mirror of
https://github.com/facebook/sapling.git
synced 2024-10-10 16:57:49 +03:00
7e55f2106e
Summary: The tail check was flagging by mistake scenarios where the push was possible. This patch adds one of these scenario. Test Plan: Add new test and all former tests are passing Reviewers: ericsumner, durham Differential Revision: https://phabricator.fb.com/D2292866
446 lines
16 KiB
Python
446 lines
16 KiB
Python
# pushrebase.py - server-side rebasing of pushed commits
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#
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# Copyright 2014 Facebook, Inc.
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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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import errno, os, tempfile, sys, operator, resource
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try:
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import json
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except ImportError:
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import simplejson as json
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from mercurial import bundle2, cmdutil, hg, scmutil, exchange, commands
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from mercurial import util, error, discovery, changegroup, context, revset
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from mercurial import obsolete, pushkey, phases, extensions
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from mercurial.extensions import wrapcommand, wrapfunction, _order
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from mercurial.bundlerepo import bundlerepository
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from mercurial.node import nullid, hex, bin
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from mercurial.i18n import _
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cmdtable = {}
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command = cmdutil.command(cmdtable)
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rebaseparttype = 'b2x:rebase'
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commonheadsparttype = 'b2x:commonheads'
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experimental = 'experimental'
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configonto = 'server-rebase-onto'
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def uisetup(ui):
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# remotenames circumvents the default push implementation entirely, so make
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# sure we load after it so that we wrap it.
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_order.remove('pushrebase')
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_order.append('pushrebase')
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def extsetup(ui):
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entry = wrapcommand(commands.table, 'push', _push)
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try:
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# Don't add the 'to' arg if it already exists
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extensions.find('remotenames')
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except KeyError:
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entry[1].append(('', 'to', '', _('server revision to rebase onto')))
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partorder = exchange.b2partsgenorder
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partorder.insert(partorder.index('changeset'),
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partorder.pop(partorder.index(rebaseparttype)))
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partorder.insert(0, partorder.pop(partorder.index(commonheadsparttype)))
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wrapfunction(discovery, 'checkheads', _checkheads)
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origpushkeyhandler = bundle2.parthandlermapping['pushkey']
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newpushkeyhandler = lambda *args, **kwargs: \
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bundle2pushkey(origpushkeyhandler, *args, **kwargs)
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newpushkeyhandler.params = origpushkeyhandler.params
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bundle2.parthandlermapping['pushkey'] = newpushkeyhandler
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bundle2.parthandlermapping['b2x:pushkey'] = newpushkeyhandler
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def validaterevset(repo, revset):
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"Abort if this is a rebasable revset, return None otherwise"
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if not repo.revs(revset):
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raise util.Abort(_('nothing to rebase'))
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if repo.revs('%r and public()', revset):
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raise util.Abort(_('cannot rebase public changesets'))
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if repo.revs('%r and obsolete()', revset):
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raise util.Abort(_('cannot rebase obsolete changesets'))
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heads = repo.revs('heads(%r)', revset)
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if len(heads) > 1:
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raise util.Abort(_('cannot rebase divergent changesets'))
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repo.ui.note(_('validated revset for rebase\n'))
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def getrebasepart(repo, peer, outgoing, onto, newhead=False):
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if not outgoing.missing:
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raise util.Abort(_('no commits to rebase'))
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if rebaseparttype not in bundle2.bundle2caps(peer):
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raise util.Abort(_('no server support for %r') % rebaseparttype)
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validaterevset(repo, revset.formatspec('%ln', outgoing.missing))
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cg = changegroup.getlocalchangegroupraw(repo, 'push', outgoing)
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# .upper() marks this as a mandatory part: server will abort if there's no
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# handler
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return bundle2.bundlepart(rebaseparttype.upper(),
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mandatoryparams={'onto': onto,
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'newhead': repr(newhead),
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}.items(),
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data = cg)
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def _checkheads(orig, repo, remote, *args, **kwargs):
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onto = repo.ui.config(experimental, configonto)
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if onto: # This is a rebasing push
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# The rest of the checks are performed during bundle2 part processing;
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# we need to bypass the regular push checks because it will look like
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# we're pushing a new head, which isn't normally allowed
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if not repo.ui.configbool('experimental', 'bundle2-exp', False):
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raise util.Abort(_('bundle2 needs to be enabled on client'))
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if not remote.capable('bundle2-exp'):
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raise util.Abort(_('bundle2 needs to be enabled on server'))
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return
