itest: include compressed btcd backend logs

docs/release-notes/release-notes-0.14.0.md

@@ -161,6 +161,11 @@ you.
   when encoding/decoding messages. Such that most of the heap escapes are fixed,
   resulting in less memory being used when running `lnd`.
 
+## Log system
+
+* [Save compressed log files from logrorate during 
+  itest](https://github.com/lightningnetwork/lnd/pull/5354).
+
 ## Bug Fixes
 
 A bug has been fixed that would cause `lnd` to [try to bootstrap using the

lntest/btcd.go

@@ -6,7 +6,9 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
+	"io/ioutil"
 	"os"
+	"strings"
 
 	"github.com/btcsuite/btcd/btcjson"
 	"github.com/btcsuite/btcd/chaincfg"
@@ -118,15 +120,30 @@ func NewBackend(miner string, netParams *chaincfg.Params) (
 		}
 
 		// After shutting down the chain backend, we'll make a copy of
-		// the log file before deleting the temporary log dir.
+		// the log files, including any compressed log files from
-		logFile := baseLogDir + "/" + netParams.Name + "/btcd.log"
+		// logrorate, before deleting the temporary log dir.
-		logDestination := fmt.Sprintf(
+		logDir := fmt.Sprintf("%s/%s", baseLogDir, netParams.Name)
-			"%s/output_btcd_chainbackend.log", GetLogDir(),
+		files, err := ioutil.ReadDir(logDir)
-		)
-		err := CopyFile(logDestination, logFile)
 		if err != nil {
-			errStr += fmt.Sprintf("unable to copy file: %v\n", err)
+			errStr += fmt.Sprintf(
+				"unable to read log directory: %v\n", err,
+			)
 		}
+
+		for _, file := range files {
+			logFile := fmt.Sprintf("%s/%s", logDir, file.Name())
+			newFilename := strings.Replace(
+				file.Name(), "btcd.log", "output_btcd_chainbackend.log", 1,
+			)
+			logDestination := fmt.Sprintf(
+				"%s/%s", GetLogDir(), newFilename,
+			)
+			err := CopyFile(logDestination, logFile)
+			if err != nil {
+				errStr += fmt.Sprintf("unable to copy file: %v\n", err)
+			}
+		}
+
 		if err = os.RemoveAll(baseLogDir); err != nil {
 			errStr += fmt.Sprintf(
 				"cannot remove dir %s: %v\n", baseLogDir, err,

lntest/node.go

@@ -445,10 +445,11 @@ func newNode(cfg NodeConfig) (*HarnessNode, error) {
 	}, nil
 }
 
-// NewMiner creates a new miner using btcd backend. The logDir specifies the
+// NewMiner creates a new miner using btcd backend. The baseLogDir specifies
-// miner node's log dir. When tests finished, during clean up, its logs are
+// the miner node's log dir. When tests are finished, during clean up, its log
-// copied to a file specified as logFilename.
+// files, including any compressed log files from logrotate, are copied to
-func NewMiner(logDir, logFilename string, netParams *chaincfg.Params,
+// logDir as logFilename.
+func NewMiner(baseLogDir, logFilename string, netParams *chaincfg.Params,
 	handler *rpcclient.NotificationHandlers,
 	btcdBinary string) (*rpctest.Harness, func() error, error) {
 
@@ -458,7 +459,7 @@ func NewMiner(logDir, logFilename string, netParams *chaincfg.Params,
 		"--nowinservice",
 		"--nobanning",
 		"--debuglevel=debug",
-		"--logdir=" + logDir,
+		"--logdir=" + baseLogDir,
 		"--trickleinterval=100ms",
 	}
 
@@ -476,18 +477,32 @@ func NewMiner(logDir, logFilename string, netParams *chaincfg.Params,
 			)
 		}
 
-		// After shutting down the miner, we'll make a copy of the log
+		// After shutting down the miner, we'll make a copy of
-		// file before deleting the temporary log dir.
+		// the log files before deleting the temporary log dir.
-		logFile := fmt.Sprintf("%s/%s/btcd.log", logDir, netParams.Name)
+		logDir := fmt.Sprintf("%s/%s", baseLogDir, netParams.Name)
-		copyPath := fmt.Sprintf("%s/../%s", logDir, logFilename)
+		files, err := ioutil.ReadDir(logDir)
-		err := CopyFile(filepath.Clean(copyPath), logFile)
 		if err != nil {
-			return fmt.Errorf("unable to copy file: %v", err)
+			return fmt.Errorf("unable to read log directory: %v", err)
 		}
 
-		if err = os.RemoveAll(logDir); err != nil {
+		for _, file := range files {
+			logFile := fmt.Sprintf(
+				"%s/%s", logDir, file.Name(),
+			)
+			newFilename := strings.Replace(file.Name(), "btcd.log", logFilename, 1)
+			copyPath := fmt.Sprintf(
+				"%s/../%s", baseLogDir, newFilename,
+			)
+
+			err := CopyFile(filepath.Clean(copyPath), logFile)
+			if err != nil {
+				return fmt.Errorf("unable to copy file: %v", err)
+			}
+		}
+
+		if err = os.RemoveAll(baseLogDir); err != nil {
 			return fmt.Errorf(
-				"cannot remove dir %s: %v", logDir, err,
+				"cannot remove dir %s: %v", baseLogDir, err,
 			)
 		}
 		return nil