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Subject: Re: cURL uploads 0 length file for sftp transfer.
From: Yaakov Selkowitz <yselkowitz AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Date: Fri, 06 Sep 2019 16:17:59 -0400
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On Fri, 2019-09-06 at 19:44 +0000, ALbert via cygwin wrote:
> We recently upgraded cURL from version:curl 7.50.3 (i686-pc-cygwin)
> libcurl/7.50.3 OpenSSL/1.0.2j zlib/1.2.8 libidn/1.29 libpsl/0.14.0
> (+libidn/1.29) libssh2/1.7.0 nghttp2/1.14.0 to curl 7.64.1 (i686-pc-
> cygwin) libcurl/7.65.3 OpenSSL/1.1.1c zlib/1.2.11 brotli/1.0.7
> libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.0.4)
> libssh/0.8.7/openssl/zlib nghttp2/1.37.0

Am I reading this right, curl 7.64.1 with libcurl 7.65.3?  Those
versions should match exactly.

> Since the upgrade, we've seen problems uploading text files to sftp servers. Here's the call that we make:
> curl--trace-ascii trace.txt -k sftp://<user>:<pass>@<server>/file.txt-T file.txt
> 
> On initial call, a 0-length file is uploaded, with successful return code. On immediate rerun, a full file is uploaded (if we wait few minutes, 0-length file will get uploaded). Below are the traces from initial and subsequent calls. We also tried using same version curl on a linux box, without any issues. We also downloaded latest version of curl from curl for Windows, "curl 7.65.3 (i386-pc-win32) libcurl/7.65.3 OpenSSL/1.1.1c (Schannel) zlib/1.2.11 brotli/1.0.7 WinIDN libssh2/1.9.0 nghttp2/1.39.2", and its also working correctly.
> Unfortunately, the server we're uploading to belongs to a client, and we can't see if this is an issue on a server side. However, even if it was, why would linux curl and windows curl (from curl.haxx.se) would work correctly?
> Any help or pointers would be appreciated. Thank you.

Make sure you are using all the latest packages, especially that you
have the latest and matching versions of curl and libcurl, and try
again.

--
Yaakov


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