Mercurial > hg
annotate mercurial/copies.py @ 24412:9372180b8c9b stable
mergecopies: reuse ancestry context when traversing file history (issue4537)
Merge copies is traversing file history in search for copies and renames.
Since 3.3 we are doing "linkrev adjustment" to ensure duplicated filelog entry
does not confuse the traversal. This "linkrev adjustment" involved ancestry
testing and walking in the changeset graph. If we do such walk in the changesets
graph for each file, we end up with a 'O(<changesets>x<files>)' complexity
that create massive issue. For examples, grafting a changeset in Mozilla's repo
moved from 6 seconds to more than 3 minutes.
There is a mechanism to reuse such ancestors computation between all files. But
it has to be manually set up in situation were it make sense to take such
shortcut. This changesets set this mechanism up and bring back the graph time
from 3 minutes to 8 seconds.
To do so, we need a bigger control on the way 'filectx' are instantiated during
each 'checkcopies' calls that 'mergecopies' is doing. We add a new 'setupctx'
that configure and return a 'filectx' factory. The function make sure the
ancestry context is properly created and the factory make sure it is properly
installed on returned 'filectx'.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Fri, 20 Mar 2015 00:30:35 -0700 |
parents | 751d1138ce35 |
children | 1cfded2fa1a9 |
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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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separate import lines from mercurial and general python modules
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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 """ |
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23 Find the last revision that needs to be checked to ensure that a full |
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24 transitive closure for file copies can be properly calculated. |
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25 Generally, this means finding the earliest revision number that's an |
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26 ancestor of a or b but not both, except when a or b is a direct descendent |
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27 of the other, in which case we can return the minimum revnum of a and b. |
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28 None if no such revision exists. |
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29 """ |
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30 |
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31 # basic idea: |
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32 # - mark a and b with different sides |
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33 # - if a parent's children are all on the same side, the parent is |
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34 # on that side, otherwise it is on no side |
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35 # - walk the graph in topological order with the help of a heap; |
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36 # - add unseen parents to side map |
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37 # - clear side of any parent that has children on different sides |
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38 # - track number of interesting revs that might still be on a side |
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39 # - track the lowest interesting rev seen |
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40 # - quit when interesting revs is zero |
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41 |
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42 cl = repo.changelog |
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43 working = len(cl) # pseudo rev for the working directory |
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44 if a is None: |
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45 a = working |
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46 if b is None: |
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47 b = working |
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48 |
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49 side = {a: -1, b: 1} |
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50 visit = [-a, -b] |
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51 heapq.heapify(visit) |
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52 interesting = len(visit) |
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53 hascommonancestor = False |
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54 limit = working |
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55 |
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56 while interesting: |
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57 r = -heapq.heappop(visit) |
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58 if r == working: |
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59 parents = [cl.rev(p) for p in repo.dirstate.parents()] |
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60 else: |
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61 parents = cl.parentrevs(r) |
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62 for p in parents: |
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63 if p < 0: |
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64 continue |
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65 if p not in side: |
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66 # first time we see p; add it to visit |
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67 side[p] = side[r] |
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68 if side[p]: |
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69 interesting += 1 |
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70 heapq.heappush(visit, -p) |
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71 elif side[p] and side[p] != side[r]: |
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72 # p was interesting but now we know better |
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73 side[p] = 0 |
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74 interesting -= 1 |
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75 hascommonancestor = True |
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76 if side[r]: |
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77 limit = r # lowest rev visited |
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78 interesting -= 1 |
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79 |
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80 if not hascommonancestor: |
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81 return None |
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82 |
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83 # Consider the following flow (see test-commit-amend.t under issue4405): |
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84 # 1/ File 'a0' committed |
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85 # 2/ File renamed from 'a0' to 'a1' in a new commit (call it 'a1') |
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86 # 3/ Move back to first commit |
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87 # 4/ Create a new commit via revert to contents of 'a1' (call it 'a1-amend') |
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88 # 5/ Rename file from 'a1' to 'a2' and commit --amend 'a1-msg' |
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89 # |
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90 # During the amend in step five, we will be in this state: |
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91 # |
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92 # @ 3 temporary amend commit for a1-amend |
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93 # | |
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94 # o 2 a1-amend |
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95 # | |
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96 # | o 1 a1 |
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97 # |/ |
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98 # o 0 a0 |
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99 # |
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100 # When _findlimit is called, a and b are revs 3 and 0, so limit will be 2, |
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101 # yet the filelog has the copy information in rev 1 and we will not look |
