Update app mail from appstore throws exception on Upgrade to Nextcloud 20

[NiklasRosenstein]

Expected behavior

The upgrade should succeed.

Actual behavior

Upgrading from Nextcloud 19 to 20 results in

web_1  | Checking for update of app mail in appstore
web_1  | Update app mail from appstore
web_1  | An unhandled exception has been thrown:
web_1  | Error: Class 'OCA\Mail\AppInfo\BootstrapSingleton' not found in /var/www/html/custom_apps/mail/lib/AppInfo/Application.php:35
web_1  | Stack trace:
web_1  | #0 /var/www/html/lib/private/ServerContainer.php(108): OCA\Mail\AppInfo\Application->__construct()
web_1  | #1 /var/www/html/lib/private/ServerContainer.php(171): OC\ServerContainer->getAppContainer('mail', 'Mail')
web_1  | #2 /var/www/html/lib/private/ServerContainer.php(138): OC\ServerContainer->getAppContainerForService('OCA\\Mail\\Migrat...')
web_1  | #3 /var/www/html/lib/private/DB/MigrationService.php(444): OC\ServerContainer->query('OCA\\Mail\\Migrat...')
web_1  | #4 /var/www/html/lib/private/DB/MigrationService.php(468): OC\DB\MigrationService->createInstance('1050Date2020062...')
web_1  | #5 /var/www/html/lib/private/DB/MigrationService.php(414): OC\DB\MigrationService->executeStep('1050Date2020062...', false)
web_1  | #6 /var/www/html/lib/private/legacy/OC_App.php(976): OC\DB\MigrationService->migrate()
web_1  | #7 /var/www/html/lib/private/Installer.php(206): OC_App::updateApp('mail')
web_1  | #8 /var/www/html/lib/private/Updater.php(452): OC\Installer->updateAppstoreApp('mail')
web_1  | #9 /var/www/html/lib/private/Updater.php(260): OC\Updater->upgradeAppStoreApps(Array)
web_1  | #10 /var/www/html/lib/private/Updater.php(130): OC\Updater->doUpgrade('20.0.0.9', '19.0.4.2')
web_1  | #11 /var/www/html/core/Command/Upgrade.php(255): OC\Updater->upgrade()
web_1  | #12 /var/www/html/3rdparty/symfony/console/Command/Command.php(255): OC\Core\Command\Upgrade->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
web_1  | #13 /var/www/html/3rdparty/symfony/console/Application.php(1000): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
web_1  | #14 /var/www/html/3rdparty/symfony/console/Application.php(271): Symfony\Component\Console\Application->doRunCommand(Object(OC\Core\Command\Upgrade), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
web_1  | #15 /var/www/html/3rdparty/symfony/console/Application.php(147): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
web_1  | #16 /var/www/html/lib/private/Console/Application.php(215): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
web_1  | #17 /var/www/html/console.php(100): OC\Console\Application->run()
web_1  | #18 /var/www/html/occ(11): require_once('/var/www/html/c...')
web_1  | #19 {main}    0/0 [>---------------------------]   0%[21-Oct-2020 15:16:27] NOTICE: fpm is running, pid 1

And Nextcloud stays in maintenance mode.

Mail app

Mail app version: (see apps admin page, e.g. 0.5.3)

Mailserver or service: (e.g. Outlook, Yahoo, Gmail, Exchange,...)

Server configuration

Operating system: Debian 9

Web server: Nginx

Database: PostgreSQL

PHP version: (e.g. 7.0)

Nextcloud Version: 20.x

I use the nextcloud:20-fpm image after previously being on nextcloud:19-fpm

[NiklasRosenstein]

Turning off maintenance mode manually via occ gives

Trying "Start Update" now

---

Now that results in an error with "news", so maybe it's not an issue with mail directly.

Now I've run ./occ upgrade directly and that worked

[ChristophWurst]

Dup of #3727