class Bundler::Source::Git

def install(spec)
  Bundler.ui.debug "  * Using git #{uri}"
  if @installed
    Bundler.ui.debug "  * Already checked out revision: #{ref}"
  else
    Bundler.ui.debug "  * Checking out revision: #{ref}"
    checkout
    @installed = true
  end
  generate_bin(spec)
end