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# obsolete.py - obsolete markers handling
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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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"""Obsolete marker handling
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An obsolete marker maps an old changeset to a list of new
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changesets. If the list of new changesets is empty, the old changeset
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is said to be "killed". Otherwise, the old changeset is being
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"replaced" by the new changesets.
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Obsolete markers can be used to record and distribute changeset graph
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transformations performed by history rewrite operations, and help
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building new tools to reconcile conflicting rewrite actions. To
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facilitate conflict resolution, markers include various annotations
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besides old and news changeset identifiers, such as creation date or
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author name.
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The old obsoleted changeset is called a "predecessor" and possible
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replacements are called "successors". Markers that used changeset X as
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a predecessor are called "successor markers of X" because they hold
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information about the successors of X. Markers that use changeset Y as
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a successors are call "predecessor markers of Y" because they hold
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information about the predecessors of Y.
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Examples:
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- When changeset A is replaced by changeset A', one marker is stored:
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(A, (A',))
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- When changesets A and B are folded into a new changeset C, two markers are
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stored:
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(A, (C,)) and (B, (C,))
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- When changeset A is simply "pruned" from the graph, a marker is created:
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(A, ())
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- When changeset A is split into B and C, a single marker is used:
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(A, (B, C))
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We use a single marker to distinguish the "split" case from the "divergence"
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case. If two independent operations rewrite the same changeset A in to A' and
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A'', we have an error case: divergent rewriting. We can detect it because
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two markers will be created independently:
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(A, (B,)) and (A, (C,))
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Format
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------
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Markers are stored in an append-only file stored in
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'.hg/store/obsstore'.
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The file starts with a version header:
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- 1 unsigned byte: version number, starting at zero.
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The header is followed by the markers. Marker format depend of the version. See
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comment associated with each format for details.
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"""
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from __future__ import absolute_import
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import errno
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import struct
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from .i18n import _
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from .pycompat import getattr
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from .node import (
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bin,
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hex,
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nullid,
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)
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from . import (
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encoding,
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error,
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obsutil,
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phases,
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policy,
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pycompat,
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util,
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)
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from .utils import (
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dateutil,
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hashutil,
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)
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parsers = policy.importmod('parsers')
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_pack = struct.pack
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_unpack = struct.unpack
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_calcsize = struct.calcsize
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propertycache = util.propertycache
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# Options for obsolescence
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createmarkersopt = b'createmarkers'
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allowunstableopt = b'allowunstable'
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exchangeopt = b'exchange'
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def _getoptionvalue(repo, option):
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"""Returns True if the given repository has the given obsolete option
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enabled.
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"""
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configkey = b'evolution.%s' % option
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newconfig = repo.ui.configbool(b'experimental', configkey)
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# Return the value only if defined
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if newconfig is not None:
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return newconfig
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# Fallback on generic option
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try:
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return repo.ui.configbool(b'experimental', b'evolution')
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except (error.ConfigError, AttributeError):
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# Fallback on old-fashion config
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# inconsistent config: experimental.evolution
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result = set(repo.ui.configlist(b'experimental', b'evolution'))
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if b'all' in result:
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return True
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# Temporary hack for next check
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newconfig = repo.ui.config(b'experimental', b'evolution.createmarkers')
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if newconfig:
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result.add(b'createmarkers')
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return option in result
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def getoptions(repo):
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"""Returns dicts showing state of obsolescence features."""
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createmarkersvalue = _getoptionvalue(repo, createmarkersopt)
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unstablevalue = _getoptionvalue(repo, allowunstableopt)
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exchangevalue = _getoptionvalue(repo, exchangeopt)
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# createmarkers must be enabled if other options are enabled
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if (unstablevalue or exchangevalue) and not createmarkersvalue:
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raise error.Abort(
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_(
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b"'createmarkers' obsolete option must be enabled "
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b"if other obsolete options are enabled"
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)
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)
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return {
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createmarkersopt: createmarkersvalue,
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allowunstableopt: unstablevalue,
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exchangeopt: exchangevalue,
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}
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def isenabled(repo, option):
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"""Returns True if the given repository has the given obsolete option
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enabled.
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"""
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return getoptions(repo)[option]
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# Creating aliases for marker flags because evolve extension looks for
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# bumpedfix in obsolete.py
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bumpedfix = obsutil.bumpedfix
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usingsha256 = obsutil.usingsha256
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## Parsing and writing of version "0"
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#
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# The header is followed by the markers. Each marker is made of:
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#
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# - 1 uint8 : number of new changesets "N", can be zero.
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#
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# - 1 uint32: metadata size "M" in bytes.
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#
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# - 1 byte: a bit field. It is reserved for flags used in common
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# obsolete marker operations, to avoid repeated decoding of metadata
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# entries.
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#
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# - 20 bytes: obsoleted changeset identifier.
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#
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# - N*20 bytes: new changesets identifiers.
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#
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# - M bytes: metadata as a sequence of nul-terminated strings. Each
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# string contains a key and a value, separated by a colon ':', without
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# additional encoding. Keys cannot contain '\0' or ':' and values
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# cannot contain '\0'.
