# ex:ts=4:sw=4:sts=4:et # -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- # # BitBake Cache implementation # # Caching of bitbake variables before task execution # Copyright (C) 2006 Richard Purdie # Copyright (C) 2012 Intel Corporation # but small sections based on code from bin/bitbake: # Copyright (C) 2003, 2004 Chris Larson # Copyright (C) 2003, 2004 Phil Blundell # Copyright (C) 2003 - 2005 Michael 'Mickey' Lauer # Copyright (C) 2005 Holger Hans Peter Freyther # Copyright (C) 2005 ROAD GmbH # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License version 2 as # published by the Free Software Foundation. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License along # with this program; if not, write to the Free Software Foundation, Inc., # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. import os import logging from collections import defaultdict import bb.utils logger = logging.getLogger("BitBake.Cache") try: import cPickle as pickle except ImportError: import pickle logger.info("Importing cPickle failed. " "Falling back to a very slow implementation.") __cache_version__ = "149" def getCacheFile(path, filename, data_hash): return os.path.join(path, filename + "." + data_hash) # RecipeInfoCommon defines common data retrieving methods # from meta data for caches. CoreRecipeInfo as well as other # Extra RecipeInfo needs to inherit this class class RecipeInfoCommon(object): @classmethod def listvar(cls, var, metadata): return cls.getvar(var, metadata).split() @classmethod def intvar(cls, var, metadata): return int(cls.getvar(var, metadata) or 0) @classmethod def depvar(cls, var, metadata): return bb.utils.explode_deps(cls.getvar(var, metadata)) @classmethod def pkgvar(cls, var, packages, metadata): return dict((pkg, cls.depvar("%s_%s" % (var, pkg), metadata)) for pkg in packages) @classmethod def taskvar(cls, var, tasks, metadata): return dict((task, cls.getvar("%s_task-%s" % (var, task), metadata)) for task in tasks) @classmethod def flaglist(cls, flag, varlist, metadata, squash=False): out_dict = dict((var, metadata.getVarFlag(var, flag, True)) for var in varlist) if squash: return dict((k,v) for (k,v) in out_dict.iteritems() if v) else: return out_dict @classmethod def getvar(cls, var, metadata, expand = True): return metadata.getVar(var, expand) or '' class CoreRecipeInfo(RecipeInfoCommon): __slots__ = () cachefile = "bb_cache.dat" def __init__(self, filename, metadata): self.file_depends = metadata.getVar('__depends', False) self.timestamp = bb.parse.cached_mtime(filename) self.variants = self.listvar('__VARIANTS', metadata) + [''] self.appends = self.listvar('__BBAPPEND', metadata) self.nocache = self.getvar('BB_DONT_CACHE', metadata) self.skipreason = self.getvar('__SKIPPED', metadata) if self.skipreason: self.pn = self.getvar('PN', metadata) or bb.parse.BBHandler.vars_from_file(filename,metadata)[0] self.skipped = True self.provides = self.depvar('PROVIDES', metadata) self.rprovides = self.depvar('RPROVIDES', metadata) return self.tasks = metadata.getVar('__BBTASKS', False) self.pn = self.getvar('PN', metadata) self.packages = self.listvar('PACKAGES', metadata) if not self.pn in self.packages: self.packages.append(self.pn) self.basetaskhashes = self.taskvar('BB_BASEHASH', self.tasks, metadata) self.hashfilename = self.getvar('BB_HASHFILENAME', metadata) self.task_deps = metadata.getVar('_task_deps', False) or {'tasks': [], 'parents': {}} self.skipped = False self.pe = self.getvar('PE', metadata) self.pv = self.getvar('PV', metadata) self.pr = self.getvar('PR', metadata) self.defaultpref = self.intvar('DEFAULT_PREFERENCE', metadata) self.not_world = self.getvar('EXCLUDE_FROM_WORLD', metadata) self.stamp = self.getvar('STAMP', metadata) self.stampclean = self.getvar('STAMPCLEAN', metadata) self.stamp_extrainfo = self.flaglist('stamp-extra-info', self.tasks, metadata) self.file_checksums = self.flaglist('file-checksums', self.tasks, metadata, True) self.packages_dynamic = self.listvar('PACKAGES_DYNAMIC', metadata) self.depends = self.depvar('DEPENDS', metadata) self.provides = self.depvar('PROVIDES', metadata) self.rdepends = self.depvar('RDEPENDS', metadata) self.rprovides = self.depvar('RPROVIDES', metadata) self.rrecommends = self.depvar('RRECOMMENDS', metadata) self.rprovides_pkg = self.pkgvar('RPROVIDES', self.packages, metadata) self.rdepends_pkg = self.pkgvar('RDEPENDS', self.packages, metadata) self.rrecommends_pkg = self.pkgvar('RRECOMMENDS', self.packages, metadata) self.inherits = self.getvar('__inherit_cache', metadata, expand=False) self.fakerootenv = self.getvar('FAKEROOTENV', metadata) self.fakerootdirs = self.getvar('FAKEROOTDIRS', metadata) self.fakerootnoenv = self.getvar('FAKEROOTNOENV', metadata) self.extradepsfunc = self.getvar('calculate_extra_depends', metadata) @classmethod def init_cacheData(cls, cachedata): # CacheData in Core RecipeInfo Class cachedata.task_deps = {} cachedata.pkg_fn = {} cachedata.pkg_pn = defaultdict(list) cachedata.pkg_pepvpr = {} cachedata.pkg_dp = {} cachedata.stamp = {} cachedata.stampclean = {} cachedata.stamp_extrainfo = {} cachedata.file_checksums = {} cachedata.fn_provides = {} cachedata.pn_provides = defaultdict(list) cachedata.all_depends = [] cachedata.deps = defaultdict(list) cachedata.packages = defaultdict(list) cachedata.providers = defaultdict(list) cachedata.rproviders = defaultdict(list) cachedata.packages_dynamic = defaultdict(list) cachedata.rundeps = defaultdict(lambda: defaultdict(list)) cachedata.runrecs = defaultdict(lambda: defaultdict(list)) cachedata.possible_world = [] cachedata.universe_target = [] cachedata.hashfn = {} cachedata.basetaskhash = {} cachedata.inherits = {} cachedata.fakerootenv = {} cachedata.fakerootnoenv = {} cachedata.fakerootdirs = {} cachedata.extradepsfunc = {} def add_cacheData(self, cachedata, fn): cachedata.task_deps[fn] = self.task_deps cachedata.pkg_fn[fn] = self.pn cachedata.pkg_pn[self.pn].append(fn) cachedata.pkg_pepvpr[fn] = (self.pe, self.pv, self.pr) cachedata.pkg_dp[fn] = self.defaultpref cachedata.stamp[fn] = self.stamp cachedata.stampclean[fn] = self.stampclean cachedata.stamp_extrainfo[fn] = self.stamp_extrainfo cachedata.file_checksums[fn] = self.file_checksums provides = [self.pn] for provide in self.provides: if provide not in provides: provides.append(provide) cachedata.fn_provides[fn] = provides for provide in provides: cachedata.providers[provide].append(fn) if provide not in cachedata.pn_provides[self.pn]: cachedata.pn_provides[self.pn].append(provide) for dep in self.depends: if dep not in cachedata.deps[fn]: cachedata.deps[fn].append(dep) if dep not in cachedata.all_depends: cachedata.all_depends.append(dep) rprovides = self.rprovides for package in self.packages: cachedata.packages[package].append(fn) rprovides += self.rprovides_pkg[package] for rprovide in rprovides: if fn not in cachedata.rproviders[rprovide]: cachedata.rproviders[rprovide].append(fn) for package in self.packages_dynamic: cachedata.packages_dynamic[package].append(fn) # Build hash of runtime depends and recommends for package in self.packages + [self.pn]: cachedata.rundeps[fn][package] = list(self.rdepends) + self.rdepends_pkg[package] cachedata.runrecs[fn][package] = list(self.rrecommends) + self.rrecommends_pkg[package] # Collect files we may need for possible world-dep # calculations if self.not_world: logger.debug(1, "EXCLUDE FROM WORLD: %s", fn) else: cachedata.possible_world.append(fn) # create a collection of all targets for sanity checking # tasks, such as upstream versions, license, and tools for # task and image creation. cachedata.universe_target.append(self.pn) cachedata.hashfn[fn] = self.hashfilename for task, taskhash in self.basetaskhashes.iteritems(): identifier = '%s.