tests: replace [[]] bashism with portable [] invocation
In this case nothing fancy is required.
Differential Revision: https://phab.mercurial-scm.org/D7596
# obsolete.py - obsolete markers handling
#
# Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
# Logilab SA <contact@logilab.fr>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""Obsolete marker handling
An obsolete marker maps an old changeset to a list of new
changesets. If the list of new changesets is empty, the old changeset
is said to be "killed". Otherwise, the old changeset is being
"replaced" by the new changesets.
Obsolete markers can be used to record and distribute changeset graph
transformations performed by history rewrite operations, and help
building new tools to reconcile conflicting rewrite actions. To
facilitate conflict resolution, markers include various annotations
besides old and news changeset identifiers, such as creation date or
author name.
The old obsoleted changeset is called a "predecessor" and possible
replacements are called "successors". Markers that used changeset X as
a predecessor are called "successor markers of X" because they hold
information about the successors of X. Markers that use changeset Y as
a successors are call "predecessor markers of Y" because they hold
information about the predecessors of Y.
Examples:
- When changeset A is replaced by changeset A', one marker is stored:
(A, (A',))
- When changesets A and B are folded into a new changeset C, two markers are
stored:
(A, (C,)) and (B, (C,))
- When changeset A is simply "pruned" from the graph, a marker is created:
(A, ())
- When changeset A is split into B and C, a single marker is used:
(A, (B, C))
We use a single marker to distinguish the "split" case from the "divergence"
case. If two independent operations rewrite the same changeset A in to A' and
A'', we have an error case: divergent rewriting. We can detect it because
two markers will be created independently:
(A, (B,)) and (A, (C,))
Format
------
Markers are stored in an append-only file stored in
'.hg/store/obsstore'.
The file starts with a version header:
- 1 unsigned byte: version number, starting at zero.
The header is followed by the markers. Marker format depend of the version. See
comment associated with each format for details.
"""
from __future__ import absolute_import
import errno
import hashlib
import struct
from .i18n import _
from .pycompat import getattr
from . import (
encoding,
error,
node,
obsutil,
phases,
policy,
pycompat,
util,
)
from .utils import dateutil
parsers = policy.importmod('parsers')
_pack = struct.pack
_unpack = struct.unpack
_calcsize = struct.calcsize
propertycache = util.propertycache
# Options for obsolescence
createmarkersopt = b'createmarkers'
allowunstableopt = b'allowunstable'
exchangeopt = b'exchange'
def _getoptionvalue(repo, option):
"""Returns True if the given repository has the given obsolete option
enabled.
"""
configkey = b'evolution.%s' % option
newconfig = repo.ui.configbool(b'experimental', configkey)
# Return the value only if defined
if newconfig is not None:
return newconfig
# Fallback on generic option
try:
return repo.ui.configbool(b'experimental', b'evolution')
except (error.ConfigError, AttributeError):
# Fallback on old-fashion config
# inconsistent config: experimental.evolution
result = set(repo.ui.configlist(b'experimental', b'evolution'))
if b'all' in result:
return True
# Temporary hack for next check
newconfig = repo.ui.config(b'experimental', b'evolution.createmarkers')
if newconfig:
result.add(b'createmarkers')
return option in result
def getoptions(repo):
"""Returns dicts showing state of obsolescence features."""
createmarkersvalue = _getoptionvalue(repo, createmarkersopt)
unstablevalue = _getoptionvalue(repo, allowunstableopt)
exchangevalue = _getoptionvalue(repo, exchangeopt)
# createmarkers must be enabled if other options are enabled
if (unstablevalue or exchangevalue) and not createmarkersvalue:
raise error.Abort(
_(
b"'createmarkers' obsolete option must be enabled "
b"if other obsolete options are enabled"
)
)
return {
createmarkersopt: createmarkersvalue,
allowunstableopt: unstablevalue,
exchangeopt: exchangevalue,
}
def isenabled(repo, option):
"""Returns True if the given repository has the given obsolete option
enabled.
