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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 "precursor" and possible
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replacements are called "successors". Markers that used changeset X as
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a precursor 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 "precursor markers of Y" because they hold
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information about the precursors 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 are used:
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(A, (C, 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 . import (
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base85,
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error,
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node,
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parsers,
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phases,
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util,
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)
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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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# the obsolete feature is not mature enough to be enabled by default.
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# you have to rely on third party extension extension to enable this.
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_enabled = False
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# Options for obsolescence
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createmarkersopt = 'createmarkers'
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allowunstableopt = 'allowunstable'
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exchangeopt = 'exchange'
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### obsolescence marker flag
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## bumpedfix flag
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#
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# When a changeset A' succeed to a changeset A which became public, we call A'
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# "bumped" because it's a successors of a public changesets
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#
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# o A' (bumped)
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# |`:
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# | o A
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# |/
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# o Z
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#
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# The way to solve this situation is to create a new changeset Ad as children
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# of A. This changeset have the same content than A'. So the diff from A to A'
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# is the same than the diff from A to Ad. Ad is marked as a successors of A'
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#
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# o Ad
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# |`:
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# | x A'
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# |'|
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# o | A
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# |/
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# o Z
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#
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# But by transitivity Ad is also a successors of A. To avoid having Ad marked
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# as bumped too, we add the `bumpedfix` flag to the marker. <A', (Ad,)>.
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# This flag mean that the successors express the changes between the public and
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# bumped version and fix the situation, breaking the transitivity of
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# "bumped" here.
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bumpedfix = 1
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usingsha256 = 2
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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 = '>BIB20s'
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_fm0node = '20s'
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_fm0fsize = _calcsize(_fm0fixed)
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_fm0fnodesize = _calcsize(_fm0node)
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def _fm0readmarkers(data, off):
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# Loop on markers
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l = len(data)
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while off + _fm0fsize <= l:
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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(_('parsing obsolete marker: metadata is too '
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'short, %d bytes expected, got %d')
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% (mdsize, len(metadata)))
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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('date', '0 0').split(' ')
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date = float(when), int(offset)
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except ValueError:
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date = (0., 0)
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parents = None
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if 'p2' in metadata:
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parents = (metadata.pop('p1', None), metadata.pop('p2', None))
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elif 'p1' in metadata:
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parents = (metadata.pop('p1', None),)
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elif '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(node.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(metadata.iteritems()))
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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(_('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['date'] = '%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['p0'] = ''
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for i, p in enumerate(parents):
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metadata['p%i' % (i + 1)] = node.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 meta.iteritems():
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if ':' in key or '\0' in key:
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raise ValueError("':' and '\0' are forbidden in metadata key'")
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if '\0' in value:
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raise ValueError("':' is forbidden in metadata value'")
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return '\0'.join(['%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('\0'):
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if l:
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key, value = l.split(':')
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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: precursor 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 precursors 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 = '>IdhHBBB20s'
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_fm1nodesha1 = '20s'
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_fm1nodesha256 = '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 = 'BB'
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_fm1metapairsize = _calcsize('BB')
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def _fm1purereadmarkers(data, off):
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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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stop = len(data) - _fm1fsize
