feature+lncfg: add new CLI flag to opt into taproot chans

feature/manager.go

@@ -35,6 +35,10 @@ type Config struct {
 	// NoWumbo unsets any bits signalling support for wumbo channels.
 	NoWumbo bool
 
+	// NoTaprootChans unsets any bits signaling support for taproot
+	// channels.
+	NoTaprootChans bool
+
 	// NoScriptEnforcementLease unsets any bits signaling support for script
 	// enforced leases.
 	NoScriptEnforcementLease bool
@@ -171,6 +175,10 @@ func newManager(cfg Config, desc setDesc) (*Manager, error) {
 			raw.Unset(lnwire.ShutdownAnySegwitOptional)
 			raw.Unset(lnwire.ShutdownAnySegwitRequired)
 		}
+		if cfg.NoTaprootChans {
+			raw.Unset(lnwire.SimpleTaprootChannelsOptional)
+			raw.Unset(lnwire.SimpleTaprootChannelsRequired)
+		}
 
 		for _, custom := range cfg.CustomFeatures[set] {
 			if custom > set.Maximum() {

lncfg/protocol.go

@@ -22,6 +22,10 @@ type ProtocolOptions struct {
 	// mini.
 	WumboChans bool `long:"wumbo-channels" description:"if set, then lnd will create and accept requests for channels larger chan 0.16 BTC"`
 
+	// TaprootChans should be set if we want to enable support for the
+	// experimental simple taproot chans commitment type.
+	TaprootChans bool `long:"taproot-chans" description:"if set, then lnd will create and accept requests for channels using the simple taproot commitment type"`
+
 	// NoAnchors should be set if we don't want to support opening or accepting
 	// channels having the anchor commitment type.
 	NoAnchors bool `long:"no-anchors" description:"disable support for anchor commitments"`

lncfg/protocol_integration.go

@@ -24,6 +24,10 @@ type ProtocolOptions struct {
 	// mini.
 	WumboChans bool `long:"wumbo-channels" description:"if set, then lnd will create and accept requests for channels larger chan 0.16 BTC"`
 
+	// TaprootChans should be set if we want to enable support for the
+	// experimental simple taproot chans commitment type.
+	TaprootChans bool `long:"taproot-chans" description:"if set, then lnd will create and accept requests for channels using the simple taproot commitment type"`
+
 	// Anchors enables anchor commitments.
 	// TODO(halseth): transition itests to anchors instead!
 	Anchors bool `long:"anchors" description:"enable support for anchor commitments"`

sample-lnd.conf

@@ -1461,6 +1461,9 @@
 ; protocol.no-any-segwit=false
 
 
+; Set to enable support for the experimental taproot channel type.
+; protocol.simple-taproot-chans
+
 [db]
 
 ; The selected database backend. The current default backend is "bolt". lnd

server.go

@@ -542,6 +542,7 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
 		NoZeroConf:               !cfg.ProtocolOptions.ZeroConf(),
 		NoAnySegwit:              cfg.ProtocolOptions.NoAnySegwit(),
 		CustomFeatures:           cfg.ProtocolOptions.ExperimentalProtocol.CustomFeatures(),
+		NoTaprootChans:           !cfg.ProtocolOptions.TaprootChans,
 	})
 	if err != nil {
 		return nil, err