allow disabling log rotation

fixes #6896

close #6913

framework/CHANGELOG.md

@@ -9,6 +9,7 @@ Yii Framework 2 Change Log
 - Enh #6106: Added ability to specify `encode` for each item of `yii\widgets\Breadcrumbs` (samdark, aleksanderd)
 - Enh #6493: Added support for the `Access-Control-Expose-Headers` header by `yii\filters\Cors` (usualdesigner)
 - Enh #6697: Added `yii\helpers\Url::current()` method that allows adding or removing parameters from current URL (samdark, callmez)
+- Enh #6896: Added `yii\log\FileTarget::$enableRotation` to allow disabling log rotation when external tools are configured for this (cebe) 
 - Chg #5690: adjusted paths in message config generated by `yii message/config` to reflect directory structure better (mikehaertl, samdark)
 - Chg #6661: Hyperlinks that are enclosed within an exist form will use the same form for submission if they specify both of the `href` and `data-method` attributes (qiangxue)
 

framework/log/FileTarget.php

@@ -30,6 +30,13 @@ class FileTarget extends Target
      * The directory containing the log files will be automatically created if not existing.
      */
     public $logFile;
+    /**
+     * @var bool whether log files should be rotated when they reach a certain [[maxFileSize|maximum size]].
+     * Log rotation is enabled by default. This property allows you to disable it, when you have configured
+     * an external tools for log rotation on your server.
+     * @since 2.0.3
+     */
+    public $enableRotation = true;
     /**
      * @var integer maximum log file size, in kilo-bytes. Defaults to 10240, meaning 10MB.
      */
@@ -101,10 +108,12 @@ public function export()
             throw new InvalidConfigException("Unable to append to log file: {$this->logFile}");
         }
         @flock($fp, LOCK_EX);
-        // clear stat cache to ensure getting the real current file size and not a cached one
-        // this may result in rotating twice when cached file size is used on subsequent calls
-        clearstatcache();
-        if (@filesize($this->logFile) > $this->maxFileSize * 1024) {
+        if ($this->enableRotation) {
+            // clear stat cache to ensure getting the real current file size and not a cached one
+            // this may result in rotating twice when cached file size is used on subsequent calls
+            clearstatcache();
+        }
+        if ($this->enableRotation && @filesize($this->logFile) > $this->maxFileSize * 1024) {
             $this->rotateFiles();
             @flock($fp, LOCK_UN);
             @fclose($fp);