path: root/bitbake/lib/bb/cooker.py

#!/usr/bin/env python
# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
#
# 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
# Copyright (C) 2006 - 2007 Richard Purdie
#
# 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.

from __future__ import print_function
import sys, os, glob, os.path, re, time
import atexit
import itertools
import logging
import multiprocessing
import sre_constants
import threading
from cStringIO import StringIO
from contextlib import closing
from functools import wraps
from collections import defaultdict
import bb, bb.exceptions, bb.command
from bb import utils, data, parse, event, cache, providers, taskdata, runqueue
import Queue
import prserv.serv

logger      = logging.getLogger("BitBake")
collectlog  = logging.getLogger("BitBake.Collection")
buildlog    = logging.getLogger("BitBake.Build")
parselog    = logging.getLogger("BitBake.Parsing")
providerlog = logging.getLogger("BitBake.Provider")

class NoSpecificMatch(bb.BBHandledException):
    """
    Exception raised when no or multiple file matches are found
    """

class NothingToBuild(Exception):
    """
    Exception raised when there is nothing to build
    """

class CollectionError(bb.BBHandledException):
    """
    Exception raised when layer configuration is incorrect
    """

class state:
    initial, parsing, running, shutdown, forceshutdown, stopped = range(6)


class SkippedPackage:
    def __init__(self, info = None, reason = None):
        self.pn = None
        self.skipreason = None
        self.provides = None
        self.rprovides = None

        if info:
            self.pn = info.pn
            self.skipreason = info.skipreason
            self.provides = info.provides
            self.rprovides = info.rprovides
        elif reason:
            self.skipreason = reason


class CookerFeatures(object):
    _feature_list = [HOB_EXTRA_CACHES, SEND_DEPENDS_TREE] = range(2)

    def __init__(self):
        self._features=set()

    def setFeature(self, f):
        # validate we got a request for a feature we support
        if f not in CookerFeatures._feature_list:
            return
        self._features.add(f)

    def __contains__(self, f):
        return f in self._features

    def __iter__(self):
        return self._features.__iter__()

    def next(self):
        return self._features.next()


#============================================================================#
# BBCooker
#============================================================================#
class BBCooker:
    """
    Manages one bitbake build run
    """

    def __init__(self, configuration):
        self.recipecache = None
        self.skiplist = {}
        self.featureset = CookerFeatures()

        self.configuration = configuration

        self.loadConfigurationData()

        # Take a lock so only one copy of bitbake can run against a given build
        # directory at a time
        lockfile = self.data.expand("${TOPDIR}/bitbake.lock")
        self.lock = bb.utils.lockfile(lockfile, False, False)
        if not self.lock:
            bb.fatal("Only one copy of bitbake should be run against a build directory")

        # TOSTOP must not be set or our children will hang when they output
        fd = sys.stdout.fileno()
        if os.isatty(fd):
            import termios
            tcattr = termios.tcgetattr(fd)
            if tcattr[3] & termios.TOSTOP:
                buildlog.info("The terminal had the TOSTOP bit set, clearing...")
                tcattr[3] = tcattr[3] & ~termios.TOSTOP
                termios.tcsetattr(fd, termios.TCSANOW, tcattr)

        self.command = bb.command.Command(self)
        self.state = state.initial

        self.parser = None

    def initConfigurationData(self):

        self.state = state.initial

        self.caches_array = []

        all_extra_cache_names = []
        # We hardcode all known cache types in a single place, here.
        if CookerFeatures.HOB_EXTRA_CACHES in self.featureset:
            all_extra_cache_names.append("bb.cache_extra:HobRecipeInfo")

        caches_name_array = ['bb.cache:CoreRecipeInfo'] + all_extra_cache_names

        # At least CoreRecipeInfo will be loaded, so caches_array will never be empty!
        # This is the entry point, no further check needed!
        for var in caches_name_array:
            try:
                module_name, cache_name = var.split(':')
                module = __import__(module_name, fromlist=(cache_name,))
                self.caches_array.append(getattr(module, cache_name))
            except ImportError as exc:
                logger.critical("Unable to import extra RecipeInfo '%s' from '%s': %s" % (cache_name, module_name, exc))
                sys.exit("FATAL: Failed to import extra cache class '%s'." % cache_name)

        self.databuilder = bb.cookerdata.CookerDataBuilder(self.configuration, False)
        self.data = self.databuilder.data

    def enableDataTracking(self):
        self.configuration.tracking = True
        self.data.enableTracking()

    def disableDataTracking(self):
        self.configuration.tracking = False
        self.data.disableTracking()

    def loadConfigurationData(self):
        self.initConfigurationData()
        self.databuilder.parseBaseConfiguration()
        self.data = self.databuilder.data
        self.data_hash = self.databuilder.data_hash

        #
        # Special updated configuration we use for firing events
        #
        self.event_data = bb.data.createCopy(self.data)
        bb.data.update_data(self.event_data)
        bb.parse.init_parser(self.event_data)

    def modifyConfigurationVar(self, var, val, default_file, op):
        if op == "append":
            self.appendConfigurationVar(var, val, default_file)
        elif op == "set":
            self.saveConfigurationVar(var, val, default_file)

    def appendConfigurationVar(self, var, val, default_file):
        #add append var operation to the end of default_file
        default_file = bb.cookerdata.findConfigFile(default_file, self.data)

        with open(default_file, 'r') as f:
            contents = f.readlines()
        f.close()

        total = ""
        for c in contents:
            total += c

        total += "#added by bitbake"
        total += "\n%s += \"%s\"\n" % (var, val)

        with open(default_file, 'w') as f:
            f.write(total)
        f.close()

        #add to history
        loginfo = {"op":append, "file":default_file, "line":total.count("\n")}
        self.data.appendVar(var, val, **loginfo)

    def saveConfigurationVar(self, var, val, default_file):

        replaced = False
        #do not save if nothing changed
        if str(val) == self.data.getVar(var):
            return

        conf_files = self.data.varhistory.get_variable_files(var)

        #format the value when it is a list
        if isinstance(val, list):
            listval = ""
            for value in val:
                listval += "%s   " % value
            val = listval

        topdir = self.data.getVar("TOPDIR")

        #comment or replace operations made on var
        for conf_file in conf_files:
            if topdir in conf_file:
                with open(conf_file, 'r') as f:
                    contents = f.readlines()
                f.close()

                lines = self.data.varhistory.get_variable_lines(var, conf_file)
                for line in lines:
                    total = ""
                    i = 0
                    for c in contents:
                        total += c
                        i = i + 1
                        if i==int(line):
                            end_index = len(total)
                    index = total.rfind(var, 0, end_index)

                    begin_line = total.count("\n",0,index)
                    end_line = int(line)

                    #check if the variable was saved before in the same way
                    #if true it replace the place where the variable was declared
                    #else it comments it
                    if contents[begin_line-1]== "#added by bitbake\n":
                        contents[begin_line] = "%s = \"%s\"\n" % (var, val)
                        replaced = True
                    else:
                        for ii in range(begin_line, end_line):
                            contents[ii] = "#" + contents[ii]

                total = ""
                for c in contents:
                    total += c
                with open(conf_file, 'w') as f:
                    f.write(total)
                f.close()

        if replaced == False:
            #remove var from history
            self.data.varhistory.del_var_history(var)

