Mercurial > hg-stable
view mercurial/revlog.py @ 51029:299b7b5440db
revlog: drop the df argument to `sidedata`
The intend of this argument is better filled by the `revlog.reading` or
`revlog._writing` context. So we drop it to leave rooms for further cleanup and
improvements.
| author | Pierre-Yves David <pierre-yves.david@octobus.net> |
|---|---|
| date | Tue, 26 Sep 2023 00:55:49 +0200 |
| parents | 14de15825253 |
| children | 9011c38b4f65 |
line wrap: on
line source
# revlog.py - storage back-end for mercurial # coding: utf8 # # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. """Storage back-end for Mercurial. This provides efficient delta storage with O(1) retrieve and append and O(changes) merge between branches. """ import binascii import collections import contextlib import io import os import struct import weakref import zlib # import stuff from node for others to import from revlog from .node import ( bin, hex, nullrev, sha1nodeconstants, short, wdirrev, ) from .i18n import _ from .revlogutils.constants import ( ALL_KINDS, CHANGELOGV2, COMP_MODE_DEFAULT, COMP_MODE_INLINE, COMP_MODE_PLAIN, DELTA_BASE_REUSE_NO, DELTA_BASE_REUSE_TRY, ENTRY_RANK, FEATURES_BY_VERSION, FLAG_GENERALDELTA, FLAG_INLINE_DATA, INDEX_HEADER, KIND_CHANGELOG, KIND_FILELOG, RANK_UNKNOWN, REVLOGV0, REVLOGV1, REVLOGV1_FLAGS, REVLOGV2, REVLOGV2_FLAGS, REVLOG_DEFAULT_FLAGS, REVLOG_DEFAULT_FORMAT, REVLOG_DEFAULT_VERSION, SUPPORTED_FLAGS, ) from .revlogutils.flagutil import ( REVIDX_DEFAULT_FLAGS, REVIDX_ELLIPSIS, REVIDX_EXTSTORED, REVIDX_FLAGS_ORDER, REVIDX_HASCOPIESINFO, REVIDX_ISCENSORED, REVIDX_RAWTEXT_CHANGING_FLAGS, ) from .thirdparty import attr from . import ( ancestor, dagop, error, mdiff, policy, pycompat, revlogutils, templatefilters, util, ) from .interfaces import ( repository, util as interfaceutil, ) from .revlogutils import ( deltas as deltautil, docket as docketutil, flagutil, nodemap as nodemaputil, randomaccessfile, revlogv0, rewrite, sidedata as sidedatautil, ) from .utils import ( storageutil, stringutil, ) # blanked usage of all the name to prevent pyflakes constraints # We need these name available in the module for extensions. REVLOGV0 REVLOGV1 REVLOGV2 CHANGELOGV2 FLAG_INLINE_DATA FLAG_GENERALDELTA REVLOG_DEFAULT_FLAGS REVLOG_DEFAULT_FORMAT REVLOG_DEFAULT_VERSION REVLOGV1_FLAGS REVLOGV2_FLAGS REVIDX_ISCENSORED REVIDX_ELLIPSIS REVIDX_HASCOPIESINFO REVIDX_EXTSTORED REVIDX_DEFAULT_FLAGS REVIDX_FLAGS_ORDER REVIDX_RAWTEXT_CHANGING_FLAGS parsers = policy.importmod('parsers') rustancestor = policy.importrust('ancestor') rustdagop = policy.importrust('dagop') rustrevlog = policy.importrust('revlog') # Aliased for performance. _zlibdecompress = zlib.decompress # max size of inline data embedded into a revlog _maxinline = 131072 # Flag processors for REVIDX_ELLIPSIS. def ellipsisreadprocessor(rl, text): return text, False def ellipsiswriteprocessor(rl, text): return text, False def ellipsisrawprocessor(rl, text): return False ellipsisprocessor = ( ellipsisreadprocessor, ellipsiswriteprocessor, ellipsisrawprocessor, ) def _verify_revision(rl, skipflags, state, node): """Verify the integrity of the given revlog ``node`` while providing a hook point for extensions to influence the operation.""" if skipflags: state[b'skipread'].add(node) else: # Side-effect: read content and verify hash. rl.revision(node) # True if a fast implementation for persistent-nodemap is available # # We also consider we have a "fast" implementation in "pure" python because # people using pure don't really have performance consideration (and a # wheelbarrow of other slowness source) HAS_FAST_PERSISTENT_NODEMAP = rustrevlog is not None or hasattr( parsers, 'BaseIndexObject' ) @interfaceutil.implementer(repository.irevisiondelta) @attr.s(slots=True) class revlogrevisiondelta: node = attr.ib() p1node = attr.ib() p2node = attr.ib() basenode = attr.ib() flags = attr.ib() baserevisionsize = attr.ib() revision = attr.ib() delta = attr.ib() sidedata = attr.ib() protocol_flags = attr.ib() linknode = attr.ib(default=None) @interfaceutil.implementer(repository.iverifyproblem) @attr.s(frozen=True) class revlogproblem: warning = attr.ib(default=None) error = attr.ib(default=None) node = attr.ib(default=None) def parse_index_v1(data, inline): # call the C implementation to parse the index data index, cache = parsers.parse_index2(data, inline) return index, cache def parse_index_v2(data, inline): # call the C implementation to parse the index data index, cache = parsers.parse_index2(data, inline, format=REVLOGV2) return index, cache def parse_index_cl_v2(data, inline): # call the C implementation to parse the index data index, cache = parsers.parse_index2(data, inline, format=CHANGELOGV2) return index, cache if hasattr(parsers, 'parse_index_devel_nodemap'): def parse_index_v1_nodemap(data, inline): index, cache = parsers.parse_index_devel_nodemap(data, inline) return index, cache else: parse_index_v1_nodemap = None def parse_index_v1_mixed(data, inline): index, cache = parse_index_v1(data, inline) return rustrevlog.MixedIndex(index), cache # corresponds to uncompressed length of indexformatng (2 gigs, 4-byte # signed integer) _maxentrysize = 0x7FFFFFFF FILE_TOO_SHORT_MSG = _( b'cannot read from revlog %s;' b' expected %d bytes from offset %d, data size is %d' ) hexdigits = b'0123456789abcdefABCDEF' class revlog: """ the underlying revision storage object A revlog consists of two parts, an index and the revision data. The index is a file with a fixed record size containing information on each revision, including its nodeid (hash), the nodeids of its parents, the position and offset of its data within the data file, and the revision it's based on. Finally, each entry contains a linkrev entry that can serve as a pointer to external data. The revision data itself is a linear collection of data chunks. Each chunk represents a revision and is usually represented as a delta against the previous chunk. To bound lookup time, runs of deltas are limited to about 2 times the length of the original version data. This makes retrieval of a version proportional to its size, or O(1) relative to the number of revisions. Both pieces of the revlog are written to in an append-only fashion, which means we never need to rewrite a file to insert or remove data, and can use some simple techniques to avoid the need for locking while reading. If checkambig, indexfile is opened with checkambig=True at writing, to avoid file stat ambiguity. If mmaplargeindex is True, and an mmapindexthreshold is set, the index will be mmapped rather than read if it is larger than the configured threshold. If censorable is True, the revlog can have censored revisions. If `upperboundcomp` is not None, this is the expected maximal gain from compression for the data content. `concurrencychecker` is an optional function that receives 3 arguments: a file handle, a filename, and an expected position. It should check whether the current position in the file handle is valid, and log/warn/fail (by raising). See mercurial/revlogutils/contants.py for details about the content of an index entry. """ _flagserrorclass = error.RevlogError @staticmethod def is_inline_index(header_bytes): """Determine if a revlog is inline from the initial bytes of the index""" header = INDEX_HEADER.unpack(header_bytes)[0] _format_flags = header & ~0xFFFF _format_version = header & 0xFFFF features = FEATURES_BY_VERSION[_format_version] return features[b'inline'](_format_flags) def __init__( self, opener, target, radix, postfix=None, # only exist for `tmpcensored` now checkambig=False, mmaplargeindex=False, censorable=False, upperboundcomp=None, persistentnodemap=False, concurrencychecker=None, trypending=False, try_split=False, canonical_parent_order=True, ): """ create a revlog object opener is a function that abstracts the file opening operation and can be used to implement COW semantics or the like. `target`: a (KIND, ID) tuple that identify the content stored in this revlog. It help the rest of the code to understand what the revlog is about without having to resort to heuristic and index filename analysis. Note: that this must be reliably be set by normal code, but that test, debug, or performance measurement code might not set this to accurate value. """ self.upperboundcomp = upperboundcomp self.radix = radix self._docket_file = None self._indexfile = None self._datafile = None self._sidedatafile = None self._nodemap_file = None self.postfix = postfix self._trypending = trypending self._try_split = try_split self.opener = opener if persistentnodemap: self._nodemap_file = nodemaputil.get_nodemap_file(self) assert target[0] in ALL_KINDS assert len(target) == 2 self.target = target # When True, indexfile is opened with checkambig=True at writing, to # avoid file stat ambiguity. self._checkambig = checkambig self._mmaplargeindex = mmaplargeindex self._censorable = censorable # 3-tuple of (node, rev, text) for a raw revision. self._revisioncache = None # Maps rev to chain base rev. self._chainbasecache = util.lrucachedict(100) # 2-tuple of (offset, data) of raw data from the revlog at an offset. self._chunkcache = (0, b'') # How much data to read and cache into the raw revlog data cache. self._chunkcachesize = 65536 self._maxchainlen = None self._deltabothparents = True self._candidate_group_chunk_size = 0 self._debug_delta = False self.index = None self._docket = None self._nodemap_docket = None # Mapping of partial identifiers to full nodes. self._pcache = {} # Mapping of revision integer to full node. self._compengine = b'zlib' self._compengineopts = {} self._maxdeltachainspan = -1 self._withsparseread = False self._sparserevlog = False self.hassidedata = False self._srdensitythreshold = 0.50 self._srmingapsize = 262144 # other optionnals features # might remove rank configuration once the computation has no impact self._compute_rank = False # Make copy of flag processors so each revlog instance can support # custom flags. self._flagprocessors = dict(flagutil.flagprocessors) # 3-tuple of file handles being used for active writing. self._writinghandles = None # prevent nesting of addgroup self._adding_group = None self._loadindex() self._concurrencychecker = concurrencychecker # parent order is supposed to be semantically irrelevant, so we # normally resort parents to ensure that the first parent is non-null, # if there is a non-null parent at all. # filelog abuses the parent order as flag to mark some instances of # meta-encoded files, so allow it to disable this behavior. self.canonical_parent_order = canonical_parent_order def _init_opts(self): """process options (from above/config) to setup associated default revlog mode These values might be affected when actually reading on disk information. The relevant values are returned for use in _loadindex(). * newversionflags: version header to use if we need to create a new revlog * mmapindexthreshold: minimal index size for start to use mmap * force_nodemap: force the usage of a "development" version of the nodemap code """ mmapindexthreshold = None opts = self.opener.options if b'changelogv2' in opts and self.revlog_kind == KIND_CHANGELOG: new_header = CHANGELOGV2 self._compute_rank = opts.get(b'changelogv2.compute-rank', True) elif b'revlogv2' in opts: new_header = REVLOGV2 elif b'revlogv1' in opts: new_header = REVLOGV1 | FLAG_INLINE_DATA if b'generaldelta' in opts: new_header |= FLAG_GENERALDELTA elif b'revlogv0' in self.opener.options: new_header = REVLOGV0 else: new_header = REVLOG_DEFAULT_VERSION if b'chunkcachesize' in opts: self._chunkcachesize = opts[b'chunkcachesize'] if b'maxchainlen' in opts: self._maxchainlen = opts[b'maxchainlen'] if b'deltabothparents' in opts: self._deltabothparents = opts[b'deltabothparents'] dps_cgds = opts.get(b'delta-parent-search.candidate-group-chunk-size') if dps_cgds: self._candidate_group_chunk_size = dps_cgds self._lazydelta = bool(opts.get(b'lazydelta', True)) self._lazydeltabase = False if self._lazydelta: self._lazydeltabase = bool(opts.get(b'lazydeltabase', False)) if b'debug-delta' in opts: self._debug_delta = opts[b'debug-delta'] if b'compengine' in opts: self._compengine = opts[b'compengine'] if b'zlib.level' in opts: self._compengineopts[b'zlib.level'] = opts[b'zlib.level'] if b'zstd.level' in opts: self._compengineopts[b'zstd.level'] = opts[b'zstd.level'] if b'maxdeltachainspan' in opts: self._maxdeltachainspan = opts[b'maxdeltachainspan'] if self._mmaplargeindex and b'mmapindexthreshold' in opts: mmapindexthreshold = opts[b'mmapindexthreshold'] self._sparserevlog = bool(opts.get(b'sparse-revlog', False)) withsparseread = bool(opts.get(b'with-sparse-read', False)) # sparse-revlog forces sparse-read self._withsparseread = self._sparserevlog or withsparseread if b'sparse-read-density-threshold' in opts: self._srdensitythreshold = opts[b'sparse-read-density-threshold'] if b'sparse-read-min-gap-size' in opts: self._srmingapsize = opts[b'sparse-read-min-gap-size'] if opts.get(b'enableellipsis'): self._flagprocessors[REVIDX_ELLIPSIS] = ellipsisprocessor # revlog v0 doesn't have flag processors for flag, processor in opts.get(b'flagprocessors', {}).items(): flagutil.insertflagprocessor(flag, processor, self._flagprocessors) if self._chunkcachesize <= 0: raise error.RevlogError( _(b'revlog chunk cache size %r is not greater than 0') % self._chunkcachesize ) elif self._chunkcachesize & (self._chunkcachesize - 1): raise error.RevlogError( _(b'revlog chunk cache size %r is not a power of 2') % self._chunkcachesize ) force_nodemap = opts.get(b'devel-force-nodemap', False) return new_header, mmapindexthreshold, force_nodemap def _get_data(self, filepath, mmap_threshold, size=None): """return a file content with or without mmap If the file is missing return the empty string""" try: with self.opener(filepath) as fp: if mmap_threshold is not None: file_size = self.opener.fstat(fp).st_size if file_size >= mmap_threshold: if size is not None: # avoid potentiel mmap crash size = min(file_size, size) # TODO: should .close() to release resources without # relying on Python GC if size is None: return util.buffer(util.mmapread(fp)) else: return util.buffer(util.mmapread(fp, size)) if size is None: return fp.read() else: return fp.read(size) except FileNotFoundError: return b'' def get_streams(self, max_linkrev, force_inline=False): """return a list of streams that represent this revlog This is used by stream-clone to do bytes to bytes copies of a repository. This streams data for all revisions that refer to a changelog revision up to `max_linkrev`. If `force_inline` is set, it enforces that the stream will represent an inline revlog. It returns is a list of three-tuple: [ (filename, bytes_stream, stream_size), … ] """ n = len(self) index = self.index while n > 0: linkrev = index[n - 1][4] if linkrev < max_linkrev: break # note: this loop will rarely go through multiple iterations, since # it only traverses commits created during the current streaming # pull operation. # # If this become a problem, using a binary search should cap the # runtime of this. n = n - 1 if n == 0: # no data to send return [] index_size = n * index.entry_size data_size = self.end(n - 1) # XXX we might have been split (or stripped) since the object # initialization, We need to close this race too, but having a way to # pre-open the file we feed to the revlog and never closing them before # we are done streaming. if self._inline: def get_stream(): with self._indexfp() as fp: yield None size = index_size + data_size if size <= 65536: yield fp.read(size) else: yield from util.filechunkiter(fp, limit=size) inline_stream = get_stream() next(inline_stream) return [ (self._indexfile, inline_stream, index_size + data_size), ] elif force_inline: def get_stream(): with self.reading(): yield None for rev in range(n): idx = self.index.entry_binary(rev) if rev == 0 and self._docket is None: # re-inject the inline flag header = self._format_flags header |= self._format_version header |= FLAG_INLINE_DATA header = self.index.pack_header(header) idx = header + idx yield idx yield self._getsegmentforrevs(rev, rev)[1] inline_stream = get_stream() next(inline_stream) return [ (self._indexfile, inline_stream, index_size + data_size), ] else: def get_index_stream(): with self._indexfp() as fp: yield None if index_size <= 65536: yield fp.read(index_size) else: yield from util.filechunkiter(fp, limit=index_size) def get_data_stream(): with self._datafp() as fp: yield None if data_size <= 65536: yield fp.read(data_size) else: yield from util.filechunkiter(fp, limit=data_size) index_stream = get_index_stream() next(index_stream) data_stream = get_data_stream() next(data_stream) return [ (self._datafile, data_stream, data_size), (self._indexfile, index_stream, index_size), ] def _loadindex(self, docket=None): new_header, mmapindexthreshold, force_nodemap = self._init_opts() if self.postfix is not None: entry_point = b'%s.i.%s' % (self.radix, self.postfix) elif self._trypending and self.opener.exists(b'%s.i.a' % self.radix): entry_point = b'%s.i.a' % self.radix elif self._try_split and self.opener.exists(self._split_index_file): entry_point = self._split_index_file else: entry_point = b'%s.i' % self.radix if docket is not None: self._docket = docket self._docket_file = entry_point else: self._initempty = True entry_data = self._get_data(entry_point, mmapindexthreshold) if len(entry_data) > 0: header = INDEX_HEADER.unpack(entry_data[:4])[0] self._initempty = False else: header = new_header self._format_flags = header & ~0xFFFF self._format_version = header & 0xFFFF supported_flags = SUPPORTED_FLAGS.get(self._format_version) if supported_flags is None: msg = _(b'unknown version (%d) in revlog %s') msg %= (self._format_version, self.display_id) raise error.RevlogError(msg) elif self._format_flags & ~supported_flags: msg = _(b'unknown flags (%#04x) in version %d revlog %s') display_flag = self._format_flags >> 16 msg %= (display_flag, self._format_version, self.display_id) raise error.RevlogError(msg) features = FEATURES_BY_VERSION[self._format_version] self._inline = features[b'inline'](self._format_flags) self._generaldelta = features[b'generaldelta'](self._format_flags) self.hassidedata = features[b'sidedata'] if not features[b'docket']: self._indexfile = entry_point index_data = entry_data else: self._docket_file = entry_point if self._initempty: self._docket = docketutil.default_docket(self, header) else: self._docket = docketutil.parse_docket( self, entry_data, use_pending=self._trypending ) if self._docket is not None: self._indexfile = self._docket.index_filepath() index_data = b'' index_size = self._docket.index_end if index_size > 0: index_data = self._get_data( self._indexfile, mmapindexthreshold, size=index_size ) if len(index_data) < index_size: msg = _(b'too few index data for %s: got %d, expected %d') msg %= (self.display_id, len(index_data), index_size) raise error.RevlogError(msg) self._inline = False # generaldelta implied by version 2 revlogs. self._generaldelta = True # the logic for persistent nodemap will be dealt with within the # main docket, so disable it for now. self._nodemap_file = None if self._docket is not None: self._datafile = self._docket.data_filepath() self._sidedatafile = self._docket.sidedata_filepath() elif self.postfix is None: self._datafile = b'%s.d' % self.radix else: self._datafile = b'%s.d.%s' % (self.radix, self.postfix) self.nodeconstants = sha1nodeconstants self.nullid = self.nodeconstants.nullid # sparse-revlog can't be on without general-delta (issue6056) if not self._generaldelta: self._sparserevlog = False self._storedeltachains = True devel_nodemap = ( self._nodemap_file and force_nodemap and parse_index_v1_nodemap is not None ) use_rust_index = False if rustrevlog is not None: if self._nodemap_file is not None: use_rust_index = True else: use_rust_index = self.opener.options.get(b'rust.index') self._parse_index = parse_index_v1 if self._format_version == REVLOGV0: self._parse_index = revlogv0.parse_index_v0 elif self._format_version == REVLOGV2: self._parse_index = parse_index_v2 elif self._format_version == CHANGELOGV2: self._parse_index = parse_index_cl_v2 elif devel_nodemap: self._parse_index = parse_index_v1_nodemap elif use_rust_index: self._parse_index = parse_index_v1_mixed try: d = self._parse_index(index_data, self._inline) index, chunkcache = d use_nodemap = ( not self._inline and self._nodemap_file is not None and hasattr(index, 'update_nodemap_data') ) if use_nodemap: nodemap_data = nodemaputil.persisted_data(self) if nodemap_data is not None: docket = nodemap_data[0] if ( len(d[0]) > docket.tip_rev and d[0][docket.tip_rev][7] == docket.tip_node ): # no changelog tampering self._nodemap_docket = docket index.update_nodemap_data(*nodemap_data) except (ValueError, IndexError): raise error.RevlogError( _(b"index %s is corrupted") % self.display_id ) self.index = index self._segmentfile = randomaccessfile.randomaccessfile( self.opener, (self._indexfile if self._inline else self._datafile), self._chunkcachesize, chunkcache, ) self._segmentfile_sidedata = randomaccessfile.randomaccessfile( self.opener, self._sidedatafile, self._chunkcachesize, ) # revnum -> (chain-length, sum-delta-length) self._chaininfocache = util.lrucachedict(500) # revlog header -> revlog compressor self._decompressors = {} def get_revlog(self): """simple function to mirror API of other not-really-revlog API""" return self @util.propertycache def revlog_kind(self): return self.target[0] @util.propertycache def display_id(self): """The public facing "ID" of the revlog that we use in message""" if self.revlog_kind == KIND_FILELOG: # Reference the file without the "data/" prefix, so it is familiar # to the user. return self.target[1] else: return self.radix def _get_decompressor(self, t): try: compressor = self._decompressors[t] except KeyError: try: engine = util.compengines.forrevlogheader(t) compressor = engine.revlogcompressor(self._compengineopts) self._decompressors[t] = compressor except KeyError: raise error.RevlogError( _(b'unknown compression type %s') % binascii.hexlify(t) ) return compressor @util.propertycache def _compressor(self): engine = util.compengines[self._compengine] return engine.revlogcompressor(self._compengineopts) @util.propertycache def _decompressor(self): """the default decompressor""" if self._docket is None: return None t = self._docket.default_compression_header c = self._get_decompressor(t) return c.decompress def _indexfp(self): """file object for the revlog's index file""" return self.opener(self._indexfile, mode=b"r") def __index_write_fp(self): # You should not use this directly and use `_writing` instead try: f = self.opener( self._indexfile, mode=b"r+", checkambig=self._checkambig ) if self._docket is None: f.seek(0, os.SEEK_END) else: f.seek(self._docket.index_end, os.SEEK_SET) return f except FileNotFoundError: return self.opener( self._indexfile, mode=b"w+", checkambig=self._checkambig ) def __index_new_fp(self): # You should not use this unless you are upgrading from inline revlog return self.opener( self._indexfile, mode=b"w", checkambig=self._checkambig, atomictemp=True, ) def _datafp(self, mode=b'r'): """file object for the revlog's data file""" return self.opener(self._datafile, mode=mode) @contextlib.contextmanager def _sidedatareadfp(self): """file object suitable to read sidedata""" if self._writinghandles: yield self._writinghandles[2] else: with self.opener(self._sidedatafile) as fp: yield fp def tiprev(self): return len(self.index) - 1 def tip(self): return self.node(self.tiprev()) def __contains__(self, rev): return 0 <= rev < len(self) def __len__(self): return len(self.index) def __iter__(self): return iter(range(len(self))) def revs(self, start=0, stop=None): """iterate over all rev in this revlog (from start to stop)""" return storageutil.iterrevs(len(self), start=start, stop=stop) def hasnode(self, node): try: self.rev(node) return True except KeyError: return False def _candelta(self, baserev, rev): """whether two revisions (baserev, rev) can be delta-ed or not""" # Disable delta if either rev requires a content-changing flag # processor (ex. LFS). This is because such flag processor can alter # the rawtext content that the delta will be based on, and two clients # could have a same revlog node with different flags (i.e. different # rawtext contents) and the delta could be incompatible. if (self.flags(baserev) & REVIDX_RAWTEXT_CHANGING_FLAGS) or ( self.flags(rev) & REVIDX_RAWTEXT_CHANGING_FLAGS ): return False return True def update_caches(self, transaction): """update on disk cache If a transaction is passed, the update may be delayed to transaction commit.""" if self._nodemap_file is not None: if transaction is None: nodemaputil.update_persistent_nodemap(self) else: nodemaputil.setup_persistent_nodemap(transaction, self) def clearcaches(self): """Clear in-memory caches""" self._revisioncache = None self._chainbasecache.clear() self._segmentfile.clear_cache() self._segmentfile_sidedata.clear_cache() self._pcache = {} self._nodemap_docket = None self.index.clearcaches() # The python code is the one responsible for validating the docket, we # end up having to refresh it here. use_nodemap = ( not self._inline and self._nodemap_file is not None and hasattr(self.index, 'update_nodemap_data') ) if use_nodemap: nodemap_data = nodemaputil.persisted_data(self) if nodemap_data is not None: self._nodemap_docket = nodemap_data[0] self.index.update_nodemap_data(*nodemap_data) def rev(self, node): """return the revision number associated with a <nodeid>""" try: return self.index.rev(node) except TypeError: raise except error.RevlogError: # parsers.c radix tree lookup failed if ( node == self.nodeconstants.wdirid or node in self.nodeconstants.wdirfilenodeids ): raise error.WdirUnsupported raise error.LookupError(node, self.display_id, _(b'no node')) # Accessors for index entries. # First tuple entry is 8 bytes. First 6 bytes are offset. Last 2 bytes # are flags. def start(self, rev): return int(self.index[rev][0] >> 16) def sidedata_cut_off(self, rev): sd_cut_off = self.index[rev][8] if sd_cut_off != 0: return sd_cut_off # This is some annoying dance, because entries without sidedata # currently use 0 as their ofsset. (instead of previous-offset + # previous-size) # # We should reconsider this sidedata → 0 sidata_offset policy. # In the meantime, we need this. while 0 <= rev: e = self.index[rev] if e[9] != 0: return e[8] + e[9] rev -= 1 return 0 def flags(self, rev): return self.index[rev][0] & 0xFFFF def length(self, rev): return self.index[rev][1] def sidedata_length(self, rev): if not self.hassidedata: return 0 return self.index[rev][9] def rawsize(self, rev): """return the length of the uncompressed text for a given revision""" l = self.index[rev][2] if l >= 0: return l t = self.rawdata(rev) return len(t) def size(self, rev): """length of non-raw text (processed by a "read" flag processor)""" # fast path: if no "read" flag processor could change the content, # size is rawsize. note: ELLIPSIS is known to not change the content. flags = self.flags(rev) if flags & (flagutil.REVIDX_KNOWN_FLAGS ^ REVIDX_ELLIPSIS) == 0: return self.rawsize(rev) return len(self.revision(rev)) def fast_rank(self, rev): """Return the rank of a revision if already known, or None otherwise. The rank of a revision is the size of the sub-graph it defines as a head. Equivalently, the rank of a revision `r` is the size of the set `ancestors(r)`, `r` included. This method returns the rank retrieved from the revlog in constant time. It makes no attempt at computing unknown values for versions of the revlog which do not persist the rank. """ rank = self.index[rev][ENTRY_RANK] if self._format_version != CHANGELOGV2 or rank == RANK_UNKNOWN: return None if rev == nullrev: return 0 # convention return rank def chainbase(self, rev): base = self._chainbasecache.get(rev) if base is not None: return base index = self.index iterrev = rev base = index[iterrev][3] while base != iterrev: iterrev = base base = index[iterrev][3] self._chainbasecache[rev] = base return base def linkrev(self, rev): return self.index[rev][4] def parentrevs(self, rev): try: entry = self.index[rev] except IndexError: if rev == wdirrev: raise error.WdirUnsupported raise if self.canonical_parent_order and entry[5] == nullrev: return entry[6], entry[5] else: return entry[5], entry[6] # fast parentrevs(rev) where rev isn't filtered _uncheckedparentrevs = parentrevs def node(self, rev): try: return self.index[rev][7] except IndexError: if rev == wdirrev: raise error.WdirUnsupported raise # Derived from index values. def end(self, rev): return self.start(rev) + self.length(rev) def parents(self, node): i = self.index d = i[self.rev(node)] # inline node() to avoid function call overhead if self.canonical_parent_order and d[5] == self.nullid: return i[d[6]][7], i[d[5]][7] else: return i[d[5]][7], i[d[6]][7] def chainlen(self, rev): return self._chaininfo(rev)[0] def _chaininfo(self, rev): chaininfocache = self._chaininfocache if rev in chaininfocache: return chaininfocache[rev] index = self.index generaldelta = self._generaldelta iterrev = rev e = index[iterrev] clen = 0 compresseddeltalen = 0 while iterrev != e[3]: clen += 1 compresseddeltalen += e[1] if generaldelta: iterrev = e[3] else: iterrev -= 1 if iterrev in chaininfocache: t = chaininfocache[iterrev] clen += t[0] compresseddeltalen += t[1] break e = index[iterrev] else: # Add text length of base since decompressing that also takes # work. For cache hits the length is already included. compresseddeltalen += e[1] r = (clen, compresseddeltalen) chaininfocache[rev] = r return r def _deltachain(self, rev, stoprev=None): """Obtain the delta chain for a revision. ``stoprev`` specifies a revision to stop at. If not specified, we stop at the base of the chain. Returns a 2-tuple of (chain, stopped) where ``chain`` is a list of revs in ascending order and ``stopped`` is a bool indicating whether ``stoprev`` was hit. """ # Try C implementation. try: return self.index.deltachain(rev, stoprev, self._generaldelta) except AttributeError: pass chain = [] # Alias to prevent attribute lookup in tight loop. index = self.index generaldelta = self._generaldelta iterrev = rev e = index[iterrev] while iterrev != e[3] and iterrev != stoprev: chain.append(iterrev) if generaldelta: iterrev = e[3] else: iterrev -= 1 e = index[iterrev] if iterrev == stoprev: stopped = True else: chain.append(iterrev) stopped = False chain.reverse() return chain, stopped def ancestors(self, revs, stoprev=0, inclusive=False): """Generate the ancestors of 'revs' in reverse revision order. Does not generate revs lower than stoprev. See the documentation for ancestor.lazyancestors for more details.""" # first, make sure start revisions aren't filtered revs = list(revs) checkrev = self.node for r in revs: checkrev(r) # and we're sure ancestors aren't filtered as well if rustancestor is not None and self.index.rust_ext_compat: lazyancestors = rustancestor.LazyAncestors arg = self.index else: lazyancestors = ancestor.lazyancestors arg = self._uncheckedparentrevs return lazyancestors(arg, revs, stoprev=stoprev, inclusive=inclusive) def descendants(self, revs): return dagop.descendantrevs(revs, self.revs, self.parentrevs) def findcommonmissing(self, common=None, heads=None): """Return a tuple of the ancestors of common and the ancestors of heads that are not ancestors of common. In revset terminology, we return the tuple: ::common, (::heads) - (::common) The list is sorted by revision number, meaning it is topologically sorted. 'heads' and 'common' are both lists of node IDs. If heads is not supplied, uses all of the revlog's heads. If common is not supplied, uses nullid.""" if common is None: common = [self.nullid] if heads is None: heads = self.heads() common = [self.rev(n) for n in common] heads = [self.rev(n) for n in heads] # we want the ancestors, but inclusive class lazyset: def __init__(self, lazyvalues): self.addedvalues = set() self.lazyvalues = lazyvalues def __contains__(self, value): return value in self.addedvalues or value in self.lazyvalues def __iter__(self): added = self.addedvalues for r in added: yield r for r in self.lazyvalues: if not r in added: yield r def add(self, value): self.addedvalues.add(value) def update(self, values): self.addedvalues.update(values) has = lazyset(self.ancestors(common)) has.add(nullrev) has.update(common) # take all ancestors from heads that aren't in has missing = set() visit = collections.deque(r for r in heads if r not in has) while visit: r = visit.popleft() if r in missing: continue else: missing.add(r) for p in self.parentrevs(r): if p not in has: visit.append(p) missing = list(missing) missing.sort() return has, [self.node(miss) for miss in missing] def incrementalmissingrevs(self, common=None): """Return an object that can be used to incrementally compute the revision numbers of the ancestors of arbitrary sets that are not ancestors of common. This is an ancestor.incrementalmissingancestors object. 'common' is a list of revision numbers. If common is not supplied, uses nullrev. """ if common is None: common = [nullrev] if rustancestor is not None and self.index.rust_ext_compat: return rustancestor.MissingAncestors(self.index, common) return ancestor.incrementalmissingancestors(self.parentrevs, common) def findmissingrevs(self, common=None, heads=None): """Return the revision numbers of the ancestors of heads that are not ancestors of common. More specifically, return a list of revision numbers corresponding to nodes N such that every N satisfies the following constraints: 1. N is an ancestor of some node in 'heads' 2. N is not an ancestor of any node in 'common' The list is sorted by revision number, meaning it is topologically sorted. 'heads' and 'common' are both lists of revision numbers. If heads is not supplied, uses all of the revlog's heads. If common is not supplied, uses nullid.""" if common is None: common = [nullrev] if heads is None: heads = self.headrevs() inc = self.incrementalmissingrevs(common=common) return inc.missingancestors(heads) def findmissing(self, common=None, heads=None): """Return the ancestors of heads that are not ancestors of common. More specifically, return a list of nodes N such that every N satisfies the following constraints: 1. N is an ancestor of some node in 'heads' 2. N is not an ancestor of any node in 'common' The list is sorted by revision number, meaning it is topologically sorted. 'heads' and 'common' are both lists of node IDs. If heads is not supplied, uses all of the revlog's heads. If common is not supplied, uses nullid.""" if common is None: common = [self.nullid] if heads is None: heads = self.heads() common = [self.rev(n) for n in common] heads = [self.rev(n) for n in heads] inc = self.incrementalmissingrevs(common=common) return [self.node(r) for r in inc.missingancestors(heads)] def nodesbetween(self, roots=None, heads=None): """Return a topological path from 'roots' to 'heads'. Return a tuple (nodes, outroots, outheads) where 'nodes' is a topologically sorted list of all nodes N that satisfy both of these constraints: 1. N is a descendant of some node in 'roots' 2. N is an ancestor of some node in 'heads' Every node is considered to be both a descendant and an ancestor of itself, so every reachable node in 'roots' and 'heads' will be included in 'nodes'. 'outroots' is the list of reachable nodes in 'roots', i.e., the subset of 'roots' that is returned in 'nodes'. Likewise, 'outheads' is the subset of 'heads' that is also in 'nodes'. 