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#!/bin/sh
# This is a NetworkManager dispatcher script for chronyd to update
# its NTP sources passed from DHCP options. Note that this script is
# specific to NetworkManager-dispatcher due to use of the
# DHCP4_NTP_SERVERS environment variable.
export LC_ALL=C
interface=$1
action=$2
chronyc=/usr/bin/chronyc
default_server_options=iburst
server_dir=/var/run/chrony-dhcp
dhcp_server_file=$server_dir/$interface.sources
# DHCP4_NTP_SERVERS is passed from DHCP options by NetworkManager.
nm_dhcp_servers=$DHCP4_NTP_SERVERS
add_servers_from_dhcp() {
rm -f "$dhcp_server_file"
for server in $nm_dhcp_servers; do
echo "server $server $default_server_options" >> "$dhcp_server_file"
done
$chronyc reload sources > /dev/null 2>&1 || :
}
clear_servers_from_dhcp() {
if [ -f "$dhcp_server_file" ]; then
rm -f "$dhcp_server_file"
$chronyc reload sources > /dev/null 2>&1 || :
fi
}
mkdir -p $server_dir
if [ "$action" = "up" ] || [ "$action" = "dhcp4-change" ]; then
add_servers_from_dhcp
elif [ "$action" = "down" ]; then
clear_servers_from_dhcp
fi
exit 0
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