Added "USB backup" function

plugins/dynamix/scripts/usb_backup

@@ -0,0 +1,43 @@
+#!/usr/bin/php -q
+<?PHP
+/* Copyright 2005-2017, Lime Technology
+ * Copyright 2012-2017, Bergware International.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2,
+ * as published by the Free Software Foundation.
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ */
+?>
+<?
+$docroot = $docroot ?: $_SERVER['DOCUMENT_ROOT'] ?: '/usr/local/emhttp';
+$var = file_exists('/var/local/emhttp/var.ini') ? parse_ini_file('/var/local/emhttp/var.ini') : [];
+$out = ['previous','syslinux'];
+
+$server = isset($var['NAME']) ? str_replace(' ','_',strtolower($var['NAME'])) : 'tower';
+$mydate = date('Ymd-Hi');
+$backup = "$server-usb-backup-$mydate.zip";
+
+list($used,$free) = explode(',',exec("df /boot|awk 'END{print $3,$4}'"));
+$usb = $free > $used;
+foreach (glob('/mnt/user/*',GLOB_ONLYDIR) as $share) {
+  $free = exec("df $share|awk 'END{print $4}'");
+  if ($free > $used) {$zip = $share; break;}
+}
+$zip = $zip ? "$zip/$backup" : ($usb ? "/boot/$backup" : "");
+if ($zip) {
+  chdir("/boot");
+  foreach (glob("*",GLOB_NOSORT+GLOB_ONLYDIR) as $folder) {
+    if (in_array($folder,$out)) continue;
+    exec("zip -qr ".escapeshellarg($zip)." ".escapeshellarg($folder));
+  }
+  foreach (glob("*",GLOB_NOSORT) as $file) {
+    if (is_dir($file)) continue;
+    exec("zip -q ".escapeshellarg($zip)." ".escapeshellarg($file));
+  }
+  symlink($zip,"$docroot/$backup");
+  echo $backup;
+}
+?>