cmd/mesh-controller/rollout.go

@@ -243,11 +243,24 @@ func rolloutMint(ctx context.Context) error {
 	if err != nil {
 		return err
 	}
-	if onNetwork[busNode] == "" {
-		return fmt.Errorf("%s runs the new bus and has no address on the private network, so no machine "+
-			"could be told where it is", busNode)
+	busHost := onNetwork[busNode]
+	if busHost == "" {
+		// **The hub is not in that map.** The machine that took over the tunnel is where the current
+		// bus already answers, and every machine dials it at the address the mesh handed them — so
+		// when the new bus runs on the same machine, that address is the one to tell them, with the
+		// new port. Found live: the control node is the hub, and the map lists the machines placed
+		// around it.
+		host := strings.TrimSpace(broker.BareAddress(known.Address))
+		if i := strings.LastIndex(host, ":"); i > 0 && !strings.Contains(host[i:], "]") {
+			host = host[:i]
+		}
+		if host == "" {
+			return fmt.Errorf("%s runs the new bus and has no address on the private network, and the "+
+				"current bus's address is unknown too, so no machine could be told where it is", busNode)
+		}
+		busHost = host
 	}
-	busAddress := onNetwork[busNode] + ":4222"
+	busAddress := busHost + ":4222"
 
 	records, err := inv.BusRecords(ctx)
 	if err != nil {