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These config items control share behavior that is implemented in core. Since the functionality is implemented in core, extensions may leverage it. Mozilla has one such extension. And, it needs to access share.pool. Before this patch, a devel warning regarding accessing an unregistered config option would be issued unless the share extension were loaded. Moving the registration of the config options to core fixes this.
202 lines
6.8 KiB
Python
202 lines
6.8 KiB
Python
# 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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hg.share(ui, source, dest=dest, update=not noupdate,
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bookmarks=bookmarks, relative=relative)
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return 0
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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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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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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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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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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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if util.safehasattr(repo, 'srcrepo') and repo.srcrepo:
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return repo.srcrepo
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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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repo.srcrepo = srcrepo
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return srcrepo
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def getbkfile(orig, 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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# 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(repo.root, repo.vfs,
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'bookmarks')
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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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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 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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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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orig(self, srcrepo)
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