view mercurial/upgrade_utils/engine.py @ 46150:a132aa5979ec

copies: no longer cache the ChangedFiles during copy tracing Now that the copies information for both parents are processed all at once, we no longer needs to cache this information, so we simplify the code. The simpler code is also a (tiny) bit faster overall. Repo Case Source-Rev Dest-Rev # of revisions old time new time Difference Factor time per rev --------------------------------------------------------------------------------------------------------------------------------------------------------------- mercurial x_revs_x_added_0_copies ad6b123de1c7 39cfcef4f463 : 1 revs, 0.000041 s, 0.000041 s, +0.000000 s, × 1.0000, 41 µs/rev mercurial x_revs_x_added_x_copies 2b1c78674230 0c1d10351869 : 6 revs, 0.000102 s, 0.000096 s, -0.000006 s, × 0.9412, 16 µs/rev mercurial x000_revs_x000_added_x_copies 81f8ff2a9bf2 dd3267698d84 : 1032 revs, 0.004254 s, 0.004039 s, -0.000215 s, × 0.9495, 3 µs/rev pypy x_revs_x_added_0_copies aed021ee8ae8 099ed31b181b : 9 revs, 0.000282 s, 0.000189 s, -0.000093 s, × 0.6702, 21 µs/rev pypy x_revs_x000_added_0_copies 4aa4e1f8e19a 359343b9ac0e : 1 revs, 0.000048 s, 0.000047 s, -0.000001 s, × 0.9792, 47 µs/rev pypy x_revs_x_added_x_copies ac52eb7bbbb0 72e022663155 : 7 revs, 0.000211 s, 0.000103 s, -0.000108 s, × 0.4882, 14 µs/rev pypy x_revs_x00_added_x_copies c3b14617fbd7 ace7255d9a26 : 1 revs, 0.000375 s, 0.000286 s, -0.000089 s, × 0.7627, 286 µs/rev pypy x_revs_x000_added_x000_copies df6f7a526b60 a83dc6a2d56f : 6 revs, 0.010574 s, 0.010436 s, -0.000138 s, × 0.9869, 1739 µs/rev pypy x000_revs_xx00_added_0_copies 89a76aede314 2f22446ff07e : 4785 revs, 0.049974 s, 0.047465 s, -0.002509 s, × 0.9498, 9 µs/rev pypy x000_revs_x000_added_x_copies 8a3b5bfd266e 2c68e87c3efe : 6780 revs, 0.084300 s, 0.082351 s, -0.001949 s, × 0.9769, 12 µs/rev pypy x000_revs_x000_added_x000_copies 89a76aede314 7b3dda341c84 : 5441 revs, 0.060128 s, 0.058757 s, -0.001371 s, × 0.9772, 10 µs/rev pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 43645 revs, 0.686542 s, 0.674129 s, -0.012413 s, × 0.9819, 15 µs/rev pypy x0000_revs_xx000_added_0_copies bf2c629d0071 4ffed77c095c : 2 revs, 0.009277 s, 0.009434 s, +0.000157 s, × 1.0169, 4717 µs/rev pypy x0000_revs_xx000_added_x000_copies 08ea3258278e d9fa043f30c0 : 11316 revs, 0.114733 s, 0.111935 s, -0.002798 s, × 0.9756, 9 µs/rev netbeans x_revs_x_added_0_copies fb0955ffcbcd a01e9239f9e7 : 2 revs, 0.000081 s, 0.000078 s, -0.000003 s, × 0.9630, 39 µs/rev netbeans x_revs_x000_added_0_copies 6f360122949f 20eb231cc7d0 : 2 revs, 0.000107 s, 0.000106 s, -0.000001 s, × 0.9907, 53 µs/rev netbeans x_revs_x_added_x_copies 1ada3faf6fb6 5a39d12eecf4 : 3 revs, 0.000173 s, 0.000162 s, -0.000011 s, × 0.9364, 54 µs/rev netbeans x_revs_x00_added_x_copies 35be93ba1e2c 9eec5e90c05f : 9 revs, 0.000698 s, 0.000695 s, -0.000003 s, × 0.9957, 77 µs/rev netbeans x000_revs_xx00_added_0_copies eac3045b4fdd 51d4ae7f1290 : 1421 revs, 0.009248 s, 0.008901 s, -0.000347 s, × 0.9625, 6 µs/rev netbeans x000_revs_x000_added_x_copies e2063d266acd 6081d72689dc : 1533 revs, 0.015446 s, 0.014333 s, -0.001113 s, × 0.9279, 9 µs/rev netbeans x000_revs_x000_added_x000_copies ff453e9fee32 411350406ec2 : 5750 revs, 0.074373 s, 0.071998 s, -0.002375 s, × 0.9681, 12 µs/rev netbeans x0000_revs_xx000_added_x000_copies 588c2d1ced70 1aad62e59ddd : 66949 revs, 0.639870 s, 0.615346 s, -0.024524 s, × 0.9617, 9 µs/rev mozilla-central x_revs_x_added_0_copies 3697f962bb7b 7015fcdd43a2 : 2 revs, 0.000088 s, 0.000085 s, -0.000003 s, × 0.9659, 42 µs/rev mozilla-central x_revs_x000_added_0_copies dd390860c6c9 40d0c5bed75d : 8 revs, 0.000199 s, 0.000199 s, +0.000000 s, × 1.0000, 24 µs/rev mozilla-central x_revs_x_added_x_copies 8d198483ae3b 14207ffc2b2f : 9 revs, 0.000171 s, 0.000169 s, -0.000002 s, × 0.9883, 18 µs/rev mozilla-central x_revs_x00_added_x_copies 98cbc58cc6bc 446a150332c3 : 7 revs, 0.000592 s, 0.000590 s, -0.000002 s, × 0.9966, 84 µs/rev mozilla-central x_revs_x000_added_x000_copies 3c684b4b8f68 0a5e72d1b479 : 3 revs, 0.003151 s, 0.003122 s, -0.000029 s, × 0.9908, 1040 µs/rev mozilla-central x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 6 revs, 0.061612 s, 0.061192 s, -0.000420 s, × 0.9932, 10198 µs/rev mozilla-central x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 1593 revs, 0.005381 s, 0.005137 s, -0.000244 s, × 0.9547, 3 µs/rev mozilla-central x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 41 revs, 0.003742 s, 0.003585 s, -0.000157 s, × 0.9580, 87 µs/rev mozilla-central x000_revs_x000_added_x000_copies 7c97034feb78 4407bd0c6330 : 7839 revs, 0.061983 s, 0.060592 s, -0.001391 s, × 0.9776, 7 µs/rev mozilla-central x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 615 revs, 0.019861 s, 0.019596 s, -0.000265 s, × 0.9867, 31 µs/rev mozilla-central x0000_revs_xx000_added_x000_copies f78c615a656c 96a38b690156 : 30263 revs, 0.188101 s, 0.183558 s, -0.004543 s, × 0.9758, 6 µs/rev mozilla-central x00000_revs_x0000_added_x0000_copies 6832ae71433c 4c222a1d9a00 : 153721 revs, 1.806696 s, 1.758083 s, -0.048613 s, × 0.9731, 11 µs/rev mozilla-central x00000_revs_x00000_added_x000_copies 76caed42cf7c 1daa622bbe42 : 204976 revs, 2.682987 s, 2.592955 s, -0.090032 s, × 0.9664, 12 µs/rev mozilla-try x_revs_x_added_0_copies aaf6dde0deb8 9790f499805a : 2 revs, 0.000852 s, 0.000844 s, -0.000008 s, × 0.9906, 422 µs/rev mozilla-try x_revs_x000_added_0_copies d8d0222927b4 5bb8ce8c7450 : 2 revs, 0.000859 s, 0.000861 s, +0.000002 s, × 1.0023, 430 µs/rev mozilla-try x_revs_x_added_x_copies 092fcca11bdb 936255a0384a : 4 revs, 0.000150 s, 0.000150 s, +0.000000 s, × 