server: introduce a 'experimental.single-head-per-branch' option
When the option is set, the repository will reject any transaction adding
multiple heads to the same named branch.
For now we reject all scenario with multiple heads. One could imagine handling
closed branches differently. We prefer to keep things simple for now. The
feature might get extended later. Branch closing is not the best experience
Mercurial has to offer anyway.
# uncommit - undo the actions of a commit
#
# Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
# Logilab SA <contact@logilab.fr>
# Pierre-Yves David <pierre-yves.david@ens-lyon.org>
# Patrick Mezard <patrick@mezard.eu>
# Copyright 2016 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""uncommit part or all of a local changeset (EXPERIMENTAL)
This command undoes the effect of a local commit, returning the affected
files to their uncommitted state. This means that files modified, added or
removed in the changeset will be left unchanged, and so will remain modified,
added and removed in the working directory.
"""
from __future__ import absolute_import
from mercurial.i18n import _
from mercurial import (
cmdutil,
commands,
context,
copies,
error,
node,
obsolete,
obsutil,
pycompat,
registrar,
scmutil,
)
cmdtable = {}
command = registrar.command(cmdtable)
configtable = {}
configitem = registrar.configitem(configtable)
configitem('experimental', 'uncommitondirtywdir',
default=False,
)
# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'ships-with-hg-core'
def _commitfiltered(repo, ctx, match, allowempty):
"""Recommit ctx with changed files not in match. Return the new
node identifier, or None if nothing changed.
"""
base = ctx.p1()
# ctx
initialfiles = set(ctx.files())
exclude = set(f for f in initialfiles if match(f))
# No files matched commit, so nothing excluded
if not exclude:
return None
files = (initialfiles - exclude)
# return the p1 so that we don't create an obsmarker later
if not files and not allowempty:
return ctx.parents()[0].node()
# Filter copies
copied = copies.pathcopies(base, ctx)
copied = dict((dst, src) for dst, src in copied.iteritems()
if dst in files)
def filectxfn(repo, memctx, path, contentctx=ctx, redirect=()):
if path not in contentctx:
return None
fctx = contentctx[path]
mctx = context.memfilectx(repo, fctx.path(), fctx.data(),
fctx.islink(),
fctx.isexec(),
copied=copied.get(path))
return mctx
new = context.memctx(repo,
parents=[base.node(), node.nullid],
text=ctx.description(),
files=files,
filectxfn=filectxfn,
user=ctx.user(),
date=ctx.date(),
extra=ctx.extra())
# phase handling
commitphase = ctx.phase()
overrides = {('phases', 'new-commit'): commitphase}
with repo.ui.configoverride(overrides, 'uncommit'):
newid = repo.commitctx(new)
return newid
def _fixdirstate(repo, oldctx, newctx, status):
""" fix the dirstate after switching the working directory from oldctx to
newctx which can be result of either unamend or uncommit.
"""
ds = repo.dirstate
copies = dict(ds.copies())
s = status
for f in s.modified:
if ds[f] == 'r':
# modified + removed -> removed
continue
ds.normallookup(f)
for f in s.added:
if ds[f] == 'r':
# added + removed -> unknown
ds.drop(f)
elif ds[f] != 'a':
ds.add(f)
for f in s.removed:
if ds[f] == 'a':
# removed + added -> normal
ds.normallookup(f)
elif ds[f] != 'r':
ds.remove(f)
# Merge old parent and old working dir copies
oldcopies = {}
for f in (s.modified + s.added):
src = oldctx[f].renamed()
if src:
oldcopies[f] = src[0]
oldcopies.update(copies)
copies = dict((dst, oldcopies.get(src, src))
for dst, src in oldcopies.iteritems())
# Adjust the dirstate copies
for dst, src in copies.iteritems():
if (src not in newctx or dst in newctx or ds[dst] != 'a'):
src = None
ds.copy(src, dst)
@command('uncommit',
[('', 'keep', False, _('allow an empty commit after uncommiting')),
] + commands.walkopts,
_('[OPTION]... [FILE]...'))
def uncommit(ui, repo, *pats, **opts):
"""uncommit part or all of a local changeset
This command undoes the effect of a local commit, returning the affected
files to their uncommitted state. This means that files modified or
deleted in the changeset will be left unchanged, and so will remain
modified in the working directory.
