Mercurial > hg
annotate mercurial/copies.py @ 42222:57203e0210f8
copies: calculate mergecopies() based on pathcopies()
When copies are stored in changesets, we need a changeset-centric
version of mergecopies() just like we have a changeset-centric version
of pathcopies(). I think the natural way of thinking about
mergecopies() is in terms of pathcopies() from the base to each of the
commits. So if we can rewrite mergecopies() based on two such
pathcopies() calls, we'll get the changeset-centric version for
free. That's what this patch does.
A nice bonus is that it ends up being a lot simpler. mergecopies() has
accumulated a lot of technical debt over time. One good example is the
code for dealing with grafts (the "partial/incomplete/dirty"
stuff). Since pathcopies() already deals with backwards renames and
ping-pong renames, we get that for free.
I've run tests with hard-coded debug logging for "fullcopy" and while
I haven't looked at every difference it produces, all the ones I have
looked at seemed reasonable to me. I'm a little surprised that no more
tests fail when run with '--extra-config-opt
experimental.copies.read-from=compatibility' compared to before this
patch. This patch also fixes the broken cases in test-annotate.t and
test-fastannotate.t. It also enables the part of test-copies.t that
was previously disabled exactly because mergecopies() needed to get a
changeset-centric version.
One drawback of the rewritten code is that we may now make
remotefilelog prefetch more files. We used to prefetch files that were
unique to either side of the merge compared to the other. We now
prefetch files that are unique to either side of the merge compared to
the base. This means that if you added the same file to each side, we
would not prefetch it before, but we would now. Such cases are
probably quite rare, but one likely scenario where they happen is when
moving from a commit to its successor (or the other way around). The
user will probably already have the files in the cache in such cases,
so it's probably not a big deal.
Some timings for calculating mergecopies between two revisions
(revisions shown on each line, all using the common ancestor as base):
In the hg repo:
4.8 4.9: 0.21s -> 0.21s
4.0 4.8: 0.35s -> 0.63s
In and old copy of the mozilla-unified repo:
FIREFOX_BETA_60_BASE^ FIREFOX_BETA_60_BASE: 0.82s -> 0.82s
FIREFOX_NIGHTLY_59_END FIREFOX_BETA_60_BASE: 2.5s -> 2.6s
FIREFOX_BETA_59_END FIREFOX_BETA_60_BASE: 3.9s -> 4.1s
FIREFOX_AURORA_50_BASE FIREFOX_BETA_60_BASE: 31s -> 33s
So it's measurably slower in most cases. The most significant
difference is in the hg repo between revisions 4.0 and 4.8. In that
case it seems to come from the fact that pathcopies() uses
fctx.isintroducedafter() (in _tracefile), while the old mergecopies()
used fctx.linkrev() (in _checkcopies()). That results in a single call
to filectx._adjustlinkrev(), which is responsible for the entire
difference in time (in my repo). So we pay a performance penalty but
we get more correct code (see change in
test-mv-cp-st-diff.t). Deleting the "== f.filenode()" in _tracefile()
recovers the lost performance in the hg repo.
There were are few other optimizations in _checkcopies() that I could
not measure any impact from. One was from the "seen" set. Another was
from a "continue" when the file was not in the destination manifest
(corresponding to "am" in _tracefile).
Also note that merge copies are not calculated when updating with a
clean working copy, which is probably the most common case. I
therefore think the much simpler code is worth the slowdown.
