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# portage.py -- core Portage functionality
# Copyright 1998-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$


VERSION="$Rev$"[6:-2] + "-svn"

# ===========================================================================
# START OF IMPORTS -- START OF IMPORTS -- START OF IMPORTS -- START OF IMPORT
# ===========================================================================

try:
	import sys
except ImportError:
	print "Failed to import sys! Something is _VERY_ wrong with python."
	raise

try:
	import copy, errno, os, re, shutil, time, types
	try:
		import cPickle
	except ImportError:
		import pickle as cPickle

	import stat
	import commands
	from time import sleep
	from random import shuffle
	import UserDict
	if getattr(__builtins__, "set", None) is None:
		from sets import Set as set
	from itertools import chain, izip
except ImportError, e:
	sys.stderr.write("\n\n")
	sys.stderr.write("!!! Failed to complete python imports. These are internal modules for\n")
	sys.stderr.write("!!! python and failure here indicates that you have a problem with python\n")
	sys.stderr.write("!!! itself and thus portage is not able to continue processing.\n\n")

	sys.stderr.write("!!! You might consider starting python with verbose flags to see what has\n")
	sys.stderr.write("!!! gone wrong. Here is the information we got for this exception:\n")
	sys.stderr.write("    "+str(e)+"\n\n");
	raise

try:
	# XXX: This should get renamed to bsd_chflags, I think.
	import chflags
	bsd_chflags = chflags
except ImportError:
	bsd_chflags = None

try:
	from cache.cache_errors import CacheError
	import cvstree
	import xpak
	import getbinpkg
	import portage_dep
	from portage_dep import dep_getcpv, dep_getkey, get_operator, \
		isjustname, isspecific, isvalidatom, \
		match_from_list, match_to_list, best_match_to_list

	# XXX: This needs to get cleaned up.
	import output
	from output import bold, colorize, green, red, yellow

	import portage_const
	from portage_const import VDB_PATH, PRIVATE_PATH, CACHE_PATH, DEPCACHE_PATH, \
	  USER_CONFIG_PATH, MODULES_FILE_PATH, CUSTOM_PROFILE_PATH, PORTAGE_BASE_PATH, \
	  PORTAGE_BIN_PATH, PORTAGE_PYM_PATH, PROFILE_PATH, LOCALE_DATA_PATH, \
	  EBUILD_SH_BINARY, SANDBOX_BINARY, BASH_BINARY, \
	  MOVE_BINARY, PRELINK_BINARY, WORLD_FILE, MAKE_CONF_FILE, MAKE_DEFAULTS_FILE, \
	  DEPRECATED_PROFILE_FILE, USER_VIRTUALS_FILE, EBUILD_SH_ENV_FILE, \
	  INVALID_ENV_FILE, CUSTOM_MIRRORS_FILE, CONFIG_MEMORY_FILE,\
	  INCREMENTALS, EAPI, MISC_SH_BINARY

	from portage_data import ostype, lchown, userland, secpass, uid, wheelgid, \
	                         portage_uid, portage_gid, userpriv_groups
	from portage_manifest import Manifest

	import portage_util
	from portage_util import atomic_ofstream, apply_secpass_permissions, apply_recursive_permissions, \
		dump_traceback, getconfig, grabdict, grabdict_package, grabfile, grabfile_package, \
		map_dictlist_vals, new_protect_filename, normalize_path, \
		pickle_read, pickle_write, stack_dictlist, stack_dicts, stack_lists, \
		unique_array, varexpand, writedict, writemsg, writemsg_stdout, write_atomic
	import portage_exception
	import portage_gpg
	import portage_locks
	import portage_exec
	from portage_exec import atexit_register, run_exitfuncs
	from portage_locks import unlockfile,unlockdir,lockfile,lockdir
	import portage_checksum
	from portage_checksum import perform_md5,perform_checksum,prelink_capable
	import eclass_cache
	from portage_localization import _
	from portage_update import dep_transform, fixdbentries, grab_updates, \
		parse_updates, update_config_files, update_dbentries

	# Need these functions directly in portage namespace to not break every external tool in existence
	from portage_versions import best, catpkgsplit, catsplit, pkgcmp, \
		pkgsplit, vercmp, ververify

	# endversion and endversion_keys are for backward compatibility only.
	from portage_versions import endversion_keys
	from portage_versions import suffix_value as endversion

except ImportError, e:
	sys.stderr.write("\n\n")
	sys.stderr.write("!!! Failed to complete portage imports. There are internal modules for\n")
	sys.stderr.write("!!! portage and failure here indicates that you have a problem with your\n")
	sys.stderr.write("!!! installation of portage. Please try a rescue portage located in the\n")
	sys.stderr.write("!!! portage tree under '/usr/portage/sys-apps/portage/files/' (default).\n")
	sys.stderr.write("!!! There is a README.RESCUE file that details the steps required to perform\n")
	sys.stderr.write("!!! a recovery of portage.\n")
	sys.stderr.write("    "+str(e)+"\n\n")
	raise


try:
	import portage_selinux as selinux
except OSError, e:
	writemsg("!!! SELinux not loaded: %s\n" % str(e), noiselevel=-1)
	del e
except ImportError:
	pass

# ===========================================================================
# END OF IMPORTS -- END OF IMPORTS -- END OF IMPORTS -- END OF IMPORTS -- END
# ===========================================================================


def load_mod(name):
	modname = ".".join(name.split(".")[:-1])
	mod = __import__(modname)
	components = name.split('.')
	for comp in components[1:]:
		mod = getattr(mod, comp)
	return mod

def best_from_dict(key, top_dict, key_order, EmptyOnError=1, FullCopy=1, AllowEmpty=1):
	for x in key_order:
		if top_dict.has_key(x) and top_dict[x].has_key(key):
			if FullCopy:
				return copy.deepcopy(top_dict[x][key])
			else:
				return top_dict[x][key]
	if EmptyOnError:
		return ""
	else:
		raise KeyError, "Key not found in list; '%s'" % key

def getcwd():
	"this fixes situations where the current directory doesn't exist"
	try:
		return os.getcwd()
	except OSError: #dir doesn't exist
		os.chdir("/")
		return "/"
getcwd()

def abssymlink(symlink):
	"This reads symlinks, resolving the relative symlinks, and returning the absolute."
	mylink=os.readlink(symlink)
	if mylink[0] != '/':
		mydir=os.path.dirname(symlink)
		mylink=mydir+"/"+mylink
	return os.path.normpath(mylink)

dircache = {}
cacheHit=0
cacheMiss=0
cacheStale=0
def cacheddir(my_original_path, ignorecvs, ignorelist, EmptyOnError, followSymlinks=True):
	global cacheHit,cacheMiss,cacheStale
	mypath = normalize_path(my_original_path)
	if dircache.has_key(mypath):
		cacheHit += 1
		cached_mtime, list, ftype = dircache[mypath]
	else:
		cacheMiss += 1
		cached_mtime, list, ftype = -1, [], []
	try:
		pathstat = os.stat(mypath)
		if stat.S_ISDIR(pathstat[stat.ST_MODE]):
			mtime = pathstat[stat.ST_MTIME]
		else:
			raise portage_exception.DirectoryNotFound(mypath)
	except (IOError,OSError,portage_exception.PortageException):
		if EmptyOnError:
			return [], []
		return None, None
	# Python retuns mtime in seconds, so if it was changed in the last few seconds, it could be invalid
	if mtime != cached_mtime or time.time() - mtime < 4:
		if dircache.has_key(mypath):
			cacheStale += 1
		list = os.listdir(mypath)
		ftype = []
		for x in list:
			try:
				if followSymlinks:
					pathstat = os.stat(mypath+"/"+x)
				else:
					pathstat = os.lstat(mypath+"/"+x)

				if stat.S_ISREG(pathstat[stat.ST_MODE]):
					ftype.append(0)
				elif stat.S_ISDIR(pathstat[stat.ST_MODE]):
					ftype.append(1)
				elif stat.S_ISLNK(pathstat[stat.ST_MODE]):
					ftype.append(2)
				else:
					ftype.append(3)
			except (IOError, OSError):
				ftype.append(3)
		dircache[mypath] = mtime, list, ftype

	ret_list = []
	ret_ftype = []
	for x in range(0, len(list)):
		if(ignorecvs and (len(list[x]) > 2) and (list[x][:2]!=".#")):
			ret_list.append(list[x])
			ret_ftype.append(ftype[x])
		elif (list[x] not in ignorelist):
			ret_list.append(list[x])
			ret_ftype.append(ftype[x])

	writemsg("cacheddirStats: H:%d/M:%d/S:%d\n" % (cacheHit, cacheMiss, cacheStale),10)
	return ret_list, ret_ftype

def listdir(mypath, recursive=False, filesonly=False, ignorecvs=False, ignorelist=[], followSymlinks=True,
	EmptyOnError=False, dirsonly=False):
	"""
	Portage-specific implementation of os.listdir

	@param mypath: Path whose contents you wish to list
	@type mypath: String
	@param recursive: Recursively scan directories contained within mypath
	@type recursive: Boolean
	@param filesonly; Only return files, not more directories
	@type filesonly: Boolean
	@param ignorecvs: Ignore CVS directories ('CVS','.svn','SCCS')
	@type ignorecvs: Boolean
	@param ignorelist: List of filenames/directories to exclude
	@type ignorelist: List
	@param followSymlinks: Follow Symlink'd files and directories
	@type followSymlinks: Boolean
	@param EmptyOnError: Return [] if an error occurs.
	@type EmptyOnError: Boolean
	@param dirsonly: Only return directories.
	@type dirsonly: Boolean
	@rtype: List
	@returns: A list of files and directories (or just files or just directories) or an empty list.
	"""

	list, ftype = cacheddir(mypath, ignorecvs, ignorelist, EmptyOnError, followSymlinks)

	if list is None:
		list=[]
	if ftype is None:
		ftype=[]

	if not (filesonly or dirsonly or recursive):
		return list

	if recursive:
		x=0
		while x<len(ftype):
			if ftype[x]==1 and not (ignorecvs and os.path.basename(list[x]) in ('CVS','.svn','SCCS')):
				l,f = cacheddir(mypath+"/"+list[x], ignorecvs, ignorelist, EmptyOnError,
					followSymlinks)

				l=l[:]
				for y in range(0,len(l)):
					l[y]=list[x]+"/"+l[y]
				list=list+l
				ftype=ftype+f
			x+=1
	if filesonly:
		rlist=[]
		for x in range(0,len(ftype)):
			if ftype[x]==0:
				rlist=rlist+[list[x]]
	elif dirsonly:
		rlist = []
		for x in range(0, len(ftype)):
			if ftype[x] == 1:
				rlist = rlist + [list[x]]	
	else:
		rlist=list

	return rlist

def flatten(mytokens):
	"""this function now turns a [1,[2,3]] list into
	a [1,2,3] list and returns it."""
	newlist=[]
	for x in mytokens:
		if type(x)==types.ListType:
			newlist.extend(flatten(x))
		else:
			newlist.append(x)
	return newlist

#beautiful directed graph object

class digraph:
	def __init__(self):
		"""Create an empty digraph"""
		
		# { node : ( { child : priority } , { parent : priority } ) }
		self.nodes = {}
		self.order = []

	def add(self, node, parent, priority=0):
		"""Adds the specified node with the specified parent.
		
		If the dep is a soft-dep and the node already has a hard
		relationship to the parent, the relationship is left as hard."""
		
		if node not in self.nodes:
			self.nodes[node] = ({}, {})
			self.order.append(node)
		
		if not parent:
			return
		
		if parent not in self.nodes:
			self.nodes[parent] = ({}, {})
			self.order.append(parent)
		
		if parent in self.nodes[node][1]:
			if priority > self.nodes[node][1][parent]:
				self.nodes[node][1][parent] = priority
		else:
			self.nodes[node][1][parent] = priority
		
		if node in self.nodes[parent][0]:
			if priority > self.nodes[parent][0][node]:
				self.nodes[parent][0][node] = priority
		else:
			self.nodes[parent][0][node] = priority

	def remove(self, node):
		"""Removes the specified node from the digraph, also removing
		and ties to other nodes in the digraph. Raises KeyError if the
		node doesn't exist."""
		
		if node not in self.nodes:
			raise KeyError(node)
		
		for parent in self.nodes[node][1]:
			del self.nodes[parent][0][node]
		for child in self.nodes[node][0]:
			del self.nodes[child][1][node]
		
		del self.nodes[node]
		self.order.remove(node)

	def contains(self, node):
		"""Checks if the digraph contains mynode"""
		return node in self.nodes

	def all_nodes(self):
		"""Return a list of all nodes in the graph"""
		return self.order[:]

	def child_nodes(self, node, ignore_priority=None):
		"""Return all children of the specified node"""
		if ignore_priority is None:
			return self.nodes[node][0].keys()
		children = []
		for child, priority in self.nodes[node][0].iteritems():
			if priority > ignore_priority:
				children.append(child)
		return children

	def parent_nodes(self, node):
		"""Return all parents of the specified node"""
		return self.nodes[node][1].keys()

	def leaf_nodes(self, ignore_priority=None):
		"""Return all nodes that have no children
		
		If ignore_soft_deps is True, soft deps are not counted as
		children in calculations."""
		
		leaf_nodes = []
		for node in self.order:
			is_leaf_node = True
			for child in self.nodes[node][0]:
				if self.nodes[node][0][child] > ignore_priority:
					is_leaf_node = False
					break
			if is_leaf_node:
				leaf_nodes.append(node)
		return leaf_nodes

	def root_nodes(self, ignore_priority=None):
		"""Return all nodes that have no parents.
		
		If ignore_soft_deps is True, soft deps are not counted as
		parents in calculations."""
		
		root_nodes = []
		for node in self.order:
			is_root_node = True
			for parent in self.nodes[node][1]:
				if self.nodes[node][1][parent] > ignore_priority:
					is_root_node = False
					break
			if is_root_node:
				root_nodes.append(node)
		return root_nodes

	def is_empty(self):
		"""Checks if the digraph is empty"""
		return len(self.nodes) == 0

	def clone(self):
		clone = digraph()
		clone.nodes = copy.deepcopy(self.nodes)
		clone.order = self.order[:]
		return clone

	# Backward compatibility
	addnode = add
	allnodes = all_nodes
	allzeros = leaf_nodes
	hasnode = contains
	empty = is_empty
	copy = clone

	def delnode(self, node):
		try:
			self.remove(node)
		except KeyError:
			pass

	def firstzero(self):
		leaf_nodes = self.leaf_nodes()
		if leaf_nodes:
			return leaf_nodes[0]
		return None

	def hasallzeros(self, ignore_priority=None):
		return len(self.leaf_nodes(ignore_priority=ignore_priority)) == \
			len(self.order)

	def debug_print(self):
		for node in self.nodes:
			print node,
			if self.nodes[node][0]:
				print "depends on"
			else:
				print "(no children)"
			for child in self.nodes[node][0]:
				print "  ",child,
				print "(%s)" % self.nodes[node][0][child]


_elog_atexit_handlers = []
def elog_process(cpv, mysettings):
	mylogfiles = listdir(mysettings["T"]+"/logging/")
	# shortcut for packages without any messages
	if len(mylogfiles) == 0:
		return
	# exploit listdir() file order so we process log entries in chronological order
	mylogfiles.reverse()
	mylogentries = {}
	my_elog_classes = set(mysettings.get("PORTAGE_ELOG_CLASSES", "").split())
	for f in mylogfiles:
		msgfunction, msgtype = f.split(".")
		if msgtype.upper() not in my_elog_classes \
				and msgtype.lower() not in my_elog_classes:
			continue
		if msgfunction not in portage_const.EBUILD_PHASES:
			writemsg("!!! can't process invalid log file: %s\n" % f,
				noiselevel=-1)
			continue
		if not msgfunction in mylogentries:
			mylogentries[msgfunction] = []
		msgcontent = open(mysettings["T"]+"/logging/"+f, "r").readlines()
		mylogentries[msgfunction].append((msgtype, msgcontent))

	# in case the filters matched all messages
	if len(mylogentries) == 0:
		return

	# generate a single string with all log messages
	fulllog = ""
	for phase in portage_const.EBUILD_PHASES:
		if not phase in mylogentries:
			continue
		for msgtype,msgcontent in mylogentries[phase]:
			fulllog += "%s: %s\n" % (msgtype, phase)
			for line in msgcontent:
				fulllog += line
			fulllog += "\n"

	# pass the processing to the individual modules
	logsystems = mysettings["PORTAGE_ELOG_SYSTEM"].split()
	for s in logsystems:
		# - is nicer than _ for module names, so allow people to use it.
		s = s.replace("-", "_")
		try:
			# FIXME: ugly ad.hoc import code
			# TODO:  implement a common portage module loader
			logmodule = __import__("elog_modules.mod_"+s)
			m = getattr(logmodule, "mod_"+s)
			def timeout_handler(signum, frame):
				raise portage_exception.PortageException(
					"Timeout in elog_process for system '%s'" % s)
			import signal
			signal.signal(signal.SIGALRM, timeout_handler)
			# Timeout after one minute (in case something like the mail
			# module gets hung).
			signal.alarm(60)
			try:
				m.process(mysettings, cpv, mylogentries, fulllog)
			finally:
				signal.alarm(0)
			if hasattr(m, "finalize") and not m.finalize in _elog_atexit_handlers:
				_elog_atexit_handlers.append(m.finalize)
				atexit_register(m.finalize, mysettings)
		except (ImportError, AttributeError), e:
			writemsg("!!! Error while importing logging modules " + \
				"while loading \"mod_%s\":\n" % str(s))
			writemsg("%s\n" % str(e), noiselevel=-1)
		except portage_exception.PortageException, e:
			writemsg("%s\n" % str(e), noiselevel=-1)

	# clean logfiles to avoid repetitions
	for f in mylogfiles:
		try:
			os.unlink(os.path.join(mysettings["T"], "logging", f))
		except OSError:
			pass

#parse /etc/env.d and generate /etc/profile.env

def env_update(makelinks=1, target_root=None, prev_mtimes=None, contents=None):
	if target_root is None:
		global root
		target_root = root
	if prev_mtimes is None:
		global mtimedb
		prev_mtimes = mtimedb["ldpath"]
	envd_dir = os.path.join(target_root, "etc", "env.d")
	portage_util.ensure_dirs(envd_dir, mode=0755)
	fns = listdir(envd_dir, EmptyOnError=1)
	fns.sort()
	templist = []
	for x in fns:
		if len(x) < 3:
			continue
		if not x[0].isdigit() or not x[1].isdigit():
			continue
		if x.startswith(".") or x.endswith("~") or x.endswith(".bak"):
			continue
		templist.append(x)
	fns = templist
	del templist

	space_separated = set(["CONFIG_PROTECT", "CONFIG_PROTECT_MASK"])
	colon_separated = set(["ADA_INCLUDE_PATH", "ADA_OBJECTS_PATH",
		"CLASSPATH", "INFODIR", "INFOPATH", "KDEDIRS", "LDPATH", "MANPATH",
		  "PATH", "PKG_CONFIG_PATH", "PRELINK_PATH", "PRELINK_PATH_MASK",
		  "PYTHONPATH", "ROOTPATH"])

	config_list = []

	for x in fns:
		file_path = os.path.join(envd_dir, x)
		try:
			myconfig = getconfig(file_path, expand=False)
		except portage_exception.ParseError, e:
			writemsg("!!! '%s'\n" % str(e), noiselevel=-1)
			del e
			continue
		if myconfig is None:
			# broken symlink or file removed by a concurrent process
			writemsg("!!! File Not Found: '%s'\n" % file_path, noiselevel=-1)
			continue
		config_list.append(myconfig)
		if "SPACE_SEPARATED" in myconfig:
			space_separated.update(myconfig["SPACE_SEPARATED"].split())
			del myconfig["SPACE_SEPARATED"]
		if "COLON_SEPARATED" in myconfig:
			colon_separated.update(myconfig["COLON_SEPARATED"].split())
			del myconfig["COLON_SEPARATED"]

	env = {}
	specials = {}
	for var in space_separated:
		mylist = []
		for myconfig in config_list:
			if var in myconfig:
				mylist.extend(filter(None, myconfig[var].split()))
				del myconfig[var] # prepare for env.update(myconfig)
		if mylist:
			env[var] = " ".join(mylist)
		specials[var] = mylist

	for var in colon_separated:
		mylist = []
		for myconfig in config_list:
			if var in myconfig:
				mylist.extend(filter(None, myconfig[var].split(":")))
				del myconfig[var] # prepare for env.update(myconfig)
		if mylist:
			env[var] = ":".join(mylist)
		specials[var] = mylist

	for myconfig in config_list:
		"""Cumulative variables have already been deleted from myconfig so that
		they won't be overwritten by this dict.update call."""
		env.update(myconfig)

	ldsoconf_path = os.path.join(target_root, "etc", "ld.so.conf")
	try:
		myld = open(ldsoconf_path)
		myldlines=myld.readlines()
		myld.close()
		oldld=[]
		for x in myldlines:
			#each line has at least one char (a newline)
			if x[0]=="#":
				continue
			oldld.append(x[:-1])
	except (IOError, OSError), e:
		if e.errno != errno.ENOENT:
			raise
		oldld = None

	ld_cache_update=False

	newld = specials["LDPATH"]
	if (oldld!=newld):
		#ld.so.conf needs updating and ldconfig needs to be run
		myfd = atomic_ofstream(ldsoconf_path)
		myfd.write("# ld.so.conf autogenerated by env-update; make all changes to\n")
		myfd.write("# contents of /etc/env.d directory\n")
		for x in specials["LDPATH"]:
			myfd.write(x+"\n")
		myfd.close()
		ld_cache_update=True

