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/etc/init/network-interface-container.conf is in ifupdown 0.7.47.2ubuntu4.

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# network-interface-container - woarkound for missing events in container
#
# This service emits missing net-device-added events for containers.
# It's needed in cases where devices are created before the container
# starts and so won't get a udev event.

description "workaround for missing events in container"
start on container

emits net-device-added

task
script
    case "$CONTAINER" in
        lxc|lxc-libvirt|openvz)
            initctl emit --no-wait net-device-added INTERFACE=lo || true
        ;;
    esac
end script