bundles/pppd: add systemd-timer to automatically update dyndns

bundles/pppd/files/dyndns_periodic

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+[[ -n "$DEBUG" ]] && set -x
+
+interface="$(ip link show | awk '/ ppp/ {print substr($2, 1, length($2)-1)}')"
+addr="$(ip addr show dev "$interface" | awk '/inet / {print $2}')"
+resolved="$(dig +short "${domain}" A)"
+
+if [[ -z "$addr" ]] || [[ -z "$resolved" ]]
+then
+    echo "Something is wrong:"
+    echo "Address on '$interface' is '$addr'"
+    echo "Resolved DNS is '$resolved'"
+elif [[ "$addr" != "$resolved" ]]
+then
+    /etc/ppp/ip-up.d/dyndns "$interface" "doesnt" "matter" "$addr"
+fi

bundles/pppd/files/dyndns_periodic.service

@@ -0,0 +1,5 @@
+[Unit]
+Description=dyndns periodic checker and updater
+
+[Service]
+ExecStart=/usr/local/bin/dyndns_periodic

bundles/pppd/files/dyndns_periodic.timer

@@ -0,0 +1,8 @@
+[Unit]
+Description=run dyndns periodic checker and updater
+
+[Timer]
+OnCalendar=*:0/5
+
+[Install]
+WantedBy=timers.target