            #add var to the end of default_file
            default_file = bb.cookerdata.findConfigFile(default_file, self.data)

            with open(default_file, 'r') as f:
                contents = f.readlines()
            f.close()

            total = ""
            for c in contents:
                total += c

            #add the variable on a single line, to be easy to replace the second time
            total += "\n#added by bitbake"
            total += "\n%s = \"%s\"\n" % (var, val)

            with open(default_file, 'w') as f:
                f.write(total)
            f.close()

            #add to history
            loginfo = {"op":set, "file":default_file, "line":total.count("\n")}
            self.data.setVar(var, val, **loginfo)

    def createConfigFile(self, name):
        path = os.getcwd()
        confpath = os.path.join(path, "conf", name)
        open(confpath, 'w').close()

    def parseConfiguration(self):

        # Set log file verbosity
        verboselogs = bb.utils.to_boolean(self.data.getVar("BB_VERBOSE_LOGS", "0"))
        if verboselogs:
            bb.msg.loggerVerboseLogs = True

        # Change nice level if we're asked to
        nice = self.data.getVar("BB_NICE_LEVEL", True)
        if nice:
            curnice = os.nice(0)
            nice = int(nice) - curnice
            buildlog.verbose("Renice to %s " % os.nice(nice))

        if self.recipecache:
            del self.recipecache
        self.recipecache = bb.cache.CacheData(self.caches_array)

        self.handleCollections( self.data.getVar("BBFILE_COLLECTIONS", True) )

    def runCommands(self, server, data, abort):
        """
        Run any queued asynchronous command
        This is done by the idle handler so it runs in true context rather than
        tied to any UI.
        """

        return self.command.runAsyncCommand()

    def showVersions(self):

        pkg_pn = self.recipecache.pkg_pn
        (latest_versions, preferred_versions) = bb.providers.findProviders(self.data, self.recipecache, pkg_pn)

        logger.plain("%-35s %25s %25s", "Recipe Name", "Latest Version", "Preferred Version")
        logger.plain("%-35s %25s %25s\n", "===========", "==============", "=================")

        for p in sorted(pkg_pn):
            pref = preferred_versions[p]
            latest = latest_versions[p]

            prefstr = pref[0][0] + ":" + pref[0][1] + '-' + pref[0][2]
            lateststr = latest[0][0] + ":" + latest[0][1] + "-" + latest[0][2]

            if pref == latest:
                prefstr = ""

            logger.plain("%-35s %25s %25s", p, lateststr, prefstr)

    def showEnvironment(self, buildfile = None, pkgs_to_build = []):
        """
        Show the outer or per-package environment
        """
        fn = None
        envdata = None

        if buildfile:
            # Parse the configuration here. We need to do it explicitly here since
            # this showEnvironment() code path doesn't use the cache
            self.parseConfiguration()

            fn, cls = bb.cache.Cache.virtualfn2realfn(buildfile)
            fn = self.matchFile(fn)
            fn = bb.cache.Cache.realfn2virtual(fn, cls)
        elif len(pkgs_to_build) == 1:
            ignore = self.data.getVar("ASSUME_PROVIDED", True) or ""
            if pkgs_to_build[0] in set(ignore.split()):
                bb.fatal("%s is in ASSUME_PROVIDED" % pkgs_to_build[0])

            taskdata, runlist, pkgs_to_build = self.buildTaskData(pkgs_to_build, None, self.configuration.abort)

            targetid = taskdata.getbuild_id(pkgs_to_build[0])
            fnid = taskdata.build_targets[targetid][0]
            fn = taskdata.fn_index[fnid]
        else:
            envdata = self.data

        if fn:
            try:
                envdata = bb.cache.Cache.loadDataFull(fn, self.collection.get_file_appends(fn), self.data)
            except Exception as e:
                parselog.exception("Unable to read %s", fn)
                raise

        # Display history
        with closing(StringIO()) as env:
            self.data.inchistory.emit(env)
            logger.plain(env.getvalue())

        # emit variables and shell functions
        data.update_data(envdata)
        with closing(StringIO()) as env:
            data.emit_env(env, envdata, True)
            logger.plain(env.getvalue())

        # emit the metadata which isnt valid shell
        data.expandKeys(envdata)
        for e in envdata.keys():
            if data.getVarFlag( e, 'python', envdata ):
                logger.plain("\npython %s () {\n%s}\n", e, data.getVar(e, envdata, 1))


    def buildTaskData(self, pkgs_to_build, task, abort):
        """
        Prepare a runqueue and taskdata object for iteration over pkgs_to_build
        """
        bb.event.fire(bb.event.TreeDataPreparationStarted(), self.data)

        # A task of None means use the default task
        if task is None:
            task = self.configuration.cmd

        fulltargetlist = self.checkPackages(pkgs_to_build)

        localdata = data.createCopy(self.data)
        bb.data.update_data(localdata)
        bb.data.expandKeys(localdata)
        taskdata = bb.taskdata.TaskData(abort, skiplist=self.skiplist)

        current = 0
        runlist = []
        for k in fulltargetlist:
            taskdata.add_provider(localdata, self.recipecache, k)
            current += 1
            runlist.append([k, "do_%s" % task])
            bb.event.fire(bb.event.TreeDataPreparationProgress(current, len(fulltargetlist)), self.data)
        taskdata.add_unresolved(localdata, self.recipecache)
        bb.event.fire(bb.event.TreeDataPreparationCompleted(len(fulltargetlist)), self.data)
        return taskdata, runlist, fulltargetlist

    def prepareTreeData(self, pkgs_to_build, task):
        """
        Prepare a runqueue and taskdata object for iteration over pkgs_to_build
        """

        # We set abort to False here to prevent unbuildable targets raising
        # an exception when we're just generating data
        taskdata, runlist, pkgs_to_build = self.buildTaskData(pkgs_to_build, task, False)

        return runlist, taskdata
    
    ######## WARNING : this function requires cache_extra to be enabled ########

    def generateTaskDepTreeData(self, pkgs_to_build, task):
        """
        Create a dependency graph of pkgs_to_build including reverse dependency
        information.
        """
        runlist, taskdata = self.prepareTreeData(pkgs_to_build, task)
        rq = bb.runqueue.RunQueue(self, self.data, self.recipecache, taskdata, runlist)
        rq.rqdata.prepare()
        return self.buildDependTree(rq, taskdata)


    def buildDependTree(self, rq, taskdata):
        seen_fnids = []
        depend_tree = {}
        depend_tree["depends"] = {}
        depend_tree["tdepends"] = {}
        depend_tree["pn"] = {}
        depend_tree["rdepends-pn"] = {}
        depend_tree["packages"] = {}
        depend_tree["rdepends-pkg"] = {}
        depend_tree["rrecs-pkg"] = {}

        for task in xrange(len(rq.rqdata.runq_fnid)):
            taskname = rq.rqdata.runq_task[task]
            fnid = rq.rqdata.runq_fnid[task]
            fn = taskdata.fn_index[fnid]
            pn = self.recipecache.pkg_fn[fn]
            version  = "%s:%s-%s" % self.recipecache.pkg_pepvpr[fn]
            if pn not in depend_tree["pn"]:
                depend_tree["pn"][pn] = {}
                depend_tree["pn"][pn]["filename"] = fn
                depend_tree["pn"][pn]["version"] = version

