cmd/lncli: add confirmation promt to closeallchannels

To make sure users don't accidentally close all channels, we ask before
running this potentially very destructive command.

Author: guggero

cmd/lncli/commands.go

@@ -994,6 +994,11 @@ var closeAllChannelsCommand = cli.Command{
 				"sat/vbyte that should be used when crafting " +
 				"the closing transactions",
 		},
+		cli.BoolFlag{
+			Name: "s, skip_confirmation",
+			Usage: "Skip the confirmation prompt and close all " +
+				"channels immediately",
+		},
 	},
 	Action: actionDecorator(closeAllChannels),
 }
@@ -1012,6 +1017,11 @@ func closeAllChannels(ctx *cli.Context) error {
 		return err
 	}
 
+	prompt := "Do you really want to close ALL channels? (yes/no): "
+	if !ctx.Bool("skip_confirmation") && !promptForConfirmation(prompt) {
+		return errors.New("action aborted by user")
+	}
+
 	listReq := &lnrpc.ListChannelsRequest{}
 	openChannels, err := client.ListChannels(ctxc, listReq)
 	if err != nil {