Mercurial > hg
annotate mercurial/copies.py @ 43147:54e943b28101
sidedatacopies: move various copies related function to the copies modules
We will need to access these logic form the copies module. So we move them from
their higher level module to the lower level `copies` module. We cannot use them
from their top level module as it would create cycles.
Differential Revision: https://phab.mercurial-scm.org/D6954
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sun, 06 Oct 2019 23:36:51 -0400 |
parents | 0171483b082f |
children | 843da18386d5 |
rev | line source |
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1 # copies.py - copy detection for Mercurial |
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2 # |
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3 # Copyright 2008 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import collections |
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11 import heapq |
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12 import os |
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13 |
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14 from .i18n import _ |
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15 |
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16 from . import ( |
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17 error, |
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18 match as matchmod, |
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19 node, |
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20 pathutil, |
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21 pycompat, |
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22 util, |
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23 ) |
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24 from .utils import stringutil |
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25 |
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26 |
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27 def _findlimit(repo, ctxa, ctxb): |
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28 """ |
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29 Find the last revision that needs to be checked to ensure that a full |
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30 transitive closure for file copies can be properly calculated. |
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31 Generally, this means finding the earliest revision number that's an |
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32 ancestor of a or b but not both, except when a or b is a direct descendent |
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33 of the other, in which case we can return the minimum revnum of a and b. |
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34 """ |
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35 |
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36 # basic idea: |
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37 # - mark a and b with different sides |
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38 # - if a parent's children are all on the same side, the parent is |
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39 # on that side, otherwise it is on no side |
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40 # - walk the graph in topological order with the help of a heap; |
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41 # - add unseen parents to side map |
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42 # - clear side of any parent that has children on different sides |
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43 # - track number of interesting revs that might still be on a side |
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44 # - track the lowest interesting rev seen |
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45 # - quit when interesting revs is zero |
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46 |
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47 cl = repo.changelog |
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48 wdirparents = None |
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49 a = ctxa.rev() |
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50 b = ctxb.rev() |
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51 if a is None: |
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52 wdirparents = (ctxa.p1(), ctxa.p2()) |
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53 a = node.wdirrev |
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54 if b is None: |
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55 assert not wdirparents |
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56 wdirparents = (ctxb.p1(), ctxb.p2()) |
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57 b = node.wdirrev |
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58 |
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59 side = {a: -1, b: 1} |
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60 visit = [-a, -b] |
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61 heapq.heapify(visit) |
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62 interesting = len(visit) |
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63 limit = node.wdirrev |
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64 |
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65 while interesting: |
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66 r = -(heapq.heappop(visit)) |
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67 if r == node.wdirrev: |
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68 parents = [pctx.rev() for pctx in wdirparents] |
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69 else: |
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70 parents = cl.parentrevs(r) |
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71 if parents[1] == node.nullrev: |
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72 parents = parents[:1] |
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73 for p in parents: |
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74 if p not in side: |
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75 # first time we see p; add it to visit |
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76 side[p] = side[r] |
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77 if side[p]: |
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78 interesting += 1 |
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79 heapq.heappush(visit, -p) |
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80 elif side[p] and side[p] != side[r]: |
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81 # p was interesting but now we know better |
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82 side[p] = 0 |
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83 interesting -= 1 |
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84 if side[r]: |
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85 limit = r # lowest rev visited |
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86 interesting -= 1 |
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87 |
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88 # Consider the following flow (see test-commit-amend.t under issue4405): |
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89 # 1/ File 'a0' committed |
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90 # 2/ File renamed from 'a0' to 'a1' in a new commit (call it 'a1') |
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91 # 3/ Move back to first commit |
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92 # 4/ Create a new commit via revert to contents of 'a1' (call it 'a1-amend') |
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93 # 5/ Rename file from 'a1' to 'a2' and commit --amend 'a1-msg' |
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94 # |
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95 # During the amend in step five, we will be in this state: |
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96 # |
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97 # @ 3 temporary amend commit for a1-amend |
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98 # | |
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99 # o 2 a1-amend |
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100 # | |
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101 # | o 1 a1 |
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102 # |/ |
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103 # o 0 a0 |
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104 # |
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105 # When _findlimit is called, a and b are revs 3 and 0, so limit will be 2, |
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106 # yet the filelog has the copy information in rev 1 and we will not look |
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107 # back far enough unless we also look at the a and b as candidates. |
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108 # This only occurs when a is a descendent of b or visa-versa. |
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109 return min(limit, a, b) |
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110 |
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111 |
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112 def _filter(src, dst, t): |
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113 """filters out invalid copies after chaining""" |
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114 |
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115 # When _chain()'ing copies in 'a' (from 'src' via some other commit 'mid') |
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116 # with copies in 'b' (from 'mid' to 'dst'), we can get the different cases |
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117 # in the following table (not including trivial cases). For example, case 2 |
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118 # is where a file existed in 'src' and remained under that name in 'mid' and |
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119 # then was renamed between 'mid' and 'dst'. |
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120 # |
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121 # case src mid dst result |