1.0000, 37 µs/rev mozilla-try x_revs_x00_added_x_copies b53d2fadbdb5 017afae788ec : 2 revs, 0.001158 s, 0.001166 s, +0.000008 s, × 1.0069, 583 µs/rev mozilla-try x_revs_x000_added_x000_copies 20408ad61ce5 6f0ee96e21ad : 1 revs, 0.027240 s, 0.027359 s, +0.000119 s, × 1.0044, 27359 µs/rev mozilla-try x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 6 revs, 0.062824 s, 0.061848 s, -0.000976 s, × 0.9845, 10308 µs/rev mozilla-try x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 1593 revs, 0.005463 s, 0.005110 s, -0.000353 s, × 0.9354, 3 µs/rev mozilla-try x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 41 revs, 0.004238 s, 0.004168 s, -0.000070 s, × 0.9835, 101 µs/rev mozilla-try x000_revs_x000_added_x000_copies 1346fd0130e4 4c65cbdabc1f : 6657 revs, 0.064113 s, 0.063414 s, -0.000699 s, × 0.9891, 9 µs/rev mozilla-try x0000_revs_x_added_0_copies 63519bfd42ee a36a2a865d92 : 40314 revs, 0.294063 s, 0.288301 s, -0.005762 s, × 0.9804, 7 µs/rev mozilla-try x0000_revs_x_added_x_copies 9fe69ff0762d bcabf2a78927 : 38690 revs, 0.281493 s, 0.275798 s, -0.005695 s, × 0.9798, 7 µs/rev mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 8598 revs, 0.076323 s, 0.074640 s, -0.001683 s, × 0.9779, 8 µs/rev mozilla-try x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 615 revs, 0.020390 s, 0.020327 s, -0.000063 s, × 0.9969, 33 µs/rev mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 97052 revs, 3.023879 s, 2.970385 s, -0.053494 s, × 0.9823, 30 µs/rev mozilla-try x0000_revs_x0000_added_x0000_copies e928c65095ed e951f4ad123a : 52031 revs, 0.735549 s, 0.719432 s, -0.016117 s, × 0.9781, 13 µs/rev mozilla-try x00000_revs_x_added_0_copies 6a320851d377 1ebb79acd503 : 363753 revs, 18.568900 s, 18.165143 s, -0.403757 s, × 0.9783, 49 µs/rev mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 34414 revs, 0.502584 s, 0.486769 s, -0.015815 s, × 0.9685, 14 µs/rev mozilla-try x00000_revs_x_added_x_copies 5173c4b6f97c 95d83ee7242d : 362229 revs, 18.356645 s, 17.913924 s, -0.442721 s, × 0.9759, 49 µs/rev mozilla-try x00000_revs_x000_added_x_copies 9126823d0e9c ca82787bb23c : 359344 revs, 18.250393 s, 17.660113 s, -0.590280 s, × 0.9677, 49 µs/rev mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 192665 revs, 2.792459 s, 2.709446 s, -0.083013 s, × 0.9703, 14 µs/rev mozilla-try x00000_revs_x00000_added_x0000_copies 1b661134e2ca 1ae03d022d6d : 228985 revs, 107.697264 s, 107.796891 s, +0.099627 s, × 1.0009, 470 µs/rev mozilla-try x00000_revs_x00000_added_x000_copies 9b2a99adc05e 8e29777b48e6 : 382065 revs, 63.961040 s, 63.575217 s, -0.385823 s, × 0.9940, 166 µs/rev Differential Revision: https://phab.mercurial-scm.org/D9423
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 20 Nov 2020 13:46:14 +0100
parents c407513a44a3
children dfddcbb0c244
line wrap: on
line source

