match network to host when multiple networks are found

builder/vsphere/driver/network.go

@@ -31,6 +31,21 @@ func (d *Driver) FindNetwork(name string) (*Network, error) {
 	}, nil
 }
 
+func (d *Driver) FindNetworks(name string) ([]*Network, error) {
+	ns, err := d.finder.NetworkList(d.ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	var networks []*Network
+	for _, n := range ns {
+		networks = append(networks, &Network{
+			network: n,
+			driver:  d,
+		})
+	}
+	return networks, nil
+}
+
 func (n *Network) Info(params ...string) (*mo.Network, error) {
 	var p []string
 	if len(params) == 0 {
@@ -51,3 +66,12 @@ func (n *Network) Info(params ...string) (*mo.Network, error) {
 	}
 	return &info, nil
 }
+
+type MultipleNetworkFoundError struct {
+	path   string
+	append string
+}
+
+func (e *MultipleNetworkFoundError) Error() string {
+	return fmt.Sprintf("path '%s' resolves to multiple networks. %s", e.path, e.append)
+}

builder/vsphere/driver/vm.go

@@ -753,11 +753,35 @@ func addNetwork(d *Driver, devices object.VirtualDeviceList, config *CreateConfi
 func findNetwork(network string, host string, d *Driver) (object.NetworkReference, error) {
 	if network != "" {
 		var err error
-		network, err := d.finder.Network(d.ctx, network)
+		networks, err := d.FindNetworks(network)
 		if err != nil {
 			return nil, err
 		}
-		return network, nil
+		if len(networks) == 1 {
+			return networks[0].network, nil
+		}
+
+		// If there are multiple networks then try to match the host
+		if host != "" {
+			h, err := d.FindHost(host)
+			if err != nil {
+				return nil, &MultipleNetworkFoundError{network, fmt.Sprintf("unable to match a network to the host %s: %s", host, err.Error())}
+			}
+			for _, n := range networks {
+				info, err := n.Info("host")
+				if err != nil {
+					continue
+				}
+				for _, host := range info.Host {
+					if h.host.Reference().Value == host.Reference().Value {
+						return n.network, nil
+					}
+				}
+			}
+			return nil, &MultipleNetworkFoundError{network, fmt.Sprintf("unable to match a network to the host %s", host)}
+		}
+
+		return nil, &MultipleNetworkFoundError{network, "please provide a host to match or the network full path"}
 	}
 
 	if host != "" {