#!/bin/sh
# Unpack a nfs root image into place.
set -e

error () {
	echo "$@" >&2
	exit 1
}

if [ -z "$NFSROOT_DIR" ] || [ "$NFSROOT_DIR" = / ]; then
	error "Bad NFSROOT_DIR $NFSROOT_DIR"
fi

mkdir -p $NFSROOT_DIR
cd $NFSROOT_DIR

if [ -e "$NFSROOT_IMAGE_ALT" ] && [ "$NFSROOT_IMAGE_ALT" -nt "$NFSROOT_IMAGE" ]; then
	echo "Using nfsroot image: alternate"
	NFSROOT_IMAGE="$NFSROOT_IMAGE_ALT"
else
	echo "Using nfsroot image: primary"
fi

if [ ! -e "$NFSROOT_IMAGE" ]; then
	error "NFSROOT_IMAGE $NFSROOT_IMAGE does not exist"
fi

tar zxf $NFSROOT_IMAGE