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_fm0version = 0
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_fm0fixed = b'>BIB20s'
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_fm0node = b'20s'
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_fm0fsize = _calcsize(_fm0fixed)
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_fm0fnodesize = _calcsize(_fm0node)
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def _fm0readmarkers(data, off, stop):
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# Loop on markers
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while off < stop:
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# read fixed part
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cur = data[off : off + _fm0fsize]
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off += _fm0fsize
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numsuc, mdsize, flags, pre = _unpack(_fm0fixed, cur)
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# read replacement
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sucs = ()
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if numsuc:
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s = _fm0fnodesize * numsuc
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cur = data[off : off + s]
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sucs = _unpack(_fm0node * numsuc, cur)
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off += s
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# read metadata
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# (metadata will be decoded on demand)
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metadata = data[off : off + mdsize]
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if len(metadata) != mdsize:
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raise error.Abort(
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_(
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b'parsing obsolete marker: metadata is too '
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b'short, %d bytes expected, got %d'
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)
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% (mdsize, len(metadata))
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)
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off += mdsize
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metadata = _fm0decodemeta(metadata)
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try:
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when, offset = metadata.pop(b'date', b'0 0').split(b' ')
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date = float(when), int(offset)
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except ValueError:
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date = (0.0, 0)
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parents = None
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if b'p2' in metadata:
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parents = (metadata.pop(b'p1', None), metadata.pop(b'p2', None))
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elif b'p1' in metadata:
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parents = (metadata.pop(b'p1', None),)
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elif b'p0' in metadata:
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parents = ()
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if parents is not None:
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try:
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parents = tuple(bin(p) for p in parents)
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# if parent content is not a nodeid, drop the data
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for p in parents:
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if len(p) != 20:
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parents = None
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break
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except TypeError:
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# if content cannot be translated to nodeid drop the data.
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parents = None
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metadata = tuple(sorted(pycompat.iteritems(metadata)))
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yield (pre, sucs, flags, metadata, date, parents)
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def _fm0encodeonemarker(marker):
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pre, sucs, flags, metadata, date, parents = marker
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if flags & usingsha256:
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raise error.Abort(_(b'cannot handle sha256 with old obsstore format'))
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metadata = dict(metadata)
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time, tz = date
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metadata[b'date'] = b'%r %i' % (time, tz)
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if parents is not None:
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if not parents:
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# mark that we explicitly recorded no parents
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metadata[b'p0'] = b''
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for i, p in enumerate(parents, 1):
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metadata[b'p%i' % i] = hex(p)
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metadata = _fm0encodemeta(metadata)
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numsuc = len(sucs)
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format = _fm0fixed + (_fm0node * numsuc)
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data = [numsuc, len(metadata), flags, pre]
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data.extend(sucs)
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return _pack(format, *data) + metadata
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def _fm0encodemeta(meta):
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"""Return encoded metadata string to string mapping.
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Assume no ':' in key and no '\0' in both key and value."""
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for key, value in pycompat.iteritems(meta):
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if b':' in key or b'\0' in key:
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raise ValueError(b"':' and '\0' are forbidden in metadata key'")
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if b'\0' in value:
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raise ValueError(b"':' is forbidden in metadata value'")
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return b'\0'.join([b'%s:%s' % (k, meta[k]) for k in sorted(meta)])
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def _fm0decodemeta(data):
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"""Return string to string dictionary from encoded version."""
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d = {}
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for l in data.split(b'\0'):
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if l:
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key, value = l.split(b':', 1)
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d[key] = value
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return d
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## Parsing and writing of version "1"
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#
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# The header is followed by the markers. Each marker is made of:
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#
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# - uint32: total size of the marker (including this field)
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#
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# - float64: date in seconds since epoch
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#
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# - int16: timezone offset in minutes
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#
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# - uint16: a bit field. It is reserved for flags used in common
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# obsolete marker operations, to avoid repeated decoding of metadata
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# entries.
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#
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# - uint8: number of successors "N", can be zero.
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#
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# - uint8: number of parents "P", can be zero.
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#
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# 0: parents data stored but no parent,
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# 1: one parent stored,
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# 2: two parents stored,
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# 3: no parent data stored
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#
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# - uint8: number of metadata entries M
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#
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# - 20 or 32 bytes: predecessor changeset identifier.
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#
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# - N*(20 or 32) bytes: successors changesets identifiers.
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#
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# - P*(20 or 32) bytes: parents of the predecessors changesets.
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#
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# - M*(uint8, uint8): size of all metadata entries (key and value)
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#
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# - remaining bytes: the metadata, each (key, value) pair after the other.