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102 # back far enough unless we also look at the a and b as candidates. |
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103 # This only occurs when a is a descendent of b or visa-versa. |
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104 return min(limit, a, b) |
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105 |
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106 def _chain(src, dst, a, b): |
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107 '''chain two sets of copies a->b''' |
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108 t = a.copy() |
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109 for k, v in b.iteritems(): |
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110 if v in t: |
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111 # found a chain |
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112 if t[v] != k: |
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113 # file wasn't renamed back to itself |
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114 t[k] = t[v] |
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115 if v not in dst: |
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116 # chain was a rename, not a copy |
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117 del t[v] |
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118 if v in src: |
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119 # file is a copy of an existing file |
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120 t[k] = v |
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121 |
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122 # remove criss-crossed copies |
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123 for k, v in t.items(): |
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124 if k in src and v in dst: |
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125 del t[k] |
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126 |
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127 return t |
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128 |
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129 def _tracefile(fctx, am, limit=-1): |
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130 '''return file context that is the ancestor of fctx present in ancestor |
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131 manifest am, stopping after the first ancestor lower than limit''' |
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132 |
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133 for f in fctx.ancestors(): |
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134 if am.get(f.path(), None) == f.filenode(): |
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135 return f |
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136 if limit >= 0 and f.linkrev() < limit and f.rev() < limit: |
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137 return None |
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138 |
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139 def _dirstatecopies(d): |
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140 ds = d._repo.dirstate |
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141 c = ds.copies().copy() |
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142 for k in c.keys(): |
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143 if ds[k] not in 'anm': |
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144 del c[k] |
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145 return c |
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146 |
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147 def _forwardcopies(a, b): |
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148 '''find {dst@b: src@a} copy mapping where a is an ancestor of b''' |
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149 |
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150 # check for working copy |
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151 w = None |
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152 if b.rev() is None: |
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153 w = b |
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154 b = w.p1() |
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155 if a == b: |
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156 # short-circuit to avoid issues with merge states |
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157 return _dirstatecopies(w) |
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158 |
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159 # files might have to be traced back to the fctx parent of the last |
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160 # one-side-only changeset, but not further back than that |
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161 limit = _findlimit(a._repo, a.rev(), b.rev()) |
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162 if limit is None: |
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163 limit = -1 |
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164 am = a.manifest() |
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165 |
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166 # find where new files came from |
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167 # we currently don't try to find where old files went, too expensive |
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168 # this means we can miss a case like 'hg rm b; hg cp a b' |
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169 cm = {} |
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170 missing = set(b.manifest().iterkeys()) |
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171 missing.difference_update(a.manifest().iterkeys()) |
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172 |
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173 ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) |
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174 for f in missing: |
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175 fctx = b[f] |
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176 fctx._ancestrycontext = ancestrycontext |
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177 ofctx = _tracefile(fctx, am, limit) |
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178 if ofctx: |
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179 cm[f] = ofctx.path() |
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180 |
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181 # combine copies from dirstate if necessary |
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182 if w is not None: |
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183 cm = _chain(a, w, cm, _dirstatecopies(w)) |
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184 |
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185 return cm |
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186 |
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187 def _backwardrenames(a, b): |
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188 # Even though we're not taking copies into account, 1:n rename situations |
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189 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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190 # arbitrarily pick one of the renames. |
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191 f = _forwardcopies(b, a) |
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192 r = {} |
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193 for k, v in sorted(f.iteritems()): |
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194 # remove copies |
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195 if v in a: |
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196 continue |
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197 r[v] = k |
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198 return r |
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199 |
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200 def pathcopies(x, y): |
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201 '''find {dst@y: src@x} copy mapping for directed compare''' |
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202 if x == y or not x or not y: |
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203 return {} |
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204 a = y.ancestor(x) |
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205 if a == x: |
