Mercurial > hg
annotate mercurial/copies.py @ 26774:04ab2348efd1
parsers: correct type of temporary variables for dirstate tuple fields
These fields are defined as int. This eliminates the following warning
spotted by CC=clang CFLAGS='-Wall -Wextra -Wno-missing-field-initializers
-Wno-unused-parameter -Wshorten-64-to-32':
mercurial/parsers.c:625:29: warning: comparison of integers of different
signs: 'uint32_t' (aka 'unsigned int') and 'int' [-Wsign-compare]
if (state == 'n' && mtime == now) {
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 17 Oct 2015 23:14:13 +0900 |
parents | df66736a128e |
children | 1aee2ab0f902 |
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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 heapq |
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11 |
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12 from . import ( |
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13 pathutil, |
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14 util, |
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15 ) |
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16 |
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17 def _findlimit(repo, a, b): |
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18 """ |
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19 Find the last revision that needs to be checked to ensure that a full |
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20 transitive closure for file copies can be properly calculated. |
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21 Generally, this means finding the earliest revision number that's an |
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22 ancestor of a or b but not both, except when a or b is a direct descendent |
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23 of the other, in which case we can return the minimum revnum of a and b. |
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24 None if no such revision exists. |
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25 """ |
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26 |
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27 # basic idea: |
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28 # - mark a and b with different sides |
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29 # - if a parent's children are all on the same side, the parent is |
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30 # on that side, otherwise it is on no side |
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31 # - walk the graph in topological order with the help of a heap; |
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32 # - add unseen parents to side map |
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33 # - clear side of any parent that has children on different sides |
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34 # - track number of interesting revs that might still be on a side |
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35 # - track the lowest interesting rev seen |
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36 # - quit when interesting revs is zero |
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37 |
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38 cl = repo.changelog |
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39 working = len(cl) # pseudo rev for the working directory |
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40 if a is None: |
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41 a = working |
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42 if b is None: |
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43 b = working |
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44 |
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45 side = {a: -1, b: 1} |
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46 visit = [-a, -b] |
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47 heapq.heapify(visit) |
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48 interesting = len(visit) |
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49 hascommonancestor = False |
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50 limit = working |
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51 |
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52 while interesting: |
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53 r = -heapq.heappop(visit) |
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54 if r == working: |
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55 parents = [cl.rev(p) for p in repo.dirstate.parents()] |
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56 else: |
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57 parents = cl.parentrevs(r) |
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58 for p in parents: |
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59 if p < 0: |
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60 continue |
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61 if p not in side: |
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62 # first time we see p; add it to visit |
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63 side[p] = side[r] |
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64 if side[p]: |
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65 interesting += 1 |
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66 heapq.heappush(visit, -p) |
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67 elif side[p] and side[p] != side[r]: |
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68 # p was interesting but now we know better |
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69 side[p] = 0 |
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70 interesting -= 1 |
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71 hascommonancestor = True |
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72 if side[r]: |
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73 limit = r # lowest rev visited |
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74 interesting -= 1 |
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75 |
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76 if not hascommonancestor: |
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77 return None |
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78 |
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79 # Consider the following flow (see test-commit-amend.t under issue4405): |
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80 # 1/ File 'a0' committed |
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81 # 2/ File renamed from 'a0' to 'a1' in a new commit (call it 'a1') |
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82 # 3/ Move back to first commit |
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83 # 4/ Create a new commit via revert to contents of 'a1' (call it 'a1-amend') |
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84 # 5/ Rename file from 'a1' to 'a2' and commit --amend 'a1-msg' |
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85 # |
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86 # During the amend in step five, we will be in this state: |
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87 # |
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88 # @ 3 temporary amend commit for a1-amend |
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89 # | |
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90 # o 2 a1-amend |
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91 # | |
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92 # | o 1 a1 |
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93 # |/ |
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94 # o 0 a0 |
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95 # |
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96 # When _findlimit is called, a and b are revs 3 and 0, so limit will be 2, |
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97 # yet the filelog has the copy information in rev 1 and we will not look |
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98 # back far enough unless we also look at the a and b as candidates. |
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99 # This only occurs when a is a descendent of b or visa-versa. |
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100 return min(limit, a, b) |
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101 |
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102 def _chain(src, dst, a, b): |
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103 '''chain two sets of copies a->b''' |
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104 t = a.copy() |
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105 for k, v in b.iteritems(): |
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106 if v in t: |
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107 # found a chain |
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108 if t[v] != k: |
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109 # file wasn't renamed back to itself |
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110 t[k] = t[v] |
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111 if v not in dst: |
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112 # chain was a rename, not a copy |
