newcopies[dest] = (c, source) |
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315 assert newcopies is not copies |
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316 for f in changes.removed: |
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317 if f in newcopies: |
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318 if newcopies is copies: |
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319 # copy on write to avoid affecting potential other |
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320 # branches. when there are no other branches, this |
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321 # could be avoided. |
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322 newcopies = copies.copy() |
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323 newcopies[f] = (c, None) |
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324 othercopies = all_copies.get(c) |
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325 if othercopies is None: |
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326 all_copies[c] = newcopies |
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327 else: |
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328 # we are the second parent to work on c, we need to merge our |
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329 # work with the other. |
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330 # |
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331 # In case of conflict, parent 1 take precedence over parent 2. |
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332 # This is an arbitrary choice made anew when implementing |
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333 # changeset based copies. It was made without regards with |
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334 # potential filelog related behavior. |
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335 if parent == 1: |
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336 _merge_copies_dict( |
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337 othercopies, newcopies, isancestor, changes |
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338 ) |
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339 else: |
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340 _merge_copies_dict( |
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341 newcopies, othercopies, isancestor, changes |
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342 ) |
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343 all_copies[c] = newcopies |
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344 |
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345 final_copies = {} |
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346 for dest, (tt, source) in all_copies[targetrev].items(): |
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347 if source is not None: |
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348 final_copies[dest] = source |
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349 return final_copies |
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350 |
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351 |
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352 def _merge_copies_dict(minor, major, isancestor, changes): |
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353 """merge two copies-mapping together, minor and major |
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354 |
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355 In case of conflict, value from "major" will be picked. |
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356 |
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357 - `isancestors(low_rev, high_rev)`: callable return True if `low_rev` is an |
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358 ancestors of `high_rev`, |
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359 |
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360 - `ismerged(path)`: callable return True if `path` have been merged in the |
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361 current revision, |
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362 """ |
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363 for dest, value in major.items(): |
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364 other = minor.get(dest) |
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365 if other is None: |
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366 minor[dest] = value |
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367 else: |
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368 new_tt = value[0] |
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369 other_tt = other[0] |
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370 if value[1] == other[1]: |
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371 continue |
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372 # content from "major" wins, unless it is older |
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373 # than the branch point or there is a merge |
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374 if new_tt == other_tt: |
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375 minor[dest] = value |
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376 elif value[1] is None and dest in changes.salvaged: |
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377 pass |
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378 elif other[1] is None and dest in changes.salvaged: |
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379 minor[dest] = value |
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380 elif not isancestor(new_tt, other_tt): |
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381 minor[dest] = value |
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382 elif dest in changes.merged: |
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383 minor[dest] = value |
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384 |
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385 |
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386 def _revinfo_getter_extra(repo): |
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387 """return a function that return multiple data given a <rev>"i |
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388 |
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389 * p1: revision number of first parent |
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390 * p2: revision number of first parent |
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391 * p1copies: mapping of copies from p1 |
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392 * p2copies: mapping of copies from p2 |
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393 * removed: a list of removed files |
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394 * ismerged: a callback to know if file was merged in that revision |
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395 """ |
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396 cl = repo.changelog |
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397 parents = cl.parentrevs |
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398 |
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399 def get_ismerged(rev): |
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400 ctx = repo[rev] |
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401 |
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402 def ismerged(path): |
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403 if path not in ctx.files(): |
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404 return False |
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405 fctx = ctx[path] |
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406 parents = fctx._filelog.parents(fctx._filenode) |
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407 nb_parents = 0 |
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408 for n in parents: |
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409 if n != node.nullid: |
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410 nb_parents += 1 |
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411 return nb_parents >= 2 |
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412 |
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413 return ismerged |
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414 |
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415 def revinfo(rev): |
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416 p1, p2 = parents(rev) |
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417 ctx = repo[rev] |
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418 p1copies, p2copies = ctx._copies |
