Mercurial > hg
annotate mercurial/copies.py @ 44196:6ca9f45b32b0
copies: make mergecopies() distinguish between copies on each side
I find it confusing that most of the dicts returned from
`mergecopies()` have entries specific to one branch of the merge, but
they're still combined into dict. For example, you can't tell if `copy
= {"bar": "foo"}` means that "foo" was copied to "bar" on the first
branch or the second.
It also feels like there are bugs lurking here because we may mistake
which side the copy happened on. However, for most of the dicts, it's
not possible that there is disagreement. For example, `renamedelete`
keeps track of renames that happened on one side of the merge where
the other side deleted the file. There can't be a disagreement there
(because we record that in the `diverge` dict instead). For regular
copies/renames, there can be a disagreement. Let's say file "foo" was
copied to "bar" on one branch and file "baz" was copied to "bar" on
the other. Beacause we only return one `copy` dict, we end up
replacing the `{"bar": "foo"}` entry by `{"bar": "baz"}`. The merge
code (`manifestmerge()`) will then decide that that means "both
renamed from 'baz'". We should probably treat it as a conflict
instead.
The next few patches will make `mergecopies()` return two instances of
most of the returned copies. That will lead to a bit more code (~40
lines), but I think it makes both `copies.mergecopies()` and
`merge.manifestmerge()` clearer.
Differential Revision: https://phab.mercurial-scm.org/D7986
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Wed, 22 Jan 2020 15:31:17 -0800 |
parents | 45192589555c |
children | 17e12938f8e7 |
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1 # copies.py - copy detection for Mercurial |
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2 # |
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3 # Copyright 2008 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import collections |
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11 import multiprocessing |
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12 import os |
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13 |
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14 from .i18n import _ |
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15 |
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16 |
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17 from .revlogutils.flagutil import REVIDX_SIDEDATA |
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18 |
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19 from . import ( |
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20 error, |
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21 match as matchmod, |
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22 node, |
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23 pathutil, |
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24 pycompat, |
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25 util, |
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26 ) |
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27 |
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28 from .revlogutils import sidedata as sidedatamod |
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29 |
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30 from .utils import stringutil |
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31 |
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32 |
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33 def _filter(src, dst, t): |
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34 """filters out invalid copies after chaining""" |
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35 |
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36 # When _chain()'ing copies in 'a' (from 'src' via some other commit 'mid') |
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37 # with copies in 'b' (from 'mid' to 'dst'), we can get the different cases |
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38 # in the following table (not including trivial cases). For example, case 2 |
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39 # is where a file existed in 'src' and remained under that name in 'mid' and |
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40 # then was renamed between 'mid' and 'dst'. |
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41 # |
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42 # case src mid dst result |
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43 # 1 x y - - |
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44 # 2 x y y x->y |
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45 # 3 x y x - |
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46 # 4 x y z x->z |
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47 # 5 - x y - |
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48 # 6 x x y x->y |
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49 # |
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50 # _chain() takes care of chaining the copies in 'a' and 'b', but it |
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51 # cannot tell the difference between cases 1 and 2, between 3 and 4, or |
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52 # between 5 and 6, so it includes all cases in its result. |
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53 # Cases 1, 3, and 5 are then removed by _filter(). |
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54 |
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55 for k, v in list(t.items()): |
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56 # remove copies from files that didn't exist |
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57 if v not in src: |
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58 del t[k] |
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59 # remove criss-crossed copies |
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60 elif k in src and v in dst: |
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61 del t[k] |
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62 # remove copies to files that were then removed |
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63 elif k not in dst: |
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64 del t[k] |
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65 |
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66 |
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67 def _chain(prefix, suffix): |
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68 """chain two sets of copies 'prefix' and 'suffix'""" |
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69 result = prefix.copy() |
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70 for key, value in pycompat.iteritems(suffix): |
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71 result[key] = prefix.get(value, value) |
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72 return result |
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73 |
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74 |
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75 def _tracefile(fctx, am, basemf): |
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76 """return file context that is the ancestor of fctx present in ancestor |
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77 manifest am |
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78 |
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79 Note: we used to try and stop after a given limit, however checking if that |
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80 limit is reached turned out to be very expensive. we are better off |
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81 disabling that feature.""" |
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82 |
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83 for f in fctx.ancestors(): |
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84 path = f.path() |
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85 if am.get(path, None) == f.filenode(): |
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86 return path |
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87 if basemf and basemf.get(path, None) == f.filenode(): |
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88 return path |
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89 |
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90 |
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91 def _dirstatecopies(repo, match=None): |
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92 ds = repo.dirstate |
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93 c = ds.copies().copy() |
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94 for k in list(c): |
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95 if ds[k] not in b'anm' or (match and not match(k)): |
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96 del c[k] |
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97 return c |
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98 |
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99 |
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100 def _computeforwardmissing(a, b, match=None): |
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101 """Computes which files are in b but not a. |
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102 This is its own function so extensions can easily wrap this call to see what |
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103 files _forwardcopies is about to process. |
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104 """ |
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105 ma = a.manifest() |
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106 mb = b.manifest() |
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107 return mb.filesnotin(ma, match=match) |
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108 |
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109 |
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110 def usechangesetcentricalgo(repo): |
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111 """Checks if we should use changeset-centric copy algorithms""" |
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112 if repo.filecopiesmode == b'changeset-sidedata': |
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113 return True |
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114 readfrom = repo.ui.config(b'experimental', b'copies.read-from') |
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115 changesetsource = (b'changeset-only', b'compatibility') |
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116 return readfrom in changesetsource |
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117 |
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118 |
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119 def _committedforwardcopies(a, b, base, match): |
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120 """Like _forwardcopies(), but b.rev() cannot be None (working copy)""" |
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121 # files might have to be traced back to the fctx parent of the last |
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122 # one-side-only changeset, but not further back than that |
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123 repo = a._repo |
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124 |
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125 if usechangesetcentricalgo(repo): |
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126 return _changesetforwardcopies(a, b, match) |
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127 |
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128 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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129 dbg = repo.ui.debug |
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130 if debug: |
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131 dbg(b'debug.copies: looking into rename from %s to %s\n' % (a, b)) |
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132 am = a.manifest() |
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133 basemf = None if base is None else base.manifest() |
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134 |
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135 # find where new files came from |
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136 # we currently don't try to find where old files went, too expensive |