%s' % (fn, task) cachedata.basetaskhash[identifier] = taskhash cachedata.inherits[fn] = self.inherits cachedata.fakerootenv[fn] = self.fakerootenv cachedata.fakerootnoenv[fn] = self.fakerootnoenv cachedata.fakerootdirs[fn] = self.fakerootdirs cachedata.extradepsfunc[fn] = self.extradepsfunc class Cache(object): """ BitBake Cache implementation """ def __init__(self, data, data_hash, caches_array): # Pass caches_array information into Cache Constructor # It will be used later for deciding whether we # need extra cache file dump/load support self.caches_array = caches_array self.cachedir = data.getVar("CACHE", True) self.clean = set() self.checked = set() self.depends_cache = {} self.data = None self.data_fn = None self.cacheclean = True self.data_hash = data_hash if self.cachedir in [None, '']: self.has_cache = False logger.info("Not using a cache. " "Set CACHE = to enable.") return self.has_cache = True self.cachefile = getCacheFile(self.cachedir, "bb_cache.dat", self.data_hash) logger.debug(1, "Using cache in '%s'", self.cachedir) bb.utils.mkdirhier(self.cachedir) cache_ok = True if self.caches_array: for cache_class in self.caches_array: if type(cache_class) is type and issubclass(cache_class, RecipeInfoCommon): cachefile = getCacheFile(self.cachedir, cache_class.cachefile, self.data_hash) cache_ok = cache_ok and os.path.exists(cachefile) cache_class.init_cacheData(self) if cache_ok: self.load_cachefile() elif os.path.isfile(self.cachefile): logger.info("Out of date cache found, rebuilding...") def load_cachefile(self): # Firstly, using core cache file information for # valid checking with open(self.cachefile, "rb") as cachefile: pickled = pickle.Unpickler(cachefile) try: cache_ver = pickled.load() bitbake_ver = pickled.load() except Exception: logger.info('Invalid cache, rebuilding...') return if cache_ver != __cache_version__: logger.info('Cache version mismatch, rebuilding...') return elif bitbake_ver != bb.__version__: logger.info('Bitbake version mismatch, rebuilding...') return cachesize = 0 previous_progress = 0 previous_percent = 0 # Calculate the correct cachesize of all those cache files for cache_class in self.caches_array: if type(cache_class) is type and issubclass(cache_class, RecipeInfoCommon): cachefile = getCacheFile(self.cachedir, cache_class.cachefile, self.data_hash) with open(cachefile, "rb") as cachefile: cachesize += os.fstat(cachefile.fileno()).st_size bb.event.fire(bb.event.CacheLoadStarted(cachesize), self.data) for cache_class in self.caches_array: if type(cache_class) is type and issubclass(cache_class, RecipeInfoCommon): cachefile = getCacheFile(self.cachedir, cache_class.cachefile, self.data_hash) with open(cachefile, "rb") as cachefile: pickled = pickle.Unpickler(cachefile) while cachefile: try: key = pickled.load() value = pickled.load() except Exception: break if self.depends_cache.has_key(key): self.depends_cache[key].append(value) else: self.depends_cache[key] = [value] # only fire events on even percentage boundaries current_progress = cachefile.tell() + previous_progress current_percent = 100 * current_progress / cachesize if current_percent > previous_percent: previous_percent = current_percent bb.event.fire(bb.event.CacheLoadProgress(current_progress, cachesize), self.data) previous_progress += current_progress # Note: depends cache number is corresponding to the parsing file numbers. # The same file has several caches, still regarded as one item in the cache bb.event.fire(bb.event.CacheLoadCompleted(cachesize, len(self.depends_cache)), self.data) @staticmethod def virtualfn2realfn(virtualfn): """ Convert a virtual file name to a real one + the associated subclass keyword """ fn = virtualfn cls = "" if virtualfn.startswith('virtual:'): elems = virtualfn.split(':') cls = ":".join(elems[1:-1]) fn = elems[-1] return (fn, cls) @staticmethod def realfn2virtual(realfn, cls): """ Convert a real filename + the associated subclass keyword to a virtual filename """ if cls == "": return realfn return "virtual:" + cls + ":" + realfn @classmethod def loadDataFull(cls, virtualfn, appends, cfgData): """ Return a complete set of data for fn. To do this, we need to parse the file. """ (fn, virtual) = cls.virtualfn2realfn(virtualfn) logger.debug(1, "Parsing %s (full)", fn) cfgData.setVar("__ONLYFINALISE", virtual