#!/bin/sh

# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.

# NOTE(vish): This script helps udev create  common names for discovered iscsi
#             volumes under /dev/iscsi.  To use it, create /dev/iscsi and add
#             a file to /etc/udev/rules.d like so:
#             mkdir /dev/iscsi
#             echo 'KERNEL=="sd*", BUS=="scsi", PROGRAM="/path/to/iscsidev.sh
#             %b",SYMLINK+="iscsi/%c%n"' > /etc/udev/rules.d/55-openiscsi.rules

BUS=${1}
HOST=${BUS%%:*}

if [ ! -e /sys/class/iscsi_host ]; then
    exit 1
fi

file="/sys/class/iscsi_host/host${HOST}/device/session*/iscsi_session*/session*/targetname"

target_name=$(cat ${file})

if [ -z "${target_name}" ]; then
   exit 1
fi

echo "${target_name##*:}"