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_fm1version = 1
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_fm1fixed = b'>IdhHBBB'
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_fm1nodesha1 = b'20s'
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_fm1nodesha256 = b'32s'
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_fm1nodesha1size = _calcsize(_fm1nodesha1)
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_fm1nodesha256size = _calcsize(_fm1nodesha256)
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_fm1fsize = _calcsize(_fm1fixed)
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_fm1parentnone = 3
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_fm1parentshift = 14
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_fm1parentmask = _fm1parentnone << _fm1parentshift
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_fm1metapair = b'BB'
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_fm1metapairsize = _calcsize(_fm1metapair)
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def _fm1purereadmarkers(data, off, stop):
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# make some global constants local for performance
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noneflag = _fm1parentnone
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sha2flag = usingsha256
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sha1size = _fm1nodesha1size
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sha2size = _fm1nodesha256size
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sha1fmt = _fm1nodesha1
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sha2fmt = _fm1nodesha256
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metasize = _fm1metapairsize
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metafmt = _fm1metapair
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fsize = _fm1fsize
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unpack = _unpack
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# Loop on markers
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ufixed = struct.Struct(_fm1fixed).unpack
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while off < stop:
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# read fixed part
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o1 = off + fsize
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t, secs, tz, flags, numsuc, numpar, nummeta = ufixed(data[off:o1])
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if flags & sha2flag:
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nodefmt = sha2fmt
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nodesize = sha2size
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else:
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nodefmt = sha1fmt
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nodesize = sha1size
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(prec,) = unpack(nodefmt, data[o1 : o1 + nodesize])
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o1 += nodesize
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# read 0 or more successors
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if numsuc == 1:
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o2 = o1 + nodesize
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sucs = (data[o1:o2],)
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else:
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o2 = o1 + nodesize * numsuc
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sucs = unpack(nodefmt * numsuc, data[o1:o2])
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# read parents
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if numpar == noneflag:
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o3 = o2
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parents = None
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elif numpar == 1:
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o3 = o2 + nodesize
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parents = (data[o2:o3],)
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else:
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o3 = o2 + nodesize * numpar
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parents = unpack(nodefmt * numpar, data[o2:o3])
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# read metadata
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off = o3 + metasize * nummeta
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metapairsize = unpack(b'>' + (metafmt * nummeta), data[o3:off])
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metadata = []
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for idx in pycompat.xrange(0, len(metapairsize), 2):
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o1 = off + metapairsize[idx]
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o2 = o1 + metapairsize[idx + 1]
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metadata.append((data[off:o1], data[o1:o2]))
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off = o2
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yield (prec, sucs, flags, tuple(metadata), (secs, tz * 60), parents)
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def _fm1encodeonemarker(marker):
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pre, sucs, flags, metadata, date, parents = marker
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# determine node size
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_fm1node = _fm1nodesha1
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if flags & usingsha256:
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_fm1node = _fm1nodesha256
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numsuc = len(sucs)
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numextranodes = 1 + numsuc
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if parents is None:
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numpar = _fm1parentnone
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else:
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numpar = len(parents)
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numextranodes += numpar
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formatnodes = _fm1node * numextranodes
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formatmeta = _fm1metapair * len(metadata)
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format = _fm1fixed + formatnodes + formatmeta
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# tz is stored in minutes so we divide by 60
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tz = date[1] // 60
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data = [None, date[0], tz, flags, numsuc, numpar, len(metadata), pre]
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data.extend(sucs)
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if parents is not None:
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data.extend(parents)
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totalsize = _calcsize(format)
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for key, value in metadata:
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lk = len(key)
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lv = len(value)
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if lk > 255:
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msg = (
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b'obsstore metadata key cannot be longer than 255 bytes'
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b' (key "%s" is %u bytes)'
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) % (key, lk)
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raise error.ProgrammingError(msg)
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if lv > 255:
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msg = (
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b'obsstore metadata value cannot be longer than 255 bytes'
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|
b' (value "%s" for key "%s" is %u bytes)'
|
|
|
) % (value, key, lv)
|
|
|
raise error.ProgrammingError(msg)
|
|
|
data.append(lk)
|
|
|
data.append(lv)
|
|
|
totalsize += lk + lv
|
|
|
data[0] = totalsize
|
|
|
data = [_pack(format, *data)]
|
|
|
for key, value in metadata:
|
|
|
data.append(key)
|
|
|
data.append(value)
|
|
|
return b''.join(data)
|
|
|
|
|
|
|
|
|
def _fm1readmarkers(data, off, stop):
|
|
|
native = getattr(parsers, 'fm1readmarkers', None)
|
|
|
if not native:
|
|
|
return _fm1purereadmarkers(data, off, stop)
|
|
|
return native(data, off, stop)
|
|
|
|
|
|
|
|
|
# mapping to read/write various marker formats
|
|
|
# <version> -> (decoder, encoder)
|
|
|
formats = {
|
|
|
_fm0version: (_fm0readmarkers, _fm0encodeonemarker),
|
|
|
_fm1version: (_fm1readmarkers, _fm1encodeonemarker),
|
|
|
}
|
|
|
|
|
|
|
|
|
def _readmarkerversion(data):
|
|
|
return _unpack(b'>B', data[0:1])[0]
|
|
|
|
|
|
|
|
|
@util.nogc
|
|
|
def _readmarkers(data, off=None, stop=None):
|
|
|
"""Read and enumerate markers from raw data"""
|
|
|
diskversion = _readmarkerversion(data)
|
|
|
if not off:
|
|
|
off = 1 # skip 1 byte version number
|
|
|
if stop is None:
|
|
|
stop = len(data)
|
|
|
if diskversion not in formats:
|
|
|
msg = _(b'parsing obsolete marker: unknown version %r') % diskversion
|
|
|
raise error.UnknownVersion(msg, version=diskversion)
|
|
|
return diskversion, formats[diskversion][0](data, off, stop)
|
|
|
|
|
|
|
|
|
def encodeheader(version=_fm0version):
|
|
|
return _pack(b'>B', version)
|
|
|
|
|
|
|
|
|
def encodemarkers(markers, addheader=False, version=_fm0version):
|
|
|
# Kept separate from flushmarkers(), it will be reused for
|
|
|
# markers exchange.
|
|
|
encodeone = formats[version][1]
|
|
|
if addheader:
|
|
|
yield encodeheader(version)
|
|
|
for marker in markers:
|
|
|
yield encodeone(marker)
|
|
|
|
|
|
|
|
|
@util.nogc
|
|
|
def _addsuccessors(successors, markers):
|
|
|
for mark in markers:
|
|
|
successors.setdefault(mark[0], set()).add(mark)
|
|
|
|
|
|
|
|
|
@util.nogc
|
|
|
def _addpredecessors(predecessors, markers):
|
|
|
for mark in markers:
|
|
|
for suc in mark[1]:
|
|
|
predecessors.setdefault(suc, set()).add(mark)
|
|
|
|
|
|
|
|
|
@util.nogc
|
|
|
def _addchildren(children, markers):
|
|
|
for mark in markers:
|
|
|
parents = mark[5]
|
|
|
if parents is not None:
|
|
|
for p in parents:
|
|
|
children.setdefault(p, set()).add(mark)
|
|
|
|
|
|
|
|
|
def _checkinvalidmarkers(markers):
|
|
|
"""search for marker with invalid data and raise error if needed
|
|
|
|
|
|
Exist as a separated function to allow the evolve extension for a more
|
|
|
subtle handling.
