Improve locating file descriptors and smbclient/net commands

src/System.php

@@ -0,0 +1,43 @@
+<?php
+/**
+ * Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Licensed under the MIT license:
+ * http://opensource.org/licenses/MIT
+ */
+
+namespace Icewind\SMB;
+
+use Icewind\SMB\Exception\Exception;
+
+class System {
+	private $smbclient;
+
+	private $net;
+
+	public static function getFD($num) {
+		$folders = [
+			'/proc/self/fd',
+			'/dev/fd'
+		];
+		foreach ($folders as $folder) {
+			if (file_exists($folder)) {
+				return $folder . '/' . $num;
+			}
+		}
+		throw new Exception('Cant find file descriptor path');
+	}
+
+	public function getSmbclientPath() {
+		if (!$this->smbclient) {
+			$this->smbclient = trim(`which smbclient`);
+		}
+		return $this->smbclient;
+	}
+
+	public function getNetPath() {
+		if (!$this->net) {
+			$this->net = trim(`which net`);
+		}
+		return $this->net;
+	}
+}