Mercurial > hg
view mercurial/dirstatemap.py @ 47507:d4c795576aeb
dirstate-entry: turn dirstate tuple into a real object (like in C)
With dirstate V2, the stored information and actual format will change. This mean we need to start an a better abstraction for a dirstate entry that a tuple directly accessed.
By chance, the C code is already doing this and pretend to be a tuple. So it
should be fairly easy. We start with turning the tuple into an object, we will
slowly migrate the dirstate code to no longer use the tuple directly in later
changesets.
Differential Revision: https://phab.mercurial-scm.org/D10949
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sat, 03 Jul 2021 03:48:35 +0200 |
parents | 8b7e47802deb |
children | eaae39894312 |
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# dirstatemap.py # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import errno from .i18n import _ from . import ( error, pathutil, policy, pycompat, txnutil, util, ) parsers = policy.importmod('parsers') rustmod = policy.importrust('dirstate') propertycache = util.propertycache dirstatetuple = parsers.dirstatetuple # a special value used internally for `size` if the file come from the other parent FROM_P2 = -2 # a special value used internally for `size` if the file is modified/merged/added NONNORMAL = -1 # a special value used internally for `time` if the time is ambigeous AMBIGUOUS_TIME = -1 class dirstatemap(object): """Map encapsulating the dirstate's contents. The dirstate contains the following state: - `identity` is the identity of the dirstate file, which can be used to detect when changes have occurred to the dirstate file. - `parents` is a pair containing the parents of the working copy. The parents are updated by calling `setparents`. - the state map maps filenames to tuples of (state, mode, size, mtime), where state is a single character representing 'normal', 'added', 'removed', or 'merged'. It is read by treating the dirstate as a dict. File state is updated by calling the `addfile`, `removefile` and `dropfile` methods. - `copymap` maps destination filenames to their source filename. The dirstate also provides the following views onto the state: - `nonnormalset` is a set of the filenames that have state other than 'normal', or are normal but have an mtime of -1 ('normallookup'). - `otherparentset` is a set of the filenames that are marked as coming from the second parent when the dirstate is currently being merged. - `filefoldmap` is a dict mapping normalized filenames to the denormalized form that they appear as in the dirstate. - `dirfoldmap` is a dict mapping normalized directory names to the denormalized form that they appear as in the dirstate. """ def __init__(self, ui, opener, root, nodeconstants, use_dirstate_v2): self._ui = ui self._opener = opener self._root = root self._filename = b'dirstate' self._nodelen = 20 self._nodeconstants = nodeconstants assert ( not use_dirstate_v2 ), "should have detected unsupported requirement" self._parents = None self._dirtyparents = False # for consistent view between _pl() and _read() invocations self._pendingmode = None @propertycache def _map(self): self._map = {} self.read() return self._map @propertycache def copymap(self): self.copymap = {} self._map return self.copymap def directories(self): # Rust / dirstate-v2 only return [] def clear(self): self._map.clear() self.copymap.clear() self.setparents(self._nodeconstants.nullid, self._nodeconstants.nullid) util.clearcachedproperty(self, b"_dirs") util.clearcachedproperty(self, b"_alldirs") util.clearcachedproperty(self, b"filefoldmap") util.clearcachedproperty(self, b"dirfoldmap") util.clearcachedproperty(self, b"nonnormalset") util.clearcachedproperty(self, b"otherparentset") def items(self): return pycompat.iteritems(self._map) # forward for python2,3 compat iteritems = items def __len__(self): return len(self._map) def __iter__(self): return iter(self._map) def get(self, key, default=None): return self._map.get(key, default) def __contains__(self, key): return key in self._map def __getitem__(self, key): return self._map[key] def keys(self): return self._map.keys() def preload(self): """Loads the underlying data, if it's not already loaded""" self._map def addfile(self, f, oldstate, state, mode, size, mtime): """Add a tracked file to the dirstate.""" if oldstate in b"?r" and "_dirs" in self.__dict__: self._dirs.addpath(f) if oldstate == b"?" and "_alldirs" in self.__dict__: self._alldirs.addpath(f) self._map[f] = dirstatetuple(state, mode, size, mtime) if state != b'n' or mtime == AMBIGUOUS_TIME: self.nonnormalset.add(f) if size == FROM_P2: self.otherparentset.add(f) def removefile(self, f, oldstate, size): """ Mark a file as removed in the dirstate. The `size` parameter is used to store sentinel values that indicate the file's previous state. In the future, we should refactor this to be more explicit about what that state is. """ if oldstate not in b"?r" and "_dirs" in self.__dict__: self._dirs.delpath(f) if oldstate == b"?" and "_alldirs" in self.__dict__: self._alldirs.addpath(f) if "filefoldmap" in self.