#!/bin/sh

set -eu

usage()
{
	echo "Usage: $(basename $0) <initramfs file>"
}

if [ "$#" -eq 0 ] ; then
	usage >&2
	exit 1
fi

cpio_args="--extract --quiet --list"

OPTIONS=`getopt -o hl --long help,long -n "$0" -- "$@"`
# Check for non-GNU getopt
if [ $? != 0 ] ; then echo "W: non-GNU getopt" >&2 ; exit 1 ; fi

eval set -- "$OPTIONS"

while true; do
        case "$1" in
        -h|--help)
		usage
		exit 0
	;;
	-l|--long)
		cpio_args="${cpio_args:+${cpio_args} --verbose}"
		shift
	;;
	--)
		shift
		break
	;;
	*)
		echo "Internal error!" >&2
		exit 1
	esac
done

for initramfs in "$@" ; do
	if ! [ -r "${initramfs}" ] ; then
		echo "Specified file could not be read." >&2
		exit 1
	else
		echo "${initramfs}"
		if zcat -t "${initramfs}" >/dev/null 2>&1 ; then
			zcat "${initramfs}" | cpio ${cpio_args}
		elif xzcat -t "$initramfs" >/dev/null 2>&1 ; then
			xzcat "$initramfs" | cpio ${cpio_args}
		elif bzip2 -t "$initramfs" >/dev/null 2>&1 ; then
			bzip2 -c -d "$initramfs" | cpio ${cpio_args}
		elif lzop -t "$initramfs" >/dev/null 2>&1 ; then
			lzop -c -d "$initramfs" | cpio ${cpio_args}
		fi

	fi
done