@@ -1,7 +1,21 @@

 #!/usr/bin/env bash

 set -e

+mkimgdeb="$(basename "$0")"

+mkimg="$(dirname "$0").sh"

+

+usage() {

+	echo >&2 "usage: $mkimgdeb rootfsDir suite [debootstrap-args]"

+	echo >&2 " note: $mkimgdeb meant to be used from $mkimg"

+	exit 1

+}

+

 rootfsDir="$1"

+if [ -z "$rootfsDir" ]; then

+	echo >&2 "error: rootfsDir is missing"

+	echo >&2

+	usage

+fi

 shift

 # we have to do a little fancy footwork to make sure "rootfsDir" becomes the second non-option argument to debootstrap

@@ -13,10 +27,21 @@ while [ $# -gt 0 ] && [[ "$1" == -* ]]; do

 done

 suite="$1"

+if [ -z "$suite" ]; then

+	echo >&2 "error: suite is missing"

+	echo >&2

+	usage

+fi

 shift

 # get path to "chroot" in our current PATH

-chrootPath="$(type -P chroot)"

+chrootPath="$(type -P chroot || :)"

+if [ -z "$chrootPath" ]; then

+	echo >&2 "error: chroot not found. Are you root?"

+	echo >&2

+	usage

+fi

+

 rootfs_chroot() {

 	# "chroot" doesn't set PATH, so we need to set it explicitly to something our new debootstrap chroot can use appropriately!