Mercurial > hg
view hgext/share.py @ 31994:b36318e6d2ef
track-tags: introduce first bits of tags tracking during transaction
This changeset introduces detection of tags changes during transaction. When
this happens a 'tag_moved=1' argument is set for hooks, similar to what we do
for bookmarks and phases.
This code is disabled by default as there are still various performance
concerns. Some require a smarter use of our existing tag caches and some other
require rework around the transaction logic to skip execution when unneeded.
These performance improvements have been delayed, I would like to be able to
experiment and stabilize the feature behavior first.
Later changesets will push the concept further and provide a way for hooks to
know what are the actual changes introduced by the transaction. Similar work
is needed for the other families of changes (bookmark, phase, obsolescence,
etc). Upgrade of the transaction logic will likely be performed at the same
time.
The current code can report some false positive when .hgtags file changes but
resulting tags are unchanged. This will be fixed in the next changeset.
For testing, we simply globally enable a hook in the tag test as all the
possible tag update cases should exist there. A couple of them show the false
positive mentioned above.
See in code documentation for more details.
author | Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
---|---|
date | Tue, 28 Mar 2017 06:38:09 +0200 |
parents | 553680d1b654 |
children | 46ba2cdda476 |
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# Copyright 2006, 2007 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. '''share a common history between several working directories Automatic Pooled Storage for Clones ----------------------------------- When this extension is active, :hg:`clone` can be configured to automatically share/pool storage across multiple clones. This mode effectively converts :hg:`clone` to :hg:`clone` + :hg:`share`. The benefit of using this mode is the automatic management of store paths and intelligent pooling of related repositories. The following ``share.`` config options influence this feature: ``share.pool`` Filesystem path where shared repository data will be stored. When defined, :hg:`clone` will automatically use shared repository storage instead of creating a store inside each clone. ``share.poolnaming`` How directory names in ``share.pool`` are constructed. "identity" means the name is derived from the first changeset in the repository. In this mode, different remotes share storage if their root/initial changeset is identical. In this mode, the local shared repository is an aggregate of all encountered remote repositories. "remote" means the name is derived from the source repository's path or URL. In this mode, storage is only shared if the path or URL requested in the :hg:`clone` command matches exactly to a repository that was cloned before. The default naming mode is "identity." ''' from __future__ import absolute_import import errno from mercurial.i18n import _ from mercurial import ( bookmarks, cmdutil, commands, error, extensions, hg, txnutil, util, ) repository = hg.repository parseurl = hg.parseurl cmdtable = {} command = cmdutil.command(cmdtable) # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should # be specifying the version(s) of Mercurial they are tested with, or # leave the attribute unspecified. testedwith = 'ships-with-hg-core' @command('share', [('U', 'noupdate', None, _('do not create a working directory')), ('B', 'bookmarks', None, _('also share bookmarks')), ('', 'relative', None, _('point to source using a relative path ' '(EXPERIMENTAL)')), ], _('[-U] [-B] SOURCE [DEST]'), norepo=True) def share(ui, source, dest=None, noupdate=False, bookmarks=False, relative=False): """create a new shared repository Initialize a new repository and working directory that shares its history (and optionally bookmarks) with another repository. .. note:: using rollback or extensions that destroy/modify history (mq, rebase, etc.) can cause considerable confusion with shared clones. In particular, if two shared clones are both updated to the same changeset, and one of them destroys that changeset with rollback, the other clone will suddenly stop working: all operations will fail with "abort: working directory has unknown parent". The only known workaround is to use debugsetparents on the broken clone to reset it to a changeset that still exists. """ return hg.share(ui, source, dest=dest, update=not noupdate, bookmarks=bookmarks, relative=relative) @command('unshare', [], '') def unshare(ui, repo): """convert a shared repository to a normal one Copy the store data to the repo and remove the sharedpath data. """ if not repo.shared(): raise error.Abort(_("this is not a shared repo")) destlock = lock = None lock = repo.lock() try: # we use locks here because if we race with commit, we # can end up with extra data in the cloned revlogs that's # not pointed to by changesets, thus causing verify to # fail destlock = hg.copystore(ui, repo, repo.path) sharefile = repo.vfs.join('sharedpath') util.rename(sharefile, sharefile + '.old') repo.requirements.discard('shared') repo.requirements.discard('relshared') repo._writerequirements() finally: destlock and destlock.release() lock and lock.release() # update store, spath, svfs and sjoin of repo repo.unfiltered().__init__(repo.baseui, repo.root) # Wrap clone command to pass auto share options. def clone(orig, ui, source, *args, **opts): pool = ui.config('share', 'pool', None) if pool: pool = util.expandpath(pool) opts['shareopts'] = dict( pool=pool, mode=ui.config('share', 'poolnaming', 'identity'), ) return orig(ui, source, *args, **opts) def extsetup(ui): extensions.wrapfunction(bookmarks, '_getbkfile', getbkfile) extensions.wrapfunction(bookmarks.bmstore, 'recordchange', recordchange) extensions.wrapfunction(bookmarks.bmstore, '_writerepo', writerepo) extensions.wrapcommand(commands.table, 'clone', clone) def _hassharedbookmarks(repo): """Returns whether this repo has shared bookmarks""" try: shared = repo.vfs.read('shared').splitlines() except IOError as inst: if inst.errno != errno.ENOENT: raise return False return hg.sharedbookmarks in shared def _getsrcrepo(repo): """ Returns the source repository object for a given shared repository. If repo is not a shared repository, return None. """ if repo.sharedpath == repo.path: return None if util.safehasattr(repo, 'srcrepo') and repo.srcrepo: return repo.srcrepo # the sharedpath always ends in the .hg; we want the path to the repo source = repo.vfs.split(repo.sharedpath)[0] srcurl, branches = parseurl(source) srcrepo = repository(repo.ui, srcurl) repo.srcrepo = srcrepo return srcrepo def getbkfile(orig, repo): if _hassharedbookmarks(repo): srcrepo = _getsrcrepo(repo) if srcrepo is not None: # just orig(srcrepo) doesn't work as expected, because # HG_PENDING refers repo.root. try: fp, pending = txnutil.trypending(repo.root, repo.vfs, 'bookmarks') if pending: # only in this case, bookmark information in repo # is up-to-date. return fp fp.close() except IOError as inst: if inst.errno != errno.ENOENT: raise # otherwise, we should read bookmarks from srcrepo, # because .hg/bookmarks in srcrepo might be already # changed via another sharing repo repo = srcrepo # TODO: Pending changes in repo are still invisible in # srcrepo, because bookmarks.pending is written only into repo. # See also https://www.mercurial-scm.org/wiki/SharedRepository return orig(repo) def recordchange(orig, self, tr): # Continue with write to local bookmarks file as usual orig(self, tr) if _hassharedbookmarks(self._repo): srcrepo = _getsrcrepo(self._repo) if srcrepo is not None: category = 'share-bookmarks' tr.addpostclose(category, lambda tr: self._writerepo(srcrepo)) def writerepo(orig, self, repo): # First write local bookmarks file in case we ever unshare orig(self, repo) if _hassharedbookmarks(self._repo): srcrepo = _getsrcrepo(self._repo) if srcrepo is not None: orig(self, srcrepo)