svnsync via svn+ssh w/key authentication: password prompt

I am attempting to use svnsync over a SSH tunnel, which works, but always prompts for a password. I already setup ssh key authentication, which does work fine when performing svn commands.

I can establish a SSH tunnel with keys like this - no password prompts:
ssh servername

Using svn, I can do this without being prompted for a password:
svn list svn+ssh://servername/path/to/repos

However, this does prompt for a password:
svnsync sync svn+ssh://servername/path/to/repos

And just for good measure, this does the same thing:
svnsync sync svn+ssh://username@servername/path/to/repos

Any ideas of what I can do here to eliminate the password prompt? My goal is to automate a 'push' synchronization via hooks scripts.
Received on 2014-08-29 18:53:37 CEST