# branchmap.py - logic to computes, maintain and stores branchmap for local repo # # Copyright 2005-2007 Olivia Mackall # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import annotations from .node import ( bin, hex, nullrev, ) from typing import ( Any, Callable, Dict, Iterable, List, Optional, Set, TYPE_CHECKING, Tuple, Union, cast, ) from . import ( encoding, error, obsolete, scmutil, util, ) from .utils import ( repoviewutil, stringutil, ) if TYPE_CHECKING: from . import localrepo assert [localrepo] subsettable = repoviewutil.subsettable class BranchMapCache: """mapping of filtered views of repo with their branchcache""" def __init__(self): self._per_filter = {} def __getitem__(self, repo): self.updatecache(repo) bcache = self._per_filter[repo.filtername] bcache._ensure_populated(repo) assert bcache._filtername == repo.filtername, ( bcache._filtername, repo.filtername, ) return bcache def update_disk(self, repo, detect_pure_topo=False): """ensure and up-to-date cache is (or will be) written on disk The cache for this repository view is updated if needed and written on disk. If a transaction is in progress, the writing is schedule to transaction close. See the `BranchMapCache.write_dirty` method. This method exist independently of __getitem__ as it is sometime useful to signal that we have no intend to use the data in memory yet. """ self.updatecache(repo) bcache = self._per_filter[repo.filtername] assert bcache._filtername == repo.filtername, ( bcache._filtername, repo.filtername, ) if detect_pure_topo: bcache._detect_pure_topo(repo) tr = repo.currenttransaction() if getattr(tr, 'finalized', True): bcache.sync_disk(repo) def updatecache(self, repo): """Update the cache for the given filtered view on a repository""" # This can trigger updates for the caches for subsets of the filtered # view, e.g. when there is no cache for this filtered view or the cache # is stale. cl = repo.changelog filtername = repo.filtername bcache = self._per_filter.get(filtername) if bcache is None or not bcache.validfor(repo): # cache object missing or cache object stale? Read from disk bcache = branch_cache_from_file(repo) revs = [] if bcache is None: # no (fresh) cache available anymore, perhaps we can re-use # the cache for a subset, then extend that to add info on missing # revisions. subsetname = subsettable.get(filtername) if subsetname is not None: subset = repo.filtered(subsetname) self.updatecache(subset) bcache = self._per_filter[subset.filtername].inherit_for(repo) extrarevs = subset.changelog.filteredrevs - cl.filteredrevs revs.extend(r for r in extrarevs if r <= bcache.tiprev) else: # nothing to fall back on, start empty. bcache = new_branch_cache(repo) revs.extend(cl.revs(start=bcache.tiprev + 1)) if revs: bcache.update(repo, revs) assert bcache.validfor(repo), filtername self._per_filter[repo.filtername] = bcache def replace(self, repo, remotebranchmap): """Replace the branchmap cache for a repo with a branch mapping. This is likely only called during clone with a branch map from a remote. """ cl = repo.changelog clrev = cl.rev clbranchinfo = cl.branchinfo rbheads = [] closed = set() for bheads in remotebranchmap.values(): rbheads += bheads for h in bheads: r = clrev(h) b, c = clbranchinfo(r) if c: closed.add(h) if rbheads: rtiprev = max((int(clrev(node)) for node in rbheads)) cache = new_branch_cache( repo, remotebranchmap, repo[rtiprev].node(), rtiprev, closednodes=closed, ) # Try to stick it as low as possible # filter above served are unlikely to be fetch from a clone for candidate in (b'base', b'immutable', b'served'): rview = repo.filtered(candidate) if cache.validfor(rview): cache._filtername = candidate self._per_filter[candidate] = cache cache._state = STATE_DIRTY cache.write(rview) return def clear(self): self._per_filter.clear() def write_dirty(self, repo): unfi = repo.unfiltered() for filtername in repoviewutil.get_ordered_subset(): cache = self._per_filter.get(filtername) if cache is None: continue if filtername is None: repo = unfi else: repo = unfi.filtered(filtername) cache.sync_disk(repo) def _unknownnode(node): """raises ValueError when branchcache found a node which does not