Mini Shell

#!/usr/bin/sh
# This is a NetworkManager dispatcher / networkd-dispatcher script for
# chronyd to set its NTP sources online or offline when a network interface
# is configured or removed

export LC_ALL=C

chronyc=/usr/bin/chronyc

# For NetworkManager consider only selected events
if [ $# -ge 2 ]; then
    case "$2" in
        up|down|connectivity-change)
            ;;
        dhcp4-change|dhcp6-change)
            # Actions "up" and "connectivity-change" in some cases do not
            # guarantee that the interface has a route (e.g. a bond).
            # dhcp(x)-change handles at least cases that use DHCP.
            ;;
        *)
            exit 0;;
    esac
fi

# Note: for networkd-dispatcher routable.d ~= on and off.d ~= off

$chronyc onoffline > /dev/null 2>&1

exit 0