|
|
|
"""
|
|
|
for mark in markers:
|
|
|
if nullid in mark[1]:
|
|
|
raise error.Abort(
|
|
|
_(
|
|
|
b'bad obsolescence marker detected: '
|
|
|
b'invalid successors nullid'
|
|
|
)
|
|
|
)
|
|
|
|
|
|
|
|
|
class obsstore(object):
|
|
|
"""Store obsolete markers
|
|
|
|
|
|
Markers can be accessed with two mappings:
|
|
|
- predecessors[x] -> set(markers on predecessors edges of x)
|
|
|
- successors[x] -> set(markers on successors edges of x)
|
|
|
- children[x] -> set(markers on predecessors edges of children(x)
|
|
|
"""
|
|
|
|
|
|
fields = (b'prec', b'succs', b'flag', b'meta', b'date', b'parents')
|
|
|
# prec: nodeid, predecessors changesets
|
|
|
# succs: tuple of nodeid, successor changesets (0-N length)
|
|
|
# flag: integer, flag field carrying modifier for the markers (see doc)
|
|
|
# meta: binary blob in UTF-8, encoded metadata dictionary
|
|
|
# date: (float, int) tuple, date of marker creation
|
|
|
# parents: (tuple of nodeid) or None, parents of predecessors
|
|
|
# None is used when no data has been recorded
|
|
|
|
|
|
def __init__(self, svfs, defaultformat=_fm1version, readonly=False):
|
|
|
# caches for various obsolescence related cache
|
|
|
self.caches = {}
|
|
|
self.svfs = svfs
|
|
|
self._defaultformat = defaultformat
|
|
|
self._readonly = readonly
|
|
|
|
|
|
def __iter__(self):
|
|
|
return iter(self._all)
|
|
|
|
|
|
def __len__(self):
|
|
|
return len(self._all)
|
|
|
|
|
|
def __nonzero__(self):
|
|
|
if not self._cached('_all'):
|
|
|
try:
|
|
|
return self.svfs.stat(b'obsstore').st_size > 1
|
|
|
except OSError as inst:
|
|
|
if inst.errno != errno.ENOENT:
|
|
|
raise
|
|
|
# just build an empty _all list if no obsstore exists, which
|
|
|
# avoids further stat() syscalls
|
|
|
return bool(self._all)
|
|
|
|
|
|
__bool__ = __nonzero__
|
|
|
|
|
|
@property
|
|
|
def readonly(self):
|
|
|
"""True if marker creation is disabled
|
|
|
|
|
|
Remove me in the future when obsolete marker is always on."""
|
|
|
return self._readonly
|
|
|
|
|
|
def create(
|
|
|
self,
|
|
|
transaction,
|
|
|
prec,
|
|
|
succs=(),
|
|
|
flag=0,
|
|
|
parents=None,
|
|
|
date=None,
|
|
|
metadata=None,
|
|
|
ui=None,
|
|
|
):
|
|
|
"""obsolete: add a new obsolete marker
|
|
|
|
|
|
* ensuring it is hashable
|
|
|
* check mandatory metadata
|
|
|
* encode metadata
|
|
|
|
|
|
If you are a human writing code creating marker you want to use the
|
|
|
`createmarkers` function in this module instead.
|
|
|
|
|
|
return True if a new marker have been added, False if the markers
|
|
|
already existed (no op).
|
|
|
"""
|
|
|
flag = int(flag)
|
|
|
if metadata is None:
|
|
|
metadata = {}
|
|
|
if date is None:
|
|
|
if b'date' in metadata:
|
|
|
# as a courtesy for out-of-tree extensions
|
|
|
date = dateutil.parsedate(metadata.pop(b'date'))
|
|
|
elif ui is not None:
|
|
|
date = ui.configdate(b'devel', b'default-date')
|
|
|
if date is None:
|
|
|
date = dateutil.makedate()
|
|
|
else:
|
|
|
date = dateutil.makedate()
|
|
|
if flag & usingsha256:
|
|
|
if len(prec) != 32:
|
|
|
raise ValueError(prec)
|
|
|
for succ in succs:
|
|
|
if len(succ) != 32:
|
|
|
raise ValueError(succ)
|
|
|
else:
|
|
|
if len(prec) != 20:
|
|
|
raise ValueError(prec)
|
|
|
for succ in succs:
|
|
|
if len(succ) != 20:
|
|
|
raise ValueError(succ)
|
|
|
if prec in succs:
|
|
|
raise ValueError(
|
|
|
'in-marker cycle with %s' % pycompat.sysstr(hex(prec))
|
|
|
)
|
|
|
|
|
|
metadata = tuple(sorted(pycompat.iteritems(metadata)))
|
|
|
for k, v in metadata:
|
|
|
try:
|
|
|
# might be better to reject non-ASCII keys
|
|
|
k.decode('utf-8')
|
|
|
v.decode('utf-8')
|
|
|
except UnicodeDecodeError:
|
|
|
raise error.ProgrammingError(
|
|
|
b'obsstore metadata must be valid UTF-8 sequence '
|
|
|
b'(key = %r, value = %r)'
|
|
|
% (pycompat.bytestr(k), pycompat.bytestr(v))
|
|
|
)
|
|
|
|
|
|
marker = (bytes(prec), tuple(succs), flag, metadata, date, parents)
|
|
|
return bool(self.add(transaction, [marker]))
|
|
|
|
|
|
def add(self, transaction, markers):
|
|
|
"""Add new markers to the store
|
|
|
|
|
|
Take care of filtering duplicate.