'roots' and 'heads' are both lists of node IDs. If 'roots' is unspecified, uses nullid as the only root. If 'heads' is unspecified, uses list of all of the revlog's heads.""" nonodes = ([], [], []) if roots is not None: roots = list(roots) if not roots: return nonodes lowestrev = min([self.rev(n) for n in roots]) else: roots = [self.nullid] # Everybody's a descendant of nullid lowestrev = nullrev if (lowestrev == nullrev) and (heads is None): # We want _all_ the nodes! return ( [self.node(r) for r in self], [self.nullid], list(self.heads()), ) if heads is None: # All nodes are ancestors, so the latest ancestor is the last # node. highestrev = len(self) - 1 # Set ancestors to None to signal that every node is an ancestor. ancestors = None # Set heads to an empty dictionary for later discovery of heads heads = {} else: heads = list(heads) if not heads: return nonodes ancestors = set() # Turn heads into a dictionary so we can remove 'fake' heads. # Also, later we will be using it to filter out the heads we can't # find from roots. heads = dict.fromkeys(heads, False) # Start at the top and keep marking parents until we're done. nodestotag = set(heads) # Remember where the top was so we can use it as a limit later. highestrev = max([self.rev(n) for n in nodestotag]) while nodestotag: # grab a node to tag n = nodestotag.pop() # Never tag nullid if n == self.nullid: continue # A node's revision number represents its place in a # topologically sorted list of nodes. r = self.rev(n) if r >= lowestrev: if n not in ancestors: # If we are possibly a descendant of one of the roots # and we haven't already been marked as an ancestor ancestors.add(n) # Mark as ancestor # Add non-nullid parents to list of nodes to tag. nodestotag.update( [p for p in self.parents(n) if p != self.nullid] ) elif n in heads: # We've seen it before, is it a fake head? # So it is, real heads should not be the ancestors of # any other heads. heads.pop(n) if not ancestors: return nonodes # Now that we have our set of ancestors, we want to remove any # roots that are not ancestors. # If one of the roots was nullid, everything is included anyway. if lowestrev > nullrev: # But, since we weren't, let's recompute the lowest rev to not # include roots that aren't ancestors. # Filter out roots that aren't ancestors of heads roots = [root for root in roots if root in ancestors] # Recompute the lowest revision if roots: lowestrev = min([self.rev(root) for root in roots]) else: # No more roots? Return empty list return nonodes else: # We are descending from nullid, and don't need to care about # any other roots. lowestrev = nullrev roots = [self.nullid] # Transform our roots list into a set. descendants = set(roots) # Also, keep the original roots so we can filter out roots that aren't # 'real' roots (i.e. are descended from other roots). roots = descendants.copy() # Our topologically sorted list of output nodes. orderedout = [] # Don't start at nullid since we don't want nullid in our output list, # and if nullid shows up in descendants, empty parents will look like # they're descendants. for r in self.revs(start=max(lowestrev, 0), stop=highestrev + 1): n = self.node(r) isdescendant = False if lowestrev == nullrev: # Everybody is a descendant of nullid isdescendant = True elif n in descendants: # n is already a descendant isdescendant = True # This check only needs to be done here because all the roots # will start being marked is descendants before the loop. if n in roots: # If n was a root, check if it's a 'real' root. p = tuple(self.parents(n)) # If any of its parents are descendants, it's not a root. if (p[0] in descendants) or (p[1] in descendants): roots.remove(n) else: p = tuple(self.parents(n)) # A node is a descendant if either of its parents are # descendants. (We seeded the dependents list with the roots # up there, remember?) if (p[0] in descendants) or (p[1] in descendants): descendants.add(n) isdescendant = True if isdescendant and ((ancestors is None) or (n in ancestors)): # Only include nodes that are both descendants and ancestors. orderedout.append(n) if (ancestors is not None) and (n in heads): # We're trying to figure out which heads are reachable # from roots. # Mark this head as having been reached heads[n] = True elif ancestors is None: # Otherwise, we're trying to discover the heads. # Assume this is a head because if it isn't, the next step # will eventually remove it. heads[n] = True # But, obviously its parents aren't. for p in self.parents(n): heads.pop(p, None) heads = [head for head, flag in heads.items() if flag] roots = list(roots) assert orderedout assert roots assert heads return (orderedout, roots, heads) def headrevs(self, revs=None): if revs is None: try: return self.index.headrevs() except AttributeError: return self._headrevs() if rustdagop is not None and self.index.rust_ext_compat: return rustdagop.headrevs(self.index, revs) return dagop.headrevs(revs, self._uncheckedparentrevs) def computephases(self, roots): return self.index.computephasesmapsets(roots) def _headrevs(self): count = len(self) if not count: return [nullrev] # we won't iter over filtered rev so nobody is a head at start ishead = [0] * (count + 1) index = self.index for r in self: ishead[r] = 1 # I may be an head e = index[r] ishead[e[5]] = ishead[e[6]] = 0 # my parent are not return [r for r, val in enumerate(ishead) if val] def heads(self, start=None, stop=None): """return the list of all nodes that have no children if start is specified, only heads that are descendants of start will be returned if stop is specified, it will consider all the revs from stop as if they had no children """ if start is None and stop is None: if not len(self): return [self.nullid] return [self.node(r) for r in self.headrevs()] if start is None: start = nullrev else: start = self.rev(start) stoprevs = {self.rev(n) for n in stop or []} revs = dagop.headrevssubset( self.revs, self.parentrevs, startrev=start, stoprevs=stoprevs ) return [self.node(rev) for rev in revs] def children(self, node): """find the children of a given node""" c = [] p = self.rev(node) for r in self.revs(start=p + 1): prevs = [pr for pr in self.parentrevs(r) if pr != nullrev] if prevs: for pr in prevs: if pr == p: c.append(self.node(r)) elif p == nullrev: c.append(self.node(r)) return c def commonancestorsheads(self, a, b): """calculate all the heads of the common ancestors of nodes a and b""" a, b = self.rev(a), self.rev(b) ancs = self._commonancestorsheads(a, b) return pycompat.maplist(self.node, ancs) def _commonancestorsheads(self, *revs): """calculate all the heads of the common ancestors of revs""" try: ancs = self.index.commonancestorsheads(*revs) except (AttributeError, OverflowError): # C implementation failed ancs = ancestor.commonancestorsheads(self.parentrevs, *revs) return ancs def isancestor(self, a, b): """return True if node a is an ancestor of node b A revision is considered an ancestor of itself.""" a, b = self.rev(a), self.rev(b) return self.isancestorrev(a, b) def isancestorrev(self, a, b): """return True if revision a is an ancestor of revision b A revision is considered an ancestor of itself. The implementation of this is trivial but the use of reachableroots is not.""" if a == nullrev: return True elif a == b: return True elif a > b: return False return bool(self.reachableroots(a, [b], [a], includepath=False)) def reachableroots(self, minroot, heads, roots, includepath=False): """return (heads(::(<roots> and <roots>::<heads>))) If includepath is True, return (<roots>::<heads>).""" try: return self.index.reachableroots2( minroot, heads, roots, includepath ) except AttributeError: return dagop._reachablerootspure( self.parentrevs, minroot, roots, heads, includepath ) def ancestor(self, a, b): """calculate the "best" common ancestor of nodes a and b""" a, b = self.rev(a), self.rev(b) try: ancs = self.index.ancestors(a, b) except (AttributeError, OverflowError): ancs = ancestor.ancestors(self.parentrevs, a, b) if ancs: # choose a consistent winner when there's a tie return min(map(self.node, ancs)) return self.nullid def _match(self, id): if isinstance(id, int): # rev return self.node(id) if len(id) == self.nodeconstants.nodelen: # possibly a binary node # odds of a binary node being all hex in ASCII are 1 in 10**25 try: node = id self.rev(node) # quick search the index return node except error.LookupError: pass # may be partial hex id try: # str(rev) rev = int(id) if b"%d" % rev != id: raise ValueError if rev < 0: rev = len(self) + rev if rev < 0 or rev >= len(self): raise ValueError return self.node(rev) except (ValueError, OverflowError): pass if len(id) == 2 * self.nodeconstants.nodelen: try: # a full hex nodeid? node = bin(id) self.rev(node) return node except (binascii.Error, error.LookupError): pass def _partialmatch(self, id): # we don't care wdirfilenodeids as they should be always full hash maybewdir = self.nodeconstants.wdirhex.startswith(id) ambiguous = False try: partial = self.index.partialmatch(id) if partial and self.hasnode(partial): if maybewdir: # single 'ff...' match in radix tree, ambiguous with wdir ambiguous = True else: return partial elif maybewdir: # no 'ff...' match in radix tree, wdir identified raise error.WdirUnsupported else: return None except error.RevlogError: # parsers.c radix tree lookup gave multiple matches # fast path: for unfiltered changelog, radix tree is accurate if not getattr(self, 'filteredrevs', None): ambiguous = True # fall through to slow path that filters hidden revisions except (AttributeError, ValueError): # we are pure python, or key is not hex pass if ambiguous: raise error.AmbiguousPrefixLookupError( id, self.display_id, _(b'ambiguous identifier') ) if id in self._pcache: return self._pcache[id] if len(id) <= 40: # hex(node)[:...] l = len(id) // 2 * 2 # grab an even number of digits try: # we're dropping the last digit, so let's check that it's hex, # to avoid the expensive computation below if it's not if len(id) % 2 > 0: if not (id[-1] in hexdigits): return None prefix = bin(id[:l]) except binascii.Error: pass else: nl = [e[7] for e in self.index if e[7].startswith(prefix)] nl = [ n for n in nl if hex(n).startswith(id) and self.hasnode(n) ] if self.nodeconstants.nullhex.startswith(id): nl.append(self.nullid) if len(nl) > 0: if len(nl) == 1 and not maybewdir: self._pcache[id] = nl[0] return nl[0] raise error.AmbiguousPrefixLookupError( id, self.display_id, _(b'ambiguous identifier') ) if maybewdir: raise error.WdirUnsupported return None def lookup(self, id): """locate a node based on: - revision number or str(revision number) - nodeid or subset of hex nodeid """ n = self._match(id) if n is not None: return n n = self._partialmatch(id) if n: return n raise error.LookupError(id, self.display_id, _(b'no match found')) def shortest(self, node, minlength=1): """Find the shortest unambiguous prefix that matches node.""" def isvalid(prefix): try: matchednode = self._partialmatch(prefix) except error.AmbiguousPrefixLookupError: return False except error.WdirUnsupported: # single 'ff...' match return True if matchednode is None: raise error.LookupError(node, self.display_id, _(b'no node')) return True def maybewdir(prefix): return all(c == b'f' for c in pycompat.iterbytestr(prefix)) hexnode = hex(node) def disambiguate(hexnode, minlength): """Disambiguate against wdirid.""" for length in range(minlength, len(hexnode) + 1): prefix = hexnode[:length] if not maybewdir(prefix): return prefix if not getattr(self, 'filteredrevs', None): try: length = max(self.index.shortest(node), minlength) return disambiguate(hexnode, length) except error.RevlogError: if node != self.nodeconstants.wdirid: raise error.LookupError( node, self.display_id, _(b'no node') ) except AttributeError: # Fall through to pure code pass