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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, prec = ufixed(data[off:o1])
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if flags & sha2flag:
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# FIXME: prec was read as a SHA1, needs to be amended
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# read 0 or more successors
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if numsuc == 1:
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o2 = o1 + sha2size
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sucs = (data[o1:o2],)
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else:
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o2 = o1 + sha2size * numsuc
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sucs = unpack(sha2fmt * 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 + sha2size
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parents = (data[o2:o3],)
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else:
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o3 = o2 + sha2size * numpar
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parents = unpack(sha2fmt * numpar, data[o2:o3])
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else:
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# read 0 or more successors
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if numsuc == 1:
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o2 = o1 + sha1size
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sucs = (data[o1:o2],)
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else:
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o2 = o1 + sha1size * numsuc
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sucs = unpack(sha1fmt * 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 + sha1size
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parents = (data[o2:o3],)
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else:
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o3 = o2 + sha1size * numpar
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parents = unpack(sha1fmt * numpar, data[o2:o3])
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# read metadata
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off = o3 + metasize * nummeta
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metapairsize = unpack('>' + (metafmt * nummeta), data[o3:off])
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metadata = []
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for idx in 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 = 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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data.append(lk)
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data.append(lv)
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totalsize += lk + lv
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data[0] = totalsize
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data = [_pack(format, *data)]
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for key, value in metadata:
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data.append(key)
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data.append(value)
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return ''.join(data)
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def _fm1readmarkers(data, off):
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native = getattr(parsers, 'fm1readmarkers', None)
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if not native:
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return _fm1purereadmarkers(data, off)
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stop = len(data) - _fm1fsize
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return native(data, off, stop)
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# mapping to read/write various marker formats
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# <version> -> (decoder, encoder)
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formats = {_fm0version: (_fm0readmarkers, _fm0encodeonemarker),
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_fm1version: (_fm1readmarkers, _fm1encodeonemarker)}
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@util.nogc
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def _readmarkers(data):
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"""Read and enumerate markers from raw data"""
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off = 0
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diskversion = _unpack('>B', data[off:off + 1])[0]
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off += 1
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if diskversion not in formats:
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raise error.Abort(_('parsing obsolete marker: unknown version %r')
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% diskversion)
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return diskversion, formats[diskversion][0](data, off)
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def encodemarkers(markers, addheader=False, version=_fm0version):
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|
|
# Kept separate from flushmarkers(), it will be reused for
|
|
|
# markers exchange.
|
|
|
encodeone = formats[version][1]
|
|
|
if addheader:
|
|
|
yield _pack('>B', version)
|
|
|
for marker in markers:
|
|
|
yield encodeone(marker)
|
|
|
|
|
|
|
|
|
class marker(object):
|
|
|
"""Wrap obsolete marker raw data"""
|
|
|
|
|
|
def __init__(self, repo, data):
|
|
|
# the repo argument will be used to create changectx in later version
|
|
|
self._repo = repo
|
|
|
self._data = data
|
|
|
self._decodedmeta = None
|
|
|
|
|
|
def __hash__(self):
|
|
|
return hash(self._data)
|
|
|
|
|
|
def __eq__(self, other):
|
|
|
if type(other) != type(self):
|
|
|
return False
|
|
|
return self._data == other._data
|
|
|
|
|
|
def precnode(self):
|
|
|
"""Precursor changeset node identifier"""
|
|
|
return self._data[0]
|
|
|
|
|
|
def succnodes(self):
|
|
|
"""List of successor changesets node identifiers"""
|
|
|
return self._data[1]
|
|
|
|
|
|
def parentnodes(self):
|
|
|
"""Parents of the precursors (None if not recorded)"""
|
|
|
return self._data[5]
|
|
|
|
|
|
def metadata(self):
|
|
|
"""Decoded metadata dictionary"""
|
|
|
return dict(self._data[3])
|
|
|
|
|
|
def date(self):
|
|
|
"""Creation date as (unixtime, offset)"""
|
|
|
return self._data[4]
|
|
|
|
|
|
def flags(self):
|
|
|
"""The flags field of the marker"""
|
|
|
return self._data[2]
|
|
|
|
|
|
@util.nogc
|
|
|
def _addsuccessors(successors, markers):
|
|
|
for mark in markers:
|
|
|
successors.setdefault(mark[0], set()).add(mark)
|
|
|
|
|
|
@util.nogc
|
|
|
def _addprecursors(precursors, markers):
|
|
|
for mark in markers:
|
|
|
for suc in mark[1]:
|
|
|
precursors.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 node.nullid in mark[1]:
|
|
|
raise error.Abort(_('bad obsolescence marker detected: '
|
|
|
'invalid successors nullid'))
|
|
|
|
|
|
class obsstore(object):
|
|
|
"""Store obsolete markers
|
|
|
|
|
|
Markers can be accessed with two mappings:
|
|
|
- precursors[x] -> set(markers on precursors edges of x)
|
|
|
- successors[x] -> set(markers on successors edges of x)
|
|
|
- children[x] -> set(markers on precursors edges of children(x)
|
|
|
"""
|
|
|
|
|
|
fields = ('prec', 'succs', 'flag', 'meta', 'date', 'parents')
|
|
|
# prec: nodeid, precursor changesets
|
|
|
# succs: tuple of nodeid, successor changesets (0-N length)
|
|
|
# flag: integer, flag field carrying modifier for the markers (see doc)
|
|
|
# meta: binary blob, encoded metadata dictionary
|
|
|
# date: (float, int) tuple, date of marker creation
|
|
|
# parents: (tuple of nodeid) or None, parents of precursors
|
|
|
# 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._version = 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('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
|
|
|
pass
|
|
|
return bool(self._all)
|
|
|
|
|
|
@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):
|
|
|
"""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).
