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annotate mercurial/destutil.py @ 26727:5b7fd48f9868

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destmerge: extract logic based on bookmark into its own function One of the main goal of having consolidated destination function is to allow extension to play with this logic. We extract sub logic to make is wrapping more practical.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Thu, 15 Oct 2015 03:13:14 +0100
parents 8e6649616699
children e8f1b7285917
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1 # destutil.py - Mercurial utility function for command destination
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2 #
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3 # Copyright Matt Mackall <mpm@selenic.com> and other
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from .i18n import _
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9 from . import (
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10 bookmarks,
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11 error,
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12 obsolete,
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13 )
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14
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15 def _destupdatevalidate(repo, rev, clean, check):
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16 """validate that the destination comply to various rules
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17
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18 This exists as its own function to help wrapping from extensions."""
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19 wc = repo[None]
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20 p1 = wc.p1()
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21 if not clean:
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22 # Check that the update is linear.
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23 #
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24 # Mercurial do not allow update-merge for non linear pattern
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25 # (that would be technically possible but was considered too confusing
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26 # for user a long time ago)
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27 #
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28 # See mercurial.merge.update for details
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29 if p1.rev() not in repo.changelog.ancestors([rev], inclusive=True):
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30 dirty = wc.dirty(missing=True)
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31 foreground = obsolete.foreground(repo, [p1.node()])
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32 if not repo[rev].node() in foreground:
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33 if dirty:
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34 msg = _("uncommitted changes")
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35 hint = _("commit and merge, or update --clean to"
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36 " discard changes")
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37 raise error.UpdateAbort(msg, hint=hint)
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38 elif not check: # destination is not a descendant.
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39 msg = _("not a linear update")
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40 hint = _("merge or update --check to force update")
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41 raise error.UpdateAbort(msg, hint=hint)
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42
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43 def _destupdateobs(repo, clean, check):
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44 """decide of an update destination from obsolescence markers"""
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45 node = None
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46 wc = repo[None]
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47 p1 = wc.p1()
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48 movemark = None
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49
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50 if p1.obsolete() and not p1.children():
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51 # allow updating to successors
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52 successors = obsolete.successorssets(repo, p1.node())
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53
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54 # behavior of certain cases is as follows,
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55 #
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56 # divergent changesets: update to highest rev, similar to what
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57 # is currently done when there are more than one head
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58 # (i.e. 'tip')
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59 #
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60 # replaced changesets: same as divergent except we know there
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61 # is no conflict
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62 #
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63 # pruned changeset: no update is done; though, we could
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64 # consider updating to the first non-obsolete parent,
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65 # similar to what is current done for 'hg prune'
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66
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67 if successors:
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68 # flatten the list here handles both divergent (len > 1)
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69 # and the usual case (len = 1)
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70 successors = [n for sub in successors for n in sub]
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71
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72 # get the max revision for the given successors set,
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73 # i.e. the 'tip' of a set
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74 node = repo.revs('max(%ln)', successors).first()
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75 if bookmarks.isactivewdirparent(repo):
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76 movemark = repo['.'].node()
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77 return node, movemark, None
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78
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79 def _destupdatebook(repo, clean, check):
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80 """decide on an update destination from active bookmark"""
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81 # we also move the active bookmark, if any
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82 activemark = None
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83 node, movemark = bookmarks.calculateupdate(repo.ui, repo, None)
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84 if node is not None:
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85 activemark = node
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86 return node, movemark, activemark
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87
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88 def _destupdatebranch(repo, clean, check):
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89 """decide on an update destination from current branch"""
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90 wc = repo[None]
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91 movemark = node = None
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92 try:
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93 node = repo.branchtip(wc.branch())
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94 if bookmarks.isactivewdirparent(repo):
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95 movemark = repo['.'].node()
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96 except error.RepoLookupError:
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97 if wc.branch() == 'default': # no default branch!
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98 node = repo.lookup('tip') # update to tip
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99 else:
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100 raise error.Abort(_("branch %s not found") % wc.branch())
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101 return node, movemark, None
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102
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103 # order in which each step should be evalutated
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104 # steps are run until one finds a destination
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105 destupdatesteps = ['evolution', 'bookmark', 'branch']
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106 # mapping to ease extension overriding steps.
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107 destupdatestepmap = {'evolution': _destupdateobs,
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108 'bookmark': _destupdatebook,
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109 'branch': _destupdatebranch,
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110 }
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111
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112 def destupdate(repo, clean=False, check=False):
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113 """destination for bare update operation
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114
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115 return (rev, movemark, activemark)
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116
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117 - rev: the revision to update to,
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118 - movemark: node to move the active bookmark from
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119 (cf bookmark.calculate update),
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120 - activemark: a bookmark to activate at the end of the update.
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121 """
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122 node = movemark = activemark = None
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123
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124 for step in destupdatesteps:
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125 node, movemark, activemark = destupdatestepmap[step](repo, clean, check)
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126 if node is not None:
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127 break
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128 rev = repo[node].rev()
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129
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130 _destupdatevalidate(repo, rev, clean, check)
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131
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132 return rev, movemark, activemark
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133
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134 def _destmergebook(repo):
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135 """find merge destination in the active bookmark case"""
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136 node = None
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137 bmheads = repo.bookmarkheads(repo._activebookmark)
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138 curhead = repo[repo._activebookmark].node()
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139 if len(bmheads) == 2:
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140 if curhead == bmheads[0]:
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141 node = bmheads[1]
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142 else:
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143 node = bmheads[0]
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144 elif len(bmheads) > 2:
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145 raise error.Abort(_("multiple matching bookmarks to merge - "
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146 "please merge with an explicit rev or bookmark"),
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147 hint=_("run 'hg heads' to see all heads"))
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148 elif len(bmheads) <= 1:
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149 raise error.Abort(_("no matching bookmark to merge - "
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150 "please merge with an explicit rev or bookmark"),
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151 hint=_("run 'hg heads' to see all heads"))
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152 assert node is not None
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153 return node
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154
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155 def destmerge(repo):
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156 if repo._activebookmark:
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157 node = _destmergebook(repo)
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158 else:
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159 branch = repo[None].branch()
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160 bheads = repo.branchheads(branch)
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161 nbhs = [bh for bh in bheads if not repo[bh].bookmarks()]
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162
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163 if len(nbhs) > 2:
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164 raise error.Abort(_("branch '%s' has %d heads - "
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165 "please merge with an explicit rev")
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166 % (branch, len(bheads)),
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167 hint=_("run 'hg heads .' to see heads"))
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168
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169 parent = repo.dirstate.p1()
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170 if len(nbhs) <= 1:
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171 if len(bheads) > 1:
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172 raise error.Abort(_("heads are bookmarked - "
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173 "please merge with an explicit rev"),
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174 hint=_("run 'hg heads' to see all heads"))
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175 if len(repo.heads()) > 1:
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176 raise error.Abort(_("branch '%s' has one head - "
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177 "please merge with an explicit rev")
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178 % branch,
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179 hint=_("run 'hg heads' to see all heads"))
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180 msg, hint = _('nothing to merge'), None
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181 if parent != repo.lookup(branch):
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182 hint = _("use 'hg update' instead")
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183 raise error.Abort(msg, hint=hint)
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184
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185 if parent not in bheads:
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186 raise error.Abort(_('working directory not at a head revision'),
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187 hint=_("use 'hg update' or merge with an "
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diff changeset
188 "explicit revision"))
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diff changeset
189 if parent == nbhs[0]:
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190 node = nbhs[-1]
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191 else:
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192 node = nbhs[0]
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193 return repo[node].rev()