$ ANSIBLE_NOCOWS=1 vagrant --provision
/home/iain/.vagrant.d/gems/gems/vagrant-share-1.1.4/lib/vagrant-share/activate.rb:8:in `rescue in <encoded>': vagrant-share can't be installed without vagrant login (RuntimeError)
from /home/iain/.vagrant.d/gems/gems/vagrant-share-1.1.4/lib/vagrant-share/activate.rb:5:in `<encoded>'
from /home/iain/.vagrant.d/gems/gems/vagrant-share-1.1.4/lib/vagrant-share/activate.rb:16:in `RGLoader_load'
from /home/iain/.vagrant.d/gems/gems/vagrant-share-1.1.4/lib/vagrant-share/activate.rb:16:in `<top (required)>'
from /home/iain/.vagrant.d/gems/gems/vagrant-share-1.1.4/lib/vagrant-share.rb:23:in `require'
from /home/iain/.vagrant.d/gems/gems/vagrant-share-1.1.4/lib/vagrant-share.rb:23:in `block in <class:Plugin>'
from /opt/vagrant/embedded/gems/gems/vagrant-1.6.3/lib/vagrant/cli.rb:75:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.6.3/lib/vagrant/cli.rb:75:in `block (2 levels) in help'
from /opt/vagrant/embedded/gems/gems/vagrant-1.6.3/lib/vagrant/registry.rb:48:in `block in each'
from /opt/vagrant/embedded/gems/gems/vagrant-1.6.3/lib/vagrant/registry.rb:47:in `each'
from /opt/vagrant/embedded/gems/gems/vagrant-1.6.3/lib/vagrant/registry.rb:47:in `each'
from /opt/vagrant/embedded/gems/gems/vagrant-1.6.3/lib/vagrant/cli.rb:69:in `block in help'
from /opt/vagrant/embedded/lib/ruby/2.0.0/optparse.rb:885:in `initialize'
from /opt/vagrant/embedded/gems/gems/vagrant-1.6.3/lib/vagrant/cli.rb:57:in `new'
from /opt/vagrant/embedded/gems/gems/vagrant-1.6.3/lib/vagrant/cli.rb:57:in `help'
from /opt/vagrant/embedded/gems/gems/vagrant-1.6.3/lib/vagrant/cli.rb:32:in `execute'
from /opt/vagrant/embedded/gems/gems/vagrant-1.6.3/lib/vagrant/environment.rb:252:in `cli'
from /opt/vagrant/bin/../embedded/gems/gems/vagrant-1.6.3/bin/vagrant:166:in `<main>'