class Bundler::CLI::Exec

def run
  Bundler.definition.validate_ruby!
  Bundler.load.setup_environment
  begin
    if RUBY_VERSION >= "2.0"
      @args << { :close_others => !options.keep_file_descriptors? }
    elsif options.keep_file_descriptors?
      Bundler.ui.warn "Ruby version #{RUBY_VERSION} defaults to keeping non-standard file descriptors on Kernel#exec."
    end
    # Run
    Kernel.exec(*args)
  rescue Errno::EACCES
    Bundler.ui.error "bundler: not executable: #{args.first}"
    exit 126
  rescue Errno::ENOENT
    Bundler.ui.error "bundler: command not found: #{args.first}"
    Bundler.ui.warn  "Install missing gem executables with `bundle install`"
    exit 127
  rescue ArgumentError
    Bundler.ui.error "bundler: exec needs a command to run"
    exit 128
  end
end