$updater->listen('\OC\Updater', 'dbSimulateUpgradeBefore', function () use($eventSource, $l) {
$eventSource->send('success', (string)$l->t('Checking whether the database schema can be updated (this can take a long time depending on the database size)'));
});
$updater->listen('\OC\Updater', 'dbSimulateUpgrade', function () use ($eventSource, $l) {
$updater->listen('\OC\Updater', 'appUpgradeCheckBefore', function () use ($eventSource, $l) {
$eventSource->send('success', (string)$l->t('Checking updates of apps'));
});
$updater->listen('\OC\Updater', 'appSimulateUpdate', function ($app) use ($eventSource, $l) {
$eventSource->send('success', (string)$l->t('Checking whether the database schema for %s can be updated (this can take a long time depending on the database size)', [$app]));
});
$updater->listen('\OC\Updater', 'appUpgradeCheck', function () use ($eventSource, $l) {
$eventSource->send('success', (string)$l->t('Checked database schema update for apps'));
$updater->listen('\OC\Updater', 'appUpgradeCheckBefore', function () use ($output) {
$output->writeln('<info>Checking updates of apps</info>');
});
$updater->listen('\OC\Updater', 'appSimulateUpdate', function ($app) use ($output) {
$output->writeln("<info>Checking whether the database schema for <$app> can be updated (this can take a long time depending on the database size)</info>");
});
$updater->listen('\OC\Updater', 'appUpgradeCheck', function () use ($output) {
$output->writeln('<info>Checked database schema update for apps</info>');