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annotate mercurial/destutil.py @ 26714:9903261dcc81

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destutil: move default merge destination into a function Function in destutil are much simpler to wrap and more flexible than revset. This also help consistency as 'destupdate' live here and cannot become a pure revset anyway.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Thu, 15 Oct 2015 01:11:00 +0100
parents 634666c48b7d
children 6c22a17faa18
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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 destupdate(repo, clean=False, check=False):
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16 """destination for bare update operation
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17
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18 return (rev, movemark, activemark)
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19
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20 - rev: the revision to update to,
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21 - movemark: node to move the active bookmark from
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22 (cf bookmark.calculate update),
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23 - activemark: a bookmark to activate at the end of the update.
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24 """
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25 node = None
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26 wc = repo[None]
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27 p1 = wc.p1()
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28 activemark = None
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29
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30 # we also move the active bookmark, if any
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31 node, movemark = bookmarks.calculateupdate(repo.ui, repo, None)
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32 if node is not None:
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33 activemark = node
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34
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35 if node is None:
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36 try:
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37 node = repo.branchtip(wc.branch())
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38 except error.RepoLookupError:
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39 if wc.branch() == 'default': # no default branch!
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40 node = repo.lookup('tip') # update to tip
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41 else:
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42 raise error.Abort(_("branch %s not found") % wc.branch())
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43
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44 if p1.obsolete() and not p1.children():
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45 # allow updating to successors
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46 successors = obsolete.successorssets(repo, p1.node())
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47
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48 # behavior of certain cases is as follows,
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49 #
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50 # divergent changesets: update to highest rev, similar to what
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51 # is currently done when there are more than one head
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52 # (i.e. 'tip')
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53 #
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54 # replaced changesets: same as divergent except we know there
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55 # is no conflict
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56 #
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57 # pruned changeset: no update is done; though, we could
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58 # consider updating to the first non-obsolete parent,
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59 # similar to what is current done for 'hg prune'
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60
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61 if successors:
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62 # flatten the list here handles both divergent (len > 1)
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63 # and the usual case (len = 1)
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64 successors = [n for sub in successors for n in sub]
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65
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66 # get the max revision for the given successors set,
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67 # i.e. the 'tip' of a set
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68 node = repo.revs('max(%ln)', successors).first()
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69 rev = repo[node].rev()
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70
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71 if not clean:
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72 # Check that the update is linear.
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73 #
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74 # Mercurial do not allow update-merge for non linear pattern
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75 # (that would be technically possible but was considered too confusing
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76 # for user a long time ago)
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77 #
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78 # See mercurial.merge.update for details
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79 if p1.rev() not in repo.changelog.ancestors([rev], inclusive=True):
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80 dirty = wc.dirty(missing=True)
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81 foreground = obsolete.foreground(repo, [p1.node()])
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82 if not repo[rev].node() in foreground:
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83 if dirty:
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84 msg = _("uncommitted changes")
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85 hint = _("commit and merge, or update --clean to"
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86 " discard changes")
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87 raise error.UpdateAbort(msg, hint=hint)
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88 elif not check: # destination is not a descendant.
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89 msg = _("not a linear update")
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90 hint = _("merge or update --check to force update")
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91 raise error.UpdateAbort(msg, hint=hint)
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92
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93 return rev, movemark, activemark
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94
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95 def destmerge(repo):
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96 if repo._activebookmark:
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97 bmheads = repo.bookmarkheads(repo._activebookmark)
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98 curhead = repo[repo._activebookmark].node()
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99 if len(bmheads) == 2:
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100 if curhead == bmheads[0]:
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101 node = bmheads[1]
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102 else:
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103 node = bmheads[0]
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104 elif len(bmheads) > 2:
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105 raise error.Abort(_("multiple matching bookmarks to merge - "
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106 "please merge with an explicit rev or bookmark"),
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107 hint=_("run 'hg heads' to see all heads"))
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108 elif len(bmheads) <= 1:
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109 raise error.Abort(_("no matching bookmark to merge - "
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110 "please merge with an explicit rev or bookmark"),
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111 hint=_("run 'hg heads' to see all heads"))
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112 else:
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113 branch = repo[None].branch()
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114 bheads = repo.branchheads(branch)
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115 nbhs = [bh for bh in bheads if not repo[bh].bookmarks()]
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116
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117 if len(nbhs) > 2:
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118 raise error.Abort(_("branch '%s' has %d heads - "
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119 "please merge with an explicit rev")
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120 % (branch, len(bheads)),
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121 hint=_("run 'hg heads .' to see heads"))
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122
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123 parent = repo.dirstate.p1()
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124 if len(nbhs) <= 1:
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parents: 26683
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125 if len(bheads) > 1:
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parents: 26683
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126 raise error.Abort(_("heads are bookmarked - "
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parents: 26683
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127 "please merge with an explicit rev"),
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parents: 26683
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128 hint=_("run 'hg heads' to see all heads"))
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129 if len(repo.heads()) > 1:
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parents: 26683
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130 raise error.Abort(_("branch '%s' has one head - "
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parents: 26683
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131 "please merge with an explicit rev")
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parents: 26683
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132 % branch,
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parents: 26683
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133 hint=_("run 'hg heads' to see all heads"))
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parents: 26683
diff changeset
134 msg, hint = _('nothing to merge'), None
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parents: 26683
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135 if parent != repo.lookup(branch):
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parents: 26683
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136 hint = _("use 'hg update' instead")
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parents: 26683
diff changeset
137 raise error.Abort(msg, hint=hint)
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parents: 26683
diff changeset
138
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parents: 26683
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139 if parent not in bheads:
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parents: 26683
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140 raise error.Abort(_('working directory not at a head revision'),
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parents: 26683
diff changeset
141 hint=_("use 'hg update' or merge with an "
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parents: 26683
diff changeset
142 "explicit revision"))
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parents: 26683
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143 if parent == nbhs[0]:
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parents: 26683
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144 node = nbhs[-1]
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parents: 26683
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145 else:
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parents: 26683
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146 node = nbhs[0]
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parents: 26683
diff changeset
147 return repo[node].rev()