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else:
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return orig(repo, remote, *args, **kwargs)
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def _push(orig, ui, repo, *args, **opts):
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oldonto = ui.backupconfig(experimental, configonto)
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oldremotenames = ui.backupconfig('remotenames', 'allownonfastforward')
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oldphasemove = None
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try:
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ui.setconfig(experimental, configonto, opts.get('to'), '--to')
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if ui.config(experimental, configonto):
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ui.setconfig(experimental, 'bundle2.pushback', True)
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oldphasemove = wrapfunction(exchange, '_localphasemove', _phasemove)
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ui.setconfig('remotenames', 'allownonfastforward', True)
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result = orig(ui, repo, *args, **opts)
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finally:
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ui.restoreconfig(oldonto)
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ui.restoreconfig(oldremotenames)
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if oldphasemove:
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exchange._localphasemove = oldphasemove
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return result
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def _phasemove(orig, pushop, nodes, phase=phases.public):
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"""prevent commits from being marked public
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Since these are going to be mutated on the server, they aren't really being
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published, their successors are. If we mark these as public now, hg evolve
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will refuse to fix them for us later."""
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if phase != phases.public:
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orig(pushop, nodes, phase)
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@exchange.b2partsgenerator(commonheadsparttype)
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def commonheadspartgen(pushop, bundler):
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bundler.newpart(commonheadsparttype,
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data=''.join(pushop.outgoing.commonheads))
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@bundle2.parthandler(commonheadsparttype)
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def commonheadshandler(op, inpart):
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nodeid = inpart.read(20)
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while len(nodeid) == 20:
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op.records.add(commonheadsparttype, nodeid)
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nodeid = inpart.read(20)
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assert not nodeid # data should split evenly into blocks of 20 bytes
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@exchange.b2partsgenerator(rebaseparttype)
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def partgen(pushop, bundler):
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onto = pushop.ui.config(experimental, configonto)
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if 'changesets' in pushop.stepsdone or not onto:
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return
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pushop.stepsdone.add('changesets')
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if not pushop.outgoing.missing:
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# It's important that this text match the text found in upstream
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# Mercurial, since some tools rely on this string to know if a push
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# succeeded despite not pushing commits.
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pushop.ui.status(_('no changes found\n'))
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pushop.cgresult = 0
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return
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rebasepart = getrebasepart(pushop.repo,
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pushop.remote,
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pushop.outgoing,
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onto,
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pushop.newbranch)
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bundler.addpart(rebasepart)
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def handlereply(op):
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# server either succeeds or aborts; no code to read
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pushop.cgresult = 1
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return handlereply
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bundle2.capabilities[rebaseparttype] = ()
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def _makebundlefile(part):
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"""constructs a temporary bundle file
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part.data should be an uncompressed v1 changegroup"""
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fp = None
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fd, bundlefile = tempfile.mkstemp()
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try: # guards bundlefile
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try: # guards fp
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fp = os.fdopen(fd, 'wb')
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magic = 'HG10UN'
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fp.write(magic)
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data = part.read(resource.getpagesize() - len(magic))
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while data:
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fp.write(data)
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data = part.read(resource.getpagesize())
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finally:
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fp.close()
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except:
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try:
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os.unlink(bundlefile)
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except:
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# we would rather see the original exception
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pass
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raise
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return bundlefile
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def _getrevs(bundle, onto):
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'extracts and validates the revs to be imported'
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validaterevset(bundle, 'bundle()')
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revs = [bundle[r] for r in bundle.revs('sort(bundle())')]
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onto = bundle[onto.hex()]
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# Fast forward update, no rebase needed
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if list(bundle.set('bundle() & %d::', onto.rev())):
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return revs, onto
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if revs:
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# We want to rebase the highest bundle root that is an ancestor of
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# `onto`.
