Mercurial > hg
view mercurial/repoview.py @ 50291:862969b6c359 stable
undo-files: cleanup legacy files when applicable
The "journal" code is much more compact in 6.4, and so is the "undo" files as a
result. However the previous version were much noisier, so let us cleanup undo
files from older version too.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 07 Mar 2023 03:42:40 +0100 |
parents | d44e3c45f0e4 |
children | 1680ef94ad2b |
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# repoview.py - Filtered view of a localrepo object # # Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org> # Logilab SA <contact@logilab.fr> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. import copy import weakref from .i18n import _ from .node import ( hex, nullrev, ) from .pycompat import ( delattr, getattr, setattr, ) from . import ( error, obsolete, phases, pycompat, tags as tagsmod, util, ) from .utils import repoviewutil def hideablerevs(repo): """Revision candidates to be hidden This is a standalone function to allow extensions to wrap it. Because we use the set of immutable changesets as a fallback subset in branchmap (see mercurial.utils.repoviewutils.subsettable), you cannot set "public" changesets as "hideable". Doing so would break multiple code assertions and lead to crashes.""" obsoletes = obsolete.getrevs(repo, b'obsolete') internals = repo._phasecache.getrevset(repo, phases.localhiddenphases) internals = frozenset(internals) return obsoletes | internals def pinnedrevs(repo): """revisions blocking hidden changesets from being filtered""" cl = repo.changelog pinned = set() pinned.update([par.rev() for par in repo[None].parents()]) pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()]) tags = {} tagsmod.readlocaltags(repo.ui, repo, tags, {}) if tags: rev = cl.index.get_rev pinned.update(rev(t[0]) for t in tags.values()) pinned.discard(None) # Avoid cycle: mercurial.filemerge -> mercurial.templater -> # mercurial.templatefuncs -> mercurial.revset -> mercurial.repoview -> # mercurial.mergestate -> mercurial.filemerge from . import mergestate ms = mergestate.mergestate.read(repo) if ms.active() and ms.unresolvedcount(): for node in (ms.local, ms.other): rev = cl.index.get_rev(node) if rev is not None: pinned.add(rev) return pinned def _revealancestors(pfunc, hidden, revs): """reveals contiguous chains of hidden ancestors of 'revs' by removing them from 'hidden' - pfunc(r): a funtion returning parent of 'r', - hidden: the (preliminary) hidden revisions, to be updated - revs: iterable of revnum, (Ancestors are revealed exclusively, i.e. the elements in 'revs' are *not* revealed) """ stack = list(revs) while stack: for p in pfunc(stack.pop()): if p != nullrev and p in hidden: hidden.remove(p) stack.append(p) def computehidden(repo, visibilityexceptions=None): """compute the set of hidden revision to filter During most operation hidden should be filtered.""" assert not repo.changelog.filteredrevs hidden = hideablerevs(repo) if hidden: hidden = set(hidden - pinnedrevs(repo)) if visibilityexceptions: hidden -= visibilityexceptions pfunc = repo.changelog.parentrevs mutable = repo._phasecache.getrevset(repo, phases.mutablephases) visible = mutable - hidden _revealancestors(pfunc, hidden, visible) return frozenset(hidden) def computesecret(repo, visibilityexceptions=None): """compute the set of revision that can never be exposed through hgweb Changeset in the secret phase (or above) should stay unaccessible.""" assert not repo.changelog.filteredrevs secrets = repo._phasecache.getrevset(repo, phases.remotehiddenphases) return frozenset(secrets) def computeunserved(repo, visibilityexceptions=None): """compute the set of revision that should be filtered when used a server Secret and hidden changeset should not pretend to be here.""" assert not repo.changelog.filteredrevs # fast path in simple case to avoid impact of non optimised code hiddens = filterrevs(repo, b'visible') secrets = filterrevs(repo, b'served.hidden') if secrets: return frozenset(hiddens | secrets) else: return hiddens def computemutable(repo, visibilityexceptions=None): assert not repo.changelog.filteredrevs # fast check to avoid revset call on huge repo if repo._phasecache.hasnonpublicphases(repo): return frozenset(repo._phasecache.getrevset(repo, phases.mutablephases)) return frozenset() def computeimpactable(repo, visibilityexceptions=None): """Everything impactable by mutable revision The immutable filter still have some chance to get invalidated. This will happen when: - you garbage collect hidden changeset, - public phase is moved backward, - something is changed in the filtering (this could be fixed) This filter out any mutable changeset and any public changeset that may be impacted by something happening to a mutable revision. This is achieved by filtered everything with a revision number equal or higher than the first mutable changeset is filtered.""" assert not repo.changelog.filteredrevs cl = repo.changelog firstmutable = len(cl) roots = repo._phasecache.nonpublicphaseroots(repo) if roots: firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) # protect from nullrev root firstmutable = max(0, firstmutable) return frozenset(range(firstmutable, len(cl))) # function to compute filtered set # # When adding a new filter you MUST update the table at: # mercurial.utils.repoviewutil.subsettable # Otherwise your filter will have to recompute all its branches cache # from scratch (very slow). filtertable = { b'visible': computehidden, b'visible-hidden': computehidden, b'served.hidden': computesecret, b'served': computeunserved, b'immutable': computemutable, b'base': computeimpactable, } # set of filter level that will include the working copy parent no matter what. filter_has_wc = {b'visible', b'visible-hidden'} _basefiltername = list(filtertable) def extrafilter(ui): """initialize extra filter and return its id If extra filtering is configured, we make sure the associated filtered view are declared and return the associated id. """ frevs = ui.config(b'experimental', b'extra-filter-revs') if frevs is None: return None fid = pycompat.sysbytes(util.DIGESTS[b'sha1'](frevs).hexdigest())[:12] combine = lambda fname: fname + b'%' + fid subsettable = repoviewutil.subsettable if combine(b'base') not in filtertable: for name in _basefiltername: def extrafilteredrevs(repo, *args, **kwargs): baserevs = filtertable[name](repo, *args, **kwargs) extrarevs = frozenset(repo.revs(frevs)) return baserevs | extrarevs filtertable[combine(name)] = extrafilteredrevs if name in subsettable: subsettable[combine(name)] = combine(subsettable[name]) return fid def filterrevs(repo, filtername, visibilityexceptions=None): """returns set of filtered revision for this filter name visibilityexceptions is a set of revs which must are exceptions for hidden-state and must be visible. They are dynamic and hence we should not cache it's result""" if filtername not in repo.filteredrevcache: if repo.ui.configbool(b'devel', b'debug.repo-filters'): msg = b'computing revision filter for "%s"' msg %= filtername if repo.ui.tracebackflag and repo.ui.debugflag: # XXX use ui.write_err util.debugstacktrace( msg, f=repo.ui._fout, otherf=repo.ui._ferr, prefix=b'debug.filters: ', ) else: repo.ui.debug(b'debug.filters: %s\n' % msg) func = filtertable[filtername] if visibilityexceptions: return func(repo.unfiltered, visibilityexceptions) repo.filteredrevcache[filtername] = func(repo.unfiltered()) return repo.filteredrevcache[filtername] def wrapchangelog(unfichangelog, filteredrevs): cl = copy.copy(unfichangelog) cl.filteredrevs = filteredrevs class filteredchangelog(filteredchangelogmixin, cl.__class__): pass cl.__class__ = filteredchangelog return cl class filteredchangelogmixin: def tiprev(self): """filtered version of revlog.tiprev""" for i in range(len(self) - 1, -2, -1): if i not in self.filteredrevs: return i def __contains__(self, rev): """filtered version of revlog.__contains__""" return 0 <= rev < len(self) and rev not in self.filteredrevs def __iter__(self): """filtered version of revlog.__iter__""" def filterediter(): for i in range(len(self)): if i not in self.filteredrevs: yield i return filterediter() def revs(self, start=0, stop=None): """filtered version of revlog.revs""" for i in super(filteredchangelogmixin, self).revs(start, stop): if i not in self.filteredrevs: yield i def _checknofilteredinrevs(self, revs): """raise the appropriate error if 'revs' contains a filtered revision This returns a version of 'revs' to be used thereafter by the caller. In particular, if revs is an iterator, it is converted into a set. """ safehasattr = util.safehasattr if safehasattr(revs, '__next__'): # Note that inspect.isgenerator() is not true for iterators, revs = set(revs) filteredrevs = self.filteredrevs if safehasattr(revs, 'first'): # smartset offenders = revs & filteredrevs else: offenders = filteredrevs.intersection(revs) for rev in offenders: raise error.FilteredIndexError(rev) return revs def headrevs(self, revs=None): if revs is None: try: return self.index.headrevsfiltered(self.filteredrevs) # AttributeError covers non-c-extension environments and # old c extensions without filter handling. except AttributeError: return self._headrevs() revs = self._checknofilteredinrevs(revs) return super(filteredchangelogmixin, self).headrevs(revs) def strip(self, *args, **kwargs): # XXX make something better than assert # We can't expect proper strip behavior if we are filtered. assert not self.filteredrevs super(filteredchangelogmixin, self).strip(*args, **kwargs) def rev(self, node): """filtered version of revlog.rev""" r = super(filteredchangelogmixin, self).rev(node) if r in self.filteredrevs: raise error.FilteredLookupError( hex(node), self.display_id, _(b'filtered node') ) return r def node(self, rev): """filtered version of revlog.node""" if rev in self.filteredrevs: raise error.FilteredIndexError(rev) return super(filteredchangelogmixin, self).node(rev) def linkrev(self, rev): """filtered version of revlog.linkrev""" if rev in