author | Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
Wed, 14 Sep 2011 17:51:25 +0200 | |
changeset 77 | 45afdbf062f4 |
parent 75 | d7b11772f0b5 |
child 79 | 9906560f585e |
permissions | -rw-r--r-- |
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# obsolete.py - introduce the obsolete concept in mercurial. |
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# |
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# Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
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# Logilab SA <contact@logilab.fr> |
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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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"""Introduce the Obsolete concept to mercurial |
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General concept |
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=============== |
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This extension introduces the *obsolete* concept. It adds a new *obsolete* |
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relation between two changesets. A relation ``<changeset B> obsolete <changeset |
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A>`` is set to denote that ``<changeset B>`` is new version of ``<changeset |
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A>``. |
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The *obsolete* relation act as a **perpendicular history** to the standard |
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changeset history. Standard changeset history versions files. The *obsolete* |
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relation versions changesets. |
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:obsolete: a changeset that have been replace by another one. |
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:out of sync: a non-obsolet changeset based on another one. |
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:suspended: an obsolete changeset with out of sync descendant. |
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Usage and Feature |
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================= |
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Display and Exchange |
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.................... |
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obsolete changesets are hidden. (except if they have non obsolete changeset) |
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obsolete changesets are currently not exchange. This will probably change later |
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but it was the simpler solution for now. |
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New commands |
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............ |
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a ``debugobsolete`` command has been added. |
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It add an obsolete relation between too relation. |
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Context object |
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.............. |
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Context gain a ``obsolete`` method that return True if a changeset is obsolete |
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False otherwise. |
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revset |
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...... |
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Add an ``obsolete()`` entry. |
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repo extension |
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.............. |
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To Do |
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----- |
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* refuse to obsolete published changesets |
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* handle split |
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* handle conflict |
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* handle out of sync |
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""" |
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import os |
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try: |
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from cStringIO import StringIO |
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except ImportError: |
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from StringIO import StringIO |
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from mercurial.i18n import _ |
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from mercurial import util |
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from mercurial import context |
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from mercurial import revset |
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from mercurial import scmutil |
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from mercurial import extensions |
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from mercurial import pushkey |
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from mercurial import discovery |
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from mercurial import error |
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from mercurial.node import hex, bin, short |
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from mercurial.lock import release |
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### Patch changectx |
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############################# |
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def obsolete(ctx): |
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"""is the changeset obsolete by other""" |
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if ctx.node()is None: |
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return False |
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return bool(ctx._repo.obsoletedby(ctx.node())) and ctx.state().mutable |
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context.changectx.obsolete = obsolete |
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ohidden = context.changectx.hidden |
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def hidden(ctx): |
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"""hacked version fo hidden that also initialize hiddenrevs set |
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XXX we need something cleaner""" |
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# hack to fill hiddenrevs |
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# compute hidden (XXX should move elsewhere) |
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if not getattr(ctx._repo.changelog, 'hiddeninit', False): |
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shown = ['not obsolete()', '.', 'bookmark()', 'tagged()', |
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'publishedheads()'] |
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basicquery = 'obsolete() - (::(%s))' % (' or '.join(shown)) |
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for rev in scmutil.revrange(ctx._repo, [basicquery]): |
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ctx._repo.changelog.hiddenrevs.add(rev) |
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ctx._repo.changelog.hiddeninit = True |
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return ohidden(ctx) |
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context.changectx.hidden = hidden |
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### revset |
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############################# |
123 |
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def revsetobsolete(repo, subset, x): |
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"""filter obsolet entry""" |
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args = revset.getargs(x, 0, 0, 'publicheads takes no arguments') |
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# XXX slow stop using context |
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return [r for r in subset if repo[r].obsolete()] |
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### Other Extension compat |
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############################ |
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132 |
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def concludenode(orig, repo, rev, *args, **kwargs): |
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"""wrapper for rebase 's concludenode that set obsolete relation""" |
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newrev = orig(repo, rev, *args, **kwargs) |
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oldnode = repo[rev].node() |
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newnode = repo[newrev].node() |
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repo.addobsolete(newnode, oldnode) |
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return newrev |