or "default") bb_data = cls.load_bbfile(fn, appends, cfgData) return bb_data[virtual] @classmethod def parse(cls, filename, appends, configdata, caches_array): """Parse the specified filename, returning the recipe information""" infos = [] datastores = cls.load_bbfile(filename, appends, configdata) depends = [] for variant, data in sorted(datastores.iteritems(), key=lambda i: i[0], reverse=True): virtualfn = cls.realfn2virtual(filename, variant) depends = depends + (data.getVar("__depends", False) or []) if depends and not variant: data.setVar("__depends", depends) info_array = [] for cache_class in caches_array: if type(cache_class) is type and issubclass(cache_class, RecipeInfoCommon): info = cache_class(filename, data) info_array.append(info) infos.append((virtualfn, info_array)) return infos def load(self, filename, appends, configdata): """Obtain the recipe information for the specified filename, using cached values if available, otherwise parsing. Note that if it does parse to obtain the info, it will not automatically add the information to the cache or to your CacheData. Use the add or add_info method to do so after running this, or use loadData instead.""" cached = self.cacheValid(filename, appends) if cached: infos = [] # info_array item is a list of [CoreRecipeInfo, XXXRecipeInfo] info_array = self.depends_cache[filename] for variant in info_array[0].variants: virtualfn = self.realfn2virtual(filename, variant) infos.append((virtualfn, self.depends_cache[virtualfn])) else: logger.debug(1, "Parsing %s", filename) return self.parse(filename, appends, configdata, self.caches_array) return cached, infos def loadData(self, fn, appends, cfgData, cacheData): """Load the recipe info for the specified filename, parsing and adding to the cache if necessary, and adding the recipe information to the supplied CacheData instance.""" skipped, virtuals = 0, 0 cached, infos = self.load(fn, appends, cfgData) for virtualfn, info_array in infos: if info_array[0].skipped: logger.debug(1, "Skipping %s: %s", virtualfn, info_array[0].skipreason) skipped += 1 else: self.add_info(virtualfn, info_array, cacheData, not cached) virtuals += 1 return cached, skipped, virtuals def cacheValid(self, fn, appends): """ Is the cache valid for fn? Fast version, no timestamps checked. """ if fn not in self.checked: self.cacheValidUpdate(fn, appends) # Is cache enabled? if not self.has_cache: return False if fn in self.clean: return True return False def cacheValidUpdate(self, fn, appends): """ Is the cache valid for fn? Make thorough (slower) checks including timestamps. """ # Is cache enabled? if not self.has_cache: return False self.checked.add(fn) # File isn't in depends_cache if not fn in self.depends_cache: logger.debug(2, "Cache: %s is not cached", fn) return False mtime = bb.parse.cached_mtime_noerror(fn) # Check file still exists if mtime == 0: logger.debug(2, "Cache: %s no longer exists", fn) self.remove(fn) return False info_array = self.depends_cache[fn] # Check the file's timestamp if mtime != info_array[0].timestamp: logger.debug(2, "Cache: %s changed", fn) self.remove(fn) return False # Check dependencies are still valid depends = info_array[0].file_depends if depends: for f, old_mtime in depends: fmtime = bb.parse.cached_mtime_noerror(f) # Check if file still exists if old_mtime != 0 and fmtime == 0: logger.debug(2, "Cache: %s's dependency %s was removed", fn, f) self.remove(fn) return False if (fmtime != old_mtime): logger.debug(2, "Cache: %s's dependency %s changed", fn, f) self.remove(fn) return False if hasattr(info_array[0], 'file_checksums'): for _, fl in info_array[0].file_checksums.items(): fl = fl.strip() while fl: # A .split() would be simpler but means spaces or colons in filenames would break a = fl.find(":True") b = fl.find(":False") if ((a < 0) and b) or ((b > 0) and (b < a)): f = fl[:b+6] fl = fl[b+7:] elif ((b < 0) and a) or ((a > 0) and (a < b)): f = fl[:a+5] fl = fl[a+6:] else: break fl = fl.strip() if "*" in f: continue