Mercurial > hg
annotate mercurial/copies.py @ 24019:26fbf07482b2
_fm1readmarkers: generate list in C
This moves perfloadmarkers from
! result: 63866
! wall 0.239217 comb 0.250000 user 0.240000 sys 0.010000 (best of 42)
to
! result: 63866
! wall 0.218795 comb 0.210000 user 0.210000 sys 0.000000 (best of 46)
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Tue, 27 Jan 2015 09:22:59 -0500 |
parents | d7d08337b3f6 |
children | cd66080ef6d4 |
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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 _computeforwardmissing(a, b): |
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148 """Computes which files are in b but not a. |
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149 This is its own function so extensions can easily wrap this call to see what |
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150 files _forwardcopies is about to process. |
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151 """ |
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152 missing = set(b.manifest().iterkeys()) |
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153 missing.difference_update(a.manifest().iterkeys()) |
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154 return missing |
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155 |
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156 def _forwardcopies(a, b): |
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157 '''find {dst@b: src@a} copy mapping where a is an ancestor of b''' |
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158 |
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159 # check for working copy |
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160 w = None |
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161 if b.rev() is None: |
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162 w = b |
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163 b = w.p1() |
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164 if a == b: |
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165 # short-circuit to avoid issues with merge states |
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166 return _dirstatecopies(w) |
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167 |
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168 # files might have to be traced back to the fctx parent of the last |
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169 # one-side-only changeset, but not further back than that |
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170 limit = _findlimit(a._repo, a.rev(), b.rev()) |
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171 if limit is None: |
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172 limit = -1 |
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173 am = a.manifest() |
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174 |
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175 # find where new files came from |
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176 # we currently don't try to find where old files went, too expensive |
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177 # this means we can miss a case like 'hg rm b; hg cp a b' |
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178 cm = {} |
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179 missing = _computeforwardmissing(a, b) |
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180 ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) |
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181 for f in missing: |
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182 fctx = b[f] |
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183 fctx._ancestrycontext = ancestrycontext |
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184 ofctx = _tracefile(fctx, am, limit) |
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185 if ofctx: |
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186 cm[f] = ofctx.path() |
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187 |
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188 # combine copies from dirstate if necessary |
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189 if w is not None: |
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190 cm = _chain(a, w, cm, _dirstatecopies(w)) |
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191 |
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192 return cm |
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193 |
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194 def _backwardrenames(a, b): |
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195 # Even though we're not taking copies into account, 1:n rename situations |
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196 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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197 # arbitrarily pick one of the renames. |
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198 f = _forwardcopies(b, a) |
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199 r = {} |
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200 for k, v in sorted(f.iteritems()): |
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201 # remove copies |
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202 if v in a: |
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203 continue |
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204 r[v] = k |
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205 return r |
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206 |
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207 def pathcopies(x, y): |
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208 '''find {dst@y: src@x} copy mapping for directed compare''' |
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209 if x == y or not x or not y: |
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210 return {} |
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211 a = y.ancestor(x) |
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212 if a == x: |
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213 return _forwardcopies(x, y) |
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214 if a == y: |
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215 return _backwardrenames(x, y) |
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216 return _chain(x, y, _backwardrenames(x, a), _forwardcopies(a, y)) |
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217 |
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218 def _computenonoverlap(repo, m1, m2, ma): |
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219 """Computes the files exclusive to m1 and m2. |
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220 This is its own function so extensions can easily wrap this call to see what |
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221 files mergecopies is about to process. |
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222 """ |
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223 u1 = _nonoverlap(m1, m2, ma) |
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224 u2 = _nonoverlap(m2, m1, ma) |
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225 |
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226 if u1: |
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227 repo.ui.debug(" unmatched files in local:\n %s\n" |
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228 % "\n ".join(u1)) |
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229 if u2: |
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230 repo.ui.debug(" unmatched files in other:\n %s\n" |
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231 % "\n ".join(u2)) |
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232 return u1, u2 |
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233 |
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234 def mergecopies(repo, c1, c2, ca): |
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235 """ |
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236 Find moves and copies between context c1 and c2 that are relevant |
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237 for merging. |
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238 |
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239 Returns four dicts: "copy", "movewithdir", "diverge", and |
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240 "renamedelete". |
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241 |
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242 "copy" is a mapping from destination name -> source name, |
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243 where source is in c1 and destination is in c2 or vice-versa. |
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244 |
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245 "movewithdir" is a mapping from source name -> destination name, |
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246 where the file at source present in one context but not the other |
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247 needs to be moved to destination by the merge process, because the |
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248 other context moved the directory it is in. |
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249 |
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250 "diverge" is a mapping of source name -> list of destination names |
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251 for divergent renames. |
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252 |
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253 "renamedelete" is a mapping of source name -> list of destination |