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122 # 1 x y - - |
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123 # 2 x y y x->y |
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124 # 3 x y x - |
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125 # 4 x y z x->z |
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126 # 5 - x y - |
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127 # 6 x x y x->y |
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128 # |
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129 # _chain() takes care of chaining the copies in 'a' and 'b', but it |
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130 # cannot tell the difference between cases 1 and 2, between 3 and 4, or |
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131 # between 5 and 6, so it includes all cases in its result. |
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132 # Cases 1, 3, and 5 are then removed by _filter(). |
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133 |
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134 for k, v in list(t.items()): |
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135 # remove copies from files that didn't exist |
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136 if v not in src: |
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137 del t[k] |
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138 # remove criss-crossed copies |
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139 elif k in src and v in dst: |
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140 del t[k] |
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141 # remove copies to files that were then removed |
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142 elif k not in dst: |
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143 del t[k] |
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144 |
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145 |
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146 def _chain(a, b): |
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147 """chain two sets of copies 'a' and 'b'""" |
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148 t = a.copy() |
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149 for k, v in pycompat.iteritems(b): |
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150 if v in t: |
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151 t[k] = t[v] |
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152 else: |
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153 t[k] = v |
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154 return t |
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155 |
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156 |
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157 def _tracefile(fctx, am, basemf, limit): |
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158 """return file context that is the ancestor of fctx present in ancestor |
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159 manifest am, stopping after the first ancestor lower than limit""" |
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160 |
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161 for f in fctx.ancestors(): |
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162 path = f.path() |
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163 if am.get(path, None) == f.filenode(): |
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164 return path |
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165 if basemf and basemf.get(path, None) == f.filenode(): |
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166 return path |
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167 if not f.isintroducedafter(limit): |
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168 return None |
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169 |
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170 |
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171 def _dirstatecopies(repo, match=None): |
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172 ds = repo.dirstate |
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173 c = ds.copies().copy() |
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174 for k in list(c): |
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175 if ds[k] not in b'anm' or (match and not match(k)): |
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176 del c[k] |
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177 return c |
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178 |
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179 |
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180 def _computeforwardmissing(a, b, match=None): |
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181 """Computes which files are in b but not a. |
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182 This is its own function so extensions can easily wrap this call to see what |
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183 files _forwardcopies is about to process. |
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184 """ |
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185 ma = a.manifest() |
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186 mb = b.manifest() |
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187 return mb.filesnotin(ma, match=match) |
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188 |
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189 |
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190 def usechangesetcentricalgo(repo): |
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191 """Checks if we should use changeset-centric copy algorithms""" |
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192 if repo.filecopiesmode == b'changeset-sidedata': |
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193 return True |
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194 readfrom = repo.ui.config(b'experimental', b'copies.read-from') |
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195 changesetsource = (b'changeset-only', b'compatibility') |
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196 return readfrom in changesetsource |
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197 |
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198 |
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199 def _committedforwardcopies(a, b, base, match): |
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200 """Like _forwardcopies(), but b.rev() cannot be None (working copy)""" |
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201 # files might have to be traced back to the fctx parent of the last |
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202 # one-side-only changeset, but not further back than that |
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203 repo = a._repo |
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204 |
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205 if usechangesetcentricalgo(repo): |
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206 return _changesetforwardcopies(a, b, match) |
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207 |
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208 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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209 dbg = repo.ui.debug |
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210 if debug: |
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211 dbg(b'debug.copies: looking into rename from %s to %s\n' % (a, b)) |
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212 limit = _findlimit(repo, a, b) |
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213 if debug: |
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214 dbg(b'debug.copies: search limit: %d\n' % limit) |
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215 am = a.manifest() |
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216 basemf = None if base is None else base.manifest() |
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217 |
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218 # find where new files came from |
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219 # we currently don't try to find where old files went, too expensive |
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220 # this means we can miss a case like 'hg rm b; hg cp a b' |
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221 cm = {} |
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222 |
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223 # Computing the forward missing is quite expensive on large manifests, since |
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224 # it compares the entire manifests. We can optimize it in the common use |
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225 # case of computing what copies are in a commit versus its parent (like |
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226 # during a rebase or histedit). Note, we exclude merge commits from this |
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227 # optimization, since the ctx.files() for a merge commit is not correct for |
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228 # this comparison. |
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229 forwardmissingmatch = match |
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230 if b.p1() == a and b.p2().node() == node.nullid: |
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231 filesmatcher = matchmod.exact(b.files()) |
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232 forwardmissingmatch = matchmod.intersectmatchers(match, filesmatcher) |
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233 missing = _computeforwardmissing(a, b, match=forwardmissingmatch) |
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234 |
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235 ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) |
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236 |
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237 if debug: |
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238 dbg(b'debug.copies: missing files to search: %d\n' % len(missing)) |