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140 |
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### Filter obsolet changeset |
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############################ |
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143 |
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def filterobsoleteout(orig, repo, remote, *args,**kwargs): |
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"""wrapper for findcommonoutgoing that remove obsolete changeset |
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This behaviour is temporary""" |
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common, heads = orig(repo, remote, *args, **kwargs) |
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# filter obsolete |
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heads = set(map(repo.changelog.rev, heads)) |
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obsoletes = set() |
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for obj in repo._obsobjrels: |
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try: |
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obsoletes.add(repo.changelog.rev(obj)) |
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except error.LookupError: |
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pass # we don't have this node locally |
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outgoing = set(repo.changelog.ancestors(*heads)) |
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outgoing.update(heads) |
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selected = outgoing - obsoletes |
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heads = sorted(map(repo.changelog.node, selected)) |
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return common, heads |
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39 | 167 |
def extsetup(ui): |
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try: |
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rebase = extensions.find('states') |
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except KeyError: |
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raise error.Abort(_('obsolete extension require states extension.')) |
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revset.symbols["obsolete"] = revsetobsolete |
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extensions.wrapfunction(discovery, 'findcommonoutgoing', filterobsoleteout) |
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try: |
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rebase = extensions.find('rebase') |
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if rebase: |
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extensions.wrapfunction(rebase, 'concludenode', concludenode) |
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except KeyError: |
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pass # rebase not found |
39 | 183 |
|
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# Pushkey mechanism for mutable |
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######################################### |
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186 |
|
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def pushobsolete(repo, key, old, raw): |
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"""push obsolete relation through pushkey""" |
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assert key == "relations" |
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w = repo.wlock() |
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try: |
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tmp = StringIO() |
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tmp.write(raw) |
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tmp.seek(0) |
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relations = _obsdeserialise(tmp) |
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for sub, objs in relations.iteritems(): |
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for obj in objs: |
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try: |
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repo.addobsolete(sub, obj) |
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except error.RepoLookupError: |
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pass |
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return 0 |
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finally: |
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w.release() |
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def listobsolete(repo): |
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"""dump all obsolete relation in |
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XXX this have be improved""" |
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tmp = StringIO() |
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_obsserialise(repo._obssubrels, tmp) |
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return {'relations': tmp.getvalue()} |
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pushkey.register('obsolete', pushobsolete, listobsolete) |
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|
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### New commands |
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############################# |
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def cmddebugobsolete(ui, repo, subject, object): |
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"""Add an obsolete relation between a too node |
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The subject is expected to be a newer version of the object""" |
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sub = repo[subject] |
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obj = repo[object] |
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repo.addobsolete(sub.node(), obj.node()) |
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return 0 |
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cmdtable = {'debugobsolete': (cmddebugobsolete, [], '<subject> <object>')} |
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### serialisation |
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############################# |
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def _obsserialise(obssubrels, flike): |
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"""serialise an obsolete relation mapping in a plain text one |
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this is for subject -> [objects] mapping |
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format is:: |
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<subject-full-hex> <object-full-hex>\n""" |
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for sub, objs in obssubrels.iteritems(): |
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for obj in objs: |
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flike.write('%s %s\n' % (hex(sub), hex(obj))) |
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def _obsdeserialise(flike): |
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"""read a file like object serialised with _obsserialise |
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this desierialize into a {subject -> objects} mapping""" |
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rels = {} |
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for line in flike: |
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subhex, objhex = line.split() |
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rels.setdefault(bin(subhex), set()).add(bin(objhex)) |
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return rels |
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def reposetup(ui, repo): |
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if not repo.local(): |
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return |
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opull = repo.pull |
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opush = repo.push |
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orollback = repo.rollback |
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o_writejournal = repo._writejournal |
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ocancopy = repo.cancopy |
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class obsoletingrepo(repo.__class__): |
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### Public method |
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def obsoletedby(self, node): |
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"""return the set of node that make <node> obsolete (obj)""" |
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return self._obsobjrels.get(node, set()) |
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def obsolete(self, node): |
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"""return the set of node that <node> make obsolete (sub)""" |
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return self._obssubrels.get(node, set()) |
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def addobsolete(self, sub, obj): |