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137 # this means we can miss a case like 'hg rm b; hg cp a b' |
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138 cm = {} |
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139 |
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140 # Computing the forward missing is quite expensive on large manifests, since |
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141 # it compares the entire manifests. We can optimize it in the common use |
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142 # case of computing what copies are in a commit versus its parent (like |
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143 # during a rebase or histedit). Note, we exclude merge commits from this |
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144 # optimization, since the ctx.files() for a merge commit is not correct for |
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145 # this comparison. |
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146 forwardmissingmatch = match |
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147 if b.p1() == a and b.p2().node() == node.nullid: |
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148 filesmatcher = matchmod.exact(b.files()) |
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149 forwardmissingmatch = matchmod.intersectmatchers(match, filesmatcher) |
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150 missing = _computeforwardmissing(a, b, match=forwardmissingmatch) |
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151 |
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152 ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) |
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153 |
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154 if debug: |
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155 dbg(b'debug.copies: missing files to search: %d\n' % len(missing)) |
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156 |
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157 for f in sorted(missing): |
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158 if debug: |
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159 dbg(b'debug.copies: tracing file: %s\n' % f) |
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160 fctx = b[f] |
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161 fctx._ancestrycontext = ancestrycontext |
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162 |
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163 if debug: |
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164 start = util.timer() |
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165 opath = _tracefile(fctx, am, basemf) |
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166 if opath: |
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167 if debug: |
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168 dbg(b'debug.copies: rename of: %s\n' % opath) |
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169 cm[f] = opath |
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170 if debug: |
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171 dbg( |
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172 b'debug.copies: time: %f seconds\n' |
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173 % (util.timer() - start) |
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174 ) |
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175 return cm |
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176 |
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177 |
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178 def _revinfogetter(repo): |
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179 """return a function that return multiple data given a <rev>"i |
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180 |
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181 * p1: revision number of first parent |
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182 * p2: revision number of first parent |
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183 * p1copies: mapping of copies from p1 |
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184 * p2copies: mapping of copies from p2 |
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185 * removed: a list of removed files |
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186 """ |
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187 cl = repo.changelog |
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188 parents = cl.parentrevs |
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189 |
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190 if repo.filecopiesmode == b'changeset-sidedata': |
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191 changelogrevision = cl.changelogrevision |
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192 flags = cl.flags |
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193 |
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194 # A small cache to avoid doing the work twice for merges |
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195 # |
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196 # In the vast majority of cases, if we ask information for a revision |
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197 # about 1 parent, we'll later ask it for the other. So it make sense to |
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198 # keep the information around when reaching the first parent of a merge |
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199 # and dropping it after it was provided for the second parents. |
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200 # |
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201 # It exists cases were only one parent of the merge will be walked. It |
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202 # happens when the "destination" the copy tracing is descendant from a |
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203 # new root, not common with the "source". In that case, we will only walk |
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204 # through merge parents that are descendant of changesets common |
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205 # between "source" and "destination". |
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206 # |
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207 # With the current case implementation if such changesets have a copy |
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208 # information, we'll keep them in memory until the end of |
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209 # _changesetforwardcopies. We don't expect the case to be frequent |
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210 # enough to matters. |
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211 # |
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212 # In addition, it would be possible to reach pathological case, were |
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213 # many first parent are met before any second parent is reached. In |
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214 # that case the cache could grow. If this even become an issue one can |
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215 # safely introduce a maximum cache size. This would trade extra CPU/IO |
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216 # time to save memory. |
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217 merge_caches = {} |
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218 |
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219 def revinfo(rev): |
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220 p1, p2 = parents(rev) |
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221 if flags(rev) & REVIDX_SIDEDATA: |
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222 e = merge_caches.pop(rev, None) |
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223 if e is not None: |
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224 return e |
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225 c = changelogrevision(rev) |
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226 p1copies = c.p1copies |
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227 p2copies = c.p2copies |
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228 removed = c.filesremoved |
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229 if p1 != node.nullrev and p2 != node.nullrev: |
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230 # XXX some case we over cache, IGNORE |
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231 merge_caches[rev] = (p1, p2, p1copies, p2copies, removed) |
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232 else: |
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233 p1copies = {} |
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234 p2copies = {} |
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235 removed = [] |
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236 return p1, p2, p1copies, p2copies, removed |
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237 |
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238 else: |
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239 |
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240 def revinfo(rev): |
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241 p1, p2 = parents(rev) |
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242 ctx = repo[rev] |
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243 p1copies, p2copies = ctx._copies |
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244 removed = ctx.filesremoved() |
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245 return p1, p2, p1copies, p2copies, removed |
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246 |
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247 return revinfo |
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248 |
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249 |
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250 def _changesetforwardcopies(a, b, match): |
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251 if a.rev() in (node.nullrev, b.rev()): |
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252 return {} |
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253 |
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254 repo = a.repo().unfiltered() |
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255 children = {} |
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256 revinfo = _revinfogetter(repo) |
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257 |
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258 cl = repo.changelog |
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259 missingrevs = cl.findmissingrevs(common=[a.rev()], heads=[b.rev()]) |
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260 mrset = set(missingrevs) |
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261 roots = set() |
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262 for r in missingrevs: |
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263 for p in cl.parentrevs(r): |
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264 if p == node.nullrev: |
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265 continue |
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266 if p not in children: |
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267 children[p] = [r] |
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268 else: |
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269 children[p].append(r) |
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270 if p not in mrset: |
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271 roots.add(p) |
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272 if not roots: |
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273 # no common revision to track copies from |
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274 return {} |
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275 min_root = min(roots) |
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276 |
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277 from_head = set( |
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278 cl.reachableroots(min_root, [b.rev()], list(roots), includepath=True) |
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279 ) |
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280 |