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239 |
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240 for f in sorted(missing): |
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241 if debug: |
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242 dbg(b'debug.copies: tracing file: %s\n' % f) |
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243 fctx = b[f] |
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244 fctx._ancestrycontext = ancestrycontext |
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245 |
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246 if debug: |
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247 start = util.timer() |
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248 opath = _tracefile(fctx, am, basemf, limit) |
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249 if opath: |
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250 if debug: |
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251 dbg(b'debug.copies: rename of: %s\n' % opath) |
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252 cm[f] = opath |
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253 if debug: |
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254 dbg( |
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255 b'debug.copies: time: %f seconds\n' |
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256 % (util.timer() - start) |
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257 ) |
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258 return cm |
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259 |
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260 |
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261 def _changesetforwardcopies(a, b, match): |
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262 if a.rev() in (node.nullrev, b.rev()): |
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263 return {} |
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264 |
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265 repo = a.repo() |
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266 children = {} |
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267 cl = repo.changelog |
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268 missingrevs = cl.findmissingrevs(common=[a.rev()], heads=[b.rev()]) |
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269 for r in missingrevs: |
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270 for p in cl.parentrevs(r): |
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271 if p == node.nullrev: |
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272 continue |
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273 if p not in children: |
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274 children[p] = [r] |
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275 else: |
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276 children[p].append(r) |
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277 |
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278 roots = set(children) - set(missingrevs) |
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279 # 'work' contains 3-tuples of a (revision number, parent number, copies). |
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280 # The parent number is only used for knowing which parent the copies dict |
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281 # came from. |
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282 # NOTE: To reduce costly copying the 'copies' dicts, we reuse the same |
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283 # instance for *one* of the child nodes (the last one). Once an instance |
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284 # has been put on the queue, it is thus no longer safe to modify it. |
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285 # Conversely, it *is* safe to modify an instance popped off the queue. |
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286 work = [(r, 1, {}) for r in roots] |
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287 heapq.heapify(work) |
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288 alwaysmatch = match.always() |
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289 while work: |
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290 r, i1, copies = heapq.heappop(work) |
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291 if work and work[0][0] == r: |
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292 # We are tracing copies from both parents |
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293 r, i2, copies2 = heapq.heappop(work) |
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294 for dst, src in copies2.items(): |
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295 # Unlike when copies are stored in the filelog, we consider |
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296 # it a copy even if the destination already existed on the |
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297 # other branch. It's simply too expensive to check if the |
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298 # file existed in the manifest. |
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299 if dst not in copies: |
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300 # If it was copied on the p1 side, leave it as copied from |
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301 # that side, even if it was also copied on the p2 side. |
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302 copies[dst] = copies2[dst] |
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303 if r == b.rev(): |
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304 return copies |
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305 for i, c in enumerate(children[r]): |
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306 childctx = repo[c] |
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307 if r == childctx.p1().rev(): |
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308 parent = 1 |
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309 childcopies = childctx.p1copies() |
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310 else: |
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311 assert r == childctx.p2().rev() |
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312 parent = 2 |
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313 childcopies = childctx.p2copies() |
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314 if not alwaysmatch: |
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315 childcopies = { |
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316 dst: src for dst, src in childcopies.items() if match(dst) |
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317 } |
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318 # Copy the dict only if later iterations will also need it |
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319 if i != len(children[r]) - 1: |
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320 newcopies = copies.copy() |
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321 else: |
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322 newcopies = copies |
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323 if childcopies: |
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324 newcopies = _chain(newcopies, childcopies) |
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325 for f in childctx.filesremoved(): |
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326 if f in newcopies: |
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327 del newcopies[f] |
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328 heapq.heappush(work, (c, parent, newcopies)) |
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329 assert False |
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330 |
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331 |
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332 def _forwardcopies(a, b, base=None, match=None): |
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333 """find {dst@b: src@a} copy mapping where a is an ancestor of b""" |
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334 |
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335 if base is None: |
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336 base = a |
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337 match = a.repo().narrowmatch(match) |
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338 # check for working copy |
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339 if b.rev() is None: |
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340 cm = _committedforwardcopies(a, b.p1(), base, match) |
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341 # combine copies from dirstate if necessary |
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342 copies = _chain(cm, _dirstatecopies(b._repo, match)) |
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343 else: |
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344 copies = _committedforwardcopies(a, b, base, match) |
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345 return copies |
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346 |
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347 |
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348 def _backwardrenames(a, b, match): |
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349 if a._repo.ui.config(b'experimental', b'copytrace') == b'off': |
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350 return {} |
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351 |
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352 # Even though we're not taking copies into account, 1:n rename situations |
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353 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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354 # arbitrarily pick one of the renames. |
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355 # We don't want to pass in "match" here, since that would filter |
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356 # the destination by it. Since we're reversing the copies, we want |
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357 # to filter the source instead. |