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oldonto = list(bundle.set('max(parents(bundle()) - bundle() & ::%d)',
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onto.rev()))
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if not oldonto:
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# If there's no shared history, only allow the rebase if the
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# incoming changes are completely distinct.
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sharedparents = list(bundle.set('parents(bundle()) - bundle()'))
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if not sharedparents:
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return revs, bundle[nullid]
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raise util.Abort(_('pushed commits do not branch from an ancestor '
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'of the desired destination %s' % onto.hex()))
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oldonto = oldonto[0]
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# Computes a list of all files that are in the changegroup, and diffs it
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# against all the files that changed between the old onto (ex: our old
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# bookmark location) and the new onto (ex: the server's actual bookmark
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# location). Since oldonto->onto is the distance of the rebase, this
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# should catch any conflicting changes.
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files = reduce(operator.or_, [set(rev.files()) for rev in revs], set())
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filematcher = scmutil.matchfiles(bundle, files)
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commonmanifest = oldonto.manifest().matches(filematcher)
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ontomanifest = onto.manifest().matches(filematcher)
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conflicts = ontomanifest.diff(commonmanifest).keys()
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if conflicts:
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raise util.Abort(_('conflicting changes in %r') % conflicts)
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return revs, oldonto
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def _graft(repo, rev, mapping):
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'''duplicate changeset "rev" with parents from "mapping"'''
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oldp1 = rev.p1().node()
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oldp2 = rev.p2().node()
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newp1 = mapping.get(oldp1, oldp1)
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newp2 = mapping.get(oldp2, oldp2)
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m = rev.manifest()
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def getfilectx(repo, memctx, path):
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if path in m:
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fctx = rev[path]
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flags = fctx.flags()
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copied = fctx.renamed()
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if copied:
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copied = copied[0]
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return context.memfilectx(repo, fctx.path(), fctx.data(),
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islink='l' in flags,
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isexec='x' in flags,
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copied=copied)
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else:
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return None
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# If the incoming commit has no parents, but requested a rebase,
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# allow it only for the first commit. The null/null commit will always
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# be the first commit since we only allow a nullid->nonnullid mapping if the
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# incoming commits are a completely distinct history (see `sharedparents` in
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# getrevs()), so there's no risk of commits with a single null parent
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# accidentally getting translated first.
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if oldp1 == nullid and oldp2 == nullid:
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if newp1 != nullid:
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newp2 = nullid
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del mapping[nullid]
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return context.memctx(repo,
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[newp1, newp2],
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rev.description(),
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rev.files(),
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getfilectx,
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rev.user(),
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rev.date(),
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rev.extra(),
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).commit()
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def _buildobsolete(replacements, oldrepo, newrepo):
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'adds obsolete markers in replacements if enabled in newrepo'
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if obsolete.isenabled(newrepo, obsolete.createmarkersopt):
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markers = [(oldrepo[oldrev], (newrepo[newrev],))
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for oldrev, newrev in replacements.items()
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if newrev != oldrev]
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obsolete.createmarkers(newrepo, markers)
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def _addpushbackchangegroup(repo, reply, outgoing):
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'''adds changegroup part to reply containing revs from outgoing.missing'''
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cgversions = set(reply.capabilities.get('changegroup'))
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if not cgversions:
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cgversions.add('01')
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version = max(cgversions & set(changegroup.packermap.keys()))
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cg = changegroup.getlocalchangegroupraw(repo,
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'rebase:reply',
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outgoing,
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version = version)
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cgpart = reply.newpart('CHANGEGROUP', data = cg)
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if version != '01':
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cgpart.addparam('version', version)
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def _addpushbackobsolete(repo, reply, newrevs):
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'''adds obsoletion markers to reply that are relevant to newrevs
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(if enabled)'''
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if (obsolete.isenabled(repo, obsolete.exchangeopt) and repo.obsstore):
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try:
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markers = repo.obsstore.relevantmarkers(newrevs)
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exchange.buildobsmarkerspart(reply, markers)
