#!/bin/sh

modprobe -q openprom > /dev/null 2>&1

# no openprom support... suckage.
if [ ! -e /dev/openprom ]; then
	exit 1
fi

dev_to_obp() {
	device=$1

	if [ ! -e $device ] || [ -z "$device" ]; then
		exit 1
	fi

	device=$(readlink -f $device)

	# get the parent block device
	block=$(echo $device | sed -e 's#/dev/##g' -e 's/[0-9]*//g')

	# partition number
	partnum=$(echo $device | sed -e 's#.*'$block'##g')

	# scd and sg are special
	if [ "$block" = "scd" ] || [ "$block" = "sg" ]; then
		block=sr$partnum
	fi

	# convert partnum to letter
	if [ -n "$partnum" ]; then
		# convert to a letter
		partalpha=$(printf ';\'$(($partnum + 140)))
	fi

	# expand the device and replace / with # for commodity.
	syspath=$(readlink -f /sys/block/$block/device | sed -e 's/\//#/g')

	# backup IFS
	OLDIFS="${IFS}"

	# export # as IFS (from above sed since we need to be able to print /)
	export IFS="#"

	# recursive loop into /sys and we update $path on each match.
	# the last match is of course the closest to the device.
	for i in $syspath; do
		pathto="$pathto$i/"
		if [ -e ${pathto}obppath ]; then
			path=$(cat ${pathto}obppath)
		fi
		last="$i"
	done

	# reset IFS to default
	export IFS=${OLDIFS}

	# get what kind of media it is.
	media=$(cat /sys/block/$block/device/media) 2>/dev/null || media=$(cat /sys/block/$block/device/type) 2>/dev/null 
	case $media in
		0|e) media=disk ;;
		5) media=cdrom ;;
	esac

	if [ "$media" = "cdrom" ]; then
		partalpha=;f
	fi

	if echo $path | grep -qE '(scsi|sas|sbus)'; then
		target=$(echo $last | cut -d ":" -f 3)
		lun=$(echo $last | cut -d ":" -f 4)
		if echo $path | grep -q sbus; then
			path="$path/sd@$target,$lun"
		else
			path="$path/disk@$target,$lun"
		fi
	elif echo $path | grep -q ide; then
		slotalpha=$(echo $block | sed -e 's/.*hd//g' -e 's/.*sd//g')
		slotnum="$(printf '%d' "'$slotalpha")"
		slotnum="$(($slotnum - 97))"
		path="$path/$media@$slotnum"
	elif echo $path | grep -q qlc; then
		target=$(echo $last | cut -d ":" -f 3)
		lun=$(echo $last | cut -d ":" -f 4)
		path="$path/fp@0,0/disk@$(($target + 1)),$lun"
	elif echo $path | grep -q virtual-devices; then
		media=disk
		path="/virtual-devices/$(basename $path | sed -e 's/,.*//g')"
	fi
	echo $media $path \;$partnum $partalpha
}

find_obp_alias() {
	media="$1"
	path="$2"
	partnum="$3"
	partalpha="$4"

	prtconf="$(prtconf -pv)"

	# special case for sbus. kernel always reports /sbus@numbers/
	# but OBP exports only /sbus/ if it's the only one detected
	# on system.
	if echo $path | grep -q sbus && [ -z "$(echo "$prtconf" | grep "$path" | grep -v boot | head -n 1 | cut -d ":" -f 1)" ]; then
		path=$(echo /sbus/${path#/sbus*/})
	fi

	# special case SAS. kernel reports to us disk@$target,$lun but
	# OBP can accept also disk@$target as valid alias
	if echo $path | grep -q sas && [ -z "$(echo "$prtconf" | grep "$path" | grep -v boot | head -n 1 | cut -d ":" -f 1)" ]; then
		path=$(echo $path | sed -e 's#,[0-9]$##g')
	fi

	alias="$(echo "$prtconf" | grep "$path" | grep -v boot | head -n 1 | cut -d ":" -f 1)"
	obppath="$(echo "$prtconf" | grep "$alias:" | cut -d ":" -f 2 | sed -e "s#'##g")"
	echo $alias $obppath $partnum $partalpha
}

obpdump="$(dev_to_obp $1)"

if [ -n "$obpdump" ]; then
	obpalias=$(find_obp_alias $obpdump)
fi

echo $obpalias