Mercurial > hg
annotate mercurial/copies.py @ 45637:ad6ebb6f0dfe
copies: make two version of the changeset centric algorithm
They are two main ways to run the changeset-centric copy-tracing algorithm. One
fed from data stored in side-data and still in development, and one based on
data stored in extra (with a "compatibility" mode).
The `extra` based is used in production at Google, but still experimental in
code. It is mostly unsuitable for other users because it affects the hash.
The side-data based storage and algorithm have been evolving to store more data, cover more cases
(mostly around merge, that Google do not really care about) and use lower level
storage for efficiency.
All this changes make is increasingly hard to maintain de common code base,
without impacting code complexity and performance. For example, the
compatibility mode requires to keep things at different level than what we
need for side-data.
So, I am duplicating the involved functions. The newly added `_extra` variants
will be kept as today, while I will do some deeper rework of the side data
versions.
Long terms, the side-data version should be more featureful and performant than
the extra based version, so I expect the duplicated `_extra` functions to
eventually get dropped.
Differential Revision: https://phab.mercurial-scm.org/D9114
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 25 Sep 2020 14:39:04 +0200 |
parents | fb000408bca5 |
children | 4f876e6b30fa |
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 .revlogutils.flagutil import REVIDX_SIDEDATA |
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17 |
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18 from . import ( |
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19 match as matchmod, |
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20 node, |
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21 pathutil, |
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22 pycompat, |
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23 util, |
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24 ) |
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25 |
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26 |
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27 from .utils import stringutil |
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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 """return a function that return multiple data given a <rev>"i |
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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 * p1copies: mapping of copies from p1 |
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181 * p2copies: mapping of copies from p2 |
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182 * removed: a list of removed files |
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183 * ismerged: a callback to know if file was merged in that revision |
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184 """ |
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185 cl = repo.changelog |
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186 parents = cl.parentrevs |
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187 |
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188 def get_ismerged(rev): |
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189 ctx = repo[rev] |
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190 |
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191 def ismerged(path): |
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192 if path not in ctx.files(): |
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193 return False |
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194 fctx = ctx[path] |
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195 parents = fctx._filelog.parents(fctx._filenode) |
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196 nb_parents = 0 |
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197 for n in parents: |
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198 if n != node.nullid: |
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199 nb_parents += 1 |
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200 return nb_parents >= 2 |
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201 |
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202 return ismerged |
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203 |
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204 if repo.filecopiesmode == b'changeset-sidedata': |
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205 changelogrevision = cl.changelogrevision |
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206 flags = cl.flags |
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207 |
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208 # A small cache to avoid doing the work twice for merges |
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209 # |
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210 # In the vast majority of cases, if we ask information for a revision |
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211 # about 1 parent, we'll later ask it for the other. So it make sense to |
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212 # keep the information around when reaching the first parent of a merge |
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213 # and dropping it after it was provided for the second parents. |
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214 # |
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215 # It exists cases were only one parent of the merge will be walked. It |
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216 # happens when the "destination" the copy tracing is descendant from a |
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217 # new root, not common with the "source". In that case, we will only walk |
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218 # through merge parents that are descendant of changesets common |
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219 # between "source" and "destination". |
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220 # |
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221 # With the current case implementation if such changesets have a copy |
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222 # information, we'll keep them in memory until the end of |
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223 # _changesetforwardcopies. We don't expect the case to be frequent |
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224 # enough to matters. |
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225 # |
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226 # In addition, it would be possible to reach pathological case, were |
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227 # many first parent are met before any second parent is reached. In |
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228 # that case the cache could grow. If this even become an issue one can |
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229 # safely introduce a maximum cache size. This would trade extra CPU/IO |
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230 # time to save memory. |
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231 merge_caches = {} |
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232 |
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233 def revinfo(rev): |
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234 p1, p2 = parents(rev) |
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235 value = None |
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236 if flags(rev) & REVIDX_SIDEDATA: |
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237 e = merge_caches.pop(rev, None) |
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238 if e is not None: |
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239 return e |
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240 c = changelogrevision(rev) |
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241 p1copies = c.p1copies |
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242 p2copies = c.p2copies |
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243 removed = c.filesremoved |
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244 if p1 != node.nullrev and p2 != node.nullrev: |
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245 # XXX some case we over cache, IGNORE |
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246 value = merge_caches[rev] = ( |
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247 p1, |
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248 p2, |
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249 p1copies, |
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250 p2copies, |
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251 removed, |
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252 get_ismerged(rev), |
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253 ) |
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254 else: |
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255 p1copies = {} |
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256 p2copies = {} |
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257 removed = [] |
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258 |
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259 if value is None: |
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260 value = (p1, p2, p1copies, p2copies, removed, get_ismerged(rev)) |
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261 return value |
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262 |
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263 else: |
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264 |
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265 def revinfo(rev): |
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266 p1, p2 = parents(rev) |
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267 ctx = repo[rev] |
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268 p1copies, p2copies = ctx._copies |
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269 removed = ctx.filesremoved() |
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270 return p1, p2, p1copies, p2copies, removed, get_ismerged(rev) |
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271 |
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272 return revinfo |
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273 |
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274 |
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275 def _changesetforwardcopies(a, b, match): |
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276 if a.rev() in (node.nullrev, b.rev()): |