                # if we have extra caches, list all attributes they bring in
                extra_info = []
                for cache_class in self.caches_array:
                    if type(cache_class) is type and issubclass(cache_class, bb.cache.RecipeInfoCommon) and hasattr(cache_class, 'cachefields'):
                        cachefields = getattr(cache_class, 'cachefields', [])
                        extra_info = extra_info + cachefields

                # for all attributes stored, add them to the dependency tree
                for ei in extra_info:
                    depend_tree["pn"][pn][ei] = vars(self.recipecache)[ei][fn]


            for dep in rq.rqdata.runq_depends[task]:
                depfn = taskdata.fn_index[rq.rqdata.runq_fnid[dep]]
                deppn = self.recipecache.pkg_fn[depfn]
                dotname = "%s.%s" % (pn, rq.rqdata.runq_task[task])
                if not dotname in depend_tree["tdepends"]:
                    depend_tree["tdepends"][dotname] = []
                depend_tree["tdepends"][dotname].append("%s.%s" % (deppn, rq.rqdata.runq_task[dep]))
            if fnid not in seen_fnids:
                seen_fnids.append(fnid)
                packages = []

                depend_tree["depends"][pn] = []
                for dep in taskdata.depids[fnid]:
                    depend_tree["depends"][pn].append(taskdata.build_names_index[dep])

                depend_tree["rdepends-pn"][pn] = []
                for rdep in taskdata.rdepids[fnid]:
                    depend_tree["rdepends-pn"][pn].append(taskdata.run_names_index[rdep])

                rdepends = self.recipecache.rundeps[fn]
                for package in rdepends:
                    depend_tree["rdepends-pkg"][package] = []
                    for rdepend in rdepends[package]:
                        depend_tree["rdepends-pkg"][package].append(rdepend)
                    packages.append(package)

                rrecs = self.recipecache.runrecs[fn]
                for package in rrecs:
                    depend_tree["rrecs-pkg"][package] = []
                    for rdepend in rrecs[package]:
                        depend_tree["rrecs-pkg"][package].append(rdepend)
                    if not package in packages:
                        packages.append(package)

                for package in packages:
                    if package not in depend_tree["packages"]:
                        depend_tree["packages"][package] = {}
                        depend_tree["packages"][package]["pn"] = pn
                        depend_tree["packages"][package]["filename"] = fn
                        depend_tree["packages"][package]["version"] = version

        return depend_tree

    ######## WARNING : this function requires cache_extra to be enabled ########
    def generatePkgDepTreeData(self, pkgs_to_build, task):
        """
        Create a dependency tree of pkgs_to_build, returning the data.
        """
        _, taskdata = self.prepareTreeData(pkgs_to_build, task)
        tasks_fnid = []
        if len(taskdata.tasks_name) != 0:
            for task in xrange(len(taskdata.tasks_name)):
                tasks_fnid.append(taskdata.tasks_fnid[task])

        seen_fnids = []
        depend_tree = {}
        depend_tree["depends"] = {}
        depend_tree["pn"] = {}
        depend_tree["rdepends-pn"] = {}
        depend_tree["rdepends-pkg"] = {}
        depend_tree["rrecs-pkg"] = {}

        # if we have extra caches, list all attributes they bring in
        extra_info = []
        for cache_class in self.caches_array:
            if type(cache_class) is type and issubclass(cache_class, bb.cache.RecipeInfoCommon) and hasattr(cache_class, 'cachefields'):
                cachefields = getattr(cache_class, 'cachefields', [])
                extra_info = extra_info + cachefields

        for task in xrange(len(tasks_fnid)):
            fnid = tasks_fnid[task]
            fn = taskdata.fn_index[fnid]
            pn = self.recipecache.pkg_fn[fn]

            if pn not in depend_tree["pn"]:
                depend_tree["pn"][pn] = {}
                depend_tree["pn"][pn]["filename"] = fn
                version  = "%s:%s-%s" % self.recipecache.pkg_pepvpr[fn]
                depend_tree["pn"][pn]["version"] = version
                rdepends = self.recipecache.rundeps[fn]
                rrecs = self.recipecache.runrecs[fn]
                depend_tree["pn"][pn]["inherits"] = self.recipecache.inherits.get(fn, None)

                # for all extra attributes stored, add them to the dependency tree
                for ei in extra_info:
                    depend_tree["pn"][pn][ei] = vars(self.recipecache)[ei][fn]

            if fnid not in seen_fnids:
                seen_fnids.append(fnid)

                depend_tree["depends"][pn] = []
                for dep in taskdata.depids[fnid]:
                    item = taskdata.build_names_index[dep]
                    pn_provider = ""
                    targetid = taskdata.getbuild_id(item)
                    if targetid in taskdata.build_targets and taskdata.build_targets[targetid]:
                        id = taskdata.build_targets[targetid][0]
                        fn_provider = taskdata.fn_index[id]
                        pn_provider = self.recipecache.pkg_fn[fn_provider]
                    else:
                        pn_provider = item
                    depend_tree["depends"][pn].append(pn_provider)

                depend_tree["rdepends-pn"][pn] = []
                for rdep in taskdata.rdepids[fnid]:
                    item = taskdata.run_names_index[rdep]
                    pn_rprovider = ""
                    targetid = taskdata.getrun_id(item)
                    if targetid in taskdata.run_targets and taskdata.run_targets[targetid]:
                        id = taskdata.run_targets[targetid][0]
                        fn_rprovider = taskdata.fn_index[id]
                        pn_rprovider = self.recipecache.pkg_fn[fn_rprovider]
                    else:
                        pn_rprovider = item
                    depend_tree["rdepends-pn"][pn].append(pn_rprovider)

                depend_tree["rdepends-pkg"].update(rdepends)
                depend_tree["rrecs-pkg"].update(rrecs)

        return depend_tree

    def generateDepTreeEvent(self, pkgs_to_build, task):
        """
        Create a task dependency graph of pkgs_to_build.
        Generate an event with the result
        """
        depgraph = self.generateTaskDepTreeData(pkgs_to_build, task)
        bb.event.fire(bb.event.DepTreeGenerated(depgraph), self.data)

    def generateDotGraphFiles(self, pkgs_to_build, task):
        """
        Create a task dependency graph of pkgs_to_build.
        Save the result to a set of .dot files.
        """

        depgraph = self.generateTaskDepTreeData(pkgs_to_build, task)

        # Prints a flattened form of package-depends below where subpackages of a package are merged into the main pn
        depends_file = file('pn-depends.dot', 'w' )
        buildlist_file = file('pn-buildlist', 'w' )
        print("digraph depends {", file=depends_file)
        for pn in depgraph["pn"]:
            fn = depgraph["pn"][pn]["filename"]
            version = depgraph["pn"][pn]["version"]
            print('"%s" [label="%s %s\\n%s"]' % (pn, pn, version, fn), file=depends_file)
            print("%s" % pn, file=buildlist_file)
        buildlist_file.close()
        logger.info("PN build list saved to 'pn-buildlist'")
        for pn in depgraph["depends"]:
            for depend in depgraph["depends"][pn]:
                print('"%s" -> "%s"' % (pn, depend), file=depends_file)
        for pn in depgraph["rdepends-pn"]:
            for rdepend in depgraph["rdepends-pn"][pn]:
                print('"%s" -> "%s" [style=dashed]' % (pn, rdepend), file=depends_file)
        print("}", file=depends_file)
        logger.info("PN dependencies saved to 'pn-depends.dot'")

