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annotate mercurial/destutil.py @ 26723:52d08a93de1f

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destupdate: extract logic based on obsolescence marker in 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 02:15:43 +0100
parents 6cd643a1d32c
children 7fc759c0c430
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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 destupdate(repo, clean=False, check=False):
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80 """destination for bare update operation
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81
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82 return (rev, movemark, activemark)
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83
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84 - rev: the revision to update to,
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85 - movemark: node to move the active bookmark from
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86 (cf bookmark.calculate update),
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87 - activemark: a bookmark to activate at the end of the update.
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88 """
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89 node = None
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90 wc = repo[None]
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91 movemark = activemark = None
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92
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93 node, movemark, activemark = _destupdateobs(repo, clean, check)
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94
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95 if node is None:
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96 # we also move the active bookmark, if any
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97 node, movemark = bookmarks.calculateupdate(repo.ui, repo, None)
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98 if node is not None:
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99 activemark = node
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100
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101 if node is None:
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102 try:
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103 node = repo.branchtip(wc.branch())
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104 except error.RepoLookupError:
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105 if wc.branch() == 'default': # no default branch!
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106 node = repo.lookup('tip') # update to tip
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107 else:
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108 raise error.Abort(_("branch %s not found") % wc.branch())
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109 rev = repo[node].rev()
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110
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111 _destupdatevalidate(repo, rev, clean, check)
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112
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113 return rev, movemark, activemark
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114
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115 def destmerge(repo):
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116 if repo._activebookmark:
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117 bmheads = repo.bookmarkheads(repo._activebookmark)
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118 curhead = repo[repo._activebookmark].node()
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119 if len(bmheads) == 2:
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120 if curhead == bmheads[0]:
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121 node = bmheads[1]
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122 else:
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123 node = bmheads[0]
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124 elif len(bmheads) > 2:
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125 raise error.Abort(_("multiple matching bookmarks to merge - "
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126 "please merge with an explicit rev or bookmark"),
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127 hint=_("run 'hg heads' to see all heads"))
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128 elif len(bmheads) <= 1:
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129 raise error.Abort(_("no matching bookmark to merge - "
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130 "please merge with an explicit rev or bookmark"),
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131 hint=_("run 'hg heads' to see all heads"))
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132 else:
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133 branch = repo[None].branch()
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134 bheads = repo.branchheads(branch)
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135 nbhs = [bh for bh in bheads if not repo[bh].bookmarks()]
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136
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137 if len(nbhs) > 2:
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138 raise error.Abort(_("branch '%s' has %d heads - "
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139 "please merge with an explicit rev")
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140 % (branch, len(bheads)),
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141 hint=_("run 'hg heads .' to see heads"))
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142
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143 parent = repo.dirstate.p1()
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144 if len(nbhs) <= 1:
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145 if len(bheads) > 1:
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146 raise error.Abort(_("heads are bookmarked - "
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147 "please merge with an explicit rev"),
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148 hint=_("run 'hg heads' to see all heads"))
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149 if len(repo.heads()) > 1:
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150 raise error.Abort(_("branch '%s' has one head - "
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151 "please merge with an explicit rev")
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152 % branch,
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153 hint=_("run 'hg heads' to see all heads"))
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154 msg, hint = _('nothing to merge'), None
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155 if parent != repo.lookup(branch):
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156 hint = _("use 'hg update' instead")
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157 raise error.Abort(msg, hint=hint)
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158
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159 if parent not in bheads:
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160 raise error.Abort(_('working directory not at a head revision'),
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161 hint=_("use 'hg update' or merge with an "
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162 "explicit revision"))
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163 if parent == nbhs[0]:
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164 node = nbhs[-1]
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165 else:
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166 node = nbhs[0]
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167 return repo[node].rev()