feat: Network mode detection (#857)

    error "$ADD_ERR -e \"VM_NET_DEV=NAME\" to specify another interface name." && exit 26

  fi

  NIC=$(ethtool -i "$VM_NET_DEV" | grep -m 1 -i 'driver:' | awk '{print $(2)}')

  local result nic bus

  result=$(ethtool -i "$VM_NET_DEV")

  nic=$(grep -m 1 -i 'driver:' <<< "$result" | awk '{print $(2)}')

  bus=$(grep -m 1 -i 'bus-info:' <<< "$result" | awk '{print $(2)}')

  if [[ "${bus,,}" != "" && "${bus,,}" != "n/a" ]]; then

    [[ "$DEBUG" == [Yy1]* ]] && info "Detected BUS: $bus"

    error "This container does not support host mode networking!"

    exit 29

  fi

  if [[ "$DHCP" == [Yy1]* ]]; then

    if [[ "${nic,,}" == "ipvlan" ]]; then

      error "This container does not support IPVLAN networking when DHCP=Y."

      exit 29

    fi

    if [[ "${nic,,}" != "macvlan" ]]; then

      [[ "$DEBUG" == [Yy1]* ]] && info "Detected NIC: $nic"

      error "The container needs to be in a MACVLAN network when DHCP=Y."

      exit 29

    fi

  if [[ "${NIC,,}" != "veth" && "${NIC,,}" != "macvlan" ]]; then

    [[ "$DEBUG" == [Yy1]* ]] && info "Detected NIC: $NIC"

    error "This container does not support host mode networking!" && exit 29

  fi

  BASE_IP="${VM_NET_IP%.*}."

  checkOS

  if [[ "$IP" == "172."* ]]; then

    warn "container IP starts with 172.* which is often a sign that you are not on a macvlan network (required for DHCP)!"

  fi

  # Configure for macvtap interface

  configureDHCP || exit 20