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206 return _forwardcopies(x, y) |
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207 if a == y: |
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208 return _backwardrenames(x, y) |
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209 return _chain(x, y, _backwardrenames(x, a), _forwardcopies(a, y)) |
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210 |
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211 def mergecopies(repo, c1, c2, ca): |
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212 """ |
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213 Find moves and copies between context c1 and c2 that are relevant |
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214 for merging. |
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215 |
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216 Returns four dicts: "copy", "movewithdir", "diverge", and |
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217 "renamedelete". |
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218 |
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219 "copy" is a mapping from destination name -> source name, |
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220 where source is in c1 and destination is in c2 or vice-versa. |
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221 |
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222 "movewithdir" is a mapping from source name -> destination name, |
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223 where the file at source present in one context but not the other |
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224 needs to be moved to destination by the merge process, because the |
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225 other context moved the directory it is in. |
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226 |
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227 "diverge" is a mapping of source name -> list of destination names |
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228 for divergent renames. |
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229 |
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230 "renamedelete" is a mapping of source name -> list of destination |
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231 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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232 """ |
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233 # avoid silly behavior for update from empty dir |
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234 if not c1 or not c2 or c1 == c2: |
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235 return {}, {}, {}, {} |
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236 |
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237 # avoid silly behavior for parent -> working dir |
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238 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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239 return repo.dirstate.copies(), {}, {}, {} |
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240 |
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241 limit = _findlimit(repo, c1.rev(), c2.rev()) |
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242 if limit is None: |
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243 # no common ancestor, no copies |
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244 return {}, {}, {}, {} |
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245 m1 = c1.manifest() |
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246 m2 = c2.manifest() |
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247 ma = ca.manifest() |
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248 |
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249 |
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250 def setupctx(ctx): |
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251 """return a 'makectx' function suitable for checkcopies usage from ctx |
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252 |
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253 We have to re-setup the function building 'filectx' for each |
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254 'checkcopies' to ensure the linkrev adjustement is properly setup for |
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255 each. Linkrev adjustment is important to avoid bug in rename |
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256 detection. Moreover, having a proper '_ancestrycontext' setup ensures |
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257 the performance impact of this adjustment is kept limited. Without it, |
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258 each file could do a full dag traversal making the time complexity of |
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259 the operation explode (see issue4537). |
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260 |
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261 This function exists here mostly to limit the impact on stable. Feel |
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262 free to refactor on default. |
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263 """ |
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264 rev = ctx.rev() |
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265 ac = getattr(ctx, '_ancestrycontext', None) |
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266 if ac is None: |
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267 revs = [rev] |
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268 if rev is None: |
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269 revs = [p.rev() for p in ctx.parents()] |
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270 ac = ctx._repo.changelog.ancestors(revs, inclusive=True) |
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271 ctx._ancestrycontext = ac |
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272 def makectx(f, n): |
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273 if len(n) != 20: # in a working context? |
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274 if c1.rev() is None: |
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275 return c1.filectx(f) |
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276 return c2.filectx(f) |
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277 fctx = repo.filectx(f, fileid=n) |
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278 # setup only needed for filectx not create from a changectx |
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279 fctx._ancestrycontext = ac |
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280 fctx._descendantrev = rev |
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281 return fctx |
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282 return util.lrucachefunc(makectx) |
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283 |
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284 copy = {} |
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285 movewithdir = {} |
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286 fullcopy = {} |
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287 diverge = {} |
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288 |
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289 repo.ui.debug(" searching for copies back to rev %d\n" % limit) |
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290 |
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291 u1 = _nonoverlap(m1, m2, ma) |
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292 u2 = _nonoverlap(m2, m1, ma) |
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293 |
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294 if u1: |
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295 repo.ui.debug(" unmatched files in local:\n %s\n" |
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296 % "\n ".join(u1)) |
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297 if u2: |
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298 repo.ui.debug(" unmatched files in other:\n %s\n" |
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299 % "\n ".join(u2)) |
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300 |
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301 for f in u1: |
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302 ctx = setupctx(c1) |
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303 checkcopies(ctx, f, m1, m2, ca, limit, diverge, copy, fullcopy) |
