archbuild-dl: use getopts to specify arguments

arch_regexp="($(uname -m)|any)"

usage() {

	echo "usage: ${0##*/} <list|get|install> [pkg_regex] [arch_regexp] [pkg_base] [pkg_host]" >&2

	echo 'default:'

	echo "   pkg_host: $pkg_host"

	echo "   pkg_regex: $pkg_regex"

	echo "   pkg_base: $pkg_base"

	echo "   arch_regex: $arch_regexp"

	echo "usage: ${0##*/} [options] <list|get|install> [pkg_regex]" >&2

	echo 'options:'

	echo "   -h: host address (current: $pkg_host)"

	echo "   -b: base path (current: $pkg_base)"

	echo "   -a: arch regex (current: $arch_regexp)"

	exit 1

}

while getopts 'h:b:a:' opt; do

	case $opt in

		a) arch_regexp=$OPTARG;;

		b) pkg_base=$OPTARG;;

		h) pkg_host=$OPTARG;;

		*) usage;;

	esac

done

shift $((OPTIND - 1));

(( $# >= 1 )) || usage

case $1 in

	*) usage;;

esac

[[ -n "$2" ]] && pkg_regex=$2

[[ -n "$3" ]] && arch_regexp=$3

[[ -n "$4" ]] && pkg_base=$4

[[ -n "$5" ]] && pkg_host=$5

list_tmp=$(mktemp)

ssh "$pkg_host" \

"find '$pkg_base' -type f \