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358 f = _forwardcopies(b, a) |
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359 r = {} |
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360 for k, v in sorted(pycompat.iteritems(f)): |
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361 if match and not match(v): |
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362 continue |
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363 # remove copies |
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364 if v in a: |
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365 continue |
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366 r[v] = k |
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367 return r |
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368 |
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369 |
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370 def pathcopies(x, y, match=None): |
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371 """find {dst@y: src@x} copy mapping for directed compare""" |
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372 repo = x._repo |
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373 debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') |
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374 if debug: |
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375 repo.ui.debug( |
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376 b'debug.copies: searching copies from %s to %s\n' % (x, y) |
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377 ) |
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378 if x == y or not x or not y: |
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379 return {} |
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380 a = y.ancestor(x) |
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381 if a == x: |
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382 if debug: |
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383 repo.ui.debug(b'debug.copies: search mode: forward\n') |
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384 if y.rev() is None and x == y.p1(): |
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385 # short-circuit to avoid issues with merge states |
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386 return _dirstatecopies(repo, match) |
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387 copies = _forwardcopies(x, y, match=match) |
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388 elif a == y: |
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389 if debug: |
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390 repo.ui.debug(b'debug.copies: search mode: backward\n') |
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391 copies = _backwardrenames(x, y, match=match) |
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392 else: |
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393 if debug: |
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394 repo.ui.debug(b'debug.copies: search mode: combined\n') |
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395 base = None |
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396 if a.rev() != node.nullrev: |
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397 base = x |
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398 copies = _chain( |
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399 _backwardrenames(x, a, match=match), |
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400 _forwardcopies(a, y, base, match=match), |
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401 ) |
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402 _filter(x, y, copies) |
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403 return copies |
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404 |
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405 |
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406 def mergecopies(repo, c1, c2, base): |
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407 """ |
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408 Finds moves and copies between context c1 and c2 that are relevant for |
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409 merging. 'base' will be used as the merge base. |
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410 |
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411 Copytracing is used in commands like rebase, merge, unshelve, etc to merge |
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412 files that were moved/ copied in one merge parent and modified in another. |
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413 For example: |
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414 |
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415 o ---> 4 another commit |
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416 | |
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417 | o ---> 3 commit that modifies a.txt |
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418 | / |
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419 o / ---> 2 commit that moves a.txt to b.txt |
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420 |/ |
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421 o ---> 1 merge base |
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422 |
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423 If we try to rebase revision 3 on revision 4, since there is no a.txt in |
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424 revision 4, and if user have copytrace disabled, we prints the following |
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425 message: |
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426 |
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427 ```other changed <file> which local deleted``` |
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428 |
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429 Returns five dicts: "copy", "movewithdir", "diverge", "renamedelete" and |
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430 "dirmove". |
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431 |
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432 "copy" is a mapping from destination name -> source name, |
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433 where source is in c1 and destination is in c2 or vice-versa. |
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434 |
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435 "movewithdir" is a mapping from source name -> destination name, |
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436 where the file at source present in one context but not the other |
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437 needs to be moved to destination by the merge process, because the |
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438 other context moved the directory it is in. |
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439 |
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440 "diverge" is a mapping of source name -> list of destination names |
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441 for divergent renames. |
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442 |
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443 "renamedelete" is a mapping of source name -> list of destination |
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444 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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445 |
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446 "dirmove" is a mapping of detected source dir -> destination dir renames. |
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447 This is needed for handling changes to new files previously grafted into |
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448 renamed directories. |
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449 |
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450 This function calls different copytracing algorithms based on config. |
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451 """ |
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452 # avoid silly behavior for update from empty dir |
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453 if not c1 or not c2 or c1 == c2: |
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454 return {}, {}, {}, {}, {} |
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455 |
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456 narrowmatch = c1.repo().narrowmatch() |
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457 |
6646
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458 # avoid silly behavior for parent -> working dir |
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459 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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460 return _dirstatecopies(repo, narrowmatch), {}, {}, {}, {} |
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461 |
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462 copytracing = repo.ui.config(b'experimental', b'copytrace') |
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463 if stringutil.parsebool(copytracing) is False: |
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464 # stringutil.parsebool() returns None when it is unable to parse the |
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465 # value, so we should rely on making sure copytracing is on such cases |
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466 return {}, {}, {}, {}, {} |
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467 |
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468 if usechangesetcentricalgo(repo): |
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469 # The heuristics don't make sense when we need changeset-centric algos |
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470 return _fullcopytracing(repo, c1, c2, base) |
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471 |
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472 # Copy trace disabling is explicitly below the node == p1 logic above |
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473 # because the logic above is required for a simple copy to be kept across a |
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474 # rebase. |
