如何在构建时将环境变量设置为Docker映像名称

Question

When using the file circle.yml file to build a docker image I'm trying to pass an environment variable $CIRCLE_PROJECT_USERNAME so that the file is less project specific. Unfortunately Docker build with the tag argument -t fails with:

docker build -t CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME:$CIRCLE_BRANCH . returned exit code 1

repository name component must match "[a-z0-9]+(?:[._-][a-z0-9]+)*" Action failed: docker build -t CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME:$CIRCLE_BRANCH .

Circle.yml file:

machine:
  environment:
  services:
    - docker

dependencies:
  override:
    - docker info
    - docker build -t CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME:$CIRCLE_BRANCH .

test:
  override:
    - docker run -d $CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME:$CIRCLE_BRANCH

deployment:
  hub:
    branch: master
    commands:
      - docker login -e $DOCKER_EMAIL -u $DOCKER_USER -p $DOCKER_PASSWORD
      - docker push $CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME:$CIRCLE_BRANCH

deployment:
  hub:
    branch: develop
    commands:
      - docker login -e $DOCKER_EMAIL -u $DOCKER_USER -p $DOCKER_PASSWORD
      - docker push $CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME:$CIRCLE_BRANCH

Answer 1

Should work, check if the env are actually set and only contain allowed characters:

[a-z0-9]+(?:[._-][a-z0-9]+)*

Edit:

docker build -t CIRCLE_PROJECT_USERNAME ...

Maybe just missing a $ here? ;)