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254 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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255 """ |
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256 # avoid silly behavior for update from empty dir |
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257 if not c1 or not c2 or c1 == c2: |
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258 return {}, {}, {}, {} |
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259 |
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260 # avoid silly behavior for parent -> working dir |
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261 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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262 return repo.dirstate.copies(), {}, {}, {} |
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263 |
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264 limit = _findlimit(repo, c1.rev(), c2.rev()) |
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265 if limit is None: |
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266 # no common ancestor, no copies |
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267 return {}, {}, {}, {} |
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268 m1 = c1.manifest() |
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269 m2 = c2.manifest() |
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270 ma = ca.manifest() |
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271 |
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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 return repo.filectx(f, fileid=n) |
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278 |
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279 ctx = util.lrucachefunc(makectx) |
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280 copy = {} |
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281 movewithdir = {} |
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282 fullcopy = {} |
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283 diverge = {} |
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284 |
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285 repo.ui.debug(" searching for copies back to rev %d\n" % limit) |
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286 |
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287 u1, u2 = _computenonoverlap(repo, m1, m2, ma) |
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288 |
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289 for f in u1: |
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290 checkcopies(ctx, f, m1, m2, ca, limit, diverge, copy, fullcopy) |
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291 |
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292 for f in u2: |
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293 checkcopies(ctx, f, m2, m1, ca, limit, diverge, copy, fullcopy) |
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294 |
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295 renamedelete = {} |
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296 renamedelete2 = set() |
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297 diverge2 = set() |
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298 for of, fl in diverge.items(): |
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299 if len(fl) == 1 or of in c1 or of in c2: |
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300 del diverge[of] # not actually divergent, or not a rename |
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301 if of not in c1 and of not in c2: |
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302 # renamed on one side, deleted on the other side, but filter |
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303 # out files that have been renamed and then deleted |
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304 renamedelete[of] = [f for f in fl if f in c1 or f in c2] |
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305 renamedelete2.update(fl) # reverse map for below |
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306 else: |
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307 diverge2.update(fl) # reverse map for below |
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308 |
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309 bothnew = sorted([d for d in m1 if d in m2 and d not in ma]) |
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310 if bothnew: |
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311 repo.ui.debug(" unmatched files new in both:\n %s\n" |
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312 % "\n ".join(bothnew)) |
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313 bothdiverge, _copy, _fullcopy = {}, {}, {} |
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314 for f in bothnew: |
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315 checkcopies(ctx, f, m1, m2, ca, limit, bothdiverge, _copy, _fullcopy) |
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316 checkcopies(ctx, f, m2, m1, ca, limit, bothdiverge, _copy, _fullcopy) |
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317 for of, fl in bothdiverge.items(): |
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318 if len(fl) == 2 and fl[0] == fl[1]: |
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319 copy[fl[0]] = of # not actually divergent, just matching renames |
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320 |
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321 if fullcopy and repo.ui.debugflag: |
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322 repo.ui.debug(" all copies found (* = to merge, ! = divergent, " |
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323 "% = renamed and deleted):\n") |
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324 for f in sorted(fullcopy): |
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325 note = "" |
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326 if f in copy: |
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327 note += "*" |
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328 if f in diverge2: |
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329 note += "!" |
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330 if f in renamedelete2: |
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331 note += "%" |
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332 repo.ui.debug(" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, |
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333 note)) |
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334 del diverge2 |
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335 |
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336 if not fullcopy: |
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337 return copy, movewithdir, diverge, renamedelete |
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338 |
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339 repo.ui.debug(" checking for directory renames\n") |
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340 |
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341 # generate a directory move map |
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342 d1, d2 = c1.dirs(), c2.dirs() |
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343 d1.addpath('/') |
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344 d2.addpath('/') |
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345 invalid = set() |
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346 dirmove = {} |
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347 |
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348 # examine each file copy for a potential directory move, which is |
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349 # when all the files in a directory are moved to a new directory |
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350 for dst, src in fullcopy.iteritems(): |
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351 dsrc, ddst = _dirname(src), _dirname(dst) |
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352 if dsrc in invalid: |
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353 # already seen to be uninteresting |
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354 continue |
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355 elif dsrc in d1 and ddst in d1: |
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356 # directory wasn't entirely moved locally |
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357 invalid.add(dsrc) |
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358 elif dsrc in d2 and ddst in d2: |
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359 # directory wasn't entirely moved remotely |
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360 invalid.add(dsrc) |
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361 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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362 # files from the same directory moved to two different places |
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363 invalid.add(dsrc) |
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364 else: |
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365 # looks good so far |
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366 dirmove[dsrc + "/"] = ddst + "/" |
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367 |
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368 for i in invalid: |
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369 if i in dirmove: |
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370 del dirmove[i] |
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371 del d1, d2, invalid |
