Mercurial > hg
annotate mercurial/copies.py @ 45672:f877b3628015
copies: return None instead of ChangingFiles when relevant
If they are not relevant data, they are no need to fetch them.
Differential Revision: https://phab.mercurial-scm.org/D9140
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Thu, 01 Oct 2020 09:42:39 +0200 |
parents | a8fb29b05f92 |
children | 7990e7d957b0 |
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 from .revlogutils import flagutil |
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28 |
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29 |
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30 def _filter(src, dst, t): |
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31 """filters out invalid copies after chaining""" |
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32 |
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33 # When _chain()'ing copies in 'a' (from 'src' via some other commit 'mid') |
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34 # with copies in 'b' (from 'mid' to 'dst'), we can get the different cases |
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35 # in the following table (not including trivial cases). For example, case 2 |
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36 # is where a file existed in 'src' and remained under that name in 'mid' and |
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37 # then was renamed between 'mid' and 'dst'. |
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38 # |
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39 # case src mid dst result |
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40 # 1 x y - - |
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41 # 2 x y y x->y |
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42 # 3 x y x - |
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43 # 4 x y z x->z |
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44 # 5 - x y - |
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45 # 6 x x y x->y |
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46 # |
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47 # _chain() takes care of chaining the copies in 'a' and 'b', but it |
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48 # cannot tell the difference between cases 1 and 2, between 3 and 4, or |
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49 # between 5 and 6, so it includes all cases in its result. |
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50 # Cases 1, 3, and 5 are then removed by _filter(). |
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51 |
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52 for k, v in list(t.items()): |
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53 # remove copies from files that didn't exist |
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54 if v not in src: |
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55 del t[k] |
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56 # remove criss-crossed copies |
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57 elif k in src and v in dst: |
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58 del t[k] |
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59 # remove copies to files that were then removed |
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60 elif k not in dst: |
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61 del t[k] |
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62 |
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63 |
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64 def _chain(prefix, suffix): |
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65 """chain two sets of copies 'prefix' and 'suffix'""" |
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66 result = prefix.copy() |
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67 for key, value in pycompat.iteritems(suffix): |
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68 result[key] = prefix.get(value, value) |
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69 return result |
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70 |
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71 |
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72 def _tracefile(fctx, am, basemf): |
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73 """return file context that is the ancestor of fctx present in ancestor |
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74 manifest am |
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75 |
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76 Note: we used to try and stop after a given limit, however checking if that |
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77 limit is reached turned out to be very expensive. we are better off |
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78 disabling that feature.""" |
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79 |
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80 for f in fctx.ancestors(): |
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81 path = f.path() |
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82 if am.get(path, None) == f.filenode(): |
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83 return path |
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84 if basemf and basemf.get(path, None) == f.filenode(): |
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85 return path |
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86 |
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87 |
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88 def _dirstatecopies(repo, match=None): |
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89 ds = repo.dirstate |
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90 c = ds.copies().copy() |
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91 for k in list(c): |
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92 if ds[k] not in b'anm' or (match and not match(k)): |
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93 del c[k] |
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94 return c |
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95 |
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96 |
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97 def _computeforwardmissing(a, b, match=None): |
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98 """Computes which files are in b but not a. |
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99 This is its own function so extensions can easily wrap this call to see what |
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100 files _forwardcopies is about to process. |
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101 """ |
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102 ma = a.manifest() |
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103 mb = b.manifest() |
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104 return mb.filesnotin(ma, match=match) |
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105 |
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106 |
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107 def usechangesetcentricalgo(repo): |
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108 """Checks if we should use changeset-centric copy algorithms""" |
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109 if repo.filecopiesmode == b'changeset-sidedata': |
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110 return True |
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111 readfrom = repo.ui.config(b'experimental', b'copies.read-from') |
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112 changesetsource = (b'changeset-only', b'compatibility') |
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113 return readfrom in changesetsource |
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114 |
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115 |
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116 def _committedforwardcopies(a, b, base, match): |
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117 """Like _forwardcopies(), but b.rev() cannot be None (working copy)""" |
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118 # files might have to be traced back to the fctx parent of the last |
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119 # one-side-only changeset, but not further back than that |
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120 repo = a._repo |
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121 |
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122 if usechangesetcentricalgo(repo): |
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123 return _changesetforwardcopies(a, b, match) |
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124 |
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125 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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126 dbg = repo.ui.debug |
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127 if debug: |
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128 dbg(b'debug.copies: looking into rename from %s to %s\n' % (a, b)) |
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129 am = a.manifest() |
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130 basemf = None if base is None else base.manifest() |
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131 |
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132 # find where new files came from |
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133 # we currently don't try to find where old files went, too expensive |
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134 # this means we can miss a case like 'hg rm b; hg cp a b' |
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135 cm = {} |
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136 |
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137 # Computing the forward missing is quite expensive on large manifests, since |
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138 # it compares the entire manifests. We can optimize it in the common use |
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139 # case of computing what copies are in a commit versus its parent (like |
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140 # during a rebase or histedit). Note, we exclude merge commits from this |
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141 # optimization, since the ctx.files() for a merge commit is not correct for |
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142 # this comparison. |
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143 forwardmissingmatch = match |
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144 if b.p1() == a and b.p2().node() == node.nullid: |
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145 filesmatcher = matchmod.exact(b.files()) |
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146 forwardmissingmatch = matchmod.intersectmatchers(match, filesmatcher) |
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147 missing = _computeforwardmissing(a, b, match=forwardmissingmatch) |
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148 |
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149 ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) |
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150 |
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151 if debug: |
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152 dbg(b'debug.copies: missing files to search: %d\n' % len(missing)) |
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153 |
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154 for f in sorted(missing): |
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155 if debug: |
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156 dbg(b'debug.copies: tracing file: %s\n' % f) |
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157 fctx = b[f] |
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158 fctx._ancestrycontext = ancestrycontext |
