hgext/inhibit.py
author Pierre-Yves David <pierre-yves.david@fb.com>
Wed, 12 Aug 2015 20:38:39 -0700
changeset 1491 8f469f81129c
parent 1488 3dec62fc266e
parent 1490 bc7eec65dfcf
child 1533 74cf5a69f201
permissions -rw-r--r--
merge with stable
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"""reduce the changesets evolution feature scope for early and noob friendly ui
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the full scale changeset evolution have some massive bleeding edge and it is
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very easy for people not very intimate with the concept to end up in intricate
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situation. in order to get some of the benefit sooner, this extension is
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disabling some of the less polished aspect of evolution. it should gradually
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get thinner and thinner as changeset evolution will get more polished. this
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extension is only recommended for large scale organisations. individual user
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should probably stick on using evolution in its current state, understand its
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concept and provide feedback
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This extension provides the ability to "inhibit" obsolescence markers. obsolete 
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revision can be cheaply brought back to life that way. 
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However as the inhibitor are not fitting in an append only model, this is 
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incompatible with sharing mutable history.
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"""
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from mercurial import localrepo
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from mercurial import obsolete
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from mercurial import extensions
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from mercurial import cmdutil
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from mercurial import error
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from mercurial import scmutil
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from mercurial import commands
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from mercurial import lock as lockmod
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from mercurial import bookmarks
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from mercurial import util
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from mercurial.i18n import _
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cmdtable = {}
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command = cmdutil.command(cmdtable)
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def _inhibitenabled(repo):
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    return util.safehasattr(repo, '_obsinhibit')
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def reposetup(ui, repo):
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    class obsinhibitedrepo(repo.__class__):
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        @localrepo.storecache('obsinhibit')
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        def _obsinhibit(self):
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            # XXX we should make sure it is invalidated by transaction failure
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            obsinhibit = set()
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            raw = self.svfs.tryread('obsinhibit')
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            for i in xrange(0, len(raw), 20):
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                obsinhibit.add(raw[i:i+20])
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            return obsinhibit
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        def commit(self, *args, **kwargs):
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            newnode = super(obsinhibitedrepo, self).commit(*args, **kwargs)
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            if newnode is not None:
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                _inhibitmarkers(repo, [newnode])
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            return newnode
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    repo.__class__ = obsinhibitedrepo
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def _update(orig, ui, repo, *args, **kwargs):
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    """
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    When moving to a commit we want to inhibit any obsolete commit affecting
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    the changeset we are updating to. In other words we don't want any visible
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    commit to be obsolete.
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    """
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    wlock = None
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    try:
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        # Evolve is running a hook on lock release to display a warning message 
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        # if the workind dir's parent is obsolete.
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        # We take the lock here to make sure that we inhibit the parent before
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        # that hook get a chance to run.
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        wlock = repo.wlock()
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        res = orig(ui, repo, *args, **kwargs)
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        newhead = repo['.'].node()
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        _inhibitmarkers(repo, [newhead])
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        return res
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    finally:
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        lockmod.release(wlock)
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def _bookmarkchanged(orig, bkmstoreinst, *args, **kwargs):
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    """ Add inhibition markers to every obsolete bookmarks """
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    repo = bkmstoreinst._repo
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    bkmstorenodes = [repo[v].node() for v in bkmstoreinst.values()]
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    _inhibitmarkers(repo, bkmstorenodes)
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    return orig(bkmstoreinst, *args, **kwargs)
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def _bookmark(orig, ui, repo, *bookmarks, **opts):
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    """ Add a -D option to the bookmark command, map it to prune -B """
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    haspruneopt = opts.get('prune', False)
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    if not haspruneopt:
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        return orig(ui, repo, *bookmarks, **opts)
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    # Call prune -B
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    evolve = extensions.find('evolve')
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    optsdict = {
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        'new': [],
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        'succ': [],
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        'rev': [],
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        'bookmark': bookmarks[0],
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        'keep': None,
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        'biject': False,
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    }
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    evolve.cmdprune(ui, repo, **optsdict)
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# obsolescence inhibitor
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########################
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def _schedulewrite(tr, obsinhibit):
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    """Make sure on disk content will be updated on transaction commit"""
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    def writer(fp):
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        """Serialize the inhibited list to disk.
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        """
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        raw = ''.join(obsinhibit)
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        fp.write(raw)
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    tr.addfilegenerator('obsinhibit', ('obsinhibit',), writer)
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    tr.hookargs['obs_inbihited'] = '1'
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def _filterpublic(repo, nodes):
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    """filter out inhibitor on public changeset
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    Public changesets are already immune to obsolescence"""
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    getrev = repo.changelog.nodemap.get
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    getphase = repo._phasecache.phase
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    return (n for n in repo._obsinhibit
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            if getrev(n) is not None and getphase(repo, getrev(n)))
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def _inhibitmarkers(repo, nodes):
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    """add marker inhibitor for all obsolete revision under <nodes>
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    Content of <nodes> and all mutable ancestors are considered. Marker for
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    obsolete revision only are created.
