Mercurial > hg
annotate mercurial/copies.py @ 20629:277dc5f27310
cmdserver: recreate mq object on runcommand in case queue path was changed
repo.mq needs to be recreated after queue path change. Since there is little
benefit to keep invalidated mq object, it always delete repo.mq.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Mon, 03 Mar 2014 19:41:30 +0900 |
parents | 243ea5ffdf31 |
children | 3db9e798e004 |
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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 import util |
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9 import heapq |
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10 |
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11 def _nonoverlap(d1, d2, d3): |
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12 "Return list of elements in d1 not in d2 or d3" |
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13 return sorted([d for d in d1 if d not in d3 and d not in d2]) |
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14 |
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15 def _dirname(f): |
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16 s = f.rfind("/") |
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17 if s == -1: |
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18 return "" |
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19 return f[:s] |
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20 |
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21 def _findlimit(repo, a, b): |
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22 """Find the earliest revision that's an ancestor of a or b but not both, |
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23 None if no such revision exists. |
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24 """ |
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25 # basic idea: |
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26 # - mark a and b with different sides |
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27 # - if a parent's children are all on the same side, the parent is |
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28 # on that side, otherwise it is on no side |
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29 # - walk the graph in topological order with the help of a heap; |
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30 # - add unseen parents to side map |
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31 # - clear side of any parent that has children on different sides |
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32 # - track number of interesting revs that might still be on a side |
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33 # - track the lowest interesting rev seen |
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34 # - quit when interesting revs is zero |
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35 |
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36 cl = repo.changelog |
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37 working = len(cl) # pseudo rev for the working directory |
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38 if a is None: |
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39 a = working |
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40 if b is None: |
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41 b = working |
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42 |
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43 side = {a: -1, b: 1} |
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44 visit = [-a, -b] |
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45 heapq.heapify(visit) |
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46 interesting = len(visit) |
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47 hascommonancestor = False |
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48 limit = working |
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49 |
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50 while interesting: |
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51 r = -heapq.heappop(visit) |
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52 if r == working: |
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53 parents = [cl.rev(p) for p in repo.dirstate.parents()] |
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54 else: |
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55 parents = cl.parentrevs(r) |
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56 for p in parents: |
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57 if p < 0: |
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58 continue |
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59 if p not in side: |
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60 # first time we see p; add it to visit |
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61 side[p] = side[r] |
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62 if side[p]: |
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63 interesting += 1 |
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64 heapq.heappush(visit, -p) |
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65 elif side[p] and side[p] != side[r]: |
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66 # p was interesting but now we know better |
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67 side[p] = 0 |
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68 interesting -= 1 |
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69 hascommonancestor = True |
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70 if side[r]: |
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71 limit = r # lowest rev visited |
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72 interesting -= 1 |
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73 |
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74 if not hascommonancestor: |
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75 return None |
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76 return limit |
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77 |
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78 def _chain(src, dst, a, b): |
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79 '''chain two sets of copies a->b''' |
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80 t = a.copy() |
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81 for k, v in b.iteritems(): |
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82 if v in t: |
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83 # found a chain |
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84 if t[v] != k: |
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85 # file wasn't renamed back to itself |
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86 t[k] = t[v] |
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87 if v not in dst: |
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88 # chain was a rename, not a copy |
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89 del t[v] |
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90 if v in src: |
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91 # file is a copy of an existing file |
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92 t[k] = v |
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93 |
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94 # remove criss-crossed copies |
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95 for k, v in t.items(): |
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96 if k in src and v in dst: |
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97 del t[k] |
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98 |
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99 return t |
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100 |
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101 def _tracefile(fctx, am, limit=-1): |
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102 '''return file context that is the ancestor of fctx present in ancestor |
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103 manifest am, stopping after the first ancestor lower than limit''' |
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104 |
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105 for f in fctx.ancestors(): |
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106 if am.get(f.path(), None) == f.filenode(): |