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281 iterrevs = set(from_head) |
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282 iterrevs &= mrset |
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283 iterrevs.update(roots) |
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284 iterrevs.remove(b.rev()) |
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285 revs = sorted(iterrevs) |
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286 return _combinechangesetcopies(revs, children, b.rev(), revinfo, match) |
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287 |
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288 |
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289 def _combinechangesetcopies(revs, children, targetrev, revinfo, match): |
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290 """combine the copies information for each item of iterrevs |
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291 |
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292 revs: sorted iterable of revision to visit |
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293 children: a {parent: [children]} mapping. |
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294 targetrev: the final copies destination revision (not in iterrevs) |
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295 revinfo(rev): a function that return (p1, p2, p1copies, p2copies, removed) |
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296 match: a matcher |
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297 |
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298 It returns the aggregated copies information for `targetrev`. |
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299 """ |
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300 all_copies = {} |
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301 alwaysmatch = match.always() |
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302 for r in revs: |
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303 copies = all_copies.pop(r, None) |
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304 if copies is None: |
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305 # this is a root |
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306 copies = {} |
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307 for i, c in enumerate(children[r]): |
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308 p1, p2, p1copies, p2copies, removed = revinfo(c) |
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309 if r == p1: |
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310 parent = 1 |
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311 childcopies = p1copies |
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312 else: |
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313 assert r == p2 |
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314 parent = 2 |
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315 childcopies = p2copies |
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316 if not alwaysmatch: |
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317 childcopies = { |
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318 dst: src for dst, src in childcopies.items() if match(dst) |
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319 } |
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320 newcopies = copies |
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321 if childcopies: |
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322 newcopies = _chain(newcopies, childcopies) |
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323 # _chain makes a copies, we can avoid doing so in some |
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324 # simple/linear cases. |
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325 assert newcopies is not copies |
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326 for f in removed: |
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327 if f in newcopies: |
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328 if newcopies is copies: |
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329 # copy on write to avoid affecting potential other |
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330 # branches. when there are no other branches, this |
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331 # could be avoided. |
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332 newcopies = copies.copy() |
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333 del newcopies[f] |
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334 othercopies = all_copies.get(c) |
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335 if othercopies is None: |
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336 all_copies[c] = newcopies |
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337 else: |
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338 # we are the second parent to work on c, we need to merge our |
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339 # work with the other. |
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340 # |
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341 # Unlike when copies are stored in the filelog, we consider |
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342 # it a copy even if the destination already existed on the |
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343 # other branch. It's simply too expensive to check if the |
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344 # file existed in the manifest. |
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345 # |
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346 # In case of conflict, parent 1 take precedence over parent 2. |
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347 # This is an arbitrary choice made anew when implementing |
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348 # changeset based copies. It was made without regards with |
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349 # potential filelog related behavior. |
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350 if parent == 1: |
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351 othercopies.update(newcopies) |
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352 else: |
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353 newcopies.update(othercopies) |
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354 all_copies[c] = newcopies |
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355 return all_copies[targetrev] |
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356 |
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357 |
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358 def _forwardcopies(a, b, base=None, match=None): |
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359 """find {dst@b: src@a} copy mapping where a is an ancestor of b""" |
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360 |
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361 if base is None: |
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362 base = a |
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363 match = a.repo().narrowmatch(match) |
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364 # check for working copy |
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365 if b.rev() is None: |
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366 cm = _committedforwardcopies(a, b.p1(), base, match) |
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367 # combine copies from dirstate if necessary |
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368 copies = _chain(cm, _dirstatecopies(b._repo, match)) |
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369 else: |
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370 copies = _committedforwardcopies(a, b, base, match) |
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371 return copies |
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372 |
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373 |
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374 def _backwardrenames(a, b, match): |
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375 if a._repo.ui.config(b'experimental', b'copytrace') == b'off': |
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376 return {} |
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377 |
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378 # Even though we're not taking copies into account, 1:n rename situations |
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379 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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380 # arbitrarily pick one of the renames. |
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381 # We don't want to pass in "match" here, since that would filter |
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382 # the destination by it. Since we're reversing the copies, we want |
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383 # to filter the source instead. |
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384 f = _forwardcopies(b, a) |
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385 r = {} |
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386 for k, v in sorted(pycompat.iteritems(f)): |
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387 if match and not match(v): |
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388 continue |
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389 # remove copies |
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390 if v in a: |
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391 continue |
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392 r[v] = k |
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393 return r |
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394 |
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395 |
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396 def pathcopies(x, y, match=None): |
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397 """find {dst@y: src@x} copy mapping for directed compare""" |
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398 repo = x._repo |
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399 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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400 if debug: |
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401 repo.ui.debug( |
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402 b'debug.copies: searching copies from %s to %s\n' % (x, y) |
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403 ) |
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404 if x == y or not x or not y: |
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405 return {} |
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406 a = y.ancestor(x) |
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407 if a == x: |
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408 if debug: |
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409 repo.ui.debug(b'debug.copies: search mode: forward\n') |
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410 if y.rev() is None and x == y.p1(): |
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411 # short-circuit to avoid issues with merge states |
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412 return _dirstatecopies(repo, match) |
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413 copies = _forwardcopies(x, y, match=match) |
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414 elif a == y: |
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415 if debug: |
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416 repo.ui.debug(b'debug.copies: search mode: backward\n') |
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417 copies = _backwardrenames(x, y, match=match) |
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418 else: |
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419 if debug: |
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420 repo.ui.debug(b'debug.copies: search mode: combined\n') |
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421 base = None |
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422 if a.rev() != node.nullrev: |
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423 base = x |
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424 copies = _chain( |
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425 _backwardrenames(x, a, match=match), |