|
|
|
Return the number of new marker."""
|
|
|
if self._readonly:
|
|
|
raise error.Abort(
|
|
|
_(b'creating obsolete markers is not enabled on this repo')
|
|
|
)
|
|
|
known = set()
|
|
|
getsuccessors = self.successors.get
|
|
|
new = []
|
|
|
for m in markers:
|
|
|
if m not in getsuccessors(m[0], ()) and m not in known:
|
|
|
known.add(m)
|
|
|
new.append(m)
|
|
|
if new:
|
|
|
f = self.svfs(b'obsstore', b'ab')
|
|
|
try:
|
|
|
offset = f.tell()
|
|
|
transaction.add(b'obsstore', offset)
|
|
|
# offset == 0: new file - add the version header
|
|
|
data = b''.join(encodemarkers(new, offset == 0, self._version))
|
|
|
f.write(data)
|
|
|
finally:
|
|
|
# XXX: f.close() == filecache invalidation == obsstore rebuilt.
|
|
|
# call 'filecacheentry.refresh()' here
|
|
|
f.close()
|
|
|
addedmarkers = transaction.changes.get(b'obsmarkers')
|
|
|
if addedmarkers is not None:
|
|
|
addedmarkers.update(new)
|
|
|
self._addmarkers(new, data)
|
|
|
# new marker *may* have changed several set. invalidate the cache.
|
|
|
self.caches.clear()
|
|
|
# records the number of new markers for the transaction hooks
|
|
|
previous = int(transaction.hookargs.get(b'new_obsmarkers', b'0'))
|
|
|
transaction.hookargs[b'new_obsmarkers'] = b'%d' % (previous + len(new))
|
|
|
return len(new)
|
|
|
|
|
|
def mergemarkers(self, transaction, data):
|
|
|
"""merge a binary stream of markers inside the obsstore
|
|
|
|
|
|
Returns the number of new markers added."""
|
|
|
version, markers = _readmarkers(data)
|
|
|
return self.add(transaction, markers)
|
|
|
|
|
|
@propertycache
|
|
|
def _data(self):
|
|
|
return self.svfs.tryread(b'obsstore')
|
|
|
|
|
|
@propertycache
|
|
|
def _version(self):
|
|
|
if len(self._data) >= 1:
|
|
|
return _readmarkerversion(self._data)
|
|
|
else:
|
|
|
return self._defaultformat
|
|
|
|
|
|
@propertycache
|
|
|
def _all(self):
|
|
|
data = self._data
|
|
|
if not data:
|
|
|
return []
|
|
|
self._version, markers = _readmarkers(data)
|
|
|
markers = list(markers)
|
|
|
_checkinvalidmarkers(markers)
|
|
|
return markers
|
|
|
|
|
|
@propertycache
|
|
|
def successors(self):
|
|
|
successors = {}
|
|
|
_addsuccessors(successors, self._all)
|
|
|
return successors
|
|
|
|
|
|
@propertycache
|
|
|
def predecessors(self):
|
|
|
predecessors = {}
|
|
|
_addpredecessors(predecessors, self._all)
|
|
|
return predecessors
|
|
|
|
|
|
@propertycache
|
|
|
def children(self):
|
|
|
children = {}
|
|
|
_addchildren(children, self._all)
|
|
|
return children
|
|
|
|
|
|
def _cached(self, attr):
|
|
|
return attr in self.__dict__
|
|
|
|
|
|
def _addmarkers(self, markers, rawdata):
|
|
|
markers = list(markers) # to allow repeated iteration
|
|
|
self._data = self._data + rawdata
|
|
|
self._all.extend(markers)
|
|
|
if self._cached('successors'):
|
|
|
_addsuccessors(self.successors, markers)
|
|
|
if self._cached('predecessors'):
|
|
|
_addpredecessors(self.predecessors, markers)
|
|
|
if self._cached('children'):
|
|
|
_addchildren(self.children, markers)
|
|
|
_checkinvalidmarkers(markers)
|
|
|
|
|
|
def relevantmarkers(self, nodes):
|
|
|
"""return a set of all obsolescence markers relevant to a set of nodes.
|
|
|
|
|
|
"relevant" to a set of nodes mean:
|
|
|
|
|
|
- marker that use this changeset as successor
|
|
|
- prune marker of direct children on this changeset
|
|
|
- recursive application of the two rules on predecessors of these
|
|
|
markers
|
|
|
|
|
|
It is a set so you cannot rely on order."""