Differential Revision: https://phab.mercurial-scm.org/D6255
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Thu, 11 Apr 2019 23:22:54 -0700 |
parents | 390ec72b8ea4 |
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1 # copies.py - copy detection for Mercurial |
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2 # |
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3 # Copyright 2008 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import collections |
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11 import heapq |
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12 import os |
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13 |
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14 from .i18n import _ |
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15 |
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16 from . import ( |
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17 match as matchmod, |
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18 node, |
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19 pathutil, |
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20 util, |
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21 ) |
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22 from .utils import ( |
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23 stringutil, |
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24 ) |
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25 |
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26 def _findlimit(repo, ctxa, ctxb): |
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27 """ |
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28 Find the last revision that needs to be checked to ensure that a full |
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29 transitive closure for file copies can be properly calculated. |
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30 Generally, this means finding the earliest revision number that's an |
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31 ancestor of a or b but not both, except when a or b is a direct descendent |
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32 of the other, in which case we can return the minimum revnum of a and b. |
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33 """ |
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34 |
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35 # basic idea: |
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36 # - mark a and b with different sides |
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37 # - if a parent's children are all on the same side, the parent is |
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38 # on that side, otherwise it is on no side |
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39 # - walk the graph in topological order with the help of a heap; |
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40 # - add unseen parents to side map |
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41 # - clear side of any parent that has children on different sides |
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42 # - track number of interesting revs that might still be on a side |
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43 # - track the lowest interesting rev seen |
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44 # - quit when interesting revs is zero |
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45 |
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46 cl = repo.changelog |
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47 wdirparents = None |
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48 a = ctxa.rev() |
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49 b = ctxb.rev() |
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50 if a is None: |
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51 wdirparents = (ctxa.p1(), ctxa.p2()) |
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52 a = node.wdirrev |
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53 if b is None: |
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54 assert not wdirparents |
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55 wdirparents = (ctxb.p1(), ctxb.p2()) |
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56 b = node.wdirrev |
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57 |
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58 side = {a: -1, b: 1} |
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59 visit = [-a, -b] |
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60 heapq.heapify(visit) |
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61 interesting = len(visit) |
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62 limit = node.wdirrev |
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63 |
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64 while interesting: |
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65 r = -heapq.heappop(visit) |
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66 if r == node.wdirrev: |
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67 parents = [pctx.rev() for pctx in wdirparents] |
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68 else: |
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69 parents = cl.parentrevs(r) |
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70 if parents[1] == node.nullrev: |
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71 parents = parents[:1] |
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72 for p in parents: |
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73 if p not in side: |
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74 # first time we see p; add it to visit |
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75 side[p] = side[r] |
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76 if side[p]: |
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77 interesting += 1 |
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78 heapq.heappush(visit, -p) |
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79 elif side[p] and side[p] != side[r]: |
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80 # p was interesting but now we know better |
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81 side[p] = 0 |
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82 interesting -= 1 |
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83 if side[r]: |
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84 limit = r # lowest rev visited |
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85 interesting -= 1 |
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86 |
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87 # Consider the following flow (see test-commit-amend.t under issue4405): |
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88 # 1/ File 'a0' committed |
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89 # 2/ File renamed from 'a0' to 'a1' in a new commit (call it 'a1') |
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90 # 3/ Move back to first commit |
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91 # 4/ Create a new commit via revert to contents of 'a1' (call it 'a1-amend') |
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92 # 5/ Rename file from 'a1' to 'a2' and commit --amend 'a1-msg' |
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93 # |
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94 # During the amend in step five, we will be in this state: |
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95 # |
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96 # @ 3 temporary amend commit for a1-amend |
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97 # | |
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98 # o 2 a1-amend |
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99 # | |
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100 # | o 1 a1 |
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101 # |/ |
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102 # o 0 a0 |
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103 # |
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104 # When _findlimit is called, a and b are revs 3 and 0, so limit will be 2, |
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105 # yet the filelog has the copy information in rev 1 and we will not look |
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106 # back far enough unless we also look at the a and b as candidates. |
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107 # This only occurs when a is a descendent of b or visa-versa. |
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108 return min(limit, a, b) |
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109 |
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110 def _chain(src, dst, a, b): |
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111 """chain two sets of copies a->b""" |
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112 t = a.copy() |
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113 for k, v in b.iteritems(): |
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114 if v in t: |
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115 # found a chain |
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116 if t[v] != k: |
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117 # file wasn't renamed back to itself |
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118 t[k] = t[v] |
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119 if v not in dst: |
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120 # chain was a rename, not a copy |
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121 del t[v] |
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122 if v in src: |
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123 # file is a copy of an existing file |
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124 t[k] = v |
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125 |
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126 for k, v in list(t.items()): |
