[Bug]: System address book is not syncable

[ChristophWurst]

⚠️ 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 (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• Nextcloud Server is running on 64bit capable CPU, PHP and OS.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

The exposed system address book should be syncable like any other address book.

Steps to reproduce

1. Add a trusted server and a shared secret
2. Connect a Caldavclient using system:
3. Sync the system addressbook

Expected behavior

It syncs

Installation method

None

Nextcloud Server version

24

Operating system

None

PHP engine version

None

Web server

None

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

N/a

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response

[ChristophWurst]

Testing with DAVx5

Initial user address book sync

192.168.1.30 - admin [09/May/2023:10:47:38 +0200] "PROPFIND /remote.php/dav/addressbooks/users/admin/personal/ HTTP/2.0" 207 505 "-" "DAVx5/4.3.2-gplay (2023/05/02; dav4jvm; okhttp/4.10.0) Android/12" "-"
192.168.1.30 - admin [09/May/2023:10:47:40 +0200] "REPORT /remote.php/dav/addressbooks/users/admin/personal/ HTTP/2.0" 207 887 "-" "DAVx5/4.3.2-gplay (2023/05/02; dav4jvm; okhttp/4.10.0) Android/12" "-"
192.168.1.30 - admin [09/May/2023:10:47:41 +0200] "REPORT /remote.php/dav/addressbooks/users/admin/personal/ HTTP/2.0" 207 317326 "-" "DAVx5/4.3.2-gplay (2023/05/02; dav4jvm; okhttp/4.10.0) Android/12" "-"
192.168.1.30 - admin [09/May/2023:10:47:43 +0200] "PROPFIND /remote.php/dav/addressbooks/users/admin/personal/ HTTP/2.0" 207 505 "-" "DAVx5/4.3.2-gplay (2023/05/02; dav4jvm; okhttp/4.10.0) Android/12" "-"

Initial system address book sync

192.168.1.30 - system [09/May/2023:10:57:50 +0200] "PROPFIND /remote.php/dav/addressbooks/system/system/system/ HTTP/2.0" 207 488 "-" "DAVx5/4.3.2-gplay (2023/05/02; dav4jvm; okhttp/4.10.0) Android/12" "-"
192.168.1.30 - system [09/May/2023:10:57:55 +0200] "REPORT /remote.php/dav/addressbooks/system/system/system/ HTTP/2.0" 207 3166 "-" "DAVx5/4.3.2-gplay (2023/05/02; dav4jvm; okhttp/4.10.0) Android/12" "-"
192.168.1.30 - system [09/May/2023:10:57:56 +0200] "REPORT /remote.php/dav/addressbooks/system/system/system/ HTTP/2.0" 207 6570 "-" "DAVx5/4.3.2-gplay (2023/05/02; dav4jvm; okhttp/4.10.0) Android/12" "-"

[ChristophWurst]

Just saw system contacts on my phone. So it must work. I'll check again.

[ChristophWurst]

It works just fine. Also differential sync of a display name is propagated to my phone.