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426 _forwardcopies(a, y, base, match=match), |
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427 ) |
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428 _filter(x, y, copies) |
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429 return copies |
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430 |
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431 |
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432 def mergecopies(repo, c1, c2, base): |
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433 """ |
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434 Finds moves and copies between context c1 and c2 that are relevant for |
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435 merging. 'base' will be used as the merge base. |
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436 |
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437 Copytracing is used in commands like rebase, merge, unshelve, etc to merge |
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438 files that were moved/ copied in one merge parent and modified in another. |
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439 For example: |
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440 |
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441 o ---> 4 another commit |
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442 | |
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443 | o ---> 3 commit that modifies a.txt |
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444 | / |
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445 o / ---> 2 commit that moves a.txt to b.txt |
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446 |/ |
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447 o ---> 1 merge base |
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448 |
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449 If we try to rebase revision 3 on revision 4, since there is no a.txt in |
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450 revision 4, and if user have copytrace disabled, we prints the following |
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451 message: |
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452 |
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453 ```other changed <file> which local deleted``` |
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454 |
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455 Returns five dicts: "copy", "movewithdir", "diverge", "renamedelete" and |
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456 "dirmove". |
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457 |
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458 "copy" is a mapping from destination name -> source name, |
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459 where source is in c1 and destination is in c2 or vice-versa. |
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460 |
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461 "movewithdir" is a mapping from source name -> destination name, |
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462 where the file at source present in one context but not the other |
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463 needs to be moved to destination by the merge process, because the |
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464 other context moved the directory it is in. |
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465 |
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466 "diverge" is a mapping of source name -> list of destination names |
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467 for divergent renames. |
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468 |
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469 "renamedelete" is a mapping of source name -> list of destination |
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470 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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471 |
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472 "dirmove" is a mapping of detected source dir -> destination dir renames. |
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473 This is needed for handling changes to new files previously grafted into |
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474 renamed directories. |
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475 |
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476 This function calls different copytracing algorithms based on config. |
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477 """ |
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478 # avoid silly behavior for update from empty dir |
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479 if not c1 or not c2 or c1 == c2: |
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480 return {}, {}, {}, {}, {} |
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481 |
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482 narrowmatch = c1.repo().narrowmatch() |
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483 |
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484 # avoid silly behavior for parent -> working dir |
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485 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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486 return _dirstatecopies(repo, narrowmatch), {}, {}, {}, {} |
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487 |
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488 copytracing = repo.ui.config(b'experimental', b'copytrace') |
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489 if stringutil.parsebool(copytracing) is False: |
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490 # stringutil.parsebool() returns None when it is unable to parse the |
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491 # value, so we should rely on making sure copytracing is on such cases |
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492 return {}, {}, {}, {}, {} |
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493 |
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494 if usechangesetcentricalgo(repo): |
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495 # The heuristics don't make sense when we need changeset-centric algos |
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496 return _fullcopytracing(repo, c1, c2, base) |
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497 |
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498 # Copy trace disabling is explicitly below the node == p1 logic above |
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499 # because the logic above is required for a simple copy to be kept across a |
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500 # rebase. |
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501 if copytracing == b'heuristics': |
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502 # Do full copytracing if only non-public revisions are involved as |
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503 # that will be fast enough and will also cover the copies which could |
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504 # be missed by heuristics |
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505 if _isfullcopytraceable(repo, c1, base): |
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506 return _fullcopytracing(repo, c1, c2, base) |
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507 return _heuristicscopytracing(repo, c1, c2, base) |
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508 else: |
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509 return _fullcopytracing(repo, c1, c2, base) |
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510 |
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511 |
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512 def _isfullcopytraceable(repo, c1, base): |
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513 """ Checks that if base, source and destination are all no-public branches, |
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514 if yes let's use the full copytrace algorithm for increased capabilities |
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515 since it will be fast enough. |
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516 |
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517 `experimental.copytrace.sourcecommitlimit` can be used to set a limit for |
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518 number of changesets from c1 to base such that if number of changesets are |
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519 more than the limit, full copytracing algorithm won't be used. |
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520 """ |
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521 if c1.rev() is None: |
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522 c1 = c1.p1() |
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523 if c1.mutable() and base.mutable(): |
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524 sourcecommitlimit = repo.ui.configint( |
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525 b'experimental', b'copytrace.sourcecommitlimit' |
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526 ) |
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527 commits = len(repo.revs(b'%d::%d', base.rev(), c1.rev())) |
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528 return commits < sourcecommitlimit |
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529 return False |
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530 |
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531 |
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532 def _checksinglesidecopies( |
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533 src, dsts1, m1, m2, mb, c2, base, copy, renamedelete |
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534 ): |
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535 if src not in m2: |
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536 # deleted on side 2 |
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537 if src not in m1: |
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538 # renamed on side 1, deleted on side 2 |
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539 renamedelete[src] = dsts1 |
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540 elif m2[src] != mb[src]: |
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541 if not _related(c2[src], base[src]): |
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542 return |
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543 # modified on side 2 |
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544 for dst in dsts1: |
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545 if dst not in m2: |
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546 # dst not added on side 2 (handle as regular |
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547 # "both created" case in manifestmerge otherwise) |
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548 copy[dst] = src |
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549 |
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550 |
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551 def _fullcopytracing(repo, c1, c2, base): |
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552 """ The full copytracing algorithm which finds all the new files that were |
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553 added from merge base up to the top commit and for each file it checks if |
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554 this file was copied from another file. |
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555 |
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556 This is pretty slow when a lot of changesets are involved but will track all |
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557 the copies. |
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558 """ |
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559 m1 = c1.manifest() |
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560 m2 = c2.manifest() |
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561 mb = base.manifest() |
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562 |
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563 copies1 = pathcopies(base, c1) |
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564 copies2 = pathcopies(base, c2) |
