fix incompatible file type checking on Windows

pkg/util/mount/mount.go

@@ -19,6 +19,7 @@ limitations under the License.
 package mount
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
@@ -337,3 +338,37 @@ func startsWithBackstep(rel string) bool {
 	// normalize to / and check for ../
 	return rel == ".." || strings.HasPrefix(filepath.ToSlash(rel), "../")
 }
+
+// getFileType checks for file/directory/socket and block/character devices
+func getFileType(pathname string) (FileType, error) {
+	var pathType FileType
+	info, err := os.Stat(pathname)
+	if os.IsNotExist(err) {
+		return pathType, fmt.Errorf("path %q does not exist", pathname)
+	}
+	// err in call to os.Stat
+	if err != nil {
+		return pathType, err
+	}
+
+	// checks whether the mode is the target mode
+	isSpecificMode := func(mode, targetMode os.FileMode) bool {
+		return mode&targetMode == targetMode
+	}
+
+	mode := info.Mode()
+	if mode.IsDir() {
+		return FileTypeDirectory, nil
+	} else if mode.IsRegular() {
+		return FileTypeFile, nil
+	} else if isSpecificMode(mode, os.ModeSocket) {
+		return FileTypeSocket, nil
+	} else if isSpecificMode(mode, os.ModeDevice) {
+		if isSpecificMode(mode, os.ModeCharDevice) {
+			return FileTypeCharDev, nil
+		}
+		return FileTypeBlockDev, nil
+	}
+
+	return pathType, fmt.Errorf("only recognise file, directory, socket, block device and character device")
+}