# upgrade.py - functions for in place upgrade of Mercurial repository
#
# Copyright (c) 2016-present, Gregory Szorc
#
# 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 stat

from ..i18n import _
from ..pycompat import getattr
from .. import (
    changelog,
    error,
    filelog,
    manifest,
    metadata,
    pycompat,
    requirements,
    revlog,
    scmutil,
    util,
    vfs as vfsmod,
)


def _revlogfrompath(repo, path):
    """Obtain a revlog from a repo path.

    An instance of the appropriate class is returned.
    """
    if path == b'00changelog.i':
        return changelog.changelog(repo.svfs)
    elif path.endswith(b'00manifest.i'):
        mandir = path[: -len(b'00manifest.i')]
        return manifest.manifestrevlog(repo.svfs, tree=mandir)
    else:
        # reverse of "/".join(("data", path + ".i"))
        return filelog.filelog(repo.svfs, path[5:-2])


def _copyrevlog(tr, destrepo, oldrl, unencodedname):
    """copy all relevant files for `oldrl` into `destrepo` store

    Files are copied "as is" without any transformation. The copy is performed
    without extra checks. Callers are responsible for making sure the copied
    content is compatible with format of the destination repository.
    """
    oldrl = getattr(oldrl, '_revlog', oldrl)
    newrl = _revlogfrompath(destrepo, unencodedname)
    newrl = getattr(newrl, '_revlog', newrl)

    oldvfs = oldrl.opener
    newvfs = newrl.opener
    oldindex = oldvfs.join(oldrl.indexfile)
    newindex = newvfs.join(newrl.indexfile)
    olddata = oldvfs.join(oldrl.datafile)
    newdata = newvfs.join(newrl.datafile)

    with newvfs(newrl.indexfile, b'w'):
        pass  # create all the directories

    util.copyfile(oldindex, newindex)
    copydata = oldrl.opener.exists(oldrl.datafile)
    if copydata:
        util.copyfile(olddata, newdata)

    if not (
        unencodedname.endswith(b'00changelog.i')
        or unencodedname.endswith(b'00manifest.i')
    ):
        destrepo.svfs.fncache.add(unencodedname)
        if copydata:
            destrepo.svfs.fncache.add(unencodedname[:-2] + b'.d')


UPGRADE_CHANGELOG = b"changelog"
UPGRADE_MANIFEST = b"manifest"
UPGRADE_FILELOGS = b"all-filelogs"

UPGRADE_ALL_REVLOGS = frozenset(
    [UPGRADE_CHANGELOG, UPGRADE_MANIFEST, UPGRADE_FILELOGS]
)


def getsidedatacompanion(srcrepo, dstrepo):
    sidedatacompanion = None
    removedreqs = srcrepo.requirements - dstrepo.requirements
    addedreqs = dstrepo.requirements - srcrepo.requirements
    if requirements.SIDEDATA_REQUIREMENT in removedreqs:

        def sidedatacompanion(rl, rev):
            rl = getattr(rl, '_revlog', rl)
            if rl.flags(rev) & revlog.REVIDX_SIDEDATA:
                return True, (), {}, 0, 0
            return False, (), {}, 0, 0

    elif requirements.COPIESSDC_REQUIREMENT in addedreqs:
        sidedatacompanion = metadata.getsidedataadder(srcrepo, dstrepo)
    elif requirements.COPIESSDC_REQUIREMENT in removedreqs:
        sidedatacompanion = metadata.getsidedataremover(srcrepo, dstrepo)
    return sidedatacompanion


def matchrevlog(revlogfilter, entry):
    """check if a revlog is selected for cloning.

    In other words, are there any updates which need to be done on revlog
    or it can be blindly copied.

