Nextcloud trying to sync when no internet is available.

[cegfault]

⚠️ Before posting ⚠️

• This is a bug, not a question or an enhancement.
• I've searched for similar issues and didn't find a duplicate.
• I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
• I agree to follow Nextcloud's Code of Conduct.

Steps to reproduce

1. Have a Nextcloud with many (10s of thousands / 100s of thousands) of files
2. Upgrade app to 3.30.6
3. Nextcloud tries to auto-sync all files (see [NOTICE] Version 3.30.1 Causing Sync Issues / Synchronising All Files #13872)
4. Disable both wifi and mobile data
5. Force stop and reopen app (or reboot phone)
6. See that Nextcloud is still trying to sync and giving 10s/100s of thousands of notification errors
7. If the number of files on Nextcloud is large enough, the entire phone CPU will be consumed. On my phone I was unable to open the settings page; I could only uninstall and reinstall the app. This obviously will vary by phone/tablet manufacturer and the number of files/notifications Nextcloud creates.

Expected behaviour

Nextcloud should not being trying to sync when no internet is available. It may also be wise to have a "stop gap" where if X errors occur in Y seconds then the app pauses for Z seconds before restarting/continuing.

Actual behaviour

Nextcloud still trying to two-way sync without data, giving thousands of notification errors.

Android version

Android 14 (LineageOS 21)

Device brand and model

Pixel 8

Stock or custom OS?

Custom (explain in "additional information")

Nextcloud android app version

3.30.6

Nextcloud server version

30.0.4.1

Using a reverse proxy?

No

Android logs

No response

Server error logs

Not submitted for length, repitition, and privacy, but apache contains thousands of lines like this:

<<IP>> - <<user>> [02/Jan/2025:06:26:21 +0000] "PROPFIND /cloud/remote.php/dav/files/<<USER>>/<<FILENAME>> HTTP/1.1" 207 14321 "-" "Mozilla/5.0 (Android) Nextcloud-android/3.30.6


Nextcloud.log shows no errors.

Additional information

No response

[cegfault]

Also please fix issues related to #13872 -- if the app didn't randomly (on update) start trying to sync all my files then this issue would never have happened :)

That being said, this bug should still exist to (a) prevent sync without data, and (b) limit sync events with continuous, repetitive errors.

Thanks for all you guys do, Nextcloud has become essential to be precisely because it's great :)

[tobiasKaminsky]

This might be because it already scheduled those tasks.
Is this still happening after some time after the upgrade?

[cegfault]

@tobiasKaminsky yes, it is still happening now.

It also shouldn't matter whether the tasks were scheduled or not; there should still be checking for internet and error rates. If the tasks were scheduled that would be a bug in and of itself (NC shouldn't have an app update that automatically enables and schedules a sync for all files), but this bug report isn't about that.