|
|
|
"""
|
|
|
if metadata is None:
|
|
|
metadata = {}
|
|
|
if date is None:
|
|
|
if 'date' in metadata:
|
|
|
# as a courtesy for out-of-tree extensions
|
|
|
date = util.parsedate(metadata.pop('date'))
|
|
|
else:
|
|
|
date = util.makedate()
|
|
|
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') % node.hex(prec))
|
|
|
|
|
|
metadata = tuple(sorted(metadata.iteritems()))
|
|
|
|
|
|
marker = (str(prec), tuple(succs), int(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(_('creating obsolete markers is not enabled on '
|
|
|
'this repo'))
|
|
|
known = set(self._all)
|
|
|
new = []
|
|
|
for m in markers:
|
|
|
if m not in known:
|
|
|
known.add(m)
|
|
|
new.append(m)
|
|
|
if new:
|
|
|
f = self.svfs('obsstore', 'ab')
|
|
|
try:
|
|
|
offset = f.tell()
|
|
|
transaction.add('obsstore', offset)
|
|
|
# offset == 0: new file - add the version header
|
|
|
for bytes in encodemarkers(new, offset == 0, self._version):
|
|
|
f.write(bytes)
|
|
|
finally:
|
|
|
# XXX: f.close() == filecache invalidation == obsstore rebuilt.
|
|
|
# call 'filecacheentry.refresh()' here
|
|
|
f.close()
|
|
|
self._addmarkers(new)
|
|
|
# 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('new_obsmarkers', '0'))
|
|
|
transaction.hookargs['new_obsmarkers'] = str(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 _all(self):
|
|
|
data = self.svfs.tryread('obsstore')
|
|
|
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 precursors(self):
|
|
|
precursors = {}
|
|
|
_addprecursors(precursors, self._all)
|
|
|
return precursors
|
|
|
|
|
|
@propertycache
|
|
|
def children(self):
|
|
|
children = {}
|
|
|
_addchildren(children, self._all)
|
|
|
return children
|
|
|
|
|
|
def _cached(self, attr):
|
|
|
return attr in self.__dict__
|
|
|
|
|
|
def _addmarkers(self, markers):
|
|
|
markers = list(markers) # to allow repeated iteration
|
|
|
self._all.extend(markers)
|
|
|
if self._cached('successors'):
|
|
|
_addsuccessors(self.successors, markers)
|
|
|
if self._cached('precursors'):
|
|
|
_addprecursors(self.precursors, 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 precursors of these markers
|
|
|
|
|
|
It is a set so you cannot rely on order."""