	# Update prelink.conf if we are prelink-enabled
	if prelink_capable:
		newprelink = atomic_ofstream(
			os.path.join(target_root, "etc", "prelink.conf"))
		newprelink.write("# prelink.conf autogenerated by env-update; make all changes to\n")
		newprelink.write("# contents of /etc/env.d directory\n")

		for x in ["/bin","/sbin","/usr/bin","/usr/sbin","/lib","/usr/lib"]:
			newprelink.write("-l "+x+"\n");
		for x in specials["LDPATH"]+specials["PATH"]+specials["PRELINK_PATH"]:
			if not x:
				continue
			if x[-1]!='/':
				x=x+"/"
			plmasked=0
			for y in specials["PRELINK_PATH_MASK"]:
				if not y:
					continue
				if y[-1]!='/':
					y=y+"/"
				if y==x[0:len(y)]:
					plmasked=1
					break
			if not plmasked:
				newprelink.write("-h "+x+"\n")
		for x in specials["PRELINK_PATH_MASK"]:
			newprelink.write("-b "+x+"\n")
		newprelink.close()

	mtime_changed = False
	lib_dirs = set()
	for lib_dir in portage_util.unique_array(specials["LDPATH"]+['usr/lib','usr/lib64','usr/lib32','lib','lib64','lib32']):
		x = os.path.join(target_root, lib_dir.lstrip(os.sep))
		try:
			newldpathtime = os.stat(x)[stat.ST_MTIME]
			lib_dirs.add(normalize_path(x))
		except OSError, oe:
			if oe.errno == errno.ENOENT:
				try:
					del prev_mtimes[x]
				except KeyError:
					pass
				# ignore this path because it doesn't exist
				continue
			raise
		if x in prev_mtimes:
			if prev_mtimes[x] == newldpathtime:
				pass
			else:
				prev_mtimes[x] = newldpathtime
				mtime_changed = True
		else:
			prev_mtimes[x] = newldpathtime
			mtime_changed = True

	if mtime_changed:
		ld_cache_update = True

	if makelinks and \
		not ld_cache_update and \
		contents is not None:
		libdir_contents_changed = False
		for mypath, mydata in contents.iteritems():
			if mydata[0] not in ("obj","sym"):
				continue
			head, tail = os.path.split(mypath)
			if head in lib_dirs:
				libdir_contents_changed = True
				break
		if not libdir_contents_changed:
			makelinks = False

	# Only run ldconfig as needed
	if (ld_cache_update or makelinks):
		# ldconfig has very different behaviour between FreeBSD and Linux
		if ostype=="Linux" or ostype.lower().endswith("gnu"):
			# We can't update links if we haven't cleaned other versions first, as
			# an older package installed ON TOP of a newer version will cause ldconfig
			# to overwrite the symlinks we just made. -X means no links. After 'clean'
			# we can safely create links.
			writemsg(">>> Regenerating %setc/ld.so.cache...\n" % target_root)
			if makelinks:
				commands.getstatusoutput("cd / ; /sbin/ldconfig -r '%s'" % target_root)
			else:
				commands.getstatusoutput("cd / ; /sbin/ldconfig -X -r '%s'" % target_root)
		elif ostype in ("FreeBSD","DragonFly"):
			writemsg(">>> Regenerating %svar/run/ld-elf.so.hints...\n" % target_root)
			commands.getstatusoutput(
				"cd / ; /sbin/ldconfig -elf -i -f '%svar/run/ld-elf.so.hints' '%setc/ld.so.conf'" % \
				(target_root, target_root))

	del specials["LDPATH"]

	penvnotice  = "# THIS FILE IS AUTOMATICALLY GENERATED BY env-update.\n"
	penvnotice += "# DO NOT EDIT THIS FILE. CHANGES TO STARTUP PROFILES\n"
	cenvnotice  = penvnotice[:]
	penvnotice += "# GO INTO /etc/profile NOT /etc/profile.env\n\n"
	cenvnotice += "# GO INTO /etc/csh.cshrc NOT /etc/csh.env\n\n"

	#create /etc/profile.env for bash support
	outfile = atomic_ofstream(os.path.join(target_root, "etc", "profile.env"))
	outfile.write(penvnotice)

	env_keys = [ x for x in env if x != "LDPATH" ]
	env_keys.sort()
	for x in env_keys:
		outfile.write("export %s='%s'\n" % (x, env[x]))
	outfile.close()

	#create /etc/csh.env for (t)csh support
	outfile = atomic_ofstream(os.path.join(target_root, "etc", "csh.env"))
	outfile.write(cenvnotice)
	for x in env_keys:
		outfile.write("setenv %s '%s'\n" % (x, env[x]))
	outfile.close()

def ExtractKernelVersion(base_dir):
	"""
	Try to figure out what kernel version we are running
	@param base_dir: Path to sources (usually /usr/src/linux)
	@type base_dir: string
	@rtype: tuple( version[string], error[string])
	@returns:
	1. tuple( version[string], error[string])
	Either version or error is populated (but never both)

	"""
	lines = []
	pathname = os.path.join(base_dir, 'Makefile')
	try:
		f = open(pathname, 'r')
	except OSError, details:
		return (None, str(details))
	except IOError, details:
		return (None, str(details))

	try:
		for i in range(4):
			lines.append(f.readline())
	except OSError, details:
		return (None, str(details))
	except IOError, details:
		return (None, str(details))

	lines = [l.strip() for l in lines]

	version = ''

	#XXX: The following code relies on the ordering of vars within the Makefile
	for line in lines:
		# split on the '=' then remove annoying whitespace
		items = line.split("=")
		items = [i.strip() for i in items]
		if items[0] == 'VERSION' or \
			items[0] == 'PATCHLEVEL':
			version += items[1]
			version += "."
		elif items[0] == 'SUBLEVEL':
			version += items[1]
		elif items[0] == 'EXTRAVERSION' and \
			items[-1] != items[0]:
			version += items[1]

	# Grab a list of files named localversion* and sort them
	localversions = os.listdir(base_dir)
	for x in range(len(localversions)-1,-1,-1):
		if localversions[x][:12] != "localversion":
			del localversions[x]
	localversions.sort()

	# Append the contents of each to the version string, stripping ALL whitespace
	for lv in localversions:
		version += "".join( " ".join( grabfile( base_dir+ "/" + lv ) ).split() )

	# Check the .config for a CONFIG_LOCALVERSION and append that too, also stripping whitespace
	kernelconfig = getconfig(base_dir+"/.config")
	if kernelconfig and kernelconfig.has_key("CONFIG_LOCALVERSION"):
		version += "".join(kernelconfig["CONFIG_LOCALVERSION"].split())

	return (version,None)

def autouse(myvartree, use_cache=1, mysettings=None):
	"""
	autuse returns a list of USE variables auto-enabled to packages being installed

	@param myvartree: Instance of the vartree class (from /var/db/pkg...)
	@type myvartree: vartree
	@param use_cache: read values from cache
	@type use_cache: Boolean
	@param mysettings: Instance of config
	@type mysettings: config
	@rtype: string
	@returns: A string containing a list of USE variables that are enabled via use.defaults
	"""
	if mysettings is None:
		global settings
		mysettings = settings
	if mysettings.profile_path is None:
		return ""
	myusevars=""
	usedefaults = mysettings.use_defs
	for myuse in usedefaults:
		dep_met = True
		for mydep in usedefaults[myuse]:
			if not myvartree.dep_match(mydep,use_cache=True):
				dep_met = False
				break
		if dep_met:
			myusevars += " "+myuse
	return myusevars

def check_config_instance(test):
	if not test or (str(test.__class__) != 'portage.config'):
		raise TypeError, "Invalid type for config object: %s" % test.__class__

class config:
	"""
	This class encompasses the main portage configuration.  Data is pulled from
	ROOT/PORTDIR/profiles/, from ROOT/etc/make.profile incrementally through all 
	parent profiles as well as from ROOT/PORTAGE_CONFIGROOT/* for user specified
	overrides.
	
	Generally if you need data like USE flags, FEATURES, environment variables,
	virtuals ...etc you look in here.
	"""
	
	def __init__(self, clone=None, mycpv=None, config_profile_path=None,
		config_incrementals=None, config_root=None, target_root=None,
		local_config=True):
		"""
		@param clone: If provided, init will use deepcopy to copy by value the instance.
		@type clone: Instance of config class.
		@param mycpv: CPV to load up (see setcpv), this is the same as calling init with mycpv=None
		and then calling instance.setcpv(mycpv).
		@type mycpv: String
		@param config_profile_path: Configurable path to the profile (usually PROFILE_PATH from portage_const)
		@type config_profile_path: String
		@param config_incrementals: List of incremental variables (usually portage_const.INCREMENTALS)
		@type config_incrementals: List
		@param config_root: path to read local config from (defaults to "/", see PORTAGE_CONFIGROOT)
		@type config_root: String
		@param target_root: __init__ override of $ROOT env variable.
		@type target_root: String
		@param local_config: Enables loading of local config (/etc/portage); used most by repoman to
		ignore local config (keywording and unmasking)
		@type local_config: Boolean
		"""

		debug = os.environ.get("PORTAGE_DEBUG") == "1"

		self.already_in_regenerate = 0

		self.locked   = 0
		self.mycpv    = None
		self.puse     = []
		self.modifiedkeys = []
		self.uvlist = []

		self.virtuals = {}
		self.virts_p = {}
		self.dirVirtuals = None
		self.v_count  = 0

		# Virtuals obtained from the vartree
		self.treeVirtuals = {}
		# Virtuals by user specification. Includes negatives.
		self.userVirtuals = {}
		# Virtual negatives from user specifications.
		self.negVirtuals  = {}

		self.user_profile_dir = None
		self.local_config = local_config

		if clone:
			self.incrementals = copy.deepcopy(clone.incrementals)
			self.profile_path = copy.deepcopy(clone.profile_path)
			self.user_profile_dir = copy.deepcopy(clone.user_profile_dir)
			self.local_config = copy.deepcopy(clone.local_config)

			self.module_priority = copy.deepcopy(clone.module_priority)
			self.modules         = copy.deepcopy(clone.modules)

			self.depcachedir = copy.deepcopy(clone.depcachedir)

			self.packages = copy.deepcopy(clone.packages)
			self.virtuals = copy.deepcopy(clone.virtuals)

			self.treeVirtuals = copy.deepcopy(clone.treeVirtuals)
			self.userVirtuals = copy.deepcopy(clone.userVirtuals)
			self.negVirtuals  = copy.deepcopy(clone.negVirtuals)

			self.use_defs = copy.deepcopy(clone.use_defs)
			self.usemask  = copy.deepcopy(clone.usemask)
			self.usemask_list = copy.deepcopy(clone.usemask_list)
			self.pusemask_list = copy.deepcopy(clone.pusemask_list)
			self.useforce      = copy.deepcopy(clone.useforce)
			self.useforce_list = copy.deepcopy(clone.useforce_list)
			self.puseforce_list = copy.deepcopy(clone.puseforce_list)
			self.puse     = copy.deepcopy(clone.puse)
			self.make_defaults_use = copy.deepcopy(clone.make_defaults_use)
			self.pkgprofileuse = copy.deepcopy(clone.pkgprofileuse)
			self.mycpv    = copy.deepcopy(clone.mycpv)

			self.configlist = copy.deepcopy(clone.configlist)
			self.lookuplist = self.configlist[:]
			self.lookuplist.reverse()
			self.configdict = {
				"env.d":     self.configlist[0],
				"pkginternal": self.configlist[1],
				"globals":     self.configlist[2],
				"defaults":    self.configlist[3],
				"conf":        self.configlist[4],
				"pkg":         self.configlist[5],
				"auto":        self.configlist[6],
				"backupenv":   self.configlist[7],
				"env":         self.configlist[8] }
			self.profiles = copy.deepcopy(clone.profiles)
			self.backupenv  = self.configdict["backupenv"]
			self.pusedict   = copy.deepcopy(clone.pusedict)
			self.categories = copy.deepcopy(clone.categories)
			self.pkeywordsdict = copy.deepcopy(clone.pkeywordsdict)
			self.pmaskdict = copy.deepcopy(clone.pmaskdict)
			self.punmaskdict = copy.deepcopy(clone.punmaskdict)
			self.prevmaskdict = copy.deepcopy(clone.prevmaskdict)
			self.pprovideddict = copy.deepcopy(clone.pprovideddict)
			self.dirVirtuals = copy.deepcopy(clone.dirVirtuals)
			self.treeVirtuals = copy.deepcopy(clone.treeVirtuals)
			self.features = copy.deepcopy(clone.features)
		else:

			# backupenv is for calculated incremental variables.
			self.backupenv = os.environ.copy()

			def check_var_directory(varname, var):
				if not os.path.isdir(var):
					writemsg(("!!! Error: %s='%s' is not a directory. " + \
						"Please correct this.\n") % (varname, var),
						noiselevel=-1)
					raise portage_exception.DirectoryNotFound(var)

			if config_root is None:
				config_root = "/"

			config_root = \
				normalize_path(config_root).rstrip(os.path.sep) + os.path.sep

			check_var_directory("PORTAGE_CONFIGROOT", config_root)

			self.depcachedir = DEPCACHE_PATH

			if not config_profile_path:
				config_profile_path = \
					os.path.join(config_root, PROFILE_PATH.lstrip(os.path.sep))
				if os.path.isdir(config_profile_path):
					self.profile_path = config_profile_path
				else:
					self.profile_path = None
			else:
				self.profile_path = config_profile_path[:]

			if not config_incrementals:
				writemsg("incrementals not specified to class config\n")
				self.incrementals = copy.deepcopy(portage_const.INCREMENTALS)
			else:
				self.incrementals = copy.deepcopy(config_incrementals)

			self.module_priority    = ["user","default"]
			self.modules            = {}
			self.modules["user"] = getconfig(
				os.path.join(config_root, MODULES_FILE_PATH.lstrip(os.path.sep)))
			if self.modules["user"] is None:
				self.modules["user"] = {}
			self.modules["default"] = {
				"portdbapi.metadbmodule": "cache.metadata.database",
				"portdbapi.auxdbmodule":  "cache.flat_hash.database",
			}

			self.usemask=[]
			self.configlist=[]

			# back up our incremental variables:
			self.configdict={}
			# configlist will contain: [ env.d, globals, defaults, conf, pkg, auto, backupenv, env ]
			self.configlist.append({})
			self.configdict["env.d"] = self.configlist[-1]

			self.configlist.append({})
			self.configdict["pkginternal"] = self.configlist[-1]

			# The symlink might not exist or might not be a symlink.
			if self.profile_path is None:
				self.profiles = []
			else:
				self.profiles = []
				def addProfile(currentPath):
					parentsFile = os.path.join(currentPath, "parent")
					if os.path.exists(parentsFile):
						parents = grabfile(parentsFile)
						if not parents:
							raise portage_exception.ParseError(
								"Empty parent file: '%s'" % parents_file)
						for parentPath in parents:
							parentPath = normalize_path(os.path.join(
								currentPath, parentPath))
							if os.path.exists(parentPath):
								addProfile(parentPath)
							else:
								raise portage_exception.ParseError(
									"Parent '%s' not found: '%s'" %  \
									(parentPath, parentsFile))
					self.profiles.append(currentPath)
				addProfile(os.path.realpath(self.profile_path))
			if local_config:
				custom_prof = os.path.join(
					config_root, CUSTOM_PROFILE_PATH.lstrip(os.path.sep))
				if os.path.exists(custom_prof):
					self.user_profile_dir = custom_prof
					self.profiles.append(custom_prof)
				del custom_prof

			self.packages_list = [grabfile_package(os.path.join(x, "packages")) for x in self.profiles]
			self.packages      = stack_lists(self.packages_list, incremental=1)
			del self.packages_list
			#self.packages = grab_stacked("packages", self.profiles, grabfile, incremental_lines=1)

			# revmaskdict
			self.prevmaskdict={}
			for x in self.packages:
				mycatpkg=dep_getkey(x)
				if not self.prevmaskdict.has_key(mycatpkg):
					self.prevmaskdict[mycatpkg]=[x]
				else:
					self.prevmaskdict[mycatpkg].append(x)

			# get profile-masked use flags -- INCREMENTAL Child over parent
			self.usemask_list = [grabfile(os.path.join(x, "use.mask")) \
				for x in self.profiles]
			self.usemask  = set(stack_lists(
				self.usemask_list, incremental=True))
			use_defs_lists = [grabdict(os.path.join(x, "use.defaults")) for x in self.profiles]
			self.use_defs  = stack_dictlist(use_defs_lists, incremental=True)
			del use_defs_lists

			self.pusemask_list = []
			rawpusemask = [grabdict_package(
				os.path.join(x, "package.use.mask")) \
				for x in self.profiles]
			for i in xrange(len(self.profiles)):
				cpdict = {}
				for k, v in rawpusemask[i].iteritems():
					cpdict.setdefault(dep_getkey(k), {})[k] = v
				self.pusemask_list.append(cpdict)
			del rawpusemask

			self.pkgprofileuse = []
			rawprofileuse = [grabdict_package(
				os.path.join(x, "package.use"), juststrings=True) \
				for x in self.profiles]
			for i in xrange(len(self.profiles)):
				cpdict = {}
				for k, v in rawprofileuse[i].iteritems():
					cpdict.setdefault(dep_getkey(k), {})[k] = v
				self.pkgprofileuse.append(cpdict)
			del rawprofileuse

			self.useforce_list = [grabfile(os.path.join(x, "use.force")) \
				for x in self.profiles]
			self.useforce  = set(stack_lists(
				self.useforce_list, incremental=True))

			self.puseforce_list = []
			rawpuseforce = [grabdict_package(
				os.path.join(x, "package.use.force")) \
				for x in self.profiles]
			for i in xrange(len(self.profiles)):
				cpdict = {}
				for k, v in rawpuseforce[i].iteritems():
					cpdict.setdefault(dep_getkey(k), {})[k] = v
				self.puseforce_list.append(cpdict)
			del rawpuseforce

			try:
				self.mygcfg   = getconfig(os.path.join(config_root, "etc", "make.globals"))

				if self.mygcfg is None:
					self.mygcfg = {}
			except SystemExit, e:
				raise
			except Exception, e:
				if debug:
					raise
				writemsg("!!! %s\n" % (e), noiselevel=-1)
				if not isinstance(e, EnvironmentError):
					writemsg("!!! Incorrect multiline literals can cause " + \
						"this. Do not use them.\n", noiselevel=-1)
				sys.exit(1)
			self.configlist.append(self.mygcfg)
			self.configdict["globals"]=self.configlist[-1]

			self.make_defaults_use = []
			self.mygcfg = {}
			if self.profiles:
				try:
					mygcfg_dlists = [getconfig(os.path.join(x, "make.defaults")) for x in self.profiles]
					for cfg in mygcfg_dlists:
						if cfg:
							self.make_defaults_use.append(cfg.get("USE", ""))
						else:
							self.make_defaults_use.append("")
					self.mygcfg   = stack_dicts(mygcfg_dlists, incrementals=portage_const.INCREMENTALS, ignore_none=1)
					#self.mygcfg = grab_stacked("make.defaults", self.profiles, getconfig)
					if self.mygcfg is None:
						self.mygcfg = {}
				except SystemExit, e:
					raise
				except Exception, e:
					if debug:
						raise
					writemsg("!!! %s\n" % (e), noiselevel=-1)
					if not isinstance(e, EnvironmentError):
						writemsg("!!! 'rm -Rf /usr/portage/profiles; " + \
							"emerge sync' may fix this. If it does\n",
							noiselevel=-1)
						writemsg("!!! not then please report this to " + \
							"bugs.gentoo.org and, if possible, a dev\n",
								noiselevel=-1)
						writemsg("!!! on #gentoo (irc.freenode.org)\n",
							noiselevel=-1)
					sys.exit(1)
			self.configlist.append(self.mygcfg)
			self.configdict["defaults"]=self.configlist[-1]

			try:
				self.mygcfg = getconfig(
					os.path.join(config_root, MAKE_CONF_FILE.lstrip(os.path.sep)),
					allow_sourcing=True)
				if self.mygcfg is None:
					self.mygcfg = {}
			except SystemExit, e:
				raise
			except Exception, e:
				if debug:
					raise
				writemsg("!!! %s\n" % (e), noiselevel=-1)
				if not isinstance(e, EnvironmentError):
					writemsg("!!! Incorrect multiline literals can cause " + \
						"this. Do not use them.\n", noiselevel=-1)
				sys.exit(1)