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304 |
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305 for f in u2: |
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306 ctx = setupctx(c2) |
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307 checkcopies(ctx, f, m2, m1, ca, limit, diverge, copy, fullcopy) |
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308 |
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309 renamedelete = {} |
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310 renamedelete2 = set() |
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311 diverge2 = set() |
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312 for of, fl in diverge.items(): |
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313 if len(fl) == 1 or of in c1 or of in c2: |
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314 del diverge[of] # not actually divergent, or not a rename |
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315 if of not in c1 and of not in c2: |
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316 # renamed on one side, deleted on the other side, but filter |
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317 # out files that have been renamed and then deleted |
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318 renamedelete[of] = [f for f in fl if f in c1 or f in c2] |
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319 renamedelete2.update(fl) # reverse map for below |
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320 else: |
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321 diverge2.update(fl) # reverse map for below |
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322 |
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323 bothnew = sorted([d for d in m1 if d in m2 and d not in ma]) |
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324 if bothnew: |
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325 repo.ui.debug(" unmatched files new in both:\n %s\n" |
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326 % "\n ".join(bothnew)) |
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327 bothdiverge, _copy, _fullcopy = {}, {}, {} |
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328 for f in bothnew: |
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329 ctx = setupctx(c1) |
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330 checkcopies(ctx, f, m1, m2, ca, limit, bothdiverge, _copy, _fullcopy) |
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331 ctx = setupctx(c2) |
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332 checkcopies(ctx, f, m2, m1, ca, limit, bothdiverge, _copy, _fullcopy) |
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333 for of, fl in bothdiverge.items(): |
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334 if len(fl) == 2 and fl[0] == fl[1]: |
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335 copy[fl[0]] = of # not actually divergent, just matching renames |
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336 |
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337 if fullcopy and repo.ui.debugflag: |
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338 repo.ui.debug(" all copies found (* = to merge, ! = divergent, " |
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339 "% = renamed and deleted):\n") |
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340 for f in sorted(fullcopy): |
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341 note = "" |
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342 if f in copy: |
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343 note += "*" |
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344 if f in diverge2: |
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345 note += "!" |
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346 if f in renamedelete2: |
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347 note += "%" |
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348 repo.ui.debug(" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, |
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349 note)) |
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350 del diverge2 |
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351 |
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352 if not fullcopy: |
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353 return copy, movewithdir, diverge, renamedelete |
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354 |
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355 repo.ui.debug(" checking for directory renames\n") |
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356 |
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357 # generate a directory move map |
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358 d1, d2 = c1.dirs(), c2.dirs() |
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359 d1.addpath('/') |
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360 d2.addpath('/') |
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361 invalid = set() |
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362 dirmove = {} |
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363 |
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364 # examine each file copy for a potential directory move, which is |
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365 # when all the files in a directory are moved to a new directory |
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366 for dst, src in fullcopy.iteritems(): |
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367 dsrc, ddst = _dirname(src), _dirname(dst) |
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368 if dsrc in invalid: |
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369 # already seen to be uninteresting |
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370 continue |
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371 elif dsrc in d1 and ddst in d1: |
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372 # directory wasn't entirely moved locally |
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373 invalid.add(dsrc) |
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374 elif dsrc in d2 and ddst in d2: |
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375 # directory wasn't entirely moved remotely |
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376 invalid.add(dsrc) |
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377 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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378 # files from the same directory moved to two different places |
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379 invalid.add(dsrc) |
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380 else: |
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381 # looks good so far |
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382 dirmove[dsrc + "/"] = ddst + "/" |
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383 |
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384 for i in invalid: |
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385 if i in dirmove: |
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386 del dirmove[i] |
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387 del d1, d2, invalid |
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388 |
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389 if not dirmove: |
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390 return copy, movewithdir, diverge, renamedelete |
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391 |
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392 for d in dirmove: |
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393 repo.ui.debug(" discovered dir src: '%s' -> dst: '%s'\n" % |
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394 (d, dirmove[d])) |
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395 |
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396 # check unaccounted nonoverlapping files against directory moves |
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397 for f in u1 + u2: |
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398 if f not in fullcopy: |
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399 for d in dirmove: |
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400 if f.startswith(d): |
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401 # new file added in a directory that was moved, move it |