|
|
|
|
|
|
pendingnodes = set(nodes)
|
|
|
seenmarkers = set()
|
|
|
seennodes = set(pendingnodes)
|
|
|
precursorsmarkers = self.predecessors
|
|
|
succsmarkers = self.successors
|
|
|
children = self.children
|
|
|
while pendingnodes:
|
|
|
direct = set()
|
|
|
for current in pendingnodes:
|
|
|
direct.update(precursorsmarkers.get(current, ()))
|
|
|
pruned = [m for m in children.get(current, ()) if not m[1]]
|
|
|
direct.update(pruned)
|
|
|
pruned = [m for m in succsmarkers.get(current, ()) if not m[1]]
|
|
|
direct.update(pruned)
|
|
|
direct -= seenmarkers
|
|
|
pendingnodes = {m[0] for m in direct}
|
|
|
seenmarkers |= direct
|
|
|
pendingnodes -= seennodes
|
|
|
seennodes |= pendingnodes
|
|
|
return seenmarkers
|
|
|
|
|
|
|
|
|
def makestore(ui, repo):
|
|
|
"""Create an obsstore instance from a repo."""
|
|
|
# read default format for new obsstore.
|
|
|
# developer config: format.obsstore-version
|
|
|
defaultformat = ui.configint(b'format', b'obsstore-version')
|
|
|
# rely on obsstore class default when possible.
|
|
|
kwargs = {}
|
|
|
if defaultformat is not None:
|
|
|
kwargs['defaultformat'] = defaultformat
|
|
|
readonly = not isenabled(repo, createmarkersopt)
|
|
|
store = obsstore(repo.svfs, readonly=readonly, **kwargs)
|
|
|
if store and readonly:
|
|
|
ui.warn(
|
|
|
_(b'obsolete feature not enabled but %i markers found!\n')
|
|
|
% len(list(store))
|
|
|
)
|
|
|
return store
|
|
|
|
|
|
|
|
|
def commonversion(versions):
|
|
|
"""Return the newest version listed in both versions and our local formats.
|
|
|
|
|
|
Returns None if no common version exists.
|
|
|
"""
|
|
|
versions.sort(reverse=True)
|
|
|
# search for highest version known on both side
|
|
|
for v in versions:
|
|
|
if v in formats:
|
|
|
return v
|
|
|
return None
|
|
|
|
|
|
|
|
|
# arbitrary picked to fit into 8K limit from HTTP server
|
|
|
# you have to take in account:
|
|
|
# - the version header
|
|
|
# - the base85 encoding
|
|
|
_maxpayload = 5300
|
|
|
|
|
|
|
|
|
def _pushkeyescape(markers):
|
|
|
"""encode markers into a dict suitable for pushkey exchange
|
|
|
|
|
|
- binary data is base85 encoded
|
|
|
- split in chunks smaller than 5300 bytes"""
|
|
|
keys = {}
|
|
|
parts = []
|
|
|
currentlen = _maxpayload * 2 # ensure we create a new part
|
|
|
for marker in markers:
|
|
|
nextdata = _fm0encodeonemarker(marker)
|
|
|
if len(nextdata) + currentlen > _maxpayload:
|
|
|
currentpart = []
|
|
|
currentlen = 0
|
|
|
parts.append(currentpart)
|
|
|
currentpart.append(nextdata)
|
|
|
currentlen += len(nextdata)
|
|
|
for idx, part in enumerate(reversed(parts)):
|
|
|
data = b''.join([_pack(b'>B', _fm0version)] + part)
|
|
|
keys[b'dump%i' % idx] = util.b85encode(data)
|
|
|
return keys
|
|
|
|
|
|
|
|
|
def listmarkers(repo):
|
|
|
"""List markers over pushkey"""
|
|
|
if not repo.obsstore:
|
|
|
return {}
|
|
|
return _pushkeyescape(sorted(repo.obsstore))
|
|
|
|
|
|
|
|
|
def pushmarker(repo, key, old, new):
|
|
|
"""Push markers over pushkey"""
|
|
|
if not key.startswith(b'dump'):
|
|
|
repo.ui.warn(_(b'unknown key: %r') % key)
|
|
|
return False
|
|
|
if old:
|
|
|
repo.ui.warn(_(b'unexpected old value for %r') % key)
|
|
|
return False
|
|
|
data = util.b85decode(new)
|
|
|
with repo.lock(), repo.transaction(b'pushkey: obsolete markers') as tr:
|
|
|
repo.obsstore.mergemarkers(tr, data)
|
|
|
repo.invalidatevolatilesets()
|
|
|
return True
|
|
|
|
|
|
|
|
|
# mapping of 'set-name' -> <function to compute this set>
|
|
|
cachefuncs = {}
|
|
|
|
|
|
|
|
|
def cachefor(name):
|
|
|
"""Decorator to register a function as computing the cache for a set"""
|
|
|
|
|
|
def decorator(func):
|
|
|
if name in cachefuncs:
|
|
|
msg = b"duplicated registration for volatileset '%s' (existing: %r)"
|
|
|
raise error.ProgrammingError(msg % (name, cachefuncs[name]))
|
|
|
cachefuncs[name] = func
|
|
|
return func
|
|
|
|
|
|
return decorator
|
|
|
|
|
|
|
|
|
def getrevs(repo, name):
|
|
|
"""Return the set of revision that belong to the <name> set
|
|
|
|
|
|
Such access may compute the set and cache it for future use"""
|
|
|
repo = repo.unfiltered()
|
|
|
with util.timedcm('getrevs %s', name):
|
|
|
if not repo.obsstore:
|
|
|
return frozenset()
|
|
|
if name not in repo.obsstore.caches:
|
|
|
repo.obsstore.caches[name] = cachefuncs[name](repo)
|
|
|
return repo.obsstore.caches[name]
|
|
|
|
|
|
|
|
|
# To be simple we need to invalidate obsolescence cache when:
|
|
|
#
|
|
|
# - new changeset is added:
|
|
|
# - public phase is changed
|
|
|
# - obsolescence marker are added
|
|
|
# - strip is used a repo
|
|
|
def clearobscaches(repo):
|
|
|
"""Remove all obsolescence related cache from a repo
|
|
|
|
|
|
This remove all cache in obsstore is the obsstore already exist on the
|
|
|
repo.