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277 return {} |
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278 |
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279 repo = a.repo().unfiltered() |
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280 children = {} |
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281 revinfo = _revinfo_getter(repo) |
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282 |
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283 cl = repo.changelog |
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284 isancestor = cl.isancestorrev # XXX we should had chaching to this. |
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285 missingrevs = cl.findmissingrevs(common=[a.rev()], heads=[b.rev()]) |
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286 mrset = set(missingrevs) |
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287 roots = set() |
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288 for r in missingrevs: |
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289 for p in cl.parentrevs(r): |
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290 if p == node.nullrev: |
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291 continue |
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292 if p not in children: |
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293 children[p] = [r] |
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294 else: |
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295 children[p].append(r) |
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296 if p not in mrset: |
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297 roots.add(p) |
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298 if not roots: |
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299 # no common revision to track copies from |
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300 return {} |
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301 min_root = min(roots) |
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302 |
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303 from_head = set( |
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304 cl.reachableroots(min_root, [b.rev()], list(roots), includepath=True) |
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305 ) |
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306 |
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307 iterrevs = set(from_head) |
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308 iterrevs &= mrset |
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309 iterrevs.update(roots) |
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310 iterrevs.remove(b.rev()) |
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311 revs = sorted(iterrevs) |
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312 |
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313 if repo.filecopiesmode == b'changeset-sidedata': |
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314 return _combine_changeset_copies( |
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315 revs, children, b.rev(), revinfo, match, isancestor |
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316 ) |
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317 else: |
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318 return _combine_changeset_copies_extra( |
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319 revs, children, b.rev(), revinfo, match, isancestor |
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320 ) |
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321 |
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322 |
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323 def _combine_changeset_copies( |
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324 revs, children, targetrev, revinfo, match, isancestor |
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325 ): |
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326 """combine the copies information for each item of iterrevs |
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327 |
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328 revs: sorted iterable of revision to visit |
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329 children: a {parent: [children]} mapping. |
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330 targetrev: the final copies destination revision (not in iterrevs) |
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331 revinfo(rev): a function that return (p1, p2, p1copies, p2copies, removed) |
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332 match: a matcher |
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333 |
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334 It returns the aggregated copies information for `targetrev`. |
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335 """ |
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336 all_copies = {} |
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337 alwaysmatch = match.always() |
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338 for r in revs: |
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339 copies = all_copies.pop(r, None) |
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340 if copies is None: |
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341 # this is a root |
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342 copies = {} |
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343 for i, c in enumerate(children[r]): |
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344 p1, p2, p1copies, p2copies, removed, ismerged = revinfo(c) |
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345 if r == p1: |
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346 parent = 1 |
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347 childcopies = p1copies |
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348 else: |
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349 assert r == p2 |
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350 parent = 2 |
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351 childcopies = p2copies |
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352 if not alwaysmatch: |
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353 childcopies = { |
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354 dst: src for dst, src in childcopies.items() if match(dst) |
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355 } |
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356 newcopies = copies |
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357 if childcopies: |
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358 newcopies = copies.copy() |
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359 for dest, source in pycompat.iteritems(childcopies): |
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360 prev = copies.get(source) |
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361 if prev is not None and prev[1] is not None: |
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362 source = prev[1] |
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363 newcopies[dest] = (c, source) |
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364 assert newcopies is not copies |
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365 for f in removed: |
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366 if f in newcopies: |
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367 if newcopies is copies: |
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368 # copy on write to avoid affecting potential other |
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369 # branches. when there are no other branches, this |
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370 # could be avoided. |
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371 newcopies = copies.copy() |
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372 newcopies[f] = (c, None) |
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373 othercopies = all_copies.get(c) |
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374 if othercopies is None: |
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375 all_copies[c] = newcopies |
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376 else: |
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377 # we are the second parent to work on c, we need to merge our |
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378 # work with the other. |
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379 # |
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380 # In case of conflict, parent 1 take precedence over parent 2. |
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381 # This is an arbitrary choice made anew when implementing |
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382 # changeset based copies. It was made without regards with |
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383 # potential filelog related behavior. |
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384 if parent == 1: |
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385 _merge_copies_dict( |
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386 othercopies, newcopies, isancestor, ismerged |
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387 ) |
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388 else: |
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389 _merge_copies_dict( |
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390 newcopies, othercopies, isancestor, ismerged |
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391 ) |
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392 all_copies[c] = newcopies |
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393 |
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394 final_copies = {} |
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395 for dest, (tt, source) in all_copies[targetrev].items(): |
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396 if source is not None: |
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397 final_copies[dest] = source |
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398 return final_copies |
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399 |
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400 |
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401 def _merge_copies_dict(minor, major, isancestor, ismerged): |
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402 """merge two copies-mapping together, minor and major |
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403 |
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404 In case of conflict, value from "major" will be picked. |