			# Allow ROOT setting to come from make.conf if it's not overridden
			# by the constructor argument (from the calling environment).  As a
			# special exception for a very common use case, config_root == "/"
			# implies that ROOT in make.conf should be ignored.  That way, the
			# user can chroot into $ROOT and the ROOT setting in make.conf will
			# be automatically ignored (unless config_root is other than "/").
			if config_root != "/" and \
				target_root is None and "ROOT" in self.mygcfg:
				target_root = self.mygcfg["ROOT"]
			
			self.configlist.append(self.mygcfg)
			self.configdict["conf"]=self.configlist[-1]

			self.configlist.append({})
			self.configdict["pkg"]=self.configlist[-1]

			#auto-use:
			self.configlist.append({})
			self.configdict["auto"]=self.configlist[-1]

			self.configlist.append(self.backupenv) # XXX Why though?
			self.configdict["backupenv"]=self.configlist[-1]

			self.configlist.append(os.environ.copy())
			self.configdict["env"]=self.configlist[-1]


			# make lookuplist for loading package.*
			self.lookuplist=self.configlist[:]
			self.lookuplist.reverse()

			# Blacklist vars that could interfere with portage internals.
			for blacklisted in ["PKGUSE", "PORTAGE_CONFIGROOT", "ROOT"]:
				for cfg in self.lookuplist:
					try:
						del cfg[blacklisted]
					except KeyError:
						pass
			del blacklisted, cfg

			if target_root is None:
				target_root = "/"

			target_root = \
				normalize_path(target_root).rstrip(os.path.sep) + os.path.sep

			check_var_directory("ROOT", target_root)

			env_d = getconfig(
				os.path.join(target_root, "etc", "profile.env"), expand=False)
			# env_d will be None if profile.env doesn't exist.
			if env_d:
				self.configdict["env.d"].update(env_d)
				# Remove duplicate values so they don't override updated
				# profile.env values later (profile.env is reloaded in each
				# call to self.regenerate).
				for cfg in (self.configdict["backupenv"],
					self.configdict["env"]):
					for k, v in env_d.iteritems():
						try:
							if cfg[k] == v:
								del cfg[k]
						except KeyError:
							pass
				del cfg, k, v

			self["PORTAGE_CONFIGROOT"] = config_root
			self.backup_changes("PORTAGE_CONFIGROOT")
			self["ROOT"] = target_root
			self.backup_changes("ROOT")

			self.pusedict = {}
			self.pkeywordsdict = {}
			self.punmaskdict = {}
			abs_user_config = os.path.join(config_root,
				USER_CONFIG_PATH.lstrip(os.path.sep))

			# locations for "categories" and "arch.list" files
			locations = [os.path.join(self["PORTDIR"], "profiles")]
			pmask_locations = [os.path.join(self["PORTDIR"], "profiles")]
			pmask_locations.extend(self.profiles)

			""" repoman controls PORTDIR_OVERLAY via the environment, so no
			special cases are needed here."""
			overlay_profiles = []
			for ov in self["PORTDIR_OVERLAY"].split():
				ov = normalize_path(ov)
				profiles_dir = os.path.join(ov, "profiles")
				if os.path.isdir(profiles_dir):
					overlay_profiles.append(profiles_dir)
			locations += overlay_profiles
			
			pmask_locations.extend(overlay_profiles)

			if local_config:
				locations.append(abs_user_config)
				pmask_locations.append(abs_user_config)
				pusedict = grabdict_package(
					os.path.join(abs_user_config, "package.use"), recursive=1)
				for key in pusedict.keys():
					cp = dep_getkey(key)
					if not self.pusedict.has_key(cp):
						self.pusedict[cp] = {}
					self.pusedict[cp][key] = pusedict[key]

				#package.keywords
				pkgdict = grabdict_package(
					os.path.join(abs_user_config, "package.keywords"),
					recursive=1)
				for key in pkgdict.keys():
					# default to ~arch if no specific keyword is given
					if not pkgdict[key]:
						mykeywordlist = []
						if self.configdict["defaults"] and self.configdict["defaults"].has_key("ACCEPT_KEYWORDS"):
							groups = self.configdict["defaults"]["ACCEPT_KEYWORDS"].split()
						else:
							groups = []
						for keyword in groups:
							if not keyword[0] in "~-":
								mykeywordlist.append("~"+keyword)
						pkgdict[key] = mykeywordlist
					cp = dep_getkey(key)
					if not self.pkeywordsdict.has_key(cp):
						self.pkeywordsdict[cp] = {}
					self.pkeywordsdict[cp][key] = pkgdict[key]

				#package.unmask
				pkgunmasklines = grabfile_package(
					os.path.join(abs_user_config, "package.unmask"),
					recursive=1)
				for x in pkgunmasklines:
					mycatpkg=dep_getkey(x)
					if self.punmaskdict.has_key(mycatpkg):
						self.punmaskdict[mycatpkg].append(x)
					else:
						self.punmaskdict[mycatpkg]=[x]

			#getting categories from an external file now
			categories = [grabfile(os.path.join(x, "categories")) for x in locations]
			self.categories = stack_lists(categories, incremental=1)
			del categories

			archlist = [grabfile(os.path.join(x, "arch.list")) for x in locations]
			archlist = stack_lists(archlist, incremental=1)
			self.configdict["conf"]["PORTAGE_ARCHLIST"] = " ".join(archlist)

			#package.mask
			pkgmasklines = []
			for x in pmask_locations:
				pkgmasklines.append(grabfile_package(
					os.path.join(x, "package.mask"), recursive=1))
			pkgmasklines = stack_lists(pkgmasklines, incremental=1)

			self.pmaskdict = {}
			for x in pkgmasklines:
				mycatpkg=dep_getkey(x)
				if self.pmaskdict.has_key(mycatpkg):
					self.pmaskdict[mycatpkg].append(x)
				else:
					self.pmaskdict[mycatpkg]=[x]

			pkgprovidedlines = [grabfile(os.path.join(x, "package.provided")) for x in self.profiles]
			pkgprovidedlines = stack_lists(pkgprovidedlines, incremental=1)
			has_invalid_data = False
			for x in range(len(pkgprovidedlines)-1, -1, -1):
				myline = pkgprovidedlines[x]
				if not isvalidatom("=" + myline):
					writemsg("Invalid package name in package.provided:" + \
						" %s\n" % myline, noiselevel=-1)
					has_invalid_data = True
					del pkgprovidedlines[x]
					continue
				cpvr = catpkgsplit(pkgprovidedlines[x])
				if not cpvr or cpvr[0] == "null":
					writemsg("Invalid package name in package.provided: "+pkgprovidedlines[x]+"\n",
						noiselevel=-1)
					has_invalid_data = True
					del pkgprovidedlines[x]
					continue
				if cpvr[0] == "virtual":
					writemsg("Virtual package in package.provided: %s\n" % \
						myline, noiselevel=-1)
					has_invalid_data = True
					del pkgprovidedlines[x]
					continue
			if has_invalid_data:
				writemsg("See portage(5) for correct package.provided usage.\n",
					noiselevel=-1)
			self.pprovideddict = {}
			for x in pkgprovidedlines:
				cpv=catpkgsplit(x)
				if not x:
					continue
				mycatpkg=dep_getkey(x)
				if self.pprovideddict.has_key(mycatpkg):
					self.pprovideddict[mycatpkg].append(x)
				else:
					self.pprovideddict[mycatpkg]=[x]

			# reasonable defaults; this is important as without USE_ORDER,
			# USE will always be "" (nothing set)!
			if "USE_ORDER" not in self:
				self.backupenv["USE_ORDER"] = "env:pkg:conf:defaults:pkginternal"

			self["PORTAGE_GID"] = str(portage_gid)
			self.backup_changes("PORTAGE_GID")

			if self.get("PORTAGE_DEPCACHEDIR", None):
				self.depcachedir = self["PORTAGE_DEPCACHEDIR"]
			self["PORTAGE_DEPCACHEDIR"] = self.depcachedir
			self.backup_changes("PORTAGE_DEPCACHEDIR")

			overlays = self.get("PORTDIR_OVERLAY","").split()
			if overlays:
				new_ov = []
				for ov in overlays:
					ov = normalize_path(ov)
					if os.path.isdir(ov):
						new_ov.append(ov)
					else:
						writemsg("!!! Invalid PORTDIR_OVERLAY" + \
							" (not a dir): '%s'\n" % ov, noiselevel=-1)
				self["PORTDIR_OVERLAY"] = " ".join(new_ov)
				self.backup_changes("PORTDIR_OVERLAY")

			if "CBUILD" not in self and "CHOST" in self:
				self["CBUILD"] = self["CHOST"]
				self.backup_changes("CBUILD")

			self["PORTAGE_BIN_PATH"] = PORTAGE_BIN_PATH
			self.backup_changes("PORTAGE_BIN_PATH")
			self["PORTAGE_PYM_PATH"] = PORTAGE_PYM_PATH
			self.backup_changes("PORTAGE_PYM_PATH")

			for var in ("PORTAGE_INST_UID", "PORTAGE_INST_GID"):
				try:
					self[var] = str(int(self.get(var, "0")))
				except ValueError:
					writemsg(("!!! %s='%s' is not a valid integer.  " + \
						"Falling back to '0'.\n") % (var, self[var]),
						noiselevel=-1)
					self[var] = "0"
				self.backup_changes(var)

			self.regenerate()
			self.features = portage_util.unique_array(self["FEATURES"].split())

			if "gpg" in self.features:
				if not os.path.exists(self["PORTAGE_GPG_DIR"]) or \
					not os.path.isdir(self["PORTAGE_GPG_DIR"]):
					writemsg(colorize("BAD", "PORTAGE_GPG_DIR is invalid." + \
						" Removing gpg from FEATURES.\n"), noiselevel=-1)
					self.features.remove("gpg")

			if not portage_exec.sandbox_capable and \
				("sandbox" in self.features or "usersandbox" in self.features):
				if self.profile_path is not None and \
					os.path.realpath(self.profile_path) == \
					os.path.realpath(PROFILE_PATH):
					""" Don't show this warning when running repoman and the
					sandbox feature came from a profile that doesn't belong to
					the user."""
					writemsg(colorize("BAD", "!!! Problem with sandbox" + \
						" binary. Disabling...\n\n"), noiselevel=-1)
				if "sandbox" in self.features:
					self.features.remove("sandbox")
				if "usersandbox" in self.features:
					self.features.remove("usersandbox")

			self.features.sort()
			self["FEATURES"] = " ".join(self.features)
			self.backup_changes("FEATURES")

			self._init_dirs()

		if mycpv:
			self.setcpv(mycpv)

	def _init_dirs(self):
		"""
		Create a few directories that are critical to portage operation
		"""
		if not os.access(self["ROOT"], os.W_OK):
			return

		dir_mode_map = {
			"tmp"             :(-1,          01777, 0),
			"var/tmp"         :(-1,          01777, 0),
			"var/lib/portage" :(portage_gid, 02750, 02),
			"var/cache/edb"   :(portage_gid,  0755, 02)
		}

		for mypath, (gid, mode, modemask) in dir_mode_map.iteritems():
			try:
				mydir = os.path.join(self["ROOT"], mypath)
				portage_util.ensure_dirs(mydir, gid=gid, mode=mode, mask=modemask)
			except portage_exception.PortageException, e:
				writemsg("!!! Directory initialization failed: '%s'\n" % mydir,
					noiselevel=-1)
				writemsg("!!! %s\n" % str(e),
					noiselevel=-1)

	def validate(self):
		"""Validate miscellaneous settings and display warnings if necessary.
		(This code was previously in the global scope of portage.py)"""

		groups = self["ACCEPT_KEYWORDS"].split()
		archlist = self.archlist()
		if not archlist:
			writemsg("--- 'profiles/arch.list' is empty or not available. Empty portage tree?\n")
		else:
			for group in groups:
				if group not in archlist and group[0] != '-':
					writemsg("!!! INVALID ACCEPT_KEYWORDS: %s\n" % str(group),
						noiselevel=-1)

		abs_profile_path = os.path.join(self["PORTAGE_CONFIGROOT"],
			PROFILE_PATH.lstrip(os.path.sep))
		if not os.path.islink(abs_profile_path) and \
			not os.path.exists(os.path.join(abs_profile_path, "parent")) and \
			os.path.exists(os.path.join(self["PORTDIR"], "profiles")):
			writemsg("\a\n\n!!! %s is not a symlink and will probably prevent most merges.\n" % abs_profile_path,
				noiselevel=-1)
			writemsg("!!! It should point into a profile within %s/profiles/\n" % self["PORTDIR"])
			writemsg("!!! (You can safely ignore this message when syncing. It's harmless.)\n\n\n")

		abs_user_virtuals = os.path.join(self["PORTAGE_CONFIGROOT"],
			USER_VIRTUALS_FILE.lstrip(os.path.sep))
		if os.path.exists(abs_user_virtuals):
			writemsg("\n!!! /etc/portage/virtuals is deprecated in favor of\n")
			writemsg("!!! /etc/portage/profile/virtuals. Please move it to\n")
			writemsg("!!! this new location.\n\n")

	def loadVirtuals(self,root):
		"""Not currently used by portage."""
		writemsg("DEPRECATED: portage.config.loadVirtuals\n")
		self.getvirtuals(root)

	def load_best_module(self,property_string):
		best_mod = best_from_dict(property_string,self.modules,self.module_priority)
		try:
			mod = load_mod(best_mod)
		except ImportError:
			dump_traceback(red("Error: Failed to import module '%s'") % best_mod, noiselevel=0)
			sys.exit(1)
		return mod

	def lock(self):
		self.locked = 1

	def unlock(self):
		self.locked = 0

	def modifying(self):
		if self.locked:
			raise Exception, "Configuration is locked."

	def backup_changes(self,key=None):
		self.modifying()
		if key and self.configdict["env"].has_key(key):
			self.backupenv[key] = copy.deepcopy(self.configdict["env"][key])
		else:
			raise KeyError, "No such key defined in environment: %s" % key

	def reset(self,keeping_pkg=0,use_cache=1):
		"""
		Restore environment from self.backupenv, call self.regenerate()
		@param keeping_pkg: Should we keep the set_cpv() data or delete it.
		@type keeping_pkg: Boolean
		@param use_cache: Should self.regenerate use the cache or not
		@type use_cache: Boolean
		@rype: None
		"""
		self.modifying()
		self.configdict["env"].clear()
		self.configdict["env"].update(self.backupenv)

		self.modifiedkeys = []
		if not keeping_pkg:
			self.mycpv = None
			self.puse = ""
			self.configdict["pkg"].clear()
			self.configdict["pkginternal"].clear()
			self.configdict["defaults"]["USE"] = \
				" ".join(self.make_defaults_use)
			self.usemask  = set(stack_lists(
				self.usemask_list, incremental=True))
			self.useforce  = set(stack_lists(
				self.useforce_list, incremental=True))
		self.regenerate(use_cache=use_cache)

	def load_infodir(self,infodir):
		self.modifying()
		if self.configdict.has_key("pkg"):
			for x in self.configdict["pkg"].keys():
				del self.configdict["pkg"][x]
		else:
			writemsg("No pkg setup for settings instance?\n",
				noiselevel=-1)
			sys.exit(17)

		if os.path.exists(infodir):
			if os.path.exists(infodir+"/environment"):
				self.configdict["pkg"]["PORT_ENV_FILE"] = infodir+"/environment"

			myre = re.compile('^[A-Z]+$')
			null_byte = "\0"
			for filename in listdir(infodir,filesonly=1,EmptyOnError=1):
				if myre.match(filename):
					try:
						file_path = os.path.join(infodir, filename)
						mydata = open(file_path).read().strip()
						if len(mydata) < 2048 or filename == "USE":
							if null_byte in mydata:
								writemsg("!!! Null byte found in metadata " + \
									"file: '%s'\n" % file_path, noiselevel=-1)
								continue
							if filename == "USE":
								binpkg_flags = "-* " + mydata
								self.configdict["pkg"][filename] = binpkg_flags
								self.configdict["env"][filename] = mydata
							else:
								self.configdict["pkg"][filename] = mydata
								self.configdict["env"][filename] = mydata
						# CATEGORY is important because it's used in doebuild
						# to infer the cpv.  If it's corrupted, it leads to
						# strange errors later on, so we'll validate it and
						# print a warning if necessary.
						if filename == "CATEGORY":
							matchobj = re.match("[-a-zA-Z0-9_.+]+", mydata)
							if not matchobj or matchobj.start() != 0 or \
								matchobj.end() != len(mydata):
								writemsg("!!! CATEGORY file is corrupt: %s\n" % \
									os.path.join(infodir, filename), noiselevel=-1)
					except (OSError, IOError):
						writemsg("!!! Unable to read file: %s\n" % infodir+"/"+filename,
							noiselevel=-1)
						pass
			return 1
		return 0

	def setcpv(self, mycpv, use_cache=1, mydb=None):
		"""
		Load a particular CPV into the config, this lets us see the
		Default USE flags for a particular ebuild as well as the USE
		flags from package.use.

		@param mycpv: A cpv to load
		@type mycpv: string
		@param use_cache: Enables caching
		@type use_cache: Boolean
		@param mydb: a dbapi instance that supports aux_get with the IUSE key.
		@type mydb: dbapi or derivative.
		@rtype: None
		"""

		self.modifying()
		if self.mycpv == mycpv:
			return
		has_changed = False
		self.mycpv = mycpv
		cp = dep_getkey(mycpv)
		pkginternaluse = ""
		if mydb:
			pkginternaluse = " ".join([x[1:] \
				for x in mydb.aux_get(mycpv, ["IUSE"])[0].split() \
				if x.startswith("+")])
		if pkginternaluse != self.configdict["pkginternal"].get("USE", ""):
			self.configdict["pkginternal"]["USE"] = pkginternaluse
			has_changed = True
		defaults = []
		for i in xrange(len(self.profiles)):
			defaults.append(self.make_defaults_use[i])
			cpdict = self.pkgprofileuse[i].get(cp, None)
			if cpdict:
				best_match = best_match_to_list(self.mycpv, cpdict.keys())
				if best_match:
					defaults.append(cpdict[best_match])
		defaults = " ".join(defaults)
		if defaults != self.configdict["defaults"].get("USE",""):
			self.configdict["defaults"]["USE"] = defaults
			has_changed = True
		useforce = []
		for i in xrange(len(self.profiles)):
			useforce.append(self.useforce_list[i])
			cpdict = self.puseforce_list[i].get(cp, None)
			if cpdict:
				best_match = best_match_to_list(self.mycpv, cpdict.keys())
				if best_match:
					useforce.append(cpdict[best_match])
		useforce = set(stack_lists(useforce, incremental=True))
		if useforce != self.useforce:
			self.useforce = useforce
			has_changed = True
		usemask = []
		for i in xrange(len(self.profiles)):
			usemask.append(self.usemask_list[i])
			cpdict = self.pusemask_list[i].get(cp, None)
			if cpdict:
				best_match = best_match_to_list(self.mycpv, cpdict.keys())
				if best_match:
					usemask.append(cpdict[best_match])
		usemask = set(stack_lists(usemask, incremental=True))
		if usemask != self.usemask:
			self.usemask = usemask
			has_changed = True
		oldpuse = self.puse
		self.puse = ""
		if self.pusedict.has_key(cp):
			self.pusekey = best_match_to_list(self.mycpv, self.pusedict[cp].keys())
			if self.pusekey:
				self.puse = " ".join(self.pusedict[cp][self.pusekey])
		if oldpuse != self.puse:
			has_changed = True
		self.configdict["pkg"]["PKGUSE"] = self.puse[:] # For saving to PUSE file
		self.configdict["pkg"]["USE"]    = self.puse[:] # this gets appended to USE
		# CATEGORY is essential for doebuild calls
		self.configdict["pkg"]["CATEGORY"] = mycpv.split("/")[0]
		if has_changed:
			self.reset(keeping_pkg=1,use_cache=use_cache)

	def setinst(self,mycpv,mydbapi):
		self.modifying()
		if len(self.virtuals) == 0:
			self.getvirtuals()
		# Grab the virtuals this package provides and add them into the tree virtuals.
		provides = mydbapi.aux_get(mycpv, ["PROVIDE"])[0]
		if isinstance(mydbapi, portdbapi):
			myuse = self["USE"]
		else:
			myuse = mydbapi.aux_get(mycpv, ["USE"])[0]
		virts = flatten(portage_dep.use_reduce(portage_dep.paren_reduce(provides), uselist=myuse.split()))

		cp = dep_getkey(mycpv)
		for virt in virts:
			virt = dep_getkey(virt)
			if not self.treeVirtuals.has_key(virt):
				self.treeVirtuals[virt] = []
			# XXX: Is this bad? -- It's a permanent modification
			if cp not in self.treeVirtuals[virt]:
				self.treeVirtuals[virt].append(cp)

		self.virtuals = self.__getvirtuals_compile()


	def regenerate(self,useonly=0,use_cache=1):
		"""
		Regenerate settings
		This involves regenerating valid USE flags, re-expanding USE_EXPAND flags
		re-stacking USE flags (-flag and -*), as well as any other INCREMENTAL
		variables.  This also updates the env.d configdict; useful in case an ebuild
		changes the environment.

