On Mon, 23 May 2011, Patrik Thunström wrote:
I thought I'd toss a question/issue report up a bit in the air. As I'm not exactly sure about what is the exact source/cause of the issue is, I'll start with it here, but it might very well be better suited for the LibSSH2 mailing list.
Thanks for the detailed write-up. Yes I believe it is a subject for the libssh2 list. I'll elaborate:
against libssh2 1.2.7 the issue is nowhere to be found. As soon as I tick this up to version 1.2.8 however, I immediately find the CURLE_PARTIAL_FILE issue as described.Is this an known issue, or is it a undocumented bug? It feels like it might be quite related to the read/write rewrite of libssh2
It feels very likely to be related with the SFTP rewrite of libssh2 in 1.2.8. I redid the whole "upper layer" parts of the lib to be able to get really high performance, which really wasn't possibly previously. libcurl really hasn't been modified for this, even if it can or should be to really make it possible to do high speed SFTP transfers. But on the other hand, it shouldn't have to be modified as it should still work unmodified, it is just not working as fast as it could.
The downside of my rewrite of the libssh2 SFTP code is that I introduced a bug that we've only got reports for on Windows (http://trac.libssh2.org/ticket/205) and nobody has been able to track it down and fix it properly. I don't use windows myself for development and debugging and despite my efforts I haven't managed to repeat this on Linux.
What possibly speaks against that your experienced problem is the exact same as this libssh2 issue #205 is the fact that you only got a libcurl CURLE_PARTIAL_FILE error and not something identifying a libssh2/SFTP problem which I otherwise would've thought you'd get if you got the #205 error.
In order to track this down, it will help if you can write a "pure" libssh2 program that repeats the problem at least with some level of certainty or compare your code with the code posted in #205 to see if they might be the same. Then work with us on the libssh2 list to debug it...
-- / daniel.haxx.se
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