Mercurial > hg
annotate mercurial/hbisect.py @ 36160:9fd8c2a3db5a
narrowspec: move module into core
Having support for parsing the narrow specification in core is
necessary for moving many other parts of narrow to core.
We do still want to harmonize the narrow spec with the sparse
spec. And the format needs to be documented. But this shouldn't
hold up the code moving to core.
Differential Revision: https://phab.mercurial-scm.org/D2201
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 12 Feb 2018 16:21:34 -0800 |
parents | 8287df8b7be5 |
children | 80da79b6fbe4 |
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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 from __future__ import absolute_import |
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12 |
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13 import collections |
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14 |
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15 from .i18n import _ |
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16 from .node import ( |
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17 hex, |
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18 short, |
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19 ) |
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20 from . import ( |
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21 error, |
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22 ) |
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23 |
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24 def bisect(repo, state): |
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25 """find the next node (if any) for testing during a bisect search. |
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26 returns a (nodes, number, good) tuple. |
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27 |
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28 'nodes' is the final result of the bisect if 'number' is 0. |
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29 Otherwise 'number' indicates the remaining possible candidates for |
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30 the search and 'nodes' contains the next bisect target. |
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31 'good' is True if bisect is searching for a first good changeset, False |
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32 if searching for a first bad one. |
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33 """ |
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34 |
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35 changelog = repo.changelog |
5737 | 36 clparents = changelog.parentrevs |
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37 skip = set([changelog.rev(n) for n in state['skip']]) |
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38 |
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39 def buildancestors(bad, good): |
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40 badrev = min([changelog.rev(n) for n in bad]) |
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41 ancestors = collections.defaultdict(lambda: None) |
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42 for rev in repo.revs("descendants(%ln) - ancestors(%ln)", good, good): |
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43 ancestors[rev] = [] |
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44 if ancestors[badrev] is None: |
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46 return badrev, ancestors |
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47 |
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48 good = False |
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49 badrev, ancestors = buildancestors(state['bad'], state['good']) |
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50 if not ancestors: # looking for bad to good transition? |
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51 good = True |
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52 badrev, ancestors = buildancestors(state['good'], state['bad']) |
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54 if not ancestors: # now we're confused |
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55 if (len(state['bad']) == 1 and len(state['good']) == 1 and |
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56 state['bad'] != state['good']): |
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57 raise error.Abort(_("starting revisions are not directly related")) |
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58 raise error.Abort(_("inconsistent state, %s:%s is good and bad") |
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59 % (badrev, short(bad))) |
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60 |
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61 # build children dict |
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62 children = {} |
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63 visit = collections.deque([badrev]) |
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64 candidates = [] |
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65 while visit: |
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66 rev = visit.popleft() |
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67 if ancestors[rev] == []: |
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68 candidates.append(rev) |
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69 for prev in clparents(rev): |
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70 if prev != -1: |
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71 if prev in children: |
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72 children[prev].append(rev) |
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73 else: |
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74 children[prev] = [rev] |
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75 visit.append(prev) |
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76 |
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77 candidates.sort() |
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78 # have we narrowed it down to one entry? |
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79 # or have all other possible candidates besides 'bad' have been skipped? |
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80 tot = len(candidates) |
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81 unskipped = [c for c in candidates if (c not in skip) and (c != badrev)] |
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82 if tot == 1 or not unskipped: |
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83 return ([changelog.node(c) for c in candidates], 0, good) |
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84 perfect = tot // 2 |
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85 |
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86 # find the best node to test |
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87 best_rev = None |
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88 best_len = -1 |
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89 poison = set() |
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90 for rev in candidates: |
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91 if rev in poison: |
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92 # poison children |
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93 poison.update(children.get(rev, [])) |
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94 continue |
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95 |
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96 a = ancestors[rev] or [rev] |
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97 ancestors[rev] = None |
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98 |
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99 x = len(a) # number of ancestors |
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100 y = tot - x # number of non-ancestors |
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101 value = min(x, y) # how good is this test? |
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102 if value > best_len and rev not in skip: |
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103 best_len = value |
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104 best_rev = rev |
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105 if value == perfect: # found a perfect candidate? quit early |
