ftps support using lftp (ftpsbackend)

[Marcel Pennewiß]

Hi,

this patch adds a new backend (ftpsbackend) which uses lftp. lftp (compared to ncftp) supports ftps (using gnutls or openssl-libs) as well as IPv6.

Because i'm neither a python pro nor a lftp pro this patch is a "works-for-me"-solution.

Known problems:
 - the destination directory will not be created if it missing while lftp has no support for automatic creation (afaik)

This patch works with duplicity-0.6.09.

[Marcel Pennewiß (mape2k)]

depending on the defaults of lftp maybe we should also add some new values for ssl-enabled connections
...
os.write(self.tempfile, "set ftp:ssl-allow true\n")
os.write(self.tempfile, "set ftp:ssl-protect-data true\n")
os.write(self.tempfile, "set ftp:ssl-protect-list true\n")
...

[Martin Pool (mbp)]

To me the patch looks basically reasonable. It seems like it would need doc and news updates. The code says this is an implementation for FTP which is I guess wrong - this is FTP-over-SSL.

[edso (ed.so)]

we should consider to make it an alternative to ncftp. So people have an alternative ftp backend in case ncftp for some weird reason does not work in combination with their target ftpd.

maybe lftp+ftp[s] vs ncftp+ftp... ede

[edso (ed.so)]

e.g. this bug https://bugs.launchpad.net/duplicity/+bug/486241