307 lines
9.9 KiB
Python
307 lines
9.9 KiB
Python
#!/usr/bin/env python
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# 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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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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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA.
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"""
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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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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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print "NOTE: Importing cPickle failed. Falling back to a very slow implementation."
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# __cache_version__ = "123"
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__cache_version__ = "124" # changes the __depends structure
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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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if cooker.cb is not None:
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print "NOTE: 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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if cooker.cb is not None:
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print "NOTE: 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 (ValueError, KeyError):
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bb.note("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.error("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, cooker):
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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, cooker)
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return bb_data
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def loadData(self, fn, cooker):
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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, cooker)
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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.debug(2, "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.debug(2, "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.debug(2, "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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new_mtime = bb.parse.cached_mtime(f)
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if (new_mtime > old_mtime):
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bb.debug(2, "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.debug(2, "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.debug(1, "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 exitting)
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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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try:
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return os.stat(cachefile)[8]
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except OSError:
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return 0
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def load_bbfile( self, bbfile , cooker):
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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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topdir = data.getVar('TOPDIR', cooker.configuration.data)
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if not topdir:
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topdir = os.path.abspath(os.getcwd())
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# set topdir to here
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data.setVar('TOPDIR', topdir, cooker.configuration)
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bbfile = os.path.abspath(bbfile)
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bbfile_loc = os.path.abspath(os.path.dirname(bbfile))
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# expand tmpdir to include this topdir
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data.setVar('TMPDIR', data.getVar('TMPDIR', cooker.configuration.data, 1) or "", cooker.configuration.data)
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# set topdir to location of .bb file
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topdir = bbfile_loc
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#data.setVar('TOPDIR', topdir, cfg)
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# go there
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oldpath = os.path.abspath(os.getcwd())
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if self.mtime(topdir):
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os.chdir(topdir)
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bb_data = data.init_db(cooker.configuration.data)
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try:
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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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