softflowd/debian/softflowd-generator

#!/bin/sh

set -eu

service_file="/lib/systemd/system/softflowd@.service"
want_dir="$1/softflowd.service.wants"

config_dir=/etc/softflowd/

if [ -d "$config_dir" ]; then
    mkdir -p "$want_dir"
    cd "$config_dir"
    for config in *.conf; do
        [ -f "$config" ] || continue
        instance="$(systemd-escape "${config%%.conf}")"
        link="$want_dir/softflowd@$instance.service"

        sh -n "$config_dir$config" 2>/dev/null || continue

        interface=

        . "$config_dir$config"

        [ "$interface" ] || continue

        ln -s "$service_file" "$link"
    done
fi

exit 0