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106 break |
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107 |
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108 if y < perfect and rev not in skip: # all downhill from here? |
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109 # poison children |
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110 poison.update(children.get(rev, [])) |
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111 continue |
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112 |
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113 for c in children.get(rev, []): |
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114 if ancestors[c]: |
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115 ancestors[c] = list(set(ancestors[c] + a)) |
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116 else: |
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117 ancestors[c] = a + [c] |
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118 |
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120 best_node = changelog.node(best_rev) | |
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121 |
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122 return ([best_node], tot, good) |
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123 |
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124 def extendrange(repo, state, nodes, good): |
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125 # bisect is incomplete when it ends on a merge node and |
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126 # one of the parent was not checked. |
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127 parents = repo[nodes[0]].parents() |
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128 if len(parents) > 1: |
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129 if good: |
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130 side = state['bad'] |
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131 else: |
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132 side = state['good'] |
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133 num = len(set(i.node() for i in parents) & set(side)) |
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134 if num == 1: |
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135 return parents[0].ancestor(parents[1]) |
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136 return None |
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137 |
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138 def load_state(repo): |
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139 state = {'current': [], 'good': [], 'bad': [], 'skip': []} |
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140 for l in repo.vfs.tryreadlines("bisect.state"): |
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141 kind, node = l[:-1].split() |
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142 node = repo.lookup(node) |
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143 if kind not in state: |
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144 raise error.Abort(_("unknown bisect kind %s") % kind) |
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145 state[kind].append(node) |
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146 return state |
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147 |
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148 |
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149 def save_state(repo, state): |
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150 f = repo.vfs("bisect.state", "w", atomictemp=True) |
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151 with repo.wlock(): |
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152 for kind in sorted(state): |
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153 for node in state[kind]: |
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154 f.write("%s %s\n" % (kind, hex(node))) |
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155 f.close() |
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156 |
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157 def resetstate(repo): |
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158 """remove any bisect state from the repository""" |
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159 if repo.vfs.exists("bisect.state"): |
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160 repo.vfs.unlink("bisect.state") |
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161 |
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162 def checkstate(state): |
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163 """check we have both 'good' and 'bad' to define a range |
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164 |
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165 Raise Abort exception otherwise.""" |
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166 if state['good'] and state['bad']: |
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167 return True |
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168 if not state['good']: |
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169 raise error.Abort(_('cannot bisect (no known good revisions)')) |
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170 else: |
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171 raise error.Abort(_('cannot bisect (no known bad revisions)')) |
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172 |
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173 def get(repo, status): |
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174 """ |
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175 Return a list of revision(s) that match the given status: |
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176 |
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177 - ``good``, ``bad``, ``skip``: csets explicitly marked as good/bad/skip |
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178 - ``goods``, ``bads`` : csets topologically good/bad |
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179 - ``range`` : csets taking part in the bisection |
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180 - ``pruned`` : csets that are goods, bads or skipped |
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181 - ``untested`` : csets whose fate is yet unknown |
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182 - ``ignored`` : csets ignored due to DAG topology |
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183 - ``current`` : the cset currently being bisected |
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184 """ |
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185 state = load_state(repo) |
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186 if status in ('good', 'bad', 'skip', 'current'): |
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187 return map(repo.changelog.rev, state[status]) |
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188 else: |
17493 | 189 # In the following sets, we do *not* call 'bisect()' with more |
17509 | 190 # than one level of recursion, because that can be very, very |
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191 # time consuming. Instead, we always develop the expression as |
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192 # much as possible. |
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193 |
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194 # 'range' is all csets that make the bisection: |
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195 # - have a good ancestor and a bad descendant, or conversely |
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196 # that's because the bisection can go either way |
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197 range = '( bisect(bad)::bisect(good) | bisect(good)::bisect(bad) )' |
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198 |
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199 _t = repo.revs('bisect(good)::bisect(bad)') |
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200 # The sets of topologically good or bad csets |
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201 if len(_t) == 0: |
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202 # Goods are topologically after bads |
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203 goods = 'bisect(good)::' # Pruned good csets |
