Hello,
I just push a branch to dput-ng called 'progressbar' that contains a first
prototype for a progressbar (well, for the moment it just prints the percentage
of the file uploaded at the moment).

Given all the output in dput-ng is done via logger, there's no way to integrate
progressbar with logging, so that's done in a separate line.

the sftp is a preview of how a feedback on the upload could be done, if you like
(or have any suggestion on how to improve it) I can see to extend it to the
other uploaders (hoping they have a sort of callback mechanism as paramiko).

Regards,
Sandro