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127 # remove criss-crossed copies |
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128 if k in src and v in dst: |
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129 del t[k] |
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130 # remove copies to files that were then removed |
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131 elif k not in dst: |
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132 del t[k] |
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133 |
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134 return t |
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135 |
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136 def _tracefile(fctx, am, limit=node.nullrev): |
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137 """return file context that is the ancestor of fctx present in ancestor |
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138 manifest am, stopping after the first ancestor lower than limit""" |
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139 |
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140 for f in fctx.ancestors(): |
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141 if am.get(f.path(), None) == f.filenode(): |
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142 return f |
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143 if limit >= 0 and not f.isintroducedafter(limit): |
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144 return None |
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145 |
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146 def _dirstatecopies(repo, match=None): |
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147 ds = repo.dirstate |
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148 c = ds.copies().copy() |
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149 for k in list(c): |
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150 if ds[k] not in 'anm' or (match and not match(k)): |
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151 del c[k] |
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152 return c |
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153 |
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154 def _computeforwardmissing(a, b, match=None): |
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155 """Computes which files are in b but not a. |
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156 This is its own function so extensions can easily wrap this call to see what |
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157 files _forwardcopies is about to process. |
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158 """ |
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159 ma = a.manifest() |
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160 mb = b.manifest() |
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161 return mb.filesnotin(ma, match=match) |
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162 |
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163 def usechangesetcentricalgo(repo): |
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164 """Checks if we should use changeset-centric copy algorithms""" |
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165 return (repo.ui.config('experimental', 'copies.read-from') in |
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166 ('changeset-only', 'compatibility')) |
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167 |
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168 def _committedforwardcopies(a, b, match): |
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169 """Like _forwardcopies(), but b.rev() cannot be None (working copy)""" |
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170 # files might have to be traced back to the fctx parent of the last |
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171 # one-side-only changeset, but not further back than that |
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172 repo = a._repo |
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173 |
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174 if usechangesetcentricalgo(repo): |
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175 return _changesetforwardcopies(a, b, match) |
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176 |
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177 debug = repo.ui.debugflag and repo.ui.configbool('devel', 'debug.copies') |
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178 dbg = repo.ui.debug |
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179 if debug: |
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180 dbg('debug.copies: looking into rename from %s to %s\n' |
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181 % (a, b)) |
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182 limit = _findlimit(repo, a, b) |
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183 if debug: |
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184 dbg('debug.copies: search limit: %d\n' % limit) |
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185 am = a.manifest() |
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186 |
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187 # find where new files came from |
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188 # we currently don't try to find where old files went, too expensive |
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189 # this means we can miss a case like 'hg rm b; hg cp a b' |
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190 cm = {} |
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191 |
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192 # Computing the forward missing is quite expensive on large manifests, since |
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193 # it compares the entire manifests. We can optimize it in the common use |
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194 # case of computing what copies are in a commit versus its parent (like |
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195 # during a rebase or histedit). Note, we exclude merge commits from this |
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196 # optimization, since the ctx.files() for a merge commit is not correct for |
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197 # this comparison. |
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198 forwardmissingmatch = match |
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199 if b.p1() == a and b.p2().node() == node.nullid: |
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200 filesmatcher = matchmod.exact(b.files()) |
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201 forwardmissingmatch = matchmod.intersectmatchers(match, filesmatcher) |
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202 missing = _computeforwardmissing(a, b, match=forwardmissingmatch) |
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203 |
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204 ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) |
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205 |
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206 if debug: |
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207 dbg('debug.copies: missing files to search: %d\n' % len(missing)) |
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208 |
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209 for f in sorted(missing): |
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210 if debug: |
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211 dbg('debug.copies: tracing file: %s\n' % f) |
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212 fctx = b[f] |
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213 fctx._ancestrycontext = ancestrycontext |
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214 |
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215 if debug: |
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216 start = util.timer() |
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217 ofctx = _tracefile(fctx, am, limit) |
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218 if ofctx: |
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219 if debug: |
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220 dbg('debug.copies: rename of: %s\n' % ofctx._path) |
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221 cm[f] = ofctx.path() |
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222 if debug: |
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223 dbg('debug.copies: time: %f seconds\n' |
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224 % (util.timer() - start)) |
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225 return cm |
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226 |
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227 def _changesetforwardcopies(a, b, match): |
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228 if a.rev() == node.nullrev: |
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229 return {} |
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230 |
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231 repo = a.repo() |
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232 children = {} |
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233 cl = repo.changelog |
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234 missingrevs = cl.findmissingrevs(common=[a.rev()], heads=[b.rev()]) |
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235 for r in missingrevs: |
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236 for p in cl.parentrevs(r): |
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237 if p == node.nullrev: |
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238 continue |
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239 if p not in children: |
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240 children[p] = [r] |
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241 else: |
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242 children[p].append(r) |
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243 |