    The store entry is checked against the passed filter"""
    if entry.endswith(b'00changelog.i'):
        return UPGRADE_CHANGELOG in revlogfilter
    elif entry.endswith(b'00manifest.i'):
        return UPGRADE_MANIFEST in revlogfilter
    return UPGRADE_FILELOGS in revlogfilter


def _clonerevlogs(
    ui,
    srcrepo,
    dstrepo,
    tr,
    deltareuse,
    forcedeltabothparents,
    revlogs=UPGRADE_ALL_REVLOGS,
):
    """Copy revlogs between 2 repos."""
    revcount = 0
    srcsize = 0
    srcrawsize = 0
    dstsize = 0
    fcount = 0
    frevcount = 0
    fsrcsize = 0
    frawsize = 0
    fdstsize = 0
    mcount = 0
    mrevcount = 0
    msrcsize = 0
    mrawsize = 0
    mdstsize = 0
    crevcount = 0
    csrcsize = 0
    crawsize = 0
    cdstsize = 0

    alldatafiles = list(srcrepo.store.walk())

    # Perform a pass to collect metadata. This validates we can open all
    # source files and allows a unified progress bar to be displayed.
    for unencoded, encoded, size in alldatafiles:
        if unencoded.endswith(b'.d'):
            continue

        rl = _revlogfrompath(srcrepo, unencoded)

        info = rl.storageinfo(
            exclusivefiles=True,
            revisionscount=True,
            trackedsize=True,
            storedsize=True,
        )

        revcount += info[b'revisionscount'] or 0
        datasize = info[b'storedsize'] or 0
        rawsize = info[b'trackedsize'] or 0

        srcsize += datasize
        srcrawsize += rawsize

        # This is for the separate progress bars.
        if isinstance(rl, changelog.changelog):
            crevcount += len(rl)
            csrcsize += datasize
            crawsize += rawsize
        elif isinstance(rl, manifest.manifestrevlog):
            mcount += 1
            mrevcount += len(rl)
            msrcsize += datasize
            mrawsize += rawsize
        elif isinstance(rl, filelog.filelog):
            fcount += 1
            frevcount += len(rl)
            fsrcsize += datasize
            frawsize += rawsize
        else:
            error.ProgrammingError(b'unknown revlog type')

    if not revcount:
        return

    ui.status(
        _(
            b'migrating %d total revisions (%d in filelogs, %d in manifests, '
            b'%d in changelog)\n'
        )
        % (revcount, frevcount, mrevcount, crevcount)
    )
    ui.status(
        _(b'migrating %s in store; %s tracked data\n')
        % ((util.bytecount(srcsize), util.bytecount(srcrawsize)))
    )

    # Used to keep track of progress.
    progress = None

    def oncopiedrevision(rl, rev, node):
        progress.increment()

    sidedatacompanion = getsidedatacompanion(srcrepo, dstrepo)

    # Do the actual copying.
    # FUTURE this operation can be farmed off to worker processes.
    seen = set()
    for unencoded, encoded, size in alldatafiles:
        if unencoded.endswith(b'.d'):
            continue

        oldrl = _revlogfrompath(srcrepo, unencoded)

        if isinstance(oldrl, changelog.changelog) and b'c' not in seen:
            ui.status(
                _(
                    b'finished migrating %d manifest revisions across %d '
                    b'manifests; change in size: %s\n'
                )
                % (mrevcount, mcount, util.bytecount(mdstsize - msrcsize))
            )

            ui.status(
                _(
                    b'migrating changelog containing %d revisions '
                    b'(%s in store; %s tracked data)\n'
                )
                % (
                    crevcount,
                    util.bytecount(csrcsize),
                    util.bytecount(crawsize),
                )
            )
            seen.add(b'c')
            progress = srcrepo.ui.makeprogress(
                _(b'changelog revisions'), total=crevcount
            )
        elif isinstance(oldrl, manifest.manifestrevlog) and b'm' not in seen:
            ui.status(
                _(
                    b'finished migrating %d filelog revisions across %d '
                    b'filelogs; change in size: %s\n'
                )
                % (frevcount, fcount, util.bytecount(fdstsize - fsrcsize))
            )