|
|
|
|
|
|
(We could be smarter here given the exact event that trigger the cache
|
|
|
clearing)"""
|
|
|
# only clear cache is there is obsstore data in this repo
|
|
|
if b'obsstore' in repo._filecache:
|
|
|
repo.obsstore.caches.clear()
|
|
|
|
|
|
|
|
|
def _mutablerevs(repo):
|
|
|
"""the set of mutable revision in the repository"""
|
|
|
return repo._phasecache.getrevset(repo, phases.mutablephases)
|
|
|
|
|
|
|
|
|
@cachefor(b'obsolete')
|
|
|
def _computeobsoleteset(repo):
|
|
|
"""the set of obsolete revisions"""
|
|
|
getnode = repo.changelog.node
|
|
|
notpublic = _mutablerevs(repo)
|
|
|
isobs = repo.obsstore.successors.__contains__
|
|
|
obs = {r for r in notpublic if isobs(getnode(r))}
|
|
|
return obs
|
|
|
|
|
|
|
|
|
@cachefor(b'orphan')
|
|
|
def _computeorphanset(repo):
|
|
|
"""the set of non obsolete revisions with obsolete parents"""
|
|
|
pfunc = repo.changelog.parentrevs
|
|
|
mutable = _mutablerevs(repo)
|
|
|
obsolete = getrevs(repo, b'obsolete')
|
|
|
others = mutable - obsolete
|
|
|
unstable = set()
|
|
|
for r in sorted(others):
|
|
|
# A rev is unstable if one of its parent is obsolete or unstable
|
|
|
# this works since we traverse following growing rev order
|
|
|
for p in pfunc(r):
|
|
|
if p in obsolete or p in unstable:
|
|
|
unstable.add(r)
|
|
|
break
|
|
|
return unstable
|
|
|
|
|
|
|
|
|
@cachefor(b'suspended')
|
|
|
def _computesuspendedset(repo):
|
|
|
"""the set of obsolete parents with non obsolete descendants"""
|
|
|
suspended = repo.changelog.ancestors(getrevs(repo, b'orphan'))
|
|
|
return {r for r in getrevs(repo, b'obsolete') if r in suspended}
|
|
|
|
|
|
|
|
|
@cachefor(b'extinct')
|
|
|
def _computeextinctset(repo):
|
|
|
"""the set of obsolete parents without non obsolete descendants"""
|
|
|
return getrevs(repo, b'obsolete') - getrevs(repo, b'suspended')
|
|
|
|
|
|
|
|
|
@cachefor(b'phasedivergent')
|
|
|
def _computephasedivergentset(repo):
|
|
|
"""the set of revs trying to obsolete public revisions"""
|
|
|
bumped = set()
|
|
|
# util function (avoid attribute lookup in the loop)
|
|
|
phase = repo._phasecache.phase # would be faster to grab the full list
|
|
|
public = phases.public
|
|
|
cl = repo.changelog
|
|
|
torev = cl.index.get_rev
|
|
|
tonode = cl.node
|
|
|
obsstore = repo.obsstore
|
|
|
for rev in repo.revs(b'(not public()) and (not obsolete())'):
|
|
|
# We only evaluate mutable, non-obsolete revision
|
|
|
node = tonode(rev)
|
|
|
# (future) A cache of predecessors may worth if split is very common
|
|
|
for pnode in obsutil.allpredecessors(
|
|
|
obsstore, [node], ignoreflags=bumpedfix
|
|
|
):
|
|
|
prev = torev(pnode) # unfiltered! but so is phasecache
|
|
|
if (prev is not None) and (phase(repo, prev) <= public):
|
|
|
# we have a public predecessor
|
|
|
bumped.add(rev)
|
|
|
break # Next draft!
|
|
|
return bumped
|
|
|
|
|
|
|
|
|
@cachefor(b'contentdivergent')
|
|
|
def _computecontentdivergentset(repo):
|
|
|
"""the set of rev that compete to be the final successors of some revision."""
|
|
|
divergent = set()
|
|
|
obsstore = repo.obsstore
|
|
|
newermap = {}
|
|
|
tonode = repo.changelog.node
|
|
|
for rev in repo.revs(b'(not public()) - obsolete()'):
|
|
|
node = tonode(rev)
|
|
|
mark = obsstore.predecessors.get(node, ())
|
|
|
toprocess = set(mark)
|
|
|
seen = set()
|
|
|
while toprocess:
|
|
|
prec = toprocess.pop()[0]
|
|
|
if prec in seen:
|
|
|
continue # emergency cycle hanging prevention
|
|
|
seen.add(prec)
|
|
|
if prec not in newermap:
|
|
|
obsutil.successorssets(repo, prec, cache=newermap)
|
|
|
newer = [n for n in newermap[prec] if n]
|
|
|
if len(newer) > 1:
|
|
|
divergent.add(rev)
|
|
|
break
|
|
|
toprocess.update(obsstore.predecessors.get(prec, ()))
|
|
|
return divergent
|
|
|
|
|
|
|
|
|
def makefoldid(relation, user):
|
|
|
|
|
|
folddigest = hashutil.sha1(user)
|
|
|
for p in relation[0] + relation[1]:
|
|
|
folddigest.update(b'%d' % p.rev())
|
|
|
folddigest.update(p.node())