exists""" raise ValueError('node %s does not exist' % node.hex()) def _branchcachedesc(repo): if repo.filtername is not None: return b'branch cache (%s)' % repo.filtername else: return b'branch cache' class _BaseBranchCache: """A dict like object that hold branches heads cache. This cache is used to avoid costly computations to determine all the branch heads of a repo. """ def __init__( self, repo: "localrepo.localrepository", entries: Union[ Dict[bytes, List[bytes]], Iterable[Tuple[bytes, List[bytes]]] ] = (), closed_nodes: Optional[Set[bytes]] = None, ) -> None: """hasnode is a function which can be used to verify whether changelog has a given node or not. If it's not provided, we assume that every node we have exists in changelog""" # closednodes is a set of nodes that close their branch. If the branch # cache has been updated, it may contain nodes that are no longer # heads. if closed_nodes is None: closed_nodes = set() self._closednodes = set(closed_nodes) self._entries = dict(entries) def __iter__(self): return iter(self._entries) def __setitem__(self, key, value): self._entries[key] = value def __getitem__(self, key): return self._entries[key] def __contains__(self, key): return key in self._entries def iteritems(self): return self._entries.items() items = iteritems def hasbranch(self, label): """checks whether a branch of this name exists or not""" return label in self._entries def _branchtip(self, heads): """Return tuple with last open head in heads and false, otherwise return last closed head and true.""" tip = heads[-1] closed = True for h in reversed(heads): if h not in self._closednodes: tip = h closed = False break return tip, closed def branchtip(self, branch): """Return the tipmost open head on branch head, otherwise return the tipmost closed head on branch. Raise KeyError for unknown branch.""" return self._branchtip(self[branch])[0] def iteropen(self, nodes): return (n for n in nodes if n not in self._closednodes) def branchheads(self, branch, closed=False): heads = self._entries[branch] if not closed: heads = list(self.iteropen(heads)) return heads def iterbranches(self): for bn, heads in self.items(): yield (bn, heads) + self._branchtip(heads) def iterheads(self): """returns all the heads""" return self._entries.values() def update(self, repo, revgen): """Given a branchhead cache, self, that may have extra nodes or be missing heads, and a generator of nodes that are strictly a superset of heads missing, this function updates self to be correct. """ starttime = util.timer() cl = repo.changelog # Faster than using ctx.obsolete() obsrevs = obsolete.getrevs(repo, b'obsolete') # collect new branch entries newbranches = {} new_closed = set() obs_ignored = set() getbranchinfo = repo.revbranchcache().branchinfo max_rev = -1 for r in revgen: max_rev = max(max_rev, r) if r in obsrevs: # We ignore obsolete changesets as they shouldn't be # considered heads. obs_ignored.add(r) continue branch, closesbranch = getbranchinfo(r) newbranches.setdefault(branch, []).append(r) if closesbranch: new_closed.add(r) if max_rev < 0: msg = "running branchcache.update without revision to update" raise error.ProgrammingError(msg) self._process_new( repo, newbranches, new_closed, obs_ignored, max_rev, ) self._closednodes.update(cl.node(rev) for rev in new_closed) duration = util.timer() - starttime repo.ui.log( b'branchcache', b'updated %s in %.4f seconds\n', _branchcachedesc(repo), duration, ) return max_rev def _process_new( self, repo, newbranches, new_closed, obs_ignored, max_rev, ): """update the branchmap from a set of new information""" # Delay fetching the topological heads until they are needed. # A repository without non-continous branches can skip this part. topoheads = None cl = repo.changelog getbranchinfo = repo.revbranchcache().branchinfo # Faster than using ctx.obsolete() obsrevs = obsolete.getrevs(repo, b'obsolete') # If a changeset is visible, its parents must be visible too, so # use the faster unfiltered parent accessor. parentrevs = cl._uncheckedparentrevs for branch, newheadrevs in newbranches.items(): # For every branch, compute the new branchheads. # A branchhead is a revision such that no