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"""Add a relation marking that node <sub> is a new version of <obj>""" |
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self._obssubrels.setdefault(sub, set()).add(obj) |
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self._obsobjrels.setdefault(obj, set()).add(sub) |
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try: |
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if not self.nodestate(obj).mutable: |
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self.ui.warn( |
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_("%(sub)s try to obsolete immutable changeset %(obj)s\n") |
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% {'sub': short(sub), 'obj': short(obj)}) |
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self.changelog.hiddenrevs.add(repo[obj].rev()) |
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except (error.RepoLookupError, error.LookupError): |
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pass #unknow revision (but keep propagating the data |
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self._writeobsrels() |
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### obsolete storage |
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@util.propertycache |
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def _obsobjrels(self): |
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"""{<old-node> -> set(<new-node>)} |
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also compute hidden revision""" |
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#reverse sub -> objs mapping |
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objrels = {} |
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for sub, objs in self._obssubrels.iteritems(): |
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for obj in objs: |
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objrels.setdefault(obj, set()).add(sub) |
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return objrels |
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@util.propertycache |
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def _obssubrels(self): |
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"""{<new-node> -> set(<old-node>)}""" |
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return self._readobsrels() |
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|
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### Disk IO |
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def _readobsrels(self): |
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"""Write obsolete relation on disk""" |
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# XXX handle lock |
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try: |
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f = self.opener('obsolete-relations') |
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try: |
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return _obsdeserialise(f) |
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finally: |
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f.close() |
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except IOError: |
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return {} |
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def _writeobsrels(self): |
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"""Write obsolete relation on disk""" |
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# XXX handle lock |
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f = self.opener('obsolete-relations', 'w', atomictemp=True) |
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try: |
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_obsserialise(self._obssubrels, f) |
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f.rename() |
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finally: |
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f.close() |
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|
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### local clone support |
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def cancopy(self): |
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"""wrapper on cancopy that deny copy if there is obsolete relation""" |
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return ocancopy() and not bool(self._obsobjrels) # you can't copy if there is obsolete |
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### pull // push support |
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def pull(self, remote, *args, **kwargs): |
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"""wrapper around push that push obsolete relation""" |
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result = opull(remote, *args, **kwargs) |
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if 'obsolete' in remote.listkeys('namespaces'): |
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tmp = StringIO() |
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tmp.write(remote.listkeys('obsolete')['relations']) |
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tmp.seek(0) |
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obsrels = _obsdeserialise(tmp) |
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for sub, objs in obsrels.iteritems(): |
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for obj in objs: |
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self.addobsolete(sub, obj) |
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return result |
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def push(self, remote, *args, **opts): |
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"""wrapper around pull that pull obsolete relation""" |
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result = opush(remote, *args, **opts) |
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if 'obsolete' in remote.listkeys('namespaces'): |
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tmp = StringIO() |
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_obsserialise(self._obssubrels, tmp) |
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remote.pushkey('obsolete', 'relations', '', tmp.getvalue()) |
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return result |
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### rollback support |
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def _writejournal(self, desc): |
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"""wrapped version of _writejournal that save obsolete data""" |
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entries = list(o_writejournal(desc)) |
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filename = 'obsolete-relations' |
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filepath = self.join(filename) |
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if os.path.exists(filepath): |
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journalname = 'journal.' + filename |
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journalpath = self.join(journalname) |
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util.copyfile(filepath, journalpath) |
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entries.append(journalpath) |
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return tuple(entries) |
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def rollback(self, dryrun=False): |
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"""wrapped version of rollback that restore obsolete data""" |
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wlock = lock = None |
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try: |
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wlock = self.wlock() |
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lock = self.lock() |
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ret = orollback(dryrun) |
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if not (ret or dryrun): #rollback did not failed |
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src = self.join('undo.obsolete-relations') |
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dst = self.join('obsolete-relations') |
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if os.path.exists(src): |
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util.rename(src, dst) |
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elif os.path.exists(dst): #unlink in any case |
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os.unlink(dst) |
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# invalidate cache |
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self.__dict__.pop('_obssubrels', None) |
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self.__dict__.pop('_obsobjrels', None) |
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return ret |
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finally: |
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release(lock, wlock) |
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repo.__class__ = obsoletingrepo |
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