rebase: fix rebase with no common ancestors (issue4446)
The new rebase revset didn't check for the case when there are no common
ancestors. Now it does. The new behavior should be the same as the pre-3.2
behavior. Added a test.
# rebase.py - rebasing feature for mercurial
#
# Copyright 2008 Stefano Tortarolo <stefano.tortarolo at gmail dot com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''command to move sets of revisions to a different ancestor
This extension lets you rebase changesets in an existing Mercurial
repository.
For more information:
http://mercurial.selenic.com/wiki/RebaseExtension
'''
from mercurial import hg, util, repair, merge, cmdutil, commands, bookmarks
from mercurial import extensions, patch, scmutil, phases, obsolete, error
from mercurial import copies
from mercurial.commands import templateopts
from mercurial.node import nullrev
from mercurial.lock import release
from mercurial.i18n import _
import os, errno
nullmerge = -2
revignored = -3
cmdtable = {}
command = cmdutil.command(cmdtable)
testedwith = 'internal'
def _savegraft(ctx, extra):
s = ctx.extra().get('source', None)
if s is not None:
extra['source'] = s
def _savebranch(ctx, extra):
extra['branch'] = ctx.branch()
def _makeextrafn(copiers):
"""make an extrafn out of the given copy-functions.
A copy function takes a context and an extra dict, and mutates the
extra dict as needed based on the given context.
"""
def extrafn(ctx, extra):
for c in copiers:
c(ctx, extra)
return extrafn
@command('rebase',
[('s', 'source', '',
_('rebase the specified changeset and descendants'), _('REV')),
('b', 'base', '',
_('rebase everything from branching point of specified changeset'),
_('REV')),
('r', 'rev', [],
_('rebase these revisions'),
_('REV')),
('d', 'dest', '',
_('rebase onto the specified changeset'), _('REV')),
('', 'collapse', False, _('collapse the rebased changesets')),
('m', 'message', '',
_('use text as collapse commit message'), _('TEXT')),
('e', 'edit', False, _('invoke editor on commit messages')),
('l', 'logfile', '',
_('read collapse commit message from file'), _('FILE')),
('', 'keep', False, _('keep original changesets')),
('', 'keepbranches', False, _('keep original branch names')),
('D', 'detach', False, _('(DEPRECATED)')),
('i', 'interactive', False, _('(DEPRECATED)')),
('t', 'tool', '', _('specify merge tool')),
('c', 'continue', False, _('continue an interrupted rebase')),
('a', 'abort', False, _('abort an interrupted rebase'))] +
templateopts,
_('[-s REV | -b REV] [-d REV] [OPTION]'))
def rebase(ui, repo, **opts):
"""move changeset (and descendants) to a different branch
Rebase uses repeated merging to graft changesets from one part of
history (the source) onto another (the destination). This can be
useful for linearizing *local* changes relative to a master
development tree.
You should not rebase changesets that have already been shared
with others. Doing so will force everybody else to perform the
same rebase or they will end up with duplicated changesets after
pulling in your rebased changesets.
In its default configuration, Mercurial will prevent you from
rebasing published changes. See :hg:`help phases` for details.
If you don't specify a destination changeset (``-d/--dest``),
rebase uses the current branch tip as the destination. (The
destination changeset is not modified by rebasing, but new
changesets are added as its descendants.)
You can specify which changesets to rebase in two ways: as a
"source" changeset or as a "base" changeset. Both are shorthand
for a topologically related set of changesets (the "source
branch"). If you specify source (``-s/--source``), rebase will
rebase that changeset and all of its descendants onto dest. If you
specify base (``-b/--base``), rebase will select ancestors of base
back to but not including the common ancestor with dest. Thus,
``-b`` is less precise but more convenient than ``-s``: you can
specify any changeset in the source branch, and rebase will select
the whole branch. If you specify neither ``-s`` nor ``-b``, rebase
uses the parent of the working directory as the base.
For advanced usage, a third way is available through the ``--rev``
option. It allows you to specify an arbitrary set of changesets to
rebase. Descendants of revs you specify with this option are not
automatically included in the rebase.