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402 df = dirmove[d] + f[len(d):] |
6426
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403 if df not in copy: |
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404 movewithdir[f] = df |
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405 repo.ui.debug((" pending file src: '%s' -> " |
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406 "dst: '%s'\n") % (f, df)) |
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407 break |
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408 |
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409 return copy, movewithdir, diverge, renamedelete |
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410 |
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411 def checkcopies(ctx, f, m1, m2, ca, limit, diverge, copy, fullcopy): |
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412 """ |
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413 check possible copies of f from m1 to m2 |
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414 |
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415 ctx = function accepting (filename, node) that returns a filectx. |
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416 f = the filename to check |
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417 m1 = the source manifest |
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418 m2 = the destination manifest |
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419 ca = the changectx of the common ancestor |
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420 limit = the rev number to not search beyond |
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421 diverge = record all diverges in this dict |
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422 copy = record all non-divergent copies in this dict |
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423 fullcopy = record all copies in this dict |
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424 """ |
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425 |
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426 ma = ca.manifest() |
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427 |
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428 def _related(f1, f2, limit): |
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429 # Walk back to common ancestor to see if the two files originate |
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430 # from the same file. Since workingfilectx's rev() is None it messes |
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431 # up the integer comparison logic, hence the pre-step check for |
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432 # None (f1 and f2 can only be workingfilectx's initially). |
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433 |
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434 if f1 == f2: |
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435 return f1 # a match |
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436 |
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437 g1, g2 = f1.ancestors(), f2.ancestors() |
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438 try: |
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439 f1r, f2r = f1.rev(), f2.rev() |
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440 |
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441 if f1r is None: |
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442 f1 = g1.next() |
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443 if f2r is None: |
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444 f2 = g2.next() |
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445 |
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446 while True: |
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447 f1r, f2r = f1.rev(), f2.rev() |
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448 if f1r > f2r: |
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449 f1 = g1.next() |
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450 elif f2r > f1r: |
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451 f2 = g2.next() |
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452 elif f1 == f2: |
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453 return f1 # a match |
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454 elif f1r == f2r or f1r < limit or f2r < limit: |
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455 return False # copy no longer relevant |
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456 except StopIteration: |
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457 return False |
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458 |
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459 of = None |
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460 seen = set([f]) |
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461 for oc in ctx(f, m1[f]).ancestors(): |
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462 ocr = oc.rev() |
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463 of = oc.path() |
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464 if of in seen: |
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465 # check limit late - grab last rename before |
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466 if ocr < limit: |
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467 break |
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468 continue |
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469 seen.add(of) |
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470 |
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471 fullcopy[f] = of # remember for dir rename detection |
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472 if of not in m2: |
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473 continue # no match, keep looking |
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474 if m2[of] == ma.get(of): |
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475 break # no merge needed, quit early |
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476 c2 = ctx(of, m2[of]) |
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477 cr = _related(oc, c2, ca.rev()) |
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478 if cr and (of == f or of == c2.path()): # non-divergent |
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479 copy[f] = of |
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480 of = None |
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481 break |
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482 |
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483 if of in ma: |
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484 diverge.setdefault(of, []).append(f) |
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485 |
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486 def duplicatecopies(repo, rev, fromrev, skiprev=None): |
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487 '''reproduce copies from fromrev to rev in the dirstate |
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488 |
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489 If skiprev is specified, it's a revision that should be used to |
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490 filter copy records. Any copies that occur between fromrev and |
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491 skiprev will not be duplicated, even if they appear in the set of |
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492 copies between fromrev and rev. |
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493 ''' |
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494 exclude = {} |
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495 if skiprev is not None: |
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496 exclude = pathcopies(repo[fromrev], repo[skiprev]) |
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497 for dst, src in pathcopies(repo[fromrev], repo[rev]).iteritems(): |
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498 # copies.pathcopies returns backward renames, so dst might not |
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499 # actually be in the dirstate |
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500 if dst in exclude: |
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501 continue |
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502 if repo.dirstate[dst] in "nma": |
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503 repo.dirstate.copy(src, dst) |