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159 |
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160 if debug: |
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161 start = util.timer() |
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162 opath = _tracefile(fctx, am, basemf) |
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163 if opath: |
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164 if debug: |
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165 dbg(b'debug.copies: rename of: %s\n' % opath) |
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166 cm[f] = opath |
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167 if debug: |
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168 dbg( |
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169 b'debug.copies: time: %f seconds\n' |
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170 % (util.timer() - start) |
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171 ) |
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172 return cm |
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173 |
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174 |
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175 def _revinfo_getter(repo): |
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176 """returns a function that returns the following data given a <rev>" |
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177 |
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178 * p1: revision number of first parent |
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179 * p2: revision number of first parent |
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180 * changes: a ChangingFiles object |
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181 """ |
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182 cl = repo.changelog |
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183 parents = cl.parentrevs |
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184 flags = cl.flags |
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185 |
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186 HASCOPIESINFO = flagutil.REVIDX_HASCOPIESINFO |
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187 |
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188 changelogrevision = cl.changelogrevision |
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189 |
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190 # A small cache to avoid doing the work twice for merges |
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191 # |
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192 # In the vast majority of cases, if we ask information for a revision |
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193 # about 1 parent, we'll later ask it for the other. So it make sense to |
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194 # keep the information around when reaching the first parent of a merge |
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195 # and dropping it after it was provided for the second parents. |
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196 # |
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197 # It exists cases were only one parent of the merge will be walked. It |
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198 # happens when the "destination" the copy tracing is descendant from a |
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199 # new root, not common with the "source". In that case, we will only walk |
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200 # through merge parents that are descendant of changesets common |
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201 # between "source" and "destination". |
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202 # |
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203 # With the current case implementation if such changesets have a copy |
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204 # information, we'll keep them in memory until the end of |
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205 # _changesetforwardcopies. We don't expect the case to be frequent |
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206 # enough to matters. |
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207 # |
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208 # In addition, it would be possible to reach pathological case, were |
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209 # many first parent are met before any second parent is reached. In |
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210 # that case the cache could grow. If this even become an issue one can |
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211 # safely introduce a maximum cache size. This would trade extra CPU/IO |
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212 # time to save memory. |
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213 merge_caches = {} |
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214 |
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215 def revinfo(rev): |
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216 p1, p2 = parents(rev) |
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217 value = None |
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218 e = merge_caches.pop(rev, None) |
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219 if e is not None: |
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220 return e |
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221 changes = None |
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222 if flags(rev) & HASCOPIESINFO: |
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223 changes = changelogrevision(rev).changes |
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224 value = (p1, p2, changes) |
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225 if p1 != node.nullrev and p2 != node.nullrev: |
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226 # XXX some case we over cache, IGNORE |
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227 merge_caches[rev] = value |
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228 return value |
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229 |
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230 return revinfo |
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231 |
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232 |
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233 def _changesetforwardcopies(a, b, match): |
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234 if a.rev() in (node.nullrev, b.rev()): |
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235 return {} |
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236 |
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237 repo = a.repo().unfiltered() |
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238 children = {} |
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239 |
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240 cl = repo.changelog |
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241 isancestor = cl.isancestorrev # XXX we should had chaching to this. |
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242 missingrevs = cl.findmissingrevs(common=[a.rev()], heads=[b.rev()]) |
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243 mrset = set(missingrevs) |
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244 roots = set() |
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245 for r in missingrevs: |
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246 for p in cl.parentrevs(r): |
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247 if p == node.nullrev: |
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248 continue |
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249 if p not in children: |
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250 children[p] = [r] |
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251 else: |
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252 children[p].append(r) |
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253 if p not in mrset: |
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254 roots.add(p) |
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255 if not roots: |
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256 # no common revision to track copies from |
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257 return {} |
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258 min_root = min(roots) |
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259 |
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260 from_head = set( |
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261 cl.reachableroots(min_root, [b.rev()], list(roots), includepath=True) |
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262 ) |
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263 |
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264 iterrevs = set(from_head) |
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265 iterrevs &= mrset |
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266 iterrevs.update(roots) |
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267 iterrevs.remove(b.rev()) |
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268 revs = sorted(iterrevs) |
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269 |
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270 if repo.filecopiesmode == b'changeset-sidedata': |
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271 revinfo = _revinfo_getter(repo) |
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272 return _combine_changeset_copies( |
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273 revs, children, b.rev(), revinfo, match, isancestor |
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274 ) |
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275 else: |
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276 revinfo = _revinfo_getter_extra(repo) |
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277 return _combine_changeset_copies_extra( |
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278 revs, children, b.rev(), revinfo, match, isancestor |
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279 ) |
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280 |
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281 |
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282 def _combine_changeset_copies( |
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283 revs, children, targetrev, revinfo, match, isancestor |
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284 ): |
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285 """combine the copies information for each item of iterrevs |
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286 |
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287 revs: sorted iterable of revision to visit |
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288 children: a {parent: [children]} mapping. |
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289 targetrev: the final copies destination revision (not in iterrevs) |
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290 revinfo(rev): a function that return (p1, p2, p1copies, p2copies, removed) |
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291 match: a matcher |
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292 |
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293 It returns the aggregated copies information for `targetrev`. |
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294 """ |
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295 all_copies = {} |
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296 alwaysmatch = match.always() |
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297 for r in revs: |
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298 copies = all_copies.pop(r, None) |
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299 if copies is None: |
