# File lib/chef/knife/core/cookbook_scm_repo.rb, line 77
      def prepare_to_import(cookbook_name)
        branch = "chef-vendor-#{cookbook_name}"
        if branch_exists?(branch)
          ui.info("Pristine copy branch (#{branch}) exists, switching to it.")
          git("checkout #{branch}")
        else
          ui.info("Creating pristine copy branch #{branch}")
          git("checkout -b #{branch}")
        end
      end