		If FEATURES has already stacked, it is not stacked twice.

		@param useonly: Only regenerate USE flags (not any other incrementals)
		@type useonly: Boolean
		@param use_cache: Enable Caching (only for autouse)
		@type use_cache: Boolean
		@rtype: None
		"""

		self.modifying()
		if self.already_in_regenerate:
			# XXX: THIS REALLY NEEDS TO GET FIXED. autouse() loops.
			writemsg("!!! Looping in regenerate.\n",1)
			return
		else:
			self.already_in_regenerate = 1

		# We grab the latest profile.env here since it changes frequently.
		self.configdict["env.d"].clear()
		env_d = getconfig(
			os.path.join(self["ROOT"], "etc", "profile.env"), expand=False)
		if env_d:
			# env_d will be None if profile.env doesn't exist.
			self.configdict["env.d"].update(env_d)

		if useonly:
			myincrementals=["USE"]
		else:
			myincrementals = self.incrementals
		myincrementals = set(myincrementals)
		# If self.features exists, it has already been stacked and may have
		# been mutated, so don't stack it again or else any mutations will be
		# reverted.
		if "FEATURES" in myincrementals and hasattr(self, "features"):
			myincrementals.remove("FEATURES")

		if "USE" in myincrementals:
			# Process USE last because it depends on USE_EXPAND which is also
			# an incremental!
			myincrementals.remove("USE")

		for mykey in myincrementals:

			mydbs=self.configlist[:-1]

			myflags=[]
			for curdb in mydbs:
				if mykey not in curdb:
					continue
				#variables are already expanded
				mysplit = curdb[mykey].split()

				for x in mysplit:
					if x=="-*":
						# "-*" is a special "minus" var that means "unset all settings".
						# so USE="-* gnome" will have *just* gnome enabled.
						myflags = []
						continue

					if x[0]=="+":
						# Not legal. People assume too much. Complain.
						writemsg(red("USE flags should not start with a '+': %s\n" % x),
							noiselevel=-1)
						x=x[1:]
						if not x:
							continue

					if (x[0]=="-"):
						if (x[1:] in myflags):
							# Unset/Remove it.
							del myflags[myflags.index(x[1:])]
						continue

					# We got here, so add it now.
					if x not in myflags:
						myflags.append(x)

			myflags.sort()
			#store setting in last element of configlist, the original environment:
			if myflags or mykey in self:
				self.configlist[-1][mykey] = " ".join(myflags)
			del myflags

		# Do the USE calculation last because it depends on USE_EXPAND.
		if "auto" in self["USE_ORDER"].split(":"):
			self.configdict["auto"]["USE"] = autouse(
				vartree(root=self["ROOT"], categories=self.categories,
					settings=self),
				use_cache=use_cache, mysettings=self)
		else:
			self.configdict["auto"]["USE"] = ""

		use_expand_protected = []
		use_expand = self.get("USE_EXPAND", "").split()
		for var in use_expand:
			var_lower = var.lower()
			for x in self.get(var, "").split():
				# Any incremental USE_EXPAND variables have already been
				# processed, so leading +/- operators are invalid here.
				if x[0] == "+":
					writemsg(colorize("BAD", "Invalid '+' operator in " + \
						"non-incremental variable '%s': '%s'\n" % (var, x)),
						noiselevel=-1)
					x = x[1:]
				if x[0] == "-":
					writemsg(colorize("BAD", "Invalid '-' operator in " + \
						"non-incremental variable '%s': '%s'\n" % (var, x)),
						noiselevel=-1)
					continue
				mystr = var_lower + "_" + x
				if mystr not in use_expand_protected:
					use_expand_protected.append(mystr)

		if not self.uvlist:
			for x in self["USE_ORDER"].split(":"):
				if x in self.configdict:
					self.uvlist.append(self.configdict[x])
			self.uvlist.reverse()

		myflags = use_expand_protected[:]
		for curdb in self.uvlist:
			if "USE" not in curdb:
				continue
			mysplit = curdb["USE"].split()
			for x in mysplit:
				if x == "-*":
					myflags = use_expand_protected[:]
					continue

				if x[0] == "+":
					writemsg(colorize("BAD", "USE flags should not start " + \
						"with a '+': %s\n" % x), noiselevel=-1)
					x = x[1:]
					if not x:
						continue

				if x[0] == "-":
					try:
						myflags.remove(x[1:])
					except ValueError:
						pass
					continue

				if x not in myflags:
					myflags.append(x)

		myflags = set(myflags)
		myflags.update(self.useforce)

		# FEATURES=test should imply USE=test
		if "test" in self.configlist[-1].get("FEATURES","").split():
			myflags.add("test")

		usesplit = [ x for x in myflags if \
			x not in self.usemask]

		usesplit.sort()

		# Use the calculated USE flags to regenerate the USE_EXPAND flags so
		# that they are consistent.
		for var in use_expand:
			prefix = var.lower() + "_"
			prefix_len = len(prefix)
			expand_flags = set([ x[prefix_len:] for x in usesplit \
				if x.startswith(prefix) ])
			var_split = self.get(var, "").split()
			# Preserve the order of var_split because it can matter for things
			# like LINGUAS.
			var_split = [ x for x in var_split if x in expand_flags ]
			var_split.extend(expand_flags.difference(var_split))
			if var_split or var in self:
				# Don't export empty USE_EXPAND vars unless the user config
				# exports them as empty.  This is required for vars such as
				# LINGUAS, where unset and empty have different meanings.
				self[var] = " ".join(var_split)

		# Pre-Pend ARCH variable to USE settings so '-*' in env doesn't kill arch.
		if self.configdict["defaults"].has_key("ARCH"):
			if self.configdict["defaults"]["ARCH"]:
				if self.configdict["defaults"]["ARCH"] not in usesplit:
					usesplit.insert(0,self.configdict["defaults"]["ARCH"])

		self.configlist[-1]["USE"]= " ".join(usesplit)

		self.already_in_regenerate = 0

	def get_virts_p(self, myroot):
		if self.virts_p:
			return self.virts_p
		virts = self.getvirtuals(myroot)
		if virts:
			myvkeys = virts.keys()
			for x in myvkeys:
				vkeysplit = x.split("/")
				if not self.virts_p.has_key(vkeysplit[1]):
					self.virts_p[vkeysplit[1]] = virts[x]
		return self.virts_p

	def getvirtuals(self, myroot=None):
		"""myroot is now ignored because, due to caching, it has always been
		broken for all but the first call."""
		myroot = self["ROOT"]
		if self.virtuals:
			return self.virtuals

		virtuals_list = []
		for x in self.profiles:
			virtuals_file = os.path.join(x, "virtuals")
			virtuals_dict = grabdict(virtuals_file)
			for k in virtuals_dict.keys():
				if not isvalidatom(k) or dep_getkey(k) != k:
					writemsg("--- Invalid virtuals atom in %s: %s\n" % \
						(virtuals_file, k), noiselevel=-1)
					del virtuals_dict[k]
					continue
				myvalues = virtuals_dict[k]
				for x in myvalues:
					myatom = x
					if x.startswith("-"):
						# allow incrementals
						myatom = x[1:]
					if not isvalidatom(myatom):
						writemsg("--- Invalid atom in %s: %s\n" % \
							(virtuals_file, x), noiselevel=-1)
						myvalues.remove(x)
				if not myvalues:
					del virtuals_dict[k]
			if virtuals_dict:
				virtuals_list.append(virtuals_dict)

		self.dirVirtuals = stack_dictlist(virtuals_list, incremental=True)
		del virtuals_list

		for virt in self.dirVirtuals:
			# Preference for virtuals decreases from left to right.
			self.dirVirtuals[virt].reverse()

		# Repoman does not use user or tree virtuals.
		if self.local_config and not self.treeVirtuals:
			temp_vartree = vartree(myroot, None,
				categories=self.categories, settings=self)
			# Reduce the provides into a list by CP.
			self.treeVirtuals = map_dictlist_vals(getCPFromCPV,temp_vartree.get_all_provides())

		self.virtuals = self.__getvirtuals_compile()
		return self.virtuals

	def __getvirtuals_compile(self):
		"""Stack installed and profile virtuals.  Preference for virtuals
		decreases from left to right.
		Order of preference:
		1. installed and in profile
		2. installed only
		3. profile only
		"""

		# Virtuals by profile+tree preferences.
		ptVirtuals   = {}

		for virt, installed_list in self.treeVirtuals.iteritems():
			profile_list = self.dirVirtuals.get(virt, None)
			if not profile_list:
				continue
			for cp in installed_list:
				if cp in profile_list:
					ptVirtuals.setdefault(virt, [])
					ptVirtuals[virt].append(cp)

		virtuals = stack_dictlist([ptVirtuals, self.treeVirtuals,
			self.dirVirtuals])
		return virtuals

	def __delitem__(self,mykey):
		self.modifying()
		for x in self.lookuplist:
			if x != None:
				if mykey in x:
					del x[mykey]

	def __getitem__(self,mykey):
		match = ''
		for x in self.lookuplist:
			if x is None:
				writemsg("!!! lookuplist is null.\n")
			elif x.has_key(mykey):
				match = x[mykey]
				break
		return match

	def has_key(self,mykey):
		for x in self.lookuplist:
			if x.has_key(mykey):
				return 1
		return 0

	def __contains__(self, mykey):
		"""Called to implement membership test operators (in and not in)."""
		return bool(self.has_key(mykey))

	def setdefault(self, k, x=None):
		if k in self:
			return self[k]
		else:
			self[k] = x
			return x

	def get(self, k, x=None):
		if k in self:
			return self[k]
		else:
			return x

	def keys(self):
		return unique_array(flatten([x.keys() for x in self.lookuplist]))

	def __setitem__(self,mykey,myvalue):
		"set a value; will be thrown away at reset() time"
		if type(myvalue) != types.StringType:
			raise ValueError("Invalid type being used as a value: '%s': '%s'" % (str(mykey),str(myvalue)))
		self.modifying()
		self.modifiedkeys += [mykey]
		self.configdict["env"][mykey]=myvalue

	def environ(self):
		"return our locally-maintained environment"
		mydict={}
		for x in self.keys():
			myvalue = self[x]
			if not isinstance(myvalue, basestring):
				writemsg("!!! Non-string value in config: %s=%s\n" % \
					(x, myvalue), noiselevel=-1)
				continue
			mydict[x] = myvalue
		if not mydict.has_key("HOME") and mydict.has_key("BUILD_PREFIX"):
			writemsg("*** HOME not set. Setting to "+mydict["BUILD_PREFIX"]+"\n")
			mydict["HOME"]=mydict["BUILD_PREFIX"][:]

		return mydict

	def thirdpartymirrors(self):
		if getattr(self, "_thirdpartymirrors", None) is None:
			profileroots = [os.path.join(self["PORTDIR"], "profiles")]
			for x in self["PORTDIR_OVERLAY"].split():
				profileroots.insert(0, os.path.join(x, "profiles"))
			thirdparty_lists = [grabdict(os.path.join(x, "thirdpartymirrors")) for x in profileroots]
			self._thirdpartymirrors = stack_dictlist(thirdparty_lists, incremental=True)
		return self._thirdpartymirrors

	def archlist(self):
		return flatten([[myarch, "~" + myarch] \
			for myarch in self["PORTAGE_ARCHLIST"].split()])

	def selinux_enabled(self):
		if getattr(self, "_selinux_enabled", None) is None:
			self._selinux_enabled = 0
			if "selinux" in self["USE"].split():
				if "selinux" in globals():
					if selinux.is_selinux_enabled() == 1:
						self._selinux_enabled = 1
					else:
						self._selinux_enabled = 0
				else:
					writemsg("!!! SELinux module not found. Please verify that it was installed.\n",
						noiselevel=-1)
					self._selinux_enabled = 0
			if self._selinux_enabled == 0:
				try:	
					del sys.modules["selinux"]
				except KeyError:
					pass
		return self._selinux_enabled

# XXX This would be to replace getstatusoutput completely.
# XXX Issue: cannot block execution. Deadlock condition.
def spawn(mystring, mysettings, debug=0, free=0, droppriv=0, sesandbox=0, **keywords):
	"""
	Spawn a subprocess with extra portage-specific options.
	Optiosn include:

	Sandbox: Sandbox means the spawned process will be limited in its ability t
	read and write files (normally this means it is restricted to ${IMAGE}/)
	SElinux Sandbox: Enables sandboxing on SElinux
	Reduced Privileges: Drops privilages such that the process runs as portage:portage
	instead of as root.

	Notes: os.system cannot be used because it messes with signal handling.  Instead we
	use the portage_exec spawn* family of functions.

	This function waits for the process to terminate.

	@param mystring: Command to run
	@type mystring: String
	@param mysettings: Either a Dict of Key,Value pairs or an instance of portage.config
	@type mysettings: Dictionary or config instance
	@param debug: Ignored
	@type debug: Boolean
	@param free: Enable sandboxing for this process
	@type free: Boolean
	@param droppriv: Drop to portage:portage when running this command
	@type droppriv: Boolean
	@param sesandbox: Enable SELinux Sandboxing (toggles a context switch)
	@type sesandbox: Boolean
	@param keywords: Extra options encoded as a dict, to be passed to spawn
	@type keywords: Dictionary
	@rtype: Integer
	@returns:
	1. The return code of the spawned process.
	"""

	if type(mysettings) == types.DictType:
		env=mysettings
		keywords["opt_name"]="[ %s ]" % "portage"
	else:
		check_config_instance(mysettings)
		env=mysettings.environ()
		keywords["opt_name"]="[%s]" % mysettings["PF"]

	features = mysettings.features
	# XXX: Negative RESTRICT word
	droppriv=(droppriv and ("userpriv" in features) and not \
		(("nouserpriv" in mysettings["RESTRICT"].split()) or \
		 ("userpriv" in mysettings["RESTRICT"].split())))

	if droppriv and not uid and portage_gid and portage_uid:
		keywords.update({"uid":portage_uid,"gid":portage_gid,"groups":userpriv_groups,"umask":002})

	if not free:
		free=((droppriv and "usersandbox" not in features) or \
			(not droppriv and "sandbox" not in features and "usersandbox" not in features))

	if free:
		keywords["opt_name"] += " bash"
		spawn_func = portage_exec.spawn_bash
	else:
		keywords["opt_name"] += " sandbox"
		spawn_func = portage_exec.spawn_sandbox

	if sesandbox:
		con = selinux.getcontext()
		con = con.replace(mysettings["PORTAGE_T"], mysettings["PORTAGE_SANDBOX_T"])
		selinux.setexec(con)

	retval = spawn_func(mystring, env=env, **keywords)

	if sesandbox:
		selinux.setexec(None)

	return retval

def fetch(myuris, mysettings, listonly=0, fetchonly=0, locks_in_subdir=".locks",use_locks=1, try_mirrors=1):
	"fetch files.  Will use digest file if available."

	features = mysettings.features
	# 'nomirror' is bad/negative logic. You Restrict mirroring, not no-mirroring.
	if ("mirror" in mysettings["RESTRICT"].split()) or \
	   ("nomirror" in mysettings["RESTRICT"].split()):
		if ("mirror" in features) and ("lmirror" not in features):
			# lmirror should allow you to bypass mirror restrictions.
			# XXX: This is not a good thing, and is temporary at best.
			print ">>> \"mirror\" mode desired and \"mirror\" restriction found; skipping fetch."
			return 1

	thirdpartymirrors = mysettings.thirdpartymirrors()

	check_config_instance(mysettings)

	custommirrors = grabdict(os.path.join(mysettings["PORTAGE_CONFIGROOT"],
		CUSTOM_MIRRORS_FILE.lstrip(os.path.sep)), recursive=1)

	mymirrors=[]

	if listonly or ("distlocks" not in features):
		use_locks = 0

	fetch_to_ro = 0
	if "skiprocheck" in features:
		fetch_to_ro = 1

	if not os.access(mysettings["DISTDIR"],os.W_OK) and fetch_to_ro:
		if use_locks:
			writemsg(red("!!! For fetching to a read-only filesystem, " + \
				"locking should be turned off.\n"), noiselevel=-1)
			writemsg("!!! This can be done by adding -distlocks to " + \
				"FEATURES in /etc/make.conf\n", noiselevel=-1)
#			use_locks = 0

	# local mirrors are always added
	if custommirrors.has_key("local"):
		mymirrors += custommirrors["local"]

	if ("nomirror" in mysettings["RESTRICT"].split()) or \
	   ("mirror"   in mysettings["RESTRICT"].split()):
		# We don't add any mirrors.
		pass
	else:
		if try_mirrors:
			mymirrors += [x.rstrip("/") for x in mysettings["GENTOO_MIRRORS"].split() if x]

	mydigests = Manifest(
		mysettings["O"], mysettings["DISTDIR"]).getTypeDigests("DIST")

	fsmirrors = []
	for x in range(len(mymirrors)-1,-1,-1):
		if mymirrors[x] and mymirrors[x][0]=='/':
			fsmirrors += [mymirrors[x]]
			del mymirrors[x]

	restrict_fetch = "fetch" in mysettings["RESTRICT"].split()
	custom_local_mirrors = custommirrors.get("local", [])
	if restrict_fetch:
		# With fetch restriction, a normal uri may only be fetched from
		# custom local mirrors (if available).  A mirror:// uri may also
		# be fetched from specific mirrors (effectively overriding fetch
		# restriction, but only for specific mirrors).
		locations = custom_local_mirrors
	else:
		locations = mymirrors

	filedict={}
	primaryuri_indexes={}
	for myuri in myuris:
		myfile=os.path.basename(myuri)
		if not filedict.has_key(myfile):
			filedict[myfile]=[]
			for y in range(0,len(locations)):
				filedict[myfile].append(locations[y]+"/distfiles/"+myfile)
		if myuri[:9]=="mirror://":
			eidx = myuri.find("/", 9)
			if eidx != -1:
				mirrorname = myuri[9:eidx]

