#!/usr/bin/python2.6

# Copyright (c) 2014, 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 ConfigParser

import os

import sys

import smf_include

from subprocess import CalledProcessError, Popen, PIPE, check_call

def start():

    """ retrieves the setting for 'zfs_volume_base' from Cinder's conf file in

    order to set it up properly for Cinder to use.

    """

    parser = ConfigParser.ConfigParser()

    parser.read("/etc/cinder/cinder.conf")

    # set up the top-level dataset with the proper permissions for cinder

    top_ds = parser.get("DEFAULT", "zfs_volume_base")

    # look to see if the dataset exists

    cmd = ["/usr/sbin/zfs", "list", top_ds]

    try:

        check_call(cmd, stdout=PIPE, stderr=PIPE)

    except CalledProcessError as err:

        # the dataset doesn't exist, so go create it

        try:

            check_call(["/usr/sbin/zfs", "create", "-p", top_ds])

        except CalledProcessError as err:

            print "unable to create %s:  %s" % (top_ds, err)

            return smf_include.SMF_EXIT_ERR_CONFIG

    # get the mountpoint

    cmd = ["/usr/sbin/zfs", "get", "-H", "-o", "value", "mountpoint", top_ds]

    p = Popen(cmd, stdout=PIPE, stderr=PIPE)

    mountpoint, error = p.communicate()

    if p.returncode != 0:

        print "unable to determine mountpoint of %s:  %s" % (top_ds, error)

        return smf_include.SMF_EXIT_ERR_CONFIG

    p = Popen(["/usr/bin/ls", "-dv", mountpoint], stdout=PIPE, stderr=PIPE)

    output, error = p.communicate()

    if "user:cinder:add_subdirectory/append_data:allow" not in output:

        # set an ACL to all mountpoint access

        try:

            check_call(["/usr/bin/chmod",

                        "A+user:cinder:add_subdirectory:allow",

                        mountpoint.strip()])

        except CalledProcessError as err:

            print "ACL creation for mountpoint access of "

            print "%s to 'cinder' failed:  %s" % (top_ds, err)

            return smf_include.SMF_EXIT_ERR_CONFIG

    # set delegation

    cmd = ["/usr/sbin/zfs", "allow", "cinder",

           "clone,create,destroy,mount,snapshot", top_ds]

    try:

        check_call(cmd)

    except CalledProcessError as err:

        print "delegation of %s to 'cinder' failed:  %s" % (top_ds, err)

        return smf_include.SMF_EXIT_ERR_CONFIG

    return smf_include.SMF_EXIT_OK

if __name__ == "__main__":

    os.putenv("LC_ALL", "C")

    smf_include.smf_main()