Trying to use fedora-review -b for the first time, without being in the mock group, but mock installed, fedora-review just prompts for a password without stating what the password is for.
With help from mhroncok on #fedora-devel I finally figured out that I needed to be in the mock group.
Some improved error message and documentation about this would be awesome
mock normally prints the following:
You are not in the `mock` group. See https://github.com/rpm-software-management/mock/wiki#setup Authenticating as "root" Password:
(See https://github.com/rpm-software-management/mock/issues/244)
But I guess the message is on stderr and FedoraReview eats it. Wither the stderr should be preserved or FedoraReview should do the check before attempting to run mock.