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diff --git a/apps/files_external/3rdparty/icewind/smb/src/ISystem.php b/apps/files_external/3rdparty/icewind/smb/src/ISystem.php
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+++ b/apps/files_external/3rdparty/icewind/smb/src/ISystem.php
@@ -0,0 +1,71 @@
+<?php
+/**
+ * @copyright Copyright (c) 2018 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Icewind\SMB;
+
+/**
+ * The `ISystem` interface provides a way to access system dependent information
+ * such as the availability and location of certain binaries.
+ */
+interface ISystem {
+	/**
+	 * Get the path to a file descriptor of the current process
+	 *
+	 * @param int $num the file descriptor id
+	 * @return string
+	 */
+	public function getFD($num);
+
+	/**
+	 * Get the full path to the `smbclient` binary of false if the binary is not available
+	 *
+	 * @return string|bool
+	 */
+	public function getSmbclientPath();
+
+	/**
+	 * Get the full path to the `net` binary of false if the binary is not available
+	 *
+	 * @return string|bool
+	 */
+	public function getNetPath();
+
+	/**
+	 * Get the full path to the `stdbuf` binary of false if the binary is not available
+	 *
+	 * @return string|bool
+	 */
+	public function getStdBufPath();
+
+	/**
+	 * Get the full path to the `date` binary of false if the binary is not available
+	 *
+	 * @return string|bool
+	 */
+	public function getDatePath();
+
+	/**
+	 * Whether or not the smbclient php extension is enabled
+	 *
+	 * @return bool
+	 */
+	public function libSmbclientAvailable();
+}