descendant is on # the same branch. # # The branchheads are computed iteratively in revision order. # This ensures topological order, i.e. parents are processed # before their children. Ancestors are inclusive here, i.e. # any revision is an ancestor of itself. # # Core observations: # - The current revision is always a branchhead for the # repository up to that point. # - It is the first revision of the branch if and only if # there was no branchhead before. In that case, it is the # only branchhead as there are no possible ancestors on # the same branch. # - If a parent is on the same branch, a branchhead can # only be an ancestor of that parent, if it is parent # itself. Otherwise it would have been removed as ancestor # of that parent before. # - Therefore, if all parents are on the same branch, they # can just be removed from the branchhead set. # - If one parent is on the same branch and the other is not # and there was exactly one branchhead known, the existing # branchhead can only be an ancestor if it is the parent. # Otherwise it would have been removed as ancestor of # the parent before. The other parent therefore can't have # a branchhead as ancestor. # - In all other cases, the parents on different branches # could have a branchhead as ancestor. Those parents are # kept in the "uncertain" set. If all branchheads are also # topological heads, they can't have descendants and further # checks can be skipped. Otherwise, the ancestors of the # "uncertain" set are removed from branchheads. # This computation is heavy and avoided if at all possible. bheads = self._entries.get(branch, []) bheadset = {cl.rev(node) for node in bheads} uncertain = set() for newrev in sorted(newheadrevs): if not bheadset: bheadset.add(newrev) continue parents = [p for p in parentrevs(newrev) if p != nullrev] samebranch = set() otherbranch = set() obsparents = set() for p in parents: if p in obsrevs: # We ignored this obsolete changeset earlier, but now # that it has non-ignored children, we need to make # sure their ancestors are not considered heads. To # achieve that, we will simply treat this obsolete # changeset as a parent from other branch. obsparents.add(p) elif p in bheadset or getbranchinfo(p)[0] == branch: samebranch.add(p) else: otherbranch.add(p) if not (len(bheadset) == len(samebranch) == 1): uncertain.update(otherbranch) uncertain.update(obsparents) bheadset.difference_update(samebranch) bheadset.add(newrev) if uncertain: if topoheads is None: topoheads = set(cl.headrevs()) if bheadset - topoheads: floorrev = min(bheadset) if floorrev <= max(uncertain): ancestors = set(cl.ancestors(uncertain, floorrev)) bheadset -= ancestors if bheadset: self[branch] = [cl.node(rev) for rev in sorted(bheadset)] STATE_CLEAN = 1 STATE_INHERITED = 2 STATE_DIRTY = 3 class _LocalBranchCache(_BaseBranchCache): """base class of branch-map info for a local repo or repoview""" _base_filename = None _default_key_hashes: Tuple[bytes] = cast(Tuple[bytes], ()) def __init__( self, repo: "localrepo.localrepository", entries: Union[ Dict[bytes, List[bytes]], Iterable[Tuple[bytes, List[bytes]]] ] = (), tipnode: Optional[bytes] = None, tiprev: Optional[int] = nullrev, key_hashes: Optional[Tuple[bytes]] = None, closednodes: Optional[Set[bytes]] = None, hasnode: Optional[Callable[[bytes], bool]] = None, verify_node: bool = False, inherited: bool = False, ) -> None: """hasnode is a function which can be used to verify whether changelog has a given node or not. If it's not provided, we assume that every node we have exists in changelog""" self._filtername = repo.filtername if tipnode is None: self.tipnode = repo.nullid else: self.tipnode = tipnode self.tiprev = tiprev if key_hashes is None: self.key_hashes = self._default_key_hashes else: self.key_hashes = key_hashes self._state = STATE_CLEAN if inherited: self._state = STATE_INHERITED super().