multi: add testnet4 support

lncfg/chain.go

@@ -17,6 +17,7 @@ type Chain struct {
 
 	MainNet         bool     `long:"mainnet" description:"Use the main network"`
 	TestNet3        bool     `long:"testnet" description:"Use the test network"`
+	TestNet4        bool     `long:"testnet4" description:"Use the testnet4 test network"`
 	SimNet          bool     `long:"simnet" description:"Use the simulation test network"`
 	RegTest         bool     `long:"regtest" description:"Use the regression test network"`
 	SigNet          bool     `long:"signet" description:"Use the signet test network"`

lncfg/config.go

@@ -108,6 +108,14 @@ func CleanAndExpandPath(path string) string {
 // NormalizeNetwork returns the common name of a network type used to create
 // file paths. This allows differently versioned networks to use the same path.
 func NormalizeNetwork(network string) string {
+	// The 4th testnet isn't the "default" yet, so we'll want to explicitly
+	// point that to a "testnet4" directory.
+	if network == "testnet4" {
+		return network
+	}
+
+	// We want to collapse "testnet3" and "testnet" to the same "testnet"
+	// directory.
 	if strings.HasPrefix(network, "testnet") {
 		return "testnet"
 	}