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except ValueError, exc:
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repo.ui.status(_("can't send obsolete markers: %s") % exc.message)
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def _addpushbackparts(op, replacements):
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'''adds pushback to reply if supported by the client'''
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if (op.records[commonheadsparttype]
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and op.reply
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and 'pushback' in op.reply.capabilities):
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outgoing = discovery.outgoing(op.repo.changelog,
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op.records[commonheadsparttype],
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[new for old, new in replacements.items()
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if old != new])
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if outgoing.missing:
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_addpushbackchangegroup(op.repo, op.reply, outgoing)
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_addpushbackobsolete(op.repo, op.reply, replacements.values())
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@bundle2.parthandler(rebaseparttype, ('onto', 'newhead'))
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def bundle2rebase(op, part):
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'''unbundle a bundle2 containing a changegroup to rebase'''
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params = part.params
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tr = op.gettransaction()
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hookargs = dict(tr.hookargs)
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bundlefile = None
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try:
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onto = scmutil.revsingle(op.repo, params['onto'])
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except error.RepoLookupError:
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# Probably a new bookmark. onto == None means don't do rebasing
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onto = None
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if not params['newhead']:
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if not op.repo.revs('%r and head()', params['onto']):
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raise util.Abort(_('rebase would produce a new head on server'))
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try: # guards bundlefile
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bundlefile = _makebundlefile(part)
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bundle = bundlerepository(op.repo.ui, op.repo.root, bundlefile)
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if onto == None:
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maxcommonanc = list(bundle.set('max(parents(bundle()) - bundle())'))
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if not maxcommonanc:
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onto = op.repo[nullid]
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else:
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onto = maxcommonanc[0]
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revs, oldonto = _getrevs(bundle, onto)
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op.repo.hook("prechangegroup", **hookargs)
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mapping = {}
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# Seed the mapping with oldonto->onto
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mapping[oldonto.node()] = onto.node()
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replacements = {}
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added = []
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for rev in revs:
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newrev = _graft(op.repo, rev, mapping)
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new = op.repo[newrev]
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oldnode = rev.node()
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newnode = new.node()
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replacements[oldnode] = newnode
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mapping[oldnode] = newnode
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added.append(newnode)
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_buildobsolete(replacements, bundle, op.repo)
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finally:
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try:
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if bundlefile:
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os.unlink(bundlefile)
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except OSError, e:
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if e.errno != errno.ENOENT:
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raise
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publishing = op.repo.ui.configbool('phases', 'publish', True)
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if publishing:
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phases.advanceboundary(op.repo, tr, phases.public, [added[-1]])
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p = lambda: tr.writepending() and op.repo.root or ""
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op.repo.hook("pretxnchangegroup", throw=True, pending=p, **hookargs)
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def runhooks():
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args = hookargs.copy()
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args['node'] = hex(added[0])
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op.repo.hook("changegroup", **args)
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for n in added:
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args = hookargs.copy()
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args['node'] = hex(n)
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op.repo.hook("incoming", **args)
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tr.addpostclose('serverrebase-cg-hooks',
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lambda tr: op.repo._afterlock(runhooks))
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_addpushbackparts(op, replacements)
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for k in replacements.keys():
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replacements[hex(k)] = hex(replacements[k])
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op.records.add(rebaseparttype, replacements)
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return 1
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def bundle2pushkey(orig, op, part):
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replacements = dict(sum([record.items()
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for record
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in op.records[rebaseparttype]],
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[]))
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namespace = pushkey.decode(part.params['namespace'])
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if namespace == 'phases':
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key = pushkey.decode(part.params['key'])
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part.params['key'] = pushkey.encode(replacements.get(key, key))
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if namespace == 'bookmarks':
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new = pushkey.decode(part.params['new'])
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part.params['new'] = pushkey.encode(replacements.get(new, new))
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return orig(op, part)
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