|
|
|
|
|
|
pendingnodes = set(nodes)
|
|
|
seenmarkers = set()
|
|
|
seennodes = set(pendingnodes)
|
|
|
precursorsmarkers = self.precursors
|
|
|
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)
|
|
|
direct -= seenmarkers
|
|
|
pendingnodes = set([m[0] for m in direct])
|
|
|
seenmarkers |= direct
|
|
|
pendingnodes -= seennodes
|
|
|
seennodes |= pendingnodes
|
|
|
return seenmarkers
|
|
|
|
|
|
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 = ''.join([_pack('>B', _fm0version)] + part)
|
|
|
keys['dump%i' % idx] = base85.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('dump'):
|
|
|
repo.ui.warn(_('unknown key: %r') % key)
|
|
|
return 0
|
|
|
if old:
|
|
|
repo.ui.warn(_('unexpected old value for %r') % key)
|
|
|
return 0
|
|
|
data = base85.b85decode(new)
|
|
|
lock = repo.lock()
|
|
|
try:
|
|
|
tr = repo.transaction('pushkey: obsolete markers')
|
|
|
try:
|
|
|
repo.obsstore.mergemarkers(tr, data)
|
|
|
tr.close()
|
|
|
return 1
|
|
|
finally:
|
|
|
tr.release()
|
|
|
finally:
|
|
|
lock.release()
|
|
|
|
|
|
def getmarkers(repo, nodes=None):
|
|
|
"""returns markers known in a repository
|
|
|
|
|
|
If <nodes> is specified, only markers "relevant" to those nodes are are
|
|
|
returned"""
|
|
|
if nodes is None:
|
|
|
rawmarkers = repo.obsstore
|
|
|
else:
|
|
|
rawmarkers = repo.obsstore.relevantmarkers(nodes)
|
|
|
|
|
|
for markerdata in rawmarkers:
|
|
|
yield marker(repo, markerdata)
|
|
|
|
|
|
def relevantmarkers(repo, node):
|
|
|
"""all obsolete markers relevant to some revision"""
|
|
|
for markerdata in repo.obsstore.relevantmarkers(node):
|
|
|
yield marker(repo, markerdata)
|
|
|
|
|
|
|
|
|
def precursormarkers(ctx):
|
|
|
"""obsolete marker marking this changeset as a successors"""
|
|
|
for data in ctx.repo().obsstore.precursors.get(ctx.node(), ()):
|
|
|
yield marker(ctx.repo(), data)
|
|
|
|
|
|
def successormarkers(ctx):
|
|
|
"""obsolete marker making this changeset obsolete"""
|
|
|
for data in ctx.repo().obsstore.successors.get(ctx.node(), ()):
|
|
|
yield marker(ctx.repo(), data)
|
|
|
|
|
|
def allsuccessors(obsstore, nodes, ignoreflags=0):
|
|
|
"""Yield node for every successor of <nodes>.
|
|
|
|
|
|
Some successors may be unknown locally.
|
|
|
|
|
|
This is a linear yield unsuited to detecting split changesets. It includes
|
|
|
initial nodes too."""
|
|
|
remaining = set(nodes)
|
|
|
seen = set(remaining)
|
|
|
while remaining:
|
|
|
current = remaining.pop()
|
|
|
yield current
|
|
|
for mark in obsstore.successors.get(current, ()):
|
|
|
# ignore marker flagged with specified flag
|
|
|
if mark[2] & ignoreflags:
|
|
|
continue
|
|
|
for suc in mark[1]:
|
|
|
if suc not in seen:
|
|
|
seen.add(suc)
|
|
|
remaining.add(suc)
|
|
|
|
|
|
def allprecursors(obsstore, nodes, ignoreflags=0):
|
|
|
"""Yield node for every precursors of <nodes>.
|
|
|
|
|
|
Some precursors may be unknown locally.
|
|
|
|
|
|
This is a linear yield unsuited to detecting folded changesets. It includes
|
|
|
initial nodes too."""
|
|
|
|
|
|
remaining = set(nodes)
|
|
|
seen = set(remaining)
|
|
|
while remaining:
|
|
|
current = remaining.pop()
|
|
|
yield current
|
|
|
for mark in obsstore.precursors.get(current, ()):
|
|
|
# ignore marker flagged with specified flag
|
|
|
if mark[2] & ignoreflags:
|
|
|
continue
|
|
|
suc = mark[0]
|
|
|
if suc not in seen:
|
|
|
seen.add(suc)
|
|
|
remaining.add(suc)
|
|
|
|
|
|
def foreground(repo, nodes):
|
|
|
"""return all nodes in the "foreground" of other node
|
|
|
|
|
|
The foreground of a revision is anything reachable using parent -> children
|
|
|
or precursor -> successor relation. It is very similar to "descendant" but
|
|
|
augmented with obsolescence information.