if node == self.nodeconstants.wdirid: for length in range(minlength, len(hexnode) + 1): prefix = hexnode[:length] if isvalid(prefix): return prefix for length in range(minlength, len(hexnode) + 1): prefix = hexnode[:length] if isvalid(prefix): return disambiguate(hexnode, length) def cmp(self, node, text): """compare text with a given file revision returns True if text is different than what is stored. """ p1, p2 = self.parents(node) return storageutil.hashrevisionsha1(text, p1, p2) != node def _getsegmentforrevs(self, startrev, endrev, df=None): """Obtain a segment of raw data corresponding to a range of revisions. Accepts the start and end revisions and an optional already-open file handle to be used for reading. If the file handle is read, its seek position will not be preserved. Requests for data may be satisfied by a cache. Returns a 2-tuple of (offset, data) for the requested range of revisions. Offset is the integer offset from the beginning of the revlog and data is a str or buffer of the raw byte data. Callers will need to call ``self.start(rev)`` and ``self.length(rev)`` to determine where each revision's data begins and ends. """ # Inlined self.start(startrev) & self.end(endrev) for perf reasons # (functions are expensive). index = self.index istart = index[startrev] start = int(istart[0] >> 16) if startrev == endrev: end = start + istart[1] else: iend = index[endrev] end = int(iend[0] >> 16) + iend[1] if self._inline: start += (startrev + 1) * self.index.entry_size end += (endrev + 1) * self.index.entry_size length = end - start return start, self._segmentfile.read_chunk(start, length, df) def _chunk(self, rev, df=None): """Obtain a single decompressed chunk for a revision. Accepts an integer revision and an optional already-open file handle to be used for reading. If used, the seek position of the file will not be preserved. Returns a str holding uncompressed data for the requested revision. """ compression_mode = self.index[rev][10] data = self._getsegmentforrevs(rev, rev, df=df)[1] if compression_mode == COMP_MODE_PLAIN: return data elif compression_mode == COMP_MODE_DEFAULT: return self._decompressor(data) elif compression_mode == COMP_MODE_INLINE: return self.decompress(data) else: msg = b'unknown compression mode %d' msg %= compression_mode raise error.RevlogError(msg) def _chunks(self, revs, df=None, targetsize=None): """Obtain decompressed chunks for the specified revisions. Accepts an iterable of numeric revisions that are assumed to be in ascending order. Also accepts an optional already-open file handle to be used for reading. If used, the seek position of the file will not be preserved. This function is similar to calling ``self._chunk()`` multiple times, but is faster. Returns a list with decompressed data for each requested revision. """ if not revs: return [] start = self.start length = self.length inline = self._inline iosize = self.index.entry_size buffer = util.buffer l = [] ladd = l.append if not self._withsparseread: slicedchunks = (revs,) else: slicedchunks = deltautil.slicechunk( self, revs, targetsize=targetsize ) for revschunk in slicedchunks: firstrev = revschunk[0] # Skip trailing revisions with empty diff for lastrev in revschunk[::-1]: if length(lastrev) != 0: break try: offset, data = self._getsegmentforrevs(firstrev, lastrev, df=df) except OverflowError: # issue4215 - we can't cache a run of chunks greater than # 2G on Windows return [self._chunk(rev, df=df) for rev in revschunk] decomp = self.decompress # self._decompressor might be None, but will not be used in that case def_decomp = self._decompressor for rev in revschunk: chunkstart = start(rev) if inline: chunkstart += (rev + 1) * iosize chunklength = length(rev) comp_mode = self.index[rev][10] c = buffer(data, chunkstart - offset, chunklength) if comp_mode == COMP_MODE_PLAIN: ladd(c) elif comp_mode == COMP_MODE_INLINE: ladd(decomp(c)) elif comp_mode == COMP_MODE_DEFAULT: ladd(def_decomp(c)) else: msg = b'unknown compression mode %d' msg %= comp_mode raise error.RevlogError(msg) return l def deltaparent(self, rev): """return deltaparent of the given revision""" base = self.index[rev][3] if base == rev: return nullrev elif self._generaldelta: return base else: return rev - 1 def issnapshot(self, rev): """tells whether rev is a snapshot""" if not self._sparserevlog: return self.deltaparent(rev) == nullrev elif hasattr(self.index, 'issnapshot'): # directly assign the method to cache the testing and access self.issnapshot = self.index.issnapshot return self.issnapshot(rev) if rev == nullrev: return True entry = self.index[rev] base = entry[3] if base == rev: return True if base == nullrev: return True p1 = entry[5] while self.length(p1) == 0: b = self.deltaparent(p1) if b == p1: break p1 = b p2 = entry[6] while self.length(p2) == 0: b = self.deltaparent(p2) if b == p2: break p2 = b if base == p1 or base == p2: return False return self.issnapshot(base) def snapshotdepth(self, rev): """number of snapshot in the chain before this one""" if not self.issnapshot(rev): raise error.ProgrammingError(b'revision %d not a snapshot') return len(self._deltachain(rev)[0]) - 1 def revdiff(self, rev1, rev2): """return or calculate a delta between two revisions The delta calculated is in binary form and is intended to be written to revlog data directly. So this function needs raw revision data. """ if rev1 != nullrev and self.deltaparent(rev2) == rev1: return bytes(self._chunk(rev2)) return mdiff.textdiff(self.rawdata(rev1), self.rawdata(rev2)) def revision(self, nodeorrev): """return an uncompressed revision of a given node or revision number. """ return self._revisiondata(nodeorrev) def sidedata(self, nodeorrev): """a map of extra data related to the changeset but not part of the hash This function currently return a dictionary. However, more advanced mapping object will likely be used in the future for a more efficient/lazy code. """ # deal with <nodeorrev> argument type if isinstance(nodeorrev, int): rev = nodeorrev else: rev = self.rev(nodeorrev) return self._sidedata(rev) def _revisiondata(self, nodeorrev, _df=None, raw=False): # deal with <nodeorrev> argument type if isinstance(nodeorrev, int): rev = nodeorrev node = self.node(rev) else: node = nodeorrev rev = None # fast path the special `nullid` rev if node == self.nullid: return b"" # ``rawtext`` is the text as stored inside the revlog. Might be the # revision or might need to be processed to retrieve the revision. rev, rawtext, validated = self._rawtext(node, rev, _df=_df) if raw and validated: # if we don't want to process the raw text and that raw # text is cached, we can exit early. return rawtext if rev is None: rev = self.rev(node) # the revlog's flag for this revision # (usually alter its state or content) flags = self.flags(rev) if validated and flags == REVIDX_DEFAULT_FLAGS: # no extra flags set, no flag processor runs, text = rawtext return rawtext if raw: validatehash = flagutil.processflagsraw(self, rawtext, flags) text = rawtext else: r = flagutil.processflagsread(self, rawtext, flags) text, validatehash = r if validatehash: self.checkhash(text, node, rev=rev) if not validated: self._revisioncache = (node, rev, rawtext) return text def _rawtext(self, node, rev, _df=None): """return the possibly unvalidated rawtext for a revision returns (rev, rawtext, validated) """ # revision in the cache (could be useful to apply delta) cachedrev = None # An intermediate text to apply deltas to basetext = None # Check if we have the entry in cache # The cache entry looks like (node, rev, rawtext) if self._revisioncache: if self._revisioncache[0] == node: return (rev, self._revisioncache[2], True) cachedrev = self._revisioncache[1] if rev is None: rev = self.rev(node) chain, stopped = self._deltachain(rev, stoprev=cachedrev) if stopped: basetext = self._revisioncache[2] # drop cache to save memory, the caller is expected to # update self._revisioncache after validating the text self._revisioncache = None targetsize = None rawsize = self.index[rev][2] if 0 <= rawsize: targetsize = 4 * rawsize bins = self._chunks(chain, df=_df, targetsize=targetsize) if basetext is None: basetext = bytes(bins[0]) bins = bins[1:] rawtext = mdiff.patches(basetext, bins) del basetext # let us have a chance to free memory early return (rev, rawtext, False) def _sidedata(self, rev): """Return the sidedata for a given revision number.""" index_entry = self.index[rev] sidedata_offset = index_entry[8] sidedata_size = index_entry[9] if self._inline: sidedata_offset += self.index.entry_size * (1 + rev) if sidedata_size == 0: return {} if self._docket.sidedata_end < sidedata_offset + sidedata_size: filename = self._sidedatafile end = self._docket.sidedata_end offset = sidedata_offset length = sidedata_size m = FILE_TOO_SHORT_MSG % (filename, length, offset, end) raise error.RevlogError(m) comp_segment = self._segmentfile_sidedata.read_chunk( sidedata_offset, sidedata_size ) comp = self.index[rev][11] if comp == COMP_MODE_PLAIN: segment = comp_segment elif comp == COMP_MODE_DEFAULT: segment = self._decompressor(comp_segment) elif comp == COMP_MODE_INLINE: segment = self.decompress(comp_segment) else: msg = b'unknown compression mode %d' msg %= comp raise error.RevlogError(msg) sidedata = sidedatautil.deserialize_sidedata(segment) return sidedata def rawdata(self, nodeorrev): """return an uncompressed raw data of a given node or revision number.""" return self._revisiondata(nodeorrev, raw=True) def hash(self, text, p1, p2): """Compute a node hash. Available as a function so that subclasses can replace the hash as needed. """ return storageutil.hashrevisionsha1(text, p1, p2) def checkhash(self, text, node, p1=None, p2=None, rev=None): """Check node hash integrity. Available as a function so that subclasses can extend hash mismatch behaviors as needed. """ try: if p1 is None and p2 is None: p1, p2 = self.parents(node) if node != self.hash(text, p1, p2): # Clear the revision cache on hash failure. The revision cache # only stores the raw revision and clearing the cache does have # the side-effect that we won't have a cache hit when the raw # revision data is accessed. But this case should be rare and # it is extra work to teach the cache about the hash # verification state. if self._revisioncache and self._revisioncache[0] == node: self._revisioncache = None revornode = rev if revornode is None: revornode = templatefilters.short(hex(node)) raise error.RevlogError( _(b"integrity check failed on %s:%s") % (self.display_id, pycompat.bytestr(revornode)) ) except error.RevlogError: if self._censorable and storageutil.iscensoredtext(text): raise error.CensoredNodeError(self.display_id, node, text) raise @property def _split_index_file(self): """the path where to expect the index of an ongoing splitting operation The file will only exist if a splitting operation is in progress, but it is always expected at the same location.""" parts = self.radix.split(b'/') if len(parts) > 1: # adds a '-s' prefix to the ``data/` or `meta/` base head = parts[0] + b'-s' mids = parts[1:-1] tail = parts[-1] + b'.i' pieces = [head] + mids + [tail] return b'/'.join(pieces) else: # the revlog is stored at the root of the store (changelog or # manifest), no risk of collision. return self.radix + b'.i.s' def _enforceinlinesize(self, tr, side_write=True): """Check if the revlog is too big for inline and convert if so. This should be called after revisions are added to the revlog. If the revlog has grown too large to be an inline revlog, it will convert it to use multiple index and data files. """ tiprev = len(self) - 1 total_size = self.start(tiprev) + self.length(tiprev) if not self._inline or total_size < _maxinline: return troffset = tr.findoffset(self._indexfile) if troffset is None: raise error.RevlogError( _(b"%s not found in the transaction") % self._indexfile ) if troffset: tr.addbackup(self._indexfile, for_offset=True) tr.add(self._datafile, 0) existing_handles = False if self._writinghandles is not None: existing_handles = True fp = self._writinghandles[0] fp.flush() fp.close() # We can't use the cached file handle after close(). So prevent # its usage. self._writinghandles = None self._segmentfile.writing_handle = None # No need to deal with sidedata writing handle as it is only # relevant with revlog-v2 which is never inline, not reaching # this code if side_write: old_index_file_path = self._indexfile new_index_file_path = self._split_index_file opener = self.opener weak_self = weakref.ref(self) # the "split" index replace the real index when the transaction is finalized def finalize_callback(tr): opener.rename( new_index_file_path, old_index_file_path, checkambig=True, ) maybe_self = weak_self() if maybe_self is not None: maybe_self._indexfile = old_index_file_path def abort_callback(tr): maybe_self = weak_self() if maybe_self is not None: maybe_self._indexfile = old_index_file_path tr.registertmp(new_index_file_path) if self.target[1] is not None: callback_id = b'000-revlog-split-%d-%s' % self.target else: callback_id = b'000-revlog-split-%d' % self.target[0] tr.addfinalize(callback_id, finalize_callback) tr.addabort(callback_id, abort_callback) new_dfh = self._datafp(b'w+') new_dfh.truncate(0) # drop any potentially existing data try: with self._indexfp() as read_ifh: for r in self: new_dfh.write(self._getsegmentforrevs(r, r, df=read_ifh)[1]) new_dfh.flush() if side_write: self._indexfile = new_index_file_path with self.