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#!/usr/bin/python
#
# Copyright(c) 2010, Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
#
"""Provides support functions for USE flag settings and analysis"""
__all__ = (
'get_iuse',
'get_installed_use',
'reduce_flag',
'reduce_flags',
'defaulted_flags',
'filter_flags',
'get_all_cpv_use',
'get_flags'
)
import sys
import portage
def get_iuse(cpv):
"""Gets the current IUSE flags from the tree
To be used when a gentoolkit package object is not needed
@type: cpv: string
@param cpv: cat/pkg-ver
@rtype list
@returns [] or the list of IUSE flags
"""
try:
# aux_get might return dupes, so run them through set() to remove them
iuse = set(portage.db[portage.root]["porttree"].dbapi.aux_get(cpv, ["IUSE"])[0].split())
# there could still be dupes due to IUSE defaults
iuse = [x for x in iuse if '+'+x not in iuse and '-'+x not in iuse]
return list(iuse)
except:
return []
def get_installed_use(cpv, use="USE"):
"""Gets the installed USE flags from the VARDB
To be used when a gentoolkit package object is not needed
@type: cpv: string
@param cpv: cat/pkg-ver
@type use: string
@param use: 1 of ["USE", "PKGUSE"]
@rtype list
@returns [] or the list of IUSE flags
"""
return portage.db[portage.root]["vartree"].dbapi.aux_get(cpv,[use])[0].split()
def reduce_flag(flag):
"""Absolute value function for a USE flag
@type flag: string
@param flag: the use flag to absolute.
@rtype: string
@return absolute USE flag
"""
if flag[0] in ["+","-"]:
return flag[1:]
else:
return flag
def reduce_flags(the_list):
"""Absolute value function for a USE flag list
@type the_list: list
@param the_list: the use flags to absolute.
@rtype: list
@return absolute USE flags
"""
r=[]
for member in the_list:
r.append(reduce_flag(member))
return r
def defaulted_flags(the_list):
"""Absolute value function for a USE flag list
@type the_list: list
@param the_list: the use flags to get defaulted ones from.
@rtype: dict of lists
@return defaulted USE flags {'+': [...], '-': [...]}
"""
r={"+":[], "-": []}
for member in the_list:
if member[0] in ["+","-"]:
r[member[0]].append(member[1:])
return r
def filter_flags(use, use_expand_hidden, usemasked, useforced):
"""Filter function to remove hidden or otherwise not normally
visible USE flags from a list.
@type use: list
@param use: the USE flag list to be filtered.
@type use_expand_hidden: list
@param use_expand_hidden: list of flags hidden.
@type usemasked: list
@param usemasked: list of masked USE flags.
@type useforced: list
@param useforced: the forced USE flags.
@rtype: list
@return the filtered USE flags.
"""
# clean out some environment flags, since they will most probably
# be confusing for the user
for f in use_expand_hidden:
f=f.lower() + "_"
for x in use:
if f in x:
use.remove(x)
# clean out any arch's
archlist = portage.settings["PORTAGE_ARCHLIST"].split()
for a in use[:]:
if a in archlist:
use.remove(a)
# dbl check if any from usemasked or useforced are still there
masked = usemasked + useforced
for a in use[:]:
if a in masked:
use.remove(a)
return use
def get_all_cpv_use(cpv):
"""Uses portage to determine final USE flags and settings for an emerge
@type cpv: string
@param cpv: eg cat/pkg-ver
@rtype: lists
@return use, use_expand_hidden, usemask, useforce
"""
use = None
portage.db[portage.root]["porttree"].dbapi.settings.unlock()
try:
portage.db[portage.root]["porttree"].dbapi.settings.setcpv(cpv, mydb=portage.portdb)
use = portage.settings['PORTAGE_USE'].split()
use_expand_hidden = portage.settings["USE_EXPAND_HIDDEN"].split()
usemask = list(portage.db[portage.root]["porttree"].dbapi.settings.usemask)
useforce = list(portage.db[portage.root]["porttree"].dbapi.settings.useforce)
except KeyError:
portage.db[portage.root]["porttree"].dbapi.settings.reset()
portage.db[portage.root]["porttree"].dbapi.settings.lock()
return [], [], [], []
# reset cpv filter
portage.db[portage.root]["porttree"].dbapi.settings.reset()
portage.db[portage.root]["porttree"].dbapi.settings.lock()
return use, use_expand_hidden, usemask, useforce
def get_flags(cpv, final_setting=False):
"""Retrieves all information needed to filter out hidded, masked, etc.
USE flags for a given package.
@type cpv: string
@param cpv: eg. cat/pkg-ver
@type final_setting: boolean
@param final_setting: used to also determine the final
enviroment USE flag settings and return them as well.
@rtype: list or list, list
@return IUSE or IUSE, final_flags
"""
final_use, use_expand_hidden, usemasked, useforced = get_all_cpv_use(cpv)
iuse_flags = filter_flags(get_iuse(cpv), use_expand_hidden, usemasked, useforced)
if final_setting:
final_flags = filter_flags(final_use, use_expand_hidden, usemasked, useforced)
return iuse_flags, final_flags
return iuse_flags
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