adding mgmt dhcp6 - so we get ntp and dns over ipv6 - and timesyncd dhcp6 exit script

debian/wit-network-config.install

@@ -12,9 +12,10 @@ files/qemu-ifup etc/libvirt/hooks
 files/firewall etc/init.d
 files/ips.issue etc/issue.d
 files/wit-logging.conf etc/strongswan.d
-files/lldpd.wit /etc/default
+files/lldpd.wit etc/default
+files/timesyncd6 etc/dhcp/dhclient-exit-hooks.d
 templates/wit-swanctl.conf etc/swanctl/conf.d
 templates/frr.conf.wit etc/frr
 templates/70-persistent-net.rules etc/udev/rules.d
-templates/interfaces /etc/network
+templates/interfaces etc/network
 templates/ipsec.conf.wit etc

debian/wit-network-config.postinst

@@ -213,11 +213,12 @@ case "$1" in
                 cat <<-EOF >>$IFCONFIG
 			auto $ifname
 			iface $ifname inet6 auto
-			iface $ifname inet dhcp
 			    pre-up /bin/ip link add mgmt type vrf table mgmt
 			    pre-up /bin/ip link set up dev mgmt
 			    pre-up /bin/ip link set master mgmt dev $ifname
 			    post-down /bin/ip link del dev mgmt
+			iface $ifname inet6 dhcp
+			iface $ifname inet dhcp
 
 
 		EOF

files/timesyncd6

@@ -0,0 +1,42 @@
+TIMESYNCD_CONF=/run/systemd/timesyncd.conf.d/01-dhclient6.conf
+
+timesyncd_servers_setup_remove() {
+        if [ -e $TIMESYNCD_CONF ]; then
+            rm -f $TIMESYNCD_CONF
+            systemctl try-restart systemd-timesyncd.service || true
+        fi
+}
+
+timesyncd_servers_setup_add() {
+        if [ ! -d /run/systemd/system ]; then
+                return
+        fi
+
+        if [ -e $TIMESYNCD_CONF ] && [ "$new_dhcp6_sntp_servers" = "$old_dhcp6_sntp_servers" ]; then
+                return
+        fi
+
+        if [ -z "$new_dhcp6_sntp_servers" ]; then
+                timesyncd_servers_setup_remove
+                return
+        fi
+
+        mkdir -p $(dirname $TIMESYNCD_CONF)
+        cat <<EOF > ${TIMESYNCD_CONF}.new
+# NTP server entries received from DHCP server
+[Time]
+NTP=$new_dhcp6_sntp_servers
+EOF
+        mv ${TIMESYNCD_CONF}.new ${TIMESYNCD_CONF}
+        systemctl try-restart systemd-timesyncd.service || true
+}
+
+
+case $reason in
+        BOUND|BOUND6|RENEW|RENEW6|REBIND|REBIND6|REBOOT|REBOOT6)
+                timesyncd_servers_setup_add
+                ;;
+        EXPIRE|EXPIRE6|FAIL|FAIL6|RELEASE|RELEASE6|STOP|STOP6)
+                timesyncd_servers_setup_remove
+                ;;
+esac