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# rebase.py - rebasing feature for mercurial
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#
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# Copyright 2008 Stefano Tortarolo <stefano.tortarolo at gmail dot com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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'''command to move sets of revisions to a different ancestor
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This extension lets you rebase changesets in an existing Mercurial
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repository.
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For more information:
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http://mercurial.selenic.com/wiki/RebaseExtension
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'''
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from mercurial import hg, util, repair, merge, cmdutil, commands, error
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from mercurial import extensions, ancestor, copies, patch
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from mercurial.commands import templateopts
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from mercurial.node import nullrev
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from mercurial.lock import release
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from mercurial.i18n import _
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import os, errno
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nullmerge = -2
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def rebase(ui, repo, **opts):
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"""move changeset (and descendants) to a different branch
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Rebase uses repeated merging to graft changesets from one part of
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history (the source) onto another (the destination). This can be
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useful for linearizing *local* changes relative to a master
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development tree.
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You should not rebase changesets that have already been shared
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with others. Doing so will force everybody else to perform the
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same rebase or they will end up with duplicated changesets after
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pulling in your rebased changesets.
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If you don't specify a destination changeset (``-d/--dest``),
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rebase uses the tipmost head of the current named branch as the
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destination. (The destination changeset is not modified by
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rebasing, but new changesets are added as its descendants.)
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You can specify which changesets to rebase in two ways: as a
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"source" changeset or as a "base" changeset. Both are shorthand
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for a topologically related set of changesets (the "source
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branch"). If you specify source (``-s/--source``), rebase will
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rebase that changeset and all of its descendants onto dest. If you
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specify base (``-b/--base``), rebase will select ancestors of base
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back to but not including the common ancestor with dest. Thus,
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``-b`` is less precise but more convenient than ``-s``: you can
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specify any changeset in the source branch, and rebase will select
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the whole branch. If you specify neither ``-s`` nor ``-b``, rebase
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uses the parent of the working directory as the base.
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By default, rebase recreates the changesets in the source branch
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as descendants of dest and then destroys the originals. Use
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``--keep`` to preserve the original source changesets. Some
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changesets in the source branch (e.g. merges from the destination
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branch) may be dropped if they no longer contribute any change.
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One result of the rules for selecting the destination changeset
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and source branch is that, unlike ``merge``, rebase will do
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nothing if you are at the latest (tipmost) head of a named branch
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with two heads. You need to explicitly specify source and/or
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destination (or ``update`` to the other head, if it's the head of
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the intended source branch).
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If a rebase is interrupted to manually resolve a merge, it can be
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continued with --continue/-c or aborted with --abort/-a.
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Returns 0 on success, 1 if nothing to rebase.
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"""
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originalwd = target = None
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external = nullrev
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state = {}
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skipped = set()
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targetancestors = set()
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lock = wlock = None
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try:
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lock = repo.lock()
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wlock = repo.wlock()
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# Validate input and define rebasing points
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destf = opts.get('dest', None)
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srcf = opts.get('source', None)
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basef = opts.get('base', None)
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contf = opts.get('continue')
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abortf = opts.get('abort')
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collapsef = opts.get('collapse', False)
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extrafn = opts.get('extrafn')
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keepf = opts.get('keep', False)
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keepbranchesf = opts.get('keepbranches', False)
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detachf = opts.get('detach', False)
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# keepopen is not meant for use on the command line, but by
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# other extensions
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keepopen = opts.get('keepopen', False)
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if contf or abortf:
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if contf and abortf:
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raise util.Abort(_('cannot use both abort and continue'))
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if collapsef:
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raise util.Abort(
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_('cannot use collapse with continue or abort'))
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if detachf:
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raise util.Abort(_('cannot use detach with continue or abort'))
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if srcf or basef or destf:
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raise util.Abort(
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_('abort and continue do not allow specifying revisions'))
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(originalwd, target, state, skipped, collapsef, keepf,
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keepbranchesf, external) = restorestatus(repo)
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if abortf:
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return abort(repo, originalwd, target, state)
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else:
