#!/usr/bin/python2.7

# Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import os
from subprocess import check_call, Popen, PIPE
import sys
import traceback

import smf_include


def start():
    # pull out the current version of config/upgrade-id
    p = Popen(['/usr/bin/svcprop', '-p', 'config/upgrade-id',
               os.environ['SMF_FMRI']], stdout=PIPE, stderr=PIPE)
    curr_ver, _err = p.communicate()
    curr_ver = curr_ver.strip()

    # extract the openstack-upgrade-id from the pkg
    p = Popen(['/usr/bin/pkg', 'contents', '-H', '-t', 'set', '-o', 'value',
               '-a', 'name=openstack.upgrade-id',
               'pkg:/cloud/openstack/horizon'], stdout=PIPE, stderr=PIPE)
    pkg_ver, _err = p.communicate()
    pkg_ver = pkg_ver.strip()

    if curr_ver == pkg_ver:
        # No need to upgrade
        sys.exit(smf_include.SMF_EXIT_OK)

    # In versions of OpenStack prior to Mitaka, 'openstack-dashboard-http.conf'
    # and 'openstack-dashboard-tls.conf' were delivered by the
    # cloud/openstack/horizon package.  Look for the existence of either file
    # in Apache's conf.d directory.  If either are found, exit the service
    # degraded so the administrator can investigate why.
    for filename in ['openstack-dashboard-http.conf',
                     'openstack-dashboard-tls.conf']:
        path = os.path.join('/etc/apache2/2.4/conf.d', filename)
        if os.path.exists(path) or os.path.islink(path):
            reason = '/etc/apache2/2.4/conf.d/%s found.  ' % filename + \
                     'Starting with the Mitaka release, Horizon is now a ' + \
                     'stand-alone service and should be configured ' + \
                     'independently from the ' + \
                     'svc:/network/http:apache24 service.  ' + \
                     '/etc/apache2/2.4/conf.d/%s should be ' % filename + \
                     'removed before restarting the ' + \
                     'svc:/network/http:apache24 service'
            smf_include.smf_method_exit(smf_include.SMF_EXIT_DEGRADED,
                                        'Apache_Configured', reason)

    # update the current version
    check_call(['/usr/sbin/svccfg', '-s', os.environ['SMF_FMRI'], 'setprop',
                'config/upgrade-id', '=', pkg_ver])
    check_call(['/usr/sbin/svccfg', '-s', os.environ['SMF_FMRI'], 'refresh'])

    sys.exit(smf_include.SMF_EXIT_OK)


if __name__ == '__main__':
    os.putenv('LC_ALL', 'C')
    try:
        smf_include.smf_main()
    except RuntimeError:
        sys.exit(smf_include.SMF_EXIT_ERR_FATAL)
    except Exception as err:
        print 'Unknown error:  %s' % err
        print
        traceback.print_exc(file=sys.stdout)
        sys.exit(smf_include.SMF_EXIT_ERR_FATAL)