mercurial/repoview.py
author Martin von Zweigbergk <martinvonz@google.com>
Mon, 15 May 2017 00:12:19 -0700
changeset 42341 27d6956d386b
parent 42231 d345627d104b
child 43076 2372284d9457
permissions -rw-r--r--
match: use '' instead of '.' for root directory (API) I think '' is generally a better value for the root directory than '.' is. For example, os.path.join('', 'foo') => 'foo', while os.path.join('.', 'foo') => './foo'. This patch mostly makes it so we use '' internally in match.py. However, it also affects the API in visitdir(), visitchildrenset() and files(). The two former now also accept '' as input. I've updated the callers of these methods. I've also added a deprecation warning for passing '.' (for external callers). The only caller I could find that was affected by files() returning '' instead of '.' was in dirstate.walk(). I've updated that. The next few patches show some workarounds we can remove by using '' instead of '.'. Differential Revision: https://phab.mercurial-scm.org/D6401
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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 . 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 (
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    repoviewutil,
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)
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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, '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, 'visible')
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    secrets = filterrevs(repo, '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, '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 = {'visible': computehidden,
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               'visible-hidden': computehidden,
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               'served.hidden': computesecret,
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               'served': computeunserved,
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               'immutable':  computemutable,
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               'base':  computeimpactable}
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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('experimental', '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['sha1'](frevs).hexdigest())[:12]
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    combine = lambda fname: fname + '%' + fid
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    subsettable = repoviewutil.subsettable
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    if combine('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',
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                           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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            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>' % (self.__class__.__name__,
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                                pycompat.sysstr(self.filtername),
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                                self.unfiltered())
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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]