"""
return getoptions(repo)[option]
# Creating aliases for marker flags because evolve extension looks for
# bumpedfix in obsolete.py
bumpedfix = obsutil.bumpedfix
usingsha256 = obsutil.usingsha256
## Parsing and writing of version "0"
#
# The header is followed by the markers. Each marker is made of:
#
# - 1 uint8 : number of new changesets "N", can be zero.
#
# - 1 uint32: metadata size "M" in bytes.
#
# - 1 byte: a bit field. It is reserved for flags used in common
# obsolete marker operations, to avoid repeated decoding of metadata
# entries.
#
# - 20 bytes: obsoleted changeset identifier.
#
# - N*20 bytes: new changesets identifiers.
#
# - M bytes: metadata as a sequence of nul-terminated strings. Each
# string contains a key and a value, separated by a colon ':', without
# additional encoding. Keys cannot contain '\0' or ':' and values
# cannot contain '\0'.
_fm0version = 0
_fm0fixed = b'>BIB20s'
_fm0node = b'20s'
_fm0fsize = _calcsize(_fm0fixed)
_fm0fnodesize = _calcsize(_fm0node)
def _fm0readmarkers(data, off, stop):
# Loop on markers
while off < stop:
# read fixed part
cur = data[off : off + _fm0fsize]
off += _fm0fsize
numsuc, mdsize, flags, pre = _unpack(_fm0fixed, cur)
# read replacement
sucs = ()
if numsuc:
s = _fm0fnodesize * numsuc
cur = data[off : off + s]
sucs = _unpack(_fm0node * numsuc, cur)
off += s
# read metadata
# (metadata will be decoded on demand)
metadata = data[off : off + mdsize]
if len(metadata) != mdsize:
raise error.Abort(
_(
b'parsing obsolete marker: metadata is too '
b'short, %d bytes expected, got %d'
)
% (mdsize, len(metadata))
)
off += mdsize
metadata = _fm0decodemeta(metadata)
try:
when, offset = metadata.pop(b'date', b'0 0').split(b' ')
date = float(when), int(offset)
except ValueError:
date = (0.0, 0)
parents = None
if b'p2' in metadata:
parents = (metadata.pop(b'p1', None), metadata.pop(b'p2', None))
elif b'p1' in metadata:
parents = (metadata.pop(b'p1', None),)
elif b'p0' in metadata:
parents = ()
if parents is not None:
try:
parents = tuple(node.bin(p) for p in parents)
# if parent content is not a nodeid, drop the data
for p in parents:
if len(p) != 20:
parents = None
break
except TypeError:
# if content cannot be translated to nodeid drop the data.
parents = None
metadata = tuple(sorted(pycompat.iteritems(metadata)))
yield (pre, sucs, flags, metadata, date, parents)
def _fm0encodeonemarker(marker):
pre, sucs, flags, metadata, date, parents = marker
if flags & usingsha256:
raise error.Abort(_(b'cannot handle sha256 with old obsstore format'))
metadata = dict(metadata)
time, tz = date
metadata[b'date'] = b'%r %i' % (time, tz)
if parents is not None:
if not parents:
# mark that we explicitly recorded no parents
metadata[b'p0'] = b''
for i, p in enumerate(parents, 1):
metadata[b'p%i' % i] = node.hex(p)
metadata = _fm0encodemeta(metadata)
numsuc = len(sucs)
format = _fm0fixed + (_fm0node * numsuc)
data = [numsuc, len(metadata), flags, pre]
data.extend(sucs)
return _pack(format, *data) + metadata
def _fm0encodemeta(meta):
"""Return encoded metadata string to string mapping.
Assume no ':' in key and no '\0' in both key and value."""
for key, value in pycompat.iteritems(meta):
if b':' in key or b'\0' in key:
raise ValueError(b"':' and '\0' are forbidden in metadata key'")
if b'\0' in value:
raise ValueError(b"':' is forbidden in metadata value'")
return b'\0'.join([b'%s:%s' % (k, meta[k]) for k in sorted(meta)])
def _fm0decodemeta(data):
"""Return string to string dictionary from encoded version."""
d = {}
for l in data.split(b'\0'):
if l:
key, value = l.split(b':', 1)