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107 return f |
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108 if f.rev() < limit: |
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109 return None |
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110 |
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111 def _dirstatecopies(d): |
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112 ds = d._repo.dirstate |
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113 c = ds.copies().copy() |
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114 for k in c.keys(): |
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115 if ds[k] not in 'anm': |
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116 del c[k] |
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117 return c |
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118 |
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119 def _forwardcopies(a, b): |
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120 '''find {dst@b: src@a} copy mapping where a is an ancestor of b''' |
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121 |
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122 # check for working copy |
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123 w = None |
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124 if b.rev() is None: |
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125 w = b |
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126 b = w.p1() |
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127 if a == b: |
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128 # short-circuit to avoid issues with merge states |
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129 return _dirstatecopies(w) |
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130 |
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131 # files might have to be traced back to the fctx parent of the last |
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132 # one-side-only changeset, but not further back than that |
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133 limit = _findlimit(a._repo, a.rev(), b.rev()) |
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134 if limit is None: |
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135 limit = -1 |
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136 am = a.manifest() |
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137 |
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138 # find where new files came from |
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139 # we currently don't try to find where old files went, too expensive |
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140 # this means we can miss a case like 'hg rm b; hg cp a b' |
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141 cm = {} |
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142 missing = set(b.manifest().iterkeys()) |
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143 missing.difference_update(a.manifest().iterkeys()) |
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144 |
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145 for f in missing: |
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146 ofctx = _tracefile(b[f], am, limit) |
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147 if ofctx: |
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148 cm[f] = ofctx.path() |
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149 |
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150 # combine copies from dirstate if necessary |
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151 if w is not None: |
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152 cm = _chain(a, w, cm, _dirstatecopies(w)) |
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153 |
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154 return cm |
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155 |
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156 def _backwardrenames(a, b): |
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157 # Even though we're not taking copies into account, 1:n rename situations |
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158 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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159 # arbitrarily pick one of the renames. |
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160 f = _forwardcopies(b, a) |
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161 r = {} |
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162 for k, v in sorted(f.iteritems()): |
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163 # remove copies |
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164 if v in a: |
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165 continue |
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166 r[v] = k |
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167 return r |
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168 |
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169 def pathcopies(x, y): |
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170 '''find {dst@y: src@x} copy mapping for directed compare''' |
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171 if x == y or not x or not y: |
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172 return {} |
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173 a = y.ancestor(x) |
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174 if a == x: |
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175 return _forwardcopies(x, y) |
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176 if a == y: |
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177 return _backwardrenames(x, y) |
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178 return _chain(x, y, _backwardrenames(x, a), _forwardcopies(a, y)) |
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179 |
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180 def mergecopies(repo, c1, c2, ca): |
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181 """ |
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182 Find moves and copies between context c1 and c2 that are relevant |
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183 for merging. |
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184 |
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185 Returns four dicts: "copy", "movewithdir", "diverge", and |
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186 "renamedelete". |
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187 |
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188 "copy" is a mapping from destination name -> source name, |
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189 where source is in c1 and destination is in c2 or vice-versa. |
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190 |
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191 "movewithdir" is a mapping from source name -> destination name, |
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192 where the file at source present in one context but not the other |
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193 needs to be moved to destination by the merge process, because the |
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194 other context moved the directory it is in. |
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195 |
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196 "diverge" is a mapping of source name -> list of destination names |
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197 for divergent renames. |
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198 |
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199 "renamedelete" is a mapping of source name -> list of destination |
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200 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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201 """ |
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202 # avoid silly behavior for update from empty dir |
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203 if not c1 or not c2 or c1 == c2: |
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204 return {}, {}, {}, {} |
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205 |
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206 # avoid silly behavior for parent -> working dir |
