#!/bin/sh

. /usr/share/os-prober/common.sh

set -e

partition="$1"

bootpart="$2"

mpoint="$3"

type="$4"

found_item=0

title=""

rootdev=""

kernel=""

parameters=""

initrd=""

read_only=""

default_rootdev=""

default_kernel=""

default_parameters=""

default_initrd=""

default_read_only=""

dequote () {

	item="${1%\"}"

	echo "${item#\"}"

}

recordstanza () {

	if [ -n "$kernel" ] && [ -n "$title" ]; then

		if [ -e "$mpoint/$kernel" ] || [ -e "$mpoint/boot$kernel" ]; then

			if [ -e "$mpoint/boot$initrd" ] || [ -e "$mpoint/$initrd" ]; then

				if [ "$read_only" ]; then

					parameters="ro $parameters"

				fi

				if [ "$rootdev" ]; then

					parameters="root=$rootdev $parameters"

				fi

				parameters="${parameters% }"

				result "$rootpart:$bootpart:$title:$kernel:$initrd:$parameters"

				found_item=1

			else

				debug "cannot find $initrd, not recording"

			fi

		else

			debug "cannot find $kernel, not recording"

		fi

		title=""

		rootdev="$default_rootdev"

		kernel="$default_kernel"

		parameters="$default_parameters"

		initrd="$default_initrd"

		read_only="$default_read_only"

	else

		# Everything before set default values.

		default_rootdev="$rootdev"

		default_kernel="$kernel"

		default_parameters="$parameters"

		default_initrd="$initrd"

		default_read_only="$read_only"

	fi

}

parse_silo_conf () {

	mpoint="$1"

	rootpart="$2"

	bootpart="$3"

	IFS=" 	="

	while read line; do

		debug "parsing: $line"

		set -f

		set -- $line

		set +f

		case "$1" in

			root)

				rootdev=$(dequote "$2")

			;;

			image)

				recordstanza

				# Dereference if symbolic link

				if echo "$2" | grep -qs "/boot/"; then

					kernel="$(readlink -f "$(dequote "$mpoint$2")" | sed -e 's#'"$mpoint"'##g')"

				else

					kernel="$(readlink -f "$(dequote "$mpoint/boot$2")" | sed -e 's#'"$mpoint"'/boot##g')"

				fi

			;;

			append)

				shift 1

				parameters=$(dequote "${line#append=}")

			;;

			initrd)

				# Dereference if symbolic link

				if echo "$2" | grep -qs "/boot/"; then

					initrd="$(readlink -f "$(dequote "$mpoint$2")" | sed -e 's#'"$mpoint"'##g')"

				else

					initrd="$(readlink -f "$(dequote "$mpoint/boot$2")" | sed -e 's#'"$mpoint"'/boot##g')"

				fi

			;;

			label)

				shift 1

				title=$(dequote "$*" | sed -e 's/:/ /g')

			;;

			other)

				recordstanza

			;;

			read-only)

				read_only=1

			;;

		esac

	done

	recordstanza

}

if [ -e "$mpoint/boot/silo.conf" ]; then

	debug "parsing silo.conf"

	parse_silo_conf "$mpoint" "$partition" "$bootpart" < "$mpoint/boot/silo.conf"

fi

if [ "$found_item" = 0 ]; then

	exit 1

else

	exit 0

fi