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405 |
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406 - `isancestors(low_rev, high_rev)`: callable return True if `low_rev` is an |
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407 ancestors of `high_rev`, |
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408 |
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409 - `ismerged(path)`: callable return True if `path` have been merged in the |
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410 current revision, |
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411 """ |
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412 for dest, value in major.items(): |
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413 other = minor.get(dest) |
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414 if other is None: |
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415 minor[dest] = value |
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416 else: |
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417 new_tt = value[0] |
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418 other_tt = other[0] |
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419 if value[1] == other[1]: |
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420 continue |
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421 # content from "major" wins, unless it is older |
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422 # than the branch point or there is a merge |
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423 if ( |
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424 new_tt == other_tt |
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425 or not isancestor(new_tt, other_tt) |
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426 or ismerged(dest) |
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427 ): |
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428 minor[dest] = value |
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429 |
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430 |
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431 def _combine_changeset_copies_extra( |
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432 revs, children, targetrev, revinfo, match, isancestor |
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433 ): |
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434 """version of `_combine_changeset_copies` that works with the Google |
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435 specific "extra" based storage for copy information""" |
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436 all_copies = {} |
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437 alwaysmatch = match.always() |
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438 for r in revs: |
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439 copies = all_copies.pop(r, None) |
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440 if copies is None: |
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441 # this is a root |
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442 copies = {} |
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443 for i, c in enumerate(children[r]): |
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444 p1, p2, p1copies, p2copies, removed, ismerged = revinfo(c) |
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445 if r == p1: |
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446 parent = 1 |
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447 childcopies = p1copies |
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448 else: |
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449 assert r == p2 |
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450 parent = 2 |
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451 childcopies = p2copies |
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452 if not alwaysmatch: |
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453 childcopies = { |
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454 dst: src for dst, src in childcopies.items() if match(dst) |
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455 } |
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456 newcopies = copies |
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457 if childcopies: |
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458 newcopies = copies.copy() |
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459 for dest, source in pycompat.iteritems(childcopies): |
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460 prev = copies.get(source) |
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461 if prev is not None and prev[1] is not None: |
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462 source = prev[1] |
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463 newcopies[dest] = (c, source) |
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464 assert newcopies is not copies |
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465 for f in removed: |
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466 if f in newcopies: |
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467 if newcopies is copies: |
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468 # copy on write to avoid affecting potential other |
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469 # branches. when there are no other branches, this |
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470 # could be avoided. |
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471 newcopies = copies.copy() |
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472 newcopies[f] = (c, None) |
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473 othercopies = all_copies.get(c) |
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474 if othercopies is None: |
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475 all_copies[c] = newcopies |
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476 else: |
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477 # we are the second parent to work on c, we need to merge our |
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478 # work with the other. |
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479 # |
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480 # In case of conflict, parent 1 take precedence over parent 2. |
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481 # This is an arbitrary choice made anew when implementing |
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482 # changeset based copies. It was made without regards with |
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483 # potential filelog related behavior. |
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484 if parent == 1: |
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485 _merge_copies_dict_extra( |
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486 othercopies, newcopies, isancestor, ismerged |
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487 ) |
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488 else: |
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489 _merge_copies_dict_extra( |
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490 newcopies, othercopies, isancestor, ismerged |
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491 ) |
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492 all_copies[c] = newcopies |
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493 |
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494 final_copies = {} |
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495 for dest, (tt, source) in all_copies[targetrev].items(): |
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496 if source is not None: |
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497 final_copies[dest] = source |
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498 return final_copies |
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499 |
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500 |
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501 def _merge_copies_dict_extra(minor, major, isancestor, ismerged): |
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502 """version of `_merge_copies_dict` that works with the Google |
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503 specific "extra" based storage for copy information""" |
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504 for dest, value in major.items(): |
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505 other = minor.get(dest) |
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506 if other is None: |
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507 minor[dest] = value |
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508 else: |
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509 new_tt = value[0] |
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510 other_tt = other[0] |
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511 if value[1] == other[1]: |
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512 continue |
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513 # content from "major" wins, unless it is older |
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514 # than the branch point or there is a merge |
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515 if ( |
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516 new_tt == other_tt |
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517 or not isancestor(new_tt, other_tt) |
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518 or ismerged(dest) |
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519 ): |
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520 minor[dest] = value |
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521 |
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522 |
42595
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523 def _forwardcopies(a, b, base=None, match=None): |
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524 """find {dst@b: src@a} copy mapping where a is an ancestor of b""" |
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525 |
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526 if base is None: |
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527 base = a |
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528 match = a.repo().narrowmatch(match) |
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529 # check for working copy |
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530 if b.rev() is None: |
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531 cm = _committedforwardcopies(a, b.p1(), base, match) |
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532 # combine copies from dirstate if necessary |