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300 # this is a root |
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301 copies = {} |
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302 for i, c in enumerate(children[r]): |
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303 p1, p2, changes = revinfo(c) |
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304 childcopies = {} |
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305 if r == p1: |
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306 parent = 1 |
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307 if changes is not None: |
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308 childcopies = changes.copied_from_p1 |
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309 else: |
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310 assert r == p2 |
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311 parent = 2 |
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312 if changes is not None: |
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313 childcopies = changes.copied_from_p2 |
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314 if not alwaysmatch: |
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315 childcopies = { |
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316 dst: src for dst, src in childcopies.items() if match(dst) |
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317 } |
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318 newcopies = copies |
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319 if childcopies: |
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320 newcopies = copies.copy() |
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321 for dest, source in pycompat.iteritems(childcopies): |
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322 prev = copies.get(source) |
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323 if prev is not None and prev[1] is not None: |
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324 source = prev[1] |
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325 newcopies[dest] = (c, source) |
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326 assert newcopies is not copies |
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327 if changes is not None: |
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328 for f in changes.removed: |
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329 if f in newcopies: |
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330 if newcopies is copies: |
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331 # copy on write to avoid affecting potential other |
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332 # branches. when there are no other branches, this |
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333 # could be avoided. |
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334 newcopies = copies.copy() |
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335 newcopies[f] = (c, None) |
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336 othercopies = all_copies.get(c) |
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337 if othercopies is None: |
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338 all_copies[c] = newcopies |
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339 else: |
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340 # we are the second parent to work on c, we need to merge our |
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341 # work with the other. |
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342 # |
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343 # In case of conflict, parent 1 take precedence over parent 2. |
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344 # This is an arbitrary choice made anew when implementing |
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345 # changeset based copies. It was made without regards with |
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346 # potential filelog related behavior. |
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347 if parent == 1: |
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348 _merge_copies_dict( |
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349 othercopies, newcopies, isancestor, changes |
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350 ) |
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351 else: |
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352 _merge_copies_dict( |
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353 newcopies, othercopies, isancestor, changes |
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354 ) |
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355 all_copies[c] = newcopies |
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356 |
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357 final_copies = {} |
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358 for dest, (tt, source) in all_copies[targetrev].items(): |
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359 if source is not None: |
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360 final_copies[dest] = source |
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361 return final_copies |
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362 |
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363 |
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364 def _merge_copies_dict(minor, major, isancestor, changes): |
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365 """merge two copies-mapping together, minor and major |
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366 |
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367 In case of conflict, value from "major" will be picked. |
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368 |
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369 - `isancestors(low_rev, high_rev)`: callable return True if `low_rev` is an |
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370 ancestors of `high_rev`, |
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371 |
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372 - `ismerged(path)`: callable return True if `path` have been merged in the |
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373 current revision, |
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374 """ |
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375 for dest, value in major.items(): |
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376 other = minor.get(dest) |
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377 if other is None: |
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378 minor[dest] = value |
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379 else: |
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380 new_tt = value[0] |
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381 other_tt = other[0] |
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382 if value[1] == other[1]: |
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383 continue |
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384 # content from "major" wins, unless it is older |
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385 # than the branch point or there is a merge |
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386 if new_tt == other_tt: |
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387 minor[dest] = value |
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388 elif ( |
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389 changes is not None |
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390 and value[1] is None |
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391 and dest in changes.salvaged |
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392 ): |
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393 pass |
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394 elif ( |
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395 changes is not None |
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396 and other[1] is None |
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397 and dest in changes.salvaged |
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398 ): |
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399 minor[dest] = value |
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400 elif not isancestor(new_tt, other_tt): |
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401 minor[dest] = value |
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402 elif changes is not None and dest in changes.merged: |
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403 minor[dest] = value |
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404 |
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405 |
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406 def _revinfo_getter_extra(repo): |
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407 """return a function that return multiple data given a <rev>"i |
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408 |
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409 * p1: revision number of first parent |
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410 * p2: revision number of first parent |
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411 * p1copies: mapping of copies from p1 |
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412 * p2copies: mapping of copies from p2 |
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413 * removed: a list of removed files |
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414 * ismerged: a callback to know if file was merged in that revision |
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415 """ |
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416 cl = repo.changelog |
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417 parents = cl.parentrevs |
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418 |
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419 def get_ismerged(rev): |
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420 ctx = repo[rev] |
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421 |
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422 def ismerged(path): |
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423 if path not in ctx.files(): |
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424 return False |
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425 fctx = ctx[path] |
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426 parents = fctx._filelog.parents(fctx._filenode) |
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427 nb_parents = 0 |
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428 for n in parents: |
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429 if n != node.nullid: |
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430 nb_parents += 1 |
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431 return nb_parents >= 2 |
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432 |
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433 return ismerged |
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434 |
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435 def revinfo(rev): |
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436 p1, p2 = parents(rev) |
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437 ctx = repo[rev] |
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438 p1copies, p2copies = ctx._copies |
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439 removed = ctx.filesremoved() |
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440 return p1, p2, p1copies, p2copies, removed, get_ismerged(rev) |
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441 |
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442 return revinfo |
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443 |
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444 |
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445 def _combine_changeset_copies_extra( |
