its-ap-builder/files/common/its/etc/hotplug.d/iface/10-disable-wifi-when-uplink-gone

#!/bin/sh


uci_set_forall_wifi_ifaces () {
    WIFI_IFACES=$(uci show wireless | sed -nr 's/^wireless\.([^=]+)=wifi-iface*$/\1/p')
    for iface in $WIFI_IFACES; do
        uci set wireless.$iface."$1"
    done
}

logger -t wifi-uplink hotplug "$DEVICE" "$INTERFACE" "$ACTION"

# 'lan' doesn't work for some reason
[ "$INTERFACE" = apctl ] || exit 0

logger -t wifi-uplink devchange "$DEVICE" "$INTERFACE" "$ACTION"

[ "$ACTION" = ifup ] && {
    logger -t wifi-uplink up "$DEVICE" "$INTERFACE" "$ACTION"
    uci_set_forall_wifi_ifaces disabled=0
    wifi
}

[ "$ACTION" = ifdown ] && {
    logger -t wifi-uplink down "$DEVICE" "$INTERFACE" "$ACTION"
    wifi down
    uci_set_forall_wifi_ifaces disabled=1
}