Read-only on /dev/tty causes ssh-add to show passwords when typed and ssh'ing to new hosts to fail

[James Keener]

Lookin into it more I believe that readpassphrase falls back to stdin when /dev/tty isn't accessible.

I wonder if ssh-add could be more proactive by checking /dev/tty and the presence of $DISPLAY to provide a warning or abort with an error before calling readpassphrase. I didn't think ssh-add could fix a bad configuration :)

The issue is that I know there are many use cases for ssh-add (many of which i don't know) and being able to accommodate them all may be difficult.

Jim
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