Board in trash breaks file listing (PROPFIND 500) for users with a card attachment shared/mounted

[NavidSassan]

Describe the bug

When a board is deleted, Deck only soft-deletes it (deck_boards.deleted_at is set) and the row stays until DeleteCron hard-deletes it after trashRetentionHours. During that window, every user who has a file attachment of a card on that board mounted in their file tree gets an uncaught DoesNotExistException on every file listing.

The exception escapes into the files mount setup, so it does not just break Deck. It breaks PROPFIND on the user's files root, which means the desktop client can no longer sync and the Files app fails to list.

The error stops on its own once DeleteCron removes the board row, which makes it look transient, but it lasts for the whole trash retention period.

To Reproduce

1. As user A, attach a file from Files to a card ("share file with card", creates an oc_share row with share_type = 12 and share_with = <card id>).
2. Share the board with user B, so the attachment is mounted for B.
3. As user A, delete the board. Do not empty the trash.
4. As user A or B, run a PROPFIND on the files root (open Files, or let the desktop client sync).

Result: HTTP 500, and the log entry below on every request.

Expected behavior

Shares belonging to a board in the trash should not be resolved into mounts, and a trashed board must never cause an uncaught exception in the files mount setup.

Root cause

(line numbers from master, 4.0.0-dev.2)

1. BoardMapper::findBoardIds() (lib/Db/BoardMapper.php:81) has no deleted_at = 0 filter, so boards in the trash stay in the list.
2. DeckShareProvider::_getSharedWith() (lib/Sharing/DeckShareProvider.php:826) filters only dc.deleted_at = 0, which is the card. A card on a trashed board still has deleted_at = 0, so its share is returned.
3. DeckShareProvider::applyBoardPermission() (lib/Sharing/DeckShareProvider.php:678) calls checkPermission(..., $allowDeletedCard = true) while $allowDeletedBoard stays false.
4. PermissionService::checkPermission() (lib/Service/PermissionService.php:157) passes that false to getPermissions() -> getBoard() -> BoardMapper::find(..., $allowDeleted = false), which builds the deleted_at = 0 query and throws DoesNotExistException.
5. applyBoardPermission() only catches NoPermissionException, so the exception propagates through OC\Share20\Manager::getSharedWith() and OCA\Files_Sharing\MountProvider into OC\Files\SetupManager, aborting the request.

Possible fix

Any of these, the first two look safer because a trashed board's shares should not be mounted at all:

• add deleted_at = 0 to BoardMapper::findBoardIds()
• add db.deleted_at = 0 to the _getSharedWith() query
• pass $allowDeletedBoard = true in applyBoardPermission() and additionally catch DoesNotExistException there

Server details

Operating system: Rocky Linux 9

Web server: Apache/2.4.62

Database: MariaDB-server 11.4.12

PHP version: PHP 8.5.9

Nextcloud version: 34.0.2.1

Where did you install Nextcloud from: wget https://download.nextcloud.com/server/releases/{{ nextcloud__version }}.tar.bz2

Signing status:

No errors have been found.

List of activated apps:

Enabled:
  - admin_audit: 1.24.0
  - appstore: 1.0.0
  - bruteforcesettings: 7.0.0
  - calendar: 6.5.2
  - calendar_resource_management: 0.12.1
  - cloud_federation_api: 1.18.0
  - comments: 1.24.0
  - contacts: 8.7.5
  - contactsinteraction: 1.15.0
  - dashboard: 7.14.0
  - dav: 1.39.0
  - deck: 1.18.3
  - drawio: 4.3.5
  - federatedfilesharing: 1.24.0
  - files: 2.6.0
  - files_downloadlimit: 5.2.0
  - files_external: 1.26.0
  - files_lock: 34.0.1
  - files_pdfviewer: 7.0.0-dev.0
  - files_sharing: 1.26.0
  - files_trashbin: 1.24.0
  - files_versions: 1.27.0
  - forms: 5.3.5
  - impersonate: 5.0.0
  - logreader: 7.0.0
  - lookup_server_connector: 1.22.0
  - mail: 5.10.11
  - notes: 6.0.1
  - notifications: 7.0.0-dev.1
  - notify_push: 1.3.5
  - oauth2: 1.22.0
  - office: 1.0.0
  - password_policy: 6.0.0-dev.0
  - polls: 9.1.4
  - privacy: 6.0.0-dev.1
  - profile: 1.3.0
  - provisioning_api: 1.24.0
  - related_resources: 5.0.0-dev.0
  - richdocuments: 11.1.0
  - serverinfo: 6.0.0
  - settings: 1.17.0
  - sharebymail: 1.24.0
  - spreed: 24.0.3
  - systemtags: 1.24.0
  - tasks: 0.18.1
  - text: 8.0.0
  - theming: 2.9.0
  - twofactor_admin: 4.12.0
  - twofactor_backupcodes: 1.23.0
  - twofactor_email: 3.4.1
  - twofactor_totp: 16.0.0
  - updatenotification: 1.24.0
  - viewer: 7.0.0-dev.0
  - webhook_listeners: 1.6.0
  - whiteboard: 1.5.9
  - workflowengine: 2.16.0
Disabled:
  - activity: 7.0.0 (installed 7.0.0)
  - announcementcenter: 7.5.0 (installed 7.5.0)
  - app_api: 34.0.0 (installed 32.0.0)
  - circles: 34.0.0 (installed 31.0.0)
  - encryption: 2.22.0
  - federation: 1.24.0 (installed 1.21.0)
  - files_reminders: 1.7.0 (installed 1.4.0)
  - firstrunwizard: 7.0.0-dev.0 (installed 4.0.0)
  - nextcloud_announcements: 6.0.0 (installed 3.0.0)
  - photos: 7.0.0 (installed 4.0.0)
  - recommendations: 7.0.0 (installed 4.0.0)
  - support: 6.0.0 (installed 3.0.0)
  - survey_client: 6.0.0-dev.0 (installed 3.0.0)
  - suspicious_login: 12.0.0-dev.0 (installed 11.0.0-dev.0)
  - testing: 1.23.0
  - twofactor_nextcloud_notification: 8.0.0
  - user_ldap: 1.25.0
  - user_status: 1.14.0 (installed 1.12.0)
  - weather_status: 1.14.0 (installed 1.11.0)

Are you using an external user-backend, if yes which one: no

Logs

Nextcloud log (data/nextcloud.log)

Repeating on every PROPFIND (user, request IDs and remote address redacted):

{"reqId":"REDACTED","level":3,"time":"2026-08-10T22:06:35+02:00","remoteAddr":"REDACTED","user":"REDACTED","app":"webdav","method":"PROPFIND","url":"/remote.php/dav/files/REDACTED/","scriptName":"/remote.php","message":"Did expect one result but found none when executing: query \"SELECT * FROM `*PREFIX*deck_boards` WHERE (`id` = :dcValue2) AND (`deleted_at` = :dcValue1) ORDER BY `id` ASC\"; ","userAgent":"Mozilla/5.0 (Macintosh) mirall/34.0.1 (Nextcloud, macos-25.5.0)","version":"34.0.2.1","exception":{"Exception":"OCP\\AppFramework\\Db\\DoesNotExistException","Message":"Did expect one result but found none when executing: query \"SELECT * FROM `*PREFIX*deck_boards` WHERE (`id` = :dcValue2) AND (`deleted_at` = :dcValue1) ORDER BY `id` ASC\"; "}}