systemd/systemd-sysv-install

#!/bin/sh
set -e

usage() {
	echo "Usage: $0 [--root=path] enable|disable|is-enabled <sysv script name>" >&2
	exit 1
}
eval set -- "$(getopt -o r: --long root: -- "$@")"
while true; do
	case "$1" in
		-r|--root)
			ROOT="$2"
			shift 2 ;;
		--) shift ; break ;;
		*) usage ;;
	esac
done
NAME="$2"
ROOT="${ROOT:+--root=$ROOT}"
[ -n "$NAME" ] || usage
case "$1" in
	enable) chkconfig $ROOT -a "$NAME" ;;
	disable) chkconfig $ROOT -d "$NAME" ;;
	is-enabled) chkconfig $ROOT -t "$NAME" ;;
	*) usage ;;
esac