            ui.status(
                _(
                    b'migrating %d manifests containing %d revisions '
                    b'(%s in store; %s tracked data)\n'
                )
                % (
                    mcount,
                    mrevcount,
                    util.bytecount(msrcsize),
                    util.bytecount(mrawsize),
                )
            )
            seen.add(b'm')
            if progress:
                progress.complete()
            progress = srcrepo.ui.makeprogress(
                _(b'manifest revisions'), total=mrevcount
            )
        elif b'f' not in seen:
            ui.status(
                _(
                    b'migrating %d filelogs containing %d revisions '
                    b'(%s in store; %s tracked data)\n'
                )
                % (
                    fcount,
                    frevcount,
                    util.bytecount(fsrcsize),
                    util.bytecount(frawsize),
                )
            )
            seen.add(b'f')
            if progress:
                progress.complete()
            progress = srcrepo.ui.makeprogress(
                _(b'file revisions'), total=frevcount
            )

        if matchrevlog(revlogs, unencoded):
            ui.note(
                _(b'cloning %d revisions from %s\n') % (len(oldrl), unencoded)
            )
            newrl = _revlogfrompath(dstrepo, unencoded)
            oldrl.clone(
                tr,
                newrl,
                addrevisioncb=oncopiedrevision,
                deltareuse=deltareuse,
                forcedeltabothparents=forcedeltabothparents,
                sidedatacompanion=sidedatacompanion,
            )
        else:
            msg = _(b'blindly copying %s containing %i revisions\n')
            ui.note(msg % (unencoded, len(oldrl)))
            _copyrevlog(tr, dstrepo, oldrl, unencoded)

            newrl = _revlogfrompath(dstrepo, unencoded)

        info = newrl.storageinfo(storedsize=True)
        datasize = info[b'storedsize'] or 0

        dstsize += datasize

        if isinstance(newrl, changelog.changelog):
            cdstsize += datasize
        elif isinstance(newrl, manifest.manifestrevlog):
            mdstsize += datasize
        else:
            fdstsize += datasize

    progress.complete()

    ui.status(
        _(
            b'finished migrating %d changelog revisions; change in size: '
            b'%s\n'
        )
        % (crevcount, util.bytecount(cdstsize - csrcsize))
    )

    ui.status(
        _(
            b'finished migrating %d total revisions; total change in store '
            b'size: %s\n'
        )
        % (revcount, util.bytecount(dstsize - srcsize))
    )


def _filterstorefile(srcrepo, dstrepo, requirements, path, mode, st):
    """Determine whether to copy a store file during upgrade.

    This function is called when migrating store files from ``srcrepo`` to
    ``dstrepo`` as part of upgrading a repository.

    Args:
      srcrepo: repo we are copying from
      dstrepo: repo we are copying to
      requirements: set of requirements for ``dstrepo``
      path: store file being examined
      mode: the ``ST_MODE`` file type of ``path``
      st: ``stat`` data structure for ``path``

    Function should return ``True`` if the file is to be copied.
    """
    # Skip revlogs.
    if path.endswith((b'.i', b'.d', b'.n', b'.nd')):
        return False
    # Skip transaction related files.
    if path.startswith(b'undo'):
        return False
    # Only copy regular files.
    if mode != stat.S_IFREG:
        return False
    # Skip other skipped files.
    if path in (b'lock', b'fncache'):
        return False

    return True


def _finishdatamigration(ui, srcrepo, dstrepo, requirements):
    """Hook point for extensions to perform additional actions during upgrade.

    This function is called after revlogs and store files have been copied but
    before the new store is swapped into the original location.
    """


def upgrade(ui, srcrepo, dstrepo, upgrade_op):
    """Do the low-level work of upgrading a repository.

    The upgrade is effectively performed as a copy between a source
    repository and a temporary destination repository.

