Append config values to .user.ini

When running nextcloud with a web hoster it might be necessary
to extend .user.ini after each update (e.g. adding memory_limit).
To automate this step, an additional config entry may be provided
in config.php that specifies the lines to be added to .user.ini.

If the config option 'user_ini_additional_lines' exists, the provided
value (string or array of strings) will be added to .user.ini.

Signed-off-by: Mathias <koehrer08@koehrer-mail.de>

index.php

@@ -1023,6 +1023,19 @@ public function finalize() {
 			throw new \Exception('Could not rmdir .step');
 		}
 
+		/* Check if there is the need to extend .user.ini */
+		$user_ini_additional_lines = $this->getConfigOption('user_ini_additional_lines');
+		if ($user_ini_additional_lines) {
+			$this->silentLog('[info] Extend .user.ini');
+			if (is_array($user_ini_additional_lines)) {
+				$user_ini_additional_lines = implode(PHP_EOL, $user_ini_additional_lines);
+			}
+			$result = file_put_contents($this->baseDir . '/../.user.ini', PHP_EOL . '; Additional settings from config.php:' . PHP_EOL . $user_ini_additional_lines . PHP_EOL, FILE_APPEND | FILE_LOCK);
+			if ($result === false) {
+				throw new \Exception('Could append to .user.ini');
+			}
+		}
+
 		if (function_exists('opcache_reset')) {
 			$this->silentLog('[info] call opcache_reset()');
 			opcache_reset();