f, exist = f.split(":") if (exist == "True" and not os.path.exists(f)) or (exist == "False" and os.path.exists(f)): logger.debug(2, "Cache: %s's file checksum list file %s changed", fn, f) self.remove(fn) return False if appends != info_array[0].appends: logger.debug(2, "Cache: appends for %s changed", fn) logger.debug(2, "%s to %s" % (str(appends), str(info_array[0].appends))) self.remove(fn) return False invalid = False for cls in info_array[0].variants: virtualfn = self.realfn2virtual(fn, cls) self.clean.add(virtualfn) if virtualfn not in self.depends_cache: logger.debug(2, "Cache: %s is not cached", virtualfn) invalid = True # If any one of the variants is not present, mark as invalid for all if invalid: for cls in info_array[0].variants: virtualfn = self.realfn2virtual(fn, cls) if virtualfn in self.clean: logger.debug(2, "Cache: Removing %s from cache", virtualfn) self.clean.remove(virtualfn) if fn in self.clean: logger.debug(2, "Cache: Marking %s as not clean", fn) self.clean.remove(fn) return False self.clean.add(fn) return True def remove(self, fn): """ Remove a fn from the cache Called from the parser in error cases """ if fn in self.depends_cache: logger.debug(1, "Removing %s from cache", fn) del self.depends_cache[fn] if fn in self.clean: logger.debug(1, "Marking %s as unclean", fn) self.clean.remove(fn) def sync(self): """ Save the cache Called from the parser when complete (or exiting) """ if not self.has_cache: return if self.cacheclean: logger.debug(2, "Cache is clean, not saving.") return file_dict = {} pickler_dict = {} for cache_class in self.caches_array: if type(cache_class) is type and issubclass(cache_class, RecipeInfoCommon): cache_class_name = cache_class.__name__ cachefile = getCacheFile(self.cachedir, cache_class.cachefile, self.data_hash) file_dict[cache_class_name] = open(cachefile, "wb") pickler_dict[cache_class_name] = pickle.Pickler(file_dict[cache_class_name], pickle.HIGHEST_PROTOCOL) pickler_dict['CoreRecipeInfo'].dump(__cache_version__) pickler_dict['CoreRecipeInfo'].dump(bb.__version__) try: for key, info_array in self.depends_cache.iteritems(): for info in info_array: if isinstance(info, RecipeInfoCommon): cache_class_name = info.__class__.__name__ pickler_dict[cache_class_name].dump(key) pickler_dict[cache_class_name].dump(info) finally: for cache_class in self.caches_array: if type(cache_class) is type and issubclass(cache_class, RecipeInfoCommon): cache_class_name = cache_class.__name__ file_dict[cache_class_name].close() del self.depends_cache @staticmethod def mtime(cachefile): return bb.parse.cached_mtime_noerror(cachefile) def add_info(self, filename, info_array, cacheData, parsed=None, watcher=None): if isinstance(info_array[0], CoreRecipeInfo) and (not info_array[0].skipped): cacheData.add_from_recipeinfo(filename, info_array) if watcher: watcher(info_array[0].file_depends) if not self.has_cache: return if (info_array[0].skipped or 'SRCREVINACTION' not in info_array[0].pv) and not info_array[0].nocache: if parsed: self.cacheclean = False self.depends_cache[filename] = info_array def add(self, file_name, data, cacheData, parsed=None): """ Save data we need into the cache """ realfn = self.virtualfn2realfn(file_name)[0] info_array = [] for cache_class in self.caches_array: if type(cache_class) is type and issubclass(cache_class, RecipeInfoCommon): info_array.append(cache_class(realfn, data)) self.add_info(file_name, info_array, cacheData, parsed) @staticmethod def load_bbfile(bbfile, appends, config): """ Load and parse one .bb build file Return the data and whether parsing resulted in the file being skipped """ chdir_back = False from bb import parse # expand tmpdir to include this topdir config.setVar('TMPDIR', config.getVar('TMPDIR', True) or "") bbfile_loc = os.path.abspath(os.path.dirname(bbfile)) oldpath = os.path.abspath(os.getcwd()) parse.cached_mtime_noerror(bbfile_loc) bb_data = config.createCopy() # The ConfHandler first looks if there is a TOPDIR and if not # then it would call