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419 removed = ctx.filesremoved() |
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420 return p1, p2, p1copies, p2copies, removed, get_ismerged(rev) |
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421 |
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422 return revinfo |
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423 |
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424 |
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425 def _combine_changeset_copies_extra( |
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426 revs, children, targetrev, revinfo, match, isancestor |
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427 ): |
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428 """version of `_combine_changeset_copies` that works with the Google |
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429 specific "extra" based storage for copy information""" |
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430 all_copies = {} |
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431 alwaysmatch = match.always() |
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432 for r in revs: |
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433 copies = all_copies.pop(r, None) |
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434 if copies is None: |
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435 # this is a root |
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436 copies = {} |
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437 for i, c in enumerate(children[r]): |
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438 p1, p2, p1copies, p2copies, removed, ismerged = revinfo(c) |
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439 if r == p1: |
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440 parent = 1 |
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441 childcopies = p1copies |
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442 else: |
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443 assert r == p2 |
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444 parent = 2 |
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445 childcopies = p2copies |
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446 if not alwaysmatch: |
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447 childcopies = { |
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448 dst: src for dst, src in childcopies.items() if match(dst) |
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449 } |
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450 newcopies = copies |
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451 if childcopies: |
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452 newcopies = copies.copy() |
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453 for dest, source in pycompat.iteritems(childcopies): |
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454 prev = copies.get(source) |
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455 if prev is not None and prev[1] is not None: |
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456 source = prev[1] |
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457 newcopies[dest] = (c, source) |
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458 assert newcopies is not copies |
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459 for f in removed: |
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460 if f in newcopies: |
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461 if newcopies is copies: |
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462 # copy on write to avoid affecting potential other |
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463 # branches. when there are no other branches, this |
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464 # could be avoided. |
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465 newcopies = copies.copy() |
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466 newcopies[f] = (c, None) |
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467 othercopies = all_copies.get(c) |
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468 if othercopies is None: |
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469 all_copies[c] = newcopies |
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470 else: |
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471 # we are the second parent to work on c, we need to merge our |
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472 # work with the other. |
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473 # |
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474 # In case of conflict, parent 1 take precedence over parent 2. |
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475 # This is an arbitrary choice made anew when implementing |
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476 # changeset based copies. It was made without regards with |
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477 # potential filelog related behavior. |
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478 if parent == 1: |
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479 _merge_copies_dict_extra( |
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480 othercopies, newcopies, isancestor, ismerged |
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481 ) |
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482 else: |
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483 _merge_copies_dict_extra( |
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484 newcopies, othercopies, isancestor, ismerged |
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485 ) |
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486 all_copies[c] = newcopies |
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487 |
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488 final_copies = {} |
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489 for dest, (tt, source) in all_copies[targetrev].items(): |
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490 if source is not None: |
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491 final_copies[dest] = source |
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492 return final_copies |
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493 |
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494 |
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495 def _merge_copies_dict_extra(minor, major, isancestor, ismerged): |
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496 """version of `_merge_copies_dict` that works with the Google |
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497 specific "extra" based storage for copy information""" |
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498 for dest, value in major.items(): |
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499 other = minor.get(dest) |
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500 if other is None: |
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501 minor[dest] = value |
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502 else: |
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503 new_tt = value[0] |
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504 other_tt = other[0] |
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505 if value[1] == other[1]: |
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506 continue |
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507 # content from "major" wins, unless it is older |
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508 # than the branch point or there is a merge |
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509 if ( |
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510 new_tt == other_tt |
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511 or not isancestor(new_tt, other_tt) |
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512 or ismerged(dest) |
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513 ): |
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514 minor[dest] = value |
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515 |
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516 |
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517 def _forwardcopies(a, b, base=None, match=None): |
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518 """find {dst@b: src@a} copy mapping where a is an ancestor of b""" |
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519 |
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520 if base is None: |
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521 base = a |
