lncli: add policy type flags to wtclient policy

cmd/lncli/wtclient.go

@@ -250,19 +250,44 @@ var policyCommand = cli.Command{
 	Name:   "policy",
 	Usage:  "Display the active watchtower client policy configuration.",
 	Action: actionDecorator(policy),
+	Flags: []cli.Flag{
+		cli.BoolFlag{
+			Name: "legacy",
+			Usage: "Retrieve the legacy tower client's current " +
+				"policy. (default)",
+		},
+		cli.BoolFlag{
+			Name:  "anchor",
+			Usage: "Retrieve the anchor tower client's current policy.",
+		},
+	},
 }
 
 func policy(ctx *cli.Context) error {
 	// Display the command's help message if the number of arguments/flags
 	// is not what we expect.
-	if ctx.NArg() > 0 || ctx.NumFlags() > 0 {
+	if ctx.NArg() > 0 || ctx.NumFlags() > 1 {
 		return cli.ShowCommandHelp(ctx, "policy")
 	}
 
+	var policyType wtclientrpc.PolicyType
+	switch {
+	case ctx.Bool("anchor"):
+		policyType = wtclientrpc.PolicyType_ANCHOR
+	case ctx.Bool("legacy"):
+		policyType = wtclientrpc.PolicyType_LEGACY
+
+	// For backwards compatibility with original rpc behavior.
+	default:
+		policyType = wtclientrpc.PolicyType_LEGACY
+	}
+
 	client, cleanUp := getWtclient(ctx)
 	defer cleanUp()
 
-	req := &wtclientrpc.PolicyRequest{}
+	req := &wtclientrpc.PolicyRequest{
+		PolicyType: policyType,
+	}
 	resp, err := client.Policy(context.Background(), req)
 	if err != nil {
 		return err