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if srcf and basef:
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raise util.Abort(_('cannot specify both a '
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'revision and a base'))
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if detachf:
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if not srcf:
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raise util.Abort(
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_('detach requires a revision to be specified'))
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if basef:
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raise util.Abort(_('cannot specify a base with detach'))
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cmdutil.bail_if_changed(repo)
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result = buildstate(repo, destf, srcf, basef, detachf)
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if not result:
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# Empty state built, nothing to rebase
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ui.status(_('nothing to rebase\n'))
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return 1
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else:
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originalwd, target, state = result
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if collapsef:
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targetancestors = set(repo.changelog.ancestors(target))
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external = checkexternal(repo, state, targetancestors)
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if keepbranchesf:
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if extrafn:
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raise util.Abort(_('cannot use both keepbranches and extrafn'))
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def extrafn(ctx, extra):
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extra['branch'] = ctx.branch()
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# Rebase
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if not targetancestors:
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targetancestors = set(repo.changelog.ancestors(target))
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targetancestors.add(target)
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for rev in sorted(state):
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if state[rev] == -1:
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ui.debug("rebasing %d:%s\n" % (rev, repo[rev]))
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storestatus(repo, originalwd, target, state, collapsef, keepf,
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keepbranchesf, external)
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p1, p2 = defineparents(repo, rev, target, state,
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targetancestors)
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if len(repo.parents()) == 2:
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repo.ui.debug('resuming interrupted rebase\n')
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else:
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stats = rebasenode(repo, rev, p1, p2, state)
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if stats and stats[3] > 0:
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raise util.Abort(_('fix unresolved conflicts with hg '
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'resolve then run hg rebase --continue'))
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updatedirstate(repo, rev, target, p2)
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if not collapsef:
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newrev = concludenode(repo, rev, p1, p2, extrafn=extrafn)
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else:
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# Skip commit if we are collapsing
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repo.dirstate.setparents(repo[p1].node())
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newrev = None
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# Update the state
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if newrev is not None:
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state[rev] = repo[newrev].rev()
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else:
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if not collapsef:
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ui.note(_('no changes, revision %d skipped\n') % rev)
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ui.debug('next revision set to %s\n' % p1)
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skipped.add(rev)
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state[rev] = p1
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ui.note(_('rebase merging completed\n'))
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if collapsef and not keepopen:
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p1, p2 = defineparents(repo, min(state), target,
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state, targetancestors)
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commitmsg = 'Collapsed revision'
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for rebased in state:
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if rebased not in skipped and state[rebased] != nullmerge:
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commitmsg += '\n* %s' % repo[rebased].description()
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commitmsg = ui.edit(commitmsg, repo.ui.username())
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newrev = concludenode(repo, rev, p1, external, commitmsg=commitmsg,
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extrafn=extrafn)
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if 'qtip' in repo.tags():
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updatemq(repo, state, skipped, **opts)
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if not keepf:
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# Remove no more useful revisions
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rebased = [rev for rev in state if state[rev] != nullmerge]
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if rebased:
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if set(repo.changelog.descendants(min(rebased))) - set(state):
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ui.warn(_("warning: new changesets detected "
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"on source branch, not stripping\n"))
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else:
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# backup the old csets by default
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repair.strip(ui, repo, repo[min(rebased)].node(), "all")
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clearstatus(repo)
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ui.note(_("rebase completed\n"))
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if os.path.exists(repo.sjoin('undo')):
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util.unlink(repo.sjoin('undo'))
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if skipped:
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ui.note(_("%d revisions have been skipped\n") % len(skipped))
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finally:
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release(lock, wlock)
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def rebasemerge(repo, rev, first=False):
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'return the correct ancestor'
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oldancestor = ancestor.ancestor
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def newancestor(a, b, pfunc):
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if b == rev:
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return repo[rev].parents()[0].rev()
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return oldancestor(a, b, pfunc)
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if not first:
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ancestor.ancestor = newancestor
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else:
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repo.ui.debug("first revision, do not change ancestor\n")
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try:
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stats = merge.update(repo, rev, True, True, False)
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return stats
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finally:
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ancestor.ancestor = oldancestor
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def checkexternal(repo, state, targetancestors):
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"""Check whether one or more external revisions need to be taken in
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consideration. In the latter case, abort.
