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

[Ted Zlatanov]

On Sat, 16 Nov 2013 20:53:41 -0800 Ryan <rct@thompsonclan.org> wrote: 

R> On Sat Nov 16 15:27:18 2013, Ted Zlatanov wrote:
>> On Fri, 15 Nov 2013 08:13:13 -0800 Ryan <rct@thompsonclan.org> 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