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533 copies = _chain(cm, _dirstatecopies(b._repo, match)) |
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534 else: |
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535 copies = _committedforwardcopies(a, b, base, match) |
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536 return copies |
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537 |
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538 |
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539 def _backwardrenames(a, b, match): |
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540 if a._repo.ui.config(b'experimental', b'copytrace') == b'off': |
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541 return {} |
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542 |
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543 # Even though we're not taking copies into account, 1:n rename situations |
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544 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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545 # arbitrarily pick one of the renames. |
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546 # We don't want to pass in "match" here, since that would filter |
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547 # the destination by it. Since we're reversing the copies, we want |
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548 # to filter the source instead. |
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549 f = _forwardcopies(b, a) |
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550 r = {} |
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551 for k, v in sorted(pycompat.iteritems(f)): |
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552 if match and not match(v): |
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553 continue |
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554 # remove copies |
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555 if v in a: |
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556 continue |
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557 r[v] = k |
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558 return r |
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559 |
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560 |
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561 def pathcopies(x, y, match=None): |
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562 """find {dst@y: src@x} copy mapping for directed compare""" |
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563 repo = x._repo |
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564 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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565 if debug: |
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566 repo.ui.debug( |
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567 b'debug.copies: searching copies from %s to %s\n' % (x, y) |
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568 ) |
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569 if x == y or not x or not y: |
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570 return {} |
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571 if y.rev() is None and x == y.p1(): |
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572 if debug: |
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573 repo.ui.debug(b'debug.copies: search mode: dirstate\n') |
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574 # short-circuit to avoid issues with merge states |
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575 return _dirstatecopies(repo, match) |
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576 a = y.ancestor(x) |
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577 if a == x: |
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578 if debug: |
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579 repo.ui.debug(b'debug.copies: search mode: forward\n') |
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580 copies = _forwardcopies(x, y, match=match) |
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581 elif a == y: |
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582 if debug: |
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583 repo.ui.debug(b'debug.copies: search mode: backward\n') |
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584 copies = _backwardrenames(x, y, match=match) |
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585 else: |
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586 if debug: |
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587 repo.ui.debug(b'debug.copies: search mode: combined\n') |
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588 base = None |
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589 if a.rev() != node.nullrev: |
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590 base = x |
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591 copies = _chain( |
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592 _backwardrenames(x, a, match=match), |
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593 _forwardcopies(a, y, base, match=match), |
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594 ) |
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595 _filter(x, y, copies) |
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596 return copies |
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597 |
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598 |
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599 def mergecopies(repo, c1, c2, base): |
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600 """ |
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|
601 Finds moves and copies between context c1 and c2 that are relevant for |
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602 merging. 'base' will be used as the merge base. |
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603 |
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604 Copytracing is used in commands like rebase, merge, unshelve, etc to merge |
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605 files that were moved/ copied in one merge parent and modified in another. |
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606 For example: |
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607 |
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608 o ---> 4 another commit |
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609 | |
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610 | o ---> 3 commit that modifies a.txt |
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611 | / |
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612 o / ---> 2 commit that moves a.txt to b.txt |
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613 |/ |
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614 o ---> 1 merge base |
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615 |
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616 If we try to rebase revision 3 on revision 4, since there is no a.txt in |
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617 revision 4, and if user have copytrace disabled, we prints the following |
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618 message: |
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619 |
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620 ```other changed <file> which local deleted``` |
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621 |
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622 Returns a tuple where: |
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623 |
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624 "branch_copies" an instance of branch_copies. |
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625 |
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626 "diverge" is a mapping of source name -> list of destination names |
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627 for divergent renames. |
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628 |
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629 This function calls different copytracing algorithms based on config. |
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630 """ |
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631 # avoid silly behavior for update from empty dir |
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632 if not c1 or not c2 or c1 == c2: |
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633 return branch_copies(), branch_copies(), {} |
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634 |
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635 narrowmatch = c1.repo().narrowmatch() |
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636 |
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|
637 # avoid silly behavior for parent -> working dir |
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638 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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639 return ( |
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640 branch_copies(_dirstatecopies(repo, narrowmatch)), |
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641 branch_copies(), |
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642 {}, |
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643 ) |
6646
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644 |
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645 copytracing = repo.ui.config(b'experimental', b'copytrace') |
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646 if stringutil.parsebool(copytracing) is False: |
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647 # stringutil.parsebool() returns None when it is unable to parse the |
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648 # value, so we should rely on making sure copytracing is on such cases |
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649 return branch_copies(), branch_copies(), {} |
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650 |
42226
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651 if usechangesetcentricalgo(repo): |
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652 # The heuristics don't make sense when we need changeset-centric algos |
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653 return _fullcopytracing(repo, c1, c2, base) |
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654 |
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655 # Copy trace disabling is explicitly below the node == p1 logic above |
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656 # because the logic above is required for a simple copy to be kept across a |