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475 if copytracing == b'heuristics': |
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476 # Do full copytracing if only non-public revisions are involved as |
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477 # that will be fast enough and will also cover the copies which could |
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478 # be missed by heuristics |
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479 if _isfullcopytraceable(repo, c1, base): |
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480 return _fullcopytracing(repo, c1, c2, base) |
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481 return _heuristicscopytracing(repo, c1, c2, base) |
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482 else: |
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483 return _fullcopytracing(repo, c1, c2, base) |
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484 |
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485 |
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486 def _isfullcopytraceable(repo, c1, base): |
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487 """ Checks that if base, source and destination are all no-public branches, |
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488 if yes let's use the full copytrace algorithm for increased capabilities |
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489 since it will be fast enough. |
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490 |
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491 `experimental.copytrace.sourcecommitlimit` can be used to set a limit for |
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492 number of changesets from c1 to base such that if number of changesets are |
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493 more than the limit, full copytracing algorithm won't be used. |
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494 """ |
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495 if c1.rev() is None: |
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496 c1 = c1.p1() |
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497 if c1.mutable() and base.mutable(): |
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498 sourcecommitlimit = repo.ui.configint( |
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499 b'experimental', b'copytrace.sourcecommitlimit' |
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500 ) |
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501 commits = len(repo.revs(b'%d::%d', base.rev(), c1.rev())) |
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502 return commits < sourcecommitlimit |
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503 return False |
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504 |
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505 |
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|
506 def _checksinglesidecopies( |
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|
507 src, dsts1, m1, m2, mb, c2, base, copy, renamedelete |
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|
508 ): |
42222
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|
509 if src not in m2: |
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|
510 # deleted on side 2 |
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|
511 if src not in m1: |
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512 # renamed on side 1, deleted on side 2 |
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|
513 renamedelete[src] = dsts1 |
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514 elif m2[src] != mb[src]: |
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515 if not _related(c2[src], base[src]): |
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|
516 return |
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|
517 # modified on side 2 |
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518 for dst in dsts1: |
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|
519 if dst not in m2: |
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520 # dst not added on side 2 (handle as regular |
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|
521 # "both created" case in manifestmerge otherwise) |
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|
522 copy[dst] = src |
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|
523 |
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|
524 |
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525 def _fullcopytracing(repo, c1, c2, base): |
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|
526 """ The full copytracing algorithm which finds all the new files that were |
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|
527 added from merge base up to the top commit and for each file it checks if |
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|
528 this file was copied from another file. |
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|
529 |
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|
530 This is pretty slow when a lot of changesets are involved but will track all |
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|
531 the copies. |
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|
532 """ |
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|
533 m1 = c1.manifest() |
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|
534 m2 = c2.manifest() |
30186
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|
535 mb = base.manifest() |
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|
536 |
42222
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|
537 copies1 = pathcopies(base, c1) |
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|
538 copies2 = pathcopies(base, c2) |
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|
539 |
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|
540 inversecopies1 = {} |
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|
541 inversecopies2 = {} |
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542 for dst, src in copies1.items(): |
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543 inversecopies1.setdefault(src, []).append(dst) |
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|
544 for dst, src in copies2.items(): |
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545 inversecopies2.setdefault(src, []).append(dst) |
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|
546 |
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547 copy = {} |
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|
548 diverge = {} |
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|
549 renamedelete = {} |
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|
550 allsources = set(inversecopies1) | set(inversecopies2) |
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551 for src in allsources: |
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552 dsts1 = inversecopies1.get(src) |
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553 dsts2 = inversecopies2.get(src) |
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554 if dsts1 and dsts2: |
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555 # copied/renamed on both sides |
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556 if src not in m1 and src not in m2: |
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557 # renamed on both sides |
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558 dsts1 = set(dsts1) |
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559 dsts2 = set(dsts2) |
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560 # If there's some overlap in the rename destinations, we |
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561 # consider it not divergent. For example, if side 1 copies 'a' |
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562 # to 'b' and 'c' and deletes 'a', and side 2 copies 'a' to 'c' |
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563 # and 'd' and deletes 'a'. |
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564 if dsts1 & dsts2: |
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565 for dst in dsts1 & dsts2: |
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566 copy[dst] = src |
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567 else: |
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568 diverge[src] = sorted(dsts1 | dsts2) |
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569 elif src in m1 and src in m2: |
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570 # copied on both sides |
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571 dsts1 = set(dsts1) |
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572 dsts2 = set(dsts2) |
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573 for dst in dsts1 & dsts2: |
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574 copy[dst] = src |
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575 # TODO: Handle cases where it was renamed on one side and copied |
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576 # on the other side |
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577 elif dsts1: |
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578 # copied/renamed only on side 1 |
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579 _checksinglesidecopies( |
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580 src, dsts1, m1, m2, mb, c2, base, copy, renamedelete |
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581 ) |
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582 elif dsts2: |
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583 # copied/renamed only on side 2 |
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584 _checksinglesidecopies( |
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585 src, dsts2, m2, m1, mb, c1, base, copy, renamedelete |
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586 ) |
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587 |
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588 renamedeleteset = set() |
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589 divergeset = set() |
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590 for dsts in diverge.values(): |
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591 divergeset.update(dsts) |
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592 for dsts in renamedelete.values(): |
