During initial backup, paths are always null

Inizia da custom_apps/backup/lib/Service/PointService.php, in particolare da initBackupFS() e scanFoldersFromAppData(), quindi segui il BeforeNodeWrittenEvent fino a apps/files_versions/lib/Listener/FileEventsListener.php e getPathForNode. Usa lo stack trace fornito per riprodurre il fallimento del backup iniziale. Il lavoro è completato quando il percorso del backup non viene più passato come null e il backup iniziale può procedere.

I've just installed the app recently, and have been unable to take a backup so far.

I run the standard Nextcloud image inside a Docker container. I have both stages of the backup pointed to an NFS mount in the container. Double checked that the permissions are correct, but it's not even able to get to the point of actually storing anything.

It can't even read files because it keeps pulling up the path of whatever file it's trying to look at as null. This causes an error with one of the functions that is expecting a path string. I don't really know PHP so this has been difficult for me to try to debug, but I'm pretty sure it is deriving the user session as null in /var/www/html/apps/files_versions/lib/Listener/FileEventsListener.php. I added some logging to getPathForNode, and the $user and $owner variables both come up null. As a result, the function returns null, and that value is plugged into OC\Files\View->file_exists(), which is not expecting a null value. Full log:

An unhandled exception has been thrown:
TypeError: OC\Files\View::basicOperation(): Argument #2 ($path) must be of type string, null given, called in /var/www/html/lib/private/Files/View.php on line 528 and defined in /var/www/html/lib/private/Files/View.php:1128
Stack trace:
#0 /var/www/html/lib/private/Files/View.php(528): OC\Files\View->basicOperation('file_exists', NULL)
#1 /var/www/html/lib/private/Files/Filesystem.php(545): OC\Files\View->file_exists(NULL)
#2 /var/www/html/apps/files_versions/lib/Storage.php(189): OC\Files\Filesystem::file_exists(NULL)
#3 /var/www/html/apps/files_versions/lib/Listener/FileEventsListener.php(196): OCA\Files_Versions\Storage::store(NULL)
#4 /var/www/html/apps/files_versions/lib/Listener/FileEventsListener.php(102): OCA\Files_Versions\Listener\FileEventsListener->write_hook(Object(OC\Files\Node\File))
#5 /var/www/html/lib/private/EventDispatcher/ServiceEventListener.php(86): OCA\Files_Versions\Listener\FileEventsListener->handle(Object(OCP\Files\Events\Node\BeforeNodeWrittenEvent))
#6 /var/www/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php(230): OC\EventDispatcher\ServiceEventListener->__invoke(Object(OCP\Files\Events\Node\BeforeNodeWrittenEvent), 'OCP\\Files\\Event...', Object(Symfony\Component\EventDispatcher\EventDispatcher))
#7 /var/www/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php(59): Symfony\Component\EventDispatcher\EventDispatcher->callListeners(Array, 'OCP\\Files\\Event...', Object(OCP\Files\Events\Node\BeforeNodeWrittenEvent))
#8 /var/www/html/lib/private/EventDispatcher/EventDispatcher.php(94): Symfony\Component\EventDispatcher\EventDispatcher->dispatch(Object(OCP\Files\Events\Node\BeforeNodeWrittenEvent), 'OCP\\Files\\Event...')
#9 /var/www/html/lib/private/EventDispatcher/EventDispatcher.php(106): OC\EventDispatcher\EventDispatcher->dispatch('OCP\\Files\\Event...', Object(OCP\Files\Events\Node\BeforeNodeWrittenEvent))
#10 /var/www/html/lib/private/Files/Node/HookConnector.php(100): OC\EventDispatcher\EventDispatcher->dispatchTyped(Object(OCP\Files\Events\Node\BeforeNodeWrittenEvent))
#11 /var/www/html/lib/private/legacy/OC_Hook.php(105): OC\Files\Node\HookConnector->write(Array)
#12 /var/www/html/lib/private/Files/View.php(1270): OC_Hook::emit('OC_Filesystem', 'write', Array)
#13 /var/www/html/lib/private/Files/View.php(1144): OC\Files\View->runHooks(Array, '/backup/staging...')
#14 /var/www/html/lib/private/Files/View.php(680): OC\Files\View->basicOperation('file_put_conten...', '/adam/files/bac...', Array, '')
#15 /var/www/html/lib/private/Files/Node/Folder.php(188): OC\Files\View->file_put_contents('/adam/files/bac...', '')
#16 /var/www/html/lib/private/Files/SimpleFS/SimpleFolder.php(89): OC\Files\Node\Folder->newFile('.nobackup', '')
#17 /var/www/html/custom_apps/backup/lib/Service/PointService.php(796): OC\Files\SimpleFS\SimpleFolder->newFile('.nobackup', '')
#18 /var/www/html/custom_apps/backup/lib/Service/PointService.php(642): OCA\Backup\Service\PointService->initBackupFS()
#19 /var/www/html/custom_apps/backup/lib/Command/PointScan.php(129): OCA\Backup\Service\PointService->scanFoldersFromAppData()
#20 /var/www/html/3rdparty/symfony/console/Command/Command.php(298): OCA\Backup\Command\PointScan->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#21 /var/www/html/core/Command/Base.php(177): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#22 /var/www/html/3rdparty/symfony/console/Application.php(1040): OC\Core\Command\Base->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#23 /var/www/html/3rdparty/symfony/console/Application.php(301): Symfony\Component\Console\Application->doRunCommand(Object(OCA\Backup\Command\PointScan), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#24 /var/www/html/3rdparty/symfony/console/Application.php(171): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#25 /var/www/html/lib/private/Console/Application.php(206): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#26 /var/www/html/console.php(100): OC\Console\Application->run()
#27 /var/www/html/occ(11): require_once('/var/www/html/c...')
#28 {main}%                                                      

I'm kind of not sure where to go from there. I'm not sure where this user session is coming from, and I don't have experience debugging PHP. Some help would be immensely appreciated.