move parent check outside of readMACFromFile

pkg/sysfsnet/interfaces_linux.go

@@ -24,20 +24,6 @@ func Interfaces() ([]Interface, error) {
 
 	readMACFromFile := func(s string) (string, error) {
 
-		// Check if parent exists and is a directory
-		// parent := filepath.Dir(s)
-		// info, err := os.Stat(parent)
-		// if err != nil {
-		// 	if os.IsNotExist(err) {
-		// 		return "", nil
-		// 	}
-		// 	return "", err
-		// }
-
-		// if !info.IsDir() {
-		// 	return "", nil
-		// }
-
 		f, err := os.Open(s)
 
 		if os.IsNotExist(err) {
@@ -56,11 +42,20 @@ func Interfaces() ([]Interface, error) {
 
 	for _, dentry := range dents {
 
-		if !dentry.IsDir() {
+		entryPath := filepath.Join(sysClassNet, dentry.Name())
+
+		// os.Stat to follow symlinks and return the info of the target
+		info, err := os.Stat(entryPath)
+		if err != nil {
+			continue
+		}
+
+		// os.FileInfo.IsDir to check if the entry is a directory
+		if !info.IsDir() {
 			continue
 		}
 
-		hwText, err := readMACFromFile(filepath.Join(sysClassNet, dentry.Name(), "address"))
+		hwText, err := readMACFromFile(filepath.Join(entryPath, "address"))
 		if os.IsNotExist(err) {
 			continue
 		}