Ad Schellevis aba58e5ee4 Logging: Add a symlink for e.g. system.log to system_todaysdate.log for log parsing (https://github.com/opnsense/core/issues/4993)
same same as dd6a04a68a, but different.
Concerns fixed in this commit:

o archive shouldn't generate files so old "archived" files remain untouched
o "latest.log" should point to the latest version know, which could be todays or a file from the past
o better to not remove links when unchanged to prevent excessive writes
2021-11-18 17:06:40 +01:00

71 lines
2.8 KiB
PHP
Executable File

#!/usr/local/bin/php
<?php
/*
* Copyright (C) 2020-2021 Deciso B.V.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
require_once("config.inc");
require_once("system.inc");
require_once("util.inc");
require_once("interfaces.inc");
require_once("plugins.inc");
$preserve_logs = !empty($config['syslog']['preservelogs']) ? $config['syslog']['preservelogs'] : 31;
// gather all syslog created local logs (filename starts with directory name_[8 digits].log)
$relevant_logs = [];
$it = new RecursiveDirectoryIterator("/var/log");
foreach(new RecursiveIteratorIterator($it) as $file) {
if ($file->isFile()) {
$log_subject = basename($file->getPath());
if (strpos($file->getFilename(), $log_subject . "_") === 0
&& $file->getExtension() == "log"
&& ctype_digit(substr($file->getFilename(), strlen($log_subject)+1, 8))) {
if (!isset($relevant_logs[$log_subject])) {
$relevant_logs[$log_subject] = [];
}
$relevant_logs[$log_subject][] = (string)$file;
}
}
}
// remove expired logs and set latest.log symlink
foreach ($relevant_logs as $log_subject => $items) {
rsort($items);
if (count($items) > $preserve_logs) {
foreach (array_slice($items, $preserve_logs) as $filename) {
@unlink($filename);
}
}
// latest is always top of rsorted list $items[0]
$current_target = @readlink($link);
if ($current_target != $items[0]) {
$link = "/var/log/{$log_subject}/latest.log";
@unlink($link);
@symlink($items[0], $link);
}
}