Mercurial > hg
annotate mercurial/hbisect.py @ 43077:687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Done with
python3.7 contrib/byteify-strings.py -i $(hg files 'set:mercurial/**.py - mercurial/thirdparty/** + hgext/**.py - hgext/fsmonitor/pywatchman/** - mercurial/__init__.py')
black -l 80 -t py33 -S $(hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**" - hgext/fsmonitor/pywatchman/**')
# skip-blame mass-reformatting only
Differential Revision: https://phab.mercurial-scm.org/D6972
author | Augie Fackler <augie@google.com> |
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date | Sun, 06 Oct 2019 09:48:39 -0400 |
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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 error |
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21 |
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22 |
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23 def bisect(repo, state): |
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24 """find the next node (if any) for testing during a bisect search. |
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25 returns a (nodes, number, good) tuple. |
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26 |
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27 'nodes' is the final result of the bisect if 'number' is 0. |
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28 Otherwise 'number' indicates the remaining possible candidates for |
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29 the search and 'nodes' contains the next bisect target. |
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30 'good' is True if bisect is searching for a first good changeset, False |
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31 if searching for a first bad one. |
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32 """ |
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33 |
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34 repo = repo.unfiltered() |
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35 changelog = repo.changelog |
5737 | 36 clparents = changelog.parentrevs |
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37 skip = {changelog.rev(n) for n in state[b'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(b"descendants(%ln) - ancestors(%ln)", good, good): |
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43 ancestors[rev] = [] |
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44 if ancestors[badrev] is None: |
5777 | 45 return badrev, 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[b'bad'], state[b'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[b'good'], state[b'bad']) |
5777 | 53 bad = changelog.node(badrev) |
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54 if not ancestors: # now we're confused |
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55 if ( |
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56 len(state[b'bad']) == 1 |
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57 and len(state[b'good']) == 1 |
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58 and state[b'bad'] != state[b'good'] |
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59 ): |
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60 raise error.Abort(_(b"starting revisions are not directly related")) |
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61 raise error.Abort( |
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62 _(b"inconsistent state, %d:%s is good and bad") |
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63 % (badrev, short(bad)) |
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64 ) |
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65 |
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66 # build children dict |
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67 children = {} |
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68 visit = collections.deque([badrev]) |
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69 candidates = [] |
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70 while visit: |
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71 rev = visit.popleft() |
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72 if ancestors[rev] == []: |
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73 candidates.append(rev) |
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74 for prev in clparents(rev): |
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75 if prev != -1: |
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76 if prev in children: |
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77 children[prev].append(rev) |
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78 else: |
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79 children[prev] = [rev] |
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80 visit.append(prev) |
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81 |
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82 candidates.sort() |
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83 # have we narrowed it down to one entry? |
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84 # or have all other possible candidates besides 'bad' have been skipped? |
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85 tot = len(candidates) |
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86 unskipped = [c for c in candidates if (c not in skip) and (c != badrev)] |
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87 if tot == 1 or not unskipped: |
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88 return ([changelog.node(c) for c in candidates], 0, good) |
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89 perfect = tot // 2 |
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90 |
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91 # find the best node to test |
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92 best_rev = None |
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93 best_len = -1 |
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94 poison = set() |
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95 for rev in candidates: |
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96 if rev in poison: |
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97 # poison children |
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98 poison.update(children.get(rev, [])) |
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99 continue |
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100 |
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101 a = ancestors[rev] or [rev] |
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102 ancestors[rev] = None |
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103 |
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104 x = len(a) # number of ancestors |
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105 y = tot - x # number of non-ancestors |
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106 value = min(x, y) # how good is this test? |
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107 if value > best_len and rev not in skip: |
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108 best_len = value |
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109 best_rev = rev |
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110 if value == perfect: # found a perfect candidate? quit early |
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111 break |
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112 |
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113 if y < perfect and rev not in skip: # all downhill from here? |
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114 # poison children |
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115 poison.update(children.get(rev, [])) |
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116 continue |
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117 |
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118 for c in children.get(rev, []): |
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119 if ancestors[c]: |
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120 ancestors[c] = list(set(ancestors[c] + a)) |
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121 else: |
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122 ancestors[c] = a + [c] |
