# 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 _perform_clone(

    ui,

    dstrepo,

    tr,

    old_revlog,

    unencoded,

    deltareuse,

    forcedeltabothparents,

    revlogs,

    sidedatacompanion,

    oncopiedrevision,

):

    """ returns the new revlog object created"""

    newrl = None

    if matchrevlog(revlogs, unencoded):

        ui.note(

            _(b'cloning %d revisions from %s\n') % (len(old_revlog), unencoded)

        )

        newrl = _revlogfrompath(dstrepo, unencoded)

        old_revlog.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(old_revlog)))

        _copyrevlog(tr, dstrepo, old_revlog, unencoded)

        newrl = _revlogfrompath(dstrepo, unencoded)

    return newrl

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)

        newrl = _perform_clone(

            ui,

            dstrepo,

            tr,

            oldrl,

            unencoded,

            deltareuse,

            forcedeltabothparents,

            revlogs,

            sidedatacompanion,

            oncopiedrevision,

        )

        info = newrl.storageinfo(storedsize=True)

        datasize = info[b'storedsize'] or 0

        dstsize += 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):