I use dput-ng to upload packages to a custom reprepro managed
repository. This repository uses a repository key protected by a
password. I configured dput-ng to run the following post_upload_command:

ssh -t reprepro@packages.lernstick.ch 'reprepro -V -V -b lernstick processincoming incoming'

After processing the incoming directory this command asks for the
archive key password to sign the new Release file. But because dput-ng
buffers all terminal output the password prompt is not visible. But it's
possible to blindly type the password and sign the file. After the
command finishes, dput-ng shows the complete command output including
the password prompts.

dput-ng should not buffer the output and display the prompt immediately.

Gaudenz