Drone 1.0.0-rc.1 git tag not work

Drone Support
1 
- name: alpine
  image: alpine
  environment:
    MAC_USER:
      from_secret: MAC_USER
  commands:
  - echo $MAC_USER
  - echo ${DRONE_BRANCH}/${DRONE_TAG}/${DRONE_COMMIT}
  - BUILD_DIR=.drone-ci-cd/${DRONE_REPO_OWNER}/${DRONE_REPO_NAME}/${DRONE_BUILD_NUMBER}
  - echo $BUILD_DIR
  - echo 'git clone -b ${DRONE_REPO_BRANCH} ${DRONE_REMOTE_URL} --recursive .'

+ echo $MAC_USER
********
+ BUILD_DIR=.drone-ci-cd/docker/drone/67
+ echo $BUILD_DIR
.drone-ci-cd/docker/drone/67
+ echo 'git clone -b master http://git.haitanyule.com/docker/drone.git --recursive .'
git clone -b master http://git.haitanyule.com/docker/drone.git --recursive .

- echo ${DRONE_BRANCH}/${DRONE_TAG}/${DRONE_COMMIT}

it doesn’t work.