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

case $TYPE in
    maybe-floppy)
	logger -t list-devices "deprecated parameter maybe-floppy"
	TYPE=floppy
        ;;
    cd|disk|partition|floppy)
        ;;
    usb-partition|maybe-usb-floppy)
	# USB is not supported on hurd
        exit 0
        ;;
    *)
	echo "Usage: $0 cd|disk|partition|floppy|maybe-usb-floppy|usb-partition" >&2
	exit 2
        ;;
esac

#
# We are using the entries present in /dev to detect the different kind
# of devices. Some heuristics are then used to refine the result.
#

is_cd_kernel() {
	dev="${1#/dev/}"
	grep -q "kernel: $dev: .* CDROM drive" /var/log/syslog || \
	grep -q "kernel: $dev at .*> cdrom " /var/log/syslog
}

is_cd() {
	echo "$1" | egrep -q '^/dev/cd[0-9]+$' && return 0

	# FIXME: this also detect hard drives, but anyway the mount will
	# later fail

	echo "$1" | egrep -q '^/dev/[shw]d[0-9]+$' || return 1
	
	is_cd_kernel "$1"
}

is_disk() {
	echo "$1" | egrep -q '^/dev/[shw]d[0-9]+$' || return 1
	
	! is_cd_kernel "$1"
}

is_partition() {
	echo "$1" | egrep -q '^/dev/[shw]d[0-9]+s[0-9]+$' || return 1
	
	return 0
}

is_floppy() {
	echo "$1" | egrep -q '^/dev/fd[0-9]+$' || return 1

	return 0
}

# Loop through some /dev/ entries and test all the character ones
for x in /dev/fd* /dev/hd* /dev/sd* /dev/wd* /dev/cd* ; do
	[ -b "$x" -a -s "$x" ] || continue

	if is_$TYPE "$x" ; then
		echo $x
	fi
done

exit 0