__dict__: normed = util.normcase(f) self.filefoldmap.pop(normed, None) self._map[f] = dirstatetuple(b'r', 0, size, 0) self.nonnormalset.add(f) def dropfile(self, f, oldstate): """ Remove a file from the dirstate. Returns True if the file was previously recorded. """ exists = self._map.pop(f, None) is not None if exists: if oldstate != b"r" and "_dirs" in self.__dict__: self._dirs.delpath(f) if "_alldirs" in self.__dict__: self._alldirs.delpath(f) if "filefoldmap" in self.__dict__: normed = util.normcase(f) self.filefoldmap.pop(normed, None) self.nonnormalset.discard(f) return exists def clearambiguoustimes(self, files, now): for f in files: e = self.get(f) if e is not None and e[0] == b'n' and e[3] == now: self._map[f] = dirstatetuple(e[0], e[1], e[2], AMBIGUOUS_TIME) self.nonnormalset.add(f) def nonnormalentries(self): '''Compute the nonnormal dirstate entries from the dmap''' try: return parsers.nonnormalotherparententries(self._map) except AttributeError: nonnorm = set() otherparent = set() for fname, e in pycompat.iteritems(self._map): if e[0] != b'n' or e[3] == AMBIGUOUS_TIME: nonnorm.add(fname) if e[0] == b'n' and e[2] == FROM_P2: otherparent.add(fname) return nonnorm, otherparent @propertycache def filefoldmap(self): """Returns a dictionary mapping normalized case paths to their non-normalized versions. """ try: makefilefoldmap = parsers.make_file_foldmap except AttributeError: pass else: return makefilefoldmap( self._map, util.normcasespec, util.normcasefallback ) f = {} normcase = util.normcase for name, s in pycompat.iteritems(self._map): if s[0] != b'r': f[normcase(name)] = name f[b'.'] = b'.' # prevents useless util.fspath() invocation return f def hastrackeddir(self, d): """ Returns True if the dirstate contains a tracked (not removed) file in this directory. """ return d in self._dirs def hasdir(self, d): """ Returns True if the dirstate contains a file (tracked or removed) in this directory. """ return d in self._alldirs @propertycache def _dirs(self): return pathutil.dirs(self._map, b'r') @propertycache def _alldirs(self): return pathutil.dirs(self._map) def _opendirstatefile(self): fp, mode = txnutil.trypending(self._root, self._opener, self._filename) if self._pendingmode is not None and self._pendingmode != mode: fp.close() raise error.Abort( _(b'working directory state may be changed parallelly') ) self._pendingmode = mode return fp def parents(self): if not self._parents: try: fp = self._opendirstatefile() st = fp.read(2 * self._nodelen) fp.close() except IOError as err: if err.errno != errno.ENOENT: raise # File doesn't exist, so the current state is empty st = b'' l = len(st) if l == self._nodelen * 2: self._parents = ( st[: self._nodelen], st[self._nodelen : 2 * self._nodelen], ) elif l == 0: self._parents = ( self._nodeconstants.nullid, self._nodeconstants.nullid, ) else: raise error.Abort( _(b'working directory state appears damaged!') ) return self._parents def setparents(self, p1, p2): self._parents = (p1, p2) self._dirtyparents = True def read(self): # ignore HG_PENDING because identity is used only for writing self.identity = util.filestat.frompath( self._opener.join(self._filename) ) try: fp = self._opendirstatefile() try: st = fp.read() finally: fp.close() except IOError as err: if err.errno != errno.ENOENT: raise return if not st: return if util.safehasattr(parsers, b'dict_new_presized'): # Make an estimate of the number of files in the dirstate based on # its size. This trades wasting some memory for avoiding costly # resizes. Each entry have a prefix of 17 bytes followed by one or # two path names. Studies on various large-scale real-world repositories # found 54 bytes a reasonable upper limit for the average path names. # Copy entries are ignored for the sake of this estimate. self._map = parsers.dict_new_presized(len(st) // 71) # Python's garbage collector triggers a GC each time a certain number # of container objects (the number being defined by # gc.get_threshold()) are allocated. parse_dirstate creates a tuple # for each file in the dirstate. The C version then immediately marks # them as not to be tracked by the collector. However, this has no # effect on when GCs are triggered, only on what objects the GC looks # into. This means that O(number of files) GCs are unavoidable. # Depending on when in the process's lifetime the dirstate is parsed, # this can get very expensive. As a workaround, disable GC while # parsing the dirstate. # # (we cannot decorate the function directly since it is in a C module) parse_dirstate = util.nogc(parsers.parse_dirstate) p = parse_dirstate(self._map, self.copymap, st) if not self._dirtyparents: self.setparents(*p) # Avoid excess attribute lookups by fast pathing certain checks self.__contains__ = self._map.__contains__ self.__getitem__ = self._map.