Support ssh keys with passphrase applied

[legrego]

backport does not appear to support ssh keys that are protected by a passphrase. The process hangs indefinitely when trying to clone the repository. If I recreate my key without a passphrase applied, then the backport works perfectly.

I'm guessing that the git client is waiting for the passphrase to be entered via stdin, but backport doesn't expose/allow that to be entered via command line. It would be nice if we could enable this support, so users can protect their keys if they so choose.

System Config:

• OS: macOS High Sierra 10.13.3
• Git Client: 2.14.3 (Apple Git-98)

[sorenlouv]

This is a good point. I was looking at ways to capture interaction while working on #45 but didn't find any good way of doing it.

I would like it if backport could maintain control of the flow, so a password prompt doesn't suddenly appear (it also messes with the loading spinners).
However, it seems like I can't simply capture the output from an interactive shell like ssh with Node's child_process, and I need to use something like pty.js instead.

A workaround for you is to add your ssh key to the ssh-agent

[legrego]

Great idea about using the ssh-agent. I completely forgot about that option. Thanks!

[sorenlouv]

Good to hear the workaround solved it for now. Closing this for now in favor of #56