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446 revs, children, targetrev, revinfo, match, isancestor |
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447 ): |
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448 """version of `_combine_changeset_copies` that works with the Google |
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449 specific "extra" based storage for copy information""" |
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450 all_copies = {} |
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451 alwaysmatch = match.always() |
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452 for r in revs: |
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453 copies = all_copies.pop(r, None) |
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454 if copies is None: |
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455 # this is a root |
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456 copies = {} |
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457 for i, c in enumerate(children[r]): |
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458 p1, p2, p1copies, p2copies, removed, ismerged = revinfo(c) |
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459 if r == p1: |
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460 parent = 1 |
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461 childcopies = p1copies |
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462 else: |
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463 assert r == p2 |
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464 parent = 2 |
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465 childcopies = p2copies |
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466 if not alwaysmatch: |
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467 childcopies = { |
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468 dst: src for dst, src in childcopies.items() if match(dst) |
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469 } |
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470 newcopies = copies |
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471 if childcopies: |
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472 newcopies = copies.copy() |
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473 for dest, source in pycompat.iteritems(childcopies): |
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474 prev = copies.get(source) |
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475 if prev is not None and prev[1] is not None: |
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476 source = prev[1] |
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477 newcopies[dest] = (c, source) |
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478 assert newcopies is not copies |
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479 for f in removed: |
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480 if f in newcopies: |
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481 if newcopies is copies: |
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482 # copy on write to avoid affecting potential other |
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483 # branches. when there are no other branches, this |
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484 # could be avoided. |
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485 newcopies = copies.copy() |
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486 newcopies[f] = (c, None) |
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487 othercopies = all_copies.get(c) |
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488 if othercopies is None: |
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489 all_copies[c] = newcopies |
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490 else: |
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491 # we are the second parent to work on c, we need to merge our |
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492 # work with the other. |
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493 # |
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494 # In case of conflict, parent 1 take precedence over parent 2. |
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495 # This is an arbitrary choice made anew when implementing |
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496 # changeset based copies. It was made without regards with |
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497 # potential filelog related behavior. |
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498 if parent == 1: |
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499 _merge_copies_dict_extra( |
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500 othercopies, newcopies, isancestor, ismerged |
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501 ) |
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502 else: |
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503 _merge_copies_dict_extra( |
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504 newcopies, othercopies, isancestor, ismerged |
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505 ) |
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506 all_copies[c] = newcopies |
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507 |
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508 final_copies = {} |
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509 for dest, (tt, source) in all_copies[targetrev].items(): |
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510 if source is not None: |
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511 final_copies[dest] = source |
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512 return final_copies |
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513 |
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514 |
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515 def _merge_copies_dict_extra(minor, major, isancestor, ismerged): |
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516 """version of `_merge_copies_dict` that works with the Google |
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517 specific "extra" based storage for copy information""" |
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518 for dest, value in major.items(): |
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519 other = minor.get(dest) |
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520 if other is None: |
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521 minor[dest] = value |
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522 else: |
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523 new_tt = value[0] |
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524 other_tt = other[0] |
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525 if value[1] == other[1]: |
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|
526 continue |
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527 # content from "major" wins, unless it is older |
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528 # than the branch point or there is a merge |
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529 if ( |
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530 new_tt == other_tt |
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531 or not isancestor(new_tt, other_tt) |
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532 or ismerged(dest) |
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533 ): |
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534 minor[dest] = value |
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535 |
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536 |
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537 def _forwardcopies(a, b, base=None, match=None): |
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538 """find {dst@b: src@a} copy mapping where a is an ancestor of b""" |
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539 |
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540 if base is None: |
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541 base = a |
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542 match = a.repo().narrowmatch(match) |
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543 # check for working copy |
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544 if b.rev() is None: |
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545 cm = _committedforwardcopies(a, b.p1(), base, match) |
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546 # combine copies from dirstate if necessary |
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547 copies = _chain(cm, _dirstatecopies(b._repo, match)) |
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548 else: |
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549 copies = _committedforwardcopies(a, b, base, match) |
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550 return copies |
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551 |
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552 |
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553 def _backwardrenames(a, b, match): |
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554 if a._repo.ui.config(b'experimental', b'copytrace') == b'off': |
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555 return {} |
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556 |
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557 # Even though we're not taking copies into account, 1:n rename situations |
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558 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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559 # arbitrarily pick one of the renames. |
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560 # We don't want to pass in "match" here, since that would filter |
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561 # the destination by it. Since we're reversing the copies, we want |
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562 # to filter the source instead. |
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563 f = _forwardcopies(b, a) |
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564 r = {} |
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565 for k, v in sorted(pycompat.iteritems(f)): |
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566 if match and not match(v): |
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567 continue |
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568 # remove copies |
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569 if v in a: |
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570 continue |
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571 r[v] = k |
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572 return r |
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573 |
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574 |
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575 def pathcopies(x, y, match=None): |
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576 """find {dst@y: src@x} copy mapping for directed compare""" |
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577 repo = x._repo |
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578 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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579 if debug: |
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580 repo.ui.debug( |
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581 b'debug.copies: searching copies from %s to %s\n' % (x, y) |
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582 ) |
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583 if x == y or not x or not y: |
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584 return {} |
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585 if y.rev() is None and x == y.p1(): |
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586 if debug: |
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587 repo.ui.debug(b'debug.copies: search mode: dirstate\n') |
