docker-ferment-wrapper.j2

#!/usr/bin/env bash

# {{ ansible_managed }}

script="/usr/local/bin/ferment"
interface="${1:-docker0}"

if [ -x ${script} ] ; then

    if ip link show "${interface}" > /dev/null 2>&1 ; then

        # Check if we are running under systemd
        if pidof systemd > /dev/null 2>&1 ; then

            if [ "$(systemctl is-active docker.service)" == "active" ] ; then
                ${script} docker -i "${interface}" -c "$(ip address show dev "${interface}" scope global | grep inet | awk '{print $2}')" config
            fi

        else

            # I'm not sure if that's a good way to check for running Docker under
            # non-systemd systems, if there are issues please provide a better solution
            if [ -r /var/run/docker/metrics.sock ] ; then
                ${script} docker -i "${interface}" -c "$(ip address show dev "${interface}" scope global | grep inet | awk '{print $2}')" config
            fi

        fi
    fi
fi