"""
opts = pycompat.byteskwargs(opts)
with repo.wlock(), repo.lock():
wctx = repo[None]
if not pats and not repo.ui.configbool('experimental',
'uncommitondirtywdir'):
cmdutil.bailifchanged(repo)
if wctx.parents()[0].node() == node.nullid:
raise error.Abort(_("cannot uncommit null changeset"))
if len(wctx.parents()) > 1:
raise error.Abort(_("cannot uncommit while merging"))
old = repo['.']
if not old.mutable():
raise error.Abort(_('cannot uncommit public changesets'))
if len(old.parents()) > 1:
raise error.Abort(_("cannot uncommit merge changeset"))
allowunstable = obsolete.isenabled(repo, obsolete.allowunstableopt)
if not allowunstable and old.children():
raise error.Abort(_('cannot uncommit changeset with children'))
with repo.transaction('uncommit'):
match = scmutil.match(old, pats, opts)
newid = _commitfiltered(repo, old, match, opts.get('keep'))
if newid is None:
ui.status(_("nothing to uncommit\n"))
return 1
mapping = {}
if newid != old.p1().node():
# Move local changes on filtered changeset
mapping[old.node()] = (newid,)
else:
# Fully removed the old commit
mapping[old.node()] = ()
scmutil.cleanupnodes(repo, mapping, 'uncommit')
with repo.dirstate.parentchange():
repo.dirstate.setparents(newid, node.nullid)
s = repo.status(old.p1(), old, match=match)
_fixdirstate(repo, old, repo[newid], s)
def predecessormarkers(ctx):
"""yields the obsolete markers marking the given changeset as a successor"""
for data in ctx.repo().obsstore.predecessors.get(ctx.node(), ()):
yield obsutil.marker(ctx.repo(), data)
@command('^unamend', [])
def unamend(ui, repo, **opts):
"""
undo the most recent amend operation on a current changeset
This command will roll back to the previous version of a changeset,
leaving working directory in state in which it was before running
`hg amend` (e.g. files modified as part of an amend will be
marked as modified `hg status`)
"""
unfi = repo.unfiltered()
# identify the commit from which to unamend
curctx = repo['.']
with repo.wlock(), repo.lock(), repo.transaction('unamend'):
if not curctx.mutable():
raise error.Abort(_('cannot unamend public changesets'))
# identify the commit to which to unamend
markers = list(predecessormarkers(curctx))
if len(markers) != 1:
e = _("changeset must have one predecessor, found %i predecessors")
raise error.Abort(e % len(markers))
prednode = markers[0].prednode()
predctx = unfi[prednode]
if curctx.children():
raise error.Abort(_("cannot unamend a changeset with children"))
# add an extra so that we get a new hash
# note: allowing unamend to undo an unamend is an intentional feature
extras = predctx.extra()
extras['unamend_source'] = curctx.node()
def filectxfn(repo, ctx_, path):
try:
return predctx.filectx(path)
except KeyError:
return None
# Make a new commit same as predctx
newctx = context.memctx(repo,
parents=(predctx.p1(), predctx.p2()),
text=predctx.description(),
files=predctx.files(),
filectxfn=filectxfn,
user=predctx.user(),
date=predctx.date(),
extra=extras)
# phase handling
commitphase = curctx.phase()
overrides = {('phases', 'new-commit'): commitphase}
with repo.ui.configoverride(overrides, 'uncommit'):
newprednode = repo.commitctx(newctx)
newpredctx = repo[newprednode]
changedfiles = []
wctx = repo[None]
wm = wctx.manifest()
cm = newpredctx.manifest()
dirstate = repo.dirstate
diff = cm.diff(wm)
changedfiles.extend(diff.iterkeys())
with dirstate.parentchange():
dirstate.setparents(newprednode, node.nullid)
s = repo.status(predctx, curctx)
_fixdirstate(repo, curctx, newpredctx, s)
mapping = {curctx.node(): (newprednode,)}
scmutil.cleanupnodes(repo, mapping, 'unamend')