        depends_file = file('package-depends.dot', 'w' )
        print("digraph depends {", file=depends_file)
        for package in depgraph["packages"]:
            pn = depgraph["packages"][package]["pn"]
            fn = depgraph["packages"][package]["filename"]
            version = depgraph["packages"][package]["version"]
            if package == pn:
                print('"%s" [label="%s %s\\n%s"]' % (pn, pn, version, fn), file=depends_file)
            else:
                print('"%s" [label="%s(%s) %s\\n%s"]' % (package, package, pn, version, fn), file=depends_file)
            for depend in depgraph["depends"][pn]:
                print('"%s" -> "%s"' % (package, depend), file=depends_file)
        for package in depgraph["rdepends-pkg"]:
            for rdepend in depgraph["rdepends-pkg"][package]:
                print('"%s" -> "%s" [style=dashed]' % (package, rdepend), file=depends_file)
        for package in depgraph["rrecs-pkg"]:
            for rdepend in depgraph["rrecs-pkg"][package]:
                print('"%s" -> "%s" [style=dashed]' % (package, rdepend), file=depends_file)
        print("}", file=depends_file)
        logger.info("Package dependencies saved to 'package-depends.dot'")

        tdepends_file = file('task-depends.dot', 'w' )
        print("digraph depends {", file=tdepends_file)
        for task in depgraph["tdepends"]:
            (pn, taskname) = task.rsplit(".", 1)
            fn = depgraph["pn"][pn]["filename"]
            version = depgraph["pn"][pn]["version"]
            print('"%s.%s" [label="%s %s\\n%s\\n%s"]' % (pn, taskname, pn, taskname, version, fn), file=tdepends_file)
            for dep in depgraph["tdepends"][task]:
                print('"%s" -> "%s"' % (task, dep), file=tdepends_file)
        print("}", file=tdepends_file)
        logger.info("Task dependencies saved to 'task-depends.dot'")

    def show_appends_with_no_recipes( self ):
        recipes = set(os.path.basename(f)
                      for f in self.recipecache.pkg_fn.iterkeys())
        recipes |= set(os.path.basename(f)
                      for f in self.skiplist.iterkeys())
        appended_recipes = self.collection.appendlist.iterkeys()
        appends_without_recipes = [self.collection.appendlist[recipe]
                                   for recipe in appended_recipes
                                   if recipe not in recipes]
        if appends_without_recipes:
            appendlines = ('  %s' % append
                           for appends in appends_without_recipes
                           for append in appends)
            msg = 'No recipes available for:\n%s' % '\n'.join(appendlines)
            warn_only = data.getVar("BB_DANGLINGAPPENDS_WARNONLY", \
                 self.data, False) or "no"
            if warn_only.lower() in ("1", "yes", "true"):
                bb.warn(msg)
            else:
                bb.fatal(msg)

    def handlePrefProviders(self):

        localdata = data.createCopy(self.data)
        bb.data.update_data(localdata)
        bb.data.expandKeys(localdata)

        # Handle PREFERRED_PROVIDERS
        for p in (localdata.getVar('PREFERRED_PROVIDERS', True) or "").split():
            try:
                (providee, provider) = p.split(':')
            except:
                providerlog.critical("Malformed option in PREFERRED_PROVIDERS variable: %s" % p)
                continue
            if providee in self.recipecache.preferred and self.recipecache.preferred[providee] != provider:
                providerlog.error("conflicting preferences for %s: both %s and %s specified", providee, provider, self.recipecache.preferred[providee])
            self.recipecache.preferred[providee] = provider

    def findCoreBaseFiles(self, subdir, configfile):
        corebase = self.data.getVar('COREBASE', True) or ""
        paths = []
        for root, dirs, files in os.walk(corebase + '/' + subdir):
            for d in dirs:
                configfilepath = os.path.join(root, d, configfile)
                if os.path.exists(configfilepath):
                    paths.append(os.path.join(root, d))

        if paths:
            bb.event.fire(bb.event.CoreBaseFilesFound(paths), self.data)

    def findConfigFilePath(self, configfile):
        """
        Find the location on disk of configfile and if it exists and was parsed by BitBake
        emit the ConfigFilePathFound event with the path to the file.
        """
        path = bb.cookerdata.findConfigFile(configfile, self.data)
        if not path:
            return

        # Generate a list of parsed configuration files by searching the files
        # listed in the __depends and __base_depends variables with a .conf suffix.
        conffiles = []
        dep_files = self.data.getVar('__base_depends') or []
        dep_files = dep_files + (self.data.getVar('__depends') or [])

        for f in dep_files:
            if f[0].endswith(".conf"):
                conffiles.append(f[0])

        _, conf, conffile = path.rpartition("conf/")
        match = os.path.join(conf, conffile)
        # Try and find matches for conf/conffilename.conf as we don't always
        # have the full path to the file.
        for cfg in conffiles:
            if cfg.endswith(match):
                bb.event.fire(bb.event.ConfigFilePathFound(path),
                              self.data)
                break

    def findFilesMatchingInDir(self, filepattern, directory):
        """
        Searches for files matching the regex 'pattern' which are children of
        'directory' in each BBPATH. i.e. to find all rootfs package classes available
        to BitBake one could call findFilesMatchingInDir(self, 'rootfs_', 'classes')
        or to find all machine configuration files one could call:
        findFilesMatchingInDir(self, 'conf/machines', 'conf')
        """
        import re

        matches = []
        p = re.compile(re.escape(filepattern))
        bbpaths = self.data.getVar('BBPATH', True).split(':')
        for path in bbpaths:
            dirpath = os.path.join(path, directory)
            if os.path.exists(dirpath):
                for root, dirs, files in os.walk(dirpath):
                    for f in files:
                        if p.search(f):
                            matches.append(f)

        if matches:
            bb.event.fire(bb.event.FilesMatchingFound(filepattern, matches), self.data)

    def findConfigFiles(self, varname):
        """
        Find config files which are appropriate values for varname.
        i.e. MACHINE, DISTRO
        """
        possible = []
        var = varname.lower()

        data = self.data
        # iterate configs
        bbpaths = data.getVar('BBPATH', True).split(':')
        for path in bbpaths:
            confpath = os.path.join(path, "conf", var)
            if os.path.exists(confpath):
                for root, dirs, files in os.walk(confpath):
                    # get all child files, these are appropriate values
                    for f in files:
                        val, sep, end = f.rpartition('.')
                        if end == 'conf':
                            possible.append(val)

        if possible:
            bb.event.fire(bb.event.ConfigFilesFound(var, possible), self.data)

    def findInheritsClass(self, klass):
        """
        Find all recipes which inherit the specified class
        """
        pkg_list = []

        for pfn in self.recipecache.pkg_fn:
            inherits = self.recipecache.inherits.get(pfn, None)
            if inherits and inherits.count(klass) > 0:
                pkg_list.append(self.recipecache.pkg_fn[pfn])

        return pkg_list

    def generateTargetsTree(self, klass=None, pkgs=[]):
        """
        Generate a dependency tree of buildable targets
        Generate an event with the result
        """
        # if the caller hasn't specified a pkgs list default to universe
        if not len(pkgs):
            pkgs = ['universe']
        # if inherited_class passed ensure all recipes which inherit the
        # specified class are included in pkgs
        if klass:
            extra_pkgs = self.findInheritsClass(klass)
            pkgs = pkgs + extra_pkgs