|
|
|
|
|
|
Beware that possible obsolescence cycle may result if complex situation.
|
|
|
"""
|
|
|
repo = repo.unfiltered()
|
|
|
foreground = set(repo.set('%ln::', nodes))
|
|
|
if repo.obsstore:
|
|
|
# We only need this complicated logic if there is obsolescence
|
|
|
# XXX will probably deserve an optimised revset.
|
|
|
nm = repo.changelog.nodemap
|
|
|
plen = -1
|
|
|
# compute the whole set of successors or descendants
|
|
|
while len(foreground) != plen:
|
|
|
plen = len(foreground)
|
|
|
succs = set(c.node() for c in foreground)
|
|
|
mutable = [c.node() for c in foreground if c.mutable()]
|
|
|
succs.update(allsuccessors(repo.obsstore, mutable))
|
|
|
known = (n for n in succs if n in nm)
|
|
|
foreground = set(repo.set('%ln::', known))
|
|
|
return set(c.node() for c in foreground)
|
|
|
|
|
|
|
|
|
def successorssets(repo, initialnode, cache=None):
|
|
|
"""Return set of all latest successors of initial nodes
|
|
|
|
|
|
The successors set of a changeset A are the group of revisions that succeed
|
|
|
A. It succeeds A as a consistent whole, each revision being only a partial
|
|
|
replacement. The successors set contains non-obsolete changesets only.
|
|
|
|
|
|
This function returns the full list of successor sets which is why it
|
|
|
returns a list of tuples and not just a single tuple. Each tuple is a valid
|
|
|
successors set. Note that (A,) may be a valid successors set for changeset A
|
|
|
(see below).
|
|
|
|
|
|
In most cases, a changeset A will have a single element (e.g. the changeset
|
|
|
A is replaced by A') in its successors set. Though, it is also common for a
|
|
|
changeset A to have no elements in its successor set (e.g. the changeset
|
|
|
has been pruned). Therefore, the returned list of successors sets will be
|
|
|
[(A',)] or [], respectively.
|
|
|
|
|
|
When a changeset A is split into A' and B', however, it will result in a
|
|
|
successors set containing more than a single element, i.e. [(A',B')].
|
|
|
Divergent changesets will result in multiple successors sets, i.e. [(A',),
|
|
|
(A'')].
|
|
|
|
|
|
If a changeset A is not obsolete, then it will conceptually have no
|
|
|
successors set. To distinguish this from a pruned changeset, the successor
|
|
|
set will contain itself only, i.e. [(A,)].
|
|
|
|
|
|
Finally, successors unknown locally are considered to be pruned (obsoleted
|
|
|
without any successors).
|
|
|
|
|
|
The optional `cache` parameter is a dictionary that may contain precomputed
|
|
|
successors sets. It is meant to reuse the computation of a previous call to
|
|
|
`successorssets` when multiple calls are made at the same time. The cache
|
|
|
dictionary is updated in place. The caller is responsible for its life
|
|
|
span. Code that makes multiple calls to `successorssets` *must* use this
|
|
|
cache mechanism or suffer terrible performance.
|
|
|
"""
|
|
|
|
|
|
succmarkers = repo.obsstore.successors
|
|
|
|
|
|
# Stack of nodes we search successors sets for
|
|
|
toproceed = [initialnode]
|
|
|
# set version of above list for fast loop detection
|
|
|
# element added to "toproceed" must be added here
|
|
|
stackedset = set(toproceed)
|
|
|
if cache is None:
