hgext/share.py
author Augie Fackler <augie@google.com>
Thu, 01 Oct 2015 15:35:10 -0400
changeset 26711 0ef0aec56090
parent 26587 56b2bcea2529
child 26933 a7eecd021782
permissions -rw-r--r--
changegroup: move manifest packing into a separate function A future change will introduce a new function on a cg3packer that can pack treemanifests as well as flatmanifests.
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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 mercurial.i18n import _
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from mercurial import cmdutil, commands, hg, util, extensions, bookmarks, error
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from mercurial.hg import repository, parseurl
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import errno
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cmdtable = {}
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command = cmdutil.command(cmdtable)
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# Note for extension authors: ONLY specify testedwith = 'internal' 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 = 'internal'
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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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    _('[-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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    """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, not noupdate, bookmarks)
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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.join('sharedpath')
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        util.rename(sharefile, sharefile + '.old')
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        repo.requirements.discard('sharedpath')
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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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    # update store, spath, svfs and sjoin of repo
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    repo.unfiltered().__init__(repo.baseui, repo.root)
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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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    opts['shareopts'] = dict(
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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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def extsetup(ui):
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    extensions.wrapfunction(bookmarks.bmstore, 'getbkfile', getbkfile)
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    extensions.wrapfunction(bookmarks.bmstore, 'recordchange', recordchange)
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    extensions.wrapfunction(bookmarks.bmstore, 'write', write)
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    extensions.wrapcommand(commands.table, 'clone', clone)
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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 'bookmarks' in shared
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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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    """
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    if repo.sharedpath == repo.path:
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        return None
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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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    return repository(repo.ui, srcurl)
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def getbkfile(orig, self, repo):
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    if _hassharedbookmarks(repo):
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        srcrepo = _getsrcrepo(repo)
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        if srcrepo is not None:
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            repo = srcrepo
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    return orig(self, repo)
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def recordchange(orig, self, tr):
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    # Continue with write to local bookmarks file as usual
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    orig(self, tr)
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    if _hassharedbookmarks(self._repo):
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        srcrepo = _getsrcrepo(self._repo)
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        if srcrepo is not None:
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            category = 'share-bookmarks'
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            tr.addpostclose(category, lambda tr: self._writerepo(srcrepo))
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def write(orig, self):
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    # First write local bookmarks file in case we ever unshare
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    orig(self)
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    if _hassharedbookmarks(self._repo):
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        srcrepo = _getsrcrepo(self._repo)
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        if srcrepo is not None:
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            self._writerepo(srcrepo)