#! /bin/sh -e
TYPE="$1"

case $TYPE in
    maybe-floppy)
	logger -t list-devices "deprecated parameter maybe-floppy"
	TYPE=floppy
	;;
    cd|disk|partition|floppy|maybe-usb-floppy) ;;
    *)
	echo "Usage: $0 cd|disk|partition|floppy|maybe-usb-floppy" >&2
	exit 2
	;;
esac

if [ ! -d /sys/block ]; then
	exit 0
fi
if type udevadm >/dev/null 2>&1; then
	device_info () {
		udevadm info -q "$1" -p "$2" 2>/dev/null
	}
elif type udevinfo >/dev/null 2>&1; then
	device_info () {
		udevinfo -q "$1" -p "$2" 2>/dev/null
	}
else
	exit 0
fi

syspaths=
scan_partition=false
case $TYPE in
    partition)
	for x in /sys/block/*/*[0-9]; do
		[ -d "$x" ] || continue
		syspaths="${syspaths:+$syspaths }$x"
	done
	TYPE=disk
	# Also allow misdetected USB devices
	scan_partition=:
	;;
    *)
	for x in /sys/block/*; do
		[ -d "$x" ] || continue
		syspaths="${syspaths:+$syspaths }$x"
	done
	;;
esac
for x in $syspaths; do
	devpath="${x#/sys}"
	match=false
	case $TYPE in
	    floppy)
		# TODO ugly special case for non-IDE floppies
		case $devpath in
		    /block/fd[0-9]*)
			match=:
			;;
		esac
		;;
	esac
	if ! $match && [ "$TYPE" = cd ]; then
		if device_info env "$devpath" | grep -q '^ID_CDROM='; then
			match=:
		fi
	fi
	if ! $match; then
		if device_info env "$devpath" | grep -q "^ID_TYPE=$TYPE"; then
			match=:
		fi
	fi
	if ! $match && [ "$TYPE" = disk ]; then
		case $devpath in
		    /block/cciss\!*|/block/ida\!*|/block/rd\!*|/block/mmcblk*)
			match=:
			;;
		esac
	fi
	# Some USB sticks and CD drives are misdetected as floppy
	# This allows to scan for those
	if ! $match && ( $scan_partition || [ "$TYPE" = maybe-usb-floppy ] ); then
		if device_info env "$devpath" | grep -q '^ID_BUS=usb' && \
		   device_info env "$devpath" | grep -q '^ID_TYPE=floppy'; then
			match=:
		fi
	fi
	if $match; then
		if ! name="$(device_info name "$devpath")"; then
			name="$(printf %s "${devpath##*/}" | \
				sed 's,!,/,g')"
		fi
		echo "/dev/$name"
	fi
done