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522 match = a.repo().narrowmatch(match) |
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523 # check for working copy |
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524 if b.rev() is None: |
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525 cm = _committedforwardcopies(a, b.p1(), base, match) |
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526 # combine copies from dirstate if necessary |
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527 copies = _chain(cm, _dirstatecopies(b._repo, match)) |
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528 else: |
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529 copies = _committedforwardcopies(a, b, base, match) |
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530 return copies |
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531 |
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532 |
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533 def _backwardrenames(a, b, match): |
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534 if a._repo.ui.config(b'experimental', b'copytrace') == b'off': |
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535 return {} |
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536 |
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537 # Even though we're not taking copies into account, 1:n rename situations |
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538 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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539 # arbitrarily pick one of the renames. |
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540 # We don't want to pass in "match" here, since that would filter |
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541 # the destination by it. Since we're reversing the copies, we want |
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542 # to filter the source instead. |
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543 f = _forwardcopies(b, a) |
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544 r = {} |
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545 for k, v in sorted(pycompat.iteritems(f)): |
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546 if match and not match(v): |
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547 continue |
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548 # remove copies |
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549 if v in a: |
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550 continue |
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551 r[v] = k |
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552 return r |
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553 |
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554 |
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555 def pathcopies(x, y, match=None): |
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556 """find {dst@y: src@x} copy mapping for directed compare""" |
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557 repo = x._repo |
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558 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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559 if debug: |
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560 repo.ui.debug( |
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561 b'debug.copies: searching copies from %s to %s\n' % (x, y) |
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562 ) |
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563 if x == y or not x or not y: |
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564 return {} |
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565 if y.rev() is None and x == y.p1(): |
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566 if debug: |
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567 repo.ui.debug(b'debug.copies: search mode: dirstate\n') |
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568 # short-circuit to avoid issues with merge states |
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569 return _dirstatecopies(repo, match) |
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570 a = y.ancestor(x) |
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571 if a == x: |
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572 if debug: |
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573 repo.ui.debug(b'debug.copies: search mode: forward\n') |
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574 copies = _forwardcopies(x, y, match=match) |
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575 elif a == y: |
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576 if debug: |
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577 repo.ui.debug(b'debug.copies: search mode: backward\n') |
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578 copies = _backwardrenames(x, y, match=match) |
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579 else: |
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580 if debug: |
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581 repo.ui.debug(b'debug.copies: search mode: combined\n') |
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582 base = None |
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583 if a.rev() != node.nullrev: |
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584 base = x |
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585 copies = _chain( |
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586 _backwardrenames(x, a, match=match), |
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587 _forwardcopies(a, y, base, match=match), |
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588 ) |
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|
589 _filter(x, y, copies) |
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590 return copies |
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591 |
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592 |
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593 def mergecopies(repo, c1, c2, base): |
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594 """ |
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595 Finds moves and copies between context c1 and c2 that are relevant for |
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596 merging. 'base' will be used as the merge base. |
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597 |
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598 Copytracing is used in commands like rebase, merge, unshelve, etc to merge |
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599 files that were moved/ copied in one merge parent and modified in another. |
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600 For example: |
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601 |
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602 o ---> 4 another commit |
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603 | |
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604 | o ---> 3 commit that modifies a.txt |
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605 | / |
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606 o / ---> 2 commit that moves a.txt to b.txt |
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607 |/ |
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608 o ---> 1 merge base |
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609 |
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610 If we try to rebase revision 3 on revision 4, since there is no a.txt in |
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611 revision 4, and if user have copytrace disabled, we prints the following |
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612 message: |
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613 |
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614 ```other changed <file> which local deleted``` |
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615 |
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616 Returns a tuple where: |
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617 |
44199
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618 "branch_copies" an instance of branch_copies. |
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619 |
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620 "diverge" is a mapping of source name -> list of destination names |
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621 for divergent renames. |
16794
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622 |
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623 This function calls different copytracing algorithms based on config. |