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565 |
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566 if not (copies1 or copies2): |
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567 return {}, {}, {}, {}, {} |
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568 |
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569 inversecopies1 = {} |
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570 inversecopies2 = {} |
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571 for dst, src in copies1.items(): |
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572 inversecopies1.setdefault(src, []).append(dst) |
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573 for dst, src in copies2.items(): |
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574 inversecopies2.setdefault(src, []).append(dst) |
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575 |
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576 copy1 = {} |
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577 copy2 = {} |
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578 diverge = {} |
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579 renamedelete1 = {} |
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580 renamedelete2 = {} |
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581 allsources = set(inversecopies1) | set(inversecopies2) |
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582 for src in allsources: |
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583 dsts1 = inversecopies1.get(src) |
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584 dsts2 = inversecopies2.get(src) |
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585 if dsts1 and dsts2: |
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586 # copied/renamed on both sides |
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587 if src not in m1 and src not in m2: |
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588 # renamed on both sides |
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589 dsts1 = set(dsts1) |
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590 dsts2 = set(dsts2) |
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591 # If there's some overlap in the rename destinations, we |
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592 # consider it not divergent. For example, if side 1 copies 'a' |
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593 # to 'b' and 'c' and deletes 'a', and side 2 copies 'a' to 'c' |
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594 # and 'd' and deletes 'a'. |
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595 if dsts1 & dsts2: |
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596 for dst in dsts1 & dsts2: |
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597 copy1[dst] = src |
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598 copy2[dst] = src |
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599 else: |
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600 diverge[src] = sorted(dsts1 | dsts2) |
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601 elif src in m1 and src in m2: |
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602 # copied on both sides |
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603 dsts1 = set(dsts1) |
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604 dsts2 = set(dsts2) |
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605 for dst in dsts1 & dsts2: |
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606 copy1[dst] = src |
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607 copy2[dst] = src |
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608 # TODO: Handle cases where it was renamed on one side and copied |
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609 # on the other side |
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610 elif dsts1: |
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611 # copied/renamed only on side 1 |
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612 _checksinglesidecopies( |
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613 src, dsts1, m1, m2, mb, c2, base, copy1, renamedelete1 |
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614 ) |
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615 elif dsts2: |
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616 # copied/renamed only on side 2 |
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617 _checksinglesidecopies( |
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618 src, dsts2, m2, m1, mb, c1, base, copy2, renamedelete2 |
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619 ) |
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620 |
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621 # find interesting file sets from manifests |
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622 addedinm1 = m1.filesnotin(mb, repo.narrowmatch()) |
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623 addedinm2 = m2.filesnotin(mb, repo.narrowmatch()) |
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624 u1 = sorted(addedinm1 - addedinm2) |
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625 u2 = sorted(addedinm2 - addedinm1) |
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626 |
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627 header = b" unmatched files in %s" |
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628 if u1: |
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629 repo.ui.debug(b"%s:\n %s\n" % (header % b'local', b"\n ".join(u1))) |
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630 if u2: |
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631 repo.ui.debug(b"%s:\n %s\n" % (header % b'other', b"\n ".join(u2))) |
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632 |
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633 fullcopy = copies1.copy() |
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634 fullcopy.update(copies2) |
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635 |
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636 if repo.ui.debugflag: |
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637 renamedeleteset = set() |
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638 divergeset = set() |
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639 for dsts in diverge.values(): |
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640 divergeset.update(dsts) |
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641 for dsts in renamedelete1.values(): |
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642 renamedeleteset.update(dsts) |
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643 for dsts in renamedelete2.values(): |
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644 renamedeleteset.update(dsts) |
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645 |
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646 repo.ui.debug( |
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647 b" all copies found (* = to merge, ! = divergent, " |
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648 b"% = renamed and deleted):\n" |
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649 ) |
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650 for f in sorted(fullcopy): |
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651 note = b"" |
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652 if f in copy1 or f in copy2: |
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653 note += b"*" |
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654 if f in divergeset: |
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655 note += b"!" |
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656 if f in renamedeleteset: |
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657 note += b"%" |
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658 repo.ui.debug( |
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659 b" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, note) |
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660 ) |
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661 del renamedeleteset |
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662 del divergeset |
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663 |
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664 repo.ui.debug(b" checking for directory renames\n") |
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665 |
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666 dirmove1, movewithdir2 = _dir_renames(repo, c1, copy1, copies1, u2) |
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667 dirmove2, movewithdir1 = _dir_renames(repo, c2, copy2, copies2, u1) |
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668 |
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669 copy1.update(copy2) |
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670 renamedelete1.update(renamedelete2) |
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671 movewithdir1.update(movewithdir2) |
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672 dirmove1.update(dirmove2) |
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673 |
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674 return copy1, movewithdir1, diverge, renamedelete1, dirmove1 |
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675 |
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676 |
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677 def _dir_renames(repo, ctx, copy, fullcopy, addedfiles): |
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678 """Finds moved directories and files that should move with them. |
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679 |
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680 ctx: the context for one of the sides |
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681 copy: files copied on the same side (as ctx) |
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682 fullcopy: files copied on the same side (as ctx), including those that |
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683 merge.manifestmerge() won't care about |
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684 addedfiles: added files on the other side (compared to ctx) |
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685 """ |
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686 # generate a directory move map |
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687 d = ctx.dirs() |
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688 invalid = set() |
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689 dirmove = {} |
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690 |
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691 # examine each file copy for a potential directory move, which is |
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692 # when all the files in a directory are moved to a new directory |
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693 for dst, src in pycompat.iteritems(fullcopy): |
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694 dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst) |
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695 if dsrc in invalid: |
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696 # already seen to be uninteresting |
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697 continue |
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698 elif dsrc in d and ddst in d: |
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699 # directory wasn't entirely moved locally |
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700 invalid.add(dsrc) |
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701 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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702 # files from the same directory moved to two different places |
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703 invalid.add(dsrc) |
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704 else: |
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705 # looks good so far |
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706 dirmove[dsrc] = ddst |
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707 |
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708 for i in invalid: |
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709 if i in dirmove: |
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710 del dirmove[i] |
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711 del d, invalid |