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"""
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external = nullrev
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source = min(state)
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for rev in state:
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if rev == source:
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continue
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# Check externals and fail if there are more than one
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for p in repo[rev].parents():
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if (p.rev() not in state
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and p.rev() not in targetancestors):
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if external != nullrev:
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raise util.Abort(_('unable to collapse, there is more '
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'than one external parent'))
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external = p.rev()
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return external
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def updatedirstate(repo, rev, p1, p2):
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"""Keep track of renamed files in the revision that is going to be rebased
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"""
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# Here we simulate the copies and renames in the source changeset
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cop, diver = copies.copies(repo, repo[rev], repo[p1], repo[p2], True)
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m1 = repo[rev].manifest()
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m2 = repo[p1].manifest()
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for k, v in cop.iteritems():
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if k in m1:
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if v in m1 or v in m2:
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repo.dirstate.copy(v, k)
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if v in m2 and v not in m1:
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repo.dirstate.remove(v)
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def concludenode(repo, rev, p1, p2, commitmsg=None, extrafn=None):
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'Commit the changes and store useful information in extra'
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try:
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repo.dirstate.setparents(repo[p1].node(), repo[p2].node())
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ctx = repo[rev]
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if commitmsg is None:
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commitmsg = ctx.description()
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extra = {'rebase_source': ctx.hex()}
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if extrafn:
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extrafn(ctx, extra)
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# Commit might fail if unresolved files exist
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newrev = repo.commit(text=commitmsg, user=ctx.user(),
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date=ctx.date(), extra=extra)
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repo.dirstate.setbranch(repo[newrev].branch())
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return newrev
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except util.Abort:
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# Invalidate the previous setparents
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repo.dirstate.invalidate()
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raise
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def rebasenode(repo, rev, p1, p2, state):
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'Rebase a single revision'
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# Merge phase
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# Update to target and merge it with local
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if repo['.'].rev() != repo[p1].rev():
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repo.ui.debug(" update to %d:%s\n" % (repo[p1].rev(), repo[p1]))
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merge.update(repo, p1, False, True, False)
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else:
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repo.ui.debug(" already in target\n")
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repo.dirstate.write()
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repo.ui.debug(" merge against %d:%s\n" % (repo[rev].rev(), repo[rev]))
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first = repo[rev].rev() == repo[min(state)].rev()
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stats = rebasemerge(repo, rev, first)
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return stats
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def defineparents(repo, rev, target, state, targetancestors):
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'Return the new parent relationship of the revision that will be rebased'
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parents = repo[rev].parents()
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p1 = p2 = nullrev
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P1n = parents[0].rev()
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if P1n in targetancestors:
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p1 = target
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elif P1n in state:
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if state[P1n] == nullmerge:
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p1 = target
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else:
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p1 = state[P1n]
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else: # P1n external
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p1 = target
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p2 = P1n
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if len(parents) == 2 and parents[1].rev() not in targetancestors:
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P2n = parents[1].rev()
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# interesting second parent
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if P2n in state:
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if p1 == target: # P1n in targetancestors or external
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p1 = state[P2n]
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else:
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p2 = state[P2n]
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else: # P2n external
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if p2 != nullrev: # P1n external too => rev is a merged revision
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raise util.Abort(_('cannot use revision %d as base, result '
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'would have 3 parents') % rev)
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p2 = P2n
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repo.ui.debug(" future parents are %d and %d\n" %