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372 |
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373 if not dirmove: |
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374 return copy, movewithdir, diverge, renamedelete |
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375 |
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376 for d in dirmove: |
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377 repo.ui.debug(" discovered dir src: '%s' -> dst: '%s'\n" % |
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378 (d, dirmove[d])) |
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379 |
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380 # check unaccounted nonoverlapping files against directory moves |
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381 for f in u1 + u2: |
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382 if f not in fullcopy: |
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383 for d in dirmove: |
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384 if f.startswith(d): |
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385 # new file added in a directory that was moved, move it |
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386 df = dirmove[d] + f[len(d):] |
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387 if df not in copy: |
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388 movewithdir[f] = df |
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389 repo.ui.debug((" pending file src: '%s' -> " |
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390 "dst: '%s'\n") % (f, df)) |
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391 break |
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392 |
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393 return copy, movewithdir, diverge, renamedelete |
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394 |
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395 def checkcopies(ctx, f, m1, m2, ca, limit, diverge, copy, fullcopy): |
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396 """ |
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397 check possible copies of f from m1 to m2 |
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398 |
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399 ctx = function accepting (filename, node) that returns a filectx. |
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400 f = the filename to check |
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401 m1 = the source manifest |
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402 m2 = the destination manifest |
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403 ca = the changectx of the common ancestor |
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404 limit = the rev number to not search beyond |
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405 diverge = record all diverges in this dict |
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406 copy = record all non-divergent copies in this dict |
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407 fullcopy = record all copies in this dict |
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408 """ |
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409 |
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410 ma = ca.manifest() |
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411 |
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412 def _related(f1, f2, limit): |
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413 # Walk back to common ancestor to see if the two files originate |
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414 # from the same file. Since workingfilectx's rev() is None it messes |
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415 # up the integer comparison logic, hence the pre-step check for |
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416 # None (f1 and f2 can only be workingfilectx's initially). |
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417 |
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418 if f1 == f2: |
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419 return f1 # a match |
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420 |
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421 g1, g2 = f1.ancestors(), f2.ancestors() |
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422 try: |
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423 f1r, f2r = f1.rev(), f2.rev() |
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424 |
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425 if f1r is None: |
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426 f1 = g1.next() |
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427 if f2r is None: |
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428 f2 = g2.next() |
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429 |
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430 while True: |
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431 f1r, f2r = f1.rev(), f2.rev() |
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432 if f1r > f2r: |
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433 f1 = g1.next() |
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434 elif f2r > f1r: |
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435 f2 = g2.next() |
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436 elif f1 == f2: |
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437 return f1 # a match |
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438 elif f1r == f2r or f1r < limit or f2r < limit: |
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439 return False # copy no longer relevant |
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440 except StopIteration: |
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441 return False |
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442 |
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443 of = None |
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444 seen = set([f]) |
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445 for oc in ctx(f, m1[f]).ancestors(): |
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446 ocr = oc.rev() |
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447 of = oc.path() |
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448 if of in seen: |
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449 # check limit late - grab last rename before |
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450 if ocr < limit: |
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451 break |
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452 continue |
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453 seen.add(of) |
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454 |
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455 fullcopy[f] = of # remember for dir rename detection |
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456 if of not in m2: |
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457 continue # no match, keep looking |
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458 if m2[of] == ma.get(of): |
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459 break # no merge needed, quit early |
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460 c2 = ctx(of, m2[of]) |
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461 cr = _related(oc, c2, ca.rev()) |
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462 if cr and (of == f or of == c2.path()): # non-divergent |
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463 copy[f] = of |
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464 of = None |
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465 break |
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466 |
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467 if of in ma: |
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468 diverge.setdefault(of, []).append(f) |
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469 |
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470 def duplicatecopies(repo, rev, fromrev, skiprev=None): |
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471 '''reproduce copies from fromrev to rev in the dirstate |
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472 |
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473 If skiprev is specified, it's a revision that should be used to |
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474 filter copy records. Any copies that occur between fromrev and |
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475 skiprev will not be duplicated, even if they appear in the set of |
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476 copies between fromrev and rev. |
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477 ''' |
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478 exclude = {} |
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479 if skiprev is not None: |
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480 exclude = pathcopies(repo[fromrev], repo[skiprev]) |
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481 for dst, src in pathcopies(repo[fromrev], repo[rev]).iteritems(): |
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482 # copies.pathcopies returns backward renames, so dst might not |
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483 # actually be in the dirstate |
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484 if dst in exclude: |
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485 continue |
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486 if repo.dirstate[dst] in "nma": |
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487 repo.dirstate.copy(src, dst) |