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657 # rebase. |
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658 if copytracing == b'heuristics': |
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659 # Do full copytracing if only non-public revisions are involved as |
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660 # that will be fast enough and will also cover the copies which could |
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661 # be missed by heuristics |
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662 if _isfullcopytraceable(repo, c1, base): |
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663 return _fullcopytracing(repo, c1, c2, base) |
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664 return _heuristicscopytracing(repo, c1, c2, base) |
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665 else: |
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666 return _fullcopytracing(repo, c1, c2, base) |
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667 |
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668 |
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669 def _isfullcopytraceable(repo, c1, base): |
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670 """ Checks that if base, source and destination are all no-public branches, |
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671 if yes let's use the full copytrace algorithm for increased capabilities |
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672 since it will be fast enough. |
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673 |
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674 `experimental.copytrace.sourcecommitlimit` can be used to set a limit for |
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675 number of changesets from c1 to base such that if number of changesets are |
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676 more than the limit, full copytracing algorithm won't be used. |
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677 """ |
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678 if c1.rev() is None: |
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679 c1 = c1.p1() |
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680 if c1.mutable() and base.mutable(): |
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681 sourcecommitlimit = repo.ui.configint( |
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682 b'experimental', b'copytrace.sourcecommitlimit' |
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683 ) |
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684 commits = len(repo.revs(b'%d::%d', base.rev(), c1.rev())) |
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685 return commits < sourcecommitlimit |
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686 return False |
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687 |
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688 |
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689 def _checksinglesidecopies( |
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690 src, dsts1, m1, m2, mb, c2, base, copy, renamedelete |
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|
691 ): |
42222
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|
692 if src not in m2: |
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693 # deleted on side 2 |
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694 if src not in m1: |
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|
695 # renamed on side 1, deleted on side 2 |
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|
696 renamedelete[src] = dsts1 |
44210
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697 elif src not in mb: |
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|
698 # Work around the "short-circuit to avoid issues with merge states" |
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699 # thing in pathcopies(): pathcopies(x, y) can return a copy where the |
d0c3eead515a
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|
700 # destination doesn't exist in y. |
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|
701 pass |
44909
d452acc8cce8
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Pierre-Yves David <pierre-yves.david@octobus.net>
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44276
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|
702 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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|
703 return |
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diff
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|
704 elif mb[src] != m2[src] or mb.flags(src) != m2.flags(src): |
42222
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|
705 # modified on side 2 |
57203e0210f8
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changeset
|
706 for dst in dsts1: |
44237
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44210
diff
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|
707 copy[dst] = src |
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|
708 |
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|
709 |
44199
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|
710 class branch_copies(object): |
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copies: define a type to return from mergecopies()
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|
711 """Information about copies made on one side of a merge/graft. |
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|
712 |
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|
713 "copy" is a mapping from destination name -> source name, |
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|
714 where source is in c1 and destination is in c2 or vice-versa. |
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|
715 |
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|
716 "movewithdir" is a mapping from source name -> destination name, |
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|
717 where the file at source present in one context but not the other |
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|
718 needs to be moved to destination by the merge process, because the |
7f8bdee0034e
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|
719 other context moved the directory it is in. |
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|
720 |
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|
721 "renamedelete" is a mapping of source name -> list of destination |
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|
722 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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|
723 |
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|
724 "dirmove" is a mapping of detected source dir -> destination dir renames. |
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|
725 This is needed for handling changes to new files previously grafted into |
7f8bdee0034e
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diff
changeset
|
726 renamed directories. |
7f8bdee0034e
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|
727 """ |
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changeset
|
728 |
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|
729 def __init__( |
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diff
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|
730 self, copy=None, renamedelete=None, dirmove=None, movewithdir=None |
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|
731 ): |
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|
732 self.copy = {} if copy is None else copy |
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diff
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|
733 self.renamedelete = {} if renamedelete is None else renamedelete |
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|
734 self.dirmove = {} if dirmove is None else dirmove |
7f8bdee0034e
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|
735 self.movewithdir = {} if movewithdir is None else movewithdir |
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|
736 |
44994
cfd06649a1b8
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|
737 def __repr__(self): |
cfd06649a1b8
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|
738 return ( |
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|
739 '<branch_copies\n copy=%r\n renamedelete=%r\n dirmove=%r\n movewithdir=%r\n>' |
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Martin von Zweigbergk <martinvonz@google.com>
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|
740 % (self.copy, self.renamedelete, self.dirmove, self.movewithdir,) |
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|
741 ) |
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|
742 |
44199
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|
743 |
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|
744 def _fullcopytracing(repo, c1, c2, base): |
b4b196092cc3
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745 """ The full copytracing algorithm which finds all the new files that were |
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|
746 added from merge base up to the top commit and for each file it checks if |
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|
747 this file was copied from another file. |
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748 |
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|
749 This is pretty slow when a lot of changesets are involved but will track all |
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|
750 the copies. |
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|
751 """ |
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|
752 m1 = c1.manifest() |
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diff
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|
753 m2 = c2.manifest() |
30186
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diff
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|
754 mb = base.manifest() |
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|
755 |
42222
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|
756 copies1 = pathcopies(base, c1) |
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|
757 copies2 = pathcopies(base, c2) |
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758 |
44162
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759 if not (copies1 or copies2): |
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760 return branch_copies(), branch_copies(), {} |
44162
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|
761 |
42222
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762 inversecopies1 = {} |
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763 inversecopies2 = {} |