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123 |
5737 | 124 assert best_rev is not None |
125 best_node = changelog.node(best_rev) | |
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126 |
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127 return ([best_node], tot, good) |
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128 |
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129 |
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130 def extendrange(repo, state, nodes, good): |
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131 # bisect is incomplete when it ends on a merge node and |
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132 # one of the parent was not checked. |
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133 parents = repo[nodes[0]].parents() |
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134 if len(parents) > 1: |
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135 if good: |
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136 side = state[b'bad'] |
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137 else: |
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138 side = state[b'good'] |
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139 num = len(set(i.node() for i in parents) & set(side)) |
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140 if num == 1: |
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141 return parents[0].ancestor(parents[1]) |
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142 return None |
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143 |
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144 |
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145 def load_state(repo): |
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146 state = {b'current': [], b'good': [], b'bad': [], b'skip': []} |
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147 for l in repo.vfs.tryreadlines(b"bisect.state"): |
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148 kind, node = l[:-1].split() |
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149 node = repo.unfiltered().lookup(node) |
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150 if kind not in state: |
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151 raise error.Abort(_(b"unknown bisect kind %s") % kind) |
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152 state[kind].append(node) |
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153 return state |
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154 |
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155 |
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156 def save_state(repo, state): |
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157 f = repo.vfs(b"bisect.state", b"w", atomictemp=True) |
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158 with repo.wlock(): |
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159 for kind in sorted(state): |
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160 for node in state[kind]: |
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161 f.write(b"%s %s\n" % (kind, hex(node))) |
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162 f.close() |
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163 |
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164 |
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165 def resetstate(repo): |
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166 """remove any bisect state from the repository""" |
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167 if repo.vfs.exists(b"bisect.state"): |
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168 repo.vfs.unlink(b"bisect.state") |
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169 |
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170 |
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171 def checkstate(state): |
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172 """check we have both 'good' and 'bad' to define a range |
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173 |
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174 Raise Abort exception otherwise.""" |
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175 if state[b'good'] and state[b'bad']: |
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176 return True |
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177 if not state[b'good']: |
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178 raise error.Abort(_(b'cannot bisect (no known good revisions)')) |
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179 else: |
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180 raise error.Abort(_(b'cannot bisect (no known bad revisions)')) |
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181 |
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182 |
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183 def get(repo, status): |
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184 """ |
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185 Return a list of revision(s) that match the given status: |
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186 |
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187 - ``good``, ``bad``, ``skip``: csets explicitly marked as good/bad/skip |
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188 - ``goods``, ``bads`` : csets topologically good/bad |
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189 - ``range`` : csets taking part in the bisection |
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190 - ``pruned`` : csets that are goods, bads or skipped |
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191 - ``untested`` : csets whose fate is yet unknown |
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192 - ``ignored`` : csets ignored due to DAG topology |
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193 - ``current`` : the cset currently being bisected |
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194 """ |
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195 state = load_state(repo) |
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196 if status in (b'good', b'bad', b'skip', b'current'): |
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197 return map(repo.unfiltered().changelog.rev, state[status]) |
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198 else: |
17493 | 199 # In the following sets, we do *not* call 'bisect()' with more |
17509 | 200 # than one level of recursion, because that can be very, very |
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201 # time consuming. Instead, we always develop the expression as |
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202 # much as possible. |
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203 |
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204 # 'range' is all csets that make the bisection: |
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205 # - have a good ancestor and a bad descendant, or conversely |
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206 # that's because the bisection can go either way |
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207 range = b'( bisect(bad)::bisect(good) | bisect(good)::bisect(bad) )' |
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208 |
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209 _t = repo.revs(b'bisect(good)::bisect(bad)') |
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210 # The sets of topologically good or bad csets |
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211 if len(_t) == 0: |
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212 # Goods are topologically after bads |
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213 goods = b'bisect(good)::' # Pruned good csets |
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214 bads = b'::bisect(bad)' # Pruned bad csets |
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215 else: |
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216 # Goods are topologically before bads |
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217 goods = b'::bisect(good)' # Pruned good csets |
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218 bads = b'bisect(bad)::' # Pruned bad csets |
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219 |
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220 # 'pruned' is all csets whose fate is already known: good, bad, skip |
