hgext/share.py
author Jun Wu <quark@fb.com>
Fri, 07 Jul 2017 18:51:46 -0700
changeset 33332 3b7cb3d17137
parent 33021 24c0a9a7fa86
child 33515 3325c7dcabaa
permissions -rw-r--r--
rebase: use scmutil.cleanupnodes (issue5606) (BC) This patch migrates rebase to use scmutil.cleanupnodes API. It simplifies the code and makes rebase code reusable inside a transaction. This is a BC because the backup file is no longer strip-backup/*-backup.hg, but strip-backup/*-rebase.hg. The latter looks more reasonable since the directory name is "strip-backup" so there is no need to repeat "backup". I think the backup file name change is probably fine as a BC, since we have changed it before (aa4a1672583e) and didn't get complains. The end result of this series will be a much more consistent and unified backup names: command | old backup file suffix | new backup file suffix ------------------------------------------------------------------- amend | amend-backup.hg | amend.hg histedit | backup.hg (could be 2 files) | histedit.hg (single file) rebase | backup.hg | rebase.hg strip | backup.hg | backup.hg (note: backup files are under .hg/strip-backup) It also fixes issue5606 as a side effect because the new "delayedstrip" code path will carefully examine nodes (safestriproots) to make sure orphaned changesets won't get stripped by accident. Some warning messages are changed to the new "warning: orphaned descendants detected, not stripping HASHES", which provides more information about exactly what changesets are left behind. Another minor behavior change is when there is an obsoleted changeset with a successor in the destination branch, bookmarks pointing to that obsoleted changeset will not be moved. I have commented in test-rebase-obsolete.t explaining why that is more desirable.
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# Copyright 2006, 2007 Matt Mackall <mpm@selenic.com>
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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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'''share a common history between several working directories
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Automatic Pooled Storage for Clones
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-----------------------------------
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When this extension is active, :hg:`clone` can be configured to
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automatically share/pool storage across multiple clones. This
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mode effectively converts :hg:`clone` to :hg:`clone` + :hg:`share`.
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The benefit of using this mode is the automatic management of
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store paths and intelligent pooling of related repositories.
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The following ``share.`` config options influence this feature:
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``share.pool``
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    Filesystem path where shared repository data will be stored. When
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    defined, :hg:`clone` will automatically use shared repository
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    storage instead of creating a store inside each clone.
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``share.poolnaming``
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    How directory names in ``share.pool`` are constructed.
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    "identity" means the name is derived from the first changeset in the
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    repository. In this mode, different remotes share storage if their
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    root/initial changeset is identical. In this mode, the local shared
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    repository is an aggregate of all encountered remote repositories.
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    "remote" means the name is derived from the source repository's
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    path or URL. In this mode, storage is only shared if the path or URL
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    requested in the :hg:`clone` command matches exactly to a repository
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    that was cloned before.
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    The default naming mode is "identity."
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'''
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from __future__ import absolute_import
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import errno
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from mercurial.i18n import _
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from mercurial import (
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    bookmarks,
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    commands,
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    error,
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    extensions,
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    hg,
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    registrar,
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    txnutil,
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    util,
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)
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repository = hg.repository
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parseurl = hg.parseurl
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cmdtable = {}
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command = registrar.command(cmdtable)
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# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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# be specifying the version(s) of Mercurial they are tested with, or
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# leave the attribute unspecified.
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testedwith = 'ships-with-hg-core'
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@command('share',
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    [('U', 'noupdate', None, _('do not create a working directory')),
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     ('B', 'bookmarks', None, _('also share bookmarks')),
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     ('', 'relative', None, _('point to source using a relative path '
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                              '(EXPERIMENTAL)')),
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    ],
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    _('[-U] [-B] SOURCE [DEST]'),
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    norepo=True)
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def share(ui, source, dest=None, noupdate=False, bookmarks=False,
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          relative=False):
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    """create a new shared repository
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    Initialize a new repository and working directory that shares its
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    history (and optionally bookmarks) with another repository.
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    .. note::
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       using rollback or extensions that destroy/modify history (mq,
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       rebase, etc.) can cause considerable confusion with shared
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       clones. In particular, if two shared clones are both updated to
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       the same changeset, and one of them destroys that changeset
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       with rollback, the other clone will suddenly stop working: all
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       operations will fail with "abort: working directory has unknown
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       parent". The only known workaround is to use debugsetparents on
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       the broken clone to reset it to a changeset that still exists.
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    """
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    return hg.share(ui, source, dest=dest, update=not noupdate,
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                    bookmarks=bookmarks, relative=relative)
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@command('unshare', [], '')
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def unshare(ui, repo):
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    """convert a shared repository to a normal one
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    Copy the store data to the repo and remove the sharedpath data.