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113 del t[v] |
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114 if v in src: |
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115 # file is a copy of an existing file |
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116 t[k] = v |
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117 |
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118 # remove criss-crossed copies |
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119 for k, v in t.items(): |
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120 if k in src and v in dst: |
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121 del t[k] |
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122 |
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123 return t |
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124 |
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125 def _tracefile(fctx, am, limit=-1): |
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126 '''return file context that is the ancestor of fctx present in ancestor |
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127 manifest am, stopping after the first ancestor lower than limit''' |
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128 |
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129 for f in fctx.ancestors(): |
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130 if am.get(f.path(), None) == f.filenode(): |
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131 return f |
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132 if limit >= 0 and f.linkrev() < limit and f.rev() < limit: |
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133 return None |
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134 |
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135 def _dirstatecopies(d): |
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136 ds = d._repo.dirstate |
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137 c = ds.copies().copy() |
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138 for k in c.keys(): |
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139 if ds[k] not in 'anm': |
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140 del c[k] |
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141 return c |
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142 |
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143 def _computeforwardmissing(a, b, match=None): |
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144 """Computes which files are in b but not a. |
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145 This is its own function so extensions can easily wrap this call to see what |
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146 files _forwardcopies is about to process. |
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147 """ |
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148 ma = a.manifest() |
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149 mb = b.manifest() |
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150 if match: |
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151 ma = ma.matches(match) |
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152 mb = mb.matches(match) |
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153 return mb.filesnotin(ma) |
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154 |
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155 def _forwardcopies(a, b, match=None): |
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156 '''find {dst@b: src@a} copy mapping where a is an ancestor of b''' |
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157 |
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158 # check for working copy |
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159 w = None |
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160 if b.rev() is None: |
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161 w = b |
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162 b = w.p1() |
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163 if a == b: |
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164 # short-circuit to avoid issues with merge states |
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165 return _dirstatecopies(w) |
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166 |
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167 # files might have to be traced back to the fctx parent of the last |
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168 # one-side-only changeset, but not further back than that |
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169 limit = _findlimit(a._repo, a.rev(), b.rev()) |
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170 if limit is None: |
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171 limit = -1 |
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172 am = a.manifest() |
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173 |
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174 # find where new files came from |
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175 # we currently don't try to find where old files went, too expensive |
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176 # this means we can miss a case like 'hg rm b; hg cp a b' |
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177 cm = {} |
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178 missing = _computeforwardmissing(a, b, match=match) |
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179 ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) |
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180 for f in missing: |
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181 fctx = b[f] |
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182 fctx._ancestrycontext = ancestrycontext |
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183 ofctx = _tracefile(fctx, am, limit) |
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184 if ofctx: |
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185 cm[f] = ofctx.path() |
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186 |
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187 # combine copies from dirstate if necessary |
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188 if w is not None: |
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189 cm = _chain(a, w, cm, _dirstatecopies(w)) |
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190 |
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191 return cm |
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192 |
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193 def _backwardrenames(a, b): |
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194 if a._repo.ui.configbool('experimental', 'disablecopytrace'): |
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195 return {} |
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196 |
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197 # Even though we're not taking copies into account, 1:n rename situations |
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198 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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199 # arbitrarily pick one of the renames. |
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200 f = _forwardcopies(b, a) |
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201 r = {} |
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202 for k, v in sorted(f.iteritems()): |
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203 # remove copies |
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204 if v in a: |
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205 continue |
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206 r[v] = k |
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207 return r |
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208 |
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209 def pathcopies(x, y, match=None): |
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210 '''find {dst@y: src@x} copy mapping for directed compare''' |
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211 if x == y or not x or not y: |
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212 return {} |
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213 a = y.ancestor(x) |
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214 if a == x: |
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215 return _forwardcopies(x, y, match=match) |
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216 if a == y: |
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217 return _backwardrenames(x, y) |
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218 return _chain(x, y, _backwardrenames(x, a), |
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219 _forwardcopies(a, y, match=match)) |
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220 |
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221 def _computenonoverlap(repo, c1, c2, addedinm1, addedinm2): |
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222 """Computes, based on addedinm1 and addedinm2, the files exclusive to c1 |
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223 and c2. This is its own function so extensions can easily wrap this call |