    The source repository is unmodified for as long as possible so the
    upgrade can abort at any time without causing loss of service for
    readers and without corrupting the source repository.
    """
    assert srcrepo.currentwlock()
    assert dstrepo.currentwlock()

    ui.status(
        _(
            b'(it is safe to interrupt this process any time before '
            b'data migration completes)\n'
        )
    )

    if b're-delta-all' in upgrade_op.actions:
        deltareuse = revlog.revlog.DELTAREUSENEVER
    elif b're-delta-parent' in upgrade_op.actions:
        deltareuse = revlog.revlog.DELTAREUSESAMEREVS
    elif b're-delta-multibase' in upgrade_op.actions:
        deltareuse = revlog.revlog.DELTAREUSESAMEREVS
    elif b're-delta-fulladd' in upgrade_op.actions:
        deltareuse = revlog.revlog.DELTAREUSEFULLADD
    else:
        deltareuse = revlog.revlog.DELTAREUSEALWAYS

    with dstrepo.transaction(b'upgrade') as tr:
        _clonerevlogs(
            ui,
            srcrepo,
            dstrepo,
            tr,
            deltareuse,
            b're-delta-multibase' in upgrade_op.actions,
            revlogs=upgrade_op.revlogs_to_process,
        )

    # Now copy other files in the store directory.
    # The sorted() makes execution deterministic.
    for p, kind, st in sorted(srcrepo.store.vfs.readdir(b'', stat=True)):
        if not _filterstorefile(
            srcrepo, dstrepo, upgrade_op.requirements, p, kind, st
        ):
            continue

        srcrepo.ui.status(_(b'copying %s\n') % p)
        src = srcrepo.store.rawvfs.join(p)
        dst = dstrepo.store.rawvfs.join(p)
        util.copyfile(src, dst, copystat=True)

    _finishdatamigration(ui, srcrepo, dstrepo, requirements)

    ui.status(_(b'data fully migrated to temporary repository\n'))

    backuppath = pycompat.mkdtemp(prefix=b'upgradebackup.', dir=srcrepo.path)
    backupvfs = vfsmod.vfs(backuppath)

    # Make a backup of requires file first, as it is the first to be modified.
    util.copyfile(srcrepo.vfs.join(b'requires'), backupvfs.join(b'requires'))

    # We install an arbitrary requirement that clients must not support
    # as a mechanism to lock out new clients during the data swap. This is
    # better than allowing a client to continue while the repository is in
    # an inconsistent state.
    ui.status(
        _(
            b'marking source repository as being upgraded; clients will be '
            b'unable to read from repository\n'
        )
    )
    scmutil.writereporequirements(
        srcrepo, srcrepo.requirements | {b'upgradeinprogress'}
    )

    ui.status(_(b'starting in-place swap of repository data\n'))
    ui.status(_(b'replaced files will be backed up at %s\n') % backuppath)

    # Now swap in the new store directory. Doing it as a rename should make
    # the operation nearly instantaneous and atomic (at least in well-behaved
    # environments).
    ui.status(_(b'replacing store...\n'))
    tstart = util.timer()
    util.rename(srcrepo.spath, backupvfs.join(b'store'))
    util.rename(dstrepo.spath, srcrepo.spath)
    elapsed = util.timer() - tstart
    ui.status(
        _(
            b'store replacement complete; repository was inconsistent for '
            b'%0.1fs\n'
        )
        % elapsed
    )

    # We first write the requirements file. Any new requirements will lock
    # out legacy clients.
    ui.status(
        _(
            b'finalizing requirements file and making repository readable '
            b'again\n'
        )
    )
    scmutil.writereporequirements(srcrepo, upgrade_op.requirements)

    # The lock file from the old store won't be removed because nothing has a
    # reference to its new location. So clean it up manually. Alternatively, we
    # could update srcrepo.svfs and other variables to point to the new
    # location. This is simpler.
    backupvfs.unlink(b'store/lock')

    return backuppath