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624 """ |
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625 # avoid silly behavior for update from empty dir |
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626 if not c1 or not c2 or c1 == c2: |
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627 return branch_copies(), branch_copies(), {} |
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628 |
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629 narrowmatch = c1.repo().narrowmatch() |
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630 |
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|
631 # avoid silly behavior for parent -> working dir |
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|
632 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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|
633 return ( |
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|
634 branch_copies(_dirstatecopies(repo, narrowmatch)), |
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635 branch_copies(), |
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636 {}, |
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637 ) |
6646
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638 |
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639 copytracing = repo.ui.config(b'experimental', b'copytrace') |
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640 if stringutil.parsebool(copytracing) is False: |
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641 # stringutil.parsebool() returns None when it is unable to parse the |
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642 # value, so we should rely on making sure copytracing is on such cases |
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643 return branch_copies(), branch_copies(), {} |
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644 |
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645 if usechangesetcentricalgo(repo): |
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646 # The heuristics don't make sense when we need changeset-centric algos |
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647 return _fullcopytracing(repo, c1, c2, base) |
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648 |
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649 # Copy trace disabling is explicitly below the node == p1 logic above |
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650 # because the logic above is required for a simple copy to be kept across a |
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651 # rebase. |
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652 if copytracing == b'heuristics': |
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653 # Do full copytracing if only non-public revisions are involved as |
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654 # that will be fast enough and will also cover the copies which could |
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655 # be missed by heuristics |
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656 if _isfullcopytraceable(repo, c1, base): |
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657 return _fullcopytracing(repo, c1, c2, base) |
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658 return _heuristicscopytracing(repo, c1, c2, base) |
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659 else: |
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660 return _fullcopytracing(repo, c1, c2, base) |
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661 |
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662 |
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663 def _isfullcopytraceable(repo, c1, base): |
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664 """ Checks that if base, source and destination are all no-public branches, |
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665 if yes let's use the full copytrace algorithm for increased capabilities |
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666 since it will be fast enough. |
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667 |
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668 `experimental.copytrace.sourcecommitlimit` can be used to set a limit for |
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669 number of changesets from c1 to base such that if number of changesets are |
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670 more than the limit, full copytracing algorithm won't be used. |
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671 """ |
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672 if c1.rev() is None: |
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673 c1 = c1.p1() |
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674 if c1.mutable() and base.mutable(): |
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675 sourcecommitlimit = repo.ui.configint( |
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676 b'experimental', b'copytrace.sourcecommitlimit' |
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677 ) |
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678 commits = len(repo.revs(b'%d::%d', base.rev(), c1.rev())) |
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679 return commits < sourcecommitlimit |
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680 return False |
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681 |
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682 |
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683 def _checksinglesidecopies( |
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684 src, dsts1, m1, m2, mb, c2, base, copy, renamedelete |
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685 ): |
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686 if src not in m2: |
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687 # deleted on side 2 |
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688 if src not in m1: |
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689 # renamed on side 1, deleted on side 2 |
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690 renamedelete[src] = dsts1 |
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691 elif src not in mb: |
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692 # Work around the "short-circuit to avoid issues with merge states" |
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693 # thing in pathcopies(): pathcopies(x, y) can return a copy where the |
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694 # destination doesn't exist in y. |
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695 pass |
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696 elif mb[src] != m2[src] and not _related(c2[src], base[src]): |
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697 return |
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698 elif mb[src] != m2[src] or mb.flags(src) != m2.flags(src): |
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699 # modified on side 2 |
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700 for dst in dsts1: |
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701 copy[dst] = src |
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702 |
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703 |
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704 class branch_copies(object): |
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705 """Information about copies made on one side of a merge/graft. |
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706 |
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707 "copy" is a mapping from destination name -> source name, |
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708 where source is in c1 and destination is in c2 or vice-versa. |
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709 |
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710 "movewithdir" is a mapping from source name -> destination name, |
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711 where the file at source present in one context but not the other |
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712 needs to be moved to destination by the merge process, because the |
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713 other context moved the directory it is in. |
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714 |
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715 "renamedelete" is a mapping of source name -> list of destination |
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716 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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717 |
