[OCP\Files\NotPermittedException] Could not create folder "/appdata_ocfmw89yr7pg/preview/a/b/a/d/2/c/9/34634" Version 5.4.0

[coesy]

I've been trying to run occ preview:generate-all -vvv. It gets quite a lot of the way through the folders and just errors out with the error in the title. I've checked and the folder already exists, it seems to be trying to create the folder, see's that it exists and errors out. I keep getting stuck at this point. It seems that there are a few forum posts on this, is there a fix for this now? This is 5.4.0

Thanks

[coesy]

Full stack trace here

In Folder.php line 162:
2024-03-03T16:00:19+00:00                                                                                
2024-03-03T16:00:19+00:00   [OCP\Files\NotPermittedException]                                            
2024-03-03T16:00:19+00:00   Could not create folder "/appdata_ocfmw89yr7pg/preview/2/0/7/e/e/4/b/65940"  
2024-03-03T16:00:19+00:00                                                                                
2024-03-03T16:00:19+00:00 
2024-03-03T16:00:19+00:00 Exception trace:
2024-03-03T16:00:19+00:00   at /app/www/public/lib/private/Files/Node/Folder.php:162
2024-03-03T16:00:19+00:00  OC\Files\Node\Folder->newFolder() at /app/www/public/lib/private/Files/AppData/AppData.php:147
2024-03-03T16:00:19+00:00  OC\Files\AppData\AppData->newFolder() at /app/www/public/lib/private/Preview/Storage/Root.php:74
2024-03-03T16:00:19+00:00  OC\Preview\Storage\Root->newFolder() at /app/www/public/lib/private/Preview/Generator.php:607
2024-03-03T16:00:19+00:00  OC\Preview\Generator->getPreviewFolder() at /app/www/public/lib/private/Preview/Generator.php:133
2024-03-03T16:00:19+00:00  OC\Preview\Generator->generatePreviews() at /app/www/public/lib/private/PreviewManager.php:207
2024-03-03T16:00:19+00:00  OC\PreviewManager->generatePreviews() at /config/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:230
2024-03-03T16:00:19+00:00  OCA\PreviewGenerator\Command\Generate->parseFile() at /config/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:212
2024-03-03T16:00:19+00:00  OCA\PreviewGenerator\Command\Generate->parseFolder() at /config/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:210
2024-03-03T16:00:19+00:00  OCA\PreviewGenerator\Command\Generate->parseFolder() at /config/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:210
2024-03-03T16:00:19+00:00  OCA\PreviewGenerator\Command\Generate->parseFolder() at /config/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:190
2024-03-03T16:00:19+00:00  OCA\PreviewGenerator\Command\Generate->generateUserPreviews() at /config/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:136
2024-03-03T16:00:19+00:00  OCA\PreviewGenerator\Command\Generate->OCA\PreviewGenerator\Command\{closure}() at /app/www/public/lib/private/User/Manager.php:656
2024-03-03T16:00:19+00:00  OC\User\Manager->callForSeenUsers() at /config/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:135
2024-03-03T16:00:19+00:00  OCA\PreviewGenerator\Command\Generate->execute() at /app/www/public/3rdparty/symfony/console/Command/Command.php:298
2024-03-03T16:00:19+00:00  Symfony\Component\Console\Command\Command->run() at /app/www/public/3rdparty/symfony/console/Application.php:1040
2024-03-03T16:00:19+00:00  Symfony\Component\Console\Application->doRunCommand() at /app/www/public/3rdparty/symfony/console/Application.php:301
2024-03-03T16:00:19+00:00  Symfony\Component\Console\Application->doRun() at /app/www/public/3rdparty/symfony/console/Application.php:171
2024-03-03T16:00:19+00:00  Symfony\Component\Console\Application->run() at /app/www/public/lib/private/Console/Application.php:206
2024-03-03T16:00:19+00:00  OC\Console\Application->run() at /app/www/public/console.php:100
2024-03-03T16:00:19+00:00  require_once() at /app/www/public/occ:11
2024-03-03T16:00:19+00:00 
2024-03-03T16:00:19+00:00 preview:generate-all [-p|--path [PATH]] [--] [<user_id>...]
2024-03-03T16:00:19+00:00 

[A1asd]

Try running this command as the user this folder belongs too. Usually this should be www-data
sudo -u www-data occ preview:generate-all -vvv

[joshtrichards]

Related (maybe): #421

[JavierAntonYuste]

Same happens to me, has anyone found a solution?

[joshtrichards]

@JavierAntonYuste In what version of Nextcloud?

[JavierAntonYuste]

@joshtrichards My version is the latest one: Nextcloud 30.0.4

Debugging a little bit more, my error is:

[OCP\Files\NotPermittedException]                                             
2025-01-12T14:42:37+00:00   Could not create folder "/appdata_ocg5aylpsjxs/preview/b/d/4/a/9/4/c/103510"

From that log I can infer that the preview is attempted to be created in the root folder. Checking my data folder /var/www/html/data, the folder appdata_ocg5aylpsjxs is there... maybe the issue is related with this? Maybe a wrong location in preview creation?