				# Try user-defined mirrors first
				if custommirrors.has_key(mirrorname):
					for cmirr in custommirrors[mirrorname]:
						filedict[myfile].append(cmirr+"/"+myuri[eidx+1:])
						# remove the mirrors we tried from the list of official mirrors
						if cmirr.strip() in thirdpartymirrors[mirrorname]:
							thirdpartymirrors[mirrorname].remove(cmirr)
				# now try the official mirrors
				if thirdpartymirrors.has_key(mirrorname):
					shuffle(thirdpartymirrors[mirrorname])

					for locmirr in thirdpartymirrors[mirrorname]:
						filedict[myfile].append(locmirr+"/"+myuri[eidx+1:])

				if not filedict[myfile]:
					writemsg("No known mirror by the name: %s\n" % (mirrorname))
			else:
				writemsg("Invalid mirror definition in SRC_URI:\n", noiselevel=-1)
				writemsg("  %s\n" % (myuri), noiselevel=-1)
		else:
			if restrict_fetch:
				# Only fetch from specific mirrors is allowed.
				continue
			if "primaryuri" in mysettings["RESTRICT"].split():
				# Use the source site first.
				if primaryuri_indexes.has_key(myfile):
					primaryuri_indexes[myfile] += 1
				else:
					primaryuri_indexes[myfile] = 0
				filedict[myfile].insert(primaryuri_indexes[myfile], myuri)
			else:
				filedict[myfile].append(myuri)

	can_fetch=True

	if listonly:
		can_fetch = False

	for var_name in ("FETCHCOMMAND", "RESUMECOMMAND"):
		if not mysettings.get(var_name, None):
			can_fetch = False

	if can_fetch:
		dirmode  = 02070
		filemode =   060
		modemask =    02
		distdir_dirs = [""]
		if "distlocks" in features:
			distdir_dirs.append(".locks")
		try:
			
			for x in distdir_dirs:
				mydir = os.path.join(mysettings["DISTDIR"], x)
				if portage_util.ensure_dirs(mydir, gid=portage_gid, mode=dirmode, mask=modemask):
					writemsg("Adjusting permissions recursively: '%s'\n" % mydir,
						noiselevel=-1)
					def onerror(e):
						raise # bail out on the first error that occurs during recursion
					if not apply_recursive_permissions(mydir,
						gid=portage_gid, dirmode=dirmode, dirmask=modemask,
						filemode=filemode, filemask=modemask, onerror=onerror):
						raise portage_exception.OperationNotPermitted(
							"Failed to apply recursive permissions for the portage group.")
		except portage_exception.PortageException, e:
			if not os.path.isdir(mysettings["DISTDIR"]):
				writemsg("!!! %s\n" % str(e), noiselevel=-1)
				writemsg("!!! Directory Not Found: DISTDIR='%s'\n" % mysettings["DISTDIR"], noiselevel=-1)
				writemsg("!!! Fetching will fail!\n", noiselevel=-1)

	if can_fetch and \
		not fetch_to_ro and \
		not os.access(mysettings["DISTDIR"], os.W_OK):
		writemsg("!!! No write access to '%s'\n" % mysettings["DISTDIR"],
			noiselevel=-1)
		can_fetch = False

	if can_fetch and use_locks and locks_in_subdir:
			distlocks_subdir = os.path.join(mysettings["DISTDIR"], locks_in_subdir)
			if not os.access(distlocks_subdir, os.W_OK):
				writemsg("!!! No write access to write to %s.  Aborting.\n" % distlocks_subdir,
					noiselevel=-1)
				return 0
			del distlocks_subdir
	for myfile in filedict.keys():
		"""
		fetched  status
		0        nonexistent
		1        partially downloaded
		2        completely downloaded
		"""
		myfile_path = os.path.join(mysettings["DISTDIR"], myfile)
		fetched=0
		file_lock = None
		if listonly:
			writemsg_stdout("\n", noiselevel=-1)
		else:
			if use_locks and can_fetch:
				if locks_in_subdir:
					file_lock = portage_locks.lockfile(mysettings["DISTDIR"]+"/"+locks_in_subdir+"/"+myfile,wantnewlockfile=1)
				else:
					file_lock = portage_locks.lockfile(mysettings["DISTDIR"]+"/"+myfile,wantnewlockfile=1)
		try:
			if not listonly:
				if fsmirrors and not os.path.exists(myfile_path):
					for mydir in fsmirrors:
						mirror_file = os.path.join(mydir, myfile)
						try:
							shutil.copyfile(mirror_file, myfile_path)
							writemsg(_("Local mirror has file:" + \
								" %(file)s\n" % {"file":myfile}))
							break
						except (IOError, OSError), e:
							if e.errno != errno.ENOENT:
								raise
							del e

				try:
					mystat = os.stat(myfile_path)
				except OSError, e:
					if e.errno != errno.ENOENT:
						raise
					del e
				else:
					try:
						apply_secpass_permissions(
							myfile_path, gid=portage_gid, mode=0664, mask=02,
							stat_cached=mystat)
					except portage_exception.PortageException, e:
						if not os.access(myfile_path, os.R_OK):
							writemsg("!!! Failed to adjust permissions:" + \
								" %s\n" % str(e), noiselevel=-1)
					if myfile not in mydigests:
						# We don't have a digest, but the file exists.  We must
						# assume that it is fully downloaded.
						continue
					else:
						if mystat.st_size < mydigests[myfile]["size"] and \
							not restrict_fetch:
							fetched = 1 # Try to resume this download.
						else:
							verified_ok, reason = portage_checksum.verify_all(
								myfile_path, mydigests[myfile])
							if not verified_ok:
								writemsg("!!! Previously fetched" + \
									" file: '%s'\n" % myfile, noiselevel=-1)
								writemsg("!!! Reason: %s\n" % reason[0],
									noiselevel=-1)
								writemsg(("!!! Got:      %s\n" + \
									"!!! Expected: %s\n") % \
									(reason[1], reason[2]), noiselevel=-1)
								if can_fetch and not restrict_fetch:
									writemsg("Refetching...\n\n",
										noiselevel=-1)
									os.unlink(myfile_path)
							else:
								eout = output.EOutput()
								eout.quiet = \
									mysettings.get("PORTAGE_QUIET", None) == "1"
								for digest_name in mydigests[myfile]:
									eout.ebegin(
										"%s %s ;-)" % (myfile, digest_name))
									eout.eend(0)
								continue # fetch any remaining files

			for loc in filedict[myfile]:
				if listonly:
					writemsg_stdout(loc+" ", noiselevel=-1)
					continue
				# allow different fetchcommands per protocol
				protocol = loc[0:loc.find("://")]
				if mysettings.has_key("FETCHCOMMAND_"+protocol.upper()):
					fetchcommand=mysettings["FETCHCOMMAND_"+protocol.upper()]
				else:
					fetchcommand=mysettings["FETCHCOMMAND"]
				if mysettings.has_key("RESUMECOMMAND_"+protocol.upper()):
					resumecommand=mysettings["RESUMECOMMAND_"+protocol.upper()]
				else:
					resumecommand=mysettings["RESUMECOMMAND"]

				fetchcommand=fetchcommand.replace("${DISTDIR}",mysettings["DISTDIR"])
				resumecommand=resumecommand.replace("${DISTDIR}",mysettings["DISTDIR"])

				if not can_fetch:
					if fetched != 2:
						if fetched == 0:
							writemsg("!!! File %s isn't fetched but unable to get it.\n" % myfile,
								noiselevel=-1)
						else:
							writemsg("!!! File %s isn't fully fetched, but unable to complete it\n" % myfile,
								noiselevel=-1)
						for var_name in ("FETCHCOMMAND", "RESUMECOMMAND"):
							if not mysettings.get(var_name, None):
								writemsg(("!!! %s is unset.  It should " + \
								"have been defined in /etc/make.globals.\n") \
								 % var_name, noiselevel=-1)
						return 0
					else:
						continue

				if fetched != 2:
					#we either need to resume or start the download
					#you can't use "continue" when you're inside a "try" block
					if fetched==1:
						#resume mode:
						writemsg(">>> Resuming download...\n")
						locfetch=resumecommand
					else:
						#normal mode:
						locfetch=fetchcommand
					writemsg_stdout(">>> Downloading '%s'\n" % \
						re.sub(r'//(.+):.+@(.+)/',r'//\1:*password*@\2/', loc))
					myfetch=locfetch.replace("${URI}",loc)
					myfetch=myfetch.replace("${FILE}",myfile)

					spawn_keywords = {}
					if "userfetch" in mysettings.features and \
						os.getuid() == 0 and portage_gid and portage_uid:
						spawn_keywords.update({
							"uid"    : portage_uid,
							"gid"    : portage_gid,
							"groups" : userpriv_groups,
							"umask"  : 002})

					try:

						if mysettings.selinux_enabled():
							con = selinux.getcontext()
							con = con.replace(mysettings["PORTAGE_T"], mysettings["PORTAGE_FETCH_T"])
							selinux.setexec(con)

						myret = portage_exec.spawn_bash(myfetch,
							env=mysettings.environ(), **spawn_keywords)

						if mysettings.selinux_enabled():
							selinux.setexec(None)

					finally:
						try:
							apply_secpass_permissions(myfile_path,
								gid=portage_gid, mode=0664, mask=02)
						except portage_exception.FileNotFound, e:
							pass
						except portage_exception.PortageException, e:
							if not os.access(myfile_path, os.R_OK):
								writemsg("!!! Failed to adjust permissions:" + \
									" %s\n" % str(e), noiselevel=-1)

					if mydigests!=None and mydigests.has_key(myfile):
						try:
							mystat = os.stat(myfile_path)
						except OSError, e:
							if e.errno != errno.ENOENT:
								raise
							del e
							fetched = 0
						else:
							# no exception?  file exists. let digestcheck() report
							# an appropriately for size or checksum errors
							if (mystat[stat.ST_SIZE]<mydigests[myfile]["size"]):
								# Fetch failed... Try the next one... Kill 404 files though.
								if (mystat[stat.ST_SIZE]<100000) and (len(myfile)>4) and not ((myfile[-5:]==".html") or (myfile[-4:]==".htm")):
									html404=re.compile("<title>.*(not found|404).*</title>",re.I|re.M)
									if html404.search(open(mysettings["DISTDIR"]+"/"+myfile).read()):
										try:
											os.unlink(mysettings["DISTDIR"]+"/"+myfile)
											writemsg(">>> Deleting invalid distfile. (Improper 404 redirect from server.)\n")
											fetched = 0
											continue
										except (IOError, OSError):
											pass
								fetched = 1
								continue
							if not fetchonly:
								fetched=2
								break
							else:
								# File is the correct size--check the checksums for the fetched
								# file NOW, for those users who don't have a stable/continuous
								# net connection. This way we have a chance to try to download
								# from another mirror...
								verified_ok,reason = portage_checksum.verify_all(mysettings["DISTDIR"]+"/"+myfile, mydigests[myfile])
								if not verified_ok:
									print reason
									writemsg("!!! Fetched file: "+str(myfile)+" VERIFY FAILED!\n",
										noiselevel=-1)
									writemsg("!!! Reason: "+reason[0]+"\n",
										noiselevel=-1)
									writemsg("!!! Got:      %s\n!!! Expected: %s\n" % \
										(reason[1], reason[2]), noiselevel=-1)
									writemsg("Removing corrupt distfile...\n", noiselevel=-1)
									os.unlink(mysettings["DISTDIR"]+"/"+myfile)
									fetched=0
								else:
									eout = output.EOutput()
									eout.quiet = mysettings.get("PORTAGE_QUIET", None) == "1"
									for x_key in mydigests[myfile].keys():
										eout.ebegin("%s %s ;-)" % (myfile, x_key))
										eout.eend(0)
									fetched=2
									break
					else:
						if not myret:
							fetched=2
							break
						elif mydigests!=None:
							writemsg("No digest file available and download failed.\n\n",
								noiselevel=-1)
		finally:
			if use_locks and file_lock:
				portage_locks.unlockfile(file_lock)

		if listonly:
			writemsg_stdout("\n", noiselevel=-1)
		if fetched != 2:
			if restrict_fetch:
				print "\n!!!", mysettings["CATEGORY"] + "/" + \
					mysettings["PF"], "has fetch restriction turned on."
				print "!!! This probably means that this " + \
					"ebuild's files must be downloaded"
				print "!!! manually.  See the comments in" + \
					" the ebuild for more information.\n"
				spawn(EBUILD_SH_BINARY + " nofetch", mysettings)
			elif listonly:
				continue
			elif not filedict[myfile]:
				writemsg("Warning: No mirrors available for file" + \
					" '%s'\n" % (myfile), noiselevel=-1)
			else:
				writemsg("!!! Couldn't download '%s'. Aborting.\n" % myfile,
					noiselevel=-1)
			return 0
	return 1

def digestgen(myarchives, mysettings, overwrite=1, manifestonly=0, myportdb=None):
	"""
	Generates a digest file if missing.  Assumes all files are available.
	DEPRECATED: this now only is a compability wrapper for 
	            portage_manifest.Manifest()
	NOTE: manifestonly and overwrite are useless with manifest2 and
	      are therefore ignored."""
	if myportdb is None:
		writemsg("Warning: myportdb not specified to digestgen\n")
		global portdb
		myportdb = portdb
	global _doebuild_manifest_exempt_depend
	try:
		_doebuild_manifest_exempt_depend += 1
		distfiles_map = {}
		fetchlist_dict = FetchlistDict(mysettings["O"], mysettings, myportdb)
		for cpv, fetchlist in fetchlist_dict.iteritems():
			for myfile in fetchlist:
				distfiles_map.setdefault(myfile, []).append(cpv)
		mf = Manifest(mysettings["O"], mysettings["DISTDIR"],
			fetchlist_dict=fetchlist_dict)
		required_hash_types = set(portage_const.MANIFEST1_HASH_FUNCTIONS)
		required_hash_types.update(portage_const.MANIFEST2_HASH_FUNCTIONS)
		required_hash_types.add("size")
		dist_hashes = mf.fhashdict.get("DIST", {})
		missing_hashes = set()
		for myfile in distfiles_map:
			myhashes = dist_hashes.get(myfile)
			if not myhashes:
				missing_hashes.add(myfile)
				continue
			if required_hash_types.difference(myhashes):
				missing_hashes.add(myfile)
		if missing_hashes:
			missing_files = []
			for myfile in missing_hashes:
				try:
					os.stat(os.path.join(mysettings["DISTDIR"], myfile))
				except OSError, e:
					if e.errno != errno.ENOENT:
						raise
					del e
					missing_files.append(myfile)
			if missing_files:
				mytree = os.path.realpath(os.path.dirname(
					os.path.dirname(mysettings["O"])))
				myuris = []
				for myfile in missing_files:
					for cpv in distfiles_map[myfile]:
						alluris, aalist = myportdb.getfetchlist(
							cpv, mytree=mytree, all=True,
							mysettings=mysettings)
						for uri in alluris:
							if os.path.basename(uri) == myfile:
								myuris.append(uri)
				if not fetch(myuris, mysettings):
					writemsg(("!!! File %s doesn't exist, can't update " + \
						"Manifest\n") % myfile, noiselevel=-1)
					return 0
		writemsg_stdout(">>> Creating Manifest for %s\n" % mysettings["O"])
		try:
			mf.create(requiredDistfiles=myarchives,
				assumeDistHashesSometimes=True,
				assumeDistHashesAlways=(
				"assume-digests" in mysettings.features))
		except portage_exception.FileNotFound, e:
			writemsg(("!!! File %s doesn't exist, can't update " + \
				"Manifest\n") % e, noiselevel=-1)
			return 0
		mf.write(sign=False)
		if "assume-digests" not in mysettings.features:
			distlist = mf.fhashdict.get("DIST", {}).keys()
			distlist.sort()
			auto_assumed = []
			for filename in distlist:
				if not os.path.exists(
					os.path.join(mysettings["DISTDIR"], filename)):
					auto_assumed.append(filename)
			if auto_assumed:
				mytree = os.path.realpath(
					os.path.dirname(os.path.dirname(mysettings["O"])))
				cp = os.path.sep.join(mysettings["O"].split(os.path.sep)[-2:])
				pkgs = myportdb.cp_list(cp, mytree=mytree)
				pkgs.sort()
				writemsg_stdout("  digest.assumed" + output.colorize("WARN",
					str(len(auto_assumed)).rjust(18)) + "\n")
				for pkg_key in pkgs:
					fetchlist = myportdb.getfetchlist(pkg_key,
						mysettings=mysettings, all=True, mytree=mytree)[1]
					pv = pkg_key.split("/")[1]
					for filename in auto_assumed:
						if filename in fetchlist:
							writemsg_stdout(
								"   digest-%s::%s\n" % (pv, filename))
		return 1
	finally:
		_doebuild_manifest_exempt_depend -= 1

def digestParseFile(myfilename, mysettings=None):
	"""(filename) -- Parses a given file for entries matching:
	<checksumkey> <checksum_hex_string> <filename> <filesize>
	Ignores lines that don't start with a valid checksum identifier
	and returns a dict with the filenames as keys and {checksumkey:checksum}
	as the values.
	DEPRECATED: this function is now only a compability wrapper for
	            portage_manifest.Manifest()."""

	mysplit = myfilename.split(os.sep)
	if mysplit[-2] == "files" and mysplit[-1].startswith("digest-"):
		pkgdir = os.sep + os.sep.join(mysplit[:-2]).strip(os.sep)
	elif mysplit[-1] == "Manifest":
		pkgdir = os.sep + os.sep.join(mysplit[:-1]).strip(os.sep)

	if mysettings is None:
		global settings
		mysettings = config(clone=settings)

	return Manifest(pkgdir, mysettings["DISTDIR"]).getDigests()

def digestcheck(myfiles, mysettings, strict=0, justmanifest=0):
	"""Verifies checksums.  Assumes all files have been downloaded.
	DEPRECATED: this is now only a compability wrapper for 
	            portage_manifest.Manifest()."""
	if not strict:
		return 1
	pkgdir = mysettings["O"]
	manifest_path = os.path.join(pkgdir, "Manifest")
	if not os.path.exists(manifest_path):
		writemsg("!!! Manifest file not found: '%s'\n" % manifest_path,
			noiselevel=-1)
		if strict:
			return 0
	mf = Manifest(pkgdir, mysettings["DISTDIR"])
	eout = output.EOutput()
	eout.quiet = mysettings.get("PORTAGE_QUIET", None) == "1"
	try:
		eout.ebegin("checking ebuild checksums ;-)")
		mf.checkTypeHashes("EBUILD")
		eout.eend(0)
		eout.ebegin("checking auxfile checksums ;-)")
		mf.checkTypeHashes("AUX")
		eout.eend(0)
		eout.ebegin("checking miscfile checksums ;-)")
		mf.checkTypeHashes("MISC", ignoreMissingFiles=True)
		eout.eend(0)
		for f in myfiles:
			eout.ebegin("checking %s ;-)" % f)
			mf.checkFileHashes(mf.findFile(f), f)
			eout.eend(0)
	except KeyError, e:
		eout.eend(1)
		writemsg("\n!!! Missing digest for %s\n" % str(e), noiselevel=-1)
		return 0
	except portage_exception.FileNotFound, e:
		eout.eend(1)
		writemsg("\n!!! A file listed in the Manifest could not be found: %s\n" % str(e),
			noiselevel=-1)
		return 0
	except portage_exception.DigestException, e:
		eout.eend(1)
		writemsg("\n!!! Digest verification failed:\n", noiselevel=-1)
		writemsg("!!! %s\n" % e.value[0], noiselevel=-1)
		writemsg("!!! Reason: %s\n" % e.value[1], noiselevel=-1)
		writemsg("!!! Got: %s\n" % e.value[2], noiselevel=-1)
		writemsg("!!! Expected: %s\n" % e.value[3], noiselevel=-1)
		return 0
	# Make sure that all of the ebuilds are actually listed in the Manifest.
	for f in os.listdir(pkgdir):
		if f.endswith(".ebuild") and not mf.hasFile("EBUILD", f):
			writemsg("!!! A file is not listed in the Manifest: '%s'\n" % \
				os.path.join(pkgdir, f), noiselevel=-1)
			return 0
	""" epatch will just grab all the patches out of a directory, so we have to
	make sure there aren't any foreign files that it might grab."""
	filesdir = os.path.join(pkgdir, "files")
	for parent, dirs, files in os.walk(filesdir):
		for d in dirs:
			if d.startswith(".") or d == "CVS":
				dirs.remove(d)
		for f in files:
			if f.startswith("."):
				continue
			f = os.path.join(parent, f)[len(filesdir) + 1:]
			file_type = mf.findFile(f)
			if file_type != "AUX" and not f.startswith("digest-"):
				writemsg("!!! A file is not listed in the Manifest: '%s'\n" % \
					os.path.join(filesdir, f), noiselevel=-1)
				return 0
	return 1

# parse actionmap to spawn ebuild with the appropriate args
def spawnebuild(mydo,actionmap,mysettings,debug,alwaysdep=0,logfile=None):
	if alwaysdep or "noauto" not in mysettings.features:
		# process dependency first
		if "dep" in actionmap[mydo].keys():
			retval=spawnebuild(actionmap[mydo]["dep"],actionmap,mysettings,debug,alwaysdep=alwaysdep,logfile=logfile)
			if retval:
				return retval
	kwargs = actionmap[mydo]["args"]
	mysettings["EBUILD_PHASE"] = mydo
	phase_retval = spawn(actionmap[mydo]["cmd"] % mydo, mysettings, debug=debug, logfile=logfile, **kwargs)
	mysettings["EBUILD_PHASE"] = ""

	if not kwargs["droppriv"] and secpass >= 2:
		""" Privileged phases may have left files that need to be made
		writable to a less privileged user."""
		apply_recursive_permissions(mysettings["T"],
			uid=portage_uid, gid=portage_gid, dirmode=070, dirmask=0,
			filemode=060, filemask=0)

	if phase_retval == os.EX_OK:
		if mydo == "install":
			# User and group bits that match the "portage" user or group are
			# automatically mapped to PORTAGE_INST_UID and PORTAGE_INST_GID if
			# necessary.  The chown system call may clear S_ISUID and S_ISGID
			# bits, so those bits are restored if necessary.
			inst_uid = int(mysettings["PORTAGE_INST_UID"])
			inst_gid = int(mysettings["PORTAGE_INST_GID"])
			for parent, dirs, files in os.walk(mysettings["D"]):
				for fname in chain(dirs, files):
					fpath = os.path.join(parent, fname)
					mystat = os.lstat(fpath)
					if mystat.st_uid != portage_uid and \
						mystat.st_gid != portage_gid:
						continue
					myuid = -1
					mygid = -1
					if mystat.st_uid == portage_uid:
						myuid = inst_uid
					if mystat.st_gid == portage_gid:
						mygid = inst_gid
					apply_secpass_permissions(fpath, uid=myuid, gid=mygid,
						mode=mystat.st_mode, stat_cached=mystat,
						follow_links=False)
			mycommand = " ".join([MISC_SH_BINARY, "install_qa_check", "install_symlink_html_docs"])
			qa_retval = spawn(mycommand, mysettings, debug=debug, logfile=logfile, **kwargs)
			if qa_retval:
				writemsg("!!! install_qa_check failed; exiting.\n",
					noiselevel=-1)
			return qa_retval
	return phase_retval


def eapi_is_supported(eapi):
	return str(eapi).strip() == str(portage_const.EAPI).strip()

def doebuild_environment(myebuild, mydo, myroot, mysettings, debug, use_cache, mydbapi):

	ebuild_path = os.path.abspath(myebuild)
	pkg_dir     = os.path.dirname(ebuild_path)

	if mysettings.configdict["pkg"].has_key("CATEGORY"):
		cat = mysettings.configdict["pkg"]["CATEGORY"]
	else:
		cat = os.path.basename(normalize_path(os.path.join(pkg_dir, "..")))
	mypv = os.path.basename(ebuild_path)[:-7]	
	mycpv = cat+"/"+mypv
	mysplit=pkgsplit(mypv,silent=0)
	if mysplit is None:
		raise portage_exception.IncorrectParameter(
			"Invalid ebuild path: '%s'" % myebuild)

	if mydo != "depend":
		"""For performance reasons, setcpv only triggers reset when it
		detects a package-specific change in config.  For the ebuild
		environment, a reset call is forced in order to ensure that the
		latest env.d variables are used."""
		mysettings.reset(use_cache=use_cache)
		mysettings.setcpv(mycpv, use_cache=use_cache, mydb=mydbapi)

	mysettings["EBUILD_PHASE"] = mydo

	mysettings["PORTAGE_MASTER_PID"] = str(os.getpid())