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593 renamedeleteset.update(dsts) |
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594 |
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595 # find interesting file sets from manifests |
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596 addedinm1 = m1.filesnotin(mb, repo.narrowmatch()) |
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597 addedinm2 = m2.filesnotin(mb, repo.narrowmatch()) |
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598 u1 = sorted(addedinm1 - addedinm2) |
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599 u2 = sorted(addedinm2 - addedinm1) |
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600 |
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601 header = b" unmatched files in %s" |
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602 if u1: |
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603 repo.ui.debug(b"%s:\n %s\n" % (header % b'local', b"\n ".join(u1))) |
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604 if u2: |
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605 repo.ui.debug(b"%s:\n %s\n" % (header % b'other', b"\n ".join(u2))) |
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606 |
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607 fullcopy = copies1.copy() |
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608 fullcopy.update(copies2) |
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609 if not fullcopy: |
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610 return copy, {}, diverge, renamedelete, {} |
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611 |
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612 if repo.ui.debugflag: |
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613 repo.ui.debug( |
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614 b" all copies found (* = to merge, ! = divergent, " |
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615 b"% = renamed and deleted):\n" |
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616 ) |
18362
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617 for f in sorted(fullcopy): |
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618 note = b"" |
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619 if f in copy: |
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620 note += b"*" |
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621 if f in divergeset: |
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622 note += b"!" |
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623 if f in renamedeleteset: |
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624 note += b"%" |
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625 repo.ui.debug( |
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626 b" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, note) |
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627 ) |
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628 del divergeset |
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629 |
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630 repo.ui.debug(b" checking for directory renames\n") |
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631 |
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632 # generate a directory move map |
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633 d1, d2 = c1.dirs(), c2.dirs() |
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634 invalid = set() |
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635 dirmove = {} |
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636 |
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637 # examine each file copy for a potential directory move, which is |
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|
638 # when all the files in a directory are moved to a new directory |
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639 for dst, src in pycompat.iteritems(fullcopy): |
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|
640 dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst) |
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641 if dsrc in invalid: |
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642 # already seen to be uninteresting |
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643 continue |
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644 elif dsrc in d1 and ddst in d1: |
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645 # directory wasn't entirely moved locally |
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646 invalid.add(dsrc) |
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647 elif dsrc in d2 and ddst in d2: |
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648 # directory wasn't entirely moved remotely |
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649 invalid.add(dsrc) |
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650 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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651 # files from the same directory moved to two different places |
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652 invalid.add(dsrc) |
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653 else: |
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654 # looks good so far |
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655 dirmove[dsrc] = ddst |
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656 |
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657 for i in invalid: |
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658 if i in dirmove: |
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659 del dirmove[i] |
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660 del d1, d2, invalid |
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661 |
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|
662 if not dirmove: |
30581
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Gábor Stefanik <gabor.stefanik@nng.com>
parents:
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diff
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663 return copy, {}, diverge, renamedelete, {} |
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664 |
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665 dirmove = {k + b"/": v + b"/" for k, v in pycompat.iteritems(dirmove)} |
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666 |
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667 for d in dirmove: |
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668 repo.ui.debug( |
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669 b" discovered dir src: '%s' -> dst: '%s'\n" % (d, dirmove[d]) |
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670 ) |
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671 |
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672 movewithdir = {} |
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673 # check unaccounted nonoverlapping files against directory moves |
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674 for f in u1 + u2: |
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675 if f not in fullcopy: |
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676 for d in dirmove: |
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677 if f.startswith(d): |
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678 # new file added in a directory that was moved, move it |
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679 df = dirmove[d] + f[len(d) :] |
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680 if df not in copy: |
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681 movewithdir[f] = df |
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682 repo.ui.debug( |
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683 b" pending file src: '%s' -> dst: '%s'\n" |
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684 % (f, df) |
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685 ) |
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686 break |
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687 |
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688 return copy, movewithdir, diverge, renamedelete, dirmove |
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689 |
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690 |
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691 def _heuristicscopytracing(repo, c1, c2, base): |
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692 """ Fast copytracing using filename heuristics |
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693 |
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694 Assumes that moves or renames are of following two types: |
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695 |
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696 1) Inside a directory only (same directory name but different filenames) |
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697 2) Move from one directory to another |
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698 (same filenames but different directory names) |
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699 |
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700 Works only when there are no merge commits in the "source branch". |
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701 Source branch is commits from base up to c2 not including base. |
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702 |
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703 If merge is involved it fallbacks to _fullcopytracing(). |
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704 |
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705 Can be used by setting the following config: |
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706 |
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707 [experimental] |
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708 copytrace = heuristics |
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709 |
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710 In some cases the copy/move candidates found by heuristics can be very large |
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711 in number and that will make the algorithm slow. The number of possible |