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244 roots = set(children) - set(missingrevs) |
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245 # 'work' contains 3-tuples of a (revision number, parent number, copies). |
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246 # The parent number is only used for knowing which parent the copies dict |
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247 # came from. |
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248 work = [(r, 1, {}) for r in roots] |
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249 heapq.heapify(work) |
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250 while work: |
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251 r, i1, copies1 = heapq.heappop(work) |
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252 if work and work[0][0] == r: |
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253 # We are tracing copies from both parents |
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254 r, i2, copies2 = heapq.heappop(work) |
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255 copies = {} |
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256 ctx = repo[r] |
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257 p1man, p2man = ctx.p1().manifest(), ctx.p2().manifest() |
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258 allcopies = set(copies1) | set(copies2) |
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259 # TODO: perhaps this filtering should be done as long as ctx |
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260 # is merge, whether or not we're tracing from both parent. |
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261 for dst in allcopies: |
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262 if not match(dst): |
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263 continue |
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264 if dst not in copies2: |
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265 # Copied on p1 side: mark as copy from p1 side if it didn't |
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266 # already exist on p2 side |
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267 if dst not in p2man: |
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268 copies[dst] = copies1[dst] |
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269 elif dst not in copies1: |
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270 # Copied on p2 side: mark as copy from p2 side if it didn't |
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271 # already exist on p1 side |
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272 if dst not in p1man: |
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273 copies[dst] = copies2[dst] |
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274 else: |
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275 # Copied on both sides: mark as copy from p1 side |
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276 copies[dst] = copies1[dst] |
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277 else: |
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278 copies = copies1 |
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279 if r == b.rev(): |
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280 return copies |
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281 for c in children[r]: |
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282 childctx = repo[c] |
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283 if r == childctx.p1().rev(): |
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284 parent = 1 |
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285 childcopies = childctx.p1copies() |
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286 else: |
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287 assert r == childctx.p2().rev() |
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288 parent = 2 |
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289 childcopies = childctx.p2copies() |
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290 if not match.always(): |
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291 childcopies = {dst: src for dst, src in childcopies.items() |
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292 if match(dst)} |
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293 childcopies = _chain(a, childctx, copies, childcopies) |
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294 heapq.heappush(work, (c, parent, childcopies)) |
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295 assert False |
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296 |
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297 def _forwardcopies(a, b, match=None): |
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298 """find {dst@b: src@a} copy mapping where a is an ancestor of b""" |
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299 |
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300 match = a.repo().narrowmatch(match) |
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301 # check for working copy |
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302 if b.rev() is None: |
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303 if a == b.p1(): |
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304 # short-circuit to avoid issues with merge states |
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305 return _dirstatecopies(b._repo, match) |
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306 |
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307 cm = _committedforwardcopies(a, b.p1(), match) |
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308 # combine copies from dirstate if necessary |
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309 return _chain(a, b, cm, _dirstatecopies(b._repo, match)) |
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310 return _committedforwardcopies(a, b, match) |
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311 |
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312 def _backwardrenames(a, b, match): |
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313 if a._repo.ui.config('experimental', 'copytrace') == 'off': |
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314 return {} |
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315 |
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316 # Even though we're not taking copies into account, 1:n rename situations |
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317 # can still exist (e.g. hg cp a b; hg mv a c). In those cases we |
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318 # arbitrarily pick one of the renames. |
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319 # We don't want to pass in "match" here, since that would filter |
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320 # the destination by it. Since we're reversing the copies, we want |
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321 # to filter the source instead. |
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322 f = _forwardcopies(b, a) |
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323 r = {} |
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324 for k, v in sorted(f.iteritems()): |
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325 if match and not match(v): |
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326 continue |
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327 # remove copies |
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328 if v in a: |
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329 continue |
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330 r[v] = k |
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331 return r |
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332 |
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333 def pathcopies(x, y, match=None): |
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334 """find {dst@y: src@x} copy mapping for directed compare""" |
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335 repo = x._repo |
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336 debug = repo.ui.debugflag and repo.ui.configbool('devel', 'debug.copies') |
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337 if debug: |
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338 repo.ui.debug('debug.copies: searching copies from %s to %s\n' |
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339 % (x, y)) |
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340 if x == y or not x or not y: |
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341 return {} |
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342 a = y.ancestor(x) |
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343 if a == x: |
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344 if debug: |
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345 repo.ui.debug('debug.copies: search mode: forward\n') |
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346 return _forwardcopies(x, y, match=match) |
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347 if a == y: |
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348 if debug: |
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349 repo.ui.debug('debug.copies: search mode: backward\n') |
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350 return _backwardrenames(x, y, match=match) |
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351 if debug: |
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352 repo.ui.debug('debug.copies: search mode: combined\n') |
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353 return _chain(x, y, _backwardrenames(x, a, match=match), |
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354 _forwardcopies(a, y, match=match)) |
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355 |
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356 def _computenonoverlap(repo, c1, c2, addedinm1, addedinm2, debug=True): |
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357 """Computes, based on addedinm1 and addedinm2, the files exclusive to c1 |