__init__(repo=repo, entries=entries, closed_nodes=closednodes) # closednodes is a set of nodes that close their branch. If the branch # cache has been updated, it may contain nodes that are no longer # heads. # Do we need to verify branch at all ? self._verify_node = verify_node # branches for which nodes are verified self._verifiedbranches = set() self._hasnode = None if self._verify_node: self._hasnode = repo.changelog.hasnode def _compute_key_hashes(self, repo) -> Tuple[bytes]: raise NotImplementedError def _ensure_populated(self, repo): """make sure any lazily loaded values are fully populated""" def _detect_pure_topo(self, repo) -> None: pass def validfor(self, repo): """check that cache contents are valid for (a subset of) this repo - False when the order of changesets changed or if we detect a strip. - True when cache is up-to-date for the current repo or its subset.""" try: node = repo.changelog.node(self.tiprev) except IndexError: # changesets were stripped and now we don't even have enough to # find tiprev return False if self.tipnode != node: # tiprev doesn't correspond to tipnode: repo was stripped, or this # repo has a different order of changesets return False repo_key_hashes = self._compute_key_hashes(repo) # hashes don't match if this repo view has a different set of filtered # revisions (e.g. due to phase changes) or obsolete revisions (e.g. # history was rewritten) return self.key_hashes == repo_key_hashes @classmethod def fromfile(cls, repo): f = None try: f = repo.cachevfs(cls._filename(repo)) lineiter = iter(f) init_kwargs = cls._load_header(repo, lineiter) bcache = cls( repo, verify_node=True, **init_kwargs, ) if not bcache.validfor(repo): # invalidate the cache raise ValueError('tip differs') bcache._load_heads(repo, lineiter) except (IOError, OSError): return None except Exception as inst: if repo.ui.debugflag: msg = b'invalid %s: %s\n' msg %= ( _branchcachedesc(repo), stringutil.forcebytestr(inst), ) repo.ui.debug(msg) bcache = None finally: if f: f.close() return bcache @classmethod def _load_header(cls, repo, lineiter) -> "dict[str, Any]": raise NotImplementedError def _load_heads(self, repo, lineiter): """fully loads the branchcache by reading from the file using the line iterator passed""" for line in lineiter: line = line.rstrip(b'\n') if not line: continue node, state, label = line.split(b" ", 2) if state not in b'oc': raise ValueError('invalid branch state') label = encoding.tolocal(label.strip()) node = bin(node) self._entries.setdefault(label, []).append(node) if state == b'c': self._closednodes.add(node) @classmethod def _filename(cls, repo): """name of a branchcache file for a given repo or repoview""" filename = cls._base_filename assert filename is not None if repo.filtername: filename = b'%s-%s' % (filename, repo.filtername) return filename def inherit_for(self, repo): """return a deep copy of the branchcache object""" assert repo.filtername != self._filtername other = type(self)( repo=repo, # we always do a shally copy of self._entries, and the values is # always replaced, so no need to deepcopy until the above remains # true. entries=self._entries, tipnode=self.tipnode, tiprev=self.tiprev, key_hashes=self.key_hashes, closednodes=set(self._closednodes), verify_node=self._verify_node, inherited=True, ) # also copy information about the current verification state other._verifiedbranches = set(self._verifiedbranches) return other def sync_disk(self, repo): """synchronise the on disk file with the cache state If new value specific to this filter level need to be written, the file will be updated, if the state of the branchcache is inherited from a subset, any stalled on disk file will be deleted. That method does nothing if there is nothing to do. """ if self._state == STATE_DIRTY: self.write(repo) elif self._state == STATE_INHERITED: filename = self._filename(repo) repo.cachevfs.tryunlink(filename) def write(self, repo): assert self._filtername == repo.filtername, ( self._filtername, repo.filtername, ) assert self._state == STATE_DIRTY, self._state # This method should not be called during an open transaction tr = repo.currenttransaction() if not getattr(tr, 'finalized', True): msg = "writing branchcache in the middle of a transaction" raise error.ProgrammingError(msg) try: filename = self._filename(repo) with repo.cachevfs(filename, b"w", atomictemp=True) as f: self._write_header(f) nodecount = self._write_heads(repo, f) repo.ui.log( b'branchcache', b'wrote %s with %d labels and %d nodes\n', _branchcachedesc(repo), len(self._entries), nodecount, ) self._state = STATE_CLEAN except (IOError, OSError, error.Abort) as inst: # Abort may be raised by read only opener, so log and continue repo.ui.debug( b"couldn't write branch cache: %s\n" % stringutil.forcebytestr(inst) ) def _write_header(self, fp) -> None: raise NotImplementedError def _write_heads(self, repo, fp) -> int: """write list of heads to a file Return the number of heads written.""" nodecount = 0 for label, nodes in sorted(self._entries.items()): label = encoding.fromlocal(label) for node in nodes: nodecount += 1 if node in self._closednodes: state = b'c' else: state = b'o' fp.write(b"%s %s %s\n" % (hex(node), state, label)) return nodecount def _verifybranch(self, branch): """verify head nodes for the given branch.""" if not self._verify_node: return if branch not in self._entries or branch in self._verifiedbranches: return assert self._hasnode is not None for n in self._entries[branch]: if not self._hasnode(n): _unknownnode(n) self._verifiedbranches.add(branch) def _verifyall(self): """verifies nodes of all the branches""" for b in self._entries.keys(): if b not in self._verifiedbranches: self._verifybranch(b) def __getitem__(self, key): self._verifybranch(key) return super().__getitem__(key) def __contains__(self, key): self._verifybranch(key) return super().__contains__(key) def iteritems(self): self._verifyall() return super().iteritems() items = iteritems def iterheads(self): """returns all the heads""" self._verifyall() return super().iterheads() def hasbranch(self, label): """checks whether a branch of this name exists or not""" self._verifybranch(label) return super().hasbranch(label) def branchheads(self, branch, closed=False): self._verifybranch(branch) return super().branchheads(branch, closed=closed) def update(self, repo, revgen): assert self._filtername == repo.filtername, ( self._filtername, repo.filtername, ) cl = repo.changelog max_rev = super().update(repo, revgen) # new tip revision which we found after iterating items from new # branches if max_rev is not None and max_rev > self.tiprev: self.tiprev = max_rev self.tipnode = cl.node(max_rev) else: # We should not be here is if this is false assert cl.node(self.tiprev) == self.tipnode if not self.validfor(repo): # the tiprev and tipnode should be aligned, so if the current repo # is not seens as valid this is because old cache key is now # invalid for the repo. # # However. we've just updated the cache and we assume it's valid, # so let's make the cache key valid as well by recomputing it from # the cached data self.key_hashes = self._compute_key_hashes(repo) self.filteredhash = scmutil.combined_filtered_and_obsolete_hash( repo, self.tiprev, ) self._state = STATE_DIRTY tr = repo.currenttransaction() if getattr(tr, 'finalized', True): # Avoid premature writing. # # (The cache warming setup by localrepo will update the file later.) self.write(repo) def branch_cache_from_file(repo) -> Optional[_LocalBranchCache]: """Build a branch cache from on-disk data if possible Return a branch cache of the right format depending of the repository. """ if repo.ui.configbool(b"experimental", b"branch-cache-v3"): return BranchCacheV3.fromfile(repo) else: return BranchCacheV2.fromfile(repo) def new_branch_cache(repo, *args, **kwargs): """Build a new branch cache from argument Return a branch cache of the right format depending of the repository. """ if repo.ui.configbool(b"experimental", b"branch-cache-v3"): return BranchCacheV3(repo, *args, **kwargs) else: return BranchCacheV2(repo, *args, **kwargs) class BranchCacheV2(_LocalBranchCache): """a branch cache using version 2 of the format on disk The cache is serialized on disk in the following format: [optional filtered repo hex hash] ... The first line is used to check if the cache is still valid. If the branch cache is for a filtered repo view, an optional third hash is included that hashes the hashes of all filtered and obsolete revisions. The open/closed state is represented by a single letter 'o' or 'c'. This field can be used to avoid changelog reads when determining if a branch head closes a