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764 for dst, src in copies1.items(): |
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|
765 inversecopies1.setdefault(src, []).append(dst) |
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|
766 for dst, src in copies2.items(): |
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767 inversecopies2.setdefault(src, []).append(dst) |
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|
768 |
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|
769 copy1 = {} |
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|
770 copy2 = {} |
42222
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771 diverge = {} |
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772 renamedelete1 = {} |
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|
773 renamedelete2 = {} |
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774 allsources = set(inversecopies1) | set(inversecopies2) |
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|
775 for src in allsources: |
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776 dsts1 = inversecopies1.get(src) |
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777 dsts2 = inversecopies2.get(src) |
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778 if dsts1 and dsts2: |
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|
779 # copied/renamed on both sides |
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780 if src not in m1 and src not in m2: |
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|
781 # renamed on both sides |
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782 dsts1 = set(dsts1) |
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|
783 dsts2 = set(dsts2) |
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|
784 # If there's some overlap in the rename destinations, we |
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785 # consider it not divergent. For example, if side 1 copies 'a' |
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|
786 # to 'b' and 'c' and deletes 'a', and side 2 copies 'a' to 'c' |
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|
787 # and 'd' and deletes 'a'. |
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|
788 if dsts1 & dsts2: |
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|
789 for dst in dsts1 & dsts2: |
44196
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|
790 copy1[dst] = src |
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|
791 copy2[dst] = src |
42222
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792 else: |
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|
793 diverge[src] = sorted(dsts1 | dsts2) |
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794 elif src in m1 and src in m2: |
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|
795 # copied on both sides |
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|
796 dsts1 = set(dsts1) |
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797 dsts2 = set(dsts2) |
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|
798 for dst in dsts1 & dsts2: |
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|
799 copy1[dst] = src |
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|
800 copy2[dst] = src |
42222
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801 # TODO: Handle cases where it was renamed on one side and copied |
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|
802 # on the other side |
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|
803 elif dsts1: |
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|
804 # copied/renamed only on side 1 |
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|
805 _checksinglesidecopies( |
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|
806 src, dsts1, m1, m2, mb, c2, base, copy1, renamedelete1 |
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|
807 ) |
42222
57203e0210f8
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|
808 elif dsts2: |
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809 # copied/renamed only on side 2 |
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|
810 _checksinglesidecopies( |
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|
811 src, dsts2, m2, m1, mb, c1, base, copy2, renamedelete2 |
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|
812 ) |
42222
57203e0210f8
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|
813 |
26659
df66736a128e
copies: group bothnew with other sets
Matt Mackall <mpm@selenic.com>
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26658
diff
changeset
|
814 # find interesting file sets from manifests |
39966
707c3804e607
narrow: move copies overrides to core
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diff
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|
815 addedinm1 = m1.filesnotin(mb, repo.narrowmatch()) |
707c3804e607
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diff
changeset
|
816 addedinm2 = m2.filesnotin(mb, repo.narrowmatch()) |
42223
d69bc8ffbe6f
copies: inline _computenonoverlap() in mergecopies()
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42222
diff
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|
817 u1 = sorted(addedinm1 - addedinm2) |
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|
818 u2 = sorted(addedinm2 - addedinm1) |
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|
819 |
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|
820 header = b" unmatched files in %s" |
42223
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|
821 if u1: |
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|
822 repo.ui.debug(b"%s:\n %s\n" % (header % b'local', b"\n ".join(u1))) |
42223
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|
823 if u2: |
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|
824 repo.ui.debug(b"%s:\n %s\n" % (header % b'other', b"\n ".join(u2))) |
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|
825 |
42166
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copies: move early return for "no copies" case a little earlier
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diff
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|
826 if repo.ui.debugflag: |
44163
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|
827 renamedeleteset = set() |
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|
828 divergeset = set() |
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|
829 for dsts in diverge.values(): |
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|
830 divergeset.update(dsts) |
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|
831 for dsts in renamedelete1.values(): |
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|
832 renamedeleteset.update(dsts) |
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|
833 for dsts in renamedelete2.values(): |
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|
834 renamedeleteset.update(dsts) |
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|
835 |
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|
836 repo.ui.debug( |
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|
837 b" all copies found (* = to merge, ! = divergent, " |
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|
838 b"% = renamed and deleted):\n" |
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|
839 ) |
44197
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|
840 for side, copies in ((b"local", copies1), (b"remote", copies2)): |
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|
841 if not copies: |
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|
842 continue |
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changeset
|
843 repo.ui.debug(b" on %s side:\n" % side) |
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|
844 for f in sorted(copies): |
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|
845 note = b"" |
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changeset
|
846 if f in copy1 or f in copy2: |
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changeset
|
847 note += b"*" |
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|
848 if f in divergeset: |
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|
849 note += b"!" |
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|
850 if f in renamedeleteset: |
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changeset
|
851 note += b"%" |
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|
852 repo.ui.debug( |
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|
853 b" src: '%s' -> dst: '%s' %s\n" % (copies[f], f, note) |
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854 ) |
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855 del renamedeleteset |
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856 del divergeset |
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857 |
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858 repo.ui.debug(b" checking for directory renames\n") |
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859 |
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860 dirmove1, movewithdir2 = _dir_renames(repo, c1, copy1, copies1, u2) |
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861 dirmove2, movewithdir1 = _dir_renames(repo, c2, copy2, copies2, u1) |
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862 |
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863 branch_copies1 = branch_copies(copy1, renamedelete1, dirmove1, movewithdir1) |
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864 branch_copies2 = branch_copies(copy2, renamedelete2, dirmove2, movewithdir2) |
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865 |
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866 return branch_copies1, branch_copies2, diverge |
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867 |
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868 |
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869 def _dir_renames(repo, ctx, copy, fullcopy, addedfiles): |
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870 """Finds moved directories and files that should move with them. |
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871 |
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872 ctx: the context for one of the sides |
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873 copy: files copied on the same side (as ctx) |
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874 fullcopy: files copied on the same side (as ctx), including those that |
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875 merge.manifestmerge() won't care about |
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876 addedfiles: added files on the other side (compared to ctx) |
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877 """ |
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878 # generate a directory move map |