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358 and c2. This is its own function so extensions can easily wrap this call |
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359 to see what files mergecopies is about to process. |
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360 |
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361 Even though c1 and c2 are not used in this function, they are useful in |
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362 other extensions for being able to read the file nodes of the changed files. |
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363 """ |
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364 u1 = sorted(addedinm1 - addedinm2) |
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365 u2 = sorted(addedinm2 - addedinm1) |
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366 |
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367 if debug: |
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368 header = " unmatched files in %s" |
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369 if u1: |
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370 repo.ui.debug("%s:\n %s\n" % (header % 'local', "\n ".join(u1))) |
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371 if u2: |
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372 repo.ui.debug("%s:\n %s\n" % (header % 'other', "\n ".join(u2))) |
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373 |
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374 return u1, u2 |
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375 |
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376 def mergecopies(repo, c1, c2, base): |
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377 """ |
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378 Finds moves and copies between context c1 and c2 that are relevant for |
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379 merging. 'base' will be used as the merge base. |
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380 |
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381 Copytracing is used in commands like rebase, merge, unshelve, etc to merge |
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382 files that were moved/ copied in one merge parent and modified in another. |
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383 For example: |
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384 |
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385 o ---> 4 another commit |
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386 | |
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387 | o ---> 3 commit that modifies a.txt |
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388 | / |
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389 o / ---> 2 commit that moves a.txt to b.txt |
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390 |/ |
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391 o ---> 1 merge base |
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392 |
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393 If we try to rebase revision 3 on revision 4, since there is no a.txt in |
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394 revision 4, and if user have copytrace disabled, we prints the following |
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395 message: |
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396 |
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397 ```other changed <file> which local deleted``` |
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398 |
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399 Returns five dicts: "copy", "movewithdir", "diverge", "renamedelete" and |
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400 "dirmove". |
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401 |
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402 "copy" is a mapping from destination name -> source name, |
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403 where source is in c1 and destination is in c2 or vice-versa. |
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404 |
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405 "movewithdir" is a mapping from source name -> destination name, |
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406 where the file at source present in one context but not the other |
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407 needs to be moved to destination by the merge process, because the |
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408 other context moved the directory it is in. |
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409 |
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410 "diverge" is a mapping of source name -> list of destination names |
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411 for divergent renames. |
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412 |
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413 "renamedelete" is a mapping of source name -> list of destination |
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414 names for files deleted in c1 that were renamed in c2 or vice-versa. |
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415 |
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416 "dirmove" is a mapping of detected source dir -> destination dir renames. |
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417 This is needed for handling changes to new files previously grafted into |
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418 renamed directories. |
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419 |
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420 This function calls different copytracing algorithms based on config. |
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421 """ |
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422 # avoid silly behavior for update from empty dir |
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423 if not c1 or not c2 or c1 == c2: |
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424 return {}, {}, {}, {}, {} |
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425 |
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426 narrowmatch = c1.repo().narrowmatch() |
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427 |
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428 # avoid silly behavior for parent -> working dir |
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429 if c2.node() is None and c1.node() == repo.dirstate.p1(): |
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430 return _dirstatecopies(repo, narrowmatch), {}, {}, {}, {} |
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431 |
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432 copytracing = repo.ui.config('experimental', 'copytrace') |
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433 boolctrace = stringutil.parsebool(copytracing) |
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434 |
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435 # Copy trace disabling is explicitly below the node == p1 logic above |
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436 # because the logic above is required for a simple copy to be kept across a |
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437 # rebase. |
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438 if copytracing == 'heuristics': |
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439 # Do full copytracing if only non-public revisions are involved as |
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440 # that will be fast enough and will also cover the copies which could |
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441 # be missed by heuristics |
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442 if _isfullcopytraceable(repo, c1, base): |
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443 return _fullcopytracing(repo, c1, c2, base) |
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444 return _heuristicscopytracing(repo, c1, c2, base) |
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445 elif boolctrace is False: |
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446 # stringutil.parsebool() returns None when it is unable to parse the |
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447 # value, so we should rely on making sure copytracing is on such cases |
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448 return {}, {}, {}, {}, {} |
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449 else: |
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450 return _fullcopytracing(repo, c1, c2, base) |
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451 |
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452 def _isfullcopytraceable(repo, c1, base): |
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453 """ Checks that if base, source and destination are all no-public branches, |
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454 if yes let's use the full copytrace algorithm for increased capabilities |
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455 since it will be fast enough. |
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456 |
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457 `experimental.copytrace.sourcecommitlimit` can be used to set a limit for |
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458 number of changesets from c1 to base such that if number of changesets are |
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459 more than the limit, full copytracing algorithm won't be used. |
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460 """ |
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461 if c1.rev() is None: |
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462 c1 = c1.p1() |
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463 if c1.mutable() and base.mutable(): |
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464 sourcecommitlimit = repo.ui.configint('experimental', |
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465 'copytrace.sourcecommitlimit') |
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466 commits = len(repo.revs('%d::%d', base.rev(), c1.rev())) |