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207 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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208 return repo.dirstate.copies(), {}, {}, {} |
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209 |
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210 limit = _findlimit(repo, c1.rev(), c2.rev()) |
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211 if limit is None: |
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212 # no common ancestor, no copies |
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213 return {}, {}, {}, {} |
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214 m1 = c1.manifest() |
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215 m2 = c2.manifest() |
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216 ma = ca.manifest() |
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217 |
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218 def makectx(f, n): |
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219 if len(n) != 20: # in a working context? |
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220 if c1.rev() is None: |
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221 return c1.filectx(f) |
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222 return c2.filectx(f) |
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223 return repo.filectx(f, fileid=n) |
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224 |
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225 ctx = util.lrucachefunc(makectx) |
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226 copy = {} |
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227 movewithdir = {} |
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228 fullcopy = {} |
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229 diverge = {} |
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230 |
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231 def _checkcopies(f, m1, m2): |
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232 checkcopies(ctx, f, m1, m2, ca, limit, diverge, copy, fullcopy) |
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233 |
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234 repo.ui.debug(" searching for copies back to rev %d\n" % limit) |
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235 |
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236 u1 = _nonoverlap(m1, m2, ma) |
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237 u2 = _nonoverlap(m2, m1, ma) |
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238 |
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239 if u1: |
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240 repo.ui.debug(" unmatched files in local:\n %s\n" |
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241 % "\n ".join(u1)) |
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242 if u2: |
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243 repo.ui.debug(" unmatched files in other:\n %s\n" |
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244 % "\n ".join(u2)) |
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245 |
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246 for f in u1: |
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247 _checkcopies(f, m1, m2) |
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248 for f in u2: |
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249 _checkcopies(f, m2, m1) |
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250 |
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251 renamedelete = {} |
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252 renamedelete2 = set() |
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253 diverge2 = set() |
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254 for of, fl in diverge.items(): |
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255 if len(fl) == 1 or of in c1 or of in c2: |
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256 del diverge[of] # not actually divergent, or not a rename |
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257 if of not in c1 and of not in c2: |
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258 # renamed on one side, deleted on the other side, but filter |
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259 # out files that have been renamed and then deleted |
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260 renamedelete[of] = [f for f in fl if f in c1 or f in c2] |
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261 renamedelete2.update(fl) # reverse map for below |
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262 else: |
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263 diverge2.update(fl) # reverse map for below |
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264 |
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265 if fullcopy: |
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266 repo.ui.debug(" all copies found (* = to merge, ! = divergent, " |
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267 "% = renamed and deleted):\n") |
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268 for f in sorted(fullcopy): |
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269 note = "" |
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270 if f in copy: |
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271 note += "*" |
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272 if f in diverge2: |
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273 note += "!" |
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274 if f in renamedelete2: |
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275 note += "%" |
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276 repo.ui.debug(" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, |
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277 note)) |
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278 del diverge2 |
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279 |
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280 if not fullcopy: |
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281 return copy, movewithdir, diverge, renamedelete |
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282 |
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283 repo.ui.debug(" checking for directory renames\n") |
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284 |
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285 # generate a directory move map |
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286 d1, d2 = c1.dirs(), c2.dirs() |
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287 d1.addpath('/') |
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288 d2.addpath('/') |
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289 invalid = set() |
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290 dirmove = {} |
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291 |
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292 # examine each file copy for a potential directory move, which is |
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293 # when all the files in a directory are moved to a new directory |
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294 for dst, src in fullcopy.iteritems(): |
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295 dsrc, ddst = _dirname(src), _dirname(dst) |
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296 if dsrc in invalid: |
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297 # already seen to be uninteresting |
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298 continue |
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299 elif dsrc in d1 and ddst in d1: |
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300 # directory wasn't entirely moved locally |
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301 invalid.add(dsrc) |
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302 elif dsrc in d2 and ddst in d2: |
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303 # directory wasn't entirely moved remotely |
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304 invalid.add(dsrc) |
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305 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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306 # files from the same directory moved to two different places |
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307 invalid.add(dsrc) |
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308 else: |
