# File src/ruby_supportlib/phusion_passenger/platform_info/ruby.rb, line 322
    def self.rvm_installation_mode
      if in_rvm?
        if ENV['rvm_path'] =~ /\.rvm/
          return :single
        else
          if GEM_HOME =~ /\.rvm/
            return :mixed
          else
            return :multi
          end
        end
      else
        return nil
      end
    end