In 5.6, “Running Commands with the Capistrano Shell,” on my page(s) 138(-9), the authors direct the reader to clone massiveapp to a current directory that would appear to have a Vagrantfile (and other . files) already inside. So, the following command:
git clone -q email@example.com:deployingrails/massiveapp.git .
…results in failure…
fatal: destination path ‘.’ already exists and is not an empty directory.