Filesystem: also add getPath to \OC\Filesystem

lib/files/filesystem.php

@@ -598,6 +598,18 @@ class Filesystem {
 		return self::$defaultInstance->getDirectoryContent($directory);
 	}
 
+	/**
+	 * Get the path of a file by id
+	 *
+	 * Note that the resulting path is not guarantied to be unique for the id, multiple paths can point to the same file
+	 *
+	 * @param int $id
+	 * @return string
+	 */
+	public static function getPath($id) {
+		return self::$defaultInstance->getPath($id);
+	}
+
 	/**
 	 * get the ETag for a file or folder
 	 *