hgext/share.py
author Augie Fackler <augie@google.com>
Sun, 06 Oct 2019 09:45:02 -0400
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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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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(
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    'share',
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    [
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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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        (
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            '',
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            'relative',
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            None,
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            _('point to source using a relative path ' '(EXPERIMENTAL)'),
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        ),
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    ],
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    _('[-U] [-B] SOURCE [DEST]'),
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    helpcategory=command.CATEGORY_REPO_CREATION,
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    norepo=True,
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)
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def share(
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    ui, source, dest=None, noupdate=False, bookmarks=False, relative=False
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):
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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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    hg.share(
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        ui,
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        source,
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        dest=dest,
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        update=not noupdate,
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        bookmarks=bookmarks,
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        relative=relative,
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    )
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    return 0
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@command('unshare', [], '', helpcategory=command.CATEGORY_MAINTENANCE)
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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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    hg.unshare(ui, repo)
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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')
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    if pool:
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        pool = util.expandpath(pool)
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    opts[r'shareopts'] = {
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        'pool': pool,
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        'mode': ui.config('share', 'poolnaming'),
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    }
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    return orig(ui, source, *args, **opts)
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   136
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   137
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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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   143
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   144
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def _hassharedbookmarks(repo):
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    """Returns whether this repo has shared bookmarks"""
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    if bookmarks.bookmarksinstore(repo):
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        # Kind of a lie, but it means that we skip our custom reads and writes
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        # from/to the source repo.
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        return False
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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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   159
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def getbkfile(orig, repo):
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    if _hassharedbookmarks(repo):
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        srcrepo = hg.sharedreposource(repo)
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        if srcrepo is not None:
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            # just orig(srcrepo) doesn't work as expected, because
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            # HG_PENDING refers repo.root.
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            try:
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                fp, pending = txnutil.trypending(
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                    repo.root, repo.vfs, 'bookmarks'
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                )
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                if pending:
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                    # only in this case, bookmark information in repo
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                    # is up-to-date.
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                    return fp
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                fp.close()
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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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            # otherwise, we should read bookmarks from srcrepo,
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            # because .hg/bookmarks in srcrepo might be already
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            # changed via another sharing repo
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            repo = srcrepo
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            # TODO: Pending changes in repo are still invisible in
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            # srcrepo, because bookmarks.pending is written only into repo.
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            # See also https://www.mercurial-scm.org/wiki/SharedRepository
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    return orig(repo)
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   189
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def recordchange(orig, self, tr):
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   191
    # Continue with write to local bookmarks file as usual
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    orig(self, tr)
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   193
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    if _hassharedbookmarks(self._repo):
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   195
        srcrepo = hg.sharedreposource(self._repo)
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   196
        if srcrepo is not None:
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   197
            category = 'share-bookmarks'
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            tr.addpostclose(category, lambda tr: self._writerepo(srcrepo))
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   199
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   201
def writerepo(orig, self, repo):
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    # First write local bookmarks file in case we ever unshare
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    orig(self, repo)
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   204
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   205
    if _hassharedbookmarks(self._repo):
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        srcrepo = hg.sharedreposource(self._repo)
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        if srcrepo is not None:
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   208
            orig(self, srcrepo)