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204 bads = '::bisect(bad)' # Pruned bad csets |
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205 else: |
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206 # Goods are topologically before bads |
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207 goods = '::bisect(good)' # Pruned good csets |
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208 bads = 'bisect(bad)::' # Pruned bad csets |
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209 |
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210 # 'pruned' is all csets whose fate is already known: good, bad, skip |
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211 skips = 'bisect(skip)' # Pruned skipped csets |
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212 pruned = '( (%s) | (%s) | (%s) )' % (goods, bads, skips) |
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213 |
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214 # 'untested' is all cset that are- in 'range', but not in 'pruned' |
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215 untested = '( (%s) - (%s) )' % (range, pruned) |
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216 |
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217 # 'ignored' is all csets that were not used during the bisection |
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218 # due to DAG topology, but may however have had an impact. |
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219 # E.g., a branch merged between bads and goods, but whose branch- |
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220 # point is out-side of the range. |
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221 iba = '::bisect(bad) - ::bisect(good)' # Ignored bads' ancestors |
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222 iga = '::bisect(good) - ::bisect(bad)' # Ignored goods' ancestors |
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223 ignored = '( ( (%s) | (%s) ) - (%s) )' % (iba, iga, range) |
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224 |
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225 if status == 'range': |
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226 return repo.revs(range) |
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227 elif status == 'pruned': |
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228 return repo.revs(pruned) |
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229 elif status == 'untested': |
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230 return repo.revs(untested) |
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231 elif status == 'ignored': |
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232 return repo.revs(ignored) |
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233 elif status == "goods": |
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234 return repo.revs(goods) |
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235 elif status == "bads": |
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236 return repo.revs(bads) |
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237 else: |
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238 raise error.ParseError(_('invalid bisect state')) |
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239 |
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240 def label(repo, node): |
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241 rev = repo.changelog.rev(node) |
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242 |
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243 # Try explicit sets |
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244 if rev in get(repo, 'good'): |
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245 # i18n: bisect changeset status |
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246 return _('good') |
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247 if rev in get(repo, 'bad'): |
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248 # i18n: bisect changeset status |
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249 return _('bad') |
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250 if rev in get(repo, 'skip'): |
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251 # i18n: bisect changeset status |
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252 return _('skipped') |
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253 if rev in get(repo, 'untested') or rev in get(repo, 'current'): |
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254 # i18n: bisect changeset status |
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255 return _('untested') |
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256 if rev in get(repo, 'ignored'): |
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257 # i18n: bisect changeset status |
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258 return _('ignored') |
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259 |
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260 # Try implicit sets |
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261 if rev in get(repo, 'goods'): |
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262 # i18n: bisect changeset status |
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263 return _('good (implicit)') |
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264 if rev in get(repo, 'bads'): |
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265 # i18n: bisect changeset status |
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266 return _('bad (implicit)') |
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267 |
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268 return None |
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269 |
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270 def shortlabel(label): |
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271 if label: |
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272 return label[0].upper() |
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273 |
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274 return None |
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275 |
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276 def printresult(ui, repo, state, displayer, nodes, good): |
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277 if len(nodes) == 1: |
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278 # narrowed it down to a single revision |
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279 if good: |
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280 ui.write(_("The first good revision is:\n")) |
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281 else: |
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282 ui.write(_("The first bad revision is:\n")) |
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283 displayer.show(repo[nodes[0]]) |
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284 extendnode = extendrange(repo, state, nodes, good) |
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285 if extendnode is not None: |
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286 ui.write(_('Not all ancestors of this changeset have been' |
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287 ' checked.\nUse bisect --extend to continue the ' |
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288 'bisection from\nthe common ancestor, %s.\n') |
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289 % extendnode) |
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290 else: |
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291 # multiple possible revisions |
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292 if good: |
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293 ui.write(_("Due to skipped revisions, the first " |
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294 "good revision could be any of:\n")) |
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295 else: |
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296 ui.write(_("Due to skipped revisions, the first " |
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297 "bad revision could be any of:\n")) |
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298 for n in nodes: |
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299 displayer.show(repo[n]) |
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300 displayer.close() |