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879 d = ctx.dirs() |
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880 invalid = set() |
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881 dirmove = {} |
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882 |
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883 # examine each file copy for a potential directory move, which is |
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884 # when all the files in a directory are moved to a new directory |
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885 for dst, src in pycompat.iteritems(fullcopy): |
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886 dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst) |
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887 if dsrc in invalid: |
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888 # already seen to be uninteresting |
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889 continue |
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890 elif dsrc in d and ddst in d: |
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891 # directory wasn't entirely moved locally |
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892 invalid.add(dsrc) |
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893 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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894 # files from the same directory moved to two different places |
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895 invalid.add(dsrc) |
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896 else: |
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897 # looks good so far |
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898 dirmove[dsrc] = ddst |
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899 |
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900 for i in invalid: |
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901 if i in dirmove: |
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902 del dirmove[i] |
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903 del d, invalid |
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904 |
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905 if not dirmove: |
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906 return {}, {} |
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|
907 |
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908 dirmove = {k + b"/": v + b"/" for k, v in pycompat.iteritems(dirmove)} |
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909 |
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910 for d in dirmove: |
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|
911 repo.ui.debug( |
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|
912 b" discovered dir src: '%s' -> dst: '%s'\n" % (d, dirmove[d]) |
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913 ) |
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914 |
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diff
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|
915 movewithdir = {} |
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916 # check unaccounted nonoverlapping files against directory moves |
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917 for f in addedfiles: |
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918 if f not in fullcopy: |
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|
919 for d in dirmove: |
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|
920 if f.startswith(d): |
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921 # new file added in a directory that was moved, move it |
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|
922 df = dirmove[d] + f[len(d) :] |
6426
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diff
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923 if df not in copy: |
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924 movewithdir[f] = df |
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925 repo.ui.debug( |
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|
926 b" pending file src: '%s' -> dst: '%s'\n" |
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|
927 % (f, df) |
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|
928 ) |
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|
929 break |
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|
930 |
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|
931 return dirmove, movewithdir |
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|
932 |
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933 |
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934 def _heuristicscopytracing(repo, c1, c2, base): |
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935 """ Fast copytracing using filename heuristics |
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936 |
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937 Assumes that moves or renames are of following two types: |
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938 |
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939 1) Inside a directory only (same directory name but different filenames) |
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940 2) Move from one directory to another |
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941 (same filenames but different directory names) |
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942 |
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943 Works only when there are no merge commits in the "source branch". |
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944 Source branch is commits from base up to c2 not including base. |
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945 |
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946 If merge is involved it fallbacks to _fullcopytracing(). |
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947 |
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948 Can be used by setting the following config: |
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949 |
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950 [experimental] |
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951 copytrace = heuristics |
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952 |
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953 In some cases the copy/move candidates found by heuristics can be very large |
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954 in number and that will make the algorithm slow. The number of possible |
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955 candidates to check can be limited by using the config |
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956 `experimental.copytrace.movecandidateslimit` which defaults to 100. |
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957 """ |
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958 |
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959 if c1.rev() is None: |
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960 c1 = c1.p1() |
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961 if c2.rev() is None: |
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962 c2 = c2.p1() |
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963 |
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964 changedfiles = set() |
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965 m1 = c1.manifest() |
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|
966 if not repo.revs(b'%d::%d', base.rev(), c2.rev()): |
34179
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967 # If base is not in c2 branch, we switch to fullcopytracing |
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968 repo.ui.debug( |
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969 b"switching to full copytracing as base is not " |
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970 b"an ancestor of c2\n" |
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971 ) |
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972 return _fullcopytracing(repo, c1, c2, base) |
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973 |
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974 ctx = c2 |
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975 while ctx != base: |
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976 if len(ctx.parents()) == 2: |
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977 # To keep things simple let's not handle merges |
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978 repo.ui.debug(b"switching to full copytracing because of merges\n") |
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979 return _fullcopytracing(repo, c1, c2, base) |
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980 changedfiles.update(ctx.files()) |
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981 ctx = ctx.p1() |
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982 |
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983 copies2 = {} |
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984 cp = _forwardcopies(base, c2) |
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985 for dst, src in pycompat.iteritems(cp): |
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986 if src in m1: |
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987 copies2[dst] = src |
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988 |
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989 # file is missing if it isn't present in the destination, but is present in |
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990 # the base and present in the source. |
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991 # Presence in the base is important to exclude added files, presence in the |
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992 # source is important to exclude removed files. |
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993 filt = lambda f: f not in m1 and f in base and f in c2 |
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994 missingfiles = [f for f in changedfiles if filt(f)] |
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995 |
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996 copies1 = {} |
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997 if missingfiles: |
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998 basenametofilename = collections.defaultdict(list) |
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999 dirnametofilename = collections.defaultdict(list) |
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1000 |
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1001 for f in m1.filesnotin(base.manifest()): |
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1002 basename = os.path.basename(f) |