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467 return commits < sourcecommitlimit |
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468 return False |
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469 |
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470 def _checksinglesidecopies(src, dsts1, m1, m2, mb, c2, base, |
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471 copy, renamedelete): |
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472 if src not in m2: |
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473 # deleted on side 2 |
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474 if src not in m1: |
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475 # renamed on side 1, deleted on side 2 |
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476 renamedelete[src] = dsts1 |
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477 elif m2[src] != mb[src]: |
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478 if not _related(c2[src], base[src]): |
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479 return |
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480 # modified on side 2 |
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481 for dst in dsts1: |
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482 if dst not in m2: |
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483 # dst not added on side 2 (handle as regular |
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484 # "both created" case in manifestmerge otherwise) |
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485 copy[dst] = src |
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486 |
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487 def _fullcopytracing(repo, c1, c2, base): |
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488 """ The full copytracing algorithm which finds all the new files that were |
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489 added from merge base up to the top commit and for each file it checks if |
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490 this file was copied from another file. |
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491 |
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492 This is pretty slow when a lot of changesets are involved but will track all |
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493 the copies. |
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494 """ |
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495 m1 = c1.manifest() |
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496 m2 = c2.manifest() |
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497 mb = base.manifest() |
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498 |
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499 copies1 = pathcopies(base, c1) |
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500 copies2 = pathcopies(base, c2) |
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501 |
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502 inversecopies1 = {} |
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503 inversecopies2 = {} |
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504 for dst, src in copies1.items(): |
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505 inversecopies1.setdefault(src, []).append(dst) |
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506 for dst, src in copies2.items(): |
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507 inversecopies2.setdefault(src, []).append(dst) |
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508 |
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509 copy = {} |
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510 diverge = {} |
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511 renamedelete = {} |
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512 allsources = set(inversecopies1) | set(inversecopies2) |
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513 for src in allsources: |
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514 dsts1 = inversecopies1.get(src) |
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515 dsts2 = inversecopies2.get(src) |
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516 if dsts1 and dsts2: |
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517 # copied/renamed on both sides |
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518 if src not in m1 and src not in m2: |
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519 # renamed on both sides |
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520 dsts1 = set(dsts1) |
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521 dsts2 = set(dsts2) |
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522 # If there's some overlap in the rename destinations, we |
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523 # consider it not divergent. For example, if side 1 copies 'a' |
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524 # to 'b' and 'c' and deletes 'a', and side 2 copies 'a' to 'c' |
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525 # and 'd' and deletes 'a'. |
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526 if dsts1 & dsts2: |
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527 for dst in (dsts1 & dsts2): |
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528 copy[dst] = src |
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529 else: |
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530 diverge[src] = sorted(dsts1 | dsts2) |
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531 elif src in m1 and src in m2: |
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532 # copied on both sides |
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533 dsts1 = set(dsts1) |
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534 dsts2 = set(dsts2) |
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535 for dst in (dsts1 & dsts2): |
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536 copy[dst] = src |
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537 # TODO: Handle cases where it was renamed on one side and copied |
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538 # on the other side |
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539 elif dsts1: |
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540 # copied/renamed only on side 1 |
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541 _checksinglesidecopies(src, dsts1, m1, m2, mb, c2, base, |
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542 copy, renamedelete) |
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543 elif dsts2: |
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544 # copied/renamed only on side 2 |
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545 _checksinglesidecopies(src, dsts2, m2, m1, mb, c1, base, |
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546 copy, renamedelete) |
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547 |
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548 renamedeleteset = set() |
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549 divergeset = set() |
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550 for src, dsts in diverge.items(): |
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551 divergeset.update(dsts) |
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552 for src, dsts in renamedelete.items(): |
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553 renamedeleteset.update(dsts) |
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554 |
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Matt Mackall <mpm@selenic.com>
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|
555 # find interesting file sets from manifests |
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556 addedinm1 = m1.filesnotin(mb, repo.narrowmatch()) |
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557 addedinm2 = m2.filesnotin(mb, repo.narrowmatch()) |
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558 u1, u2 = _computenonoverlap(repo, c1, c2, addedinm1, addedinm2) |
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559 |
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560 fullcopy = copies1.copy() |
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561 fullcopy.update(copies2) |
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562 if not fullcopy: |
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563 return copy, {}, diverge, renamedelete, {} |
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564 |
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565 if repo.ui.debugflag: |
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566 repo.ui.debug(" all copies found (* = to merge, ! = divergent, " |
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567 "% = renamed and deleted):\n") |
18362
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copies: report found copies sorted
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568 for f in sorted(fullcopy): |
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569 note = "" |
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570 if f in copy: |
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diff
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571 note += "*" |
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572 if f in divergeset: |
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573 note += "!" |
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574 if f in renamedeleteset: |
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575 note += "%" |
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576 repo.ui.debug(" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, |
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577 note)) |
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578 del divergeset |
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579 |
9467
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do not attempt to translate ui.debug output
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580 repo.ui.debug(" checking for directory renames\n") |
