added installation command (#838)

src/Utils/File.php

@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Utils;
+
+use Symfony\Component\Filesystem\Exception\FileNotFoundException;
+
+class File
+{
+    /**
+     * @param string $filename
+     * @return int
+     * @throws FileNotFoundException
+     */
+    public function getPermissions(string $filename): int
+    {
+        if (!file_exists($filename)) {
+            throw new FileNotFoundException(sprintf('Unknown file "%s"', $filename));
+        }
+
+        return fileperms($filename);
+    }
+}