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588 # short-circuit to avoid issues with merge states |
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589 return _dirstatecopies(repo, match) |
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590 a = y.ancestor(x) |
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591 if a == x: |
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592 if debug: |
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593 repo.ui.debug(b'debug.copies: search mode: forward\n') |
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594 copies = _forwardcopies(x, y, match=match) |
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595 elif a == y: |
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596 if debug: |
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597 repo.ui.debug(b'debug.copies: search mode: backward\n') |
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598 copies = _backwardrenames(x, y, match=match) |
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599 else: |
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600 if debug: |
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601 repo.ui.debug(b'debug.copies: search mode: combined\n') |
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602 base = None |
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603 if a.rev() != node.nullrev: |
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604 base = x |
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605 copies = _chain( |
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606 _backwardrenames(x, a, match=match), |
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607 _forwardcopies(a, y, base, match=match), |
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608 ) |
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609 _filter(x, y, copies) |
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610 return copies |
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611 |
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612 |
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613 def mergecopies(repo, c1, c2, base): |
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614 """ |
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615 Finds moves and copies between context c1 and c2 that are relevant for |
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616 merging. 'base' will be used as the merge base. |
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617 |
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618 Copytracing is used in commands like rebase, merge, unshelve, etc to merge |
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619 files that were moved/ copied in one merge parent and modified in another. |
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620 For example: |
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621 |
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622 o ---> 4 another commit |
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623 | |
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624 | o ---> 3 commit that modifies a.txt |
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625 | / |
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626 o / ---> 2 commit that moves a.txt to b.txt |
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627 |/ |
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628 o ---> 1 merge base |
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629 |
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630 If we try to rebase revision 3 on revision 4, since there is no a.txt in |
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631 revision 4, and if user have copytrace disabled, we prints the following |
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632 message: |
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633 |
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634 ```other changed <file> which local deleted``` |
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635 |
44199
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636 Returns a tuple where: |
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637 |
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638 "branch_copies" an instance of branch_copies. |
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639 |
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640 "diverge" is a mapping of source name -> list of destination names |
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641 for divergent renames. |
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642 |
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643 This function calls different copytracing algorithms based on config. |
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644 """ |
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645 # avoid silly behavior for update from empty dir |
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646 if not c1 or not c2 or c1 == c2: |
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647 return branch_copies(), branch_copies(), {} |
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648 |
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649 narrowmatch = c1.repo().narrowmatch() |
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650 |
6646
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651 # avoid silly behavior for parent -> working dir |
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652 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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653 return ( |
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654 branch_copies(_dirstatecopies(repo, narrowmatch)), |
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655 branch_copies(), |
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656 {}, |
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657 ) |
6646
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658 |
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659 copytracing = repo.ui.config(b'experimental', b'copytrace') |
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660 if stringutil.parsebool(copytracing) is False: |
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661 # stringutil.parsebool() returns None when it is unable to parse the |
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662 # value, so we should rely on making sure copytracing is on such cases |
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663 return branch_copies(), branch_copies(), {} |
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664 |
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665 if usechangesetcentricalgo(repo): |
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666 # The heuristics don't make sense when we need changeset-centric algos |
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667 return _fullcopytracing(repo, c1, c2, base) |
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668 |
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669 # Copy trace disabling is explicitly below the node == p1 logic above |
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670 # because the logic above is required for a simple copy to be kept across a |
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671 # rebase. |
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672 if copytracing == b'heuristics': |
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673 # Do full copytracing if only non-public revisions are involved as |
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674 # that will be fast enough and will also cover the copies which could |
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675 # be missed by heuristics |
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676 if _isfullcopytraceable(repo, c1, base): |
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677 return _fullcopytracing(repo, c1, c2, base) |
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678 return _heuristicscopytracing(repo, c1, c2, base) |
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679 else: |
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680 return _fullcopytracing(repo, c1, c2, base) |
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681 |
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682 |
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683 def _isfullcopytraceable(repo, c1, base): |
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684 """ Checks that if base, source and destination are all no-public branches, |
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685 if yes let's use the full copytrace algorithm for increased capabilities |
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686 since it will be fast enough. |
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687 |
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688 `experimental.copytrace.sourcecommitlimit` can be used to set a limit for |
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689 number of changesets from c1 to base such that if number of changesets are |
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690 more than the limit, full copytracing algorithm won't be used. |
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691 """ |
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692 if c1.rev() is None: |
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693 c1 = c1.p1() |
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694 if c1.mutable() and base.mutable(): |
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695 sourcecommitlimit = repo.ui.configint( |
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696 b'experimental', b'copytrace.sourcecommitlimit' |
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697 ) |
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698 commits = len(repo.revs(b'%d::%d', base.rev(), c1.rev())) |
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699 return commits < sourcecommitlimit |
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700 return False |
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701 |
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702 |
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|
703 def _checksinglesidecopies( |
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704 src, dsts1, m1, m2, mb, c2, base, copy, renamedelete |
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|
705 ): |
42222
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706 if src not in m2: |
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707 # deleted on side 2 |
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708 if src not in m1: |
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709 # renamed on side 1, deleted on side 2 |
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|
710 renamedelete[src] = dsts1 |
44210
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711 elif src not in mb: |
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|
712 # Work around the "short-circuit to avoid issues with merge states" |
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|
713 # thing in pathcopies(): pathcopies(x, y) can return a copy where the |
d0c3eead515a
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|
714 # destination doesn't exist in y. |
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44200
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|
715 pass |
44909
d452acc8cce8
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diff
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|
716 elif mb[src] != m2[src] and not _related(c2[src], base[src]): |
d452acc8cce8
flags: account for flag change when tracking rename relevant to merge
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|
717 return |
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|
718 elif mb[src] != m2[src] or mb.flags(src) != m2.flags(src): |
42222
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719 # modified on side 2 |
