Mercurial > hg
view mercurial/obsolete.py @ 41013:ef103c96ed33
fuzz: extract Python initialization to utility package
Avoids code duplication between fuzzers of parsers.so.
Differential Revision: https://phab.mercurial-scm.org/D5461
author | Augie Fackler <augie@google.com> |
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date | Wed, 19 Dec 2018 21:57:23 -0500 |
parents | 6e2a24550b7e |
children | 566daffc607d |
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# 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 . import ( encoding, error, node, obsutil, phases, policy, pycompat, util, ) from .utils import dateutil parsers = policy.importmod(r'parsers') _pack = struct.pack _unpack = struct.unpack _calcsize = struct.calcsize propertycache = util.propertycache # the obsolete feature is not mature enough to be enabled by default. # you have to rely on third party extension extension to enable this. _enabled = False # Options for obsolescence createmarkersopt = 'createmarkers' allowunstableopt = 'allowunstable' exchangeopt = 'exchange' def _getoptionvalue(repo, option): """Returns True if the given repository has the given obsolete option enabled. """ configkey = 'evolution.%s' % option newconfig = repo.ui.configbool('experimental', configkey) # Return the value only if defined if newconfig is not None: return newconfig # Fallback on generic option try: return repo.ui.configbool('experimental', 'evolution') except (error.ConfigError, AttributeError): # Fallback on old-fashion config # inconsistent config: experimental.evolution 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 # Temporary hack for next check newconfig = repo.ui.config('experimental', 'evolution.createmarkers') if newconfig: result.add('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(_("'createmarkers' obsolete option must be enabled " "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 = '>BIB20s' _fm0node = '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(_('parsing obsolete marker: metadata is too ' 'short, %d bytes expected, got %d') % (mdsize, len(metadata))) off += mdsize metadata = _fm0decodemeta(metadata) try: when, offset = metadata.pop('date', '0 0').split(' ') date = float(when), int(offset) except ValueError: date = (0., 0) parents = None if 'p2' in metadata: parents = (metadata.pop('p1', None), metadata.pop('p2', None)) elif 'p1' in metadata: parents = (metadata.pop('p1', None),) elif '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(metadata.iteritems())) yield (pre, sucs, flags, metadata, date, parents) def _fm0encodeonemarker(marker): pre, sucs, flags, metadata, date, parents = marker if flags & usingsha256: raise error.Abort(_('cannot handle sha256 with old obsstore format')) metadata = dict(metadata) time, tz = date metadata['date'] = '%r %i' % (time, tz) if parents is not None: if not parents: # mark that we explicitly recorded no parents metadata['p0'] = '' for i, p in enumerate(parents, 1): metadata['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 meta.iteritems(): if ':' in key or '\0' in key: raise ValueError("':' and '\0' are forbidden in metadata key'") if '\0' in value: raise ValueError("':' is forbidden in metadata value'") return '\0'.join(['%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('\0'): if l: key, value = l.split(':', 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 = '>IdhHBBB20s' _fm1nodesha1 = '20s' _fm1nodesha256 = '32s' _fm1nodesha1size = _calcsize(_fm1nodesha1) _fm1nodesha256size = _calcsize(_fm1nodesha256) _fm1fsize = _calcsize(_fm1fixed) _fm1parentnone = 3 _fm1parentshift = 14 _fm1parentmask = (_fm1parentnone << _fm1parentshift) _fm1metapair = '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('>' + (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 = ('obsstore metadata key cannot be longer than 255 bytes' ' (key "%s" is %u bytes)') % (key, lk) raise error.ProgrammingError(msg) if lv > 255: msg = ('obsstore metadata value cannot be longer than 255 bytes' ' (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 ''.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', 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 = _('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', 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(_('bad obsolescence marker detected: ' '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 = ('prec', 'succs', 'flag', 'meta', 'date', '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(r'_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 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 'date' in metadata: # as a courtesy for out-of-tree extensions date = dateutil.parsedate(metadata.pop('date')) elif ui is not None: date = ui.configdate('devel', '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( r'in-marker cycle with %s' % pycompat.sysstr(node.hex(prec))) metadata = tuple(sorted(metadata.iteritems())) 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( 'obsstore metadata must be valid UTF-8 sequence ' '(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(_('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('obsstore', 'ab') try: offset = f.tell() transaction.add('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('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('new_obsmarkers', '0')) transaction.hookargs['new_obsmarkers'] = '%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('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(r'successors'): _addsuccessors(self.successors, markers) if self._cached(r'predecessors'): _addpredecessors(self.predecessors, markers) if self._cached(r'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 = set([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('format', 'obsstore-version') # rely on obsstore class default when possible. kwargs = {} if defaultformat is not None: kwargs[r'defaultformat'] = defaultformat readonly = not isenabled(repo, createmarkersopt) store = obsstore(repo.svfs, readonly=readonly, **kwargs) if store and readonly: ui.warn(_('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 = ''.join([_pack('>B', _fm0version)] + part) keys['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('dump'): repo.ui.warn(_('unknown key: %r') % key) return False if old: repo.ui.warn(_('unexpected old value for %r') % key) return False data = util.b85decode(new) with repo.lock(), repo.transaction('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 = "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() 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() def _mutablerevs(repo): """the set of mutable revision in the repository""" return repo._phasecache.getrevset(repo, phases.mutablephases) @cachefor('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('orphan') def _computeorphanset(repo): """the set of non obsolete revisions with obsolete parents""" pfunc = repo.changelog.parentrevs mutable = _mutablerevs(repo) obsolete = getrevs(repo, '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('suspended') def _computesuspendedset(repo): """the set of obsolete parents with non obsolete descendants""" suspended = repo.changelog.ancestors(getrevs(repo, 'orphan')) 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('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.nodemap.get tonode = cl.node obsstore = repo.obsstore for rev in repo.revs('(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('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('(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('%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 'user' not in metadata: luser = repo.ui.config('devel', 'user.obsmarker') or repo.ui.username() metadata['user'] = encoding.fromlocal(luser) # Operation metadata handling useoperation = repo.ui.configbool('experimental', 'evolution.track-operation') if useoperation and operation: metadata['operation'] = operation # Effect flag metadata handling saveeffectflag = repo.ui.configbool('experimental', 'evolution.effect-flags') with repo.transaction('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 = '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['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['fold-id'] = foldid localmetadata['fold-idx'] = '%d' % foldidx localmetadata['fold-size'] = '%d' % foldsize 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) # 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] = "%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()