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annotate mercurial/destutil.py @ 26720:6c22a17faa18

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destupdate: extract validation logic 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 14:10:57 +0100
parents 9903261dcc81
children 3d094fbedf74
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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 destupdate(repo, clean=False, check=False):
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44 """destination for bare update operation
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45
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46 return (rev, movemark, activemark)
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47
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48 - rev: the revision to update to,
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49 - movemark: node to move the active bookmark from
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50 (cf bookmark.calculate update),
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51 - activemark: a bookmark to activate at the end of the update.
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52 """
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53 node = None
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54 wc = repo[None]
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55 p1 = wc.p1()
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56 activemark = None
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57
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58 # we also move the active bookmark, if any
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59 node, movemark = bookmarks.calculateupdate(repo.ui, repo, None)
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60 if node is not None:
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61 activemark = node
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62
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63 if node is None:
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64 try:
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65 node = repo.branchtip(wc.branch())
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66 except error.RepoLookupError:
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67 if wc.branch() == 'default': # no default branch!
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68 node = repo.lookup('tip') # update to tip
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69 else:
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70 raise error.Abort(_("branch %s not found") % wc.branch())
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71
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72 if p1.obsolete() and not p1.children():
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73 # allow updating to successors
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74 successors = obsolete.successorssets(repo, p1.node())
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75
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76 # behavior of certain cases is as follows,
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77 #
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78 # divergent changesets: update to highest rev, similar to what
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79 # is currently done when there are more than one head
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80 # (i.e. 'tip')
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81 #
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82 # replaced changesets: same as divergent except we know there
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83 # is no conflict
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84 #
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85 # pruned changeset: no update is done; though, we could
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86 # consider updating to the first non-obsolete parent,
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87 # similar to what is current done for 'hg prune'
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88
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89 if successors:
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90 # flatten the list here handles both divergent (len > 1)
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91 # and the usual case (len = 1)
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92 successors = [n for sub in successors for n in sub]
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93
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94 # get the max revision for the given successors set,
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95 # i.e. the 'tip' of a set
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96 node = repo.revs('max(%ln)', successors).first()
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97 rev = repo[node].rev()
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98
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99 _destupdatevalidate(repo, rev, clean, check)
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100
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101 return rev, movemark, activemark
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102
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103 def destmerge(repo):
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104 if repo._activebookmark:
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105 bmheads = repo.bookmarkheads(repo._activebookmark)
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106 curhead = repo[repo._activebookmark].node()
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107 if len(bmheads) == 2:
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108 if curhead == bmheads[0]:
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109 node = bmheads[1]
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110 else:
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111 node = bmheads[0]
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112 elif len(bmheads) > 2:
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113 raise error.Abort(_("multiple matching bookmarks to merge - "
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114 "please merge with an explicit rev or bookmark"),
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115 hint=_("run 'hg heads' to see all heads"))
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116 elif len(bmheads) <= 1:
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117 raise error.Abort(_("no matching bookmark to merge - "
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118 "please merge with an explicit rev or bookmark"),
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119 hint=_("run 'hg heads' to see all heads"))
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120 else:
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121 branch = repo[None].branch()
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122 bheads = repo.branchheads(branch)
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123 nbhs = [bh for bh in bheads if not repo[bh].bookmarks()]
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124
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125 if len(nbhs) > 2:
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126 raise error.Abort(_("branch '%s' has %d heads - "
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127 "please merge with an explicit rev")
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128 % (branch, len(bheads)),
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129 hint=_("run 'hg heads .' to see heads"))
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130
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131 parent = repo.dirstate.p1()
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132 if len(nbhs) <= 1:
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133 if len(bheads) > 1:
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134 raise error.Abort(_("heads are bookmarked - "
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135 "please merge with an explicit rev"),
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136 hint=_("run 'hg heads' to see all heads"))
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137 if len(repo.heads()) > 1:
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138 raise error.Abort(_("branch '%s' has one head - "
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139 "please merge with an explicit rev")
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parents: 26683
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140 % branch,
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141 hint=_("run 'hg heads' to see all heads"))
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142 msg, hint = _('nothing to merge'), None
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143 if parent != repo.lookup(branch):
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144 hint = _("use 'hg update' instead")
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145 raise error.Abort(msg, hint=hint)
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146
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147 if parent not in bheads:
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148 raise error.Abort(_('working directory not at a head revision'),
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149 hint=_("use 'hg update' or merge with an "
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150 "explicit revision"))
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151 if parent == nbhs[0]:
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152 node = nbhs[-1]
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153 else:
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154 node = nbhs[0]
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155 return repo[node].rev()