mercurial/repoview.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Sun, 06 Oct 2019 23:36:51 -0400
changeset 43134 75ad8af9c95e
parent 43090 1f339b503a40
child 43240 4353942be294
permissions -rw-r--r--
upgrade: allow upgrade to repository using sidedata Repository can now be migrated to support sidedata. More requirements and migration will be needed to actual side-data usage. This is a step in that direction. To test the feature, we leverage the test extension. It make sure the `update` part of the side-data migration actually works. Differential Revision: https://phab.mercurial-scm.org/D6942
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# repoview.py - Filtered view of a localrepo object
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#
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# Copyright 2012 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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from __future__ import absolute_import
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import copy
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import weakref
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from .node import nullrev
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from .pycompat import (
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    delattr,
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    getattr,
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    setattr,
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)
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from . import (
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    obsolete,
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    phases,
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    pycompat,
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    tags as tagsmod,
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    util,
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)
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from .utils import repoviewutil
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def hideablerevs(repo):
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    """Revision candidates to be hidden
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    This is a standalone function to allow extensions to wrap it.
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    Because we use the set of immutable changesets as a fallback subset in
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    branchmap (see mercurial.utils.repoviewutils.subsettable), you cannot set
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    "public" changesets as "hideable". Doing so would break multiple code
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    assertions and lead to crashes."""
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    obsoletes = obsolete.getrevs(repo, b'obsolete')
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    internals = repo._phasecache.getrevset(repo, phases.localhiddenphases)
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    internals = frozenset(internals)
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    return obsoletes | internals
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def pinnedrevs(repo):
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    """revisions blocking hidden changesets from being filtered
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    """
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    cl = repo.changelog
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    pinned = set()
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    pinned.update([par.rev() for par in repo[None].parents()])
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    pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()])
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    tags = {}
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    tagsmod.readlocaltags(repo.ui, repo, tags, {})
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    if tags:
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        rev, nodemap = cl.rev, cl.nodemap
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        pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap)
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    return pinned
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def _revealancestors(pfunc, hidden, revs):
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    """reveals contiguous chains of hidden ancestors of 'revs' by removing them
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    from 'hidden'
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    - pfunc(r): a funtion returning parent of 'r',
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    - hidden: the (preliminary) hidden revisions, to be updated
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    - revs: iterable of revnum,
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    (Ancestors are revealed exclusively, i.e. the elements in 'revs' are
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    *not* revealed)
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    """
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    stack = list(revs)
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    while stack:
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        for p in pfunc(stack.pop()):
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            if p != nullrev and p in hidden:
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                hidden.remove(p)
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                stack.append(p)
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def computehidden(repo, visibilityexceptions=None):
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    """compute the set of hidden revision to filter
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    During most operation hidden should be filtered."""
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    assert not repo.changelog.filteredrevs
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    hidden = hideablerevs(repo)
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    if hidden:
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        hidden = set(hidden - pinnedrevs(repo))
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        if visibilityexceptions:
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            hidden -= visibilityexceptions
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        pfunc = repo.changelog.parentrevs
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        mutable = repo._phasecache.getrevset(repo, phases.mutablephases)
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        visible = mutable - hidden
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        _revealancestors(pfunc, hidden, visible)
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    return frozenset(hidden)
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def computesecret(repo, visibilityexceptions=None):
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    """compute the set of revision that can never be exposed through hgweb
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    Changeset in the secret phase (or above) should stay unaccessible."""
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    assert not repo.changelog.filteredrevs
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    secrets = repo._phasecache.getrevset(repo, phases.remotehiddenphases)
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    return frozenset(secrets)
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def computeunserved(repo, visibilityexceptions=None):
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    """compute the set of revision that should be filtered when used a server
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    Secret and hidden changeset should not pretend to be here."""
