#!/bin/sh

#

# kpartx_id

#

# Generates ID information for device-mapper tables.

#

# Copyright (C) 2006 SUSE Linux Products GmbH

# Author:

#       Hannes Reinecke <hare@suse.de>

#

#

#       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.

#

# This script generates ID information used to generate persistent symlinks.

# It relies on the UUID strings generated by the various programs; the name

# of the tables are of no consequence.

#

# Please note that dmraid does not provide the UUIDs (yet); a patch has been

# sent upstream but has not been accepted yet.

#

DMSETUP=/sbin/dmsetup

MAJOR=$1

MINOR=$2

UUID=$3

if [ -z "$MAJOR" -o -z "$MINOR" ]; then

    echo "usage: $0 major minor"

    exit 1;

fi

# Device-mapper not installed; not an error

if [ ! -x $DMSETUP ] ; then

    exit 0

fi

# Table UUIDs are always '<type>-<uuid>'.

dmuuid=${UUID#*-}

dmtbl=${UUID%%-*}

dmpart=${dmtbl#part}

dmserial=

# kpartx types are 'part<num>'

if [ "$dmpart" = "$dmtbl" ] ; then

    dmpart=

else

    dmtbl=part

fi

# Set the name of the table. We're only interested in dmraid,

# multipath, and kpartx tables; everything else is ignored.

if [ "$dmtbl" = "part" ] ; then

    dmname=$($DMSETUP info  -c --noheadings -o name -u $dmuuid)

    echo "DM_MPATH=$dmname"

    # We need the dependencies of the parent table to figure out

    # the type if the parent is a multipath table

    case "$dmuuid" in

	mpath-*)

	    dmdeps=$($DMSETUP deps -u $dmuuid)

	    dmserial=${dmuuid#mpath-}

	    ;;

    esac

elif [ "$dmtbl" = "mpath" ] ; then

    dmname="$dmuuid"

    dmserial="$dmuuid"

    # We need the dependencies of the table to figure out the type

    dmdeps=$($DMSETUP deps -u $UUID)

fi

[ -n "$dmpart" ] && echo "DM_PART=$dmpart"

# Figure out the type of the map. For non-multipath maps it's

# always 'raid'.

if [ -n "$dmdeps" ] ; then

    case "$dmdeps" in

	*\(94,*)

	    echo "DM_TYPE=ccw"

	    ;;

	*\(104,* | *\(105,* | *\(106,* | *\(107,* | *\(108,* | *\(109,* | *\(110,* | *\(112,*)

	    echo "DM_TYPE=cciss"

	    ;;

	*\(9*)

	    echo "DM_TYPE=raid"

	    ;;

	*)

	    echo "DM_TYPE=scsi"

	    echo "DM_WWN=0x${dmserial#?}"

	    ;;

    esac

else

    echo "DM_TYPE=raid"

fi

if [[ $dmserial ]]; then

    echo "DM_SERIAL=$dmserial"

fi

exit 0