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712 |
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713 if not dirmove: |
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714 return {}, {} |
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715 |
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716 dirmove = {k + b"/": v + b"/" for k, v in pycompat.iteritems(dirmove)} |
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717 |
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718 for d in dirmove: |
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719 repo.ui.debug( |
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720 b" discovered dir src: '%s' -> dst: '%s'\n" % (d, dirmove[d]) |
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721 ) |
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722 |
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723 movewithdir = {} |
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724 # check unaccounted nonoverlapping files against directory moves |
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725 for f in addedfiles: |
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726 if f not in fullcopy: |
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727 for d in dirmove: |
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728 if f.startswith(d): |
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729 # new file added in a directory that was moved, move it |
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730 df = dirmove[d] + f[len(d) :] |
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731 if df not in copy: |
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732 movewithdir[f] = df |
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733 repo.ui.debug( |
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734 b" pending file src: '%s' -> dst: '%s'\n" |
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735 % (f, df) |
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736 ) |
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737 break |
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738 |
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739 return dirmove, movewithdir |
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740 |
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741 |
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742 def _heuristicscopytracing(repo, c1, c2, base): |
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743 """ Fast copytracing using filename heuristics |
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744 |
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745 Assumes that moves or renames are of following two types: |
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746 |
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747 1) Inside a directory only (same directory name but different filenames) |
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748 2) Move from one directory to another |
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749 (same filenames but different directory names) |
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750 |
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751 Works only when there are no merge commits in the "source branch". |
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752 Source branch is commits from base up to c2 not including base. |
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753 |
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754 If merge is involved it fallbacks to _fullcopytracing(). |
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755 |
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756 Can be used by setting the following config: |
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757 |
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758 [experimental] |
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759 copytrace = heuristics |
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760 |
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761 In some cases the copy/move candidates found by heuristics can be very large |
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762 in number and that will make the algorithm slow. The number of possible |
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763 candidates to check can be limited by using the config |
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764 `experimental.copytrace.movecandidateslimit` which defaults to 100. |
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765 """ |
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766 |
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767 if c1.rev() is None: |
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768 c1 = c1.p1() |
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769 if c2.rev() is None: |
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770 c2 = c2.p1() |
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771 |
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772 copies = {} |
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773 |
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774 changedfiles = set() |
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775 m1 = c1.manifest() |
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776 if not repo.revs(b'%d::%d', base.rev(), c2.rev()): |
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777 # If base is not in c2 branch, we switch to fullcopytracing |
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778 repo.ui.debug( |
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779 b"switching to full copytracing as base is not " |
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780 b"an ancestor of c2\n" |
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781 ) |
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782 return _fullcopytracing(repo, c1, c2, base) |
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783 |
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784 ctx = c2 |
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785 while ctx != base: |
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786 if len(ctx.parents()) == 2: |
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787 # To keep things simple let's not handle merges |
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788 repo.ui.debug(b"switching to full copytracing because of merges\n") |
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789 return _fullcopytracing(repo, c1, c2, base) |
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790 changedfiles.update(ctx.files()) |
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791 ctx = ctx.p1() |
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792 |
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793 cp = _forwardcopies(base, c2) |
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794 for dst, src in pycompat.iteritems(cp): |
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795 if src in m1: |
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796 copies[dst] = src |
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797 |
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798 # file is missing if it isn't present in the destination, but is present in |
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799 # the base and present in the source. |
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800 # Presence in the base is important to exclude added files, presence in the |
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801 # source is important to exclude removed files. |
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802 filt = lambda f: f not in m1 and f in base and f in c2 |
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803 missingfiles = [f for f in changedfiles if filt(f)] |
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804 |
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805 if missingfiles: |
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806 basenametofilename = collections.defaultdict(list) |
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807 dirnametofilename = collections.defaultdict(list) |
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808 |
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809 for f in m1.filesnotin(base.manifest()): |
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810 basename = os.path.basename(f) |
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811 dirname = os.path.dirname(f) |
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812 basenametofilename[basename].append(f) |
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813 dirnametofilename[dirname].append(f) |
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814 |
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815 for f in missingfiles: |
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816 basename = os.path.basename(f) |
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817 dirname = os.path.dirname(f) |
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818 samebasename = basenametofilename[basename] |
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819 samedirname = dirnametofilename[dirname] |
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820 movecandidates = samebasename + samedirname |
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821 # f is guaranteed to be present in c2, that's why |
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822 # c2.filectx(f) won't fail |
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823 f2 = c2.filectx(f) |
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824 # we can have a lot of candidates which can slow down the heuristics |
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825 # config value to limit the number of candidates moves to check |
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826 maxcandidates = repo.ui.configint( |
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827 b'experimental', b'copytrace.movecandidateslimit' |
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828 ) |
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829 |
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830 if len(movecandidates) > maxcandidates: |
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831 repo.ui.status( |
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832 _( |
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833 b"skipping copytracing for '%s', more " |
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834 b"candidates than the limit: %d\n" |
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835 ) |
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836 % (f, len(movecandidates)) |
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837 ) |
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838 continue |
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839 |
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840 for candidate in movecandidates: |
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841 f1 = c1.filectx(candidate) |
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842 if _related(f1, f2): |
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843 # if there are a few related copies then we'll merge |
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844 # changes into all of them. This matches the behaviour |
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845 # of upstream copytracing |
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846 copies[candidate] = f |
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847 |
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848 return copies, {}, {}, {}, {} |
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849 |
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850 |
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851 def _related(f1, f2): |
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852 """return True if f1 and f2 filectx have a common ancestor |
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853 |
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854 Walk back to common ancestor to see if the two files originate |
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855 from the same file. Since workingfilectx's rev() is None it messes |
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856 up the integer comparison logic, hence the pre-step check for |