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(repo[p1].rev(), repo[p2].rev()))
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return p1, p2
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def isagitpatch(repo, patchname):
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'Return true if the given patch is in git format'
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mqpatch = os.path.join(repo.mq.path, patchname)
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for line in patch.linereader(file(mqpatch, 'rb')):
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if line.startswith('diff --git'):
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return True
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return False
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def updatemq(repo, state, skipped, **opts):
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'Update rebased mq patches - finalize and then import them'
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mqrebase = {}
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mq = repo.mq
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for p in mq.applied:
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rev = repo[p.node].rev()
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if rev in state:
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repo.ui.debug('revision %d is an mq patch (%s), finalize it.\n' %
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(rev, p.name))
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mqrebase[rev] = (p.name, isagitpatch(repo, p.name))
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if mqrebase:
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mq.finish(repo, mqrebase.keys())
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# We must start import from the newest revision
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for rev in sorted(mqrebase, reverse=True):
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if rev not in skipped:
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name, isgit = mqrebase[rev]
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repo.ui.debug('import mq patch %d (%s)\n' % (state[rev], name))
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mq.qimport(repo, (), patchname=name, git=isgit,
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rev=[str(state[rev])])
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mq.save_dirty()
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def storestatus(repo, originalwd, target, state, collapse, keep, keepbranches,
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external):
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'Store the current status to allow recovery'
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f = repo.opener("rebasestate", "w")
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f.write(repo[originalwd].hex() + '\n')
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f.write(repo[target].hex() + '\n')
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f.write(repo[external].hex() + '\n')
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f.write('%d\n' % int(collapse))
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f.write('%d\n' % int(keep))
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f.write('%d\n' % int(keepbranches))
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for d, v in state.iteritems():
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oldrev = repo[d].hex()
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newrev = repo[v].hex()
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f.write("%s:%s\n" % (oldrev, newrev))
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f.close()
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repo.ui.debug('rebase status stored\n')
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def clearstatus(repo):
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'Remove the status files'
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if os.path.exists(repo.join("rebasestate")):
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util.unlink(repo.join("rebasestate"))
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def restorestatus(repo):
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'Restore a previously stored status'
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try:
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target = None
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collapse = False
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external = nullrev
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state = {}
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f = repo.opener("rebasestate")
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for i, l in enumerate(f.read().splitlines()):
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if i == 0:
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originalwd = repo[l].rev()
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elif i == 1:
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target = repo[l].rev()
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elif i == 2:
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external = repo[l].rev()
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elif i == 3:
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collapse = bool(int(l))
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elif i == 4:
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keep = bool(int(l))
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elif i == 5:
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keepbranches = bool(int(l))
|
|
|
else:
|
|
|
oldrev, newrev = l.split(':')
|
|
|
state[repo[oldrev].rev()] = repo[newrev].rev()
|
|
|
skipped = set()
|
|
|
# recompute the set of skipped revs
|
|
|
if not collapse:
|
|
|
seen = set([target])
|
|
|
for old, new in sorted(state.items()):
|
|
|
if new != nullrev and new in seen:
|
|
|
skipped.add(old)
|
|
|
seen.add(new)
|
|
|
repo.ui.debug('computed skipped revs: %s\n' % skipped)
|
|
|
repo.ui.debug('rebase status resumed\n')
|
|
|
return (originalwd, target, state, skipped,
|
|
|
collapse, keep, keepbranches, external)
|
|
|
except IOError, err:
|
|
|
if err.errno != errno.ENOENT:
|
|
|
raise
|
|
|
raise util.Abort(_('no rebase in progress'))
|
|
|
|
|
|
def abort(repo, originalwd, target, state):
|
|
|
'Restore the repository to its original state'
|
|
|
if set(repo.changelog.descendants(target)) - set(state.values()):
|
|
|
repo.ui.warn(_("warning: new changesets detected on target branch, "
|
|
|
"can't abort\n"))
|
|
|
return -1
|
|
|
else:
|
|
|
# Strip from the first rebased revision
|
|
|
merge.update(repo, repo[originalwd].rev(), False, True, False)
|
|
|
rebased = filter(lambda x: x > -1 and x != target, state.values())
|
|
|
if rebased:
|
|
|
strippoint = min(rebased)
|
|
|
# no backup of rebased cset versions needed
|
|
|
repair.strip(repo.ui, repo, repo[strippoint].node())
|
|
|
clearstatus(repo)
|
|
|
repo.ui.status(_('rebase aborted\n'))
|
|
|
return 0
|
|
|
|
|
|
def buildstate(repo, dest, src, base, detach):
|
|
|
'Define which revisions are going to be rebased and where'
|
|
|
targetancestors = set()
|
|
|
detachset = set()
|
|
|
|
|
|
if not dest:
|
|
|
# Destination defaults to the latest revision in the current branch
|
|
|
branch = repo[None].branch()
|
|
|
dest = repo[branch].rev()
|
|
|
else:
|
|
|
dest = repo[dest].rev()
