CraftCli\Support\DirectoryHelper::verifyDirectoryIsWritable PHP Method

    public function verifyDirectoryIsWritable($path, $label = 'path')
    {
        $this->verifyDirectoryIsReadable($path, $label);
        if (!is_writable($path)) {
            throw new Exception(sprintf('Could not write the %s at %s', $label, $path));
        }
    }