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224 to see what files mergecopies is about to process. |
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225 |
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226 Even though c1 and c2 are not used in this function, they are useful in |
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227 other extensions for being able to read the file nodes of the changed files. |
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228 """ |
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229 u1 = sorted(addedinm1 - addedinm2) |
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230 u2 = sorted(addedinm2 - addedinm1) |
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231 |
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232 if u1: |
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233 repo.ui.debug(" unmatched files in local:\n %s\n" |
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234 % "\n ".join(u1)) |
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235 if u2: |
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236 repo.ui.debug(" unmatched files in other:\n %s\n" |
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237 % "\n ".join(u2)) |
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238 return u1, u2 |
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239 |
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240 def _makegetfctx(ctx): |
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241 """return a 'getfctx' function suitable for checkcopies usage |
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242 |
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243 We have to re-setup the function building 'filectx' for each |
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244 'checkcopies' to ensure the linkrev adjustement is properly setup for |
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245 each. Linkrev adjustment is important to avoid bug in rename |
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246 detection. Moreover, having a proper '_ancestrycontext' setup ensures |
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247 the performance impact of this adjustment is kept limited. Without it, |
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248 each file could do a full dag traversal making the time complexity of |
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249 the operation explode (see issue4537). |
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250 |
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251 This function exists here mostly to limit the impact on stable. Feel |
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252 free to refactor on default. |
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253 """ |
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254 rev = ctx.rev() |
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255 repo = ctx._repo |
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256 ac = getattr(ctx, '_ancestrycontext', None) |
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257 if ac is None: |
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258 revs = [rev] |
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259 if rev is None: |
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260 revs = [p.rev() for p in ctx.parents()] |
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261 ac = repo.changelog.ancestors(revs, inclusive=True) |
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262 ctx._ancestrycontext = ac |
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263 def makectx(f, n): |
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264 if len(n) != 20: # in a working context? |
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265 if ctx.rev() is None: |
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266 return ctx.filectx(f) |
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267 return repo[None][f] |
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268 fctx = repo.filectx(f, fileid=n) |
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269 # setup only needed for filectx not create from a changectx |
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270 fctx._ancestrycontext = ac |
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271 fctx._descendantrev = rev |
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272 return fctx |
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273 return util.lrucachefunc(makectx) |
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274 |
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275 def mergecopies(repo, c1, c2, ca): |
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276 """ |
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277 Find moves and copies between context c1 and c2 that are relevant |
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278 for merging. |
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279 |
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280 Returns four dicts: "copy", "movewithdir", "diverge", and |
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281 "renamedelete". |
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282 |
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283 "copy" is a mapping from destination name -> source name, |
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284 where source is in c1 and destination is in c2 or vice-versa. |
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285 |
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286 "movewithdir" is a mapping from source name -> destination name, |
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287 where the file at source present in one context but not the other |
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288 needs to be moved to destination by the merge process, because the |
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289 other context moved the directory it is in. |
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290 |
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291 "diverge" is a mapping of source name -> list of destination names |
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292 for divergent renames. |
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293 |
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294 "renamedelete" is a mapping of source name -> list of destination |
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295 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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296 """ |
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297 # avoid silly behavior for update from empty dir |
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298 if not c1 or not c2 or c1 == c2: |
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299 return {}, {}, {}, {} |
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300 |
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301 # avoid silly behavior for parent -> working dir |
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302 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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303 return repo.dirstate.copies(), {}, {}, {} |
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304 |
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305 # Copy trace disabling is explicitly below the node == p1 logic above |
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306 # because the logic above is required for a simple copy to be kept across a |
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307 # rebase. |
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308 if repo.ui.configbool('experimental', 'disablecopytrace'): |
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309 return {}, {}, {}, {} |
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310 |
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311 limit = _findlimit(repo, c1.rev(), c2.rev()) |
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312 if limit is None: |
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313 # no common ancestor, no copies |
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314 return {}, {}, {}, {} |
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315 repo.ui.debug(" searching for copies back to rev %d\n" % limit) |
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316 |
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317 m1 = c1.manifest() |
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318 m2 = c2.manifest() |
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319 ma = ca.manifest() |
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320 |
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321 copy1, copy2, = {}, {} |
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322 movewithdir1, movewithdir2 = {}, {} |
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323 fullcopy1, fullcopy2 = {}, {} |
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324 diverge = {} |
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325 |
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326 # find interesting file sets from manifests |