__index_new_fp() as fp: self._format_flags &= ~FLAG_INLINE_DATA self._inline = False for i in self: e = self.index.entry_binary(i) if i == 0 and self._docket is None: header = self._format_flags | self._format_version header = self.index.pack_header(header) e = header + e fp.write(e) if self._docket is not None: self._docket.index_end = fp.tell() # If we don't use side-write, the temp file replace the real # index when we exit the context manager nodemaputil.setup_persistent_nodemap(tr, self) self._segmentfile = randomaccessfile.randomaccessfile( self.opener, self._datafile, self._chunkcachesize, ) if existing_handles: # switched from inline to conventional reopen the index ifh = self.__index_write_fp() self._writinghandles = (ifh, new_dfh, None) self._segmentfile.writing_handle = new_dfh new_dfh = None # No need to deal with sidedata writing handle as it is only # relevant with revlog-v2 which is never inline, not reaching # this code finally: if new_dfh is not None: new_dfh.close() def _nodeduplicatecallback(self, transaction, node): """called when trying to add a node already stored.""" @contextlib.contextmanager def reading(self): """Context manager that keeps data and sidedata files open for reading""" if len(self.index) == 0: yield # nothing to be read else: with self._segmentfile.reading(): with self._segmentfile_sidedata.reading(): yield @contextlib.contextmanager def _writing(self, transaction): if self._trypending: msg = b'try to write in a `trypending` revlog: %s' msg %= self.display_id raise error.ProgrammingError(msg) if self._writinghandles is not None: yield else: ifh = dfh = sdfh = None try: r = len(self) # opening the data file. dsize = 0 if r: dsize = self.end(r - 1) dfh = None if not self._inline: try: dfh = self._datafp(b"r+") if self._docket is None: dfh.seek(0, os.SEEK_END) else: dfh.seek(self._docket.data_end, os.SEEK_SET) except FileNotFoundError: dfh = self._datafp(b"w+") transaction.add(self._datafile, dsize) if self._sidedatafile is not None: # revlog-v2 does not inline, help Pytype assert dfh is not None try: sdfh = self.opener(self._sidedatafile, mode=b"r+") dfh.seek(self._docket.sidedata_end, os.SEEK_SET) except FileNotFoundError: sdfh = self.opener(self._sidedatafile, mode=b"w+") transaction.add( self._sidedatafile, self._docket.sidedata_end ) # opening the index file. isize = r * self.index.entry_size ifh = self.__index_write_fp() if self._inline: transaction.add(self._indexfile, dsize + isize) else: transaction.add(self._indexfile, isize) # exposing all file handle for writing. self._writinghandles = (ifh, dfh, sdfh) self._segmentfile.writing_handle = ifh if self._inline else dfh self._segmentfile_sidedata.writing_handle = sdfh yield if self._docket is not None: self._write_docket(transaction) finally: self._writinghandles = None self._segmentfile.writing_handle = None self._segmentfile_sidedata.writing_handle = None if dfh is not None: dfh.close() if sdfh is not None: sdfh.close() # closing the index file last to avoid exposing referent to # potential unflushed data content. if ifh is not None: ifh.close() def _write_docket(self, transaction): """write the current docket on disk Exist as a method to help changelog to implement transaction logic We could also imagine using the same transaction logic for all revlog since docket are cheap.""" self._docket.write(transaction) def addrevision( self, text, transaction, link, p1, p2, cachedelta=None, node=None, flags=REVIDX_DEFAULT_FLAGS, deltacomputer=None, sidedata=None, ): """add a revision to the log text - the revision data to add transaction - the transaction object used for rollback link - the linkrev data to add p1, p2 - the parent nodeids of the revision cachedelta - an optional precomputed delta node - nodeid of revision; typically node is not specified, and it is computed by default as hash(text, p1, p2), however subclasses might use different hashing method (and override checkhash() in such case) flags - the known flags to set on the revision deltacomputer - an optional deltacomputer instance shared between multiple calls """ if link == nullrev: raise error.RevlogError( _(b"attempted to add linkrev -1 to %s") % self.display_id ) if sidedata is None: sidedata = {} elif sidedata and not self.hassidedata: raise error.ProgrammingError( _(b"trying to add sidedata to a revlog who don't support them") ) if flags: node = node or self.hash(text, p1, p2) rawtext, validatehash = flagutil.processflagswrite(self, text, flags) # If the flag processor modifies the revision data, ignore any provided # cachedelta. if rawtext != text: cachedelta = None if len(rawtext) > _maxentrysize: raise error.RevlogError( _( b"%s: size of %d bytes exceeds maximum revlog storage of 2GiB" ) % (self.display_id, len(rawtext)) ) node = node or self.hash(rawtext, p1, p2) rev = self.index.get_rev(node) if rev is not None: return rev if validatehash: self.checkhash(rawtext, node, p1=p1, p2=p2) return self.addrawrevision( rawtext, transaction, link, p1, p2, node, flags, cachedelta=cachedelta, deltacomputer=deltacomputer, sidedata=sidedata, ) def addrawrevision( self, rawtext, transaction, link, p1, p2, node, flags, cachedelta=None, deltacomputer=None, sidedata=None, ): """add a raw revision with known flags, node and parents useful when reusing a revision not stored in this revlog (ex: received over wire, or read from an external bundle). """ with self._writing(transaction): return self._addrevision( node, rawtext, transaction, link, p1, p2, flags, cachedelta, deltacomputer=deltacomputer, sidedata=sidedata, ) def compress(self, data): """Generate a possibly-compressed representation of data.""" if not data: return b'', data compressed = self._compressor.compress(data) if compressed: # The revlog compressor added the header in the returned data. return b'', compressed if data[0:1] == b'\0': return b'', data return b'u', data def decompress(self, data): """Decompress a revlog chunk. The chunk is expected to begin with a header identifying the format type so it can be routed to an appropriate decompressor. """ if not data: return data # Revlogs are read much more frequently than they are written and many # chunks only take microseconds to decompress, so performance is # important here. # # We can make a few assumptions about revlogs: # # 1) the majority of chunks will be compressed (as opposed to inline # raw data). # 2) decompressing *any* data will likely by at least 10x slower than # returning raw inline data. # 3) we want to prioritize common and officially supported compression # engines # # It follows that we want to optimize for "decompress compressed data # when encoded with common and officially supported compression engines" # case over "raw data" and "data encoded by less common or non-official # compression engines." That is why we have the inline lookup first # followed by the compengines lookup. # # According to `hg perfrevlogchunks`, this is ~0.5% faster for zlib # compressed chunks. And this matters for changelog and manifest reads. t = data[0:1] if t == b'x': try: return _zlibdecompress(data) except zlib.error as e: raise error.RevlogError( _(b'revlog decompress error: %s') % stringutil.forcebytestr(e) ) # '\0' is more common than 'u' so it goes first. elif t == b'\0': return data elif t == b'u': return util.buffer(data, 1) compressor = self._get_decompressor(t) return compressor.decompress(data) def _addrevision( self, node, rawtext, transaction, link, p1, p2, flags, cachedelta, alwayscache=False, deltacomputer=None, sidedata=None, ): """internal function to add revisions to the log see addrevision for argument descriptions. note: "addrevision" takes non-raw text, "_addrevision" takes raw text. if "deltacomputer" is not provided or None, a defaultdeltacomputer will be used. invariants: - rawtext is optional (can be None); if not set, cachedelta must be set. if both are set, they must correspond to each other. """ if node == self.nullid: raise error.RevlogError( _(b"%s: attempt to add null revision") % self.display_id ) if ( node == self.nodeconstants.wdirid or node in self.nodeconstants.wdirfilenodeids ): raise error.RevlogError( _(b"%s: attempt to add wdir revision") % self.display_id ) if self._writinghandles is None: msg = b'adding revision outside `revlog._writing` context' raise error.ProgrammingError(msg) btext = [rawtext] curr = len(self) prev = curr - 1 offset = self._get_data_offset(prev) if self._concurrencychecker: ifh, dfh, sdfh = self._writinghandles # XXX no checking for the sidedata file if self._inline: # offset is "as if" it were in the .d file, so we need to add on # the size of the entry metadata. self._concurrencychecker( ifh, self._indexfile, offset + curr * self.index.entry_size ) else: # Entries in the .i are a consistent size. self._concurrencychecker( ifh, self._indexfile, curr * self.index.entry_size ) self._concurrencychecker(dfh, self._datafile, offset) p1r, p2r = self.rev(p1), self.rev(p2) # full versions are inserted when the needed deltas # become comparable to the uncompressed text if rawtext is None: # need rawtext size, before changed by flag processors, which is # the non-raw size. use revlog explicitly to avoid filelog's extra # logic that might remove metadata size. textlen = mdiff.patchedsize( revlog.size(self, cachedelta[0]), cachedelta[1] ) else: textlen = len(rawtext) if deltacomputer is None: write_debug = None if self._debug_delta: write_debug = transaction._report deltacomputer = deltautil.deltacomputer( self, write_debug=write_debug ) if cachedelta is not None and len(cachedelta) == 2: # If the cached delta has no information about how it should be # reused, add the default reuse instruction according to the # revlog's configuration. if self._generaldelta and self._lazydeltabase: delta_base_reuse = DELTA_BASE_REUSE_TRY else: delta_base_reuse = DELTA_BASE_REUSE_NO cachedelta = (cachedelta[0], cachedelta[1], delta_base_reuse) revinfo = revlogutils.revisioninfo( node, p1, p2, btext, textlen, cachedelta, flags, ) deltainfo = deltacomputer.finddeltainfo(revinfo) compression_mode = COMP_MODE_INLINE if self._docket is not None: default_comp = self._docket.default_compression_header r = deltautil.delta_compression(default_comp, deltainfo) compression_mode, deltainfo = r sidedata_compression_mode = COMP_MODE_INLINE if sidedata and self.hassidedata: sidedata_compression_mode = COMP_MODE_PLAIN serialized_sidedata = sidedatautil.serialize_sidedata(sidedata) sidedata_offset = self._docket.sidedata_end h, comp_sidedata = self.compress(serialized_sidedata) if ( h != b'u' and comp_sidedata[0:1] != b'\0' and len(comp_sidedata) < len(serialized_sidedata) ): assert not h if ( comp_sidedata[0:1] == self._docket.default_compression_header ): sidedata_compression_mode = COMP_MODE_DEFAULT serialized_sidedata = comp_sidedata else: sidedata_compression_mode = COMP_MODE_INLINE serialized_sidedata = comp_sidedata else: serialized_sidedata = b"" # Don't store the offset if the sidedata is empty, that way # we can easily detect empty sidedata and they will be no different # than ones we manually add. sidedata_offset = 0 rank = RANK_UNKNOWN if self._compute_rank: if (p1r, p2r) == (nullrev, nullrev): rank = 1 elif p1r != nullrev and p2r == nullrev: rank = 1 + self.fast_rank(p1r) elif p1r == nullrev and p2r != nullrev: rank = 1 + self.fast_rank(p2r) else: # merge node if rustdagop is not None and self.index.rust_ext_compat: rank = rustdagop.rank(self.index, p1r, p2r) else: pmin, pmax = sorted((p1r, p2r)) rank = 1 + self.fast_rank(pmax) rank += sum(1 for _ in self.findmissingrevs([pmax], [pmin])) e = revlogutils.entry( flags=flags, data_offset=offset, data_compressed_length=deltainfo.deltalen, data_uncompressed_length=textlen, data_compression_mode=compression_mode, data_delta_base=deltainfo.base, link_rev=link, parent_rev_1=p1r, parent_rev_2=p2r, node_id=node, sidedata_offset=sidedata_offset, sidedata_compressed_length=len(serialized_sidedata), sidedata_compression_mode=sidedata_compression_mode, rank=rank, ) self.index.append(e) entry = self.index.entry_binary(curr) if curr == 0 and self._docket is None: header = self._format_flags | self._format_version header = self.index.pack_header(header) entry = header + entry self._writeentry( transaction, entry, deltainfo.data, link, offset, serialized_sidedata, sidedata_offset, ) rawtext = btext[0] if alwayscache and rawtext is None: rawtext = deltacomputer.buildtext(revinfo) if type(rawtext) == bytes: # only accept immutable objects self._revisioncache = (node, curr, rawtext) self._chainbasecache[curr] = deltainfo.chainbase return curr def _get_data_offset(self, prev): """Returns the current offset in the (in-transaction) data file. Versions < 2 of the revlog can get this 0(1), revlog v2 needs a docket file to store that information: since sidedata can be rewritten to the end of the data file within a transaction, you can have cases where, for example, rev `n` does not have sidedata while rev `n - 1` does, leading to `n - 1`'s sidedata being written after `n`'s data. TODO cache this in a docket file before getting out of experimental.""" if self._docket is None: return self.end(prev) else: return self._docket.data_end def _writeentry( self, transaction, entry, data, link, offset, sidedata, sidedata_offset ): # Files opened in a+ mode have inconsistent behavior on various # platforms. Windows requires that a file positioning call be made # when the file handle transitions between reads and writes. See # 3686fa2b8eee and the mixedfilemodewrapper in windows.py. On other # platforms, Python or the platform itself can be buggy. Some versions # of Solaris have been observed to not append at the end of the file # if the file was seeked to before the end. See issue4943 for more. # # We work around this issue by inserting a seek() before writing. # Note: This is likely not necessary on Python 3. However, because # the file handle is reused for reads and may be seeked there, we need # to be careful before changing this. if self._writinghandles is None: msg = b'adding revision outside `revlog._writing` context' raise error.ProgrammingError(msg) ifh, dfh, sdfh = self._writinghandles if self._docket is None: ifh.seek(0, os.SEEK_END) else: ifh.seek(self._docket.index_end, os.SEEK_SET) if dfh: if self._docket is None: dfh.seek(0, os.SEEK_END) else: dfh.seek(self._docket.data_end, os.SEEK_SET) if sdfh: sdfh.seek(self._docket.sidedata_end, os.SEEK_SET) curr = len(self) - 1 if not self._inline: transaction.add(self._datafile, offset) if self._sidedatafile: transaction.add(self._sidedatafile, sidedata_offset) transaction.add(self._indexfile, curr * len(entry)) if data[0]: dfh.write(data[0]) dfh.write(data[1]) if sidedata: sdfh.write(sidedata) ifh.write(entry) else: offset += curr * self.index.entry_size transaction.add(self._indexfile, offset) ifh.write(entry) ifh.write(data[0]) ifh.write(data[1]) assert not sidedata self._enforceinlinesize(transaction) if self._docket is not None: # revlog-v2 always has 3 writing handles, help Pytype wh1 = self._writinghandles[0] wh2 = self._writinghandles[1] wh3 = self._writinghandles[2] assert wh1 is not None assert wh2 is not None assert wh3 is not None self._docket.index_end = wh1.tell() self._docket.data_end = wh2.tell() self._docket.sidedata_end = wh3.tell() nodemaputil.setup_persistent_nodemap(transaction, self) def addgroup( self, deltas, linkmapper, transaction, alwayscache=False, addrevisioncb=None, duplicaterevisioncb=None, debug_info=None, delta_base_reuse_policy=None, ): """ add a delta group given a set of deltas, add them to the revision log. the first delta is against its parent, which should be in our log, the rest are against the previous delta. If ``addrevisioncb`` is defined, it will be called with arguments of this revlog and the node that was added. """ if self._adding_group: raise error.ProgrammingError(b'cannot nest addgroup() calls') # read the default delta-base reuse policy from revlog config if the # group did not specify one. if delta_base_reuse_policy is None: if self._generaldelta and self._lazydeltabase: delta_base_reuse_policy = DELTA_BASE_REUSE_TRY else: delta_base_reuse_policy = DELTA_BASE_REUSE_NO self._adding_group = True empty = True try: with self._writing(transaction): write_debug = None if self._debug_delta: write_debug = transaction._report deltacomputer = deltautil.deltacomputer( self, write_debug=write_debug, debug_info=debug_info, ) # loop through our set of deltas for data in deltas: ( node, p1, p2, linknode, deltabase, delta, flags, sidedata, ) = data link = linkmapper(linknode) flags = flags or REVIDX_DEFAULT_FLAGS rev = self.index.get_rev(node) if rev is not None: # this can happen if two branches make the same change self._nodeduplicatecallback(transaction, rev) if duplicaterevisioncb: duplicaterevisioncb(self, rev) empty = False continue for p in (p1, p2): if not self.index.has_node(p): raise error.LookupError( p, self.radix, _(b'unknown parent') ) if not self.index.has_node(deltabase): raise error.LookupError( deltabase, self.display_id, _(b'unknown delta base') ) baserev = self.rev(deltabase) if baserev != nullrev and self.iscensored(baserev): # if base is censored, delta must be full replacement in a # single patch operation hlen = struct.calcsize(b">lll") oldlen = self.rawsize(baserev) newlen = len(delta) - hlen if delta[:hlen] != mdiff.replacediffheader( oldlen, newlen ): raise error.CensoredBaseError( self.display_id, self.node(baserev) ) if not flags and self._peek_iscensored(baserev, delta): flags |= REVIDX_ISCENSORED # We assume consumers of addrevisioncb will want to retrieve # the added revision, which will require a call to # revision(). revision() will fast path if there is a cache # hit. So, we tell _addrevision() to always cache in this case. # We're only using addgroup() in the context of changegroup # generation so the revision data can always be handled as raw # by the flagprocessor. rev = self._addrevision( node, None, transaction, link, p1, p2, flags, (baserev, delta, delta_base_reuse_policy), alwayscache=alwayscache, deltacomputer=deltacomputer, sidedata=sidedata, ) if addrevisioncb: addrevisioncb(self, rev) empty = False finally: self._adding_group = False return not empty def iscensored(self, rev): """Check if a file revision is censored.""" if not self._censorable: return False return self.flags(rev) & REVIDX_ISCENSORED def _peek_iscensored(self, baserev, delta): """Quickly check if a delta produces a censored revision.""" if not self._censorable: return False return storageutil.deltaiscensored(delta, baserev, self.rawsize) def getstrippoint(self, minlink): """find the minimum rev that must be stripped to strip the linkrev Returns a tuple containing the minimum rev and a set of all revs that have linkrevs that will be broken by this strip. """ return storageutil.resolvestripinfo( minlink, len(self) - 1, self.headrevs(), self.linkrev, self.parentrevs, ) def strip(self, minlink, transaction): """truncate the revlog on the first revision with a linkrev >= minlink This function is called when we're stripping revision minlink and its descendants from the repository. We have to remove all revisions with linkrev >= minlink, because the equivalent changelog revisions will be renumbered after the strip. So we truncate the revlog on the first of these revisions, and trust that the caller has saved the revisions that shouldn't be removed and that it'll re-add them after this truncation. """ if len(self) == 0: return rev, _ = self.getstrippoint(minlink) if rev == len(self): return # first truncate the files on disk data_end = self.start(rev) if not self._inline: transaction.add(self._datafile, data_end) end = rev * self.index.entry_size else: end = data_end + (rev * self.index.entry_size) if self._sidedatafile: sidedata_end = self.sidedata_cut_off(rev) transaction.add(self._sidedatafile, sidedata_end) transaction.add(self._indexfile, end) if self._docket is not None: # XXX we could, leverage the docket while stripping. However it is # not powerfull enough at the time of this comment self._docket.index_end = end self._docket.data_end = data_end self._docket.sidedata_end = sidedata_end self._docket.write(transaction, stripping=True) # then reset internal state in memory to forget those revisions self._revisioncache = None self._chaininfocache = util.lrucachedict(500) self._segmentfile.clear_cache() self._segmentfile_sidedata.clear_cache() del self.index[rev:-1] def checksize(self): """Check size of index and data files return a (dd, di) tuple. - dd: extra bytes for the "data" file - di: extra bytes for the "index" file A healthy revlog will return (0, 0). """ expected = 0 if len(self): expected = max(0, self.end(len(self) - 1)) try: with self._datafp() as f: f.seek(0, io.SEEK_END) actual = f.tell() dd = actual - expected except FileNotFoundError: dd = 0 try: f = self.opener(self._indexfile) f.seek(0, io.SEEK_END) actual = f.tell() f.close() s = self.index.entry_size i = max(0, actual // s) di = actual - (i * s) if self._inline: databytes = 0 for r in self: databytes += max(0, self.length(r)) dd = 0 di = actual - len(self) * s - databytes except FileNotFoundError: di = 0 return (dd, di) def files(self): res = [self._indexfile] if self._docket_file is None: if not self._inline: res.append(self._datafile) else: res.append(self._docket_file) res.extend(self._docket.old_index_filepaths(include_empty=False)) if self._docket.data_end: res.append(self._datafile) res.extend(self._docket.old_data_filepaths(include_empty=False)) if self._docket.sidedata_end: res.append(self._sidedatafile) res.extend(self._docket.old_sidedata_filepaths(include_empty=False)) return res def emitrevisions( self, nodes, nodesorder=None, revisiondata=False, assumehaveparentrevisions=False, deltamode=repository.CG_DELTAMODE_STD, sidedata_helpers=None, debug_info=None, ): if nodesorder not in (b'nodes', b'storage', b'linear', None): raise error.ProgrammingError( b'unhandled value for nodesorder: %s' % nodesorder ) if nodesorder is None and not self._generaldelta: nodesorder = b'storage' if ( not self._storedeltachains and