author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
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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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# 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 or any later version. |
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10 |
|
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11 |
import os |
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from i18n import _ |
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13 |
from node import short, hex |
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14 |
import util |
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|
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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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'nodes' is the final result of the bisect if 'number' is 0. |
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Otherwise 'number' indicates the remaining possible candidates for |
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the search and 'nodes' contains the next bisect target. |
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'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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|
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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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def buildancestors(bad, good): |
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# only the earliest bad revision matters |
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badrev = min([changelog.rev(n) for n in bad]) |
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goodrevs = [changelog.rev(n) for n in good] |
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goodrev = min(goodrevs) |
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# build visit array |
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ancestors = [None] * (len(changelog) + 1) # an extra for [-1] |
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|
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# set nodes descended from goodrev |
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ancestors[goodrev] = [] |
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for rev in xrange(goodrev + 1, len(changelog)): |
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for prev in clparents(rev): |
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if ancestors[prev] == []: |
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ancestors[rev] = [] |
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|
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# clear good revs from array |
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for node in goodrevs: |
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ancestors[node] = None |
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for rev in xrange(len(changelog), -1, -1): |
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if ancestors[rev] is None: |
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for prev in clparents(rev): |
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ancestors[prev] = None |
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|
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if ancestors[badrev] is None: |
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return badrev, None |
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return badrev, ancestors |
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|
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good = 0 |
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badrev, ancestors = buildancestors(state['bad'], state['good']) |
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if not ancestors: # looking for bad to good transition? |
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good = 1 |
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badrev, ancestors = buildancestors(state['good'], state['bad']) |
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bad = changelog.node(badrev) |
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if not ancestors: # now we're confused |
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if len(state['bad']) == 1 and len(state['good']) == 1: |
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raise util.Abort(_("starting revisions are not directly related")) |
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raise util.Abort(_("inconsistent state, %s:%s is good and bad") |
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67 |
% (badrev, short(bad))) |
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68 |
|
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# build children dict |
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children = {} |
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visit = [badrev] |
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candidates = [] |
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while visit: |
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rev = visit.pop(0) |
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if ancestors[rev] == []: |
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candidates.append(rev) |
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for prev in clparents(rev): |
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if prev != -1: |
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if prev in children: |
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children[prev].append(rev) |
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else: |
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82 |
children[prev] = [rev] |
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visit.append(prev) |
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84 |
|
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85 |
candidates.sort() |
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86 |
# have we narrowed it down to one entry? |
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87 |
# or have all other possible candidates besides 'bad' have been skipped? |
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88 |
tot = len(candidates) |
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89 |
unskipped = [c for c in candidates if (c not in skip) and (c != badrev)] |
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90 |
if tot == 1 or not unskipped: |
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return ([changelog.node(rev) for rev in candidates], 0, good) |
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92 |
perfect = tot // 2 |
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93 |
|
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94 |
# find the best node to test |
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95 |
best_rev = None |
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96 |
best_len = -1 |
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97 |
poison = set() |
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98 |
for rev in candidates: |
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99 |
if rev in poison: |
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100 |
# poison children |
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101 |
poison.update(children.get(rev, [])) |
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102 |
continue |
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103 |
|
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104 |
a = ancestors[rev] or [rev] |
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105 |
ancestors[rev] = None |
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106 |
|
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107 |
x = len(a) # number of ancestors |
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108 |
y = tot - x # number of non-ancestors |
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109 |
value = min(x, y) # how good is this test? |
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110 |
if value > best_len and rev not in skip: |
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111 |
best_len = value |
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112 |
best_rev = rev |
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113 |
if value == perfect: # found a perfect candidate? quit early |
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114 |
break |
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115 |
|
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116 |
if y < perfect and rev not in skip: # all downhill from here? |
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117 |
# poison children |
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118 |
poison.update(children.get(rev, [])) |
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119 |
continue |
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120 |
|
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121 |
for c in children.get(rev, []): |
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122 |
if ancestors[c]: |
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123 |
ancestors[c] = list(set(ancestors[c] + a)) |
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124 |
else: |
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125 |
ancestors[c] = a + [c] |
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126 |
|
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127 |
assert best_rev is not None |
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128 |
best_node = changelog.node(best_rev) |
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129 |
|
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130 |
return ([best_node], tot, good) |
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131 |
|
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132 |
|
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133 |
def load_state(repo): |
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134 |
state = {'good': [], 'bad': [], 'skip': []} |
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135 |
if os.path.exists(repo.join("bisect.state")): |
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136 |
for l in repo.opener("bisect.state"): |
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137 |
kind, node = l[:-1].split() |
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138 |
node = repo.lookup(node) |
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139 |
if kind not in state: |
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140 |
raise util.Abort(_("unknown bisect kind %s") % kind) |
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141 |
state[kind].append(node) |
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142 |
return state |
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143 |
|
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|
144 |
|
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145 |
def save_state(repo, state): |
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146 |
f = repo.opener("bisect.state", "w", atomictemp=True) |
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147 |
wlock = repo.wlock() |
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148 |
try: |
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149 |
for kind in state: |
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|
150 |
for node in state[kind]: |
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151 |
f.write("%s %s\n" % (kind, hex(node))) |
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152 |
f.rename() |
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|
153 |
finally: |
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|
154 |
wlock.release() |
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|
155 |