self.filteredrevs: raise error.FilteredIndexError(rev) return super(filteredchangelogmixin, self).linkrev(rev) def parentrevs(self, rev): """filtered version of revlog.parentrevs""" if rev in self.filteredrevs: raise error.FilteredIndexError(rev) return super(filteredchangelogmixin, self).parentrevs(rev) def flags(self, rev): """filtered version of revlog.flags""" if rev in self.filteredrevs: raise error.FilteredIndexError(rev) return super(filteredchangelogmixin, self).flags(rev) class repoview: """Provide a read/write view of a repo through a filtered changelog This object is used to access a filtered version of a repository without altering the original repository object itself. We can not alter the original object for two main reasons: - It prevents the use of a repo with multiple filters at the same time. In particular when multiple threads are involved. - It makes scope of the filtering harder to control. This object behaves very closely to the original repository. All attribute operations are done on the original repository: - An access to `repoview.someattr` actually returns `repo.someattr`, - A write to `repoview.someattr` actually sets value of `repo.someattr`, - A deletion of `repoview.someattr` actually drops `someattr` from `repo.__dict__`. The only exception is the `changelog` property. It is overridden to return a (surface) copy of `repo.changelog` with some revisions filtered. The `filtername` attribute of the view control the revisions that need to be filtered. (the fact the changelog is copied is an implementation detail). Unlike attributes, this object intercepts all method calls. This means that all methods are run on the `repoview` object with the filtered `changelog` property. For this purpose the simple `repoview` class must be mixed with the actual class of the repository. This ensures that the resulting `repoview` object have the very same methods than the repo object. This leads to the property below. repoview.method() --> repo.__class__.method(repoview) The inheritance has to be done dynamically because `repo` can be of any subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. """ def __init__(self, repo, filtername, visibilityexceptions=None): object.__setattr__(self, '_unfilteredrepo', repo) object.__setattr__(self, 'filtername', filtername) object.__setattr__(self, '_clcachekey', None) object.__setattr__(self, '_clcache', None) # revs which are exceptions and must not be hidden object.__setattr__(self, '_visibilityexceptions', visibilityexceptions) # not a propertycache on purpose we shall implement a proper cache later @property def changelog(self): """return a filtered version of the changeset this changelog must not be used for writing""" # some cache may be implemented later unfi = self._unfilteredrepo unfichangelog = unfi.changelog # bypass call to changelog.method unfiindex = unfichangelog.index unfilen = len(unfiindex) unfinode = unfiindex[unfilen - 1][7] with util.timedcm('repo filter for %s', self.filtername): revs = filterrevs(unfi, self.filtername, self._visibilityexceptions) cl = self._clcache newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed) # if cl.index is not unfiindex, unfi.changelog would be # recreated, and our clcache refers to garbage object if cl is not None and ( cl.index is not unfiindex or newkey != self._clcachekey ): cl = None # could have been made None by the previous if if cl is None: # Only filter if there's something to filter cl = wrapchangelog(unfichangelog, revs) if revs else unfichangelog object.__setattr__(self, '_clcache', cl) object.__setattr__(self, '_clcachekey', newkey) return cl def unfiltered(self): """Return an unfiltered version of a repo""" return self._unfilteredrepo def filtered(self, name, visibilityexceptions=None): """Return a filtered version of a repository""" if name == self.filtername and not visibilityexceptions: return self return self.unfiltered().filtered(name, visibilityexceptions) def __repr__(self): return '<%s:%s %r>' % ( self.__class__.__name__, pycompat.sysstr(self.filtername), self.unfiltered(), ) # everything access are forwarded to the proxied repo def __getattr__(self, attr): return getattr(self._unfilteredrepo, attr) def __setattr__(self, attr, value): return setattr(self._unfilteredrepo, attr, value) def __delattr__(self, attr): return delattr(self._unfilteredrepo, attr) # Dynamically created classes introduce memory cycles via __mro__. See # https://bugs.python.org/issue17950. # This need of the garbage collector can turn into memory leak in # Python <3.4, which is the first version released with PEP 442. _filteredrepotypes = weakref.WeakKeyDictionary() def newtype(base): """Create a new type with the repoview mixin and the given base class""" ref = _filteredrepotypes.get(base) if ref is not None: cls = ref() if cls is not None: return cls class filteredrepo(repoview, base): pass _filteredrepotypes[base] = weakref.ref(filteredrepo) # do not reread from weakref to be 100% sure not to return None return filteredrepo