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581 |
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582 # generate a directory move map |
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583 d1, d2 = c1.dirs(), c2.dirs() |
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584 # Hack for adding '', which is not otherwise added, to d1 and d2 |
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585 d1.addpath('/') |
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parents:
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586 d2.addpath('/') |
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587 invalid = set() |
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588 dirmove = {} |
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589 |
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590 # examine each file copy for a potential directory move, which is |
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591 # when all the files in a directory are moved to a new directory |
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592 for dst, src in fullcopy.iteritems(): |
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593 dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst) |
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594 if dsrc in invalid: |
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595 # already seen to be uninteresting |
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596 continue |
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597 elif dsrc in d1 and ddst in d1: |
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598 # directory wasn't entirely moved locally |
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599 invalid.add(dsrc) |
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600 elif dsrc in d2 and ddst in d2: |
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601 # directory wasn't entirely moved remotely |
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602 invalid.add(dsrc) |
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603 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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604 # files from the same directory moved to two different places |
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605 invalid.add(dsrc) |
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606 else: |
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607 # looks good so far |
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608 dirmove[dsrc] = ddst |
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609 |
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changeset
|
610 for i in invalid: |
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changeset
|
611 if i in dirmove: |
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|
612 del dirmove[i] |
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diff
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|
613 del d1, d2, invalid |
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|
614 |
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diff
changeset
|
615 if not dirmove: |
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Gábor Stefanik <gabor.stefanik@nng.com>
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616 return copy, {}, diverge, renamedelete, {} |
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617 |
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618 dirmove = {k + "/": v + "/" for k, v in dirmove.iteritems()} |
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619 |
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620 for d in dirmove: |
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|
621 repo.ui.debug(" discovered dir src: '%s' -> dst: '%s'\n" % |
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|
622 (d, dirmove[d])) |
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|
623 |
30183
0106f93ca1d5
checkcopies: move 'movewithdir' initialisation right before its usage
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diff
changeset
|
624 movewithdir = {} |
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625 # check unaccounted nonoverlapping files against directory moves |
42222
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626 for f in u1 + u2: |
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|
627 if f not in fullcopy: |
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changeset
|
628 for d in dirmove: |
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changeset
|
629 if f.startswith(d): |
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diff
changeset
|
630 # new file added in a directory that was moved, move it |
6425
2d9328a2f81f
copies: skip directory rename checks when not merging
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parents:
6424
diff
changeset
|
631 df = dirmove[d] + f[len(d):] |
6426
e2c49ef2dd6e
copies: don't double-detect items in the directory copy check
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diff
changeset
|
632 if df not in copy: |
18134
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changeset
|
633 movewithdir[f] = df |
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|
634 repo.ui.debug((" pending file src: '%s' -> " |
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|
635 "dst: '%s'\n") % (f, df)) |
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changeset
|
636 break |
f3f383efbeae
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parents:
diff
changeset
|
637 |
30581
43a9e02a7b7f
graft: support grafting changes to new file in renamed directory (issue5436)
Gábor Stefanik <gabor.stefanik@nng.com>
parents:
30361
diff
changeset
|
638 return copy, movewithdir, diverge, renamedelete, dirmove |
19178
4327687ca757
copies: refactor checkcopies() into a top level method
Durham Goode <durham@fb.com>
parents:
18899
diff
changeset
|
639 |
34179
036d47d7cf39
copytrace: move fast heuristic copytracing algorithm to core
Pulkit Goyal <7895pulkit@gmail.com>
parents:
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diff
changeset
|
640 def _heuristicscopytracing(repo, c1, c2, base): |
036d47d7cf39
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changeset
|
641 """ Fast copytracing using filename heuristics |
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changeset
|
642 |
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changeset
|
643 Assumes that moves or renames are of following two types: |
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|
644 |
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changeset
|
645 1) Inside a directory only (same directory name but different filenames) |
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|
646 2) Move from one directory to another |
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|
647 (same filenames but different directory names) |
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changeset
|
648 |
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changeset
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649 Works only when there are no merge commits in the "source branch". |
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changeset
|
650 Source branch is commits from base up to c2 not including base. |
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changeset
|
651 |
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changeset
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652 If merge is involved it fallbacks to _fullcopytracing(). |
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653 |
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654 Can be used by setting the following config: |
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655 |
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656 [experimental] |
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657 copytrace = heuristics |
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658 |
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659 In some cases the copy/move candidates found by heuristics can be very large |
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660 in number and that will make the algorithm slow. The number of possible |
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661 candidates to check can be limited by using the config |
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662 `experimental.copytrace.movecandidateslimit` which defaults to 100. |
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663 """ |
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664 |
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665 if c1.rev() is None: |
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666 c1 = c1.p1() |
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667 if c2.rev() is None: |
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668 c2 = c2.p1() |
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669 |
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670 copies = {} |
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671 |
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672 changedfiles = set() |
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673 m1 = c1.manifest() |
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674 if not repo.revs('%d::%d', base.rev(), c2.rev()): |
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675 # If base is not in c2 branch, we switch to fullcopytracing |
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676 repo.ui.debug("switching to full copytracing as base is not " |
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677 "an ancestor of c2\n") |
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678 return _fullcopytracing(repo, c1, c2, base) |
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679 |
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680 ctx = c2 |
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681 while ctx != base: |
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682 if len(ctx.parents()) == 2: |
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683 # To keep things simple let's not handle merges |
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684 repo.ui.debug("switching to full copytracing because of merges\n") |
