Merge pull request #9278 from starius/debuglevel-show-no-checks

config: fix "lnd --debuglevel show" command

config.go

@@ -860,6 +860,18 @@ func LoadConfig(interceptor signal.Interceptor) (*Config, error) {
 func ValidateConfig(cfg Config, interceptor signal.Interceptor, fileParser,
 	flagParser *flags.Parser) (*Config, error) {
 
+	// Special show command to list supported subsystems and exit.
+	if cfg.DebugLevel == "show" {
+		subLogMgr := build.NewSubLoggerManager()
+
+		// Initialize logging at the default logging level.
+		SetupLoggers(subLogMgr, interceptor)
+
+		fmt.Println("Supported subsystems",
+			subLogMgr.SupportedSubsystems())
+		os.Exit(0)
+	}
+
 	// If the provided lnd directory is not the default, we'll modify the
 	// path to all of the files and directories that will live within it.
 	lndDir := CleanAndExpandPath(cfg.LndDir)
@@ -1249,7 +1261,7 @@ func ValidateConfig(cfg Config, interceptor signal.Interceptor, fileParser,
 	// The target network must be provided, otherwise, we won't
 	// know how to initialize the daemon.
 	if numNets == 0 {
-		str := "either --bitcoin.mainnet, or bitcoin.testnet," +
+		str := "either --bitcoin.mainnet, or bitcoin.testnet, " +
 			"bitcoin.simnet, bitcoin.regtest or bitcoin.signet " +
 			"must be specified"
 
@@ -1408,13 +1420,6 @@ func ValidateConfig(cfg Config, interceptor signal.Interceptor, fileParser,
 	// Initialize logging at the default logging level.
 	SetupLoggers(cfg.SubLogMgr, interceptor)
 
-	// Special show command to list supported subsystems and exit.
-	if cfg.DebugLevel == "show" {
-		fmt.Println("Supported subsystems",
-			cfg.SubLogMgr.SupportedSubsystems())
-		os.Exit(0)
-	}
-
 	if cfg.MaxLogFiles != 0 {
 		if cfg.LogConfig.File.MaxLogFiles !=
 			build.DefaultMaxLogFiles {

itest/config.go

@@ -0,0 +1,28 @@
+//go:build integration
+
+package itest
+
+import (
+	"os/exec"
+
+	"github.com/lightningnetwork/lnd/lntest"
+	"github.com/stretchr/testify/require"
+)
+
+// testDebuglevelShow tests that "lnd --debuglevel=show" command works and
+// prints the list of supported subsystems.
+func testDebuglevelShow(ht *lntest.HarnessTest) {
+	// We can't use ht.NewNode, because it adds more arguments to the
+	// command line (e.g. flags configuring bitcoin backend), but we want to
+	// make sure that "lnd --debuglevel=show" works without any other flags.
+	lndBinary := getLndBinary(ht.T)
+	cmd := exec.Command(lndBinary, "--debuglevel=show")
+	stdoutStderrBytes, err := cmd.CombinedOutput()
+	require.NoError(ht, err, "failed to run 'lnd --debuglevel=show'")
+
+	// Make sure that the output contains the list of supported subsystems
+	// and that the list is not empty. We search PEER subsystem.
+	stdoutStderr := string(stdoutStderrBytes)
+	require.Contains(ht, stdoutStderr, "Supported subsystems")
+	require.Contains(ht, stdoutStderr, "PEER")
+}

itest/list_on_test.go

@@ -702,4 +702,8 @@ var allTestCases = []*lntest.TestCase{
 		Name:     "send to route failed htlc timeout",
 		TestFunc: testSendToRouteFailHTLCTimeout,
 	},
+	{
+		Name:     "debuglevel show",
+		TestFunc: testDebuglevelShow,
+	},
 }