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327 addedinm1 = m1.filesnotin(ma) |
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328 addedinm2 = m2.filesnotin(ma) |
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329 u1, u2 = _computenonoverlap(repo, c1, c2, addedinm1, addedinm2) |
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330 bothnew = sorted(addedinm1 & addedinm2) |
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331 |
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332 for f in u1: |
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333 checkcopies(c1, f, m1, m2, ca, limit, diverge, copy1, fullcopy1) |
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334 |
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335 for f in u2: |
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336 checkcopies(c2, f, m2, m1, ca, limit, diverge, copy2, fullcopy2) |
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337 |
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338 copy = dict(copy1.items() + copy2.items()) |
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339 movewithdir = dict(movewithdir1.items() + movewithdir2.items()) |
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340 fullcopy = dict(fullcopy1.items() + fullcopy2.items()) |
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341 |
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342 renamedelete = {} |
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343 renamedeleteset = set() |
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344 divergeset = set() |
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345 for of, fl in diverge.items(): |
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346 if len(fl) == 1 or of in c1 or of in c2: |
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347 del diverge[of] # not actually divergent, or not a rename |
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348 if of not in c1 and of not in c2: |
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349 # renamed on one side, deleted on the other side, but filter |
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350 # out files that have been renamed and then deleted |
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351 renamedelete[of] = [f for f in fl if f in c1 or f in c2] |
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352 renamedeleteset.update(fl) # reverse map for below |
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353 else: |
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354 divergeset.update(fl) # reverse map for below |
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355 |
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356 if bothnew: |
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357 repo.ui.debug(" unmatched files new in both:\n %s\n" |
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358 % "\n ".join(bothnew)) |
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359 bothdiverge, _copy, _fullcopy = {}, {}, {} |
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360 for f in bothnew: |
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361 checkcopies(c1, f, m1, m2, ca, limit, bothdiverge, _copy, _fullcopy) |
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362 checkcopies(c2, f, m2, m1, ca, limit, bothdiverge, _copy, _fullcopy) |
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363 for of, fl in bothdiverge.items(): |
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364 if len(fl) == 2 and fl[0] == fl[1]: |
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365 copy[fl[0]] = of # not actually divergent, just matching renames |
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366 |
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367 if fullcopy and repo.ui.debugflag: |
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368 repo.ui.debug(" all copies found (* = to merge, ! = divergent, " |
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369 "% = renamed and deleted):\n") |
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370 for f in sorted(fullcopy): |
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371 note = "" |
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372 if f in copy: |
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373 note += "*" |
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374 if f in divergeset: |
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375 note += "!" |
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376 if f in renamedeleteset: |
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377 note += "%" |
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378 repo.ui.debug(" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, |
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379 note)) |
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380 del divergeset |
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381 |
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382 if not fullcopy: |
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383 return copy, movewithdir, diverge, renamedelete |
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384 |
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do not attempt to translate ui.debug output
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385 repo.ui.debug(" checking for directory renames\n") |
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386 |
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387 # generate a directory move map |
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388 d1, d2 = c1.dirs(), c2.dirs() |
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389 # Hack for adding '', which is not otherwise added, to d1 and d2 |
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390 d1.addpath('/') |
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391 d2.addpath('/') |
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392 invalid = set() |
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393 dirmove = {} |
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394 |
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395 # examine each file copy for a potential directory move, which is |
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396 # when all the files in a directory are moved to a new directory |
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397 for dst, src in fullcopy.iteritems(): |
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398 dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst) |
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399 if dsrc in invalid: |
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400 # already seen to be uninteresting |
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401 continue |
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402 elif dsrc in d1 and ddst in d1: |
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403 # directory wasn't entirely moved locally |
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404 invalid.add(dsrc) |
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405 elif dsrc in d2 and ddst in d2: |
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406 # directory wasn't entirely moved remotely |
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407 invalid.add(dsrc) |
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408 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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409 # files from the same directory moved to two different places |
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410 invalid.add(dsrc) |
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411 else: |
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412 # looks good so far |
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413 dirmove[dsrc + "/"] = ddst + "/" |
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414 |
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415 for i in invalid: |
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416 if i in dirmove: |
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417 del dirmove[i] |
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418 del d1, d2, invalid |
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419 |
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420 if not dirmove: |
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421 return copy, movewithdir, diverge, renamedelete |
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422 |
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423 for d in dirmove: |
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424 repo.ui.debug(" discovered dir src: '%s' -> dst: '%s'\n" % |
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425 (d, dirmove[d])) |
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426 |
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427 # check unaccounted nonoverlapping files against directory moves |
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428 for f in u1 + u2: |
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429 if f not in fullcopy: |
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430 for d in dirmove: |
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431 if f.startswith(d): |
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432 # new file added in a directory that was moved, move it |