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857 None (f1 and f2 can only be workingfilectx's initially). |
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858 """ |
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859 |
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860 if f1 == f2: |
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861 return True # a match |
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862 |
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863 g1, g2 = f1.ancestors(), f2.ancestors() |
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864 try: |
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865 f1r, f2r = f1.linkrev(), f2.linkrev() |
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866 |
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867 if f1r is None: |
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868 f1 = next(g1) |
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869 if f2r is None: |
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870 f2 = next(g2) |
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871 |
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872 while True: |
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873 f1r, f2r = f1.linkrev(), f2.linkrev() |
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874 if f1r > f2r: |
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875 f1 = next(g1) |
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876 elif f2r > f1r: |
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877 f2 = next(g2) |
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878 else: # f1 and f2 point to files in the same linkrev |
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879 return f1 == f2 # true if they point to the same file |
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880 except StopIteration: |
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881 return False |
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882 |
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883 |
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884 def graftcopies(wctx, ctx, base): |
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885 """reproduce copies between base and ctx in the wctx |
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886 |
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887 Unlike mergecopies(), this function will only consider copies between base |
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888 and ctx; it will ignore copies between base and wctx. Also unlike |
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889 mergecopies(), this function will apply copies to the working copy (instead |
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890 of just returning information about the copies). That makes it cheaper |
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891 (especially in the common case of base==ctx.p1()) and useful also when |
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892 experimental.copytrace=off. |
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893 |
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894 merge.update() will have already marked most copies, but it will only |
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895 mark copies if it thinks the source files are related (see |
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896 merge._related()). It will also not mark copies if the file wasn't modified |
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897 on the local side. This function adds the copies that were "missed" |
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898 by merge.update(). |
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899 """ |
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900 new_copies = pathcopies(base, ctx) |
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901 _filter(wctx.p1(), wctx, new_copies) |
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902 for dst, src in pycompat.iteritems(new_copies): |
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903 wctx[dst].markcopied(src) |
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904 |
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905 |
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906 def computechangesetfilesadded(ctx): |
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907 """return the list of files added in a changeset |
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908 """ |
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909 added = [] |
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910 for f in ctx.files(): |
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911 if not any(f in p for p in ctx.parents()): |
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912 added.append(f) |
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913 return added |
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914 |
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915 |
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916 def computechangesetfilesremoved(ctx): |
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917 """return the list of files removed in a changeset |
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918 """ |
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919 removed = [] |
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920 for f in ctx.files(): |
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921 if f not in ctx: |
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922 removed.append(f) |
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923 return removed |
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924 |
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925 |
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|
926 def computechangesetcopies(ctx): |
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927 """return the copies data for a changeset |
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928 |
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929 The copies data are returned as a pair of dictionnary (p1copies, p2copies). |
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930 |
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931 Each dictionnary are in the form: `{newname: oldname}` |
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|
932 """ |
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933 p1copies = {} |
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934 p2copies = {} |
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|
935 p1 = ctx.p1() |
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|
936 p2 = ctx.p2() |
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|
937 narrowmatch = ctx._repo.narrowmatch() |
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|
938 for dst in ctx.files(): |
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|
939 if not narrowmatch(dst) or dst not in ctx: |
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|
940 continue |
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941 copied = ctx[dst].renamed() |
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942 if not copied: |
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943 continue |
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944 src, srcnode = copied |
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945 if src in p1 and p1[src].filenode() == srcnode: |
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|
946 p1copies[dst] = src |
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947 elif src in p2 and p2[src].filenode() == srcnode: |
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|
948 p2copies[dst] = src |
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|
949 return p1copies, p2copies |
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950 |
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951 |
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952 def encodecopies(files, copies): |
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953 items = [] |
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954 for i, dst in enumerate(files): |
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955 if dst in copies: |
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956 items.append(b'%d\0%s' % (i, copies[dst])) |
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957 if len(items) != len(copies): |
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958 raise error.ProgrammingError( |
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959 b'some copy targets missing from file list' |
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960 ) |
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961 return b"\n".join(items) |
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962 |
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963 |
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964 def decodecopies(files, data): |
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|
965 try: |
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966 copies = {} |
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967 if not data: |
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968 return copies |
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969 for l in data.split(b'\n'): |
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970 strindex, src = l.split(b'\0') |
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971 i = int(strindex) |
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972 dst = files[i] |
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973 copies[dst] = src |
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974 return copies |
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975 except (ValueError, IndexError): |
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976 # Perhaps someone had chosen the same key name (e.g. "p1copies") and |
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977 # used different syntax for the value. |
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978 return None |
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979 |
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980 |
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981 def encodefileindices(files, subset): |
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982 subset = set(subset) |
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983 indices = [] |
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984 for i, f in enumerate(files): |
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985 if f in subset: |
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986 indices.append(b'%d' % i) |
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987 return b'\n'.join(indices) |
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988 |
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989 |
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990 def decodefileindices(files, data): |
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991 try: |
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992 subset = [] |
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993 if not data: |
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994 return subset |
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995 for strindex in data.split(b'\n'): |
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996 i = int(strindex) |
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997 if i < 0 or i >= len(files): |
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998 return None |
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999 subset.append(files[i]) |
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1000 return subset |
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1001 except (ValueError, IndexError): |
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1002 # Perhaps someone had chosen the same key name (e.g. "added") and |
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1003 # used different syntax for the value. |
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1004 return None |
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1005 |
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1006 |
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1007 def _getsidedata(srcrepo, rev): |
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1008 ctx = srcrepo[rev] |
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1009 filescopies = computechangesetcopies(ctx) |