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1003 dirname = os.path.dirname(f) |
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1004 basenametofilename[basename].append(f) |
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1005 dirnametofilename[dirname].append(f) |
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1006 |
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1007 for f in missingfiles: |
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1008 basename = os.path.basename(f) |
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1009 dirname = os.path.dirname(f) |
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1010 samebasename = basenametofilename[basename] |
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1011 samedirname = dirnametofilename[dirname] |
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1012 movecandidates = samebasename + samedirname |
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1013 # f is guaranteed to be present in c2, that's why |
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1014 # c2.filectx(f) won't fail |
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1015 f2 = c2.filectx(f) |
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1016 # we can have a lot of candidates which can slow down the heuristics |
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1017 # config value to limit the number of candidates moves to check |
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1018 maxcandidates = repo.ui.configint( |
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1019 b'experimental', b'copytrace.movecandidateslimit' |
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1020 ) |
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1021 |
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1022 if len(movecandidates) > maxcandidates: |
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1023 repo.ui.status( |
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1024 _( |
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1025 b"skipping copytracing for '%s', more " |
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1026 b"candidates than the limit: %d\n" |
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1027 ) |
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1028 % (f, len(movecandidates)) |
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1029 ) |
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1030 continue |
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1031 |
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1032 for candidate in movecandidates: |
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1033 f1 = c1.filectx(candidate) |
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1034 if _related(f1, f2): |
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1035 # if there are a few related copies then we'll merge |
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1036 # changes into all of them. This matches the behaviour |
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1037 # of upstream copytracing |
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1038 copies1[candidate] = f |
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1039 |
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1040 return branch_copies(copies1), branch_copies(copies2), {} |
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1041 |
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1042 |
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1043 def _related(f1, f2): |
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1044 """return True if f1 and f2 filectx have a common ancestor |
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1045 |
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1046 Walk back to common ancestor to see if the two files originate |
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1047 from the same file. Since workingfilectx's rev() is None it messes |
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1048 up the integer comparison logic, hence the pre-step check for |
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1049 None (f1 and f2 can only be workingfilectx's initially). |
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1050 """ |
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1051 |
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1052 if f1 == f2: |
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1053 return True # a match |
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1054 |
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1055 g1, g2 = f1.ancestors(), f2.ancestors() |
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1056 try: |
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1057 f1r, f2r = f1.linkrev(), f2.linkrev() |
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1058 |
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1059 if f1r is None: |
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1060 f1 = next(g1) |
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1061 if f2r is None: |
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1062 f2 = next(g2) |
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1063 |
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1064 while True: |
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1065 f1r, f2r = f1.linkrev(), f2.linkrev() |
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1066 if f1r > f2r: |
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1067 f1 = next(g1) |
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1068 elif f2r > f1r: |
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1069 f2 = next(g2) |
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1070 else: # f1 and f2 point to files in the same linkrev |
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1071 return f1 == f2 # true if they point to the same file |
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1072 except StopIteration: |
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1073 return False |
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1074 |
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1075 |
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graftcopies: remove `skip` and `repo` arguments
Martin von Zweigbergk <martinvonz@google.com>
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1076 def graftcopies(wctx, ctx, base): |
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graftcopies: document why the function is useful at all
Martin von Zweigbergk <martinvonz@google.com>
parents:
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1077 """reproduce copies between base and ctx in the wctx |
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graftcopies: document why the function is useful at all
Martin von Zweigbergk <martinvonz@google.com>
parents:
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1078 |
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Martin von Zweigbergk <martinvonz@google.com>
parents:
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1079 Unlike mergecopies(), this function will only consider copies between base |
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Martin von Zweigbergk <martinvonz@google.com>
parents:
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1080 and ctx; it will ignore copies between base and wctx. Also unlike |
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graftcopies: document why the function is useful at all
Martin von Zweigbergk <martinvonz@google.com>
parents:
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1081 mergecopies(), this function will apply copies to the working copy (instead |
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graftcopies: document why the function is useful at all
Martin von Zweigbergk <martinvonz@google.com>
parents:
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1082 of just returning information about the copies). That makes it cheaper |
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graftcopies: document why the function is useful at all
Martin von Zweigbergk <martinvonz@google.com>
parents:
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1083 (especially in the common case of base==ctx.p1()) and useful also when |
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Martin von Zweigbergk <martinvonz@google.com>
parents:
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1084 experimental.copytrace=off. |
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Martin von Zweigbergk <martinvonz@google.com>
parents:
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1085 |
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Martin von Zweigbergk <martinvonz@google.com>
parents:
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1086 merge.update() will have already marked most copies, but it will only |
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graftcopies: document why the function is useful at all
Martin von Zweigbergk <martinvonz@google.com>
parents:
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1087 mark copies if it thinks the source files are related (see |
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Martin von Zweigbergk <martinvonz@google.com>
parents:
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1088 merge._related()). It will also not mark copies if the file wasn't modified |
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parents:
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1089 on the local side. This function adds the copies that were "missed" |
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Martin von Zweigbergk <martinvonz@google.com>
parents:
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1090 by merge.update(). |
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Martin von Zweigbergk <martinvonz@google.com>
parents:
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1091 """ |
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graftcopies: use _filter() for filtering out invalid copies
Martin von Zweigbergk <martinvonz@google.com>
parents:
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1092 new_copies = pathcopies(base, ctx) |
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Martin von Zweigbergk <martinvonz@google.com>
parents:
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1093 _filter(wctx.p1(), wctx, new_copies) |
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parents:
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1094 for dst, src in pycompat.iteritems(new_copies): |
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parents:
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1095 wctx[dst].markcopied(src) |