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    assert not repo.changelog.filteredrevs
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    # fast path in simple case to avoid impact of non optimised code
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    hiddens = filterrevs(repo, b'visible')
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    secrets = filterrevs(repo, b'served.hidden')
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    if secrets:
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        return frozenset(hiddens | secrets)
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    else:
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        return hiddens
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def computemutable(repo, visibilityexceptions=None):
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    assert not repo.changelog.filteredrevs
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    # fast check to avoid revset call on huge repo
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    if any(repo._phasecache.phaseroots[1:]):
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        getphase = repo._phasecache.phase
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        maymutable = filterrevs(repo, b'base')
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        return frozenset(r for r in maymutable if getphase(repo, r))
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    return frozenset()
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def computeimpactable(repo, visibilityexceptions=None):
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    """Everything impactable by mutable revision
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    The immutable filter still have some chance to get invalidated. This will
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    happen when:
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    - you garbage collect hidden changeset,
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    - public phase is moved backward,
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    - something is changed in the filtering (this could be fixed)
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    This filter out any mutable changeset and any public changeset that may be
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    impacted by something happening to a mutable revision.
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    This is achieved by filtered everything with a revision number egal or
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    higher than the first mutable changeset is filtered."""
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    assert not repo.changelog.filteredrevs
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    cl = repo.changelog
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    firstmutable = len(cl)
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    for roots in repo._phasecache.phaseroots[1:]:
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        if roots:
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            firstmutable = min(firstmutable, min(cl.rev(r) for r in roots))
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    # protect from nullrev root
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    firstmutable = max(0, firstmutable)
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    return frozenset(pycompat.xrange(firstmutable, len(cl)))
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# function to compute filtered set
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#
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# When adding a new filter you MUST update the table at:
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#     mercurial.utils.repoviewutil.subsettable
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# Otherwise your filter will have to recompute all its branches cache
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# from scratch (very slow).
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filtertable = {
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    b'visible': computehidden,
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    b'visible-hidden': computehidden,
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    b'served.hidden': computesecret,
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    b'served': computeunserved,
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    b'immutable': computemutable,
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    b'base': computeimpactable,
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}
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_basefiltername = list(filtertable)
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def extrafilter(ui):
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    """initialize extra filter and return its id
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    If extra filtering is configured, we make sure the associated filtered view
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    are declared and return the associated id.
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    """
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    frevs = ui.config(b'experimental', b'extra-filter-revs')
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    if frevs is None:
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        return None
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    fid = pycompat.sysbytes(util.DIGESTS[b'sha1'](frevs).hexdigest())[:12]
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    combine = lambda fname: fname + b'%' + fid
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    subsettable = repoviewutil.subsettable
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    if combine(b'base') not in filtertable:
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        for name in _basefiltername:
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            def extrafilteredrevs(repo, *args, **kwargs):
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                baserevs = filtertable[name](repo, *args, **kwargs)
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                extrarevs = frozenset(repo.revs(frevs))
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                return baserevs | extrarevs
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            filtertable[combine(name)] = extrafilteredrevs
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            if name in subsettable:
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                subsettable[combine(name)] = combine(subsettable[name])
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    return fid
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def filterrevs(repo, filtername, visibilityexceptions=None):
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    """returns set of filtered revision for this filter name
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    visibilityexceptions is a set of revs which must are exceptions for
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    hidden-state and must be visible. They are dynamic and hence we should not
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    cache it's result"""
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    if filtername not in repo.filteredrevcache:
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        func = filtertable[filtername]
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        if visibilityexceptions:
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            return func(repo.unfiltered, visibilityexceptions)
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        repo.filteredrevcache[filtername] = func(repo.unfiltered())
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    return repo.filteredrevcache[filtername]
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class repoview(object):
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    """Provide a read/write view of a repo through a filtered changelog
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    This object is used to access a filtered version of a repository without
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    altering the original repository object itself. We can not alter the
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    original object for two main reasons:
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    - It prevents the use of a repo with multiple filters at the same time. In
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      particular when multiple threads are involved.
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    - It makes scope of the filtering harder to control.
