#!/usr/bin/python2.6

# Copyright (c) 2015, 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.

from ConfigParser import NoOptionError
from datetime import datetime
import errno
import glob
import os
import shutil
from subprocess import check_call, Popen, PIPE
import sys
import traceback

import iniparse
import smf_include


def modify_conf(old_file):
    """ Copy over all uncommented options from the old configuration file.
    """

    new_file = old_file + '.new'

    # open the previous version
    old = iniparse.ConfigParser()
    old.readfp(open(old_file))

    # open the new version
    new = iniparse.ConfigParser()
    try:
        new.readfp(open(new_file))
    except IOError as err:
        if err.errno == errno.ENOENT:
            # The upgrade did not deliver a .new file so, return
            print "%s not found - continuing with %s" % (new_file, old_file)
            return
        else:
            raise
    print "\nupdating %s" % old_file

    # walk every single section for uncommented options
    default_items = set(old.items('DEFAULT'))
    for section in old.sections() + ['DEFAULT']:

        # DEFAULT items show up in every section so remove them
        if section != 'DEFAULT':
            section_items = set(old.items(section)) - default_items
        else:
            section_items = default_items

        for key, value in section_items:
            # keep a copy of the old value
            oldvalue = value
            oldsection = section

            if not new.has_section(section):
                if section != 'DEFAULT':
                    new.add_section(section)

            # print to the log when a value for the same section.key is
            # changing to a new value
            try:
                new_value = new.get(section, key)
                if new_value != value and '%SERVICE' not in new_value:
                    print "Changing [%s] %s:\n- %s\n+ %s" % \
                        (section, key, oldvalue, new_value)
                    print
            except NoOptionError:
                # the new configuration file does not have this option set so
                # just continue
                pass

            # Only copy the old value to the new conf file if the entry doesn't
            # exist or if it contains '%SERVICE'
            if not new.has_option(section, key) or \
               '%SERVICE' in new.get(section, key):
                new.set(section, key, value)
            section = oldsection

    # copy the old conf file to a backup
    today = datetime.now().strftime("%Y%m%d%H%M%S")
    shutil.copy2(old_file, old_file + '.' + today)

    # copy the new conf file in place
    with open(old_file, 'wb+') as fh:
        new.write(fh)


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/swift'], 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)

    # look for any .new files
    if glob.glob('/etc/swift/*.new'):
        # the versions are different, so perform an upgrade
        # modify the configuration files
        modify_conf('/etc/swift/account-server.conf')
        modify_conf('/etc/swift/container-reconciler.conf')
        modify_conf('/etc/swift/container-server.conf')
        modify_conf('/etc/swift/container-sync-realms.conf')
        modify_conf('/etc/swift/dispersion.conf')
        modify_conf('/etc/swift/memcache.conf')
        modify_conf('/etc/swift/object-expirer.conf')
        modify_conf('/etc/swift/object-server.conf')
        modify_conf('/etc/swift/proxy-server.conf')
        modify_conf('/etc/swift/swift.conf')

    # 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 Exception as err:
        print 'Unknown error:  %s' % err
        print
        traceback.print_exc(file=sys.stdout)
        sys.exit(smf_include.SMF_EXIT_ERR_FATAL)