dynamic removal of a dep, based on a condition.rb

# dynamic removal of a dep requirement,
# based on a condition evaluated after previous requires have been processed
 
dep 'site' do
  requires [
    'system',
    'account',
    'site dir',
    'site options'
  ]
end
 
dep 'site options' do
  setup {
    definer.requires 'rvm user' if confirm "System ruby is #{shell 'ruby -v'}; do you want to install your own in an RVM?"
  }
end
 
dep 'rvm user' do
  # ...
end