        # generate a dependency tree for all our packages
        tree = self.generatePkgDepTreeData(pkgs, 'build')
        bb.event.fire(bb.event.TargetsTreeGenerated(tree), self.data)

    def buildWorldTargetList(self):
        """
         Build package list for "bitbake world"
        """
        parselog.debug(1, "collating packages for \"world\"")
        for f in self.recipecache.possible_world:
            terminal = True
            pn = self.recipecache.pkg_fn[f]

            for p in self.recipecache.pn_provides[pn]:
                if p.startswith('virtual/'):
                    parselog.debug(2, "World build skipping %s due to %s provider starting with virtual/", f, p)
                    terminal = False
                    break
                for pf in self.recipecache.providers[p]:
                    if self.recipecache.pkg_fn[pf] != pn:
                        parselog.debug(2, "World build skipping %s due to both us and %s providing %s", f, pf, p)
                        terminal = False
                        break
            if terminal:
                self.recipecache.world_target.add(pn)

    def interactiveMode( self ):
        """Drop off into a shell"""
        try:
            from bb import shell
        except ImportError:
            parselog.exception("Interactive mode not available")
            sys.exit(1)
        else:
            shell.start( self )


    def handleCollections( self, collections ):
        """Handle collections"""
        errors = False
        self.recipecache.bbfile_config_priorities = []
        if collections:
            collection_priorities = {}
            collection_depends = {}
            collection_list = collections.split()
            min_prio = 0
            for c in collection_list:
                # Get collection priority if defined explicitly
                priority = self.data.getVar("BBFILE_PRIORITY_%s" % c, True)
                if priority:
                    try:
                        prio = int(priority)
                    except ValueError:
                        parselog.error("invalid value for BBFILE_PRIORITY_%s: \"%s\"", c, priority)
                        errors = True
                    if min_prio == 0 or prio < min_prio:
                        min_prio = prio
                    collection_priorities[c] = prio
                else:
                    collection_priorities[c] = None

                # Check dependencies and store information for priority calculation
                deps = self.data.getVar("LAYERDEPENDS_%s" % c, True)
                if deps:
                    depnamelist = []
                    deplist = deps.split()
                    for dep in deplist:
                        depsplit = dep.split(':')
                        if len(depsplit) > 1:
                            try:
                                depver = int(depsplit[1])
                            except ValueError:
                                parselog.error("invalid version value in LAYERDEPENDS_%s: \"%s\"", c, dep)
                                errors = True
                                continue
                        else:
                            depver = None
                        dep = depsplit[0]
                        depnamelist.append(dep)

                        if dep in collection_list:
                            if depver:
                                layerver = self.data.getVar("LAYERVERSION_%s" % dep, True)
                                if layerver:
                                    try:
                                        lver = int(layerver)
                                    except ValueError:
                                        parselog.error("invalid value for LAYERVERSION_%s: \"%s\"", c, layerver)
                                        errors = True
                                        continue
                                    if lver != depver:
                                        parselog.error("Layer '%s' depends on version %d of layer '%s', but version %d is enabled in your configuration", c, depver, dep, lver)
                                        errors = True
                                else:
                                    parselog.error("Layer '%s' depends on version %d of layer '%s', which exists in your configuration but does not specify a version", c, depver, dep)
                                    errors = True
                        else:
                            parselog.error("Layer '%s' depends on layer '%s', but this layer is not enabled in your configuration", c, dep)
                            errors = True
                    collection_depends[c] = depnamelist
                else:
                    collection_depends[c] = []

            # Recursively work out collection priorities based on dependencies
            def calc_layer_priority(collection):
                if not collection_priorities[collection]:
                    max_depprio = min_prio
                    for dep in collection_depends[collection]:
                        calc_layer_priority(dep)
                        depprio = collection_priorities[dep]
                        if depprio > max_depprio:
                            max_depprio = depprio
                    max_depprio += 1
                    parselog.debug(1, "Calculated priority of layer %s as %d", collection, max_depprio)
                    collection_priorities[collection] = max_depprio

            # Calculate all layer priorities using calc_layer_priority and store in bbfile_config_priorities
            for c in collection_list:
                calc_layer_priority(c)
                regex = self.data.getVar("BBFILE_PATTERN_%s" % c, True)
                if regex == None:
                    parselog.error("BBFILE_PATTERN_%s not defined" % c)
                    errors = True
                    continue
                try:
                    cre = re.compile(regex)
                except re.error:
                    parselog.error("BBFILE_PATTERN_%s \"%s\" is not a valid regular expression", c, regex)
                    errors = True
                    continue
                self.recipecache.bbfile_config_priorities.append((c, regex, cre, collection_priorities[c]))
        if errors:
            # We've already printed the actual error(s)
            raise CollectionError("Errors during parsing layer configuration")

    def buildSetVars(self):
        """
        Setup any variables needed before starting a build
        """
        if not self.data.getVar("BUILDNAME"):
            self.data.setVar("BUILDNAME", time.strftime('%Y%m%d%H%M'))
        self.data.setVar("BUILDSTART", time.strftime('%m/%d/%Y %H:%M:%S', time.gmtime()))

    def matchFiles(self, bf):
        """
        Find the .bb files which match the expression in 'buildfile'.
        """
        if bf.startswith("/") or bf.startswith("../"):
            bf = os.path.abspath(bf)

        self.collection = CookerCollectFiles(self.recipecache.bbfile_config_priorities)
        filelist, masked = self.collection.collect_bbfiles(self.data, self.event_data)
        try:
            os.stat(bf)
            bf = os.path.abspath(bf)
            return [bf]
        except OSError:
            regexp = re.compile(bf)
            matches = []
            for f in filelist:
                if regexp.search(f) and os.path.isfile(f):
                    matches.append(f)
            return matches

    def matchFile(self, buildfile):
        """
        Find the .bb file which matches the expression in 'buildfile'.
        Raise an error if multiple files
        """
        matches = self.matchFiles(buildfile)
        if len(matches) != 1:
            if matches:
                msg = "Unable to match '%s' to a specific recipe file - %s matches found:" % (buildfile, len(matches))
                if matches:
                    for f in matches:
                        msg += "\n    %s" % f
                parselog.error(msg)
            else:
                parselog.error("Unable to find any recipe file matching '%s'" % buildfile)
            raise NoSpecificMatch
        return matches[0]

    def buildFile(self, buildfile, task):
        """
        Build the file matching regexp buildfile
        """

        # Too many people use -b because they think it's how you normally
        # specify a target to be built, so show a warning
        bb.warn("Buildfile specified, dependencies will not be handled. If this is not what you want, do not use -b / --buildfile.")

