softflowd/debian/softflowd-generator

#!/bin/sh

set -eu

SERVICEFILE="/lib/systemd/system/softflowd@.service"
WANTDIR="$1/softflowd.service.wants"

CONFIG_DIR=/etc/softflowd/

if [ -d "$CONFIG_DIR" ] ; then
    mkdir -p "$WANTDIR"
    cd "$CONFIG_DIR"
    for CONFIG in *.conf ; do
        [ -f "$CONFIG" ] || continue
        INSTANCE="$(systemd-escape "${CONFIG%%.conf}")"
        LINK="$WANTDIR/softflowd@$INSTANCE.service"

        sh -n "$CONFIG_DIR$CONFIG" 2>/dev/null || continue

        interface=
        options=

        . "$CONFIG_DIR$CONFIG"

        [ "$interface" ] || continue

        ln -s "$SERVICEFILE" "$LINK"
    done
fi

exit 0