By default, rebase recreates the changesets in the source branch
as descendants of dest and then destroys the originals. Use
``--keep`` to preserve the original source changesets. Some
changesets in the source branch (e.g. merges from the destination
branch) may be dropped if they no longer contribute any change.
One result of the rules for selecting the destination changeset
and source branch is that, unlike ``merge``, rebase will do
nothing if you are at the branch tip of a named branch
with two heads. You need to explicitly specify source and/or
destination (or ``update`` to the other head, if it's the head of
the intended source branch).
If a rebase is interrupted to manually resolve a merge, it can be
continued with --continue/-c or aborted with --abort/-a.
.. container:: verbose
Examples:
- move "local changes" (current commit back to branching point)
to the current branch tip after a pull::
hg rebase
- move a single changeset to the stable branch::
hg rebase -r 5f493448 -d stable
- splice a commit and all its descendants onto another part of history::
hg rebase --source c0c3 --dest 4cf9
- rebase everything on a branch marked by a bookmark onto the
default branch::
hg rebase --base myfeature --dest default
- collapse a sequence of changes into a single commit::
hg rebase --collapse -r 1520:1525 -d .
- move a named branch while preserving its name::
hg rebase -r "branch(featureX)" -d 1.3 --keepbranches
Returns 0 on success, 1 if nothing to rebase or there are
unresolved conflicts.
"""
originalwd = target = None
activebookmark = None
external = nullrev
state = {}
skipped = set()
targetancestors = set()
lock = wlock = None
try:
wlock = repo.wlock()
lock = repo.lock()
# Validate input and define rebasing points
destf = opts.get('dest', None)
srcf = opts.get('source', None)
basef = opts.get('base', None)
revf = opts.get('rev', [])
contf = opts.get('continue')
abortf = opts.get('abort')
collapsef = opts.get('collapse', False)
collapsemsg = cmdutil.logmessage(ui, opts)
e = opts.get('extrafn') # internal, used by e.g. hgsubversion
extrafns = [_savegraft]
if e:
extrafns = [e]
keepf = opts.get('keep', False)
keepbranchesf = opts.get('keepbranches', False)
# keepopen is not meant for use on the command line, but by
# other extensions
keepopen = opts.get('keepopen', False)
if opts.get('interactive'):
msg = _("interactive history editing is supported by the "
"'histedit' extension (see 'hg help histedit')")
raise util.Abort(msg)
if collapsemsg and not collapsef:
raise util.Abort(
_('message can only be specified with collapse'))
if contf or abortf:
if contf and abortf:
raise util.Abort(_('cannot use both abort and continue'))
if collapsef:
raise util.Abort(
_('cannot use collapse with continue or abort'))
if srcf or basef or destf:
raise util.Abort(
_('abort and continue do not allow specifying revisions'))
if opts.get('tool', False):
ui.warn(_('tool option will be ignored\n'))
try:
(originalwd, target, state, skipped, collapsef, keepf,
keepbranchesf, external, activebookmark) = restorestatus(repo)
except error.RepoLookupError:
if abortf:
clearstatus(repo)
repo.ui.warn(_('rebase aborted (no revision is removed,'
' only broken state is cleared)\n'))
return 0
else:
msg = _('cannot continue inconsistent rebase')
hint = _('use "hg rebase --abort" to clear broken state')
raise util.Abort(msg, hint=hint)
if abortf:
return abort(repo, originalwd, target, state)
else:
if srcf and basef:
raise util.Abort(_('cannot specify both a '
'source and a base'))
if revf and basef:
raise util.Abort(_('cannot specify both a '
'revision and a base'))
if revf and srcf:
raise util.Abort(_('cannot specify both a '
'revision and a source'))
cmdutil.checkunfinished(repo)
cmdutil.bailifchanged(repo)
if not destf:
# Destination defaults to the latest revision in the
# current branch
branch = repo[None].branch()
dest = repo[branch]
else:
dest = scmutil.revsingle(repo, destf)
if revf:
rebaseset = scmutil.revrange(repo, revf)
if not rebaseset:
ui.status(_('empty "rev" revision set - '
'nothing to rebase\n'))
return 1
elif srcf:
src = scmutil.revrange(repo, [srcf])
if not src:
ui.status(_('empty "source" revision set - '
'nothing to rebase\n'))
return 1
rebaseset = repo.revs('(%ld)::', src)
assert rebaseset
else:
base = scmutil.revrange(repo, [basef or '.'])