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221 skips = b'bisect(skip)' # Pruned skipped csets |
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222 pruned = b'( (%s) | (%s) | (%s) )' % (goods, bads, skips) |
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223 |
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224 # 'untested' is all cset that are- in 'range', but not in 'pruned' |
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225 untested = b'( (%s) - (%s) )' % (range, pruned) |
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226 |
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227 # 'ignored' is all csets that were not used during the bisection |
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228 # due to DAG topology, but may however have had an impact. |
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229 # E.g., a branch merged between bads and goods, but whose branch- |
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230 # point is out-side of the range. |
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231 iba = b'::bisect(bad) - ::bisect(good)' # Ignored bads' ancestors |
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232 iga = b'::bisect(good) - ::bisect(bad)' # Ignored goods' ancestors |
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233 ignored = b'( ( (%s) | (%s) ) - (%s) )' % (iba, iga, range) |
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234 |
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235 if status == b'range': |
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236 return repo.revs(range) |
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237 elif status == b'pruned': |
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238 return repo.revs(pruned) |
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239 elif status == b'untested': |
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240 return repo.revs(untested) |
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241 elif status == b'ignored': |
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242 return repo.revs(ignored) |
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243 elif status == b"goods": |
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244 return repo.revs(goods) |
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245 elif status == b"bads": |
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246 return repo.revs(bads) |
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247 else: |
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248 raise error.ParseError(_(b'invalid bisect state')) |
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249 |
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250 |
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251 def label(repo, node): |
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252 rev = repo.changelog.rev(node) |
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253 |
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254 # Try explicit sets |
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255 if rev in get(repo, b'good'): |
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256 # i18n: bisect changeset status |
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257 return _(b'good') |
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258 if rev in get(repo, b'bad'): |
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259 # i18n: bisect changeset status |
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260 return _(b'bad') |
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261 if rev in get(repo, b'skip'): |
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262 # i18n: bisect changeset status |
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263 return _(b'skipped') |
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264 if rev in get(repo, b'untested') or rev in get(repo, b'current'): |
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265 # i18n: bisect changeset status |
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266 return _(b'untested') |
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267 if rev in get(repo, b'ignored'): |
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268 # i18n: bisect changeset status |
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269 return _(b'ignored') |
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270 |
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271 # Try implicit sets |
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272 if rev in get(repo, b'goods'): |
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273 # i18n: bisect changeset status |
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274 return _(b'good (implicit)') |
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275 if rev in get(repo, b'bads'): |
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276 # i18n: bisect changeset status |
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277 return _(b'bad (implicit)') |
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278 |
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279 return None |
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280 |
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281 |
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282 def printresult(ui, repo, state, displayer, nodes, good): |
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283 repo = repo.unfiltered() |
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284 if len(nodes) == 1: |
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285 # narrowed it down to a single revision |
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286 if good: |
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287 ui.write(_(b"The first good revision is:\n")) |
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288 else: |
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289 ui.write(_(b"The first bad revision is:\n")) |
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290 displayer.show(repo[nodes[0]]) |
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291 extendnode = extendrange(repo, state, nodes, good) |
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292 if extendnode is not None: |
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293 ui.write( |
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294 _( |
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295 b'Not all ancestors of this changeset have been' |
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296 b' checked.\nUse bisect --extend to continue the ' |
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297 b'bisection from\nthe common ancestor, %s.\n' |
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298 ) |
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299 % extendnode |
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300 ) |
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301 else: |
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302 # multiple possible revisions |
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303 if good: |
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304 ui.write( |
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305 _( |
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306 b"Due to skipped revisions, the first " |
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307 b"good revision could be any of:\n" |
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308 ) |
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309 ) |
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310 else: |
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311 ui.write( |
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312 _( |
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313 b"Due to skipped revisions, the first " |
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314 b"bad revision could be any of:\n" |
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315 ) |
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316 ) |
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317 for n in nodes: |
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318 displayer.show(repo[n]) |
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319 displayer.close() |