add simple auto-update mechanism

departure.sh

@@ -258,10 +258,24 @@ print_cvag_schedule()
 	fi
 }
 
+update_script()
+{
+	cd "$(dirname "$0")"
+	if [ -d ".git" ]; then
+		git pull >/dev/null || sleep 10
+		exec ./$(basename -- "$0") "skip_first_update"
+	fi
+}
+
 draw_large_logo
-sleep 5
+SKIP_UPDATE="$1"
+[ "$SKIP_UPDATE" = "skip_first_update" ] && sleep 10
+ROUND_COUNT=0
 while true; do
+	[ $ROUND_COUNT -eq 0 -a ! "$SKIP_UPDATE" = "skip_first_update" ] && update_script
+	SKIP_UPDATE=""
 	print_cvag_schedule
+	ROUND_COUNT=$((($ROUND_COUNT + 1) % 60))
 	sleep 10
 done