if not base:
ui.status(_('empty "base" revision set - '
"can't compute rebase set\n"))
return 1
commonanc = repo.revs('ancestor(%ld, %d)', base, dest).first()
if commonanc is not None:
rebaseset = repo.revs('(%d::(%ld) - %d)::',
commonanc, base, commonanc)
else:
rebaseset = []
if not rebaseset:
# transform to list because smartsets are not comparable to
# lists. This should be improved to honor lazyness of
# smartset.
if list(base) == [dest.rev()]:
if basef:
ui.status(_('nothing to rebase - %s is both "base"'
' and destination\n') % dest)
else:
ui.status(_('nothing to rebase - working directory '
'parent is also destination\n'))
elif not repo.revs('%ld - ::%d', base, dest):
if basef:
ui.status(_('nothing to rebase - "base" %s is '
'already an ancestor of destination '
'%s\n') %
('+'.join(str(repo[r]) for r in base),
dest))
else:
ui.status(_('nothing to rebase - working '
'directory parent is already an '
'ancestor of destination %s\n') % dest)
else: # can it happen?
ui.status(_('nothing to rebase from %s to %s\n') %
('+'.join(str(repo[r]) for r in base), dest))
return 1
allowunstable = obsolete.isenabled(repo, obsolete.allowunstableopt)
if (not (keepf or allowunstable)
and repo.revs('first(children(%ld) - %ld)',
rebaseset, rebaseset)):
raise util.Abort(
_("can't remove original changesets with"
" unrebased descendants"),
hint=_('use --keep to keep original changesets'))
result = buildstate(repo, dest, rebaseset, collapsef)
if not result:
# Empty state built, nothing to rebase
ui.status(_('nothing to rebase\n'))
return 1
root = min(rebaseset)
if not keepf and not repo[root].mutable():
raise util.Abort(_("can't rebase immutable changeset %s")
% repo[root],
hint=_('see hg help phases for details'))
originalwd, target, state = result
if collapsef:
targetancestors = repo.changelog.ancestors([target],
inclusive=True)
external = externalparent(repo, state, targetancestors)
if dest.closesbranch() and not keepbranchesf:
ui.status(_('reopening closed branch head %s\n') % dest)
if keepbranchesf:
# insert _savebranch at the start of extrafns so if
# there's a user-provided extrafn it can clobber branch if
# desired
extrafns.insert(0, _savebranch)
if collapsef:
branches = set()
for rev in state:
branches.add(repo[rev].branch())
if len(branches) > 1:
raise util.Abort(_('cannot collapse multiple named '
'branches'))
# Rebase
if not targetancestors:
targetancestors = repo.changelog.ancestors([target], inclusive=True)
# Keep track of the current bookmarks in order to reset them later
currentbookmarks = repo._bookmarks.copy()
activebookmark = activebookmark or repo._bookmarkcurrent
if activebookmark:
bookmarks.unsetcurrent(repo)
extrafn = _makeextrafn(extrafns)
sortedstate = sorted(state)
total = len(sortedstate)
pos = 0
for rev in sortedstate:
pos += 1
if state[rev] == -1:
ui.progress(_("rebasing"), pos, ("%d:%s" % (rev, repo[rev])),
_('changesets'), total)
p1, p2 = defineparents(repo, rev, target, state,
targetancestors)
storestatus(repo, originalwd, target, state, collapsef, keepf,
keepbranchesf, external, activebookmark)
if len(repo.parents()) == 2:
repo.ui.debug('resuming interrupted rebase\n')
else:
try:
ui.setconfig('ui', 'forcemerge', opts.get('tool', ''),
'rebase')
stats = rebasenode(repo, rev, p1, state, collapsef,
target)
if stats and stats[3] > 0:
raise error.InterventionRequired(
_('unresolved conflicts (see hg '
'resolve, then hg rebase --continue)'))
finally:
ui.setconfig('ui', 'forcemerge', '', 'rebase')
if not collapsef:
merging = repo[p2].rev() != nullrev
editform = cmdutil.mergeeditform(merging, 'rebase')
editor = cmdutil.getcommiteditor(editform=editform, **opts)
newrev = concludenode(repo, rev, p1, p2, extrafn=extrafn,
editor=editor)
else:
# Skip commit if we are collapsing
repo.dirstate.beginparentchange()
repo.setparents(repo[p1].node())
repo.dirstate.endparentchange()
newrev = None
# Update the state
if newrev is not None:
state[rev] = repo[newrev].rev()
else:
if not collapsef:
ui.note(_('no changes, revision %d skipped\n') % rev)
ui.debug('next revision set to %s\n' % p1)
skipped.add(rev)
state[rev] = p1
ui.progress(_('rebasing'), None)
ui.note(_('rebase merging completed\n'))
if collapsef and not keepopen:
p1, p2 = defineparents(repo, min(state), target,
state, targetancestors)
editopt = opts.get('edit')
editform = 'rebase.collapse'
if collapsemsg:
commitmsg = collapsemsg
else:
commitmsg = 'Collapsed revision'
for rebased in state:
if rebased not in skipped and state[rebased] > nullmerge:
commitmsg += '\n* %s' % repo[rebased].description()
editopt = True
editor = cmdutil.getcommiteditor(edit=editopt, editform=editform)
newrev = concludenode(repo, rev, p1, external, commitmsg=commitmsg,
extrafn=extrafn, editor=editor)
for oldrev in state.iterkeys():
if state[oldrev] > nullmerge:
state[oldrev] = newrev
if 'qtip' in repo.tags():
updatemq(repo, state, skipped, **opts)
if currentbookmarks:
# Nodeids are needed to reset bookmarks
nstate = {}
for k, v in state.iteritems():
if v > nullmerge:
nstate[repo[k].node()] = repo[v].node()
# XXX this is the same as dest.node() for the non-continue path --
# this should probably be cleaned up
targetnode = repo[target].node()
# restore original working directory
# (we do this before stripping)
newwd = state.get(originalwd, originalwd)
if newwd not in [c.rev() for c in repo[None].parents()]:
ui.note(_("update back to initial working directory parent\n"))
hg.updaterepo(repo, newwd, False)
if not keepf:
collapsedas = None
if collapsef:
collapsedas = newrev
clearrebased(ui, repo, state, skipped, collapsedas)
if currentbookmarks:
updatebookmarks(repo, targetnode, nstate, currentbookmarks)
if activebookmark not in repo._bookmarks:
# active bookmark was divergent one and has been deleted
activebookmark = None
clearstatus(repo)
ui.note(_("rebase completed\n"))
util.unlinkpath(repo.sjoin('undo'), ignoremissing=True)
if skipped:
ui.note(_("%d revisions have been skipped\n") % len(skipped))
if (activebookmark and
repo['.'].node() == repo._bookmarks[activebookmark]):
bookmarks.setcurrent(repo, activebookmark)
finally:
release(lock, wlock)
def externalparent(repo, state, targetancestors):
"""Return the revision that should be used as the second parent
when the revisions in state is collapsed on top of targetancestors.
Abort if there is more than one parent.
