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

[dAniel hAhler]

URL:
  <http://savannah.nongnu.org/bugs/?24741>

                 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

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Details:

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)

To:

   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
is:

   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
FTP RFC
(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
on.





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