d[key] = value
return d
## Parsing and writing of version "1"
#
# The header is followed by the markers. Each marker is made of:
#
# - uint32: total size of the marker (including this field)
#
# - float64: date in seconds since epoch
#
# - int16: timezone offset in minutes
#
# - uint16: a bit field. It is reserved for flags used in common
# obsolete marker operations, to avoid repeated decoding of metadata
# entries.
#
# - uint8: number of successors "N", can be zero.
#
# - uint8: number of parents "P", can be zero.
#
# 0: parents data stored but no parent,
# 1: one parent stored,
# 2: two parents stored,
# 3: no parent data stored
#
# - uint8: number of metadata entries M
#
# - 20 or 32 bytes: predecessor changeset identifier.
#
# - N*(20 or 32) bytes: successors changesets identifiers.
#
# - P*(20 or 32) bytes: parents of the predecessors changesets.
#
# - M*(uint8, uint8): size of all metadata entries (key and value)
#
# - remaining bytes: the metadata, each (key, value) pair after the other.
_fm1version = 1
_fm1fixed = b'>IdhHBBB20s'
_fm1nodesha1 = b'20s'
_fm1nodesha256 = b'32s'
_fm1nodesha1size = _calcsize(_fm1nodesha1)
_fm1nodesha256size = _calcsize(_fm1nodesha256)
_fm1fsize = _calcsize(_fm1fixed)
_fm1parentnone = 3
_fm1parentshift = 14
_fm1parentmask = _fm1parentnone << _fm1parentshift
_fm1metapair = b'BB'
_fm1metapairsize = _calcsize(_fm1metapair)
def _fm1purereadmarkers(data, off, stop):
# make some global constants local for performance
noneflag = _fm1parentnone
sha2flag = usingsha256
sha1size = _fm1nodesha1size
sha2size = _fm1nodesha256size
sha1fmt = _fm1nodesha1
sha2fmt = _fm1nodesha256
metasize = _fm1metapairsize
metafmt = _fm1metapair
fsize = _fm1fsize
unpack = _unpack
# Loop on markers
ufixed = struct.Struct(_fm1fixed).unpack
while off < stop:
# read fixed part
o1 = off + fsize
t, secs, tz, flags, numsuc, numpar, nummeta, prec = ufixed(data[off:o1])
if flags & sha2flag:
# FIXME: prec was read as a SHA1, needs to be amended
# read 0 or more successors
if numsuc == 1:
o2 = o1 + sha2size
sucs = (data[o1:o2],)
else:
o2 = o1 + sha2size * numsuc
sucs = unpack(sha2fmt * numsuc, data[o1:o2])
# read parents
if numpar == noneflag:
o3 = o2
parents = None
elif numpar == 1:
o3 = o2 + sha2size
parents = (data[o2:o3],)
else:
o3 = o2 + sha2size * numpar
parents = unpack(sha2fmt * numpar, data[o2:o3])
else:
# read 0 or more successors
if numsuc == 1:
o2 = o1 + sha1size
sucs = (data[o1:o2],)
else:
o2 = o1 + sha1size * numsuc
sucs = unpack(sha1fmt * numsuc, data[o1:o2])
# read parents
if numpar == noneflag:
o3 = o2
parents = None
elif numpar == 1:
o3 = o2 + sha1size
parents = (data[o2:o3],)
else:
o3 = o2 + sha1size * numpar
parents = unpack(sha1fmt * numpar, data[o2:o3])
# read metadata
off = o3 + metasize * nummeta
metapairsize = unpack(b'>' + (metafmt * nummeta), data[o3:off])
metadata = []
for idx in pycompat.xrange(0, len(metapairsize), 2):
o1 = off + metapairsize[idx]
o2 = o1 + metapairsize[idx + 1]
metadata.append((data[off:o1], data[o1:o2]))
off = o2
yield (prec, sucs, flags, tuple(metadata), (secs, tz * 60), parents)
def _fm1encodeonemarker(marker):
pre, sucs, flags, metadata, date, parents = marker
# determine node size
_fm1node = _fm1nodesha1
if flags & usingsha256:
_fm1node = _fm1nodesha256
numsuc = len(sucs)
numextranodes = numsuc
if parents is None:
numpar = _fm1parentnone
else:
numpar = len(parents)
numextranodes += numpar
formatnodes = _fm1node * numextranodes
formatmeta = _fm1metapair * len(metadata)
format = _fm1fixed + formatnodes + formatmeta
# tz is stored in minutes so we divide by 60
tz = date[1] // 60
data = [None, date[0], tz, flags, numsuc, numpar, len(metadata), pre]
data.extend(sucs)
if parents is not None:
data.extend(parents)
totalsize = _calcsize(format)
for key, value in metadata:
lk = len(key)
lv = len(value)
if lk > 255:
msg = (
b'obsstore metadata key cannot be longer than 255 bytes'
b' (key "%s" is %u bytes)'
) % (key, lk)
raise error.ProgrammingError(msg)
if lv > 255:
msg = (
b'obsstore metadata value cannot be longer than 255 bytes'
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 node.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).
"""
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 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(node.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), 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(
_(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 = set(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 set(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 = hashlib.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 node.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()