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copies: calculate mergecopies() based on pathcopies()
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|
720 for dst in dsts1: |
44237
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diff
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|
721 copy[dst] = src |
42222
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722 |
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723 |
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|
724 class branch_copies(object): |
7f8bdee0034e
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|
725 """Information about copies made on one side of a merge/graft. |
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726 |
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727 "copy" is a mapping from destination name -> source name, |
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|
728 where source is in c1 and destination is in c2 or vice-versa. |
7f8bdee0034e
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|
729 |
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|
730 "movewithdir" is a mapping from source name -> destination name, |
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|
731 where the file at source present in one context but not the other |
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|
732 needs to be moved to destination by the merge process, because the |
7f8bdee0034e
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|
733 other context moved the directory it is in. |
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734 |
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735 "renamedelete" is a mapping of source name -> list of destination |
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736 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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|
737 |
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|
738 "dirmove" is a mapping of detected source dir -> destination dir renames. |
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|
739 This is needed for handling changes to new files previously grafted into |
7f8bdee0034e
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|
740 renamed directories. |
7f8bdee0034e
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|
741 """ |
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|
742 |
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|
743 def __init__( |
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744 self, copy=None, renamedelete=None, dirmove=None, movewithdir=None |
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745 ): |
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|
746 self.copy = {} if copy is None else copy |
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747 self.renamedelete = {} if renamedelete is None else renamedelete |
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748 self.dirmove = {} if dirmove is None else dirmove |
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749 self.movewithdir = {} if movewithdir is None else movewithdir |
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750 |
44994
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751 def __repr__(self): |
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752 return ( |
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753 '<branch_copies\n copy=%r\n renamedelete=%r\n dirmove=%r\n movewithdir=%r\n>' |
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|
754 % (self.copy, self.renamedelete, self.dirmove, self.movewithdir,) |
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|
755 ) |
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|
756 |
44199
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|
757 |
34078
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|
758 def _fullcopytracing(repo, c1, c2, base): |
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759 """ The full copytracing algorithm which finds all the new files that were |
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760 added from merge base up to the top commit and for each file it checks if |
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|
761 this file was copied from another file. |
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762 |
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|
763 This is pretty slow when a lot of changesets are involved but will track all |
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|
764 the copies. |
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|
765 """ |
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|
766 m1 = c1.manifest() |
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|
767 m2 = c2.manifest() |
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768 mb = base.manifest() |
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769 |
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770 copies1 = pathcopies(base, c1) |
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771 copies2 = pathcopies(base, c2) |
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772 |
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773 if not (copies1 or copies2): |
44200
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774 return branch_copies(), branch_copies(), {} |
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|
775 |
42222
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776 inversecopies1 = {} |
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777 inversecopies2 = {} |
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778 for dst, src in copies1.items(): |
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779 inversecopies1.setdefault(src, []).append(dst) |
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780 for dst, src in copies2.items(): |
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781 inversecopies2.setdefault(src, []).append(dst) |
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782 |
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783 copy1 = {} |
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|
784 copy2 = {} |
42222
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785 diverge = {} |
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786 renamedelete1 = {} |
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|
787 renamedelete2 = {} |
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|
788 allsources = set(inversecopies1) | set(inversecopies2) |
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789 for src in allsources: |
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790 dsts1 = inversecopies1.get(src) |
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|
791 dsts2 = inversecopies2.get(src) |
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792 if dsts1 and dsts2: |
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|
793 # copied/renamed on both sides |
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794 if src not in m1 and src not in m2: |
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795 # renamed on both sides |
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796 dsts1 = set(dsts1) |
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|
797 dsts2 = set(dsts2) |
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|
798 # If there's some overlap in the rename destinations, we |
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|
799 # consider it not divergent. For example, if side 1 copies 'a' |
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800 # to 'b' and 'c' and deletes 'a', and side 2 copies 'a' to 'c' |
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801 # and 'd' and deletes 'a'. |
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|
802 if dsts1 & dsts2: |
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|
803 for dst in dsts1 & dsts2: |
44196
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|
804 copy1[dst] = src |
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|
805 copy2[dst] = src |
42222
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|
806 else: |
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|
807 diverge[src] = sorted(dsts1 | dsts2) |
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|
808 elif src in m1 and src in m2: |
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|
809 # copied on both sides |
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|
810 dsts1 = set(dsts1) |
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|
811 dsts2 = set(dsts2) |
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|
812 for dst in dsts1 & dsts2: |
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|
813 copy1[dst] = src |
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|
814 copy2[dst] = src |
42222
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|
815 # TODO: Handle cases where it was renamed on one side and copied |
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|
816 # on the other side |
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|
817 elif dsts1: |
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|
818 # copied/renamed only on side 1 |
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|
819 _checksinglesidecopies( |
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|
820 src, dsts1, m1, m2, mb, c2, base, copy1, renamedelete1 |
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|
821 ) |
42222
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|
822 elif dsts2: |
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823 # copied/renamed only on side 2 |
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824 _checksinglesidecopies( |
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|
825 src, dsts2, m2, m1, mb, c1, base, copy2, renamedelete2 |
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|
826 ) |
42222
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|
827 |
26659
df66736a128e
copies: group bothnew with other sets
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26658
diff
changeset
|
828 # find interesting file sets from manifests |
39966
707c3804e607
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|
829 addedinm1 = m1.filesnotin(mb, repo.narrowmatch()) |
707c3804e607
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|
830 addedinm2 = m2.filesnotin(mb, repo.narrowmatch()) |
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|
831 u1 = sorted(addedinm1 - addedinm2) |
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|
832 u2 = sorted(addedinm2 - addedinm1) |
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|
833 |
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|
834 header = b" unmatched files in %s" |
42223
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|
835 if u1: |
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|
836 repo.ui.debug(b"%s:\n %s\n" % (header % b'local', b"\n ".join(u1))) |
42223
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|
837 if u2: |
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|
838 repo.ui.debug(b"%s:\n %s\n" % (header % b'other', b"\n ".join(u2))) |
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|
839 |
42166
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|
840 if repo.ui.debugflag: |
44163
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|
841 renamedeleteset = set() |
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|
842 divergeset = set() |
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|
843 for dsts in diverge.values(): |
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|
844 divergeset.update(dsts) |
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|
845 for dsts in renamedelete1.values(): |
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846 renamedeleteset.update(dsts) |
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|
847 for dsts in renamedelete2.values(): |
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|
848 renamedeleteset.update(dsts) |
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849 |
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|
850 repo.ui.debug( |
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|