|
|
|
|
|
|
# This check isn't strictly necessary, since mq detects commits over an
|
|
|
# applied patch. But it prevents messing up the working directory when
|
|
|
# a partially completed rebase is blocked by mq.
|
|
|
if 'qtip' in repo.tags() and (repo[dest].node() in
|
|
|
[s.node for s in repo.mq.applied]):
|
|
|
raise util.Abort(_('cannot rebase onto an applied mq patch'))
|
|
|
|
|
|
if src:
|
|
|
commonbase = repo[src].ancestor(repo[dest])
|
|
|
if commonbase == repo[src]:
|
|
|
raise util.Abort(_('source is ancestor of destination'))
|
|
|
if commonbase == repo[dest]:
|
|
|
raise util.Abort(_('source is descendant of destination'))
|
|
|
source = repo[src].rev()
|
|
|
if detach:
|
|
|
# We need to keep track of source's ancestors up to the common base
|
|
|
srcancestors = set(repo.changelog.ancestors(source))
|
|
|
baseancestors = set(repo.changelog.ancestors(commonbase.rev()))
|
|
|
detachset = srcancestors - baseancestors
|
|
|
detachset.remove(commonbase.rev())
|
|
|
else:
|
|
|
if base:
|
|
|
cwd = repo[base].rev()
|
|
|
else:
|
|
|
cwd = repo['.'].rev()
|
|
|
|
|
|
if cwd == dest:
|
|
|
repo.ui.debug('source and destination are the same\n')
|
|
|
return None
|
|
|
|
|
|
targetancestors = set(repo.changelog.ancestors(dest))
|
|
|
if cwd in targetancestors:
|
|
|
repo.ui.debug('source is ancestor of destination\n')
|
|
|
return None
|
|
|
|
|
|
cwdancestors = set(repo.changelog.ancestors(cwd))
|
|
|
if dest in cwdancestors:
|
|
|
repo.ui.debug('source is descendant of destination\n')
|
|
|
return None
|
|
|
|
|
|
cwdancestors.add(cwd)
|
|
|
rebasingbranch = cwdancestors - targetancestors
|
|
|
source = min(rebasingbranch)
|
|
|
|
|
|
repo.ui.debug('rebase onto %d starting from %d\n' % (dest, source))
|
|
|
state = dict.fromkeys(repo.changelog.descendants(source), nullrev)
|
|
|
state.update(dict.fromkeys(detachset, nullmerge))
|
|
|
state[source] = nullrev
|
|
|
return repo['.'].rev(), repo[dest].rev(), state
|
|
|
|
|
|
def pullrebase(orig, ui, repo, *args, **opts):
|
|
|
'Call rebase after pull if the latter has been invoked with --rebase'
|
|
|
if opts.get('rebase'):
|
|
|
if opts.get('update'):
|
|
|
del opts['update']
|
|
|
ui.debug('--update and --rebase are not compatible, ignoring '
|
|
|
'the update flag\n')
|
|
|
|
|
|
cmdutil.bail_if_changed(repo)
|
|
|
revsprepull = len(repo)
|
|
|
origpostincoming = commands.postincoming
|
|
|
def _dummy(*args, **kwargs):
|
|
|
pass
|
|
|
commands.postincoming = _dummy
|
|
|
try:
|
|
|
orig(ui, repo, *args, **opts)
|
|
|
finally:
|
|
|
commands.postincoming = origpostincoming
|
|
|
revspostpull = len(repo)
|
|
|
if revspostpull > revsprepull:
|
|
|
rebase(ui, repo, **opts)
|
|
|
branch = repo[None].branch()
|
|
|
dest = repo[branch].rev()
|
|
|
if dest != repo['.'].rev():
|
|
|
# there was nothing to rebase we force an update
|
|
|
hg.update(repo, dest)
|
|
|
else:
|
|
|
orig(ui, repo, *args, **opts)
|
|
|
|
|
|
def uisetup(ui):
|
|
|
'Replace pull with a decorator to provide --rebase option'
|
|
|
entry = extensions.wrapcommand(commands.table, 'pull', pullrebase)
|
|
|
entry[1].append(('', 'rebase', None,
|
|
|
_("rebase working directory to branch head"))
|
|
|
)
|
|
|
|
|
|
cmdtable = {
|
|
|
"rebase":
|
|
|
(rebase,
|
|
|
[
|
|
|
('s', 'source', '',
|
|
|
_('rebase from the specified changeset'), _('REV')),
|
|
|
('b', 'base', '',
|
|
|
_('rebase from the base of the specified changeset '
|
|
|
'(up to greatest common ancestor of base and dest)'),
|
|
|
_('REV')),
|
|
|
('d', 'dest', '',
|
|
|
_('rebase onto the specified changeset'), _('REV')),
|
|
|
('', 'collapse', False, _('collapse the rebased changesets')),
|
|
|
('', 'keep', False, _('keep original changesets')),
|
|
|
('', 'keepbranches', False, _('keep original branch names')),
|
|
|
('', 'detach', False, _('force detaching of source from its original '
|
|
|
'branch')),
|
|
|
('c', 'continue', False, _('continue an interrupted rebase')),
|
|
|
('a', 'abort', False, _('abort an interrupted rebase'))] +
|
|
|
templateopts,
|
|
|
_('hg rebase [-s REV | -b REV] [-d REV] [options]\n'
|
|
|
'hg rebase {-a|-c}'))
|
|
|
}
|
|
|
|