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718 "dirmove" is a mapping of detected source dir -> destination dir renames. |
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719 This is needed for handling changes to new files previously grafted into |
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720 renamed directories. |
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721 """ |
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722 |
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723 def __init__( |
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724 self, copy=None, renamedelete=None, dirmove=None, movewithdir=None |
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725 ): |
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726 self.copy = {} if copy is None else copy |
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727 self.renamedelete = {} if renamedelete is None else renamedelete |
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728 self.dirmove = {} if dirmove is None else dirmove |
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729 self.movewithdir = {} if movewithdir is None else movewithdir |
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730 |
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|
731 def __repr__(self): |
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732 return ( |
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733 '<branch_copies\n copy=%r\n renamedelete=%r\n dirmove=%r\n movewithdir=%r\n>' |
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734 % (self.copy, self.renamedelete, self.dirmove, self.movewithdir,) |
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735 ) |
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736 |
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737 |
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738 def _fullcopytracing(repo, c1, c2, base): |
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739 """ The full copytracing algorithm which finds all the new files that were |
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|
740 added from merge base up to the top commit and for each file it checks if |
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741 this file was copied from another file. |
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742 |
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|
743 This is pretty slow when a lot of changesets are involved but will track all |
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|
744 the copies. |
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|
745 """ |
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|
746 m1 = c1.manifest() |
f3f383efbeae
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diff
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|
747 m2 = c2.manifest() |
30186
f7ed5af31242
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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diff
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|
748 mb = base.manifest() |
6274
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|
749 |
42222
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|
750 copies1 = pathcopies(base, c1) |
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|
751 copies2 = pathcopies(base, c2) |
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|
752 |
44162
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|
753 if not (copies1 or copies2): |
44200
fa9ad1da2e77
merge: start using the per-side copy dicts
Martin von Zweigbergk <martinvonz@google.com>
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diff
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|
754 return branch_copies(), branch_copies(), {} |
44162
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|
755 |
42222
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|
756 inversecopies1 = {} |
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|
757 inversecopies2 = {} |
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|
758 for dst, src in copies1.items(): |
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|
759 inversecopies1.setdefault(src, []).append(dst) |
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|
760 for dst, src in copies2.items(): |
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|
761 inversecopies2.setdefault(src, []).append(dst) |
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|
762 |
44196
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|
763 copy1 = {} |
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|
764 copy2 = {} |
42222
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|
765 diverge = {} |
44196
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|
766 renamedelete1 = {} |
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|
767 renamedelete2 = {} |
42222
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|
768 allsources = set(inversecopies1) | set(inversecopies2) |
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|
769 for src in allsources: |
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|
770 dsts1 = inversecopies1.get(src) |
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|
771 dsts2 = inversecopies2.get(src) |
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|
772 if dsts1 and dsts2: |
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|
773 # copied/renamed on both sides |
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|
774 if src not in m1 and src not in m2: |
57203e0210f8
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|
775 # renamed on both sides |
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|
776 dsts1 = set(dsts1) |
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|
777 dsts2 = set(dsts2) |
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|
778 # If there's some overlap in the rename destinations, we |
57203e0210f8
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|
779 # consider it not divergent. For example, if side 1 copies 'a' |
57203e0210f8
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|
780 # to 'b' and 'c' and deletes 'a', and side 2 copies 'a' to 'c' |
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|
781 # and 'd' and deletes 'a'. |
57203e0210f8
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|
782 if dsts1 & dsts2: |
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43020
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changeset
|
783 for dst in dsts1 & dsts2: |
44196
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|
784 copy1[dst] = src |
6ca9f45b32b0
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|
785 copy2[dst] = src |
42222
57203e0210f8
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|
786 else: |
57203e0210f8
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|
787 diverge[src] = sorted(dsts1 | dsts2) |
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|
788 elif src in m1 and src in m2: |
57203e0210f8
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|
789 # copied on both sides |
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|
790 dsts1 = set(dsts1) |
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|
791 dsts2 = set(dsts2) |
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|
792 for dst in dsts1 & dsts2: |
44196
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|
793 copy1[dst] = src |
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|
794 copy2[dst] = src |
42222
57203e0210f8
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changeset
|
795 # TODO: Handle cases where it was renamed on one side and copied |
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|
796 # on the other side |
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|
797 elif dsts1: |
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|
798 # copied/renamed only on side 1 |
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|
799 _checksinglesidecopies( |
44196
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|
800 src, dsts1, m1, m2, mb, c2, base, copy1, renamedelete1 |
43076
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changeset
|
801 ) |
42222
57203e0210f8
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|
802 elif dsts2: |
57203e0210f8
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changeset
|
803 # copied/renamed only on side 2 |
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|
804 _checksinglesidecopies( |
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changeset
|
805 src, dsts2, m2, m1, mb, c1, base, copy2, renamedelete2 |
43076
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changeset
|
806 ) |
42222
57203e0210f8
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diff
changeset
|
807 |
26659
df66736a128e
copies: group bothnew with other sets