851 b" all copies found (* = to merge, ! = divergent, " |
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852 b"% = renamed and deleted):\n" |
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|
853 ) |
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854 for side, copies in ((b"local", copies1), (b"remote", copies2)): |
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|
855 if not copies: |
17e12938f8e7
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diff
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|
856 continue |
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|
857 repo.ui.debug(b" on %s side:\n" % side) |
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|
858 for f in sorted(copies): |
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|
859 note = b"" |
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|
860 if f in copy1 or f in copy2: |
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|
861 note += b"*" |
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862 if f in divergeset: |
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863 note += b"!" |
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864 if f in renamedeleteset: |
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865 note += b"%" |
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|
866 repo.ui.debug( |
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867 b" src: '%s' -> dst: '%s' %s\n" % (copies[f], f, note) |
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|
868 ) |
44163
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|
869 del renamedeleteset |
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|
870 del divergeset |
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871 |
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872 repo.ui.debug(b" checking for directory renames\n") |
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|
873 |
44196
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|
874 dirmove1, movewithdir2 = _dir_renames(repo, c1, copy1, copies1, u2) |
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875 dirmove2, movewithdir1 = _dir_renames(repo, c2, copy2, copies2, u1) |
44164
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|
876 |
44200
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Martin von Zweigbergk <martinvonz@google.com>
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diff
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|
877 branch_copies1 = branch_copies(copy1, renamedelete1, dirmove1, movewithdir1) |
fa9ad1da2e77
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diff
changeset
|
878 branch_copies2 = branch_copies(copy2, renamedelete2, dirmove2, movewithdir2) |
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879 |
44200
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|
880 return branch_copies1, branch_copies2, diverge |
44164
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881 |
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|
882 |
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883 def _dir_renames(repo, ctx, copy, fullcopy, addedfiles): |
6ca9f45b32b0
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|
884 """Finds moved directories and files that should move with them. |
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|
885 |
6ca9f45b32b0
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886 ctx: the context for one of the sides |
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887 copy: files copied on the same side (as ctx) |
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|
888 fullcopy: files copied on the same side (as ctx), including those that |
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|
889 merge.manifestmerge() won't care about |
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890 addedfiles: added files on the other side (compared to ctx) |
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891 """ |
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|
892 # generate a directory move map |
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893 d = ctx.dirs() |
17055
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Matt Mackall <mpm@selenic.com>
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diff
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|
894 invalid = set() |
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|
895 dirmove = {} |
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896 |
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|
897 # examine each file copy for a potential directory move, which is |
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|
898 # when all the files in a directory are moved to a new directory |
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|
899 for dst, src in pycompat.iteritems(fullcopy): |
25282
0f28815ef066
copies: switch to using pathutil.dirname
Durham Goode <durham@fb.com>
parents:
24782
diff
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|
900 dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst) |
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901 if dsrc in invalid: |
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|
902 # already seen to be uninteresting |
f3f383efbeae
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|
903 continue |
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904 elif dsrc in d and ddst in d: |
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|
905 # directory wasn't entirely moved locally |
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|
906 invalid.add(dsrc) |
eebd591803ab
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|
907 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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|
908 # files from the same directory moved to two different places |
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|
909 invalid.add(dsrc) |
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|
910 else: |
f3f383efbeae
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|
911 # looks good so far |
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|
912 dirmove[dsrc] = ddst |
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|
913 |
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|
914 for i in invalid: |
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|
915 if i in dirmove: |
f3f383efbeae
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diff
changeset
|
916 del dirmove[i] |
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|
917 del d, invalid |
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|
918 |
f3f383efbeae
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|
919 if not dirmove: |
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|
920 return {}, {} |
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diff
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|
921 |
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|
922 dirmove = {k + b"/": v + b"/" for k, v in pycompat.iteritems(dirmove)} |
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|
923 |
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|
924 for d in dirmove: |
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|
925 repo.ui.debug( |
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|
926 b" discovered dir src: '%s' -> dst: '%s'\n" % (d, dirmove[d]) |
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|
927 ) |
6274
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diff
changeset
|
928 |
30183
0106f93ca1d5
checkcopies: move 'movewithdir' initialisation right before its usage
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
30138
diff
changeset
|
929 movewithdir = {} |
6274
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|
930 # check unaccounted nonoverlapping files against directory moves |
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|
931 for f in addedfiles: |
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|
932 if f not in fullcopy: |
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|
933 for d in dirmove: |
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diff
changeset
|
934 if f.startswith(d): |
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|
935 # new file added in a directory that was moved, move it |
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|
936 df = dirmove[d] + f[len(d) :] |
6426
e2c49ef2dd6e
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parents:
6425
diff
changeset
|
937 if df not in copy: |
18134
6c35b53cd28b
copies: separate moves via directory renames from explicit copies
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parents:
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diff
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|
938 movewithdir[f] = df |
43076
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|
939 repo.ui.debug( |
43117
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diff
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|
940 b" pending file src: '%s' -> dst: '%s'\n" |
43076
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|
941 % (f, df) |
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|
942 ) |
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|
943 break |
f3f383efbeae
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|
944 |
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|
945 return dirmove, movewithdir |
19178
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copies: refactor checkcopies() into a top level method
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parents:
18899
diff
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|
946 |
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|
947 |
34179
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|
948 def _heuristicscopytracing(repo, c1, c2, base): |
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|
949 """ Fast copytracing using filename heuristics |
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|
950 |
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|
951 Assumes that moves or renames are of following two types: |
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|
952 |
036d47d7cf39
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|
953 1) Inside a directory only (same directory name but different filenames) |
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|
954 2) Move from one directory to another |
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|
955 (same filenames but different directory names) |
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|
956 |
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|
957 Works only when there are no merge commits in the "source branch". |
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|
958 Source branch is commits from base up to c2 not including base. |
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|
959 |
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|
960 If merge is involved it fallbacks to _fullcopytracing(). |
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|
961 |
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|
962 Can be used by setting the following config: |
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|
963 |
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|
964 [experimental] |
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|
965 copytrace = heuristics |
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966 |
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967 In some cases the copy/move candidates found by heuristics can be very large |
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968 in number and that will make the algorithm slow. The number of possible |
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969 candidates to check can be limited by using the config |
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970 `experimental.copytrace.movecandidateslimit` which defaults to 100. |
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971 """ |
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972 |
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973 if c1.rev() is None: |
