author | Pierre-Yves David <pierre-yves.david@fb.com> |
Wed, 29 Apr 2015 10:36:43 -0700 | |
changeset 1290 | 8aa9a21156fe |
parent 1247 | f96dad835054 |
child 1292 | 62229e7451f7 |
permissions | -rw-r--r-- |
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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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The first feature provided by this extension is the ability to "inhibit" |
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obsolescence markers. Obsolete revision can be cheaply brought back to life |
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that way. However as the inhibitor are not fitting in an append only model, |
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this is incompatible with sharing mutable history. |
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The second feature is called direct access. It is the ability to refer and |
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access hidden sha in commands provided that you know their value. |
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For example hg log -r XXX where XXX is a commit has should work whether XXX is |
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hidden or not as we assume that the user knows what he is doing when referring |
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to XXX. |
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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 scmutil |
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from mercurial import repoview |
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from mercurial import revset |
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from mercurial import error |
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from mercurial import commands |
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from mercurial import bookmarks |
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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 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.sopener.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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# 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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repo.__class__ = obsinhibitedrepo |
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repo._explicitaccess = set() |
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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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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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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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def getdefaultopts(module, command): |
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""" Get default options of a command from a module """ |
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cmds = [v for k,v in module.cmdtable.items() if command in k] |
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assert len(cmds) == 1, "Ambiguous command" |
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# Options of the first command that matched |
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cmdopts = cmds[0][1] |
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optsdict = {} |
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for d in cmdopts: |
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optsdict[d[1]] = d[2] |
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return optsdict |
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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 = getdefaultopts(evolve, 'prune|obsolete') |
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optsdict['bookmark'] = bookmarks[0] |
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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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|
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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 if getphase(repo, getrev(n))) |
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|
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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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123 |
|
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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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newinhibit = repo.set('::%ln and obsolete()', nodes) |
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if newinhibit: |
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tr = repo.transaction('obsinhibit') |
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try: |
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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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tr.release() |
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def _deinhibitmarkers(repo, nodes): |
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"""lift obsolescence inhibition on a set of nodes |
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140 |
|
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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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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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|
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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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tr = repo.transaction('add-obsolescence-marker') |
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try: |
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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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tr.release() |
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|
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def transactioncallback(orig, repo, *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('(not hidden()) and obsolete()') |
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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, *args, **kwargs) |
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transaction.addpostclose('inhibitposttransaction', inhibitposttransaction) |
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return transaction |
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|
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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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186 |
|
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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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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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obsolete.cachefuncs['obsolete'] = _computeobsoleteset |
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# drop divergence computation since it is incompatible with "light revive" |
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195 |
obsolete.cachefuncs['divergent'] = lambda repo: set() |
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# drop bumped computation since it is incompatible with "light revive" |
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obsolete.cachefuncs['bumped'] = lambda repo: set() |
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# wrap create marker to make it able to lift the inhibition |
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extensions.wrapfunction(obsolete, 'createmarkers', _createmarkers) |
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extensions.wrapfunction(repoview, '_getdynamicblockers', _accessvisible) |
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extensions.wrapfunction(revset, 'posttreebuilthook', _posttreebuilthook) |
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# wrap update to make sure that no obsolete commit is visible after an |
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# update |
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extensions.wrapcommand(commands.table, 'update', _update) |
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# There are two ways to save bookmark changes during a transation, we |
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# wrap both to add inhibition markers. |
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extensions.wrapfunction(bookmarks.bmstore, 'recordchange', _bookmarkchanged) |
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extensions.wrapfunction(bookmarks.bmstore, 'write', _bookmarkchanged) |
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# Add bookmark -D option |
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entry = extensions.wrapcommand(commands.table, 'bookmark', _bookmark) |
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entry[1].append(('D','prune',None, |
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_('delete the bookmark and prune the commits underneath'))) |
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213 |
|
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214 |
|
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215 |
|
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216 |
def gethashsymbols(tree): |
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# Returns the list of symbols of the tree that look like hashes |
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# for example for the revset 3::abe3ff it will return ('abe3ff') |
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if not tree: |
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return [] |
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221 |
|
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222 |
if len(tree) == 2 and tree[0] == "symbol": |
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223 |
try: |
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224 |
int(tree[1]) |
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225 |
return [] |
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226 |
except ValueError as e: |
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return [tree[1]] |
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elif len(tree) == 3: |
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return gethashsymbols(tree[1]) + gethashsymbols(tree[2]) |
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else: |
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return [] |
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|
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def _posttreebuilthook(orig, tree, repo): |
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# This is use to enabled direct hash access |
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# We extract the symbols that look like hashes and add them to the |
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# explicitaccess set |
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orig(tree, repo) |
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if repo is not None and repo.filtername == 'visible': |
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prelength = len(repo._explicitaccess) |
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repo.symbols = gethashsymbols(tree) |
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cl = repo.unfiltered().changelog |
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for node in repo.symbols: |
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try: |
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node = cl._partialmatch(node) |
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except error.LookupError: |
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node = None |
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if node is not None: |
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rev = cl.rev(node) |
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if rev not in repo.changelog: |
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repo._explicitaccess.add(rev) |
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if prelength != len(repo._explicitaccess): |
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repo.invalidatevolatilesets() |
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|
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@command('debugobsinhibit', [], '') |
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def cmddebugobsinhibit(ui, repo, *revs): |
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"""inhibit obsolescence markers effect on a set of revs""" |
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nodes = (repo[r].node() for r in scmutil.revrange(repo, revs)) |
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_inhibitmarkers(repo, nodes) |
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|
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# ensure revision accessed by hash are visible |
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############################################### |
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|
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def _accessvisible(orig, repo): |
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"""ensure accessed revs stay visible""" |
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blockers = orig(repo) |
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blockers.update(getattr(repo, '_explicitaccess', ())) |
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return blockers |