Matt Mackall <mpm@selenic.com>
parents:
26658
diff
changeset
|
808 # find interesting file sets from manifests |
39966
707c3804e607
narrow: move copies overrides to core
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39945
diff
changeset
|
809 addedinm1 = m1.filesnotin(mb, repo.narrowmatch()) |
707c3804e607
narrow: move copies overrides to core
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diff
changeset
|
810 addedinm2 = m2.filesnotin(mb, repo.narrowmatch()) |
42223
d69bc8ffbe6f
copies: inline _computenonoverlap() in mergecopies()
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42222
diff
changeset
|
811 u1 = sorted(addedinm1 - addedinm2) |
d69bc8ffbe6f
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diff
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|
812 u2 = sorted(addedinm2 - addedinm1) |
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changeset
|
813 |
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|
814 header = b" unmatched files in %s" |
42223
d69bc8ffbe6f
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changeset
|
815 if u1: |
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|
816 repo.ui.debug(b"%s:\n %s\n" % (header % b'local', b"\n ".join(u1))) |
42223
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|
817 if u2: |
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|
818 repo.ui.debug(b"%s:\n %s\n" % (header % b'other', b"\n ".join(u2))) |
6274
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diff
changeset
|
819 |
42166
85f5934016f9
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diff
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|
820 if repo.ui.debugflag: |
44163
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|
821 renamedeleteset = set() |
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|
822 divergeset = set() |
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|
823 for dsts in diverge.values(): |
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|
824 divergeset.update(dsts) |
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|
825 for dsts in renamedelete1.values(): |
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|
826 renamedeleteset.update(dsts) |
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|
827 for dsts in renamedelete2.values(): |
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|
828 renamedeleteset.update(dsts) |
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|
829 |
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|
830 repo.ui.debug( |
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|
831 b" all copies found (* = to merge, ! = divergent, " |
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|
832 b"% = renamed and deleted):\n" |
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|
833 ) |
44197
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changeset
|
834 for side, copies in ((b"local", copies1), (b"remote", copies2)): |
17e12938f8e7
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|
835 if not copies: |
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|
836 continue |
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changeset
|
837 repo.ui.debug(b" on %s side:\n" % side) |
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|
838 for f in sorted(copies): |
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changeset
|
839 note = b"" |
17e12938f8e7
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changeset
|
840 if f in copy1 or f in copy2: |
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changeset
|
841 note += b"*" |
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changeset
|
842 if f in divergeset: |
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changeset
|
843 note += b"!" |
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changeset
|
844 if f in renamedeleteset: |
17e12938f8e7
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changeset
|
845 note += b"%" |
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copies: print debug information about copies per side/branch
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changeset
|
846 repo.ui.debug( |
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copies: print debug information about copies per side/branch
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diff
changeset
|
847 b" src: '%s' -> dst: '%s' %s\n" % (copies[f], f, note) |
17e12938f8e7
copies: print debug information about copies per side/branch
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|
848 ) |
44163
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|
849 del renamedeleteset |
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|
850 del divergeset |
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851 |
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852 repo.ui.debug(b" checking for directory renames\n") |
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853 |
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854 dirmove1, movewithdir2 = _dir_renames(repo, c1, copy1, copies1, u2) |
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855 dirmove2, movewithdir1 = _dir_renames(repo, c2, copy2, copies2, u1) |
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856 |
44200
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857 branch_copies1 = branch_copies(copy1, renamedelete1, dirmove1, movewithdir1) |
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858 branch_copies2 = branch_copies(copy2, renamedelete2, dirmove2, movewithdir2) |
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859 |
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860 return branch_copies1, branch_copies2, diverge |
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861 |
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862 |
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863 def _dir_renames(repo, ctx, copy, fullcopy, addedfiles): |
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864 """Finds moved directories and files that should move with them. |
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865 |
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866 ctx: the context for one of the sides |
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867 copy: files copied on the same side (as ctx) |
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868 fullcopy: files copied on the same side (as ctx), including those that |
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869 merge.manifestmerge() won't care about |
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870 addedfiles: added files on the other side (compared to ctx) |
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871 """ |
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872 # generate a directory move map |
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873 d = ctx.dirs() |
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874 invalid = set() |
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875 dirmove = {} |
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876 |
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877 # examine each file copy for a potential directory move, which is |
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878 # when all the files in a directory are moved to a new directory |
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879 for dst, src in pycompat.iteritems(fullcopy): |
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880 dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst) |
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881 if dsrc in invalid: |
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882 # already seen to be uninteresting |
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883 continue |
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884 elif dsrc in d and ddst in d: |
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885 # directory wasn't entirely moved locally |
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|
886 invalid.add(dsrc) |
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887 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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888 # files from the same directory moved to two different places |
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|
889 invalid.add(dsrc) |
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890 else: |
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891 # looks good so far |
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892 dirmove[dsrc] = ddst |
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893 |
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894 for i in invalid: |
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|
895 if i in dirmove: |