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974 c1 = c1.p1() |
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975 if c2.rev() is None: |
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976 c2 = c2.p1() |
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977 |
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978 changedfiles = set() |
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979 m1 = c1.manifest() |
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980 if not repo.revs(b'%d::%d', base.rev(), c2.rev()): |
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981 # If base is not in c2 branch, we switch to fullcopytracing |
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982 repo.ui.debug( |
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983 b"switching to full copytracing as base is not " |
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984 b"an ancestor of c2\n" |
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985 ) |
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986 return _fullcopytracing(repo, c1, c2, base) |
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987 |
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988 ctx = c2 |
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989 while ctx != base: |
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990 if len(ctx.parents()) == 2: |
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991 # To keep things simple let's not handle merges |
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992 repo.ui.debug(b"switching to full copytracing because of merges\n") |
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993 return _fullcopytracing(repo, c1, c2, base) |
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994 changedfiles.update(ctx.files()) |
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995 ctx = ctx.p1() |
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996 |
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997 copies2 = {} |
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998 cp = _forwardcopies(base, c2) |
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999 for dst, src in pycompat.iteritems(cp): |
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1000 if src in m1: |
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1001 copies2[dst] = src |
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1002 |
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1003 # file is missing if it isn't present in the destination, but is present in |
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1004 # the base and present in the source. |
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1005 # Presence in the base is important to exclude added files, presence in the |
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1006 # source is important to exclude removed files. |
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1007 filt = lambda f: f not in m1 and f in base and f in c2 |
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1008 missingfiles = [f for f in changedfiles if filt(f)] |
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1009 |
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1010 copies1 = {} |
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1011 if missingfiles: |
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1012 basenametofilename = collections.defaultdict(list) |
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1013 dirnametofilename = collections.defaultdict(list) |
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1014 |
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1015 for f in m1.filesnotin(base.manifest()): |
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1016 basename = os.path.basename(f) |
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1017 dirname = os.path.dirname(f) |
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1018 basenametofilename[basename].append(f) |
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1019 dirnametofilename[dirname].append(f) |
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1020 |
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1021 for f in missingfiles: |
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1022 basename = os.path.basename(f) |
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1023 dirname = os.path.dirname(f) |
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1024 samebasename = basenametofilename[basename] |
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1025 samedirname = dirnametofilename[dirname] |
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1026 movecandidates = samebasename + samedirname |
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1027 # f is guaranteed to be present in c2, that's why |
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1028 # c2.filectx(f) won't fail |
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1029 f2 = c2.filectx(f) |
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1030 # we can have a lot of candidates which can slow down the heuristics |
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1031 # config value to limit the number of candidates moves to check |
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1032 maxcandidates = repo.ui.configint( |
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1033 b'experimental', b'copytrace.movecandidateslimit' |
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1034 ) |
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1035 |
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1036 if len(movecandidates) > maxcandidates: |
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1037 repo.ui.status( |
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1038 _( |
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1039 b"skipping copytracing for '%s', more " |
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1040 b"candidates than the limit: %d\n" |
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1041 ) |
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1042 % (f, len(movecandidates)) |
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1043 ) |
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1044 continue |
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1045 |
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1046 for candidate in movecandidates: |
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1047 f1 = c1.filectx(candidate) |
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1048 if _related(f1, f2): |
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1049 # if there are a few related copies then we'll merge |
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1050 # changes into all of them. This matches the behaviour |
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1051 # of upstream copytracing |
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1052 copies1[candidate] = f |
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1053 |
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1054 return branch_copies(copies1), branch_copies(copies2), {} |
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1055 |
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1056 |
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1057 def _related(f1, f2): |
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1058 """return True if f1 and f2 filectx have a common ancestor |
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1059 |
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1060 Walk back to common ancestor to see if the two files originate |
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1061 from the same file. Since workingfilectx's rev() is None it messes |
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1062 up the integer comparison logic, hence the pre-step check for |
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1063 None (f1 and f2 can only be workingfilectx's initially). |
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1064 """ |
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1065 |
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1066 if f1 == f2: |
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1067 return True # a match |
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1068 |
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1069 g1, g2 = f1.ancestors(), f2.ancestors() |
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1070 try: |
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1071 f1r, f2r = f1.linkrev(), f2.linkrev() |
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1072 |
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1073 if f1r is None: |
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1074 f1 = next(g1) |
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1075 if f2r is None: |
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1076 f2 = next(g2) |
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1077 |
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1078 while True: |
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1079 f1r, f2r = f1.linkrev(), f2.linkrev() |
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1080 if f1r > f2r: |
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1081 f1 = next(g1) |
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1082 elif f2r > f1r: |
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1083 f2 = next(g2) |
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1084 else: # f1 and f2 point to files in the same linkrev |
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1085 return f1 == f2 # true if they point to the same file |
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1086 except StopIteration: |
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1087 return False |
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1088 |
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1089 |
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1090 def graftcopies(wctx, ctx, base): |
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1091 """reproduce copies between base and ctx in the wctx |
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1092 |
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1093 Unlike mergecopies(), this function will only consider copies between base |
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1094 and ctx; it will ignore copies between base and wctx. Also unlike |
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1095 mergecopies(), this function will apply copies to the working copy (instead |
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1096 of just returning information about the copies). That makes it cheaper |
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1097 (especially in the common case of base==ctx.p1()) and useful also when |
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1098 experimental.copytrace=off. |
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1099 |
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1100 merge.update() will have already marked most copies, but it will only |
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1101 mark copies if it thinks the source files are related (see |
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1102 merge._related()). It will also not mark copies if the file wasn't modified |
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1103 on the local side. This function adds the copies that were "missed" |
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1104 by merge.update(). |
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1105 """ |
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1106 new_copies = pathcopies(base, ctx) |
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1107 _filter(wctx.p1(), wctx, new_copies) |
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1108 for dst, src in pycompat.iteritems(new_copies): |
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1109 wctx[dst].markcopied(src) |