434 lines
15 KiB
Python
434 lines
15 KiB
Python
# ex:ts=4:sw=4:sts=4:et
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# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
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#
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# BitBake 'Event' implementation
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#
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# Caching of bitbake variables before task execution
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# Copyright (C) 2006 Richard Purdie
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# but small sections based on code from bin/bitbake:
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# Copyright (C) 2003, 2004 Chris Larson
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# Copyright (C) 2003, 2004 Phil Blundell
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# Copyright (C) 2003 - 2005 Michael 'Mickey' Lauer
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# Copyright (C) 2005 Holger Hans Peter Freyther
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# Copyright (C) 2005 ROAD GmbH
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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import os, re
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import bb.data
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import bb.utils
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from sets import Set
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try:
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import cPickle as pickle
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except ImportError:
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import pickle
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bb.msg.note(1, bb.msg.domain.Cache, "Importing cPickle failed. Falling back to a very slow implementation.")
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__cache_version__ = "126"
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class Cache:
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"""
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BitBake Cache implementation
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"""
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def __init__(self, cooker):
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self.cachedir = bb.data.getVar("CACHE", cooker.configuration.data, True)
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self.clean = {}
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self.depends_cache = {}
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self.data = None
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self.data_fn = None
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if self.cachedir in [None, '']:
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self.has_cache = False
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bb.msg.note(1, bb.msg.domain.Cache, "Not using a cache. Set CACHE = <directory> to enable.")
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else:
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self.has_cache = True
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self.cachefile = os.path.join(self.cachedir,"bb_cache.dat")
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bb.msg.debug(1, bb.msg.domain.Cache, "Using cache in '%s'" % self.cachedir)
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try:
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os.stat( self.cachedir )
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except OSError:
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bb.mkdirhier( self.cachedir )
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if self.has_cache and (self.mtime(self.cachefile)):
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try:
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p = pickle.Unpickler( file(self.cachefile,"rb"))
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self.depends_cache, version_data = p.load()
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if version_data['CACHE_VER'] != __cache_version__:
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raise ValueError, 'Cache Version Mismatch'
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if version_data['BITBAKE_VER'] != bb.__version__:
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raise ValueError, 'Bitbake Version Mismatch'
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except EOFError:
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bb.msg.note(1, bb.msg.domain.Cache, "Truncated cache found, rebuilding...")
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self.depends_cache = {}
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except (ValueError, KeyError):
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bb.msg.note(1, bb.msg.domain.Cache, "Invalid cache found, rebuilding...")
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self.depends_cache = {}
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if self.depends_cache:
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for fn in self.depends_cache.keys():
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self.clean[fn] = ""
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self.cacheValidUpdate(fn)
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def getVar(self, var, fn, exp = 0):
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"""
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Gets the value of a variable
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(similar to getVar in the data class)
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There are two scenarios:
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1. We have cached data - serve from depends_cache[fn]
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2. We're learning what data to cache - serve from data
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backend but add a copy of the data to the cache.
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"""
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if fn in self.clean:
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return self.depends_cache[fn][var]
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if not fn in self.depends_cache:
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self.depends_cache[fn] = {}
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if fn != self.data_fn:
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# We're trying to access data in the cache which doesn't exist
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# yet setData hasn't been called to setup the right access. Very bad.
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bb.msg.error(bb.msg.domain.Cache, "Parsing error data_fn %s and fn %s don't match" % (self.data_fn, fn))
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result = bb.data.getVar(var, self.data, exp)
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self.depends_cache[fn][var] = result
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return result
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def setData(self, fn, data):
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"""
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Called to prime bb_cache ready to learn which variables to cache.
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Will be followed by calls to self.getVar which aren't cached
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but can be fulfilled from self.data.
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"""
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self.data_fn = fn
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self.data = data
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# Make sure __depends makes the depends_cache
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self.getVar("__depends", fn, True)
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self.depends_cache[fn]["CACHETIMESTAMP"] = bb.parse.cached_mtime(fn)
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def loadDataFull(self, fn, cfgData):
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"""
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Return a complete set of data for fn.
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To do this, we need to parse the file.
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"""
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bb_data, skipped = self.load_bbfile(fn, cfgData)
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return bb_data
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def loadData(self, fn, cfgData):
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"""
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Load a subset of data for fn.
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If the cached data is valid we do nothing,
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To do this, we need to parse the file and set the system
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to record the variables accessed.
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Return the cache status and whether the file was skipped when parsed
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"""
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if self.cacheValid(fn):
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if "SKIPPED" in self.depends_cache[fn]:
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return True, True
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return True, False
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bb_data, skipped = self.load_bbfile(fn, cfgData)
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self.setData(fn, bb_data)
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return False, skipped
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def cacheValid(self, fn):
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"""
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Is the cache valid for fn?