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    """
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    if not repo.shared():
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        raise error.Abort(_("this is not a shared repo"))
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    destlock = lock = None
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    lock = repo.lock()
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    try:
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        # we use locks here because if we race with commit, we
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        # can end up with extra data in the cloned revlogs that's
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        # not pointed to by changesets, thus causing verify to
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        # fail
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        destlock = hg.copystore(ui, repo, repo.path)
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        sharefile = repo.vfs.join('sharedpath')
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        util.rename(sharefile, sharefile + '.old')
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        repo.requirements.discard('shared')
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        repo.requirements.discard('relshared')
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        repo._writerequirements()
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    finally:
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        destlock and destlock.release()
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        lock and lock.release()
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   125
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    # update store, spath, svfs and sjoin of repo
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    repo.unfiltered().__init__(repo.baseui, repo.root)
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   128
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# Wrap clone command to pass auto share options.
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def clone(orig, ui, source, *args, **opts):
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    pool = ui.config('share', 'pool', None)
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    if pool:
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        pool = util.expandpath(pool)
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   134
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    opts[r'shareopts'] = {
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        'pool': pool,
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        'mode': ui.config('share', 'poolnaming', 'identity'),
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    }
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    return orig(ui, source, *args, **opts)
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   141
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def extsetup(ui):
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    extensions.wrapfunction(bookmarks, '_getbkfile', getbkfile)
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    extensions.wrapfunction(bookmarks.bmstore, 'recordchange', recordchange)
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    extensions.wrapfunction(bookmarks.bmstore, '_writerepo', writerepo)
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    extensions.wrapcommand(commands.table, 'clone', clone)
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   147
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def _hassharedbookmarks(repo):
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    """Returns whether this repo has shared bookmarks"""
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    try:
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        shared = repo.vfs.read('shared').splitlines()
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    except IOError as inst:
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        if inst.errno != errno.ENOENT:
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            raise
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        return False
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    return hg.sharedbookmarks in shared
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   157
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def _getsrcrepo(repo):
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    """
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    Returns the source repository object for a given shared repository.
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    If repo is not a shared repository, return None.
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   162
    """
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    if repo.sharedpath == repo.path:
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        return None
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   165
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    if util.safehasattr(repo, 'srcrepo') and repo.srcrepo:
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   167
        return repo.srcrepo
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   168
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    # the sharedpath always ends in the .hg; we want the path to the repo
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    source = repo.vfs.split(repo.sharedpath)[0]
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    srcurl, branches = parseurl(source)
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    srcrepo = repository(repo.ui, srcurl)
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   173
    repo.srcrepo = srcrepo
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   174
    return srcrepo
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   175
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   176
def getbkfile(orig, repo):
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   177
    if _hassharedbookmarks(repo):
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        srcrepo = _getsrcrepo(repo)
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   179
        if srcrepo is not None:
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   180
            # just orig(srcrepo) doesn't work as expected, because
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   181
            # HG_PENDING refers repo.root.
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   182
            try:
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   183
                fp, pending = txnutil.trypending(repo.root, repo.vfs,
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   184
                                                 'bookmarks')
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   185
                if pending:
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   186
                    # only in this case, bookmark information in repo
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   187
                    # is up-to-date.
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   188
                    return fp
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   189
                fp.close()
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   190
            except IOError as inst:
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parents: 29841
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   191
                if inst.errno != errno.ENOENT:
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   192
                    raise
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   193
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   194
            # otherwise, we should read bookmarks from srcrepo,
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   195
            # because .hg/bookmarks in srcrepo might be already
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   196
            # changed via another sharing repo
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   197
            repo = srcrepo
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   198
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   199
            # TODO: Pending changes in repo are still invisible in
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   200
            # srcrepo, because bookmarks.pending is written only into repo.
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   201
            # See also https://www.mercurial-scm.org/wiki/SharedRepository
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   202
    return orig(repo)
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   203
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   204
def recordchange(orig, self, tr):
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   205
    # Continue with write to local bookmarks file as usual
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   206
    orig(self, tr)
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   207
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   208
    if _hassharedbookmarks(self._repo):
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   209
        srcrepo = _getsrcrepo(self._repo)
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   210
        if srcrepo is not None:
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   211
            category = 'share-bookmarks'
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   212
            tr.addpostclose(category, lambda tr: self._writerepo(srcrepo))
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   213
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   214
def writerepo(orig, self, repo):
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   215
    # First write local bookmarks file in case we ever unshare
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   216
    orig(self, repo)
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   217
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   218
    if _hassharedbookmarks(self._repo):
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   219
        srcrepo = _getsrcrepo(self._repo)
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   220
        if srcrepo is not None:
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diff changeset
   221
            orig(self, srcrepo)