"""
parents = set()
source = min(state)
for rev in state:
if rev == source:
continue
for p in repo[rev].parents():
if (p.rev() not in state
and p.rev() not in targetancestors):
parents.add(p.rev())
if not parents:
return nullrev
if len(parents) == 1:
return parents.pop()
raise util.Abort(_('unable to collapse on top of %s, there is more '
'than one external parent: %s') %
(max(targetancestors),
', '.join(str(p) for p in sorted(parents))))
def concludenode(repo, rev, p1, p2, commitmsg=None, editor=None, extrafn=None):
'Commit the changes and store useful information in extra'
try:
repo.dirstate.beginparentchange()
repo.setparents(repo[p1].node(), repo[p2].node())
repo.dirstate.endparentchange()
ctx = repo[rev]
if commitmsg is None:
commitmsg = ctx.description()
extra = {'rebase_source': ctx.hex()}
if extrafn:
extrafn(ctx, extra)
backup = repo.ui.backupconfig('phases', 'new-commit')
try:
targetphase = max(ctx.phase(), phases.draft)
repo.ui.setconfig('phases', 'new-commit', targetphase, 'rebase')
# Commit might fail if unresolved files exist
newrev = repo.commit(text=commitmsg, user=ctx.user(),
date=ctx.date(), extra=extra, editor=editor)
finally:
repo.ui.restoreconfig(backup)
repo.dirstate.setbranch(repo[newrev].branch())
return newrev
except util.Abort:
# Invalidate the previous setparents
repo.dirstate.invalidate()
raise
def rebasenode(repo, rev, p1, state, collapse, target):
'Rebase a single revision'
# Merge phase
# Update to target and merge it with local
if repo['.'].rev() != repo[p1].rev():
repo.ui.debug(" update to %d:%s\n" % (repo[p1].rev(), repo[p1]))
merge.update(repo, p1, False, True, False)
else:
repo.ui.debug(" already in target\n")
repo.dirstate.write()
repo.ui.debug(" merge against %d:%s\n" % (repo[rev].rev(), repo[rev]))
if repo[rev].rev() == repo[min(state)].rev():
# Case (1) initial changeset of a non-detaching rebase.
# Let the merge mechanism find the base itself.
base = None
elif not repo[rev].p2():
# Case (2) detaching the node with a single parent, use this parent
base = repo[rev].p1().node()
else:
# In case of merge, we need to pick the right parent as merge base.
#
# Imagine we have:
# - M: currently rebase revision in this step
# - A: one parent of M
# - B: second parent of M
# - D: destination of this merge step (p1 var)
#
# If we are rebasing on D, D is the successors of A or B. The right
# merge base is the one D succeed to. We pretend it is B for the rest
# of this comment
#
# If we pick B as the base, the merge involves:
# - changes from B to M (actual changeset payload)
# - changes from B to D (induced by rebase) as D is a rebased
# version of B)
# Which exactly represent the rebase operation.
#
# If we pick the A as the base, the merge involves
# - changes from A to M (actual changeset payload)
# - changes from A to D (with include changes between unrelated A and B
# plus changes induced by rebase)
# Which does not represent anything sensible and creates a lot of
# conflicts.
for p in repo[rev].parents():
if state.get(p.rev()) == repo[p1].rev():
base = p.node()
break
else: # fallback when base not found
base = None
# Raise because this function is called wrong (see issue 4106)
raise AssertionError('no base found to rebase on '
'(rebasenode called wrong)')
if base is not None:
repo.ui.debug(" detach base %d:%s\n" % (repo[base].rev(), repo[base]))
# When collapsing in-place, the parent is the common ancestor, we
# have to allow merging with it.
stats = merge.update(repo, rev, True, True, False, base, collapse,
labels=['dest', 'source'])
if collapse:
copies.duplicatecopies(repo, rev, target)
else:
# If we're not using --collapse, we need to
# duplicate copies between the revision we're
# rebasing and its first parent, but *not*
# duplicate any copies that have already been
# performed in the destination.
p1rev = repo[rev].p1().rev()
copies.duplicatecopies(repo, rev, p1rev, skiprev=target)
return stats
def nearestrebased(repo, rev, state):
"""return the nearest ancestors of rev in the rebase result"""
rebased = [r for r in state if state[r] > nullmerge]
candidates = repo.revs('max(%ld and (::%d))', rebased, rev)
if candidates:
return state[candidates.first()]
else:
return None
def defineparents(repo, rev, target, state, targetancestors):
'Return the new parent relationship of the revision that will be rebased'
parents = repo[rev].parents()
p1 = p2 = nullrev
p1n = parents[0].rev()
if p1n in targetancestors:
p1 = target
elif p1n in state:
if state[p1n] == nullmerge:
p1 = target
elif state[p1n] == revignored:
p1 = nearestrebased(repo, p1n, state)
if p1 is None:
p1 = target
else:
p1 = state[p1n]
else: # p1n external
p1 = target
p2 = p1n
if len(parents) == 2 and parents[1].rev() not in targetancestors:
p2n = parents[1].rev()
# interesting second parent
if p2n in state:
if p1 == target: # p1n in targetancestors or external
p1 = state[p2n]
elif state[p2n] == revignored:
p2 = nearestrebased(repo, p2n, state)
if p2 is None:
# no ancestors rebased yet, detach
p2 = target
else:
p2 = state[p2n]
else: # p2n external
if p2 != nullrev: # p1n external too => rev is a merged revision
raise util.Abort(_('cannot use revision %d as base, result '
'would have 3 parents') % rev)
p2 = p2n
repo.ui.debug(" future parents are %d and %d\n" %
(repo[p1].rev(), repo[p2].rev()))
return p1, p2
def isagitpatch(repo, patchname):
'Return true if the given patch is in git format'
mqpatch = os.path.join(repo.mq.path, patchname)
for line in patch.linereader(file(mqpatch, 'rb')):
if line.startswith('diff --git'):
return True
return False
def updatemq(repo, state, skipped, **opts):
'Update rebased mq patches - finalize and then import them'
mqrebase = {}
mq = repo.mq
original_series = mq.fullseries[:]
skippedpatches = set()
for p in mq.applied:
rev = repo[p.node].rev()
if rev in state:
repo.ui.debug('revision %d is an mq patch (%s), finalize it.\n' %
(rev, p.name))
mqrebase[rev] = (p.name, isagitpatch(repo, p.name))
else:
# Applied but not rebased, not sure this should happen
skippedpatches.add(p.name)
if mqrebase:
mq.finish(repo, mqrebase.keys())
# We must start import from the newest revision
for rev in sorted(mqrebase, reverse=True):
if rev not in skipped:
name, isgit = mqrebase[rev]
repo.ui.debug('import mq patch %d (%s)\n' % (state[rev], name))
mq.qimport(repo, (), patchname=name, git=isgit,
rev=[str(state[rev])])
else:
# Rebased and skipped
skippedpatches.add(mqrebase[rev][0])
# Patches were either applied and rebased and imported in
# order, applied and removed or unapplied. Discard the removed
# ones while preserving the original series order and guards.
newseries = [s for s in original_series
if mq.guard_re.split(s, 1)[0] not in skippedpatches]
mq.fullseries[:] = newseries
mq.seriesdirty = True
mq.savedirty()
def updatebookmarks(repo, targetnode, nstate, originalbookmarks):
'Move bookmarks to their correct changesets, and delete divergent ones'
marks = repo._bookmarks
for k, v in originalbookmarks.iteritems():
if v in nstate:
# update the bookmarks for revs that have moved
marks[k] = nstate[v]
bookmarks.deletedivergent(repo, [targetnode], k)
marks.write()
def storestatus(repo, originalwd, target, state, collapse, keep, keepbranches,
external, activebookmark):
'Store the current status to allow recovery'
f = repo.opener("rebasestate", "w")
f.write(repo[originalwd].hex() + '\n')
f.write(repo[target].hex() + '\n')
f.write(repo[external].hex() + '\n')
f.write('%d\n' % int(collapse))
f.write('%d\n' % int(keep))
f.write('%d\n' % int(keepbranches))