        # Parse the configuration here. We need to do it explicitly here since
        # buildFile() doesn't use the cache
        self.parseConfiguration()

        # If we are told to do the None task then query the default task
        if (task == None):
            task = self.configuration.cmd

        fn, cls = bb.cache.Cache.virtualfn2realfn(buildfile)
        fn = self.matchFile(fn)

        self.buildSetVars()

        self.recipecache = bb.cache.CacheData(self.caches_array)
        infos = bb.cache.Cache.parse(fn, self.collection.get_file_appends(fn), \
                                     self.data,
                                     self.caches_array)
        infos = dict(infos)

        fn = bb.cache.Cache.realfn2virtual(fn, cls)
        try:
            info_array = infos[fn]
        except KeyError:
            bb.fatal("%s does not exist" % fn)

        if info_array[0].skipped:
            bb.fatal("%s was skipped: %s" % (fn, info_array[0].skipreason))

        self.recipecache.add_from_recipeinfo(fn, info_array)

        # Tweak some variables
        item = info_array[0].pn
        self.recipecache.ignored_dependencies = set()
        self.recipecache.bbfile_priority[fn] = 1

        # Remove external dependencies
        self.recipecache.task_deps[fn]['depends'] = {}
        self.recipecache.deps[fn] = []
        self.recipecache.rundeps[fn] = []
        self.recipecache.runrecs[fn] = []

        # Invalidate task for target if force mode active
        if self.configuration.force:
            logger.verbose("Invalidate task %s, %s", task, fn)
            bb.parse.siggen.invalidate_task('do_%s' % task, self.recipecache, fn)

        # Setup taskdata structure
        taskdata = bb.taskdata.TaskData(self.configuration.abort)
        taskdata.add_provider(self.data, self.recipecache, item)

        buildname = self.data.getVar("BUILDNAME")
        bb.event.fire(bb.event.BuildStarted(buildname, [item]), self.event_data)

        # Execute the runqueue
        runlist = [[item, "do_%s" % task]]

        rq = bb.runqueue.RunQueue(self, self.data, self.recipecache, taskdata, runlist)

        def buildFileIdle(server, rq, abort):

            if abort or self.state == state.forceshutdown:
                rq.finish_runqueue(True)
            elif self.state == state.shutdown:
                rq.finish_runqueue(False)
            failures = 0
            try:
                retval = rq.execute_runqueue()
            except runqueue.TaskFailure as exc:
                failures += len(exc.args)
                retval = False
            except SystemExit as exc:
                self.command.finishAsyncCommand()
                return False

            if not retval:
                bb.event.fire(bb.event.BuildCompleted(len(rq.rqdata.runq_fnid), buildname, item, failures), self.event_data)
                self.command.finishAsyncCommand()
                return False
            if retval is True:
                return True
            return retval

        self.configuration.server_register_idlecallback(buildFileIdle, rq)

    def buildTargets(self, targets, task):
        """
        Attempt to build the targets specified
        """

        def buildTargetsIdle(server, rq, abort):
            if abort or self.state == state.forceshutdown:
                rq.finish_runqueue(True)
            elif self.state == state.shutdown:
                rq.finish_runqueue(False)
            failures = 0
            try:
                retval = rq.execute_runqueue()
            except runqueue.TaskFailure as exc:
                failures += len(exc.args)
                retval = False
            except SystemExit as exc:
                self.command.finishAsyncCommand()
                return False

            if not retval:
                bb.event.fire(bb.event.BuildCompleted(len(rq.rqdata.runq_fnid), buildname, targets, failures), self.data)
                self.command.finishAsyncCommand()
                return False
            if retval is True:
                return True
            return retval

        self.buildSetVars()

        taskdata, runlist, fulltargetlist = self.buildTaskData(targets, task, self.configuration.abort)

        buildname = self.data.getVar("BUILDNAME")
        bb.event.fire(bb.event.BuildStarted(buildname, fulltargetlist), self.data)

        rq = bb.runqueue.RunQueue(self, self.data, self.recipecache, taskdata, runlist)
        if 'universe' in targets:
            rq.rqdata.warn_multi_bb = True

        self.configuration.server_register_idlecallback(buildTargetsIdle, rq)


    def getAllKeysWithFlags(self, flaglist):
        dump = {}
        for k in self.data.keys():
            try:
                v = self.data.getVar(k, True)
                if not k.startswith("__") and not isinstance(v, bb.data_smart.DataSmart):
                    dump[k] = { 'v' : v }
                    for d in flaglist:
                        dump[k][d] = self.data.getVarFlag(k, d)
            except Exception as e:
                print(e)
        return dump


    def generateNewImage(self, image, base_image, package_queue, timestamp, description):
        '''
        Create a new image with a "require"/"inherit" base_image statement
        '''
        if timestamp:
            image_name = os.path.splitext(image)[0]
            timestr = time.strftime("-%Y%m%d-%H%M%S")
            dest = image_name + str(timestr) + ".bb"
        else:
            if not image.endswith(".bb"):
                dest = image + ".bb"
            else:
                dest = image

        if base_image:
            with open(base_image, 'r') as f:
                require_line = f.readline()

        with open(dest, "w") as imagefile:
            if base_image is None:
                imagefile.write("inherit image\n")
            else:
                topdir = self.data.getVar("TOPDIR")
                if topdir in base_image:
                    base_image = require_line.split()[1]
                imagefile.write("require " + base_image + "\n")
            image_install = "IMAGE_INSTALL = \""
            for package in package_queue:
                image_install += str(package) + " "
            image_install += "\"\n"
            imagefile.write(image_install)

            description_var = "DESCRIPTION = \"" + description + "\"\n"
            imagefile.write(description_var)

        self.state = state.initial
        if timestamp:
            return timestr

    # This is called for all async commands when self.state != running
    def updateCache(self):
        if self.state == state.running:
            return

        if self.state in (state.shutdown, state.forceshutdown):
            self.parser.shutdown(clean=False, force = True)
            raise bb.BBHandledException()

        if self.state != state.parsing:
            self.parseConfiguration ()

            ignore = self.data.getVar("ASSUME_PROVIDED", True) or ""
            self.recipecache.ignored_dependencies = set(ignore.split())

            for dep in self.configuration.extra_assume_provided:
                self.recipecache.ignored_dependencies.add(dep)

            self.collection = CookerCollectFiles(self.recipecache.bbfile_config_priorities)
            (filelist, masked) = self.collection.collect_bbfiles(self.data, self.event_data)

            self.data.renameVar("__depends", "__base_depends")

            self.parser = CookerParser(self, filelist, masked)
            self.state = state.parsing

        if not self.parser.parse_next():
            collectlog.debug(1, "parsing complete")
            if self.parser.error:
                raise bb.BBHandledException()
            self.show_appends_with_no_recipes()
            self.handlePrefProviders()
            self.recipecache.bbfile_priority = self.collection.collection_priorities(self.recipecache.pkg_fn)
            self.state = state.running
            return None

        return True

    def checkPackages(self, pkgs_to_build):

        # Return a copy, don't modify the original
        pkgs_to_build = pkgs_to_build[:]

        if len(pkgs_to_build) == 0:
            raise NothingToBuild

        if 'world' in pkgs_to_build:
            self.buildWorldTargetList()
            pkgs_to_build.remove('world')
            for t in self.recipecache.world_target:
                pkgs_to_build.append(t)

        if 'universe' in pkgs_to_build:
            parselog.warn("The \"universe\" target is only intended for testing and may produce errors.")
            parselog.debug(1, "collating packages for \"universe\"")
            pkgs_to_build.remove('universe')
            for t in self.recipecache.universe_target:
                pkgs_to_build.append(t)

        return pkgs_to_build




    def pre_serve(self):
        # Empty the environment. The environment will be populated as
        # necessary from the data store.
        #bb.utils.empty_environment()
        try:
            self.prhost = prserv.serv.auto_start(self.data)
        except prserv.serv.PRServiceConfigError:
            bb.event.fire(CookerExit(), self.event_data)
        return

    def post_serve(self):
        prserv.serv.auto_shutdown(self.data)
        bb.event.fire(CookerExit(), self.event_data)

    def shutdown(self, force = False):
        if force:
            self.state = state.forceshutdown
        else:
            self.state = state.shutdown

