#!/bin/bash

#

# fc_wwpn_id

#

# Generates device node names links based on FC WWPN

# Copyright (c) 2016 Hannes Reinecke, SUSE Linux GmbH

#

# This program is free software; you can redistribute it and/or modify it

# under the terms of the GNU General Public License as published by the

# Free Software Foundation version 2 of the License.

#

DEVPATH=$1

SCSIPATH=$(cd -P "/sys$DEVPATH/device" || exit; echo "$PWD")

d=$SCSIPATH

[ -d "$d/scsi_disk" ] || exit 0

target_lun=${d##*:}

while [ -n "$d" ] ; do

    d=${d%/*}

    e=${d##*/}

    case "$e" in

	rport*)

	    rport=$e

	    rport_dir="/sys/class/fc_remote_ports/$rport"

	    if [ -d "$rport_dir" ] ; then

		rport_wwpn=$(cat "$rport_dir/port_name")

	    fi

	    ;;

	host*)

	    host=$e

	    host_dir="/sys/class/fc_host/$host"

	    if [ -d "$host_dir" ] ; then

		host_wwpn=$(cat "$host_dir/port_name")

		break;

	    fi

    esac

done

if [ -n "$rport_wwpn" ] || [ -n "$host_wwpn" ] ; then

    echo "FC_TARGET_LUN=$target_lun"

fi

if [ -n "$rport_wwpn" ] ; then

    echo "FC_TARGET_WWPN=$rport_wwpn"

fi

if [ -n "$host_wwpn" ] ; then

    echo "FC_INITIATOR_WWPN=$host_wwpn"

fi