[Bug]: Nextcloud deletes .~lock files from Libroffice

[derspotter]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Nextcloud simply deletes with no warning any .~lock.*.odt files that Libroffice creates in order to prevent data loss when your computer turns off without saving the file. This has caused me great pain. I specifically installed nextcloud in order to not experience file loss and now it is nextcloud causing it!

Steps to reproduce

1. Write inside a libroffice .odt file
2. turn off your computer without saving the file (battery empty, fast shutdown)
3. when nextcloud syncs, it deletes the .~lock recovery file, so no recovery possible

Expected behavior

Nextcloud should at least not delete the file even if it does not sync it, better even it syncs the file.

Installation method

Official All-in-One appliance

Nextcloud Server version

master

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response

[solracsf]

Those files are in the exclude list.

desktop/sync-exclude.lst

Line 5 in c52b1e9

.~lock.*

You can override that list in your client configuration.
Check https://help.nextcloud.com if you need further assistance 👍

[derspotter]

I know, but they should not be. Why would one want to automatically delete a backup? This makes no sense at all. They should be removed by standard.

[joshtrichards]

I believe this is what the Allow deletion toggle option (in the Ignored Files* list) is intended for, but it is already off for .~lock files. :thinking

What client version, @derspotter?