__getitem__ self.get = self._map.get def write(self, st, now): st.write( parsers.pack_dirstate(self._map, self.copymap, self.parents(), now) ) st.close() self._dirtyparents = False self.nonnormalset, self.otherparentset = self.nonnormalentries() @propertycache def nonnormalset(self): nonnorm, otherparents = self.nonnormalentries() self.otherparentset = otherparents return nonnorm @propertycache def otherparentset(self): nonnorm, otherparents = self.nonnormalentries() self.nonnormalset = nonnorm return otherparents def non_normal_or_other_parent_paths(self): return self.nonnormalset.union(self.otherparentset) @propertycache def identity(self): self._map return self.identity @propertycache def dirfoldmap(self): f = {} normcase = util.normcase for name in self._dirs: f[normcase(name)] = name return f if rustmod is not None: class dirstatemap(object): def __init__(self, ui, opener, root, nodeconstants, use_dirstate_v2): self._use_dirstate_v2 = use_dirstate_v2 self._nodeconstants = nodeconstants self._ui = ui self._opener = opener self._root = root self._filename = b'dirstate' self._nodelen = 20 # Also update Rust code when changing this! self._parents = None self._dirtyparents = False # for consistent view between _pl() and _read() invocations self._pendingmode = None self._use_dirstate_tree = self._ui.configbool( b"experimental", b"dirstate-tree.in-memory", False, ) def addfile(self, *args, **kwargs): return self._rustmap.addfile(*args, **kwargs) def removefile(self, *args, **kwargs): return self._rustmap.removefile(*args, **kwargs) def dropfile(self, *args, **kwargs): return self._rustmap.dropfile(*args, **kwargs) def clearambiguoustimes(self, *args, **kwargs): return self._rustmap.clearambiguoustimes(*args, **kwargs) def nonnormalentries(self): return self._rustmap.nonnormalentries() def get(self, *args, **kwargs): return self._rustmap.get(*args, **kwargs) @property def copymap(self): return self._rustmap.copymap() def directories(self): return self._rustmap.directories() def preload(self): self._rustmap def clear(self): self._rustmap.clear() self.setparents( self._nodeconstants.nullid, self._nodeconstants.nullid ) util.clearcachedproperty(self, b"_dirs") util.clearcachedproperty(self, b"_alldirs") util.clearcachedproperty(self, b"dirfoldmap") def items(self): return self._rustmap.items() def keys(self): return iter(self._rustmap) def __contains__(self, key): return key in self._rustmap def __getitem__(self, item): return self._rustmap[item] def __len__(self): return len(self._rustmap) def __iter__(self): return iter(self._rustmap) # forward for python2,3 compat iteritems = items def _opendirstatefile(self): fp, mode = txnutil.trypending( self._root, self._opener, self._filename ) if self._pendingmode is not None and self._pendingmode != mode: fp.close() raise error.Abort( _(b'working directory state may be changed parallelly') ) self._pendingmode = mode return fp def setparents(self, p1, p2): self._parents = (p1, p2) self._dirtyparents = True def parents(self): if not self._parents: if self._use_dirstate_v2: offset = len(rustmod.V2_FORMAT_MARKER) else: offset = 0 read_len = offset + self._nodelen * 2 try: fp = self._opendirstatefile() st = fp.read(read_len) fp.close() except IOError as err: if err.errno != errno.ENOENT: raise # File doesn't exist, so the current state is empty st = b'' l = len(st) if l == read_len: st = st[offset:] self._parents = ( st[: self._nodelen], st[self._nodelen : 2 * self._nodelen], ) elif l == 0: self._parents = ( self._nodeconstants.nullid, self._nodeconstants.nullid, ) else: raise error.Abort( _(b'working directory state appears damaged!') ) return self._parents @propertycache def _rustmap(self): """ Fills the Dirstatemap when called. """ # ignore HG_PENDING because identity is used only for writing self.identity = util.filestat.frompath( self._opener.join(self._filename) ) try: fp = self._opendirstatefile() try: st = fp.read() finally: fp.close() except IOError as err: if err.errno != errno.ENOENT: raise st = b'' self._rustmap, parents = rustmod.DirstateMap.new( self._use_dirstate_tree, self._use_dirstate_v2, st ) if parents and not self._dirtyparents: self.setparents(*parents) self.__contains__ = self._rustmap.__contains__ self.__getitem__ = self._rustmap.__getitem__ self.get = self._rustmap.get return self._rustmap def write(self, st, now): parents = self.parents() packed = self._rustmap.write( self._use_dirstate_v2, parents[0], parents[1], now ) st.write(packed) st.close() self._dirtyparents = False @propertycache def filefoldmap(self): """Returns a dictionary mapping normalized case paths to their non-normalized versions. """ return self._rustmap.filefoldmapasdict() def hastrackeddir(self, d): return self._rustmap.hastrackeddir(d) def hasdir(self, d): return self._rustmap.hasdir(d) @propertycache def identity(self): self._rustmap return self.identity @property def nonnormalset(self): nonnorm = self._rustmap.non_normal_entries() return nonnorm @propertycache def otherparentset(self): otherparents = self._rustmap.other_parent_entries() return otherparents def non_normal_or_other_parent_paths(self): return self._rustmap.non_normal_or_other_parent_paths() @propertycache def dirfoldmap(self): f = {} normcase = util.normcase for name, _pseudo_entry in self.directories(): f[normcase(name)] = name return f