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712 candidates to check can be limited by using the config |
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713 `experimental.copytrace.movecandidateslimit` which defaults to 100. |
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714 """ |
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715 |
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716 if c1.rev() is None: |
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717 c1 = c1.p1() |
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718 if c2.rev() is None: |
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719 c2 = c2.p1() |
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720 |
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721 copies = {} |
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722 |
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723 changedfiles = set() |
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724 m1 = c1.manifest() |
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725 if not repo.revs(b'%d::%d', base.rev(), c2.rev()): |
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726 # If base is not in c2 branch, we switch to fullcopytracing |
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727 repo.ui.debug( |
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728 b"switching to full copytracing as base is not " |
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729 b"an ancestor of c2\n" |
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730 ) |
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731 return _fullcopytracing(repo, c1, c2, base) |
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732 |
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733 ctx = c2 |
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734 while ctx != base: |
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735 if len(ctx.parents()) == 2: |
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736 # To keep things simple let's not handle merges |
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737 repo.ui.debug(b"switching to full copytracing because of merges\n") |
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738 return _fullcopytracing(repo, c1, c2, base) |
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739 changedfiles.update(ctx.files()) |
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740 ctx = ctx.p1() |
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741 |
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742 cp = _forwardcopies(base, c2) |
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743 for dst, src in pycompat.iteritems(cp): |
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744 if src in m1: |
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745 copies[dst] = src |
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746 |
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747 # file is missing if it isn't present in the destination, but is present in |
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748 # the base and present in the source. |
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749 # Presence in the base is important to exclude added files, presence in the |
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750 # source is important to exclude removed files. |
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751 filt = lambda f: f not in m1 and f in base and f in c2 |
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752 missingfiles = [f for f in changedfiles if filt(f)] |
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753 |
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754 if missingfiles: |
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755 basenametofilename = collections.defaultdict(list) |
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756 dirnametofilename = collections.defaultdict(list) |
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757 |
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758 for f in m1.filesnotin(base.manifest()): |
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759 basename = os.path.basename(f) |
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760 dirname = os.path.dirname(f) |
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761 basenametofilename[basename].append(f) |
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762 dirnametofilename[dirname].append(f) |
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763 |
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764 for f in missingfiles: |
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765 basename = os.path.basename(f) |
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766 dirname = os.path.dirname(f) |
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767 samebasename = basenametofilename[basename] |
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768 samedirname = dirnametofilename[dirname] |
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769 movecandidates = samebasename + samedirname |
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770 # f is guaranteed to be present in c2, that's why |
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771 # c2.filectx(f) won't fail |
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772 f2 = c2.filectx(f) |
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773 # we can have a lot of candidates which can slow down the heuristics |
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774 # config value to limit the number of candidates moves to check |
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775 maxcandidates = repo.ui.configint( |
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776 b'experimental', b'copytrace.movecandidateslimit' |
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777 ) |
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778 |
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779 if len(movecandidates) > maxcandidates: |
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780 repo.ui.status( |
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781 _( |
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782 b"skipping copytracing for '%s', more " |
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783 b"candidates than the limit: %d\n" |
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784 ) |
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785 % (f, len(movecandidates)) |
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786 ) |
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787 continue |
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788 |
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789 for candidate in movecandidates: |
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790 f1 = c1.filectx(candidate) |
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791 if _related(f1, f2): |
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792 # if there are a few related copies then we'll merge |
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793 # changes into all of them. This matches the behaviour |
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794 # of upstream copytracing |
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795 copies[candidate] = f |
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796 |
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797 return copies, {}, {}, {}, {} |
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798 |
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799 |
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800 def _related(f1, f2): |
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801 """return True if f1 and f2 filectx have a common ancestor |
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802 |
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803 Walk back to common ancestor to see if the two files originate |
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804 from the same file. Since workingfilectx's rev() is None it messes |
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805 up the integer comparison logic, hence the pre-step check for |
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806 None (f1 and f2 can only be workingfilectx's initially). |
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807 """ |
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808 |
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809 if f1 == f2: |
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810 return True # a match |
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811 |
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812 g1, g2 = f1.ancestors(), f2.ancestors() |
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813 try: |
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814 f1r, f2r = f1.linkrev(), f2.linkrev() |
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815 |
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816 if f1r is None: |
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817 f1 = next(g1) |
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818 if f2r is None: |
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819 f2 = next(g2) |
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820 |
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821 while True: |
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822 f1r, f2r = f1.linkrev(), f2.linkrev() |
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823 if f1r > f2r: |
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824 f1 = next(g1) |
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825 elif f2r > f1r: |
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826 f2 = next(g2) |
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827 else: # f1 and f2 point to files in the same linkrev |
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828 return f1 == f2 # true if they point to the same file |
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829 except StopIteration: |
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830 return False |
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831 |
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832 |
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833 def duplicatecopies(repo, wctx, rev, fromrev, skiprev=None): |
