Dopbox sync : Database gets overwritten by empty file

[HifeFish]

Describe the bug

Every now and then, KeepassDX overwrites the database with an empty file.

To Reproduce

Steps to reproduce the behavior: I am not sure what triggers the problem. Possibly related to being flushed from memory in the background while trying to generate or save login data entered in Firefox.

Expected behavior

Never overwrite the database with an empty file. Possibly one could write a new file before deleting the old one in case a crash occurs while writing the database.

KeePass Database

• Created with: KeepassXC 2.7.5, Ubuntu 22.04
• Version: 4
• Location: Remote file retrieved with Dropbox App
• File provider (content:// URI): content://com.dropbox.product.android.dbapp.document_provider.documts/document/LONG ALPHANUMERIC STRING
• Size: 1.6MB
• Contains attachment: No

KeePassDX:

• Version: 3.5.1
• Build: Free
• Language: English

Android:

• Device: GalaxyS8+
• Version: 9

Additional context

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[J-Jamet]

The problem comes from Dropbox, which doesn't manage file caches properly. https://github.com/Kunzisoft/KeePassDX/wiki/File-Manager-and-Sync#file-manager-application

Have you contacted the Dropbox team and what did they say about this?

[J-Jamet]

There's already a cache that prevents the file stream from being written if an exception is raised. Obviously, this can only work if the Dropbox application manages its errors and raises exceptions.

[J-Jamet]

Behavior has been improved with the cache, linked to #1680