class EnvJujuClient24(EnvJujuClient):

    def _shell_environ(self, juju_home=None):
        """Generate a suitable shell environment.

        Juju's directory must be in the PATH to support plugins.
        """
        env = super(EnvJujuClient24, self)._shell_environ(juju_home)
        if env.get(JUJU_DEV_FEATURE_FLAGS) == "":
            env[JUJU_DEV_FEATURE_FLAGS] = 'actions'
        else:
            env[JUJU_DEV_FEATURE_FLAGS] += ',actions'

        if self.env.config.get('type') == 'cloudsigma':
            env[JUJU_DEV_FEATURE_FLAGS] += ',cloudsigma'
        return env