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834 """reproduce copies from fromrev to rev in the dirstate |
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835 |
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836 If skiprev is specified, it's a revision that should be used to |
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837 filter copy records. Any copies that occur between fromrev and |
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838 skiprev will not be duplicated, even if they appear in the set of |
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839 copies between fromrev and rev. |
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840 """ |
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841 exclude = {} |
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842 ctraceconfig = repo.ui.config(b'experimental', b'copytrace') |
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843 bctrace = stringutil.parsebool(ctraceconfig) |
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844 if skiprev is not None and ( |
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845 ctraceconfig == b'heuristics' or bctrace or bctrace is None |
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846 ): |
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847 # copytrace='off' skips this line, but not the entire function because |
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848 # the line below is O(size of the repo) during a rebase, while the rest |
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849 # of the function is much faster (and is required for carrying copy |
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850 # metadata across the rebase anyway). |
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851 exclude = pathcopies(repo[fromrev], repo[skiprev]) |
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852 for dst, src in pycompat.iteritems(pathcopies(repo[fromrev], repo[rev])): |
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853 if dst in exclude: |
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854 continue |
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855 if dst in wctx: |
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856 wctx[dst].markcopied(src) |
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857 |
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858 |
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859 def computechangesetfilesadded(ctx): |
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860 """return the list of files added in a changeset |
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861 """ |
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862 added = [] |
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863 for f in ctx.files(): |
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864 if not any(f in p for p in ctx.parents()): |
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865 added.append(f) |
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866 return added |
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867 |
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868 |
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869 def computechangesetfilesremoved(ctx): |
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870 """return the list of files removed in a changeset |
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871 """ |
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872 removed = [] |
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873 for f in ctx.files(): |
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874 if f not in ctx: |
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875 removed.append(f) |
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876 return removed |
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877 |
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|
878 |
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879 def computechangesetcopies(ctx): |
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880 """return the copies data for a changeset |
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881 |
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882 The copies data are returned as a pair of dictionnary (p1copies, p2copies). |
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|
883 |
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884 Each dictionnary are in the form: `{newname: oldname}` |
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885 """ |
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886 p1copies = {} |
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887 p2copies = {} |
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888 p1 = ctx.p1() |
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889 p2 = ctx.p2() |
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890 narrowmatch = ctx._repo.narrowmatch() |
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891 for dst in ctx.files(): |
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892 if not narrowmatch(dst) or dst not in ctx: |
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893 continue |
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894 copied = ctx[dst].renamed() |
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895 if not copied: |
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896 continue |
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897 src, srcnode = copied |
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898 if src in p1 and p1[src].filenode() == srcnode: |
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899 p1copies[dst] = src |
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900 elif src in p2 and p2[src].filenode() == srcnode: |
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901 p2copies[dst] = src |
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902 return p1copies, p2copies |
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903 |
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904 |
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905 def encodecopies(files, copies): |
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906 items = [] |
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907 for i, dst in enumerate(files): |
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908 if dst in copies: |
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909 items.append(b'%d\0%s' % (i, copies[dst])) |
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910 if len(items) != len(copies): |
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911 raise error.ProgrammingError( |
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912 b'some copy targets missing from file list' |
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913 ) |
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914 return b"\n".join(items) |
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915 |
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916 |
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917 def decodecopies(files, data): |
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918 try: |
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919 copies = {} |
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920 if not data: |
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921 return copies |
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922 for l in data.split(b'\n'): |
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923 strindex, src = l.split(b'\0') |
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924 i = int(strindex) |
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925 dst = files[i] |
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926 copies[dst] = src |
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927 return copies |
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928 except (ValueError, IndexError): |
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929 # Perhaps someone had chosen the same key name (e.g. "p1copies") and |
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930 # used different syntax for the value. |
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931 return None |
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932 |
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933 |
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934 def encodefileindices(files, subset): |
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935 subset = set(subset) |
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936 indices = [] |
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937 for i, f in enumerate(files): |
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938 if f in subset: |
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939 indices.append(b'%d' % i) |
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940 return b'\n'.join(indices) |
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941 |
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942 |
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943 def decodefileindices(files, data): |
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944 try: |
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945 subset = [] |
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946 if not data: |
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947 return subset |
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948 for strindex in data.split(b'\n'): |
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949 i = int(strindex) |
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950 if i < 0 or i >= len(files): |
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951 return None |
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952 subset.append(files[i]) |
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953 return subset |
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954 except (ValueError, IndexError): |
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955 # Perhaps someone had chosen the same key name (e.g. "added") and |
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956 # used different syntax for the value. |
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957 return None |