gistfile1.txt

    public function chownRecursive($uid = -1, $gid = -1) {
        $deferred = new Deferred();

        $this->ls()->then(function($list) use ($deferred, $uid, $gid) {
            $this->filesystem->getLoop()->futureTick(function() use ($list, $deferred, $uid, $gid) {
                $promises = [];

                foreach ($list as $node) {
                    if ($node instanceof Directory) {
                        $promises[] = $node->chownRecursive($uid, $gid);
                    } else {
                        $promises[] = $node->chown($uid, $gid);
                    }
                }

                \React\Promise\all($promises)->then(function() use ($deferred, $uid, $gid) {
                    $this->chown($uid, $gid)->then(function() use ($deferred) {
                        $deferred->resolve();
                    });
                });
            });
        });

        return $deferred->promise();
    }