diff --git a/apps/federatedfilesharing/appinfo/info.xml b/apps/federatedfilesharing/appinfo/info.xml
index e4f7777cf249..2a0cbe3cd9da 100644
--- a/apps/federatedfilesharing/appinfo/info.xml
+++ b/apps/federatedfilesharing/appinfo/info.xml
@@ -20,4 +20,7 @@
         <personal>OCA\FederatedFileSharing\Panels\GeneralPersonalPanel</personal>
         <personal>OCA\FederatedFileSharing\Panels\SharingPersonalPanel</personal>
     </settings>
+    <commands>
+    <command>OCA\FederatedFileSharing\Command\SyncIncomingShares</command>
+    </commands>
 </info>
diff --git a/apps/federatedfilesharing/lib/Command/SyncIncomingShares.php b/apps/federatedfilesharing/lib/Command/SyncIncomingShares.php
new file mode 100644
index 000000000000..1c7228f78d7a
--- /dev/null
+++ b/apps/federatedfilesharing/lib/Command/SyncIncomingShares.php
@@ -0,0 +1,86 @@
+<?php
+/**
+ * @author Viktar Dubiniuk <dubiniuk@owncloud.com>
+ *
+ * @copyright Copyright (c) 2018, ownCloud GmbH
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\FederatedFileSharing\Command;
+
+use OCA\Files_Sharing\AppInfo\Application;
+use OCP\Files\StorageNotAvailableException;
+use OCP\IDBConnection;
+use OCP\IUserManager;
+use OCP\Lock\LockedException;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class SyncIncomingShares extends Command {
+	/** @var IDBConnection */
+	private $dbConnection;
+
+	/** @var IUserManager */
+	private $userManager;
+
+	public function __construct(IDBConnection $dbConnection, IUserManager $userManager) {
+		parent::__construct();
+		$this->dbConnection = $dbConnection;
+		$this->userManager = $userManager;
+	}
+
+	protected function configure() {
+		$this
+			->setName('incomingShares:sync')
+			->setDescription('Sync external shares');
+	}
+
+	public function execute(InputInterface $input, OutputInterface $output) {
+		$app = new Application();
+		/** @var \OCA\Files_Sharing\External\MountProvider $mountProvider */
+		$mountProvider = $app->getContainer()->query('ExternalMountProvider');
+		$loader = \OC\Files\Filesystem::getLoader();
+
+		$qb = $this->dbConnection->getQueryBuilder();
+		$qb->selectDistinct('user')
+			->from('share_external')
+			->where($qb->expr()->eq('accepted', $qb->expr()->literal('1')));
+		$cursor = $qb->execute();
+		while ($data = $cursor->fetch()) {
+			$user = $this->userManager->get($data['user']);
+			$userMounts = $mountProvider->getMountsForUser($user, $loader);
+			foreach ($userMounts as $mount) {
+				/** @var \OCA\Files_Sharing\External\Storage $storage */
+				$storage = $mount->getStorage();
+				try {
+					$localMtime = $storage->filemtime('');
+					if ($storage->hasUpdated('', $localMtime)) {
+						// sync
+						try {
+							$storage->getScanner('')->scan('', false, 0);
+						} catch (LockedException $e) {
+							// it can be locked, let's skip it then
+						}
+					}
+				} catch (StorageNotAvailableException $e) {
+					// pass
+				}
+			}
+		}
+		$cursor->closeCursor();
+	}
+}