#!/bin/sh
# $OpenBSD: mount_vnd,v 1.1 2007/04/14 11:54:00 grunk Exp $
#
# Copyright (c) 2005, 2006, 2007 David Krause <david@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.


progname=`basename "$0"`
usage() {
	cat <<-EOF
	usage: $progname [-k] [-K rounds] [-o options] [-S saltfile] image node
	EOF
	exit 1
}

kflag=
ROUNDS=
SALTFILE=

args=`getopt kK:o:S: $*`
if [ $? -ne 0 ]; then
	usage
fi

set -eu

set -- $args
while [ $# -ge 0 ]; do
	case "$1" in
		-k)
			kflag="$1"; shift;;
		-K)
			ROUNDS="$2"; shift; shift;;
		-o)
			# currently, no mount options have effect for vnd
			shift; shift;;
		-S)
			SALTFILE="$2"; shift; shift;;
		--)
			shift; break;;
	esac
done

if [ $# -ne 2 ]; then
	usage
fi

IMAGE="$1"
VND="$2"

if [ -n "${ROUNDS}" -a ! -n "${SALTFILE}" ]; then
	SALTFILE="${IMAGE}.slt"
fi

if [ -n "${ROUNDS}" -a -n "${kflag}" ]; then
	echo "$progname: -k and -K are mutually exclusive" 1>&2
	exit 1
elif [ -n "${SALTFILE}" -a ! -n "${ROUNDS}" ]; then
	echo "$progname: -S only makes sense when used with -K" 1>&2
	exit 1
elif [ ! -b "${IMAGE}" -a ! -f "${IMAGE}" ]; then
	echo "$progname: ${IMAGE}: No such file" 1>&2
	exit 1
elif [ -n "${SALTFILE}" -a ! -f "${SALTFILE}" ]; then
	echo "$progname: ${SALTFILE}: No such file" 1>&2
	exit 1
elif [ ! -b "${VND}" ]; then
	echo "$progname: ${VND}: No such block device" 1>&2
	exit 1
fi

vnconfig -l ${VND} > /dev/null
if vnconfig -l ${VND} | fgrep -q covering; then
	echo "$progname: ${VND} is already in use" 1>&2
	exit 1
fi

echo "${IMAGE} on ${VND}"
if [ -n "${ROUNDS}" ]; then
	vnconfig -K ${ROUNDS} -S ${SALTFILE} ${VND} ${IMAGE}
elif [ -n "${kflag}" ]; then
	vnconfig -k ${VND} ${IMAGE}
else
	vnconfig ${VND} ${IMAGE}
fi