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433 df = dirmove[d] + f[len(d):] |
6426
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434 if df not in copy: |
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435 movewithdir[f] = df |
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436 repo.ui.debug((" pending file src: '%s' -> " |
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437 "dst: '%s'\n") % (f, df)) |
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438 break |
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439 |
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440 return copy, movewithdir, diverge, renamedelete |
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441 |
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442 def checkcopies(ctx, f, m1, m2, ca, limit, diverge, copy, fullcopy): |
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443 """ |
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444 check possible copies of f from m1 to m2 |
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445 |
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446 ctx = starting context for f in m1 |
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447 f = the filename to check |
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448 m1 = the source manifest |
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449 m2 = the destination manifest |
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450 ca = the changectx of the common ancestor |
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451 limit = the rev number to not search beyond |
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452 diverge = record all diverges in this dict |
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453 copy = record all non-divergent copies in this dict |
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454 fullcopy = record all copies in this dict |
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455 """ |
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456 |
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457 ma = ca.manifest() |
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458 getfctx = _makegetfctx(ctx) |
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459 |
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460 def _related(f1, f2, limit): |
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461 # Walk back to common ancestor to see if the two files originate |
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462 # from the same file. Since workingfilectx's rev() is None it messes |
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463 # up the integer comparison logic, hence the pre-step check for |
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464 # None (f1 and f2 can only be workingfilectx's initially). |
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465 |
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466 if f1 == f2: |
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467 return f1 # a match |
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468 |
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469 g1, g2 = f1.ancestors(), f2.ancestors() |
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470 try: |
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471 f1r, f2r = f1.linkrev(), f2.linkrev() |
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472 |
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473 if f1r is None: |
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474 f1 = g1.next() |
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475 if f2r is None: |
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476 f2 = g2.next() |
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477 |
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478 while True: |
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479 f1r, f2r = f1.linkrev(), f2.linkrev() |
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480 if f1r > f2r: |
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481 f1 = g1.next() |
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482 elif f2r > f1r: |
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483 f2 = g2.next() |
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484 elif f1 == f2: |
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485 return f1 # a match |
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486 elif f1r == f2r or f1r < limit or f2r < limit: |
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487 return False # copy no longer relevant |
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488 except StopIteration: |
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489 return False |
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490 |
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491 of = None |
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492 seen = set([f]) |
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493 for oc in getfctx(f, m1[f]).ancestors(): |
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494 ocr = oc.linkrev() |
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495 of = oc.path() |
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496 if of in seen: |
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497 # check limit late - grab last rename before |
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498 if ocr < limit: |
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499 break |
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500 continue |
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501 seen.add(of) |
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502 |
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503 fullcopy[f] = of # remember for dir rename detection |
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504 if of not in m2: |
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505 continue # no match, keep looking |
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506 if m2[of] == ma.get(of): |
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507 break # no merge needed, quit early |
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508 c2 = getfctx(of, m2[of]) |
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509 cr = _related(oc, c2, ca.rev()) |
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510 if cr and (of == f or of == c2.path()): # non-divergent |
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511 copy[f] = of |
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512 of = None |
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513 break |
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514 |
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515 if of in ma: |
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516 diverge.setdefault(of, []).append(f) |
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517 |
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518 def duplicatecopies(repo, rev, fromrev, skiprev=None): |
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519 '''reproduce copies from fromrev to rev in the dirstate |
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520 |
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521 If skiprev is specified, it's a revision that should be used to |
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522 filter copy records. Any copies that occur between fromrev and |
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523 skiprev will not be duplicated, even if they appear in the set of |
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524 copies between fromrev and rev. |
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525 ''' |
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526 exclude = {} |
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527 if (skiprev is not None and |
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528 not repo.ui.configbool('experimental', 'disablecopytrace')): |
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529 # disablecopytrace skips this line, but not the entire function because |
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530 # the line below is O(size of the repo) during a rebase, while the rest |
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531 # of the function is much faster (and is required for carrying copy |
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532 # metadata across the rebase anyway). |
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533 exclude = pathcopies(repo[fromrev], repo[skiprev]) |
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534 for dst, src in pathcopies(repo[fromrev], repo[rev]).iteritems(): |
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535 # copies.pathcopies returns backward renames, so dst might not |
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536 # actually be in the dirstate |
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537 if dst in exclude: |
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538 continue |
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539 if repo.dirstate[dst] in "nma": |
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540 repo.dirstate.copy(src, dst) |