#!/bin/sh
# Unpack (or copy) a netboot image into place.
set -e

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

if [ ! -e "$TFTP_DIR" ]; then
	error "Bad TFTPDIR $TFTP_DIR does not exist"
fi

if [ -e "$NETBOOT_IMAGE_ALT" ] && [ "$NETBOOT_IMAGE_ALT" -nt "$NETBOOT_IMAGE" ]; then
	echo "Using netboot image: alternate"
	NETBOOT_IMAGE="$NETBOOT_IMAGE_ALT"
else
	echo "Using netboot image: primary"
fi

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

(
	if [ "$ARCH" = sparc ] || [ "$ARCH" = hppa ] || [ "$ARCH" = alpha ]; then
		cp -f "$NETBOOT_IMAGE" $TFTP_DIR/$TFTP_IMAGE
	else
		temp=$(mktemp -d)
		cd $temp
		if ! tar zxf $NETBOOT_IMAGE; then
			error "failed to untar NETBOOT_IMAGE in $temp"
		fi
		find $temp | xargs chmod g+w
		find $temp -type d | xargs chmod g+s
		
		cd $TFTP_DIR
		if ! cp -fr $temp/* .; then
			error "copy to TFTP_DIR failed"
		fi
		rm -rf $temp
	fi
)