|
|
|
# Since fold only has to compete against fold for the same successors, it
|
|
|
# seems fine to use a small ID. Smaller ID save space.
|
|
|
return hex(folddigest.digest())[:8]
|
|
|
|
|
|
|
|
|
def createmarkers(
|
|
|
repo, relations, flag=0, date=None, metadata=None, operation=None
|
|
|
):
|
|
|
"""Add obsolete markers between changesets in a repo
|
|
|
|
|
|
<relations> must be an iterable of ((<old>,...), (<new>, ...)[,{metadata}])
|
|
|
tuple. `old` and `news` are changectx. metadata is an optional dictionary
|
|
|
containing metadata for this marker only. It is merged with the global
|
|
|
metadata specified through the `metadata` argument of this function.
|
|
|
Any string values in metadata must be UTF-8 bytes.
|
|
|
|
|
|
Trying to obsolete a public changeset will raise an exception.
|
|
|
|
|
|
Current user and date are used except if specified otherwise in the
|
|
|
metadata attribute.
|
|
|
|
|
|
This function operates within a transaction of its own, but does
|
|
|
not take any lock on the repo.
|
|
|
"""
|
|
|
# prepare metadata
|
|
|
if metadata is None:
|
|
|
metadata = {}
|
|
|
if b'user' not in metadata:
|
|
|
luser = (
|
|
|
repo.ui.config(b'devel', b'user.obsmarker') or repo.ui.username()
|
|
|
)
|
|
|
metadata[b'user'] = encoding.fromlocal(luser)
|
|
|
|
|
|
# Operation metadata handling
|
|
|
useoperation = repo.ui.configbool(
|
|
|
b'experimental', b'evolution.track-operation'
|
|
|
)
|
|
|
if useoperation and operation:
|
|
|
metadata[b'operation'] = operation
|
|
|
|
|
|
# Effect flag metadata handling
|
|
|
saveeffectflag = repo.ui.configbool(
|
|
|
b'experimental', b'evolution.effect-flags'
|
|
|
)
|
|
|
|
|
|
with repo.transaction(b'add-obsolescence-marker') as tr:
|
|
|
markerargs = []
|
|
|
for rel in relations:
|
|
|
predecessors = rel[0]
|
|
|
if not isinstance(predecessors, tuple):
|
|
|
# preserve compat with old API until all caller are migrated
|
|
|
predecessors = (predecessors,)
|
|
|
if len(predecessors) > 1 and len(rel[1]) != 1:
|
|
|
msg = b'Fold markers can only have 1 successors, not %d'
|
|
|
raise error.ProgrammingError(msg % len(rel[1]))
|
|
|
foldid = None
|
|
|
foldsize = len(predecessors)
|
|
|
if 1 < foldsize:
|
|
|
foldid = makefoldid(rel, metadata[b'user'])
|
|
|
for foldidx, prec in enumerate(predecessors, 1):
|
|
|
sucs = rel[1]
|
|
|
localmetadata = metadata.copy()
|
|
|
if len(rel) > 2:
|
|
|
localmetadata.update(rel[2])
|
|
|
if foldid is not None:
|
|
|
localmetadata[b'fold-id'] = foldid
|
|
|
localmetadata[b'fold-idx'] = b'%d' % foldidx
|
|
|
localmetadata[b'fold-size'] = b'%d' % foldsize
|
|
|
|
|
|
if not prec.mutable():
|
|
|
raise error.Abort(
|
|
|
_(b"cannot obsolete public changeset: %s") % prec,
|
|
|
hint=b"see 'hg help phases' for details",
|
|
|
)
|
|
|
nprec = prec.node()
|
|
|
nsucs = tuple(s.node() for s in sucs)
|
|
|
npare = None
|
|
|
if not nsucs:
|
|
|
npare = tuple(p.node() for p in prec.parents())
|
|
|
if nprec in nsucs:
|
|
|
raise error.Abort(
|
|
|
_(b"changeset %s cannot obsolete itself") % prec
|
|
|
)
|
|
|
|
|
|
# Effect flag can be different by relation
|
|
|
if saveeffectflag:
|
|
|
# The effect flag is saved in a versioned field name for
|
|
|
# future evolution
|
|
|
effectflag = obsutil.geteffectflag(prec, sucs)
|
|
|
localmetadata[obsutil.EFFECTFLAGFIELD] = b"%d" % effectflag
|
|
|
|
|
|
# Creating the marker causes the hidden cache to become
|
|
|
# invalid, which causes recomputation when we ask for
|
|
|
# prec.parents() above. Resulting in n^2 behavior. So let's
|
|
|
# prepare all of the args first, then create the markers.
|
|
|
markerargs.append((nprec, nsucs, npare, localmetadata))
|
|
|
|
|
|
for args in markerargs:
|
|
|
nprec, nsucs, npare, localmetadata = args
|
|
|
repo.obsstore.create(
|
|
|
tr,
|
|
|
nprec,
|
|
|
nsucs,
|
|
|
flag,
|
|
|
parents=npare,
|
|
|
date=date,
|
|
|
metadata=localmetadata,
|
|
|
ui=repo.ui,
|
|
|
)
|
|
|
repo.filteredrevcache.clear()
|
|
|
|