f.write('%s\n' % (activebookmark or ''))
for d, v in state.iteritems():
oldrev = repo[d].hex()
if v > nullmerge:
newrev = repo[v].hex()
else:
newrev = v
f.write("%s:%s\n" % (oldrev, newrev))
f.close()
repo.ui.debug('rebase status stored\n')
def clearstatus(repo):
'Remove the status files'
util.unlinkpath(repo.join("rebasestate"), ignoremissing=True)
def restorestatus(repo):
'Restore a previously stored status'
try:
keepbranches = None
target = None
collapse = False
external = nullrev
activebookmark = None
state = {}
f = repo.opener("rebasestate")
for i, l in enumerate(f.read().splitlines()):
if i == 0:
originalwd = repo[l].rev()
elif i == 1:
target = repo[l].rev()
elif i == 2:
external = repo[l].rev()
elif i == 3:
collapse = bool(int(l))
elif i == 4:
keep = bool(int(l))
elif i == 5:
keepbranches = bool(int(l))
elif i == 6 and not (len(l) == 81 and ':' in l):
# line 6 is a recent addition, so for backwards compatibility
# check that the line doesn't look like the oldrev:newrev lines
activebookmark = l
else:
oldrev, newrev = l.split(':')
if newrev in (str(nullmerge), str(revignored)):
state[repo[oldrev].rev()] = int(newrev)
else:
state[repo[oldrev].rev()] = repo[newrev].rev()
if keepbranches is None:
raise util.Abort(_('.hg/rebasestate is incomplete'))
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' %
(' '.join(str(r) for r in sorted(skipped)) or None))
repo.ui.debug('rebase status resumed\n')
return (originalwd, target, state, skipped,
collapse, keep, keepbranches, external, activebookmark)
except IOError, err:
if err.errno != errno.ENOENT:
raise
raise util.Abort(_('no rebase in progress'))
def inrebase(repo, originalwd, state):
'''check whether the working dir is in an interrupted rebase'''
parents = [p.rev() for p in repo.parents()]
if originalwd in parents:
return True
for newrev in state.itervalues():
if newrev in parents:
return True
return False
def abort(repo, originalwd, target, state):
'Restore the repository to its original state'
dstates = [s for s in state.values() if s > nullrev]
immutable = [d for d in dstates if not repo[d].mutable()]
cleanup = True
if immutable:
repo.ui.warn(_("warning: can't clean up immutable changesets %s\n")
% ', '.join(str(repo[r]) for r in immutable),
hint=_('see hg help phases for details'))
cleanup = False
descendants = set()
if dstates:
descendants = set(repo.changelog.descendants(dstates))
if descendants - set(dstates):
repo.ui.warn(_("warning: new changesets detected on target branch, "
"can't strip\n"))
cleanup = False
if cleanup:
# Update away from the rebase if necessary
if inrebase(repo, originalwd, state):
merge.update(repo, repo[originalwd].rev(), False, True, False)
# Strip from the first rebased revision
rebased = filter(lambda x: x > -1 and x != target, state.values())
if rebased:
strippoints = [c.node() for c in repo.set('roots(%ld)', rebased)]
# no backup of rebased cset versions needed
repair.strip(repo.ui, repo, strippoints)
clearstatus(repo)
repo.ui.warn(_('rebase aborted\n'))
return 0
def buildstate(repo, dest, rebaseset, collapse):
'''Define which revisions are going to be rebased and where
repo: repo
dest: context
rebaseset: set of 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 (dest.node() in
[s.node for s in repo.mq.applied]):
raise util.Abort(_('cannot rebase onto an applied mq patch'))
roots = list(repo.set('roots(%ld)', rebaseset))
if not roots:
raise util.Abort(_('no matching revisions'))
roots.sort()
state = {}
detachset = set()
for root in roots:
commonbase = root.ancestor(dest)
if commonbase == root:
raise util.Abort(_('source is ancestor of destination'))
if commonbase == dest:
samebranch = root.branch() == dest.branch()
if not collapse and samebranch and root in dest.children():
repo.ui.debug('source is a child of destination\n')
return None
repo.ui.debug('rebase onto %d starting from %s\n' % (dest, root))
state.update(dict.fromkeys(rebaseset, nullrev))