getcwd(). # Previously, we chdir()ed to bbfile_loc, called the handler # and finally chdir()ed back, a couple of thousand times. We now # just fill in TOPDIR to point to bbfile_loc if there is no TOPDIR yet. if not bb_data.getVar('TOPDIR', False): chdir_back = True bb_data.setVar('TOPDIR', bbfile_loc) try: if appends: bb_data.setVar('__BBAPPEND', " ".join(appends)) bb_data = parse.handle(bbfile, bb_data) if chdir_back: os.chdir(oldpath) return bb_data except: if chdir_back: os.chdir(oldpath) raise def init(cooker): """ The Objective: Cache the minimum amount of data possible yet get to the stage of building packages (i.e. tryBuild) without reparsing any .bb files. To do this, we intercept getVar calls and only cache the variables we see being accessed. We rely on the cache getVar calls being made for all variables bitbake might need to use to reach this stage. For each cached file we need to track: * Its mtime * The mtimes of all its dependencies * Whether it caused a parse.SkipRecipe exception Files causing parsing errors are evicted from the cache. """ return Cache(cooker.configuration.data, cooker.configuration.data_hash) class CacheData(object): """ The data structures we compile from the cached data """ def __init__(self, caches_array): self.caches_array = caches_array for cache_class in self.caches_array: if type(cache_class) is type and issubclass(cache_class, RecipeInfoCommon): cache_class.init_cacheData(self) # Direct cache variables self.task_queues = {} self.preferred = {} self.tasks = {} # Indirect Cache variables (set elsewhere) self.ignored_dependencies = [] self.world_target = set() self.bbfile_priority = {} def add_from_recipeinfo(self, fn, info_array): for info in info_array: info.add_cacheData(self, fn) class MultiProcessCache(object): """ BitBake multi-process cache implementation Used by the codeparser & file checksum caches """ def __init__(self): self.cachefile = None self.cachedata = self.create_cachedata() self.cachedata_extras = self.create_cachedata() def init_cache(self, d, cache_file_name=None): cachedir = (d.getVar("PERSISTENT_DIR", True) or d.getVar("CACHE", True)) if cachedir in [None, '']: return bb.utils.mkdirhier(cachedir) self.cachefile = os.path.join(cachedir, cache_file_name or self.__class__.cache_file_name) logger.debug(1, "Using cache in '%s'", self.cachefile) glf = bb.utils.lockfile(self.cachefile + ".lock") try: with open(self.cachefile, "rb") as f: p = pickle.Unpickler(f) data, version = p.load() except: bb.utils.unlockfile(glf) return bb.utils.unlockfile(glf) if version != self.__class__.CACHE_VERSION: return self.cachedata = data def create_cachedata(self): data = [{}] return data def save_extras(self): if not self.cachefile: return glf = bb.utils.lockfile(self.cachefile + ".lock", shared=True) i = os.getpid() lf = None while not lf: lf = bb.utils.lockfile(self.cachefile + ".lock." + str(i), retry=False) if not lf or os.path.exists(self.cachefile + "-" + str(i)): if lf: bb.utils.unlockfile(lf) lf = None i = i + 1 continue with open(self.cachefile + "-" + str(i), "wb") as f: p = pickle.Pickler(f, -1) p.dump([self.cachedata_extras, self.__class__.CACHE_VERSION]) bb.utils.unlockfile(lf) bb.utils.unlockfile(glf) def merge_data(self, source, dest): for j in range(0,len(dest)): for h in source[j]: if h not in dest[j]: dest[j][h] = source[j][h] def save_merge(self): if not self.cachefile: return glf = bb.utils.lockfile(self.cachefile + ".lock") data = self.cachedata for f in [y for y in os.listdir(os.path.dirname(self.cachefile)) if y.startswith(os.path.basename(self.cachefile) + '-')]: f = os.path.join(os.path.dirname(self.cachefile), f) try: with open(f, "rb") as fd: p = pickle.Unpickler(fd) extradata, version = p.load() except (IOError, EOFError): os.unlink(f) continue if version != self.__class__.CACHE_VERSION: os.unlink(f) continue self.merge_data(extradata, data) os.unlink(f) with open(self.cachefile, "wb") as f: p = pickle.Pickler(f, -1) p.dump([data, self.__class__.CACHE_VERSION]) bb.utils.unlockfile(glf)