Feature: #101059 - Allow install tool sessions without shared file system

Description

It is now possible to store Install Tool sessions in Redis or to configure the session storage path for file-based Install Tool sessions.

As a shipped session handler, Redis can now be configured via options in TYPO3_CONF_VARS for host, port, database and authentication.

Example

To configure an alternative session handler for Install Tool sessions, set the needed options in your settings.php or additional.php file:

File-based session handler in config/system/settings.php

return [
    'BE' => [
        'installToolSessionHandler' => [
            'className' => \TYPO3\CMS\Install\Service\Session\FileSessionHandler::class,
            'options' => [
                'sessionPath' => \TYPO3\CMS\Core\Core\Environment::getVarPath() . '/session',
            ]
        ]
    ]
];

Redis session handler in config/system/settings.php

return [
    'BE' => [
        'installToolSessionHandler' => [
            'className' => \TYPO3\CMS\Install\Service\Session\RedisSessionHandler::class,
            'options' => [
                'host' => '127.0.0.1',
                'port' => 6379,
                'database' => 0,
                'authentication' => [
                    'user' => 'redis',
                    'pass' => 'redis'
                ]
            ]
        ]
    ]
];

Impact

The default file-based session handling for the Install Tool remains unchanged. If an alternative session handler for the Install Tool is not configured, the default behavior will be used.

Custom session handlers can be implemented by implementing PHP's own \SessionHandlerInterface.