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    """
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    if not _inhibitenabled(repo):
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        return
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    newinhibit = repo.set('::%ln and obsolete()', nodes)
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    if newinhibit:
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        lock = tr = None
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        try:
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            lock = repo.lock()
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            tr = repo.transaction('obsinhibit')
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            repo._obsinhibit.update(c.node() for c in newinhibit)
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            _schedulewrite(tr, _filterpublic(repo, repo._obsinhibit))
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            repo.invalidatevolatilesets()
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            tr.close()
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        finally:
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            lockmod.release(tr, lock)
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def _deinhibitmarkers(repo, nodes):
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    """lift obsolescence inhibition on a set of nodes
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    This will be triggered when inhibited nodes received new obsolescence
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    markers. Otherwise the new obsolescence markers would also be inhibited.
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    """
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    if not _inhibitenabled(repo):
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        return
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    deinhibited = repo._obsinhibit & set(nodes)
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    if deinhibited:
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        tr = repo.transaction('obsinhibit')
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        try:
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            repo._obsinhibit -= deinhibited
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            _schedulewrite(tr, _filterpublic(repo, repo._obsinhibit))
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            repo.invalidatevolatilesets()
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            tr.close()
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        finally:
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            tr.release()
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def _createmarkers(orig, repo, relations, flag=0, date=None, metadata=None):
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    """wrap markers create to make sure we de-inhibit target nodes"""
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    # wrapping transactio to unify the one in each function
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    lock = tr = None
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    try:
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        lock = repo.lock()
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        tr = repo.transaction('add-obsolescence-marker')
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        orig(repo, relations, flag, date, metadata)
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        precs = (r[0].node() for r in relations)
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        _deinhibitmarkers(repo, precs)
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        tr.close()
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    finally:
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        lockmod.release(tr, lock)
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def transactioncallback(orig, repo, desc, *args, **kwargs):
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    """ Wrap localrepo.transaction to inhibit new obsolete changes """
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    def inhibitposttransaction(transaction):
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        # At the end of the transaction we catch all the new visible and
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        # obsolete commit to inhibit them
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        visibleobsolete = repo.revs('obsolete() - hidden()')
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        ignoreset = set(getattr(repo, '_rebaseset', []))
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        visibleobsolete = list(r for r in visibleobsolete if r not in ignoreset)
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        if visibleobsolete:
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            _inhibitmarkers(repo, [repo[r].node() for r in visibleobsolete])
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    transaction = orig(repo, desc, *args, **kwargs)
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    if desc != 'strip' and _inhibitenabled(repo):
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        transaction.addpostclose('inhibitposttransaction', inhibitposttransaction)
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    return transaction
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def extsetup(ui):
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    # lets wrap the computation of the obsolete set
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    # We apply inhibition there
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    obsfunc = obsolete.cachefuncs['obsolete']
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    def _computeobsoleteset(repo):
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        """remove any inhibited nodes from the obsolete set
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        This will trickle down to other part of mercurial (hidden, log, etc)"""
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        obs = obsfunc(repo)
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        if _inhibitenabled(repo):
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            getrev = repo.changelog.nodemap.get
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            for n in repo._obsinhibit:
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                obs.discard(getrev(n))
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        return obs
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    try:
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   209
        extensions.find('directaccess')
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   210
    except KeyError:
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        errormsg = _('cannot use inhibit without the direct access extension\n')
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        hint = _("(please enable it or inhibit won\'t work)\n")
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        ui.warn(errormsg)
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        ui.warn(hint)
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        return
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    # Wrapping this to inhibit obsolete revs resulting from a transaction
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    extensions.wrapfunction(localrepo.localrepository,
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                            'transaction', transactioncallback)
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   220
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    obsolete.cachefuncs['obsolete'] = _computeobsoleteset
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    # wrap create marker to make it able to lift the inhibition
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   223
    extensions.wrapfunction(obsolete, 'createmarkers', _createmarkers)
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   224
    # drop divergence computation since it is incompatible with "light revive"
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   225
    obsolete.cachefuncs['divergent'] = lambda repo: set()
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   226
    # drop bumped computation since it is incompatible with "light revive"
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   227
    obsolete.cachefuncs['bumped'] = lambda repo: set()
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   228
    # wrap update to make sure that no obsolete commit is visible after an
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   229
    # update
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    extensions.wrapcommand(commands.table, 'update', _update)
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   231
    # There are two ways to save bookmark changes during a transation, we
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   232
    # wrap both to add inhibition markers.
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   233
    extensions.wrapfunction(bookmarks.bmstore, 'recordchange', _bookmarkchanged)
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   234
    extensions.wrapfunction(bookmarks.bmstore, 'write', _bookmarkchanged)
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   235
    # Add bookmark -D option
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   236
    entry = extensions.wrapcommand(commands.table, 'bookmark', _bookmark)
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   237
    entry[1].append(('D','prune',None,
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                    _('delete the bookmark and prune the commits underneath')))
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   239
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@command('debugobsinhibit', [], '')
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   241
def cmddebugobsinhibit(ui, repo, *revs):
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   242
    """inhibit obsolescence markers effect on a set of revs"""
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   243
    nodes = (repo[r].node() for r in scmutil.revrange(repo, revs))
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   244
    _inhibitmarkers(repo, nodes)