Let each storage implementation decide whether .part files should be uploaded to the storage

[jvillafanez]

Steps to reproduce

1. Upload a file to google drive through ownCloud
2. Reupload the same file to google drive through ownCloud

Expected behaviour

File should be overwritten

Actual behaviour

Duplicated file is created

Server configuration

Operating system:

Web server:

Database:

PHP version:

ownCloud version: ownCloud 10.4.1

Updated from an older ownCloud or fresh install: fresh install

Where did you install ownCloud from:

Signing status (ownCloud 9.0 and above):

Login as admin user into your ownCloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results into https://gist.github.com/ and puth the link here.

The content of config/config.php:

Log in to the web-UI with an administrator account and click on
'admin' -> 'Generate Config Report' -> 'Download ownCloud config report'
This report includes the config.php settings, the list of activated apps
and other details in a well sanitized form.

or 

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your ownCloud installation folder

*ATTENTION:* Do not post your config.php file in public as is. Please use one of the above
methods whenever possible. Both, the generated reports from the web-ui and from occ config:list
consistently remove sensitive data. You still may want to review the report before sending.
If done manually then it is critical for your own privacy to dilligently
remove *all* host names, passwords, usernames, salts and other credentials before posting.
You should assume that attackers find such information and will use them against your systems.

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your ownCloud installation folder.

Are you using external storage, if yes which one: local/smb/sftp/...

Are you using encryption: yes/no

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...

LDAP configuration (delete this part if not used)

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your ownCloud installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';


Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration

Browser:

Operating system:

Logs

Web server error log

Insert your webserver log here

ownCloud log (data/owncloud.log)

Insert your ownCloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log 
c) ...

Main problem seems to be in https://github.com/owncloud/core/blob/master/apps/dav/lib/Connector/Sabre/File.php#L638
That's a static list controlled by core in order to decide if the .part files are uploaded to the external storage. This is a problem as shown with google drive because the storage doesn't behave properly with the .part files. Other storages might have the same problem

The best solution, as written in the comment, is to let the storages decide. For the particular case of google, it should be the google storage the one that tells core not to upload the .part files.

[jvillafanez]

Related by / duplicate by #37062, #25826 ?

Yep. Closing this as duplicated.