    def finishcommand(self):
        self.state = state.initial

    def initialize(self):
        self.initConfigurationData()

    def reset(self):
        self.loadConfigurationData()

def server_main(cooker, func, *args):
    cooker.pre_serve()

    if cooker.configuration.profile:
        try:
            import cProfile as profile
        except:
            import profile
        prof = profile.Profile()

        ret = profile.Profile.runcall(prof, func, *args)

        prof.dump_stats("profile.log")
        bb.utils.process_profilelog("profile.log")
        print("Raw profiling information saved to profile.log and processed statistics to profile.log.processed")

    else:
        ret = func(*args)

    cooker.post_serve()

    return ret

class CookerExit(bb.event.Event):
    """
    Notify clients of the Cooker shutdown
    """

    def __init__(self):
        bb.event.Event.__init__(self)


class CookerCollectFiles(object):
    def __init__(self, priorities):
        self.appendlist = {}
        self.bbfile_config_priorities = priorities

    def calc_bbfile_priority( self, filename, matched = None ):
        for _, _, regex, pri in self.bbfile_config_priorities:
            if regex.match(filename):
                if matched != None:
                    if not regex in matched:
                        matched.add(regex)
                return pri
        return 0

    def get_bbfiles(self):
        """Get list of default .bb files by reading out the current directory"""
        path = os.getcwd()
        contents = os.listdir(path)
        bbfiles = []
        for f in contents:
            if f.endswith(".bb"):
                bbfiles.append(os.path.abspath(os.path.join(path, f)))
        return bbfiles

    def find_bbfiles(self, path):
        """Find all the .bb and .bbappend files in a directory"""
        found = []
        for dir, dirs, files in os.walk(path):
            for ignored in ('SCCS', 'CVS', '.svn'):
                if ignored in dirs:
                    dirs.remove(ignored)
            found += [os.path.join(dir, f) for f in files if (f.endswith('.bb') or f.endswith('.bbappend'))]

        return found

    def collect_bbfiles(self, config, eventdata):
        """Collect all available .bb build files"""
        masked = 0

        collectlog.debug(1, "collecting .bb files")

        files = (config.getVar( "BBFILES", True) or "").split()
        config.setVar("BBFILES", " ".join(files))

        # Sort files by priority
        files.sort( key=lambda fileitem: self.calc_bbfile_priority(fileitem) )

        if not len(files):
            files = self.get_bbfiles()

        if not len(files):
            collectlog.error("no recipe files to build, check your BBPATH and BBFILES?")
            bb.event.fire(CookerExit(), eventdata)

        # Can't use set here as order is important
        newfiles = []
        for f in files:
            if os.path.isdir(f):
                dirfiles = self.find_bbfiles(f)
                for g in dirfiles:
                    if g not in newfiles:
                        newfiles.append(g)
            else:
                globbed = glob.glob(f)
                if not globbed and os.path.exists(f):
                    globbed = [f]
                for g in globbed:
                    if g not in newfiles:
                        newfiles.append(g)

        bbmask = config.getVar('BBMASK', True)

        if bbmask:
            try:
                bbmask_compiled = re.compile(bbmask)
            except sre_constants.error:
                collectlog.critical("BBMASK is not a valid regular expression, ignoring.")
                return list(newfiles), 0

        bbfiles = []
        bbappend = []
        for f in newfiles:
            if bbmask and bbmask_compiled.search(f):
                collectlog.debug(1, "skipping masked file %s", f)
                masked += 1
                continue
            if f.endswith('.bb'):
                bbfiles.append(f)
            elif f.endswith('.bbappend'):
                bbappend.append(f)
            else:
                collectlog.debug(1, "skipping %s: unknown file extension", f)

        # Build a list of .bbappend files for each .bb file
        for f in bbappend:
            base = os.path.basename(f).replace('.bbappend', '.bb')
            if not base in self.appendlist:
               self.appendlist[base] = []
            if f not in self.appendlist[base]:
                self.appendlist[base].append(f)

        # Find overlayed recipes
        # bbfiles will be in priority order which makes this easy
        bbfile_seen = dict()
        self.overlayed = defaultdict(list)
        for f in reversed(bbfiles):
            base = os.path.basename(f)
            if base not in bbfile_seen:
                bbfile_seen[base] = f
            else:
                topfile = bbfile_seen[base]
                self.overlayed[topfile].append(f)

        return (bbfiles, masked)

    def get_file_appends(self, fn):
        """
        Returns a list of .bbappend files to apply to fn
        """
        f = os.path.basename(fn)
        if f in self.appendlist:
            return self.appendlist[f]
        return []

    def collection_priorities(self, pkgfns):

        priorities = {}

        # Calculate priorities for each file
        matched = set()
        for p in pkgfns:
            realfn, cls = bb.cache.Cache.virtualfn2realfn(p)
            priorities[p] = self.calc_bbfile_priority(realfn, matched)
 
        # Don't show the warning if the BBFILE_PATTERN did match .bbappend files
        unmatched = set()
        for _, _, regex, pri in self.bbfile_config_priorities:        
            if not regex in matched:
                unmatched.add(regex)

        def findmatch(regex):
            for bbfile in self.appendlist:
                for append in self.appendlist[bbfile]:
                    if regex.match(append):
                        return True
            return False

        for unmatch in unmatched.copy():
            if findmatch(unmatch):
                unmatched.remove(unmatch)

        for collection, pattern, regex, _ in self.bbfile_config_priorities:
            if regex in unmatched:
                collectlog.warn("No bb files matched BBFILE_PATTERN_%s '%s'" % (collection, pattern))

        return priorities

class ParsingFailure(Exception):
    def __init__(self, realexception, recipe):
        self.realexception = realexception
        self.recipe = recipe
        Exception.__init__(self, realexception, recipe)

class Feeder(multiprocessing.Process):
    def __init__(self, jobs, to_parsers, quit):
        self.quit = quit
        self.jobs = jobs
        self.to_parsers = to_parsers
        multiprocessing.Process.__init__(self)

    def run(self):
        while True:
            try:
                quit = self.quit.get_nowait()
            except Queue.Empty:
                pass
            else:
                if quit == 'cancel':
                    self.to_parsers.cancel_join_thread()
                break

            try:
                job = self.jobs.pop()
            except IndexError:
                break

            try:
                self.to_parsers.put(job, timeout=0.5)
            except Queue.Full:
                self.jobs.insert(0, job)
                continue

class Parser(multiprocessing.Process):
    def __init__(self, jobs, results, quit, init, profile):
        self.jobs = jobs
        self.results = results
        self.quit = quit
        self.init = init
        multiprocessing.Process.__init__(self)
        self.context = bb.utils.get_context().copy()
        self.handlers = bb.event.get_class_handlers().copy()
        self.profile = profile

    def run(self):

        if not self.profile:
            self.realrun()
            return

        try:
            import cProfile as profile
        except:
            import profile
        prof = profile.Profile()
        try:
            profile.Profile.runcall(prof, self.realrun)
        finally:
            logfile = "profile-parse-%s.log" % multiprocessing.current_process().name
            prof.dump_stats(logfile)
            bb.utils.process_profilelog(logfile)
            print("Raw profiling information saved to %s and processed statistics to %s.processed" % (logfile, logfile))

    def realrun(self):
        if self.init:
            self.init()

        pending = []
        while True:
            try:
                self.quit.get_nowait()
            except Queue.Empty:
                pass
            else:
                self.results.cancel_join_thread()
                break

