ssh+pam replaced /root/.google-authenticator with a zero-sized file

Someone on the team managed to make ssh+pam+google authenticator to replace a good /root/.google-authenticator file with a zero-sized one.

I have no idea how they managed this but I have a log that you might find helpful:

[auth.log](https://github.com/google/google-authenticator-libpam/files/5029148/auth.log)

I suspect you guess what happened after .google-authenticator was zero-sized: no one could connect anymore on the that box: I had to use a console attached to the VM to put it back to a working state...