branch or not. """ _base_filename = b"branch2" @classmethod def _load_header(cls, repo, lineiter) -> "dict[str, Any]": """parse the head of a branchmap file return parameters to pass to a newly created class instance. """ cachekey = next(lineiter).rstrip(b'\n').split(b" ", 2) last, lrev = cachekey[:2] last, lrev = bin(last), int(lrev) filteredhash = () if len(cachekey) > 2: filteredhash = (bin(cachekey[2]),) return { "tipnode": last, "tiprev": lrev, "key_hashes": filteredhash, } def _write_header(self, fp) -> None: """write the branch cache header to a file""" cachekey = [hex(self.tipnode), b'%d' % self.tiprev] if self.key_hashes: cachekey.append(hex(self.key_hashes[0])) fp.write(b" ".join(cachekey) + b'\n') def _compute_key_hashes(self, repo) -> Tuple[bytes]: """return the cache key hashes that match this repoview state""" filtered_hash = scmutil.combined_filtered_and_obsolete_hash( repo, self.tiprev, needobsolete=True, ) keys: Tuple[bytes] = cast(Tuple[bytes], ()) if filtered_hash is not None: keys: Tuple[bytes] = (filtered_hash,) return keys class BranchCacheV3(_LocalBranchCache): """a branch cache using version 3 of the format on disk This version is still EXPERIMENTAL and the format is subject to changes. The cache is serialized on disk in the following format: = = […] ... The first line is used to check if the cache is still valid. It is a series of key value pair. The following key are recognized: - tip-rev: the rev-num of the tip-most revision seen by this cache - tip-node: the node-id of the tip-most revision sen by this cache - filtered-hash: the hash of all filtered revisions (before tip-rev) ignored by this cache. - obsolete-hash: the hash of all non-filtered obsolete revisions (before tip-rev) ignored by this cache. The tip-rev is used to know how far behind the value in the file are compared to the current repository state. The tip-node, filtered-hash and obsolete-hash are used to detect if this cache can be used for this repository state at all. The open/closed state is represented by a single letter 'o' or 'c'. This field can be used to avoid changelog reads when determining if a branch head closes a branch or not. Topological heads are not included in the listing and should be dispatched on the right branch at read time. Obsolete topological heads should be ignored. """ _base_filename = b"branch3-exp" _default_key_hashes = (None, None) def __init__(self, *args, pure_topo_branch=None, **kwargs): super().__init__(*args, **kwargs) self._pure_topo_branch = pure_topo_branch self._needs_populate = self._pure_topo_branch is not None def inherit_for(self, repo): new = super().inherit_for(repo) new._pure_topo_branch = self._pure_topo_branch new._needs_populate = self._needs_populate return new def _get_topo_heads(self, repo): """returns the topological head of a repoview content up to self.tiprev""" cl = repo.changelog if self.tiprev == nullrev: return [] elif self.tiprev == cl.tiprev(): return cl.headrevs() else: heads = cl.headrevs(stop_rev=self.tiprev + 1) return heads def _write_header(self, fp) -> None: cache_keys = { b"tip-node": hex(self.tipnode), b"tip-rev": b'%d' % self.tiprev, } if self.key_hashes: if self.key_hashes[0] is not None: cache_keys[b"filtered-hash"] = hex(self.key_hashes[0]) if self.key_hashes[1] is not None: cache_keys[b"obsolete-hash"] = hex(self.key_hashes[1]) if self._pure_topo_branch is not None: cache_keys[b"topo-mode"] = b"pure" pieces = (b"%s=%s" % i for i in sorted(cache_keys.items())) fp.write(b" ".join(pieces) + b'\n') if self._pure_topo_branch is not None: label = encoding.fromlocal(self._pure_topo_branch) fp.write(label + b'\n') def _write_heads(self, repo, fp) -> int: """write list of heads to a file Return the number of heads written.""" to_node = repo.changelog.node nodecount = 0 topo_heads = None if self._pure_topo_branch is None: # we match using node because it is faster to built the set of node # than to resolve node → rev later. topo_heads = set(to_node(r) for r in self._get_topo_heads(repo)) for label, nodes in sorted(self._entries.items()): if label == self._pure_topo_branch: # not need to write anything the header took care of that continue label = encoding.fromlocal(label) for node in nodes: if topo_heads is not None: if node in topo_heads: continue if node in self._closednodes: state = b'c' else: state = b'o' nodecount += 1 fp.write(b"%s %s %s\n" % (hex(node), state, label)) return nodecount @classmethod def _load_header(cls, repo, lineiter): header_line = next(lineiter) pieces = header_line.rstrip(b'\n').split(b" ") for p in pieces: if b'=' not in p: msg = b"invalid header_line: %r" % header_line raise ValueError(msg) cache_keys = dict(p.split(b'=', 1) for p in pieces) args = {} filtered_hash = None obsolete_hash = None has_pure_topo_heads = False for k, v in cache_keys.items(): if k == b"tip-rev": args["tiprev"] = int(v) elif k == b"tip-node": args["tipnode"] = bin(v) elif k == b"filtered-hash": filtered_hash = bin(v) elif k == b"obsolete-hash": obsolete_hash = bin(v) elif k == b"topo-mode": if v == b"pure": has_pure_topo_heads = True else: msg = b"unknown topo-mode: %r" % v raise ValueError(msg) else: msg = b"unknown cache key: %r" % k raise ValueError(msg) args["key_hashes"] = (filtered_hash, obsolete_hash) if has_pure_topo_heads: pure_line = next(lineiter).rstrip(b'\n') args["pure_topo_branch"] = encoding.tolocal(pure_line) return args def _load_heads(self, repo, lineiter): """fully loads the branchcache by reading from the file using the line iterator passed""" super()._load_heads(repo, lineiter) if self._pure_topo_branch is not None: # no need to read the repository heads, we know their value already. return cl = repo.changelog getbranchinfo = repo.revbranchcache().branchinfo obsrevs = obsolete.getrevs(repo, b'obsolete') to_node = cl.node touched_branch = set() for head in self._get_topo_heads(repo): if head in obsrevs: continue node = to_node(head) branch, closed = getbranchinfo(head) self._entries.setdefault(branch, []).append(node) if closed: self._closednodes.add(node) touched_branch.add(branch) to_rev = cl.index.rev for branch in touched_branch: self._entries[branch].sort(key=to_rev) def _compute_key_hashes(self, repo) -> Tuple[bytes]: """return the cache key hashes that match this repoview state""" return scmutil.filtered_and_obsolete_hash( repo, self.tiprev, ) def _process_new( self, repo, newbranches, new_closed, obs_ignored, max_rev, ) -> None: if ( # note: the check about `obs_ignored` is too strict as the # obsolete revision could be non-topological, but lets keep # things simple for now # # The same apply to `new_closed` if the closed changeset are # not a head, we don't care that it is closed, but lets keep # things simple here too. not (obs_ignored or new_closed) and ( not newbranches or ( len(newbranches) == 1 and ( self.tiprev == nullrev or self._pure_topo_branch in newbranches ) ) ) ): if newbranches: assert len(newbranches) == 1 self._pure_topo_branch = list(newbranches.keys())[0] self._needs_populate = True self._entries.pop(self._pure_topo_branch, None) return self._ensure_populated(repo) self._pure_topo_branch = None super()._process_new( repo, newbranches, new_closed, obs_ignored, max_rev, ) def _ensure_populated(self, repo): """make sure any lazily loaded values are fully populated""" if self._needs_populate: assert self._pure_topo_branch is not None cl = repo.changelog to_node = cl.node topo_heads = self._get_topo_heads(repo) heads = [to_node(r) for r in topo_heads] self._entries[self._pure_topo_branch] = heads self._needs_populate = False def _detect_pure_topo(self, repo) -> None: if self._pure_topo_branch is not None: # we are pure topological already return to_node = repo.changelog.node topo_heads = [to_node(r) for r in self._get_topo_heads(repo)] if any(n in self._closednodes for n in topo_heads): return for branch, heads in self._entries.items(): if heads == topo_heads: self._pure_topo_branch = branch self._state = STATE_DIRTY break class remotebranchcache(_BaseBranchCache): """Branchmap info for a remote connection, should not write locally""" def __init__( self, repo: "localrepo.localrepository", entries: Union[ Dict[bytes, List[bytes]], Iterable[Tuple[bytes, List[bytes]]] ] = (), closednodes: Optional[Set[bytes]] = None, ) -> None: super().__init__(repo=repo, entries=entries, closed_nodes=closednodes)