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|
896 del dirmove[i] |
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897 del d, invalid |
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898 |
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899 if not dirmove: |
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900 return {}, {} |
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|
901 |
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902 dirmove = {k + b"/": v + b"/" for k, v in pycompat.iteritems(dirmove)} |
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903 |
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|
904 for d in dirmove: |
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|
905 repo.ui.debug( |
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|
906 b" discovered dir src: '%s' -> dst: '%s'\n" % (d, dirmove[d]) |
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|
907 ) |
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|
908 |
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parents:
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diff
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|
909 movewithdir = {} |
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|
910 # check unaccounted nonoverlapping files against directory moves |
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911 for f in addedfiles: |
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912 if f not in fullcopy: |
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|
913 for d in dirmove: |
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914 if f.startswith(d): |
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915 # new file added in a directory that was moved, move it |
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|
916 df = dirmove[d] + f[len(d) :] |
6426
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6425
diff
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|
917 if df not in copy: |
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|
918 movewithdir[f] = df |
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|
919 repo.ui.debug( |
43117
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|
920 b" pending file src: '%s' -> dst: '%s'\n" |
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|
921 % (f, df) |
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|
922 ) |
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|
923 break |
f3f383efbeae
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|
924 |
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|
925 return dirmove, movewithdir |
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|
926 |
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|
927 |
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|
928 def _heuristicscopytracing(repo, c1, c2, base): |
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929 """ Fast copytracing using filename heuristics |
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930 |
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|
931 Assumes that moves or renames are of following two types: |
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932 |
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|
933 1) Inside a directory only (same directory name but different filenames) |
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934 2) Move from one directory to another |
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935 (same filenames but different directory names) |
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936 |
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937 Works only when there are no merge commits in the "source branch". |
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938 Source branch is commits from base up to c2 not including base. |
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939 |
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940 If merge is involved it fallbacks to _fullcopytracing(). |
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941 |
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942 Can be used by setting the following config: |
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943 |
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944 [experimental] |
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945 copytrace = heuristics |
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946 |
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947 In some cases the copy/move candidates found by heuristics can be very large |
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948 in number and that will make the algorithm slow. The number of possible |
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|
949 candidates to check can be limited by using the config |
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950 `experimental.copytrace.movecandidateslimit` which defaults to 100. |
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951 """ |
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952 |
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953 if c1.rev() is None: |
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954 c1 = c1.p1() |
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955 if c2.rev() is None: |
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956 c2 = c2.p1() |
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957 |
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958 changedfiles = set() |
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959 m1 = c1.manifest() |
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960 if not repo.revs(b'%d::%d', base.rev(), c2.rev()): |
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961 # If base is not in c2 branch, we switch to fullcopytracing |
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|
962 repo.ui.debug( |
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963 b"switching to full copytracing as base is not " |
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964 b"an ancestor of c2\n" |
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965 ) |
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966 return _fullcopytracing(repo, c1, c2, base) |
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967 |
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968 ctx = c2 |
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969 while ctx != base: |
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970 if len(ctx.parents()) == 2: |
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971 # To keep things simple let's not handle merges |
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972 repo.ui.debug(b"switching to full copytracing because of merges\n") |
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973 return _fullcopytracing(repo, c1, c2, base) |
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974 changedfiles.update(ctx.files()) |
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975 ctx = ctx.p1() |
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976 |
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977 copies2 = {} |
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978 cp = _forwardcopies(base, c2) |
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979 for dst, src in pycompat.iteritems(cp): |
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980 if src in m1: |
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981 copies2[dst] = src |
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982 |
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983 # file is missing if it isn't present in the destination, but is present in |
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984 # the base and present in the source. |
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985 # Presence in the base is important to exclude added files, presence in the |
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986 # source is important to exclude removed files. |
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987 filt = lambda f: f not in m1 and f in base and f in c2 |
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988 missingfiles = [f for f in changedfiles if filt(f)] |
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989 |
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990 copies1 = {} |
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991 if missingfiles: |
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992 basenametofilename = collections.defaultdict(list) |
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993 dirnametofilename = collections.defaultdict(list) |
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994 |
