lncli: add option upfront shutdown to openchannel

cmd/lncli/commands.go

@@ -590,6 +590,12 @@ var openChannelCommand = cli.Command{
 	amount to the remote node as part of the channel opening. Once the channel is open,
 	a channelPoint (txid:vout) of the funding output is returned.
 
+	If the remote peer supports the option upfront shutdown feature bit (query 
+	listpeers to see their supported feature bits), an address to enforce
+	payout of funds on cooperative close can optionally be provided. Note that
+	if you set this value, you will not be able to cooperatively close out to
+	another address.
+
 	One can manually set the fee to be used for the funding transaction via either
 	the --conf_target or --sat_per_byte arguments. This is optional.`,
 	ArgsUsage: "node-key local-amt push-amt",
@@ -659,6 +665,13 @@ var openChannelCommand = cli.Command{
 				"transaction must satisfy",
 			Value: 1,
 		},
+		cli.StringFlag{
+			Name: "close_address",
+			Usage: "(optional) an address to enforce payout of our " +
+				"funds to on cooperative close. Note that if this " +
+				"value is set on channel open, you will *not* be " +
+				"able to cooperatively close to a different address.",
+		},
 	},
 	Action: actionDecorator(openChannel),
 }
@@ -686,6 +699,7 @@ func openChannel(ctx *cli.Context) error {
 		RemoteCsvDelay:   uint32(ctx.Uint64("remote_csv_delay")),
 		MinConfs:         minConfs,
 		SpendUnconfirmed: minConfs == 0,
+		CloseAddress:     ctx.String("close_address"),
 	}
 
 	switch {