During initial backup, paths are always null

从 custom_apps/backup/lib/Service/PointService.php 开始，重点查看 initBackupFS() 和 scanFoldersFromAppData()，然后跟踪 BeforeNodeWrittenEvent，直到 apps/files_versions/lib/Listener/FileEventsListener.php 和 getPathForNode。使用提供的堆栈跟踪复现初始备份失败。完成的标准是备份路径不再以 null 传递，并且初始备份可以继续进行。

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.