code: def enabled_actions_for_env(env):
      
      def enabled(config_value, required):
          if config_value is Config.TriBool.No:
              return False
          if config_value is Config.TriBool.Yes:
              return True
          assert config_value is Config.TriBool.IfNeeded
          return bool(required)
  
      # Some old Python versions do not support HTTPS downloads and therefore can
      # not download installation packages from PyPI. To run setuptools or pip
      # based installations on such Python versions, all the required
      # installation packages need to be downloaded locally first using a
      # compatible Python version (e.g. Python 2.4.4 for Python 2.4.3) and then
      # installed locally.
      download_supported = not ((2, 4, 3) <= env.sys_version_info < (2, 4, 4))
  
      local_install = config.installation_cache_folder() is not None
  
      actions = set()
  
      pip_required = False
      run_pip_based_installations = enabled(config.install_environments, True)
      if run_pip_based_installations:
          actions.add("run pip based installations")
          pip_required = True
      if download_supported and enabled(config.download_installations,
              local_install and run_pip_based_installations):
          actions.add("download pip based installations")
          pip_required = True
  
      setuptools_required = False
      run_pip_installation = enabled(config.install_environments, pip_required)
      if run_pip_installation:
          actions.add("run pip installation")
          setuptools_required = True
      if download_supported and enabled(config.download_installations,
              local_install and run_pip_installation):
          actions.add("download pip installation")
          setuptools_required = True
  
      if enabled(config.setup_setuptools, setuptools_required):
          actions.add("setup setuptools")
  
      return actions
docs: Returns actions to perform when processing the given environment.