annotate hgext/narrow/narrowbundle2.py @ 42366:21e77ede77ab

narrow: factor out logic to build ellipses related b2parts in separate fn

This will help us switch more cleanly to using wireprotocol commands instead of
using exchange.pull() which exchanges more things then required.

Differential Revision: https://phab.mercurial-scm.org/D6435

# narrowbundle2.py - bundle2 extensions for narrow repository support
#
# Copyright 2017 Google, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import errno
import struct

from mercurial.i18n import _
from mercurial.node import (
    bin,
    nullid,
)
from mercurial import (
    bundle2,
    changegroup,
    error,
    exchange,
    localrepo,
    narrowspec,
    repair,
    repository,
    util,
    wireprototypes,
)
from mercurial.utils import (
    stringutil,
)

_NARROWACL_SECTION = 'narrowacl'
_CHANGESPECPART = 'narrow:changespec'
_RESSPECS = 'narrow:responsespec'
_SPECPART = 'narrow:spec'
_SPECPART_INCLUDE = 'include'
_SPECPART_EXCLUDE = 'exclude'
_KILLNODESIGNAL = 'KILL'
_DONESIGNAL = 'DONE'
_ELIDEDCSHEADER = '>20s20s20sl' # cset id, p1, p2, len(text)
_ELIDEDMFHEADER = '>20s20s20s20sl' # manifest id, p1, p2, link id, len(text)
_CSHEADERSIZE = struct.calcsize(_ELIDEDCSHEADER)
_MFHEADERSIZE = struct.calcsize(_ELIDEDMFHEADER)

# Serve a changegroup for a client with a narrow clone.
def getbundlechangegrouppart_narrow(bundler, repo, source,
                                    bundlecaps=None, b2caps=None, heads=None,
                                    common=None, **kwargs):
    assert repo.ui.configbool('experimental', 'narrowservebrokenellipses')

    cgversions = b2caps.get('changegroup')
    cgversions = [v for v in cgversions
                  if v in changegroup.supportedoutgoingversions(repo)]
    if not cgversions:
        raise ValueError(_('no common changegroup version'))
    version = max(cgversions)

    oldinclude = sorted(filter(bool, kwargs.get(r'oldincludepats', [])))
    oldexclude = sorted(filter(bool, kwargs.get(r'oldexcludepats', [])))
    newinclude = sorted(filter(bool, kwargs.get(r'includepats', [])))
    newexclude = sorted(filter(bool, kwargs.get(r'excludepats', [])))
    generateellipsesbundle2(bundler, repo, oldinclude, oldexclude, newinclude,
            newexclude, version, common, kwargs.get('known', []),
            kwargs.get(r'depth', None), heads)

def generateellipsesbundle2(bundler, repo, oldinclude, oldexclude, newinclude,
                            newexclude, version, common, known, depth, heads):
    newmatch = narrowspec.match(repo.root, include=newinclude,
                                exclude=newexclude)
    if depth is not None:
        depth = int(depth)
        if depth < 1:
            raise error.Abort(_('depth must be positive, got %d') % depth)

    heads = set(heads or repo.heads())
    common = set(common or [nullid])
    known = {bin(n) for n in known}
    if known and (oldinclude != newinclude or oldexclude != newexclude):
        # Steps:
        # 1. Send kill for "$known & ::common"
        #
        # 2. Send changegroup for ::common
        #
        # 3. Proceed.
        #
        # In the future, we can send kills for only the specific
        # nodes we know should go away or change shape, and then
        # send a data stream that tells the client something like this:
        #
        # a) apply this changegroup
        # b) apply nodes XXX, YYY, ZZZ that you already have
        # c) goto a
        #
        # until they've built up the full new state.
        # Convert to revnums and intersect with "common". The client should
        # have made it a subset of "common" already, but let's be safe.
        known = set(repo.revs("%ln & ::%ln", known, common))
        # TODO: we could send only roots() of this set, and the
        # list of nodes in common, and the client could work out
        # what to strip, instead of us explicitly sending every
        # single node.
        deadrevs = known
        def genkills():
            for r in deadrevs:
                yield _KILLNODESIGNAL
                yield repo.changelog.node(r)
            yield _DONESIGNAL
        bundler.newpart(_CHANGESPECPART, data=genkills())
        newvisit, newfull, newellipsis = exchange._computeellipsis(
            repo, set(), common, known, newmatch)
        if newvisit:
            packer = changegroup.getbundler(version, repo,
                                            matcher=newmatch,
                                            ellipses=True,
                                            shallow=depth is not None,
                                            ellipsisroots=newellipsis,
                                            fullnodes=newfull)
            cgdata = packer.generate(common, newvisit, False, 'narrow_widen')