|
|
|
cache = {}
|
|
|
|
|
|
# This while loop is the flattened version of a recursive search for
|
|
|
# successors sets
|
|
|
#
|
|
|
# def successorssets(x):
|
|
|
# successors = directsuccessors(x)
|
|
|
# ss = [[]]
|
|
|
# for succ in directsuccessors(x):
|
|
|
# # product as in itertools cartesian product
|
|
|
# ss = product(ss, successorssets(succ))
|
|
|
# return ss
|
|
|
#
|
|
|
# But we can not use plain recursive calls here:
|
|
|
# - that would blow the python call stack
|
|
|
# - obsolescence markers may have cycles, we need to handle them.
|
|
|
#
|
|
|
# The `toproceed` list act as our call stack. Every node we search
|
|
|
# successors set for are stacked there.
|
|
|
#
|
|
|
# The `stackedset` is set version of this stack used to check if a node is
|
|
|
# already stacked. This check is used to detect cycles and prevent infinite
|
|
|
# loop.
|
|
|
#
|
|
|
# successors set of all nodes are stored in the `cache` dictionary.
|
|
|
#
|
|
|
# After this while loop ends we use the cache to return the successors sets
|
|
|
# for the node requested by the caller.
|
|
|
while toproceed:
|
|
|
# Every iteration tries to compute the successors sets of the topmost
|
|
|
# node of the stack: CURRENT.
|
|
|
#
|
|
|
# There are four possible outcomes:
|
|
|
#
|
|
|
# 1) We already know the successors sets of CURRENT:
|
|
|
# -> mission accomplished, pop it from the stack.
|
|
|
# 2) Node is not obsolete:
|
|
|
# -> the node is its own successors sets. Add it to the cache.
|
|
|
# 3) We do not know successors set of direct successors of CURRENT:
|
|
|
# -> We add those successors to the stack.
|
|
|
# 4) We know successors sets of all direct successors of CURRENT:
|
|
|
# -> We can compute CURRENT successors set and add it to the
|
|
|
# cache.
|
|
|
#
|
|
|
current = toproceed[-1]
|
|
|
if current in cache:
|
|
|
# case (1): We already know the successors sets
|
|
|
stackedset.remove(toproceed.pop())
|
|
|
elif current not in succmarkers:
|
|
|
# case (2): The node is not obsolete.
|
|
|
if current in repo:
|
|
|
# We have a valid last successors.
|
|
|
cache[current] = [(current,)]
|
|
|
else:
|
|
|
# Final obsolete version is unknown locally.
|
|
|
# Do not count that as a valid successors
|
|
|
cache[current] = []
|
|
|
else:
|
|
|
# cases (3) and (4)
|
|
|
#
|
|
|
# We proceed in two phases. Phase 1 aims to distinguish case (3)
|
|
|
# from case (4):
|
|
|
#
|
|
|
# For each direct successors of CURRENT, we check whether its
|
|
|
# successors sets are known. If they are not, we stack the
|
|
|
# unknown node and proceed to the next iteration of the while
|
|
|
# loop. (case 3)
|
|
|
#
|
|
|
# During this step, we may detect obsolescence cycles: a node
|
|
|
# with unknown successors sets but already in the call stack.
|
|
|
# In such a situation, we arbitrary set the successors sets of
|
|
|
# the node to nothing (node pruned) to break the cycle.
|
|
|
#
|
|
|
# If no break was encountered we proceed to phase 2.
|
|
|
#
|
|
|
# Phase 2 computes successors sets of CURRENT (case 4); see details
|
|
|
# in phase 2 itself.
|
|
|
#
|
|
|
# Note the two levels of iteration in each phase.
|
|
|
# - The first one handles obsolescence markers using CURRENT as
|
|
|
# precursor (successors markers of CURRENT).
|
|
|
#
|
|
|
# Having multiple entry here means divergence.
|
|
|
#
|
|
|
# - The second one handles successors defined in each marker.
|
|
|
#
|
|
|
# Having none means pruned node, multiple successors means split,
|
|
|
# single successors are standard replacement.
|
|
|
#
|
|
|
for mark in sorted(succmarkers[current]):
|
|
|
for suc in mark[1]:
|
|
|
if suc not in cache:
|
|
|
if suc in stackedset:
|
|
|
# cycle breaking
|
|
|
cache[suc] = []
|
|
|
else:
|
|
|
# case (3) If we have not computed successors sets
|
|
|
# of one of those successors we add it to the
|
|
|
# `toproceed` stack and stop all work for this
|
|
|
# iteration.
|
|
|
toproceed.append(suc)
|
|
|
stackedset.add(suc)
|
|
|
break
|
|
|
else:
|
|
|
continue
|
|
|
break
|
|
|
else:
|
|
|
# case (4): we know all successors sets of all direct
|
|
|
# successors
|
|
|
#
|
|
|
# Successors set contributed by each marker depends on the
|
|
|
# successors sets of all its "successors" node.
|
|
|
#
|
|
|
# Each different marker is a divergence in the obsolescence
|
|
|
# history. It contributes successors sets distinct from other
|
|
|
# markers.
|
|
|
#
|
|
|
# Within a marker, a successor may have divergent successors
|
|
|
# sets. In such a case, the marker will contribute multiple
|
|
|
# divergent successors sets. If multiple successors have
|
|
|
# divergent successors sets, a Cartesian product is used.
|
|
|
#
|
|
|
# At the end we post-process successors sets to remove
|
|
|
# duplicated entry and successors set that are strict subset of
|
|
|
# another one.
|
|
|
succssets = []
|
|
|
for mark in sorted(succmarkers[current]):
|
|
|
# successors sets contributed by this marker
|
|
|
markss = [[]]
|
|
|
for suc in mark[1]:
|
|
|
# cardinal product with previous successors
|
|
|
productresult = []
|
|
|
for prefix in markss:
|
|
|
for suffix in cache[suc]:
|
|
|
newss = list(prefix)
|
|
|
for part in suffix:
|
|
|
# do not duplicated entry in successors set
|
|
|
# first entry wins.
|
|
|
if part not in newss:
|
|
|
newss.append(part)
|
|
|
productresult.append(newss)
|
|
|
markss = productresult
|
|
|
succssets.extend(markss)
|
|
|
# remove duplicated and subset
|
|
|
seen = []
|
|
|
final = []
|
|
|
candidate = sorted(((set(s), s) for s in succssets if s),
|
|
|
key=lambda x: len(x[1]), reverse=True)
|
|
|
for setversion, listversion in candidate:
|
|
|
for seenset in seen:
|
|
|
if setversion.issubset(seenset):
|
|
|
break
|
|
|
else:
|
|
|
final.append(listversion)
|
|
|
seen.append(setversion)
|
|
|
final.reverse() # put small successors set first
|
|
|
cache[current] = final
|
|
|
return cache[initialnode]
|
|
|
|
|
|
# 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):
|
|
|
assert name not in cachefuncs
|
|
|
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()
|
|
|
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 'obsstore' in repo._filecache:
|
|
|
repo.obsstore.caches.clear()
|
|
|
|
|
|
@cachefor('obsolete')
|
|
|
def _computeobsoleteset(repo):
|
|
|
"""the set of obsolete revisions"""
|
|
|
obs = set()
|
|
|
getnode = repo.changelog.node
|
|
|
notpublic = repo.revs("not public()")
|
|
|
for r in notpublic:
|
|
|
if getnode(r) in repo.obsstore.successors:
|
|
|
obs.add(r)
|
|
|
return obs
|
|
|
|
|
|
@cachefor('unstable')
|
|
|
def _computeunstableset(repo):
|
|
|
"""the set of non obsolete revisions with obsolete parents"""
|
|
|
revs = [(ctx.rev(), ctx) for ctx in
|
|
|
repo.set('(not public()) and (not obsolete())')]
|
|
|
revs.sort(key=lambda x:x[0])
|
|
|
unstable = set()
|
|
|
for rev, ctx in revs:
|
|
|
# A rev is unstable if one of its parent is obsolete or unstable
|
|
|
# this works since we traverse following growing rev order
|
|
|
if any((x.obsolete() or (x.rev() in unstable))
|
|
|
for x in ctx.parents()):
|
|
|
unstable.add(rev)
|
|
|
return unstable
|
