Fix ObjectStoreStorage#file_put_contents

[marcelklehr]

This is the same as #16397 but with a signed off commit.

[kesselb]

Thanks again 👍

server/lib/private/Files/ObjectStore/ObjectStoreStorage.php

Lines 295 to 303 in 06a1192

	case 'w':
	case 'wb':
	case 'w+':
	case 'wb+':
	$tmpFile = \OC::$server->getTempManager()->getTemporaryFile($ext);
	$handle = fopen($tmpFile, $mode);
	return CallbackWrapper::wrap($handle, null, null, function () use ($path, $tmpFile) {
	$this->writeBack($tmpFile, $path);
	});

Make sense somehow. A resource created by $this->fopen($path, 'w+'); uses a temporary file the LazyOpenStream can reuse later. Sounds hacky 💩 (not your code - the fact that we write all the data into a temp file and delete it later. there is a way to pass the raw data to s3 uploader but we don't expose this feature from the sdk to the IObjectStore interface).

[korelstar]

@MorrisJobke
Please backport this to Nextcloud 15 and 16, too.

[rullzer]

It looks sane indeed.
But there are a lot of failing tests.

[marcelklehr]

Superseded by #16440 (finally from my own fork, so I can force-push)