            part = bundler.newpart('changegroup', data=cgdata)
            part.addparam('version', version)
            if 'treemanifest' in repo.requirements:
                part.addparam('treemanifest', '1')

    visitnodes, relevant_nodes, ellipsisroots = exchange._computeellipsis(
        repo, common, heads, set(), newmatch, depth=depth)

    repo.ui.debug('Found %d relevant revs\n' % len(relevant_nodes))
    if visitnodes:
        packer = changegroup.getbundler(version, repo,
                                        matcher=newmatch,
                                        ellipses=True,
                                        shallow=depth is not None,
                                        ellipsisroots=ellipsisroots,
                                        fullnodes=relevant_nodes)
        cgdata = packer.generate(common, visitnodes, False, 'narrow_widen')

        part = bundler.newpart('changegroup', data=cgdata)
        part.addparam('version', version)
        if 'treemanifest' in repo.requirements:
            part.addparam('treemanifest', '1')

@bundle2.parthandler(_SPECPART, (_SPECPART_INCLUDE, _SPECPART_EXCLUDE))
def _handlechangespec_2(op, inpart):
    # XXX: This bundle2 handling is buggy and should be removed after hg5.2 is
    # released. New servers will send a mandatory bundle2 part named
    # 'Narrowspec' and will send specs as data instead of params.
    # Refer to issue5952 and 6019
    includepats = set(inpart.params.get(_SPECPART_INCLUDE, '').splitlines())
    excludepats = set(inpart.params.get(_SPECPART_EXCLUDE, '').splitlines())
    narrowspec.validatepatterns(includepats)
    narrowspec.validatepatterns(excludepats)

    if not repository.NARROW_REQUIREMENT in op.repo.requirements:
        op.repo.requirements.add(repository.NARROW_REQUIREMENT)
        op.repo._writerequirements()
    op.repo.setnarrowpats(includepats, excludepats)
    narrowspec.copytoworkingcopy(op.repo)

@bundle2.parthandler(_RESSPECS)
def _handlenarrowspecs(op, inpart):
    data = inpart.read()
    inc, exc = data.split('\0')
    includepats = set(inc.splitlines())
    excludepats = set(exc.splitlines())
    narrowspec.validatepatterns(includepats)
    narrowspec.validatepatterns(excludepats)

    if repository.NARROW_REQUIREMENT not in op.repo.requirements:
        op.repo.requirements.add(repository.NARROW_REQUIREMENT)
        op.repo._writerequirements()
    op.repo.setnarrowpats(includepats, excludepats)
    narrowspec.copytoworkingcopy(op.repo)

@bundle2.parthandler(_CHANGESPECPART)
def _handlechangespec(op, inpart):
    repo = op.repo
    cl = repo.changelog

    # changesets which need to be stripped entirely. either they're no longer
    # needed in the new narrow spec, or the server is sending a replacement
    # in the changegroup part.
    clkills = set()

    # A changespec part contains all the updates to ellipsis nodes
    # that will happen as a result of widening or narrowing a
    # repo. All the changes that this block encounters are ellipsis
    # nodes or flags to kill an existing ellipsis.
    chunksignal = changegroup.readexactly(inpart, 4)
    while chunksignal != _DONESIGNAL:
        if chunksignal == _KILLNODESIGNAL:
            # a node used to be an ellipsis but isn't anymore
            ck = changegroup.readexactly(inpart, 20)
            if cl.hasnode(ck):
                clkills.add(ck)
        else:
            raise error.Abort(
                _('unexpected changespec node chunk type: %s') % chunksignal)
        chunksignal = changegroup.readexactly(inpart, 4)