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1010 filesadded = computechangesetfilesadded(ctx) |
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1011 filesremoved = computechangesetfilesremoved(ctx) |
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1012 sidedata = {} |
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1013 if any([filescopies, filesadded, filesremoved]): |
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1014 sortedfiles = sorted(ctx.files()) |
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1015 p1copies, p2copies = filescopies |
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1016 p1copies = encodecopies(sortedfiles, p1copies) |
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1017 p2copies = encodecopies(sortedfiles, p2copies) |
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1018 filesadded = encodefileindices(sortedfiles, filesadded) |
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1019 filesremoved = encodefileindices(sortedfiles, filesremoved) |
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1020 if p1copies: |
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1021 sidedata[sidedatamod.SD_P1COPIES] = p1copies |
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1022 if p2copies: |
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1023 sidedata[sidedatamod.SD_P2COPIES] = p2copies |
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1024 if filesadded: |
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1025 sidedata[sidedatamod.SD_FILESADDED] = filesadded |
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1026 if filesremoved: |
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1027 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved |
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1028 return sidedata |
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1029 |
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1030 |
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1031 def getsidedataadder(srcrepo, destrepo): |
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1032 use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade') |
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1033 if pycompat.iswindows or not use_w: |
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1034 return _get_simple_sidedata_adder(srcrepo, destrepo) |
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1035 else: |
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1036 return _get_worker_sidedata_adder(srcrepo, destrepo) |
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1037 |
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1038 |
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1039 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens): |
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1040 """The function used by worker precomputing sidedata |
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1041 |
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1042 It read an input queue containing revision numbers |
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1043 It write in an output queue containing (rev, <sidedata-map>) |
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1044 |
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1045 The `None` input value is used as a stop signal. |
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1046 |
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1047 The `tokens` semaphore is user to avoid having too many unprocessed |
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1048 entries. The workers needs to acquire one token before fetching a task. |
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1049 They will be released by the consumer of the produced data. |
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1050 """ |
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1051 tokens.acquire() |
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1052 rev = revs_queue.get() |
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1053 while rev is not None: |
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1054 data = _getsidedata(srcrepo, rev) |
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1055 sidedata_queue.put((rev, data)) |
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1056 tokens.acquire() |
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1057 rev = revs_queue.get() |
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1058 # processing of `None` is completed, release the token. |
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1059 tokens.release() |
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1060 |
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1061 |
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1062 BUFF_PER_WORKER = 50 |
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1063 |
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1064 |
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1065 def _get_worker_sidedata_adder(srcrepo, destrepo): |
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1066 """The parallel version of the sidedata computation |
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1067 |
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1068 This code spawn a pool of worker that precompute a buffer of sidedata |
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1069 before we actually need them""" |
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1070 # avoid circular import copies -> scmutil -> worker -> copies |
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1071 from . import worker |
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1072 |
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1073 nbworkers = worker._numworkers(srcrepo.ui) |
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1074 |
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1075 tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER) |
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1076 revsq = multiprocessing.Queue() |
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1077 sidedataq = multiprocessing.Queue() |
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1078 |
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1079 assert srcrepo.filtername is None |
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1080 # queue all tasks beforehand, revision numbers are small and it make |
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1081 # synchronisation simpler |
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1082 # |
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1083 # Since the computation for each node can be quite expensive, the overhead |
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1084 # of using a single queue is not revelant. In practice, most computation |
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1085 # are fast but some are very expensive and dominate all the other smaller |
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1086 # cost. |
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1087 for r in srcrepo.changelog.revs(): |
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1088 revsq.put(r) |
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1089 # queue the "no more tasks" markers |
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1090 for i in range(nbworkers): |
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1091 revsq.put(None) |
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1092 |
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1093 allworkers = [] |
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1094 for i in range(nbworkers): |
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1095 args = (srcrepo, revsq, sidedataq, tokens) |
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1096 w = multiprocessing.Process(target=_sidedata_worker, args=args) |
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1097 allworkers.append(w) |
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1098 w.start() |
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1099 |
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1100 # dictionnary to store results for revision higher than we one we are |
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1101 # looking for. For example, if we need the sidedatamap for 42, and 43 is |
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1102 # received, when shelve 43 for later use. |
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1103 staging = {} |
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1104 |
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1105 def sidedata_companion(revlog, rev): |
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1106 sidedata = {} |
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1107 if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog |
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1108 # Is the data previously shelved ? |
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1109 sidedata = staging.pop(rev, None) |
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1110 if sidedata is None: |
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1111 # look at the queued result until we find the one we are lookig |
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1112 # for (shelve the other ones) |
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1113 r, sidedata = sidedataq.get() |
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1114 while r != rev: |
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1115 staging[r] = sidedata |
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1116 r, sidedata = sidedataq.get() |
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1117 tokens.release() |
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1118 return False, (), sidedata |
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1119 |
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1120 return sidedata_companion |
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1121 |
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1122 |
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1123 def _get_simple_sidedata_adder(srcrepo, destrepo): |
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1124 """The simple version of the sidedata computation |
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1125 |
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1126 It just compute it in the same thread on request""" |
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1127 |
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1128 def sidedatacompanion(revlog, rev): |
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1129 sidedata = {} |
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1130 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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1131 sidedata = _getsidedata(srcrepo, rev) |
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1132 return False, (), sidedata |
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1133 |
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1134 return sidedatacompanion |
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1135 |
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1136 |
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1137 def getsidedataremover(srcrepo, destrepo): |
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1138 def sidedatacompanion(revlog, rev): |
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1139 f = () |
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1140 if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog |
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1141 if revlog.flags(rev) & REVIDX_SIDEDATA: |
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1142 f = ( |
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1143 sidedatamod.SD_P1COPIES, |
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1144 sidedatamod.SD_P2COPIES, |
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1145 sidedatamod.SD_FILESADDED, |
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1146 sidedatamod.SD_FILESREMOVED, |
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1147 ) |
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1148 return False, f, {} |
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1149 |
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1150 return sidedatacompanion |