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309 # looks good so far |
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310 dirmove[dsrc + "/"] = ddst + "/" |
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311 |
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312 for i in invalid: |
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313 if i in dirmove: |
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314 del dirmove[i] |
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315 del d1, d2, invalid |
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316 |
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317 if not dirmove: |
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318 return copy, movewithdir, diverge, renamedelete |
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319 |
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320 for d in dirmove: |
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321 repo.ui.debug(" discovered dir src: '%s' -> dst: '%s'\n" % |
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322 (d, dirmove[d])) |
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323 |
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324 # check unaccounted nonoverlapping files against directory moves |
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325 for f in u1 + u2: |
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326 if f not in fullcopy: |
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327 for d in dirmove: |
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328 if f.startswith(d): |
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329 # new file added in a directory that was moved, move it |
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330 df = dirmove[d] + f[len(d):] |
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331 if df not in copy: |
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332 movewithdir[f] = df |
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333 repo.ui.debug((" pending file src: '%s' -> " |
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334 "dst: '%s'\n") % (f, df)) |
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335 break |
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336 |
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337 return copy, movewithdir, diverge, renamedelete |
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338 |
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339 def checkcopies(ctx, f, m1, m2, ca, limit, diverge, copy, fullcopy): |
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340 """ |
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341 check possible copies of f from m1 to m2 |
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342 |
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343 ctx = function accepting (filename, node) that returns a filectx. |
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344 f = the filename to check |
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345 m1 = the source manifest |
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346 m2 = the destination manifest |
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347 ca = the changectx of the common ancestor |
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348 limit = the rev number to not search beyond |
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349 diverge = record all diverges in this dict |
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350 copy = record all non-divergent copies in this dict |
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351 fullcopy = record all copies in this dict |
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352 """ |
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353 |
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354 ma = ca.manifest() |
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355 |
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356 def _related(f1, f2, limit): |
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357 # Walk back to common ancestor to see if the two files originate |
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358 # from the same file. Since workingfilectx's rev() is None it messes |
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359 # up the integer comparison logic, hence the pre-step check for |
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360 # None (f1 and f2 can only be workingfilectx's initially). |
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361 |
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362 if f1 == f2: |
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363 return f1 # a match |
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364 |
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365 g1, g2 = f1.ancestors(), f2.ancestors() |
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366 try: |
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367 f1r, f2r = f1.rev(), f2.rev() |
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368 |
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369 if f1r is None: |
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370 f1 = g1.next() |
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371 if f2r is None: |
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372 f2 = g2.next() |
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373 |
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374 while True: |
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375 f1r, f2r = f1.rev(), f2.rev() |
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376 if f1r > f2r: |
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377 f1 = g1.next() |
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378 elif f2r > f1r: |
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379 f2 = g2.next() |
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380 elif f1 == f2: |
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381 return f1 # a match |
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382 elif f1r == f2r or f1r < limit or f2r < limit: |
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383 return False # copy no longer relevant |
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384 except StopIteration: |
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385 return False |
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386 |
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387 of = None |
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388 seen = set([f]) |
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389 for oc in ctx(f, m1[f]).ancestors(): |
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390 ocr = oc.rev() |
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391 of = oc.path() |
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392 if of in seen: |
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393 # check limit late - grab last rename before |
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394 if ocr < limit: |
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395 break |
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396 continue |
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397 seen.add(of) |
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398 |
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399 fullcopy[f] = of # remember for dir rename detection |
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400 if of not in m2: |
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401 continue # no match, keep looking |
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402 if m2[of] == ma.get(of): |
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403 break # no merge needed, quit early |
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404 c2 = ctx(of, m2[of]) |
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405 cr = _related(oc, c2, ca.rev()) |
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406 if cr and (of == f or of == c2.path()): # non-divergent |
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407 copy[f] = of |
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408 of = None |
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409 break |
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410 |
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411 if of in ma: |
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412 diverge.setdefault(of, []).append(f) |