clean up copy

chains/chaindata.go

@@ -2,6 +2,7 @@ package chains
 
 import (
 	"errors"
+	"fmt"
 	"io"
 	"os"
 	"path/filepath"
@@ -70,22 +71,16 @@ func copyDir(src, dest string) error {
 		return err
 	}
 
-	srcDir, err := os.Open(src)
-	if err != nil {
-		return err
-	}
-	defer srcDir.Close()
-
-	fileInfos, err := srcDir.Readdir(-1)
+	entries, err := os.ReadDir(src)
 	if err != nil {
 		return err
 	}
 
-	for _, fileInfo := range fileInfos {
-		srcPath := filepath.Join(src, fileInfo.Name())
-		destPath := filepath.Join(dest, fileInfo.Name())
+	for _, entry := range entries {
+		srcPath := filepath.Join(src, entry.Name())
+		destPath := filepath.Join(dest, entry.Name())
 
-		if fileInfo.IsDir() {
+		if entry.IsDir() {
 			if err := copyDir(srcPath, destPath); err != nil {
 				return err
 			}
@@ -112,8 +107,5 @@ func copyFile(src, dest string) error {
 	defer destFile.Close()
 
 	_, err = io.Copy(destFile, srcFile)
-	if err != nil {
-		return err
-	}
-	return nil
+	return err
 }