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1 # changelog bisection for mercurial
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2 #
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3 # Copyright 2007 Matt Mackall
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4 # Copyright 2005, 2006 Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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5 #
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6 # Inspired by git bisect, extension skeleton taken from mq.py.
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7 #
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8 # This software may be used and distributed according to the terms of the
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9 # GNU General Public License version 2, incorporated herein by reference.
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10
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11 import os
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12 from i18n import _
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13 from node import short, hex
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14 import util
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15
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16 def bisect(changelog, state):
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17 """find the next node (if any) for testing during a bisect search.
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18 returns a (nodes, number, good) tuple.
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19
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20 'nodes' is the final result of the bisect if 'number' is 0.
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21 Otherwise 'number' indicates the remaining possible candidates for
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22 the search and 'nodes' contains the next bisect target.
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23 'good' is True if bisect is searching for a first good changeset, False
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24 if searching for a first bad one.
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25 """
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26
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27 clparents = changelog.parentrevs
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28 skip = set([changelog.rev(n) for n in state['skip']])
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29
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30 def buildancestors(bad, good):
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31 # only the earliest bad revision matters
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32 badrev = min([changelog.rev(n) for n in bad])
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33 goodrevs = [changelog.rev(n) for n in good]
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34 # build ancestors array
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35 ancestors = [[]] * (len(changelog) + 1) # an extra for [-1]
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36
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37 # clear good revs from array
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38 for node in goodrevs:
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39 ancestors[node] = None
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40 for rev in xrange(len(changelog), -1, -1):
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41 if ancestors[rev] is None:
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42 for prev in clparents(rev):
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43 ancestors[prev] = None
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44
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45 if ancestors[badrev] is None:
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46 return badrev, None
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47 return badrev, ancestors
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48
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49 good = 0
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50 badrev, ancestors = buildancestors(state['bad'], state['good'])
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51 if not ancestors: # looking for bad to good transition?
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52 good = 1
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53 badrev, ancestors = buildancestors(state['good'], state['bad'])
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54 bad = changelog.node(badrev)
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55 if not ancestors: # now we're confused
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56 raise util.Abort(_("Inconsistent state, %s:%s is good and bad")
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57 % (badrev, short(bad)))
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58
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59 # build children dict
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60 children = {}
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61 visit = [badrev]
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62 candidates = []
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63 while visit:
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64 rev = visit.pop(0)
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65 if ancestors[rev] == []:
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66 candidates.append(rev)
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67 for prev in clparents(rev):
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68 if prev != -1:
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69 if prev in children:
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70 children[prev].append(rev)
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71 else:
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72 children[prev] = [rev]
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73 visit.append(prev)
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74
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75 candidates.sort()
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76 # have we narrowed it down to one entry?
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77 # or have all other possible candidates besides 'bad' have been skipped?
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78 tot = len(candidates)
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79 unskipped = [c for c in candidates if (c not in skip) and (c != badrev)]
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80 if tot == 1 or not unskipped:
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81 return ([changelog.node(rev) for rev in candidates], 0, good)
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82 perfect = tot // 2
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83
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84 # find the best node to test
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85 best_rev = None
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86 best_len = -1
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87 poison = set()
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88 for rev in candidates:
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89 if rev in poison:
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90 # poison children
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91 poison.update(children.get(rev, []))
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92 continue
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93
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94 a = ancestors[rev] or [rev]
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95 ancestors[rev] = None
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96
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97 x = len(a) # number of ancestors
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98 y = tot - x # number of non-ancestors
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99 value = min(x, y) # how good is this test?
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100 if value > best_len and rev not in skip:
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101 best_len = value
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102 best_rev = rev
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103 if value == perfect: # found a perfect candidate? quit early
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104 break
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105
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106 if y < perfect and rev not in skip: # all downhill from here?
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107 # poison children
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108 poison.update(children.get(rev, []))
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109 continue
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110
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111 for c in children.get(rev, []):
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112 if ancestors[c]:
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113 ancestors[c] = list(set(ancestors[c] + a))
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114 else:
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115 ancestors[c] = a + [c]
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116
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117 assert best_rev is not None
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118 best_node = changelog.node(best_rev)
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119
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120 return ([best_node], tot, good)
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121
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122
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123 def load_state(repo):
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124 state = {'good': [], 'bad': [], 'skip': []}
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125 if os.path.exists(repo.join("bisect.state")):
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126 for l in repo.opener("bisect.state"):
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127 kind, node = l[:-1].split()
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128 node = repo.lookup(node)
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129 if kind not in state:
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130 raise util.Abort(_("unknown bisect kind %s") % kind)
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131 state[kind].append(node)
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132 return state
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133
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134
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135 def save_state(repo, state):
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136 f = repo.opener("bisect.state", "w", atomictemp=True)
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137 wlock = repo.wlock()
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138 try:
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139 for kind in state:
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140 for node in state[kind]:
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141 f.write("%s %s\n" % (kind, hex(node)))
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142 f.rename()
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143 finally:
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144 wlock.release()
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145
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