Error while syncing chunked files: server replied: Precondition failed (An If-Match header was specified and the resource did not exist)

[umgfoin]

I'm adding a reference to this nextcloud issue as it might be client-related.

Expected behaviour

All files are synced.

Actual behaviour

File upload starts and stops after some progress with error:
Certain files are not synced if upload is chunked.

Steps to reproduce

1. Create a jpg with size 10.1 MB in a synced folder
2. Watch sync progress and log

Server configuration

Operating system:
CentOS 6.9

Web server:
nginx version: nginx/1.11.10

Database:
Postgres 9.6.3

PHP version:
PHP 7.1.6 (fpm-fcgi)

ownCloud version:
Nextcloud 12.0.0

Storage backend (external storage):

Client configuration

Client version:
Version 2.3.2beta (build 1).

Operating system:
Win7 x64

OS language:
DE

Qt version used by client package (Linux only, see also Settings dialog):

Client package (From ownCloud or distro) (Linux only):

Installation path of client:

Logs

Please use Gist (https://gist.github.com/) or a similar code paster for longer
logs.

Template for output < 10 lines

1. Client logfile:

22.06.2017 15:03:29, InstantUpload/2017/06/2017-06-17 17-38-12 3036_stitch.jpg, Nextcloud,Error transferring https://<fqdn>/remote.php/dav/files/hias/InstantUpload/2017/06/2017-06-17 17-38-12 3036_stich.jpg-chunking-3292803479-2-0 - server replied: Precondition failed (An If-Match header was specified and the resource did not exist).

2. Web server error log:

3. Server logfile: ownCloud log (data/owncloud.log):

Sabre\DAV\Exception\PreconditionFailed: HTTP/1.1 412 An If-Match header was specified and the resource did not exist
/var/www/<nondisclosed>/3rdparty/sabre/dav/lib/DAV/Server.php - line 474: Sabre\DAV\Server->checkPreconditions(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/<nondisclosed>/3rdparty/sabre/dav/lib/DAV/Server.php - line 254: Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/<nondisclosed>/apps/dav/lib/Server.php - line 253: Sabre\DAV\Server->exec()
/var/www/<nondisclosed>/apps/dav/appinfo/v2/remote.php - line 33: OCA\DAV\Server->exec()
/var/www/<nondisclosed>/remote.php - line 162: require_once('/var/www/<nondisclosed>...')
{main}

[guruz]

Sorry, this is for sure (99.9% chance) a nC server issue and has nothing to do with oC/nC client.
Especially if it happens after a server upgrade as the linked issue said

Cant sync - Precondition failed after upgrade from 11.0.2 to 12.0

[PVince81]

It could be what I observed here: owncloud/core#28197

@umgfoin are the files that don't sync received shared files ? (direct file shares, not folder shares).
If yes, then it's the problem from owncloud/core#28197

[PVince81]

Desktop client version owncloud-client-2.3.2-1.5.x86_64 on openSUSE Tumbleweed. for me

[umgfoin]

are the files that don't sync received shared files ? (direct file shares, not folder shares).

No, unshared (instantUpload folder).
Although the error was still shown (periodically with every sync attempt), the files were correctly uploaded after a while and not on the first attempt.
Deleting and re-creating the file (in local filesystem), fixed the problem so far.

++umgfoin.

[PVince81]

Are these small files (< 10 MB) being overwritten by big files (> 10 MB) ?

[umgfoin]

Basically, they were created in the local file-system by photoshop (filesize > 10MB). It is possible, that the initial sync succeeded and the errors appeared after successively saving modifications. The activity log shows an initial creation-event, but no update-events. Additionally, I'm unsure if photoshop creates a file in an atomic operation or several open/close/append steps.

[guruz]

@umgfoin You found a client bug after all :-)

Let's close in favor of #5855

[guruz]

The nightly build for tomorrow should have this