Merge pull request #53758 from nextcloud/backport/53738/stable31

[stable31] fix(syslog): open syslog channel on write

lib/private/Log/Syslog.php

@@ -20,15 +20,18 @@ class Syslog extends LogDetails implements IWriter {
 		ILogger::FATAL => LOG_CRIT,
 	];
 
+	private string $tag;
+
 	public function __construct(
 		SystemConfig $config,
 		?string $tag = null,
 	) {
 		parent::__construct($config);
 		if ($tag === null) {
-			$tag = $config->getValue('syslog_tag', 'Nextcloud');
+			$this->tag = $config->getValue('syslog_tag', 'Nextcloud');
+		} else {
+			$this->tag = $tag;
 		}
-		openlog($tag, LOG_PID | LOG_CONS, LOG_USER);
 	}
 
 	public function __destruct() {
@@ -41,6 +44,7 @@ class Syslog extends LogDetails implements IWriter {
 	 */
 	public function write(string $app, $message, int $level): void {
 		$syslog_level = $this->levels[$level];
+		openlog($this->tag, LOG_PID | LOG_CONS, LOG_USER);
 		syslog($syslog_level, $this->logDetailsAsJSON($app, $message, $level));
 	}
 }