deltamode != repository.CG_DELTAMODE_PREV ): deltamode = repository.CG_DELTAMODE_FULL return storageutil.emitrevisions( self, nodes, nodesorder, revlogrevisiondelta, deltaparentfn=self.deltaparent, candeltafn=self._candelta, rawsizefn=self.rawsize, revdifffn=self.revdiff, flagsfn=self.flags, deltamode=deltamode, revisiondata=revisiondata, assumehaveparentrevisions=assumehaveparentrevisions, sidedata_helpers=sidedata_helpers, debug_info=debug_info, ) DELTAREUSEALWAYS = b'always' DELTAREUSESAMEREVS = b'samerevs' DELTAREUSENEVER = b'never' DELTAREUSEFULLADD = b'fulladd' DELTAREUSEALL = {b'always', b'samerevs', b'never', b'fulladd'} def clone( self, tr, destrevlog, addrevisioncb=None, deltareuse=DELTAREUSESAMEREVS, forcedeltabothparents=None, sidedata_helpers=None, ): """Copy this revlog to another, possibly with format changes. The destination revlog will contain the same revisions and nodes. However, it may not be bit-for-bit identical due to e.g. delta encoding differences. The ``deltareuse`` argument control how deltas from the existing revlog are preserved in the destination revlog. The argument can have the following values: DELTAREUSEALWAYS Deltas will always be reused (if possible), even if the destination revlog would not select the same revisions for the delta. This is the fastest mode of operation. DELTAREUSESAMEREVS Deltas will be reused if the destination revlog would pick the same revisions for the delta. This mode strikes a balance between speed and optimization. DELTAREUSENEVER Deltas will never be reused. This is the slowest mode of execution. This mode can be used to recompute deltas (e.g. if the diff/delta algorithm changes). DELTAREUSEFULLADD Revision will be re-added as if their were new content. This is slower than DELTAREUSEALWAYS but allow more mechanism to kicks in. eg: large file detection and handling. Delta computation can be slow, so the choice of delta reuse policy can significantly affect run time. The default policy (``DELTAREUSESAMEREVS``) strikes a balance between two extremes. Deltas will be reused if they are appropriate. But if the delta could choose a better revision, it will do so. This means if you are converting a non-generaldelta revlog to a generaldelta revlog, deltas will be recomputed if the delta's parent isn't a parent of the revision. In addition to the delta policy, the ``forcedeltabothparents`` argument controls whether to force compute deltas against both parents for merges. By default, the current default is used. See `revlogutil.sidedata.get_sidedata_helpers` for the doc on `sidedata_helpers`. """ if deltareuse not in self.DELTAREUSEALL: raise ValueError( _(b'value for deltareuse invalid: %s') % deltareuse ) if len(destrevlog): raise ValueError(_(b'destination revlog is not empty')) if getattr(self, 'filteredrevs', None): raise ValueError(_(b'source revlog has filtered revisions')) if getattr(destrevlog, 'filteredrevs', None): raise ValueError(_(b'destination revlog has filtered revisions')) # lazydelta and lazydeltabase controls whether to reuse a cached delta, # if possible. oldlazydelta = destrevlog._lazydelta oldlazydeltabase = destrevlog._lazydeltabase oldamd = destrevlog._deltabothparents try: if deltareuse == self.DELTAREUSEALWAYS: destrevlog._lazydeltabase = True destrevlog._lazydelta = True elif deltareuse == self.DELTAREUSESAMEREVS: destrevlog._lazydeltabase = False destrevlog._lazydelta = True elif deltareuse == self.DELTAREUSENEVER: destrevlog._lazydeltabase = False destrevlog._lazydelta = False destrevlog._deltabothparents = forcedeltabothparents or oldamd with self.reading(): self._clone( tr, destrevlog, addrevisioncb, deltareuse, forcedeltabothparents, sidedata_helpers, ) finally: destrevlog._lazydelta = oldlazydelta destrevlog._lazydeltabase = oldlazydeltabase destrevlog._deltabothparents = oldamd def _clone( self, tr, destrevlog, addrevisioncb, deltareuse, forcedeltabothparents, sidedata_helpers, ): """perform the core duty of `revlog.clone` after parameter processing""" write_debug = None if self._debug_delta: write_debug = tr._report deltacomputer = deltautil.deltacomputer( destrevlog, write_debug=write_debug, ) index = self.index for rev in self: entry = index[rev] # Some classes override linkrev to take filtered revs into # account. Use raw entry from index. flags = entry[0] & 0xFFFF linkrev = entry[4] p1 = index[entry[5]][7] p2 = index[entry[6]][7] node = entry[7] # (Possibly) reuse the delta from the revlog if allowed and # the revlog chunk is a delta. cachedelta = None rawtext = None if deltareuse == self.DELTAREUSEFULLADD: text = self._revisiondata(rev) sidedata = self.sidedata(rev) if sidedata_helpers is not None: (sidedata, new_flags) = sidedatautil.run_sidedata_helpers( self, sidedata_helpers, sidedata, rev ) flags = flags | new_flags[0] & ~new_flags[1] destrevlog.addrevision( text, tr, linkrev, p1, p2, cachedelta=cachedelta, node=node, flags=flags, deltacomputer=deltacomputer, sidedata=sidedata, ) else: if destrevlog._lazydelta: dp = self.deltaparent(rev) if dp != nullrev: cachedelta = (dp, bytes(self._chunk(rev))) sidedata = None if not cachedelta: rawtext = self._revisiondata(rev) sidedata = self.sidedata(rev) if sidedata is None: sidedata = self.sidedata(rev) if sidedata_helpers is not None: (sidedata, new_flags) = sidedatautil.run_sidedata_helpers( self, sidedata_helpers, sidedata, rev ) flags = flags | new_flags[0] & ~new_flags[1] with destrevlog._writing(tr): destrevlog._addrevision( node, rawtext, tr, linkrev, p1, p2, flags, cachedelta, deltacomputer=deltacomputer, sidedata=sidedata, ) if addrevisioncb: addrevisioncb(self, rev, node) def censorrevision(self, tr, censornode, tombstone=b''): if self._format_version == REVLOGV0: raise error.RevlogError( _(b'cannot censor with version %d revlogs') % self._format_version ) elif self._format_version == REVLOGV1: rewrite.v1_censor(self, tr, censornode, tombstone) else: rewrite.v2_censor(self, tr, censornode, tombstone) def verifyintegrity(self, state): """Verifies the integrity of the revlog. Yields ``revlogproblem`` instances describing problems that are found. """ dd, di = self.checksize() if dd: yield revlogproblem(error=_(b'data length off by %d bytes') % dd) if di: yield revlogproblem(error=_(b'index contains %d extra bytes') % di) version = self._format_version # The verifier tells us what version revlog we should be. if version != state[b'expectedversion']: yield revlogproblem( warning=_(b"warning: '%s' uses revlog format %d; expected %d") % (self.display_id, version, state[b'expectedversion']) ) state[b'skipread'] = set() state[b'safe_renamed'] = set() for rev in self: node = self.node(rev) # Verify contents. 4 cases to care about: # # common: the most common case # rename: with a rename # meta: file content starts with b'\1\n', the metadata # header defined in filelog.py, but without a rename # ext: content stored externally # # More formally, their differences are shown below: # # | common | rename | meta | ext # ------------------------------------------------------- # flags() | 0 | 0 | 0 | not 0 # renamed() | False | True | False | ? # rawtext[0:2]=='\1\n'| False | True | True | ? # # "rawtext" means the raw text stored in revlog data, which # could be retrieved by "rawdata(rev)". "text" # mentioned below is "revision(rev)". # # There are 3 different lengths stored physically: # 1. L1: rawsize, stored in revlog index # 2. L2: len(rawtext), stored in revlog data # 3. L3: len(text), stored in revlog data if flags==0, or # possibly somewhere else if flags!=0 # # L1 should be equal to L2. L3 could be different from them. # "text" may or may not affect commit hash depending on flag # processors (see flagutil.addflagprocessor). # # | common | rename | meta | ext # ------------------------------------------------- # rawsize() | L1 | L1 | L1 | L1 # size() | L1 | L2-LM | L1(*) | L1 (?) # len(rawtext) | L2 | L2 | L2 | L2 # len(text) | L2 | L2 | L2 | L3 # len(read()) | L2 | L2-LM | L2-LM | L3 (?) # # LM: length of metadata, depending on rawtext # (*): not ideal, see comment in filelog.size # (?): could be "- len(meta)" if the resolved content has # rename metadata # # Checks needed to be done: # 1. length check: L1 == L2, in all cases. # 2. hash check: depending on flag processor, we may need to # use either "text" (external), or "rawtext" (in revlog). try: skipflags = state.get(b'skipflags', 0) if skipflags: skipflags &= self.flags(rev) _verify_revision(self, skipflags, state, node) l1 = self.rawsize(rev) l2 = len(self.rawdata(node)) if l1 != l2: yield revlogproblem( error=_(b'unpacked size is %d, %d expected') % (l2, l1), node=node, ) except error.CensoredNodeError: if state[b'erroroncensored']: yield revlogproblem( error=_(b'censored file data'), node=node ) state[b'skipread'].add(node) except Exception as e: yield revlogproblem( error=_(b'unpacking %s: %s') % (short(node), stringutil.forcebytestr(e)), node=node, ) state[b'skipread'].add(node) def storageinfo( self, exclusivefiles=False, sharedfiles=False, revisionscount=False, trackedsize=False, storedsize=False, ): d = {} if exclusivefiles: d[b'exclusivefiles'] = [(self.opener, self._indexfile)] if not self._inline: d[b'exclusivefiles'].append((self.opener, self._datafile)) if sharedfiles: d[b'sharedfiles'] = [] if revisionscount: d[b'revisionscount'] = len(self) if trackedsize: d[b'trackedsize'] = sum(map(self.rawsize, iter(self))) if storedsize: d[b'storedsize'] = sum( self.opener.stat(path).st_size for path in self.files() ) return d def rewrite_sidedata(self, transaction, helpers, startrev, endrev): if not self.hassidedata: return # revlog formats with sidedata support does not support inline assert not self._inline if not helpers[1] and not helpers[2]: # Nothing to generate or remove return new_entries = [] # append the new sidedata with self._writing(transaction): ifh, dfh, sdfh = self._writinghandles dfh.seek(self._docket.sidedata_end, os.SEEK_SET) current_offset = sdfh.tell() for rev in range(startrev, endrev + 1): entry = self.index[rev] new_sidedata, flags = sidedatautil.run_sidedata_helpers( store=self, sidedata_helpers=helpers, sidedata={}, rev=rev, ) serialized_sidedata = sidedatautil.serialize_sidedata( new_sidedata ) sidedata_compression_mode = COMP_MODE_INLINE if serialized_sidedata and self.hassidedata: sidedata_compression_mode = COMP_MODE_PLAIN h, comp_sidedata = self.compress(serialized_sidedata) if ( h != b'u' and comp_sidedata[0] != b'\0' and len(comp_sidedata) < len(serialized_sidedata) ): assert not h if ( comp_sidedata[0] == self._docket.default_compression_header ): sidedata_compression_mode = COMP_MODE_DEFAULT serialized_sidedata = comp_sidedata else: sidedata_compression_mode = COMP_MODE_INLINE serialized_sidedata = comp_sidedata if entry[8] != 0 or entry[9] != 0: # rewriting entries that already have sidedata is not # supported yet, because it introduces garbage data in the # revlog. msg = b"rewriting existing sidedata is not supported yet" raise error.Abort(msg) # Apply (potential) flags to add and to remove after running # the sidedata helpers new_offset_flags = entry[0] | flags[0] & ~flags[1] entry_update = ( current_offset, len(serialized_sidedata), new_offset_flags, sidedata_compression_mode, ) # the sidedata computation might have move the file cursors around sdfh.seek(current_offset, os.SEEK_SET) sdfh.write(serialized_sidedata) new_entries.append(entry_update) current_offset += len(serialized_sidedata) self._docket.sidedata_end = sdfh.tell() # rewrite the new index entries ifh.seek(startrev * self.index.entry_size) for i, e in enumerate(new_entries): rev = startrev + i self.index.replace_sidedata_info(rev, *e) packed = self.index.entry_binary(rev) if rev == 0 and self._docket is None: header = self._format_flags | self._format_version header = self.index.pack_header(header) packed = header + packed ifh.write(packed)