code: def env_vars(self):
          
          if not self.no_libfaketime:
              faketime_filename = self.service_group.hitch_dir.faketime()
  
              env_vars = dict(os.environ)
              env_vars.update(self._env_vars)
              env_vars.update(faketime.get_environment_vars(faketime_filename))
          else:
              env_vars = dict(os.environ)
              env_vars.update(self._env_vars)
          return env_vars
docs: dict: All environment variables fed to the service.