|
|
|
|
|
@cachefor('suspended')
|
|
|
def _computesuspendedset(repo):
|
|
|
"""the set of obsolete parents with non obsolete descendants"""
|
|
|
suspended = repo.changelog.ancestors(getrevs(repo, 'unstable'))
|
|
|
return set(r for r in getrevs(repo, 'obsolete') if r in suspended)
|
|
|
|
|
|
@cachefor('extinct')
|
|
|
def _computeextinctset(repo):
|
|
|
"""the set of obsolete parents without non obsolete descendants"""
|
|
|
return getrevs(repo, 'obsolete') - getrevs(repo, 'suspended')
|
|
|
|
|
|
|
|
|
@cachefor('bumped')
|
|
|
def _computebumpedset(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.nodemap.get
|
|
|
for ctx in repo.set('(not public()) and (not obsolete())'):
|
|
|
rev = ctx.rev()
|
|
|
# We only evaluate mutable, non-obsolete revision
|
|
|
node = ctx.node()
|
|
|
# (future) A cache of precursors may worth if split is very common
|
|
|
for pnode in allprecursors(repo.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 precursor
|
|
|
bumped.add(rev)
|
|
|
break # Next draft!
|
|
|
return bumped
|
|
|
|
|
|
@cachefor('divergent')
|
|
|
def _computedivergentset(repo):
|
|
|
"""the set of rev that compete to be the final successors of some revision.
|
|
|
"""
|
|
|
divergent = set()
|
|
|
obsstore = repo.obsstore
|
|
|
newermap = {}
|
|
|
for ctx in repo.set('(not public()) - obsolete()'):
|
|
|
mark = obsstore.precursors.get(ctx.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:
|
|
|
successorssets(repo, prec, newermap)
|
|
|
newer = [n for n in newermap[prec] if n]
|
|
|
if len(newer) > 1:
|
|
|
divergent.add(ctx.rev())
|
|
|
break
|
|
|
toprocess.update(obsstore.precursors.get(prec, ()))
|
|
|
return divergent
|
|
|
|
|
|
|
|
|
def createmarkers(repo, relations, flag=0, date=None, metadata=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,
|
|
|
|
|
|
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 'user' not in metadata:
|
|
|
metadata['user'] = repo.ui.username()
|
|
|
tr = repo.transaction('add-obsolescence-marker')
|
|
|
try:
|
|
|
markerargs = []
|
|
|
for rel in relations:
|
|
|
prec = rel[0]
|
|
|
sucs = rel[1]
|
|
|
localmetadata = metadata.copy()
|
|
|
if 2 < len(rel):
|
|
|
localmetadata.update(rel[2])
|
|
|
|
|
|
if not prec.mutable():
|
|
|
raise error.Abort(_("cannot obsolete public changeset: %s")
|
|
|
% prec,
|
|
|
hint='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(_("changeset %s cannot obsolete itself")
|
|
|
% prec)
|
|
|
|
|
|
# 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)
|
|
|
repo.filteredrevcache.clear()
|
|
|
tr.close()
|
|
|
finally:
|
|
|
tr.release()
|
|
|
|
|
|
def isenabled(repo, option):
|
|
|
"""Returns True if the given repository has the given obsolete option
|
|
|
enabled.
|
|
|
"""
|
|
|
result = set(repo.ui.configlist('experimental', 'evolution'))
|
|
|
if 'all' in result:
|
|
|
return True
|
|
|
|
|
|
# For migration purposes, temporarily return true if the config hasn't been
|
|
|
# set but _enabled is true.
|
|
|
if len(result) == 0 and _enabled:
|
|
|
return True
|
|
|
|
|
|
# createmarkers must be enabled if other options are enabled
|
|
|
if ((allowunstableopt in result or exchangeopt in result) and
|
|
|
not createmarkersopt in result):
|
|
|
raise error.Abort(_("'createmarkers' obsolete option must be enabled "
|
|
|
"if other obsolete options are enabled"))
|
|
|
|
|
|
return option in result
|
|
|
|
