fix chmod for read only files

pkg/minikube/command/command_runner.go

@@ -209,5 +209,10 @@ func writeFile(dst string, f assets.CopyableFile, perms os.FileMode) error {
 	if n != int64(f.GetLength()) {
 		return fmt.Errorf("%s: expected to write %d bytes, but wrote %d instead", dst, f.GetLength(), n)
 	}
+
+	if err := w.Chmod(os.FileMode(perms)); err != nil {
+		return errors.Wrap(err, "chmod")
+	}
+
 	return w.Close()
 }

pkg/minikube/command/exec_runner.go

@@ -166,11 +166,6 @@ func (e *execRunner) Copy(f assets.CopyableFile) error {
 		}
 		defer os.Remove(tmpfile.Name())
 
-		// ... set the file permission ...
-		if err := tmpfile.Chmod(os.FileMode(perms)); err != nil {
-			return errors.Wrap(err, "error setting file permissions")
-		}
-
 		if err := writeFile(tmpfile.Name(), f, os.FileMode(perms)); err != nil {
 			return errors.Wrapf(err, "error writing to tempfile %s", tmpfile.Name())
 		}