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    This object behaves very closely to the original repository. All attribute
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    operations are done on the original repository:
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    - An access to `repoview.someattr` actually returns `repo.someattr`,
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    - A write to `repoview.someattr` actually sets value of `repo.someattr`,
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    - A deletion of `repoview.someattr` actually drops `someattr`
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      from `repo.__dict__`.
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    The only exception is the `changelog` property. It is overridden to return
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    a (surface) copy of `repo.changelog` with some revisions filtered. The
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    `filtername` attribute of the view control the revisions that need to be
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    filtered.  (the fact the changelog is copied is an implementation detail).
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    Unlike attributes, this object intercepts all method calls. This means that
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    all methods are run on the `repoview` object with the filtered `changelog`
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    property. For this purpose the simple `repoview` class must be mixed with
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    the actual class of the repository. This ensures that the resulting
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    `repoview` object have the very same methods than the repo object. This
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    leads to the property below.
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        repoview.method() --> repo.__class__.method(repoview)
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    The inheritance has to be done dynamically because `repo` can be of any
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    subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`.
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    """
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    def __init__(self, repo, filtername, visibilityexceptions=None):
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        object.__setattr__(self, r'_unfilteredrepo', repo)
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        object.__setattr__(self, r'filtername', filtername)
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        object.__setattr__(self, r'_clcachekey', None)
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        object.__setattr__(self, r'_clcache', None)
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        # revs which are exceptions and must not be hidden
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        object.__setattr__(self, r'_visibilityexceptions', visibilityexceptions)
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    # not a propertycache on purpose we shall implement a proper cache later
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    @property
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    def changelog(self):
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        """return a filtered version of the changeset
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        this changelog must not be used for writing"""
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        # some cache may be implemented later
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        unfi = self._unfilteredrepo
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        unfichangelog = unfi.changelog
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        # bypass call to changelog.method
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        unfiindex = unfichangelog.index
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        unfilen = len(unfiindex)
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        unfinode = unfiindex[unfilen - 1][7]
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        revs = filterrevs(unfi, self.filtername, self._visibilityexceptions)
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        cl = self._clcache
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        newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed)
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        # if cl.index is not unfiindex, unfi.changelog would be
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        # recreated, and our clcache refers to garbage object
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        if cl is not None and (
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            cl.index is not unfiindex or newkey != self._clcachekey
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        ):
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            cl = None
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        # could have been made None by the previous if
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        if cl is None:
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            cl = copy.copy(unfichangelog)
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            cl.filteredrevs = revs
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            object.__setattr__(self, r'_clcache', cl)
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            object.__setattr__(self, r'_clcachekey', newkey)
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        return cl
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    def unfiltered(self):
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        """Return an unfiltered version of a repo"""
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        return self._unfilteredrepo
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    def filtered(self, name, visibilityexceptions=None):
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        """Return a filtered version of a repository"""
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        if name == self.filtername and not visibilityexceptions:
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            return self
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        return self.unfiltered().filtered(name, visibilityexceptions)
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    def __repr__(self):
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        return r'<%s:%s %r>' % (
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            self.__class__.__name__,
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            pycompat.sysstr(self.filtername),
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            self.unfiltered(),
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        )
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    # everything access are forwarded to the proxied repo
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    def __getattr__(self, attr):
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        return getattr(self._unfilteredrepo, attr)
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    def __setattr__(self, attr, value):
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        return setattr(self._unfilteredrepo, attr, value)
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    def __delattr__(self, attr):
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        return delattr(self._unfilteredrepo, attr)
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# Python <3.4 easily leaks types via __mro__. See
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# https://bugs.python.org/issue17950. We cache dynamically created types
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# so they won't be leaked on every invocation of repo.filtered().
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_filteredrepotypes = weakref.WeakKeyDictionary()
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def newtype(base):
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    """Create a new type with the repoview mixin and the given base class"""
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    if base not in _filteredrepotypes:
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        class filteredrepo(repoview, base):
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            pass
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        _filteredrepotypes[base] = filteredrepo
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    return _filteredrepotypes[base]