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685 return _fullcopytracing(repo, c1, c2, base) |
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686 changedfiles.update(ctx.files()) |
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687 ctx = ctx.p1() |
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688 |
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689 cp = _forwardcopies(base, c2) |
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690 for dst, src in cp.iteritems(): |
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691 if src in m1: |
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692 copies[dst] = src |
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693 |
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694 # file is missing if it isn't present in the destination, but is present in |
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695 # the base and present in the source. |
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696 # Presence in the base is important to exclude added files, presence in the |
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697 # source is important to exclude removed files. |
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698 filt = lambda f: f not in m1 and f in base and f in c2 |
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699 missingfiles = [f for f in changedfiles if filt(f)] |
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700 |
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701 if missingfiles: |
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702 basenametofilename = collections.defaultdict(list) |
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703 dirnametofilename = collections.defaultdict(list) |
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704 |
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705 for f in m1.filesnotin(base.manifest()): |
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706 basename = os.path.basename(f) |
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707 dirname = os.path.dirname(f) |
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708 basenametofilename[basename].append(f) |
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709 dirnametofilename[dirname].append(f) |
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710 |
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711 for f in missingfiles: |
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712 basename = os.path.basename(f) |
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713 dirname = os.path.dirname(f) |
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714 samebasename = basenametofilename[basename] |
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715 samedirname = dirnametofilename[dirname] |
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716 movecandidates = samebasename + samedirname |
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717 # f is guaranteed to be present in c2, that's why |
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718 # c2.filectx(f) won't fail |
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719 f2 = c2.filectx(f) |
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720 # we can have a lot of candidates which can slow down the heuristics |
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721 # config value to limit the number of candidates moves to check |
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722 maxcandidates = repo.ui.configint('experimental', |
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723 'copytrace.movecandidateslimit') |
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724 |
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725 if len(movecandidates) > maxcandidates: |
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726 repo.ui.status(_("skipping copytracing for '%s', more " |
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727 "candidates than the limit: %d\n") |
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728 % (f, len(movecandidates))) |
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729 continue |
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730 |
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731 for candidate in movecandidates: |
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732 f1 = c1.filectx(candidate) |
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733 if _related(f1, f2): |
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734 # if there are a few related copies then we'll merge |
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735 # changes into all of them. This matches the behaviour |
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736 # of upstream copytracing |
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737 copies[candidate] = f |
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738 |
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739 return copies, {}, {}, {}, {} |
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740 |
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741 def _related(f1, f2): |
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742 """return True if f1 and f2 filectx have a common ancestor |
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743 |
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744 Walk back to common ancestor to see if the two files originate |
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745 from the same file. Since workingfilectx's rev() is None it messes |
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746 up the integer comparison logic, hence the pre-step check for |
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747 None (f1 and f2 can only be workingfilectx's initially). |
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748 """ |
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749 |
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750 if f1 == f2: |
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751 return True # a match |
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752 |
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753 g1, g2 = f1.ancestors(), f2.ancestors() |
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754 try: |
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755 f1r, f2r = f1.linkrev(), f2.linkrev() |
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756 |
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757 if f1r is None: |
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758 f1 = next(g1) |
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759 if f2r is None: |
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760 f2 = next(g2) |
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761 |
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762 while True: |
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763 f1r, f2r = f1.linkrev(), f2.linkrev() |
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764 if f1r > f2r: |
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765 f1 = next(g1) |
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766 elif f2r > f1r: |
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767 f2 = next(g2) |
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768 else: # f1 and f2 point to files in the same linkrev |
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769 return f1 == f2 # true if they point to the same file |
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770 except StopIteration: |
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771 return False |
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772 |
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773 def duplicatecopies(repo, wctx, rev, fromrev, skiprev=None): |
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774 """reproduce copies from fromrev to rev in the dirstate |
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775 |
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776 If skiprev is specified, it's a revision that should be used to |
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777 filter copy records. Any copies that occur between fromrev and |
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778 skiprev will not be duplicated, even if they appear in the set of |
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779 copies between fromrev and rev. |
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780 """ |
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781 exclude = {} |
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782 ctraceconfig = repo.ui.config('experimental', 'copytrace') |
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783 bctrace = stringutil.parsebool(ctraceconfig) |
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784 if (skiprev is not None and |
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785 (ctraceconfig == 'heuristics' or bctrace or bctrace is None)): |
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786 # copytrace='off' skips this line, but not the entire function because |
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787 # the line below is O(size of the repo) during a rebase, while the rest |
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788 # of the function is much faster (and is required for carrying copy |
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789 # metadata across the rebase anyway). |
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790 exclude = pathcopies(repo[fromrev], repo[skiprev]) |
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791 for dst, src in pathcopies(repo[fromrev], repo[rev]).iteritems(): |
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792 # copies.pathcopies returns backward renames, so dst might not |
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793 # actually be in the dirstate |
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794 if dst in exclude: |
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795 continue |
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796 wctx[dst].markcopied(src) |