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[Duplicity-tracker] [bug #24741] ncftpls -x '' causes failure on Yahoo F

From: dAniel hAhler
Subject: [Duplicity-tracker] [bug #24741] ncftpls -x '' causes failure on Yahoo FTP server
Date: Mon, 03 Nov 2008 23:06:36 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/2008101315 Ubuntu/8.10 (intrepid) Firefox/3.0.3


                 Summary: ncftpls -x '' causes failure on Yahoo FTP server
                 Project: duplicity
            Submitted by: blueyed
            Submitted on: Mon 03 Nov 2008 11:06:34 PM GMT
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any



I'm forwarding a bug from Ubuntu (https://launchpad.net/bugs/245740):

Duplicity runs ncftpls like this:

 ncftpls -x '' -f t1 -F -t 30 ftp://ftp.agileskills2.org/

in which -x '' causes it to fail (exit code = 3, ie, transfer error), at
least on my
Yahoo ftp server. To fix it, I modified the file
/usr/lib/python2.5/site-packages/duplicity/backends.py and changed the
line from:

   commandline = "ncftpls -x '' %s '%s'" % \
                                          (self.flags, self.url_string)


   commandline = "ncftpls -x '-t' %s '%s'" % \
                                          (self.flags, self.url_string)


Yes, using 0.4.10-1 on Hardy.

Omitting -x entirely works.

I don't know what FTP server Yahoo uses. The output of the SYST FTP command

   UNIX Type: L8 Version: BSD-199506

However, isn't that an issue with ncftpls? If it finds -x has an empty
argument, it should
really not pass any extra ls argument to the remote site. In addition, in the
(http://tools.ietf.org/html/rfc959), I don't find a way to pass ls arguments
to the FTP
server at all! So this is really an implementation specific behavior that
can't be replied


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