	# We are disabling user-specific bashrc files.
	mysettings["BASH_ENV"] = INVALID_ENV_FILE

	if debug: # Otherwise it overrides emerge's settings.
		# We have no other way to set debug... debug can't be passed in
		# due to how it's coded... Don't overwrite this so we can use it.
		mysettings["PORTAGE_DEBUG"] = "1"

	mysettings["ROOT"]     = myroot
	mysettings["STARTDIR"] = getcwd()

	mysettings["EBUILD"]   = ebuild_path
	mysettings["O"]        = pkg_dir
	mysettings.configdict["pkg"]["CATEGORY"] = cat
	mysettings["FILESDIR"] = pkg_dir+"/files"
	mysettings["PF"]       = mypv

	mysettings["ECLASSDIR"]   = mysettings["PORTDIR"]+"/eclass"
	mysettings["SANDBOX_LOG"] = mycpv.replace("/", "_-_")

	mysettings["PROFILE_PATHS"] = "\n".join(mysettings.profiles)+"\n"+CUSTOM_PROFILE_PATH
	mysettings["P"]  = mysplit[0]+"-"+mysplit[1]
	mysettings["PN"] = mysplit[0]
	mysettings["PV"] = mysplit[1]
	mysettings["PR"] = mysplit[2]

	if portage_util.noiselimit < 0:
		mysettings["PORTAGE_QUIET"] = "1"

	if mydo != "depend":
		eapi, mysettings["INHERITED"], mysettings["SLOT"], mysettings["RESTRICT"]  = \
			mydbapi.aux_get(mycpv, ["EAPI", "INHERITED", "SLOT", "RESTRICT"])
		if not eapi_is_supported(eapi):
			# can't do anything with this.
			raise portage_exception.UnsupportedAPIException(mycpv, eapi)
		mysettings["PORTAGE_RESTRICT"] = " ".join(flatten(
			portage_dep.use_reduce(portage_dep.paren_reduce(
			mysettings["RESTRICT"]), uselist=mysettings["USE"].split())))

	if mysplit[2] == "r0":
		mysettings["PVR"]=mysplit[1]
	else:
		mysettings["PVR"]=mysplit[1]+"-"+mysplit[2]

	if mysettings.has_key("PATH"):
		mysplit=mysettings["PATH"].split(":")
	else:
		mysplit=[]
	if PORTAGE_BIN_PATH not in mysplit:
		mysettings["PATH"]=PORTAGE_BIN_PATH+":"+mysettings["PATH"]

	# Sandbox needs cannonical paths.
	mysettings["PORTAGE_TMPDIR"] = os.path.realpath(
		mysettings["PORTAGE_TMPDIR"])
	mysettings["BUILD_PREFIX"] = mysettings["PORTAGE_TMPDIR"]+"/portage"
	mysettings["PKG_TMPDIR"]   = mysettings["PORTAGE_TMPDIR"]+"/binpkgs"
	
	# Package {pre,post}inst and {pre,post}rm may overlap, so they must have separate
	# locations in order to prevent interference.
	if mydo in ("unmerge", "prerm", "postrm", "cleanrm"):
		mysettings["PORTAGE_BUILDDIR"] = os.path.join(
			mysettings["PKG_TMPDIR"],
			mysettings["CATEGORY"], mysettings["PF"])
	else:
		mysettings["PORTAGE_BUILDDIR"] = os.path.join(
			mysettings["BUILD_PREFIX"],
			mysettings["CATEGORY"], mysettings["PF"])

	mysettings["HOME"] = os.path.join(mysettings["PORTAGE_BUILDDIR"], "homedir")
	mysettings["WORKDIR"] = os.path.join(mysettings["PORTAGE_BUILDDIR"], "work")
	mysettings["D"] = os.path.join(mysettings["PORTAGE_BUILDDIR"], "image") + os.sep
	mysettings["T"] = os.path.join(mysettings["PORTAGE_BUILDDIR"], "temp")

	mysettings["PORTAGE_BASHRC"] = os.path.join(
		mysettings["PORTAGE_CONFIGROOT"], EBUILD_SH_ENV_FILE.lstrip(os.path.sep))

	#set up KV variable -- DEP SPEEDUP :: Don't waste time. Keep var persistent.
	if (mydo!="depend") or not mysettings.has_key("KV"):
		mykv,err1=ExtractKernelVersion(os.path.join(myroot, "usr/src/linux"))
		if mykv:
			# Regular source tree
			mysettings["KV"]=mykv
		else:
			mysettings["KV"]=""

	if (mydo!="depend") or not mysettings.has_key("KVERS"):
		myso=os.uname()[2]
		mysettings["KVERS"]=myso[1]

	# Allow color.map to control colors associated with einfo, ewarn, etc...
	mycolors = []
	for c in ("GOOD", "WARN", "BAD", "HILITE", "BRACKET"):
		mycolors.append("%s=$'%s'" % (c, output.codes[c]))
	mysettings["PORTAGE_COLORMAP"] = "\n".join(mycolors)

def prepare_build_dirs(myroot, mysettings, cleanup):

	clean_dirs = [mysettings["HOME"]]

	# We enable cleanup when we want to make sure old cruft (such as the old
	# environment) doesn't interfere with the current phase.
	if cleanup:
		clean_dirs.append(mysettings["T"])

	for clean_dir in clean_dirs:
		try:
			shutil.rmtree(clean_dir)
		except OSError, oe:
			if errno.ENOENT == oe.errno:
				pass
			elif errno.EPERM == oe.errno:
				writemsg("%s\n" % oe, noiselevel=-1)
				writemsg("Operation Not Permitted: rmtree('%s')\n" % \
					clean_dir, noiselevel=-1)
				return 1
			else:
				raise

	def makedirs(dir_path):
		try:
			os.makedirs(dir_path)
		except OSError, oe:
			if errno.EEXIST == oe.errno:
				pass
			elif errno.EPERM == oe.errno:
				writemsg("%s\n" % oe, noiselevel=-1)
				writemsg("Operation Not Permitted: makedirs('%s')\n" % \
					dir_path, noiselevel=-1)
				return False
			else:
				raise
		return True

	mysettings["PKG_LOGDIR"] = os.path.join(mysettings["T"], "logging")

	mydirs = [os.path.dirname(mysettings["PORTAGE_BUILDDIR"])]
	mydirs.append(os.path.dirname(mydirs[-1]))

	try:
		for mydir in mydirs:
			portage_util.ensure_dirs(mydir)
			portage_util.apply_secpass_permissions(mydir,
				gid=portage_gid, uid=portage_uid, mode=070, mask=0)
		for dir_key in ("PORTAGE_BUILDDIR", "HOME", "PKG_LOGDIR", "T"):
			"""These directories don't necessarily need to be group writable.
			However, the setup phase is commonly run as a privileged user prior
			to the other phases being run by an unprivileged user.  Currently,
			we use the portage group to ensure that the unprivleged user still
			has write access to these directories in any case."""
			portage_util.ensure_dirs(mysettings[dir_key], mode=0775)
			portage_util.apply_secpass_permissions(mysettings[dir_key],
				uid=portage_uid, gid=portage_gid)
	except portage_exception.PermissionDenied, e:
		writemsg("Permission Denied: %s\n" % str(e), noiselevel=-1)
		return 1
	except portage_exception.OperationNotPermitted, e:
		writemsg("Operation Not Permitted: %s\n" % str(e), noiselevel=-1)
		return 1
	except portage_exception.FileNotFound, e:
		writemsg("File Not Found: '%s'\n" % str(e), noiselevel=-1)
		return 1

	features_dirs = {
		"ccache":{
			"basedir_var":"CCACHE_DIR",
			"default_dir":os.path.join(mysettings["PORTAGE_TMPDIR"], "ccache"),
			"always_recurse":False},
		"confcache":{
			"basedir_var":"CONFCACHE_DIR",
			"default_dir":os.path.join(mysettings["PORTAGE_TMPDIR"], "confcache"),
			"always_recurse":True},
		"distcc":{
			"basedir_var":"DISTCC_DIR",
			"default_dir":os.path.join(mysettings["BUILD_PREFIX"], ".distcc"),
			"subdirs":("lock", "state"),
			"always_recurse":True}
	}
	dirmode  = 02070
	filemode =   060
	modemask =    02
	for myfeature, kwargs in features_dirs.iteritems():
		if myfeature in mysettings.features:
			basedir = mysettings[kwargs["basedir_var"]]
			if basedir == "":
				basedir = kwargs["default_dir"]
				mysettings[kwargs["basedir_var"]] = basedir
			try:
				mydirs = [mysettings[kwargs["basedir_var"]]]
				if "subdirs" in kwargs:
					for subdir in kwargs["subdirs"]:
						mydirs.append(os.path.join(basedir, subdir))
				for mydir in mydirs:
					modified = portage_util.ensure_dirs(mydir,
						gid=portage_gid, mode=dirmode, mask=modemask)
					# To avoid excessive recursive stat calls, we trigger
					# recursion when the top level directory does not initially
					# match our permission requirements.
					if modified or kwargs["always_recurse"]:
						if modified:
							writemsg("Adjusting permissions recursively: '%s'\n" % mydir,
								noiselevel=-1)
						def onerror(e):
							raise	# The feature is disabled if a single error
									# occurs during permissions adjustment.
						if not apply_recursive_permissions(mydir,
						gid=portage_gid, dirmode=dirmode, dirmask=modemask,
						filemode=filemode, filemask=modemask, onerror=onerror):
							raise portage_exception.OperationNotPermitted(
								"Failed to apply recursive permissions for the portage group.")
			except portage_exception.PortageException, e:
				mysettings.features.remove(myfeature)
				mysettings["FEATURES"] = " ".join(mysettings.features)
				writemsg("!!! %s\n" % str(e), noiselevel=-1)
				writemsg("!!! Failed resetting perms on %s='%s'\n" % \
					(kwargs["basedir_var"], basedir), noiselevel=-1)
				writemsg("!!! Disabled FEATURES='%s'\n" % myfeature,
					noiselevel=-1)
				time.sleep(5)

	workdir_mode = 0700
	try:
		mode = mysettings["PORTAGE_WORKDIR_MODE"]
		if mode.isdigit():
			parsed_mode = int(mode, 8)
		elif mode == "":
			raise KeyError()
		else:
			raise ValueError()
		if parsed_mode & 07777 != parsed_mode:
			raise ValueError("Invalid file mode: %s" % mode)
		else:
			workdir_mode = parsed_mode
	except KeyError, e:
		writemsg("!!! PORTAGE_WORKDIR_MODE is unset, using %s.\n" % oct(workdir_mode))
	except ValueError, e:
		if len(str(e)) > 0:
			writemsg("%s\n" % e)
		writemsg("!!! Unable to parse PORTAGE_WORKDIR_MODE='%s', using %s.\n" % \
		(mysettings["PORTAGE_WORKDIR_MODE"], oct(workdir_mode)))
	mysettings["PORTAGE_WORKDIR_MODE"] = oct(workdir_mode)
	try:
		apply_secpass_permissions(mysettings["WORKDIR"],
		uid=portage_uid, gid=portage_gid, mode=workdir_mode)
	except portage_exception.FileNotFound:
		pass # ebuild.sh will create it

	if mysettings.get("PORT_LOGDIR", "") == "":
		while "PORT_LOGDIR" in mysettings:
			del mysettings["PORT_LOGDIR"]
	if "PORT_LOGDIR" in mysettings:
		try:
			portage_util.ensure_dirs(mysettings["PORT_LOGDIR"],
				uid=portage_uid, gid=portage_gid, mode=02770)
		except portage_exception.PortageException, e:
			writemsg("!!! %s\n" % str(e), noiselevel=-1)
			writemsg("!!! Permission issues with PORT_LOGDIR='%s'\n" % \
				mysettings["PORT_LOGDIR"], noiselevel=-1)
			writemsg("!!! Disabling logging.\n", noiselevel=-1)
			while "PORT_LOGDIR" in mysettings:
				del mysettings["PORT_LOGDIR"]
	if "PORT_LOGDIR" in mysettings:
		logid_path = os.path.join(mysettings["PORTAGE_BUILDDIR"], ".logid")
		if not os.path.exists(logid_path):
			f = open(logid_path, "w")
			f.close()
			del f
		logid_time = time.strftime("%Y%m%d-%H%M%S",
			time.gmtime(os.stat(logid_path).st_mtime))
		mysettings["PORTAGE_LOG_FILE"] = os.path.join(
			mysettings["PORT_LOGDIR"], "%s:%s:%s.log" % \
			(mysettings["CATEGORY"], mysettings["PF"], logid_time))
		del logid_path, logid_time
	else:
		mysettings["PORTAGE_LOG_FILE"] = os.path.join(mysettings["T"], "build.log")

_doebuild_manifest_exempt_depend = 0
_doebuild_manifest_checked = None

def doebuild(myebuild, mydo, myroot, mysettings, debug=0, listonly=0,
	fetchonly=0, cleanup=0, dbkey=None, use_cache=1, fetchall=0, tree=None,
	mydbapi=None, vartree=None, prev_mtimes=None):
	
	"""
	Wrapper function that invokes specific ebuild phases through the spawning
	of ebuild.sh
	
	@param myebuild: name of the ebuild to invoke the phase on (CPV)
	@type myebuild: String
	@param mydo: Phase to run
	@type mydo: String
	@param myroot: $ROOT (usually '/', see man make.conf)
	@type myroot: String
	@param mysettings: Portage Configuration
	@type mysettings: instance of portage.config
	@param debug: Turns on various debug information (eg, debug for spawn)
	@type debug: Boolean
	@param listonly: Used to wrap fetch(); passed such that fetch only lists files required.
	@type listonly: Boolean
	@param fetchonly: Used to wrap fetch(); passed such that files are only fetched (no other actions)
	@type fetchonly: Boolean
	@param cleanup: Passed to prepare_build_dirs (TODO: what does it do?)
	@type cleanup: Boolean
	@param dbkey: A dict (usually keys and values from the depend phase, such as KEYWORDS, USE, etc..)
	@type dbkey: Dict or String
	@param use_cache: Enables the cache
	@type use_cache: Boolean
	@param fetchall: Used to wrap fetch(), fetches all URI's (even ones invalid due to USE conditionals)
	@type fetchall: Boolean
	@param tree: Which tree to use ('vartree','porttree','bintree', etc..), defaults to 'porttree'
	@type tree: String
	@param mydbapi: a dbapi instance to pass to various functions; this should be a portdbapi instance.
	@type mydbapi: portdbapi instance
	@param vartree: A instance of vartree; used for aux_get calls, defaults to db[myroot]['vartree']
	@type vartree: vartree instance
	@param prev_mtimes: A dict of { filename:mtime } keys used by merge() to do config_protection
	@type prev_mtimes: dictionary
	@rtype: Boolean
	@returns:
	1. 0 for success
	2. 1 for error
	
	Most errors have an accompanying error message.
	
	listonly and fetchonly are only really necessary for operations involving 'fetch'
	prev_mtimes are only necessary for merge operations.
	Other variables may not be strictly required, many have defaults that are set inside of doebuild.
	
	"""
	
	if not tree:
		writemsg("Warning: tree not specified to doebuild\n")
		tree = "porttree"
	global db
	
	# chunked out deps for each phase, so that ebuild binary can use it 
	# to collapse targets down.
	actionmap_deps={
	"depend": [],
	"setup":  [],
	"unpack": ["setup"],
	"compile":["unpack"],
	"test":   ["compile"],
	"install":["test"],
	"rpm":    ["install"],
	"package":["install"],
	}
	
	if mydbapi is None:
		mydbapi = db[myroot][tree].dbapi

	if vartree is None and mydo in ("merge", "qmerge", "unmerge"):
		vartree = db[myroot]["vartree"]

	features = mysettings.features

	validcommands = ["help","clean","prerm","postrm","cleanrm","preinst","postinst",
	                "config","setup","depend","fetch","digest",
	                "unpack","compile","test","install","rpm","qmerge","merge",
	                "package","unmerge", "manifest"]

	if mydo not in validcommands:
		validcommands.sort()
		writemsg("!!! doebuild: '%s' is not one of the following valid commands:" % mydo,
			noiselevel=-1)
		for vcount in range(len(validcommands)):
			if vcount%6 == 0:
				writemsg("\n!!! ", noiselevel=-1)
			writemsg(validcommands[vcount].ljust(11), noiselevel=-1)
		writemsg("\n", noiselevel=-1)
		return 1

	if not os.path.exists(myebuild):
		writemsg("!!! doebuild: %s not found for %s\n" % (myebuild, mydo),
			noiselevel=-1)
		return 1

	global _doebuild_manifest_exempt_depend

	if "strict" in features and \
		"digest" not in features and \
		tree == "porttree" and \
		mydo not in ("digest", "manifest", "help") and \
		not _doebuild_manifest_exempt_depend:
		# Always verify the ebuild checksums before executing it.
		pkgdir = os.path.dirname(myebuild)
		manifest_path = os.path.join(pkgdir, "Manifest")
		global _doebuild_manifest_checked
		# Avoid checking the same Manifest several times in a row during a
		# regen with an empty cache.
		if _doebuild_manifest_checked != manifest_path:
			if not os.path.exists(manifest_path):
				writemsg("!!! Manifest file not found: '%s'\n" % manifest_path,
					noiselevel=-1)
				return 1
			mf = Manifest(pkgdir, mysettings["DISTDIR"])
			try:
				mf.checkTypeHashes("EBUILD")
			except portage_exception.FileNotFound, e:
				writemsg("!!! A file listed in the Manifest " + \
					"could not be found: %s\n" % str(e), noiselevel=-1)
				return 1
			except portage_exception.DigestException, e:
				writemsg("!!! Digest verification failed:\n", noiselevel=-1)
				writemsg("!!! %s\n" % e.value[0], noiselevel=-1)
				writemsg("!!! Reason: %s\n" % e.value[1], noiselevel=-1)
				writemsg("!!! Got: %s\n" % e.value[2], noiselevel=-1)
				writemsg("!!! Expected: %s\n" % e.value[3], noiselevel=-1)
				return 1
			# Make sure that all of the ebuilds are actually listed in the
			# Manifest.
			for f in os.listdir(pkgdir):
				if f.endswith(".ebuild") and not mf.hasFile("EBUILD", f):
					writemsg("!!! A file is not listed in the " + \
					"Manifest: '%s'\n" % os.path.join(pkgdir, f),
					noiselevel=-1)
					return 1
			_doebuild_manifest_checked = manifest_path

	logfile=None
	builddir_lock = None
	try:
		if mydo in ("digest", "manifest", "help"):
			# Temporarily exempt the depend phase from manifest checks, in case
			# aux_get calls trigger cache generation.
			_doebuild_manifest_exempt_depend += 1

		doebuild_environment(myebuild, mydo, myroot, mysettings, debug,
			use_cache, mydbapi)

