openwrt:/etc/hotplug.d/iface/01-dhcp-hostname

gistfile1.txt

log () {
    logger -p user.info -t ifup "/etc/hotplug.d/iface/01-dhcp-hostname: $*"
}

if [ ifup = "$ACTION" -a dhcp = "$PROTO" ]; then
    hostname=$(uci_get system '@system[0]' hostname '')
    lease_hostname=$(uci_get_state network "$INTERFACE" lease_hostname '')
    
    if [ -n "$lease_hostname" ]; then
        log "hostname: $lease_hostname"

        echo "$lease_hostname" > /proc/sys/kernel/hostname
        
        # set persistently?
        case "$hostname" in
            $lease_hostname)

            ;;

            *-test)
                log "commit uci system hostname: $lease_hostname"

                uci_set system '@system[0]' hostname "$lease_hostname"
                uci_commit
            
                # hooks
                service collectd restart
            ;;

            *)

            ;;
        esac
    fi
fi