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995 for f in m1.filesnotin(base.manifest()): |
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996 basename = os.path.basename(f) |
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997 dirname = os.path.dirname(f) |
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998 basenametofilename[basename].append(f) |
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999 dirnametofilename[dirname].append(f) |
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1000 |
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1001 for f in missingfiles: |
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1002 basename = os.path.basename(f) |
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1003 dirname = os.path.dirname(f) |
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1004 samebasename = basenametofilename[basename] |
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1005 samedirname = dirnametofilename[dirname] |
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1006 movecandidates = samebasename + samedirname |
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1007 # f is guaranteed to be present in c2, that's why |
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1008 # c2.filectx(f) won't fail |
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1009 f2 = c2.filectx(f) |
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1010 # we can have a lot of candidates which can slow down the heuristics |
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1011 # config value to limit the number of candidates moves to check |
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1012 maxcandidates = repo.ui.configint( |
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1013 b'experimental', b'copytrace.movecandidateslimit' |
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1014 ) |
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1015 |
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1016 if len(movecandidates) > maxcandidates: |
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1017 repo.ui.status( |
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1018 _( |
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1019 b"skipping copytracing for '%s', more " |
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1020 b"candidates than the limit: %d\n" |
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1021 ) |
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1022 % (f, len(movecandidates)) |
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1023 ) |
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1024 continue |
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1025 |
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1026 for candidate in movecandidates: |
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1027 f1 = c1.filectx(candidate) |
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1028 if _related(f1, f2): |
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1029 # if there are a few related copies then we'll merge |
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1030 # changes into all of them. This matches the behaviour |
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1031 # of upstream copytracing |
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1032 copies1[candidate] = f |
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1033 |
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1034 return branch_copies(copies1), branch_copies(copies2), {} |
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1035 |
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1036 |
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1037 def _related(f1, f2): |
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1038 """return True if f1 and f2 filectx have a common ancestor |
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1039 |
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1040 Walk back to common ancestor to see if the two files originate |
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1041 from the same file. Since workingfilectx's rev() is None it messes |
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1042 up the integer comparison logic, hence the pre-step check for |
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1043 None (f1 and f2 can only be workingfilectx's initially). |
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1044 """ |
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1045 |
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1046 if f1 == f2: |
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1047 return True # a match |
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1048 |
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1049 g1, g2 = f1.ancestors(), f2.ancestors() |
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1050 try: |
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1051 f1r, f2r = f1.linkrev(), f2.linkrev() |
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1052 |
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1053 if f1r is None: |
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1054 f1 = next(g1) |
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1055 if f2r is None: |
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1056 f2 = next(g2) |
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1057 |
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1058 while True: |
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1059 f1r, f2r = f1.linkrev(), f2.linkrev() |
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1060 if f1r > f2r: |
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1061 f1 = next(g1) |
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1062 elif f2r > f1r: |
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1063 f2 = next(g2) |
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1064 else: # f1 and f2 point to files in the same linkrev |
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1065 return f1 == f2 # true if they point to the same file |
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1066 except StopIteration: |
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1067 return False |
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1068 |
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1069 |
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1070 def graftcopies(wctx, ctx, base): |
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1071 """reproduce copies between base and ctx in the wctx |
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1072 |
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1073 Unlike mergecopies(), this function will only consider copies between base |
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1074 and ctx; it will ignore copies between base and wctx. Also unlike |
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1075 mergecopies(), this function will apply copies to the working copy (instead |
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parents:
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1076 of just returning information about the copies). That makes it cheaper |
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1077 (especially in the common case of base==ctx.p1()) and useful also when |
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parents:
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1078 experimental.copytrace=off. |
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1079 |
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1080 merge.update() will have already marked most copies, but it will only |
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1081 mark copies if it thinks the source files are related (see |
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1082 merge._related()). It will also not mark copies if the file wasn't modified |
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parents:
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1083 on the local side. This function adds the copies that were "missed" |
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parents:
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1084 by merge.update(). |
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1085 """ |
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1086 new_copies = pathcopies(base, ctx) |
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1087 _filter(wctx.p1(), wctx, new_copies) |
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1088 for dst, src in pycompat.iteritems(new_copies): |
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1089 wctx[dst].markcopied(src) |