[ocis] Size Tree accounting - calculated folder sizes

[exalate-issue-sync]

Story

As a user i want to know how big the folder is without browsing into it to quickly get an overview

Status quo

As of now folders are displayed with a size of 4KB in the web ui. This doesn't give a clue about actual folder sizes.

Performance

Make it work first
Performance later

[exalate-issue-sync]

Michael Barz commented: [~jfd] In which storage driver scope was this ticket created?

[michaelstingl]

I've seen this with owncloud.ocis.works

Web	Desktop 2.7.4
Android 2.15.3	iOS 11.4.4

@abelgardep @jesmrec Android shows 0KB, while web and iOS show 4KB. What WebDAV property do we query here?

Hint from @butonic :

might be a difference in the webdav properties that are used. there is DAV:getcontentsize and oc10 introduced oc:size.
the latter is used to transport the 'tree size' and exists on folders as well as on files. DAV:getcontentsize is not defined for folders or in webdav speak: collections.

[abelgardep]

We use oc:size in Android. The problem is a hardcoded DIR since ocis sends httpd/unix-directory. I will update it 👍

Should be fixed in owncloud/android#3040

[michaelstingl]

In oC10, we also have folders with unknown size. Shouldn’t oCIS announce unknown size instead of the fake-4KB size?

[exalate-issue-sync]

Jörn Friedrich Dreyer commented: implemented is part of querying the free space

[exalate-issue-sync]

Jörn Friedrich Dreyer commented: PR in cs3org/reva#1405

[exalate-issue-sync]

Jörn Friedrich Dreyer commented: cs3org/reva#1405 merged and updated in ocis with #1684