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Fast version, no timestamps checked.
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"""
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# Is cache enabled?
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if not self.has_cache:
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return False
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if fn in self.clean:
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return True
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return False
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def cacheValidUpdate(self, fn):
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"""
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Is the cache valid for fn?
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Make thorough (slower) checks including timestamps.
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"""
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# Is cache enabled?
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if not self.has_cache:
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return False
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# Check file still exists
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if self.mtime(fn) == 0:
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bb.msg.debug(2, bb.msg.domain.Cache, "Cache: %s not longer exists" % fn)
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self.remove(fn)
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return False
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# File isn't in depends_cache
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if not fn in self.depends_cache:
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bb.msg.debug(2, bb.msg.domain.Cache, "Cache: %s is not cached" % fn)
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self.remove(fn)
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return False
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# Check the file's timestamp
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if bb.parse.cached_mtime(fn) > self.getVar("CACHETIMESTAMP", fn, True):
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bb.msg.debug(2, bb.msg.domain.Cache, "Cache: %s changed" % fn)
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self.remove(fn)
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return False
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# Check dependencies are still valid
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depends = self.getVar("__depends", fn, True)
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for f,old_mtime in depends:
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# Check if file still exists
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if self.mtime(f) == 0:
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return False
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new_mtime = bb.parse.cached_mtime(f)
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if (new_mtime > old_mtime):
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bb.msg.debug(2, bb.msg.domain.Cache, "Cache: %s's dependency %s changed" % (fn, f))
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self.remove(fn)
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return False
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bb.msg.debug(2, bb.msg.domain.Cache, "Depends Cache: %s is clean" % fn)
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if not fn in self.clean:
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self.clean[fn] = ""
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return True
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def skip(self, fn):
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"""
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Mark a fn as skipped
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Called from the parser
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"""
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if not fn in self.depends_cache:
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self.depends_cache[fn] = {}
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self.depends_cache[fn]["SKIPPED"] = "1"
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def remove(self, fn):
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"""
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Remove a fn from the cache
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Called from the parser in error cases
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"""
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bb.msg.debug(1, bb.msg.domain.Cache, "Removing %s from cache" % fn)
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if fn in self.depends_cache:
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del self.depends_cache[fn]
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if fn in self.clean:
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del self.clean[fn]
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def sync(self):
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"""
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Save the cache
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Called from the parser when complete (or exiting)
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"""
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if not self.has_cache:
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return
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version_data = {}
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version_data['CACHE_VER'] = __cache_version__
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version_data['BITBAKE_VER'] = bb.__version__
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p = pickle.Pickler(file(self.cachefile, "wb" ), -1 )
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p.dump([self.depends_cache, version_data])
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def mtime(self, cachefile):
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return bb.parse.cached_mtime_noerror(cachefile)
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def handle_data(self, file_name, cacheData):
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"""
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Save data we need into the cache
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"""
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pn = self.getVar('PN', file_name, True)
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pe = self.getVar('PE', file_name, True) or "0"
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pv = self.getVar('PV', file_name, True)
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pr = self.getVar('PR', file_name, True)
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dp = int(self.getVar('DEFAULT_PREFERENCE', file_name, True) or "0")
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provides = Set([pn] + (self.getVar("PROVIDES", file_name, True) or "").split())
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depends = bb.utils.explode_deps(self.getVar("DEPENDS", file_name, True) or "")
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packages = (self.getVar('PACKAGES', file_name, True) or "").split()
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packages_dynamic = (self.getVar('PACKAGES_DYNAMIC', file_name, True) or "").split()
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rprovides = (self.getVar("RPROVIDES", file_name, True) or "").split()
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cacheData.task_queues[file_name] = self.getVar("_task_graph", file_name, True)
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cacheData.task_deps[file_name] = self.getVar("_task_deps", file_name, True)
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# build PackageName to FileName lookup table
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if pn not in cacheData.pkg_pn:
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cacheData.pkg_pn[pn] = []
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cacheData.pkg_pn[pn].append(file_name)
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cacheData.stamp[file_name] = self.getVar('STAMP', file_name, True)
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# build FileName to PackageName lookup table
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cacheData.pkg_fn[file_name] = pn
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cacheData.pkg_pepvpr[file_name] = (pe,pv,pr)
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cacheData.pkg_dp[file_name] = dp
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# Build forward and reverse provider hashes
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# Forward: virtual -> [filenames]
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# Reverse: PN -> [virtuals]
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if pn not in cacheData.pn_provides:
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cacheData.pn_provides[pn] = Set()
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cacheData.pn_provides[pn] |= provides
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for provide in provides:
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if provide not in cacheData.providers:
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cacheData.providers[provide] = []
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cacheData.providers[provide].append(file_name)
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cacheData.deps[file_name] = Set()
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for dep in depends:
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cacheData.all_depends.add(dep)
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cacheData.deps[file_name].add(dep)
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# Build reverse hash for PACKAGES, so runtime dependencies
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# can be be resolved (RDEPENDS, RRECOMMENDS etc.)
