#============================================================================
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#============================================================================
# Copyright (C) 2006 International Business Machines Corp.
# Author: Reiner Sailer <sailer@us.ibm.com>
#============================================================================

"""Listing available labels for a policy.
"""
import sys
import traceback
from xen.util.xsm.xsm import XSMError, err
from xen.xm.opts import OptionError
from xen.util.acmpolicy import ACMPolicy
from xen.util import xsconstants
from xen.xm.main import server
from xen.xm import main as xm_main


def help():
    return """
    Prints labels of the specified type (default is dom)
    that are defined in policy (default is current hypervisor policy)."""

def main(argv):
    policy = None
    ptype = None
    for arg in argv[1:]:
        key_val = arg.split('=')
        if len(key_val) == 2 and key_val[0] == 'type':
            if ptype:
                raise OptionError('type is definied twice')
            ptype = key_val[1].lower()

        elif len(key_val) == 1:
            if policy:
                raise OptionError('policy is defined twice')
            policy = arg
        else:
            raise OptionError('Unrecognised option: %s' % arg)

    if xm_main.serverType != xm_main.SERVER_XEN_API:
        labels(policy, ptype)
    else:
        labels_xapi(policy, ptype)

def labels(policy, ptype):

    labels = server.xend.security.list_labels(policy, ptype)
    labels.sort()
    for label in labels:
        print label


def labels_xapi(policy, ptype):
    policystate = server.xenapi.XSPolicy.get_xspolicy()
    if int(policystate['type']) == xsconstants.XS_POLICY_ACM:
        acmpol = ACMPolicy(xml=policystate['repr'])
        if policy and policy != acmpol.get_name():
            print "Warning: '%s' is not the currently loaded policy." % policy
            return labels(policy, ptype)
        names1 = []
        names2 = []
        if not ptype or ptype == 'dom' or ptype == 'any':
            names1 = acmpol.policy_get_virtualmachinelabel_names()
        if ptype == 'res' or ptype == 'any':
            names2 = acmpol.policy_get_resourcelabel_names()
        names = list(set(names1).union(names2))
        names.sort()
        for n in names:
            print n
    elif int(policystate['type']) == 0:
        err("No policy installed on the system.")
    else:
        err("Unsupported type of policy installed on the system.")

if __name__ == '__main__':
    main(sys.argv)