		# get possible slot information from the deps file
		if mydo == "depend":
			writemsg("!!! DEBUG: dbkey: %s\n" % str(dbkey), 2)
			if isinstance(dbkey, dict):
				mysettings["dbkey"] = ""
				pr, pw = os.pipe()
				fd_pipes = {0:0, 1:1, 2:2, 9:pw}
				mypids = spawn(EBUILD_SH_BINARY + " depend", mysettings,
					fd_pipes=fd_pipes, returnpid=True)
				os.close(pw) # belongs exclusively to the child process now
				maxbytes = 1024
				mybytes = []
				while True:
					mybytes.append(os.read(pr, maxbytes))
					if not mybytes[-1]:
						break
				os.close(pr)
				mybytes = "".join(mybytes)
				global auxdbkeys
				for k, v in izip(auxdbkeys, mybytes.splitlines()):
					dbkey[k] = v
				retval = os.waitpid(mypids[0], 0)[1]
				portage_exec.spawned_pids.remove(mypids[0])
				# If it got a signal, return the signal that was sent, but
				# shift in order to distinguish it from a return value. (just
				# like portage_exec.spawn() would do).
				if retval & 0xff:
					return (retval & 0xff) << 8
				# Otherwise, return its exit code.
				return retval >> 8
			elif dbkey:
				mysettings["dbkey"] = dbkey
			else:
				mysettings["dbkey"] = \
					os.path.join(mysettings.depcachedir, "aux_db_key_temp")

			return spawn(EBUILD_SH_BINARY + " depend", mysettings)

		if "PORTAGE_TMPDIR" not in mysettings or \
			not os.path.isdir(mysettings["PORTAGE_TMPDIR"]):
			writemsg("The directory specified in your " + \
				"PORTAGE_TMPDIR variable, '%s',\n" % \
				mysettings.get("PORTAGE_TMPDIR", ""), noiselevel=-1)
			writemsg("does not exist.  Please create this directory or " + \
				"correct your PORTAGE_TMPDIR setting.\n", noiselevel=-1)
			return 1

		# Build directory creation isn't required for any of these.
		if mydo not in ("digest", "fetch", "help", "manifest"):
			mystatus = prepare_build_dirs(myroot, mysettings, cleanup)
			if mystatus:
				return mystatus
			# PORTAGE_LOG_FILE is set above by the prepare_build_dirs() call.
			logfile = mysettings.get("PORTAGE_LOG_FILE", None)
		if mydo == "unmerge":
			return unmerge(mysettings["CATEGORY"],
				mysettings["PF"], myroot, mysettings, vartree=vartree)

		# if any of these are being called, handle them -- running them out of
		# the sandbox -- and stop now.
		if mydo in ["clean","cleanrm"]:
			return spawn(EBUILD_SH_BINARY + " clean", mysettings,
				debug=debug, free=1, logfile=None)
		elif mydo == "help":
			return spawn(EBUILD_SH_BINARY + " " + mydo, mysettings,
				debug=debug, free=1, logfile=logfile)
		elif mydo == "setup":
			infodir = os.path.join(
				mysettings["PORTAGE_BUILDDIR"], "build-info")
			if os.path.isdir(infodir):
				"""Load USE flags for setup phase of a binary package.
				Ideally, the environment.bz2 would be used instead."""
				mysettings.load_infodir(infodir)
			retval = spawn(EBUILD_SH_BINARY + " " + mydo, mysettings,
				debug=debug, free=1, logfile=logfile)
			if secpass >= 2:
				""" Privileged phases may have left files that need to be made
				writable to a less privileged user."""
				apply_recursive_permissions(mysettings["T"],
					uid=portage_uid, gid=portage_gid, dirmode=070, dirmask=0,
					filemode=060, filemask=0)
			return retval
		elif mydo == "preinst":
			mysettings["IMAGE"] = mysettings["D"]
			phase_retval = spawn(" ".join((EBUILD_SH_BINARY, mydo)),
				mysettings, debug=debug, free=1, logfile=logfile)
			if phase_retval == os.EX_OK:
				# Post phase logic and tasks that have been factored out of
				# ebuild.sh.
				myargs = [MISC_SH_BINARY, "preinst_bsdflags", "preinst_mask",
					"preinst_sfperms", "preinst_selinux_labels",
					"preinst_suid_scan"]
				mysettings["EBUILD_PHASE"] = ""
				phase_retval = spawn(" ".join(myargs),
					mysettings, debug=debug, free=1, logfile=logfile)
				if phase_retval != os.EX_OK:
					writemsg("!!! post preinst failed; exiting.\n",
						noiselevel=-1)
			del mysettings["IMAGE"]
			return phase_retval
		elif mydo == "postinst":
			mysettings.load_infodir(mysettings["O"])
			phase_retval = spawn(" ".join((EBUILD_SH_BINARY, mydo)),
				mysettings, debug=debug, free=1, logfile=logfile)
			if phase_retval == os.EX_OK:
				# Post phase logic and tasks that have been factored out of
				# ebuild.sh.
				myargs = [MISC_SH_BINARY, "postinst_bsdflags"]
				mysettings["EBUILD_PHASE"] = ""
				phase_retval = spawn(" ".join(myargs),
					mysettings, debug=debug, free=1, logfile=logfile)
				if phase_retval != os.EX_OK:
					writemsg("!!! post postinst failed; exiting.\n",
						noiselevel=-1)
			return phase_retval
		elif mydo in ["prerm","postrm","config"]:
			mysettings.load_infodir(mysettings["O"])
			return spawn(EBUILD_SH_BINARY + " " + mydo,
				mysettings, debug=debug, free=1, logfile=logfile)

		mycpv = "/".join((mysettings["CATEGORY"], mysettings["PF"]))

		# Make sure we get the correct tree in case there are overlays.
		mytree = os.path.realpath(
			os.path.dirname(os.path.dirname(mysettings["O"])))
		newuris, alist = mydbapi.getfetchlist(
			mycpv, mytree=mytree, mysettings=mysettings)
		alluris, aalist = mydbapi.getfetchlist(
			mycpv, mytree=mytree, all=True, mysettings=mysettings)
		mysettings["A"] = " ".join(alist)
		mysettings["AA"] = " ".join(aalist)
		if ("mirror" in features) or fetchall:
			fetchme = alluris[:]
			checkme = aalist[:]
		elif mydo == "digest":
			fetchme = alluris[:]
			checkme = aalist[:]
			# Skip files that we already have digests for.
			mf = Manifest(mysettings["O"], mysettings["DISTDIR"])
			mydigests = mf.getTypeDigests("DIST")
			for filename, hashes in mydigests.iteritems():
				if len(hashes) == len(mf.hashes):
					checkme = [i for i in checkme if i != filename]
					fetchme = [i for i in fetchme \
						if os.path.basename(i) != filename]
				del filename, hashes
		else:
			fetchme = newuris[:]
			checkme = alist[:]

		# Only try and fetch the files if we are going to need them ...
		# otherwise, if user has FEATURES=noauto and they run `ebuild clean
		# unpack compile install`, we will try and fetch 4 times :/
		need_distfiles = (mydo in ("fetch", "unpack") or \
			mydo not in ("digest", "manifest") and "noauto" not in features)
		if need_distfiles and not fetch(
			fetchme, mysettings, listonly=listonly, fetchonly=fetchonly):
			return 1

		if mydo == "fetch" and listonly:
			return 0

		try:
			if mydo == "manifest":
				return not digestgen(aalist, mysettings, overwrite=1,
					manifestonly=1, myportdb=mydbapi)
			elif mydo == "digest":
				return not digestgen(aalist, mysettings, overwrite=1,
					myportdb=mydbapi)
			elif "digest" in mysettings.features:
				digestgen(aalist, mysettings, overwrite=0, myportdb=mydbapi)
		except portage_exception.PermissionDenied, e:
			writemsg("!!! %s\n" % str(e), noiselevel=-1)
			if mydo in ("digest", "manifest"):
				return 1

		# See above comment about fetching only when needed
		if not digestcheck(checkme, mysettings, ("strict" in features),
			(mydo not in ["digest","fetch","unpack"] and \
			mysettings.get("PORTAGE_CALLER", None) == "ebuild" and \
			"noauto" in features)):
			return 1

		if mydo == "fetch":
			return 0

		# remove PORTAGE_ACTUAL_DISTDIR once cvs/svn is supported via SRC_URI
		if (mydo != "setup" and "noauto" not in features) or mydo == "unpack":
			orig_distdir = mysettings["DISTDIR"]
			mysettings["PORTAGE_ACTUAL_DISTDIR"] = orig_distdir
			edpath = mysettings["DISTDIR"] = \
				os.path.join(mysettings["PORTAGE_BUILDDIR"], "distdir")
			if os.path.exists(edpath):
				try:
					if os.path.isdir(edpath) and not os.path.islink(edpath):
						shutil.rmtree(edpath)
					else:
						os.unlink(edpath)
				except OSError:
					print "!!! Failed reseting ebuild distdir path, " + edpath
					raise
			os.mkdir(edpath)
			apply_secpass_permissions(edpath, uid=portage_uid, mode=0755)
			try:
				for file in aalist:
					os.symlink(os.path.join(orig_distdir, file),
						os.path.join(edpath, file))
			except OSError:
				print "!!! Failed symlinking in '%s' to ebuild distdir" % file
				raise

		#initial dep checks complete; time to process main commands

		nosandbox = (("userpriv" in features) and \
			("usersandbox" not in features) and \
			("userpriv" not in mysettings["RESTRICT"]) and \
			("nouserpriv" not in mysettings["RESTRICT"]))
		if nosandbox and ("userpriv" not in features or \
			"userpriv" in mysettings["RESTRICT"] or \
			"nouserpriv" in mysettings["RESTRICT"]):
			nosandbox = ("sandbox" not in features and \
				"usersandbox" not in features)

		sesandbox = mysettings.selinux_enabled() and \
			"sesandbox" in mysettings.features
		ebuild_sh = EBUILD_SH_BINARY + " %s"
		misc_sh = MISC_SH_BINARY + " dyn_%s"

		# args are for the to spawn function
		actionmap = {
"depend": {"cmd":ebuild_sh, "args":{"droppriv":1, "free":0,         "sesandbox":0}},
"setup":  {"cmd":ebuild_sh, "args":{"droppriv":0, "free":1,         "sesandbox":0}},
"unpack": {"cmd":ebuild_sh, "args":{"droppriv":1, "free":0,         "sesandbox":sesandbox}},
"compile":{"cmd":ebuild_sh, "args":{"droppriv":1, "free":nosandbox, "sesandbox":sesandbox}},
"test":   {"cmd":ebuild_sh, "args":{"droppriv":1, "free":nosandbox, "sesandbox":sesandbox}},
"install":{"cmd":ebuild_sh, "args":{"droppriv":0, "free":0,         "sesandbox":sesandbox}},
"rpm":    {"cmd":misc_sh,   "args":{"droppriv":0, "free":0,         "sesandbox":0}},
"package":{"cmd":misc_sh,   "args":{"droppriv":0, "free":0,         "sesandbox":0}},
		}

		# merge the deps in so we have again a 'full' actionmap
		# be glad when this can die.
		for x in actionmap.keys():
			if len(actionmap_deps.get(x, [])):
				actionmap[x]["dep"] = ' '.join(actionmap_deps[x])

		if mydo in actionmap.keys():
			if mydo=="package":
				portage_util.ensure_dirs(
					os.path.join(mysettings["PKGDIR"], mysettings["CATEGORY"]))
				portage_util.ensure_dirs(
					os.path.join(mysettings["PKGDIR"], "All"))
			retval = spawnebuild(mydo,
				actionmap, mysettings, debug, logfile=logfile)
		elif mydo=="qmerge":
			# check to ensure install was run.  this *only* pops up when users
			# forget it and are using ebuild
			if not os.path.exists(
				os.path.join(mysettings["PORTAGE_BUILDDIR"], ".installed")):
				writemsg("!!! mydo=qmerge, but install phase hasn't been ran\n",
					noiselevel=-1)
				return 1
			# qmerge is a special phase that implies noclean.
			if "noclean" not in mysettings.features:
				mysettings.features.append("noclean")
			#qmerge is specifically not supposed to do a runtime dep check
			retval = merge(
				mysettings["CATEGORY"], mysettings["PF"], mysettings["D"],
				os.path.join(mysettings["PORTAGE_BUILDDIR"], "build-info"),
				myroot, mysettings, myebuild=mysettings["EBUILD"], mytree=tree,
				mydbapi=mydbapi, vartree=vartree, prev_mtimes=prev_mtimes)
		elif mydo=="merge":
			retval = spawnebuild("install", actionmap, mysettings, debug,
				alwaysdep=1, logfile=logfile)
			if retval == os.EX_OK:
				retval = merge(mysettings["CATEGORY"], mysettings["PF"],
					mysettings["D"], os.path.join(mysettings["PORTAGE_BUILDDIR"],
					"build-info"), myroot, mysettings,
					myebuild=mysettings["EBUILD"], mytree=tree, mydbapi=mydbapi,
					vartree=vartree, prev_mtimes=prev_mtimes)
		else:
			print "!!! Unknown mydo:",mydo
			return 1

		if retval != os.EX_OK and tree == "porttree":
			for i in xrange(len(mydbapi.porttrees)-1):
				t = mydbapi.porttrees[i+1]
				if myebuild.startswith(t):
					# Display the non-cannonical path, in case it's different, to
					# prevent confusion.
					overlays = mysettings["PORTDIR_OVERLAY"].split()
					try:
						writemsg("!!! This ebuild is from an overlay: '%s'\n" % \
							overlays[i], noiselevel=-1)
					except IndexError:
						pass
					break
		return retval

	finally:
		if builddir_lock:
			portage_locks.unlockdir(builddir_lock)

		# Make sure that DISTDIR is restored to it's normal value before we return!
		if "PORTAGE_ACTUAL_DISTDIR" in mysettings:
			mysettings["DISTDIR"] = mysettings["PORTAGE_ACTUAL_DISTDIR"]
			del mysettings["PORTAGE_ACTUAL_DISTDIR"]

		if logfile:
			try:
				if os.stat(logfile).st_size == 0:
					os.unlink(logfile)
			except OSError:
				pass

		if mydo in ("digest", "manifest", "help"):
			# If necessary, depend phase has been triggered by aux_get calls
			# and the exemption is no longer needed.
			_doebuild_manifest_exempt_depend -= 1

expandcache={}

def movefile(src,dest,newmtime=None,sstat=None,mysettings=None):
	"""moves a file from src to dest, preserving all permissions and attributes; mtime will
	be preserved even when moving across filesystems.  Returns true on success and false on
	failure.  Move is atomic."""
	#print "movefile("+str(src)+","+str(dest)+","+str(newmtime)+","+str(sstat)+")"
	global lchown
	if mysettings is None:
		global settings
		mysettings = settings
	selinux_enabled = mysettings.selinux_enabled()
	try:
		if not sstat:
			sstat=os.lstat(src)

	except SystemExit, e:
		raise
	except Exception, e:
		print "!!! Stating source file failed... movefile()"
		print "!!!",e
		return None

	destexists=1
	try:
		dstat=os.lstat(dest)
	except (OSError, IOError):
		dstat=os.lstat(os.path.dirname(dest))
		destexists=0

	if bsd_chflags:
		# Check that we can actually unset schg etc flags...
		# Clear the flags on source and destination; we'll reinstate them after merging
		if destexists and dstat.st_flags != 0:
			if bsd_chflags.lchflags(dest, 0) < 0:
				writemsg("!!! Couldn't clear flags on file being merged: \n ",
					noiselevel=-1)
		# We might have an immutable flag on the parent dir; save and clear.
		pflags=bsd_chflags.lgetflags(os.path.dirname(dest))
		if pflags != 0:
			bsd_chflags.lchflags(os.path.dirname(dest), 0)

		if (destexists and bsd_chflags.lhasproblems(dest) > 0) or \
			bsd_chflags.lhasproblems(os.path.dirname(dest)) > 0:
			# This is bad: we can't merge the file with these flags set.
			writemsg("!!! Can't merge file "+dest+" because of flags set\n",
				noiselevel=-1)
			return None

	if destexists:
		if stat.S_ISLNK(dstat[stat.ST_MODE]):
			try:
				os.unlink(dest)
				destexists=0
			except SystemExit, e:
				raise
			except Exception, e:
				pass

	if stat.S_ISLNK(sstat[stat.ST_MODE]):
		try:
			target=os.readlink(src)
			if mysettings and mysettings["D"]:
				if target.find(mysettings["D"])==0:
					target=target[len(mysettings["D"]):]
			if destexists and not stat.S_ISDIR(dstat[stat.ST_MODE]):
				os.unlink(dest)
			if selinux_enabled:
				sid = selinux.get_lsid(src)
				selinux.secure_symlink(target,dest,sid)
			else:
				os.symlink(target,dest)
			lchown(dest,sstat[stat.ST_UID],sstat[stat.ST_GID])
			return os.lstat(dest)[stat.ST_MTIME]
		except SystemExit, e:
			raise
		except Exception, e:
			print "!!! failed to properly create symlink:"
			print "!!!",dest,"->",target
			print "!!!",e
			return None

	renamefailed=1
	if sstat[stat.ST_DEV]==dstat[stat.ST_DEV] or selinux_enabled:
		try:
			if selinux_enabled:
				ret=selinux.secure_rename(src,dest)
			else:
				ret=os.rename(src,dest)
			renamefailed=0
		except SystemExit, e:
			raise
		except Exception, e:
			if e[0]!=errno.EXDEV:
				# Some random error.
				print "!!! Failed to move",src,"to",dest
				print "!!!",e
				return None
			# Invalid cross-device-link 'bind' mounted or actually Cross-Device
	if renamefailed:
		didcopy=0
		if stat.S_ISREG(sstat[stat.ST_MODE]):
			try: # For safety copy then move it over.
				if selinux_enabled:
					selinux.secure_copy(src,dest+"#new")
					selinux.secure_rename(dest+"#new",dest)
				else:
					shutil.copyfile(src,dest+"#new")
					os.rename(dest+"#new",dest)
				didcopy=1
			except SystemExit, e:
				raise
			except Exception, e:
				print '!!! copy',src,'->',dest,'failed.'
				print "!!!",e
				return None
		else:
			#we don't yet handle special, so we need to fall back to /bin/mv
			if selinux_enabled:
				a=commands.getstatusoutput(MOVE_BINARY+" -c -f "+"'"+src+"' '"+dest+"'")
			else:
				a=commands.getstatusoutput(MOVE_BINARY+" -f "+"'"+src+"' '"+dest+"'")
				if a[0]!=0:
					print "!!! Failed to move special file:"
					print "!!! '"+src+"' to '"+dest+"'"
					print "!!!",a
					return None # failure
		try:
			if didcopy:
				if stat.S_ISLNK(sstat[stat.ST_MODE]):
					lchown(dest,sstat[stat.ST_UID],sstat[stat.ST_GID])
				else:
					os.chown(dest,sstat[stat.ST_UID],sstat[stat.ST_GID])
				os.chmod(dest, stat.S_IMODE(sstat[stat.ST_MODE])) # Sticky is reset on chown
				os.unlink(src)
		except SystemExit, e:
			raise
		except Exception, e:
			print "!!! Failed to chown/chmod/unlink in movefile()"
			print "!!!",dest
			print "!!!",e
			return None

	if newmtime:
		os.utime(dest,(newmtime,newmtime))
	else:
		os.utime(dest, (sstat[stat.ST_ATIME], sstat[stat.ST_MTIME]))
		newmtime=sstat[stat.ST_MTIME]

	if bsd_chflags:
		# Restore the flags we saved before moving
		if pflags and bsd_chflags.lchflags(os.path.dirname(dest), pflags) < 0:
			writemsg("!!! Couldn't restore flags (%s) on '%s'\n" % \
				(str(pflags), os.path.dirname(dest)), noiselevel=-1)
			return None

	return newmtime

def merge(mycat, mypkg, pkgloc, infloc, myroot, mysettings, myebuild=None,
	mytree=None, mydbapi=None, vartree=None, prev_mtimes=None):
	if not os.access(myroot, os.W_OK):
		writemsg("Permission denied: access('%s', W_OK)\n" % myroot,
			noiselevel=-1)
		return errno.EACCES
	mylink = dblink(mycat, mypkg, myroot, mysettings, treetype=mytree,
		vartree=vartree)
	return mylink.merge(pkgloc, infloc, myroot, myebuild,
		mydbapi=mydbapi, prev_mtimes=prev_mtimes)

def unmerge(cat, pkg, myroot, mysettings, mytrimworld=1, vartree=None, ldpath_mtimes=None):
	mylink = dblink(
		cat, pkg, myroot, mysettings, treetype="vartree", vartree=vartree)
	try:
		mylink.lockdb()
		if mylink.exists():
			retval = mylink.unmerge(trimworld=mytrimworld, cleanup=1,
				ldpath_mtimes=ldpath_mtimes)
			if retval == os.EX_OK:
				mylink.delete()
			return retval
		return os.EX_OK
	finally:
		mylink.unlockdb()

def getCPFromCPV(mycpv):
	"""Calls pkgsplit on a cpv and returns only the cp."""
	return pkgsplit(mycpv)[0]

