[ -e /usr/local/bin/brew ] || ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
brew tap dustinparker/gitcac
brew install gitcac
exec bash -l
The installer will prompt you for your password a couple of times to run privileged actions. This is necessary to install CACKey and alter the system $PATH.
curl and git from homebrew might conflict. If you run into problems, try removing them first:
brew rm curl
brew rm git
To receive updates to gitcac, use:
brew update
brew upgrade
If you only want to update gitcac and nothing else:
brew upgrade /usr/local/Library/Taps/dustinparker/gitcac/*.rb
or
brew upgrade cackey gitcac{-curl,-git,}