    if clkills:
        # preserve bookmarks that repair.strip() would otherwise strip
        op._bookmarksbackup = repo._bookmarks
        class dummybmstore(dict):
            def applychanges(self, repo, tr, changes):
                pass
        localrepo.localrepository._bookmarks.set(repo, dummybmstore())
        chgrpfile = repair.strip(op.ui, repo, list(clkills), backup=True,
                                 topic='widen')
        if chgrpfile:
            op._widen_uninterr = repo.ui.uninterruptible()
            op._widen_uninterr.__enter__()
            # presence of _widen_bundle attribute activates widen handler later
            op._widen_bundle = chgrpfile
    # Set the new narrowspec if we're widening. The setnewnarrowpats() method
    # will currently always be there when using the core+narrowhg server, but
    # other servers may include a changespec part even when not widening (e.g.
    # because we're deepening a shallow repo).
    if util.safehasattr(repo, 'setnewnarrowpats'):
        repo.setnewnarrowpats()

def handlechangegroup_widen(op, inpart):
    """Changegroup exchange handler which restores temporarily-stripped nodes"""
    # We saved a bundle with stripped node data we must now restore.
    # This approach is based on mercurial/repair.py@6ee26a53c111.
    repo = op.repo
    ui = op.ui

    chgrpfile = op._widen_bundle
    del op._widen_bundle
    vfs = repo.vfs

    ui.note(_("adding branch\n"))
    f = vfs.open(chgrpfile, "rb")
    try:
        gen = exchange.readbundle(ui, f, chgrpfile, vfs)
        if not ui.verbose:
            # silence internal shuffling chatter
            ui.pushbuffer()
        if isinstance(gen, bundle2.unbundle20):
            with repo.transaction('strip') as tr:
                bundle2.processbundle(repo, gen, lambda: tr)
        else:
            gen.apply(repo, 'strip', 'bundle:' + vfs.join(chgrpfile), True)
        if not ui.verbose:
            ui.popbuffer()
    finally:
        f.close()

    # remove undo files
    for undovfs, undofile in repo.undofiles():
        try:
            undovfs.unlink(undofile)
        except OSError as e:
            if e.errno != errno.ENOENT:
                ui.warn(_('error removing %s: %s\n') %
                        (undovfs.join(undofile), stringutil.forcebytestr(e)))

    # Remove partial backup only if there were no exceptions
    op._widen_uninterr.__exit__(None, None, None)
    vfs.unlink(chgrpfile)

def setup():
    """Enable narrow repo support in bundle2-related extension points."""
    getbundleargs = wireprototypes.GETBUNDLE_ARGUMENTS

    getbundleargs['narrow'] = 'boolean'
    getbundleargs['depth'] = 'plain'
    getbundleargs['oldincludepats'] = 'csv'
    getbundleargs['oldexcludepats'] = 'csv'
    getbundleargs['known'] = 'csv'

    # Extend changegroup serving to handle requests from narrow clients.
    origcgfn = exchange.getbundle2partsmapping['changegroup']
    def wrappedcgfn(*args, **kwargs):
        repo = args[1]
        if repo.ui.has_section(_NARROWACL_SECTION):
            kwargs = exchange.applynarrowacl(repo, kwargs)

        if (kwargs.get(r'narrow', False) and
            repo.ui.configbool('experimental', 'narrowservebrokenellipses')):
            getbundlechangegrouppart_narrow(*args, **kwargs)
        else:
            origcgfn(*args, **kwargs)
    exchange.getbundle2partsmapping['changegroup'] = wrappedcgfn

    # Extend changegroup receiver so client can fixup after widen requests.
    origcghandler = bundle2.parthandlermapping['changegroup']
    def wrappedcghandler(op, inpart):
        origcghandler(op, inpart)
        if util.safehasattr(op, '_widen_bundle'):
            handlechangegroup_widen(op, inpart)
        if util.safehasattr(op, '_bookmarksbackup'):
            localrepo.localrepository._bookmarks.set(op.repo,
                                                     op._bookmarksbackup)
            del op._bookmarksbackup

    wrappedcghandler.params = origcghandler.params
    bundle2.parthandlermapping['changegroup'] = wrappedcghandler