def dep_virtual(mysplit, mysettings):
	"Does virtual dependency conversion"
	newsplit=[]
	myvirtuals = mysettings.getvirtuals()
	for x in mysplit:
		if type(x)==types.ListType:
			newsplit.append(dep_virtual(x, mysettings))
		else:
			mykey=dep_getkey(x)
			mychoices = myvirtuals.get(mykey, None)
			if mychoices:
				if len(mychoices) == 1:
					a = x.replace(mykey, mychoices[0])
				else:
					if x[0]=="!":
						# blocker needs "and" not "or(||)".
						a=[]
					else:
						a=['||']
					for y in mychoices:
						a.append(x.replace(mykey, y))
				newsplit.append(a)
			else:
				newsplit.append(x)
	return newsplit

def _expand_new_virtuals(mysplit, edebug, mydbapi, mysettings, myroot="/",
	trees=None, **kwargs):
	"""Recursively expand new-style virtuals so as to collapse one or more
	levels of indirection.  In dep_zapdeps, new-style virtuals will be assigned
	zero cost regardless of whether or not they are currently installed. Virtual
	blockers are supported but only when the virtual expands to a single
	atom because it wouldn't necessarily make sense to block all the components
	of a compound virtual.  When more than one new-style virtual is matched,
	the matches are sorted from highest to lowest versions and the atom is
	expanded to || ( highest match ... lowest match )."""
	newsplit = []
	# According to GLEP 37, RDEPEND is the only dependency type that is valid
	# for new-style virtuals.  Repoman should enforce this.
	dep_keys = ["RDEPEND", "DEPEND", "PDEPEND"]
	def compare_pkgs(a, b):
		return pkgcmp(b[1], a[1])
	portdb = trees[myroot]["porttree"].dbapi
	if kwargs["use_binaries"]:
		portdb = trees[myroot]["bintree"].dbapi
	myvirtuals = mysettings.getvirtuals()
	for x in mysplit:
		if x == "||":
			newsplit.append(x)
			continue
		elif isinstance(x, list):
			newsplit.append(_expand_new_virtuals(x, edebug, mydbapi,
				mysettings, myroot=myroot, trees=trees, **kwargs))
			continue
		if portage_dep._dep_check_strict and \
			not isvalidatom(x, allow_blockers=True):
			raise portage_exception.ParseError(
				"invalid atom: '%s'" % x)
		mykey = dep_getkey(x)
		if not mykey.startswith("virtual/"):
			newsplit.append(x)
			continue
		mychoices = myvirtuals.get(mykey, [])
		isblocker = x.startswith("!")
		match_atom = x
		if isblocker:
			match_atom = x[1:]
		pkgs = {}
		for cpv in portdb.match(match_atom):
			# only use new-style matches
			if cpv.startswith("virtual/"):
				pkgs[cpv] = (cpv, pkgsplit(cpv), portdb)
		if kwargs["use_binaries"] and "vartree" in trees[myroot]:
			vardb = trees[myroot]["vartree"].dbapi
			for cpv in vardb.match(match_atom):
				# only use new-style matches
				if cpv.startswith("virtual/"):
					if cpv in pkgs:
						continue
					pkgs[cpv] = (cpv, pkgsplit(cpv), vardb)
		if not (pkgs or mychoices):
			# This one couldn't be expanded as a new-style virtual.  Old-style
			# virtuals have already been expanded by dep_virtual, so this one
			# is unavailable and dep_zapdeps will identify it as such.  The
			# atom is not eliminated here since it may still represent a
			# dependency that needs to be satisfied.
			newsplit.append(x)
			continue
		if not pkgs and len(mychoices) == 1:
			newsplit.append(x.replace(mykey, mychoices[0]))
			continue
		pkgs = pkgs.values()
		pkgs.sort(compare_pkgs) # Prefer higher versions.
		if isblocker:
			a = []
		else:
			a = ['||']
		for y in pkgs:
			depstring = " ".join(y[2].aux_get(y[0], dep_keys))
			if edebug:
				print "Virtual Parent:   ", y[0]
				print "Virtual Depstring:", depstring
			mycheck = dep_check(depstring, mydbapi, mysettings, myroot=myroot,
				trees=trees, **kwargs)
			if not mycheck[0]:
				raise portage_exception.ParseError(
					"%s: %s '%s'" % (y[0], mycheck[1], depstring))
			if isblocker:
				virtual_atoms = [atom for atom in mycheck[1] \
					if not atom.startswith("!")]
				if len(virtual_atoms) == 1:
					# It wouldn't make sense to block all the components of a
					# compound virtual, so only a single atom block is allowed.
					a.append("!" + virtual_atoms[0])
			else:
				mycheck[1].append("="+y[0]) # pull in the new-style virtual
				a.append(mycheck[1])
		# Plain old-style virtuals.  New-style virtuals are preferred.
		for y in mychoices:
			a.append(x.replace(mykey, y))
		if isblocker and not a:
			# Probably a compound virtual.  Pass the atom through unprocessed.
			newsplit.append(x)
			continue
		newsplit.append(a)
	return newsplit

def dep_eval(deplist):
	if not deplist:
		return 1
	if deplist[0]=="||":
		#or list; we just need one "1"
		for x in deplist[1:]:
			if type(x)==types.ListType:
				if dep_eval(x)==1:
					return 1
			elif x==1:
					return 1
		#XXX: unless there's no available atoms in the list
		#in which case we need to assume that everything is
		#okay as some ebuilds are relying on an old bug.
		if len(deplist) == 1:
			return 1
		return 0
	else:
		for x in deplist:
			if type(x)==types.ListType:
				if dep_eval(x)==0:
					return 0
			elif x==0 or x==2:
				return 0
		return 1

def dep_zapdeps(unreduced, reduced, myroot, use_binaries=0, trees=None):
	"""Takes an unreduced and reduced deplist and removes satisfied dependencies.
	Returned deplist contains steps that must be taken to satisfy dependencies."""
	if trees is None:
		global db
		trees = db
	writemsg("ZapDeps -- %s\n" % (use_binaries), 2)
	if not reduced or unreduced == ["||"] or dep_eval(reduced):
		return []

	if unreduced[0] != "||":
		unresolved = []
		for dep, satisfied in izip(unreduced, reduced):
			if isinstance(dep, list):
				unresolved += dep_zapdeps(dep, satisfied, myroot,
					use_binaries=use_binaries, trees=trees)
			elif not satisfied:
				unresolved.append(dep)
		return unresolved

	# We're at a ( || atom ... ) type level and need to make a choice
	deps = unreduced[1:]
	satisfieds = reduced[1:]

	# Our preference order is for an the first item that:
	# a) contains all unmasked packages with the same key as installed packages
	# b) contains all unmasked packages
	# c) contains masked installed packages
	# d) is the first item

	preferred = []
	possible_upgrades = []
	other = []

	# Alias the trees we'll be checking availability against
	vardb = None
	if "vartree" in trees[myroot]:
		vardb = trees[myroot]["vartree"].dbapi
	if use_binaries:
		mydbapi = trees[myroot]["bintree"].dbapi
	else:
		mydbapi = trees[myroot]["porttree"].dbapi

	# Sort the deps into preferred (installed) and other
	# with values of [[required_atom], availablility]
	for dep, satisfied in izip(deps, satisfieds):
		if isinstance(dep, list):
			atoms = dep_zapdeps(dep, satisfied, myroot,
				use_binaries=use_binaries, trees=trees)
		else:
			atoms = [dep]

		all_available = True
		for atom in atoms:
			if not mydbapi.match(atom):
				# With --usepkgonly, count installed packages as "available".
				# Note that --usepkgonly currently has no package.mask support.
				# See bug #149816.
				if use_binaries and vardb and vardb.match(atom):
					continue
				all_available = False
				break

		if not vardb:
			# called by repoman
			preferred.append((atoms, None, all_available))
			continue

		""" The package names rather than the exact atoms are used for an
		initial rough match against installed packages.  More specific
		preference selection is handled later via slot and version comparison."""
		all_installed = True
		for atom in set([dep_getkey(atom) for atom in atoms]):
			# New-style virtuals have zero cost to install.
			if not vardb.match(atom) and not atom.startswith("virtual/"):
				all_installed = False
				break

		# Check if the set of atoms will result in a downgrade of
		# an installed package. If they will then don't prefer them
		# over other atoms.
		has_downgrade = False
		versions = {}
		if all_installed or all_available:
			for atom in atoms:
				mykey = dep_getkey(atom)
				avail_pkg = best(mydbapi.match(atom))
				if not avail_pkg:
					continue
				avail_slot = "%s:%s" % (mykey,
					mydbapi.aux_get(avail_pkg, ["SLOT"])[0])
				versions[avail_slot] = avail_pkg
				inst_pkg = vardb.match(avail_slot)
				if not inst_pkg:
					continue
				# emerge guarantees 1 package per slot here (highest counter)
				inst_pkg = inst_pkg[0]
				if avail_pkg != inst_pkg and \
					avail_pkg != best([avail_pkg, inst_pkg]):
					has_downgrade = True
					break

		this_choice = (atoms, versions, all_available)
		if not has_downgrade:
			if all_installed:
				preferred.append(this_choice)
				continue
			elif all_available:
				possible_upgrades.append(this_choice)
				continue
		other.append(this_choice)

	# Compare the "all_installed" choices against the "all_available" choices
	# for possible missed upgrades.  The main purpose of this code is to find
	# upgrades of new-style virtuals since _expand_new_virtuals() expands them
	# into || ( highest version ... lowest version ).  We want to prefer the
	# highest all_available version of the new-style virtual when there is a
	# lower all_installed version.
	for possible_upgrade in list(possible_upgrades):
		atoms, versions, all_available = possible_upgrade
		myslots = set(versions)
		for other_choice in preferred:
			o_atoms, o_versions, o_all_available = other_choice
			intersecting_slots = myslots.intersection(o_versions)
			if not intersecting_slots:
				continue
			has_upgrade = False
			has_downgrade = False
			for myslot in intersecting_slots:
				myversion = versions[myslot]
				o_version = o_versions[myslot]
				if myversion != o_version:
					if myversion == best([myversion, o_version]):
						has_upgrade = True
					else:
						has_downgrade = True
						break
			if has_upgrade and not has_downgrade:
				o_index = preferred.index(other_choice)
				preferred.insert(o_index, possible_upgrade)
				possible_upgrades.remove(possible_upgrade)
				break
	preferred.extend(possible_upgrades)

	# preferred now contains a) and c) from the order above with
	# the masked flag differentiating the two. other contains b)
	# and d) so adding other to preferred will give us a suitable
	# list to iterate over.
	preferred.extend(other)

	for allow_masked in (False, True):
		for atoms, versions, all_available in preferred:
			if all_available or allow_masked:
				return atoms

	assert(False) # This point should not be reachable


def dep_expand(mydep, mydb=None, use_cache=1, settings=None):
	if not len(mydep):
		return mydep
	if mydep[0]=="*":
		mydep=mydep[1:]
	orig_dep = mydep
	mydep = dep_getcpv(orig_dep)
	myindex = orig_dep.index(mydep)
	prefix = orig_dep[:myindex]
	postfix = orig_dep[myindex+len(mydep):]
	return prefix + cpv_expand(
		mydep, mydb=mydb, use_cache=use_cache, settings=settings) + postfix

def dep_check(depstring, mydbapi, mysettings, use="yes", mode=None, myuse=None,
	use_cache=1, use_binaries=0, myroot="/", trees=None):
	"""Takes a depend string and parses the condition."""
	edebug = mysettings.get("PORTAGE_DEBUG", None) == "1"
	#check_config_instance(mysettings)
	if trees is None:
		trees = globals()["db"]
	if use=="yes":
		if myuse is None:
			#default behavior
			myusesplit = mysettings["USE"].split()
		else:
			myusesplit = myuse
			# We've been given useflags to use.
			#print "USE FLAGS PASSED IN."
			#print myuse
			#if "bindist" in myusesplit:
			#	print "BINDIST is set!"
			#else:
			#	print "BINDIST NOT set."
	else:
		#we are being run by autouse(), don't consult USE vars yet.
		# WE ALSO CANNOT USE SETTINGS
		myusesplit=[]

	#convert parenthesis to sublists
	mysplit = portage_dep.paren_reduce(depstring)

	mymasks = set()
	useforce = set()
	useforce.add(mysettings["ARCH"])
	if use == "all":
		# This masking/forcing is only for repoman.  In other cases, relevant
		# masking/forcing should have already been applied via
		# config.regenerate().  Also, binary or installed packages may have
		# been built with flags that are now masked, and it would be
		# inconsistent to mask them now.  Additionally, myuse may consist of
		# flags from a parent package that is being merged to a $ROOT that is
		# different from the one that mysettings represents.
		mymasks.update(mysettings.usemask)
		mymasks.update(mysettings.archlist())
		mymasks.discard(mysettings["ARCH"])
		useforce.update(mysettings.useforce)
		useforce.difference_update(mymasks)
	try:
		mysplit = portage_dep.use_reduce(mysplit, uselist=myusesplit,
			masklist=mymasks, matchall=(use=="all"), excludeall=useforce)
	except portage_exception.InvalidDependString, e:
		return [0, str(e)]

	# Do the || conversions
	mysplit=portage_dep.dep_opconvert(mysplit)

	if mysplit == []:
		#dependencies were reduced to nothing
		return [1,[]]

	# Recursively expand new-style virtuals so as to
	# collapse one or more levels of indirection.
	try:
		mysplit = _expand_new_virtuals(mysplit, edebug, mydbapi, mysettings,
			use=use, mode=mode, myuse=myuse, use_cache=use_cache,
			use_binaries=use_binaries, myroot=myroot, trees=trees)
	except portage_exception.ParseError, e:
		return [0, str(e)]

	mysplit2=mysplit[:]
	mysplit2=dep_wordreduce(mysplit2,mysettings,mydbapi,mode,use_cache=use_cache)
	if mysplit2 is None:
		return [0,"Invalid token"]

	writemsg("\n\n\n", 1)
	writemsg("mysplit:  %s\n" % (mysplit), 1)
	writemsg("mysplit2: %s\n" % (mysplit2), 1)

	myzaps = dep_zapdeps(mysplit, mysplit2, myroot,
		use_binaries=use_binaries, trees=trees)
	mylist = flatten(myzaps)
	writemsg("myzaps:   %s\n" % (myzaps), 1)
	writemsg("mylist:   %s\n" % (mylist), 1)
	#remove duplicates
	mydict={}
	for x in mylist:
		mydict[x]=1
	writemsg("mydict:   %s\n" % (mydict), 1)
	return [1,mydict.keys()]

def dep_wordreduce(mydeplist,mysettings,mydbapi,mode,use_cache=1):
	"Reduces the deplist to ones and zeros"
	deplist=mydeplist[:]
	for mypos in xrange(len(deplist)):
		if type(deplist[mypos])==types.ListType:
			#recurse
			deplist[mypos]=dep_wordreduce(deplist[mypos],mysettings,mydbapi,mode,use_cache=use_cache)
		elif deplist[mypos]=="||":
			pass
		else:
			mykey = dep_getkey(deplist[mypos])
			if mysettings and mysettings.pprovideddict.has_key(mykey) and \
			        match_from_list(deplist[mypos], mysettings.pprovideddict[mykey]):
				deplist[mypos]=True
			elif mydbapi is None:
				# Assume nothing is satisfied.  This forces dep_zapdeps to
				# return all of deps the deps that have been selected
				# (excluding those satisfied by package.provided).
				deplist[mypos] = False
			else:
				if mode:
					mydep=mydbapi.xmatch(mode,deplist[mypos])
				else:
					mydep=mydbapi.match(deplist[mypos],use_cache=use_cache)
				if mydep!=None:
					tmp=(len(mydep)>=1)
					if deplist[mypos][0]=="!":
						tmp=False
					deplist[mypos]=tmp
				else:
					#encountered invalid string
					return None
	return deplist

def cpv_getkey(mycpv):
	myslash=mycpv.split("/")
	mysplit=pkgsplit(myslash[-1])
	mylen=len(myslash)
	if mylen==2:
		return myslash[0]+"/"+mysplit[0]
	elif mylen==1:
		return mysplit[0]
	else:
		return mysplit

def key_expand(mykey, mydb=None, use_cache=1, settings=None):
	mysplit=mykey.split("/")
	if settings is None:
		settings = globals()["settings"]
	virts = settings.getvirtuals("/")
	virts_p = settings.get_virts_p("/")
	if len(mysplit)==1:
		if mydb and type(mydb)==types.InstanceType:
			for x in settings.categories:
				if mydb.cp_list(x+"/"+mykey,use_cache=use_cache):
					return x+"/"+mykey
			if virts_p.has_key(mykey):
				return(virts_p[mykey][0])
		return "null/"+mykey
	elif mydb:
		if type(mydb)==types.InstanceType:
			if (not mydb.cp_list(mykey,use_cache=use_cache)) and virts and virts.has_key(mykey):
				return virts[mykey][0]
		return mykey

def cpv_expand(mycpv, mydb=None, use_cache=1, settings=None):
	"""Given a string (packagename or virtual) expand it into a valid
	cat/package string. Virtuals use the mydb to determine which provided
	virtual is a valid choice and defaults to the first element when there
	are no installed/available candidates."""
	myslash=mycpv.split("/")
	mysplit=pkgsplit(myslash[-1])
	if settings is None:
		settings = globals()["settings"]
	virts = settings.getvirtuals("/")
	virts_p = settings.get_virts_p("/")
	if len(myslash)>2:
		# this is illegal case.
		mysplit=[]
		mykey=mycpv
	elif len(myslash)==2:
		if mysplit:
			mykey=myslash[0]+"/"+mysplit[0]
		else:
			mykey=mycpv
		if mydb and virts and mykey in virts:
			writemsg("mydb.__class__: %s\n" % (mydb.__class__), 1)
			if type(mydb)==types.InstanceType:
				if not mydb.cp_list(mykey, use_cache=use_cache):
					writemsg("virts[%s]: %s\n" % (str(mykey),virts[mykey]), 1)
					mykey_orig = mykey[:]
					for vkey in virts[mykey]:
						if mydb.cp_list(vkey,use_cache=use_cache):
							mykey = vkey
							writemsg("virts chosen: %s\n" % (mykey), 1)
							break
					if mykey == mykey_orig:
						mykey=virts[mykey][0]
						writemsg("virts defaulted: %s\n" % (mykey), 1)
			#we only perform virtual expansion if we are passed a dbapi
	else:
		#specific cpv, no category, ie. "foo-1.0"
		if mysplit:
			myp=mysplit[0]
		else:
			# "foo" ?
			myp=mycpv
		mykey=None
		matches=[]
		if mydb:
			for x in settings.categories:
				if mydb.cp_list(x+"/"+myp,use_cache=use_cache):
					matches.append(x+"/"+myp)
		if (len(matches)>1):
			raise ValueError, matches
		elif matches:
			mykey=matches[0]

		if not mykey and type(mydb)!=types.ListType:
			if virts_p.has_key(myp):
				mykey=virts_p[myp][0]
			#again, we only perform virtual expansion if we have a dbapi (not a list)
		if not mykey:
			mykey="null/"+myp
	if mysplit:
		if mysplit[2]=="r0":
			return mykey+"-"+mysplit[1]
		else:
			return mykey+"-"+mysplit[1]+"-"+mysplit[2]
	else:
		return mykey

def getmaskingreason(mycpv, settings=None, portdb=None):
	from portage_util import grablines
	if settings is None:
		settings = globals()["settings"]
	if portdb is None:
		portdb = globals()["portdb"]
	mysplit = catpkgsplit(mycpv)
	if not mysplit:
		raise ValueError("invalid CPV: %s" % mycpv)
	if not portdb.cpv_exists(mycpv):
		raise KeyError("CPV %s does not exist" % mycpv)
	mycp=mysplit[0]+"/"+mysplit[1]

	# XXX- This is a temporary duplicate of code from the config constructor.
	locations = [os.path.join(settings["PORTDIR"], "profiles")]
	locations.extend(settings.profiles)
	for ov in settings["PORTDIR_OVERLAY"].split():
		profdir = os.path.join(normalize_path(ov), "profiles")
		if os.path.isdir(profdir):
			locations.append(profdir)
	locations.append(os.path.join(settings["PORTAGE_CONFIGROOT"],
		USER_CONFIG_PATH.lstrip(os.path.sep)))
	locations.reverse()
	pmasklists = [grablines(os.path.join(x, "package.mask"), recursive=1) for x in locations]
	pmasklines = []
	while pmasklists: # stack_lists doesn't preserve order so it can't be used
		pmasklines.extend(pmasklists.pop(0))
	del pmasklists

	if settings.pmaskdict.has_key(mycp):
		for x in settings.pmaskdict[mycp]:
			if mycpv in portdb.xmatch("match-all", x):
				comment = ""
				l = "\n"
				comment_valid = -1