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for package in packages:
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if not package in cacheData.packages:
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cacheData.packages[package] = []
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cacheData.packages[package].append(file_name)
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rprovides += (self.getVar("RPROVIDES_%s" % package, file_name, 1) or "").split()
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for package in packages_dynamic:
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if not package in cacheData.packages_dynamic:
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cacheData.packages_dynamic[package] = []
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cacheData.packages_dynamic[package].append(file_name)
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for rprovide in rprovides:
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if not rprovide in cacheData.rproviders:
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cacheData.rproviders[rprovide] = []
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cacheData.rproviders[rprovide].append(file_name)
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# Build hash of runtime depends and rececommends
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def add_dep(deplist, deps):
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for dep in deps:
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if not dep in deplist:
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deplist[dep] = ""
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if not file_name in cacheData.rundeps:
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cacheData.rundeps[file_name] = {}
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if not file_name in cacheData.runrecs:
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cacheData.runrecs[file_name] = {}
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for package in packages + [pn]:
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if not package in cacheData.rundeps[file_name]:
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cacheData.rundeps[file_name][package] = {}
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if not package in cacheData.runrecs[file_name]:
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cacheData.runrecs[file_name][package] = {}
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add_dep(cacheData.rundeps[file_name][package], bb.utils.explode_deps(self.getVar('RDEPENDS', file_name, True) or ""))
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add_dep(cacheData.runrecs[file_name][package], bb.utils.explode_deps(self.getVar('RRECOMMENDS', file_name, True) or ""))
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add_dep(cacheData.rundeps[file_name][package], bb.utils.explode_deps(self.getVar("RDEPENDS_%s" % package, file_name, True) or ""))
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add_dep(cacheData.runrecs[file_name][package], bb.utils.explode_deps(self.getVar("RRECOMMENDS_%s" % package, file_name, True) or ""))
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# Collect files we may need for possible world-dep
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# calculations
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if not self.getVar('BROKEN', file_name, True) and not self.getVar('EXCLUDE_FROM_WORLD', file_name, True):
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cacheData.possible_world.append(file_name)
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def load_bbfile( self, bbfile , config):
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"""
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Load and parse one .bb build file
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Return the data and whether parsing resulted in the file being skipped
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"""
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import bb
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from bb import utils, data, parse, debug, event, fatal
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# expand tmpdir to include this topdir
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data.setVar('TMPDIR', data.getVar('TMPDIR', config, 1) or "", config)
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bbfile_loc = os.path.abspath(os.path.dirname(bbfile))
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oldpath = os.path.abspath(os.getcwd())
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if self.mtime(bbfile_loc):
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os.chdir(bbfile_loc)
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bb_data = data.init_db(config)
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try:
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bb_data = parse.handle(bbfile, bb_data) # read .bb data
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os.chdir(oldpath)
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return bb_data, False
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except bb.parse.SkipPackage:
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os.chdir(oldpath)
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return bb_data, True
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except:
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os.chdir(oldpath)
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raise
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def init(cooker):
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"""
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The Objective: Cache the minimum amount of data possible yet get to the
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stage of building packages (i.e. tryBuild) without reparsing any .bb files.
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To do this, we intercept getVar calls and only cache the variables we see
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being accessed. We rely on the cache getVar calls being made for all
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variables bitbake might need to use to reach this stage. For each cached
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file we need to track:
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* Its mtime
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* The mtimes of all its dependencies
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* Whether it caused a parse.SkipPackage exception
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Files causing parsing errors are evicted from the cache.
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"""
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return Cache(cooker)
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#============================================================================#
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# CacheData
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#============================================================================#
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class CacheData:
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"""
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The data structures we compile from the cached data
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"""
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def __init__(self):
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"""
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Direct cache variables
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(from Cache.handle_data)
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"""
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self.providers = {}
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self.rproviders = {}
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self.packages = {}
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self.packages_dynamic = {}
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self.possible_world = []
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self.pkg_pn = {}
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self.pkg_fn = {}
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self.pkg_pepvpr = {}
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self.pkg_dp = {}
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self.pn_provides = {}
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self.all_depends = Set()
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self.deps = {}
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self.rundeps = {}
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self.runrecs = {}
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self.task_queues = {}
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self.task_deps = {}
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self.stamp = {}
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self.preferred = {}
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"""
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Indirect Cache variables
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(set elsewhere)
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"""
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self.ignored_dependencies = []
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self.world_target = Set()
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self.bbfile_priority = {}
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self.bbfile_config_priorities = []
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