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bug#15905: 24.3; url-copy-file sometimes silently downloads garbage or i


From: Ryan
Subject: bug#15905: 24.3; url-copy-file sometimes silently downloads garbage or incomplete file
Date: Mon, 18 Nov 2013 12:30:49 -0800
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.1.0

On Mon Nov 18 11:52:16 2013, Ryan C. Thompson wrote:
On Mon 18 Nov 2013 11:13:18 AM PST, Ted Zlatanov wrote:
On Sat, 16 Nov 2013 20:53:41 -0800 Ryan <address@hidden> wrote:

R> On Sat Nov 16 15:27:18 2013, Ted Zlatanov wrote:
On Fri, 15 Nov 2013 08:13:13 -0800 Ryan <address@hidden> wrote:

R> In my experience, somewhere around 10% to 20% of the time the
R> downloaded file has some kind of anomaly. Anomalies that I have
R> observed so far include:

R> - the file is not completely retrieved;

R> - the file is complete, but has the following text appended:

0

- Peer has closed the GnuTLS connection

R> - the file contains only an HTTP header and nothing else:

HTTP/1.1 200 OK
Server: GitHub.com
Date: Thu, 14 Nov 2013 20:54:41 GMT
Content-Type: text/plain; charset=utf-8
Transfer-Encoding: chunked
Status: 200 OK
Strict-Transport-Security: max-age=31536000
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-UA-Compatible: chrome=1
Access-Control-Allow-Origin: https://render.github.com

R> In all cases, "url-copy-file" returns t as if the retrieval was
R> completely successful, so the only way to detect these anomalies
is to
R> inspect the file's content.

It's hard to tell from the bug report; can you tell us if your
Emacs is
compiled with the GnuTLS library?  (the output of `configure' would
help, or tell us where you got the binary).

R> I believe I got my Emacs from http://emacsformacosx.com/. I don't
know
R> the configuration details of it.

That build doesn't have GnuTLS support, so you're running an external
binary (`gnutls-cli' or something similar).  I haven't seen the problems
you report on Mac OS X (tried with the emacsformacosx build), so it may
be something specific to your system.  Can you see if any other users of
the emacsformacosx build can confirm the bug?

Ted

So, I just ran my own test case on my work machine (Ubuntu 13.04,
Emacs 24.2.1 lucid build from Ubuntu repos), and I did not see the
issue. I'm going to try compiling Emacs with gnutls support on my OSX
machine to see if that makes any difference.

I ran my test case with Emacs built from Macports, which compiles Emacs with GnuTLS support. On this Emacs, the test did not trigger the bug. I think we can say that the bug manifests when using an external gnutls-cli or similar.





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