# Rebase tries to turn <dest> into a parent of <root> while
# preserving the number of parents of rebased changesets:
#
# - A changeset with a single parent will always be rebased as a
# changeset with a single parent.
#
# - A merge will be rebased as merge unless its parents are both
# ancestors of <dest> or are themselves in the rebased set and
# pruned while rebased.
#
# If one parent of <root> is an ancestor of <dest>, the rebased
# version of this parent will be <dest>. This is always true with
# --base option.
#
# Otherwise, we need to *replace* the original parents with
# <dest>. This "detaches" the rebased set from its former location
# and rebases it onto <dest>. Changes introduced by ancestors of
# <root> not common with <dest> (the detachset, marked as
# nullmerge) are "removed" from the rebased changesets.
#
# - If <root> has a single parent, set it to <dest>.
#
# - If <root> is a merge, we cannot decide which parent to
# replace, the rebase operation is not clearly defined.
#
# The table below sums up this behavior:
#
# +------------------+----------------------+-------------------------+
# | | one parent | merge |
# +------------------+----------------------+-------------------------+
# | parent in | new parent is <dest> | parents in ::<dest> are |
# | ::<dest> | | remapped to <dest> |
# +------------------+----------------------+-------------------------+
# | unrelated source | new parent is <dest> | ambiguous, abort |
# +------------------+----------------------+-------------------------+
#
# The actual abort is handled by `defineparents`
if len(root.parents()) <= 1:
# ancestors of <root> not ancestors of <dest>
detachset.update(repo.changelog.findmissingrevs([commonbase.rev()],
[root.rev()]))
for r in detachset:
if r not in state:
state[r] = nullmerge
if len(roots) > 1:
# If we have multiple roots, we may have "hole" in the rebase set.
# Rebase roots that descend from those "hole" should not be detached as
# other root are. We use the special `revignored` to inform rebase that
# the revision should be ignored but that `defineparents` should search
# a rebase destination that make sense regarding rebased topology.
rebasedomain = set(repo.revs('%ld::%ld', rebaseset, rebaseset))
for ignored in set(rebasedomain) - set(rebaseset):
state[ignored] = revignored
return repo['.'].rev(), dest.rev(), state
def clearrebased(ui, repo, state, skipped, collapsedas=None):
"""dispose of rebased revision at the end of the rebase
If `collapsedas` is not None, the rebase was a collapse whose result if the
`collapsedas` node."""
if obsolete.isenabled(repo, obsolete.createmarkersopt):
markers = []
for rev, newrev in sorted(state.items()):
if newrev >= 0:
if rev in skipped:
succs = ()
elif collapsedas is not None:
succs = (repo[collapsedas],)
else:
succs = (repo[newrev],)
markers.append((repo[rev], succs))
if markers:
obsolete.createmarkers(repo, markers)
else:
rebased = [rev for rev in state if state[rev] > nullmerge]
if rebased:
stripped = []
for root in repo.set('roots(%ld)', rebased):
if set(repo.changelog.descendants([root.rev()])) - set(state):
ui.warn(_("warning: new changesets detected "
"on source branch, not stripping\n"))
else:
stripped.append(root.node())
if stripped:
# backup the old csets by default
repair.strip(ui, repo, stripped, "all")
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')
movemarkfrom = repo['.'].node()
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:
# --rev option from pull conflict with rebase own --rev
# dropping it
if 'rev' in opts:
del opts['rev']
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)
if bookmarks.update(repo, [movemarkfrom], repo['.'].node()):
ui.status(_("updating bookmark %s\n")
% repo._bookmarkcurrent)
else:
if opts.get('tool'):
raise util.Abort(_('--tool can only be used with --rebase'))
orig(ui, repo, *args, **opts)
def summaryhook(ui, repo):
if not os.path.exists(repo.join('rebasestate')):
return
try:
state = restorestatus(repo)[2]
except error.RepoLookupError:
# i18n: column positioning for "hg summary"
msg = _('rebase: (use "hg rebase --abort" to clear broken state)\n')
ui.write(msg)
return
numrebased = len([i for i in state.itervalues() if i != -1])
# i18n: column positioning for "hg summary"
ui.write(_('rebase: %s, %s (rebase --continue)\n') %
(ui.label(_('%d rebased'), 'rebase.rebased') % numrebased,
ui.label(_('%d remaining'), 'rebase.remaining') %
(len(state) - numrebased)))
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")))
entry[1].append(('t', 'tool', '',
_("specify merge tool for rebase")))
cmdutil.summaryhooks.add('rebase', summaryhook)
cmdutil.unfinishedstates.append(
['rebasestate', False, False, _('rebase in progress'),
_("use 'hg rebase --continue' or 'hg rebase --abort'")])