#!/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') : [];
$dir = ['system','appdata','isos','domains'];
$out = ['prev','previous','syslinux'];

$server = isset($var['NAME']) ? str_replace(' ','_',strtolower($var['NAME'])) : 'tower';
$mydate = date('Ymd-Hi');
$backup = "$server-flash-backup-$mydate.zip";

$used = exec("df /boot|awk 'END{print $3}'") * 1.5;
$free = exec("df /|awk 'END{print $4}'");
if ($free > $used) $zip = "/$backup"; else {
  foreach ($dir as $share) {
    if (!is_dir("/mnt/user/$share")) continue;
    $free = exec("df /mnt/user/$share|awk 'END{print $4}'");
    if ($free > $used) {$zip = "/mnt/user/$share/$backup"; break;}
  }
}
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;
}
?>