            if pending:
                result = pending.pop()
            else:
                try:
                    job = self.jobs.get(timeout=0.25)
                except Queue.Empty:
                    continue

                if job is None:
                    break
                result = self.parse(*job)

            try:
                self.results.put(result, timeout=0.25)
            except Queue.Full:
                pending.append(result)

    def parse(self, filename, appends, caches_array):
        try:
            # Reset our environment and handlers to the original settings
            bb.utils.set_context(self.context.copy())
            bb.event.set_class_handlers(self.handlers.copy())
            return True, bb.cache.Cache.parse(filename, appends, self.cfg, caches_array)
        except Exception as exc:
            tb = sys.exc_info()[2]
            exc.recipe = filename
            exc.traceback = list(bb.exceptions.extract_traceback(tb, context=3))
            return True, exc
        # Need to turn BaseExceptions into Exceptions here so we gracefully shutdown
        # and for example a worker thread doesn't just exit on its own in response to
        # a SystemExit event for example.
        except BaseException as exc:
            return True, ParsingFailure(exc, filename)

class CookerParser(object):
    def __init__(self, cooker, filelist, masked):
        self.filelist = filelist
        self.cooker = cooker
        self.cfgdata = cooker.data
        self.cfghash = cooker.data_hash

        # Accounting statistics
        self.parsed = 0
        self.cached = 0
        self.error = 0
        self.masked = masked

        self.skipped = 0
        self.virtuals = 0
        self.total = len(filelist)

        self.current = 0
        self.num_processes = int(self.cfgdata.getVar("BB_NUMBER_PARSE_THREADS", True) or
                                 multiprocessing.cpu_count())

        self.bb_cache = bb.cache.Cache(self.cfgdata, self.cfghash, cooker.caches_array)
        self.fromcache = []
        self.willparse = []
        for filename in self.filelist:
            appends = self.cooker.collection.get_file_appends(filename)
            if not self.bb_cache.cacheValid(filename, appends):
                self.willparse.append((filename, appends, cooker.caches_array))
            else:
                self.fromcache.append((filename, appends))
        self.toparse = self.total - len(self.fromcache)
        self.progress_chunk = max(self.toparse / 100, 1)

        self.start()
        self.haveshutdown = False

    def start(self):
        self.results = self.load_cached()
        self.processes = []
        if self.toparse:
            bb.event.fire(bb.event.ParseStarted(self.toparse), self.cfgdata)
            def init():
                Parser.cfg = self.cfgdata
                multiprocessing.util.Finalize(None, bb.codeparser.parser_cache_save, args=(self.cfgdata,), exitpriority=1)
                multiprocessing.util.Finalize(None, bb.fetch.fetcher_parse_save, args=(self.cfgdata,), exitpriority=1)

            self.feeder_quit = multiprocessing.Queue(maxsize=1)
            self.parser_quit = multiprocessing.Queue(maxsize=self.num_processes)
            self.jobs = multiprocessing.Queue(maxsize=self.num_processes)
            self.result_queue = multiprocessing.Queue()
            self.feeder = Feeder(self.willparse, self.jobs, self.feeder_quit)
            self.feeder.start()
            for i in range(0, self.num_processes):
                parser = Parser(self.jobs, self.result_queue, self.parser_quit, init, self.cooker.configuration.profile)
                parser.start()
                self.processes.append(parser)

            self.results = itertools.chain(self.results, self.parse_generator())

    def shutdown(self, clean=True, force=False):
        if not self.toparse:
            return
        if self.haveshutdown:
            return
        self.haveshutdown = True

        if clean:
            event = bb.event.ParseCompleted(self.cached, self.parsed,
                                            self.skipped, self.masked,
                                            self.virtuals, self.error,
                                            self.total)

            bb.event.fire(event, self.cfgdata)
            self.feeder_quit.put(None)
            for process in self.processes:
                self.jobs.put(None)
        else:
            self.feeder_quit.put('cancel')

            self.parser_quit.cancel_join_thread()
            for process in self.processes:
                self.parser_quit.put(None)

            self.jobs.cancel_join_thread()

        for process in self.processes:
            if force:
                process.join(.1)
                process.terminate()
            else:
                process.join()
        self.feeder.join()

        sync = threading.Thread(target=self.bb_cache.sync)
        sync.start()
        multiprocessing.util.Finalize(None, sync.join, exitpriority=-100)
        bb.codeparser.parser_cache_savemerge(self.cooker.data)
        bb.fetch.fetcher_parse_done(self.cooker.data)

    def load_cached(self):
        for filename, appends in self.fromcache:
            cached, infos = self.bb_cache.load(filename, appends, self.cfgdata)
            yield not cached, infos

    def parse_generator(self):
        while True:
            if self.parsed >= self.toparse:
                break

            try:
                result = self.result_queue.get(timeout=0.25)
            except Queue.Empty:
                pass
            else:
                value = result[1]
                if isinstance(value, BaseException):
                    raise value
                else:
                    yield result

    def parse_next(self):
        result = []
        parsed = None
        try:
            parsed, result = self.results.next()
        except StopIteration:
            self.shutdown()
            return False
        except bb.BBHandledException as exc:
            self.error += 1
            logger.error('Failed to parse recipe: %s' % exc.recipe)
            self.shutdown(clean=False)
            return False
        except ParsingFailure as exc:
            self.error += 1
            logger.error('Unable to parse %s: %s' %
                     (exc.recipe, bb.exceptions.to_string(exc.realexception)))
            self.shutdown(clean=False)
            return False
        except bb.parse.ParseError as exc:
            self.error += 1
            logger.error(str(exc))
            self.shutdown(clean=False)
            return False
        except bb.data_smart.ExpansionError as exc:
            self.error += 1
            _, value, _ = sys.exc_info()
            logger.error('ExpansionError during parsing %s: %s', value.recipe, str(exc))
            self.shutdown(clean=False)
            return False
        except SyntaxError as exc:
            self.error += 1
            logger.error('Unable to parse %s', exc.recipe)
            self.shutdown(clean=False)
            return False
        except Exception as exc:
            self.error += 1
            etype, value, tb = sys.exc_info()
            if hasattr(value, "recipe"):
                logger.error('Unable to parse %s', value.recipe,
                            exc_info=(etype, value, exc.traceback))
            else:
                # Most likely, an exception occurred during raising an exception
                import traceback
                logger.error('Exception during parse: %s' % traceback.format_exc())
            self.shutdown(clean=False)
            return False

        self.current += 1
        self.virtuals += len(result)
        if parsed:
            self.parsed += 1
            if self.parsed % self.progress_chunk == 0:
                bb.event.fire(bb.event.ParseProgress(self.parsed, self.toparse),
                              self.cfgdata)
        else:
            self.cached += 1

        for virtualfn, info_array in result:
            if info_array[0].skipped:
                self.skipped += 1
                self.cooker.skiplist[virtualfn] = SkippedPackage(info_array[0])
            self.bb_cache.add_info(virtualfn, info_array, self.cooker.recipecache,
                                        parsed=parsed)
        return True

    def reparse(self, filename):
        infos = self.bb_cache.parse(filename,
                                    self.cooker.collection.get_file_appends(filename),
                                    self.cfgdata, self.cooker.caches_array)
        for vfn, info_array in infos:
            self.cooker.recipecache.add_from_recipeinfo(vfn, info_array)