Core installation events
The \Zikula\Bundle\CoreInstallerBundle\Event
namespace provides these event classes:
/**
* Occurs during core installation before the modules are installed.
* Stop propagation of the event to cause the core installer to fail.
*/
class CoreInstallationPreExtensionInstallation
/**
* Occurs during core upgrade before the modules are upgraded.
* Stop propagation of the event to cause the core upgrader to fail.
*/
class CoreUpgradePreExtensionUpgrade