Mercurial > hg
annotate mercurial/hbisect.py @ 12727:52971985be14
backout: provide linear backout as a default (without --merge option)
This changes backouts changeset to retain linear history, .e. it is committed
as a child of the working directory parent, not the reverted changeset
parent.
The default behavior was previously to just commit a reverted change as a
child of the backed out changeset - thus creating a new head. Most of
the time, you would use the --merge option, as it does not make sense to
keep this dangling head as is.
The previous behavior could be obtained by using 'hg update --clean .' after a
'hg backout --merge'.
The --merge option itself is not affected by this change. There is also
still an autocommit of the backout if a merge is not needed, i.e. in case
the backout is the parent of the working directory.
Previously we had (pwd = parent of the working directory):
pwd older
backout auto merge
backout --merge auto commit
With the new linear approach:
pwd older
backout auto commit
backout --merge auto commit
auto: commit done by the backout command
merge: backout also already committed but explicit merge and commit needed
commit: user need to commit the update/merge
author | Gilles Moris <gilles.moris@free.fr> |
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date | Fri, 10 Sep 2010 10:28:18 +0200 |
parents | a4fbbe0fbc38 |
children | e5a59d31bb04 |
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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 |
10263 | 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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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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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 goodrev = min(goodrevs) |
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35 # build visit array |
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36 ancestors = [None] * (len(changelog) + 1) # an extra for [-1] |
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37 |
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38 # set nodes descended from goodrev |
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39 ancestors[goodrev] = [] |
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40 for rev in xrange(goodrev + 1, len(changelog)): |
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41 for prev in clparents(rev): |
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42 if ancestors[prev] == []: |
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43 ancestors[rev] = [] |
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44 |
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45 # clear good revs from array |
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46 for node in goodrevs: |
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47 ancestors[node] = None |
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48 for rev in xrange(len(changelog), -1, -1): |
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49 if ancestors[rev] is None: |
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50 for prev in clparents(rev): |
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51 ancestors[prev] = None |
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52 |
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53 if ancestors[badrev] is None: |
5777 | 54 return badrev, None |
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55 return badrev, ancestors |
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56 |
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57 good = 0 |
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58 badrev, ancestors = buildancestors(state['bad'], state['good']) |
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59 if not ancestors: # looking for bad to good transition? |
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60 good = 1 |
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61 badrev, ancestors = buildancestors(state['good'], state['bad']) |
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63 if not ancestors: # now we're confused |
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64 if len(state['bad']) == 1 and len(state['good']) == 1: |
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65 raise util.Abort(_("starting revisions are not directly related")) |
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66 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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69 # build children dict |
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70 children = {} |
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71 visit = [badrev] |
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72 candidates = [] |
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73 while visit: |
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74 rev = visit.pop(0) |
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75 if ancestors[rev] == []: |
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76 candidates.append(rev) |
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77 for prev in clparents(rev): |
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78 if prev != -1: |
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79 if prev in children: |
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80 children[prev].append(rev) |
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81 else: |
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82 children[prev] = [rev] |
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83 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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91 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 |
5737 | 127 assert best_rev is not None |
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 |