language: bash

os: linux

services:
  - docker

matrix:
  include:
    # amd64
    - os: linux
      arch: amd64
      env:
        - DOCKERFILE="Dockerfile"
        - TAG_SUFFIX="latest"
        - ALT_SUFFIX="amd64"

    # arm32v5
    - os: linux
      arch: arm64
      env:
        - DOCKERFILE="Dockerfile.raspberry-pi"
        - TAG_SUFFIX="arm32v5"
        - ALT_SUFFIX="armhf"

script:
  - export TARGET_IMAGE_TAG=$(if [ "$TRAVIS_BRANCH" = "master" ]; then if [ "$TAG_SUFFIX" = "" ]; then echo "latest"; else echo "$TAG_SUFFIX"; fi; else if [ "$TAG_SUFFIX" = "" ]; then echo "$TRAVIS_BRANCH"; else echo "$TRAVIS_BRANCH-$TAG_SUFFIX"; fi; fi)
  - docker pull $TARGET_IMAGE:$TARGET_IMAGE_TAG && export IMAGE_CACHE="--cache-from $TARGET_IMAGE:$TARGET_IMAGE_TAG" || export IMAGE_CACHE=""
  - docker build -f $DOCKERFILE $IMAGE_CACHE -t $TARGET_IMAGE:$TARGET_IMAGE_TAG .
  - docker login --username $DOCKER_USERNAME --password $DOCKER_PASSWORD
  - docker push $TARGET_IMAGE:$TARGET_IMAGE_TAG

  # push alternate tags
  - if [ -z "$ALT_SUFFIX" ]; then
      echo "No alternate tags set for this build.";
    else
      echo "Tagging with alternate tag '$ALT_SUFFIX'";
      export ALT_IMAGE_TAG=$(if [ "$TRAVIS_BRANCH" = "master" ]; then if [ "$ALT_SUFFIX" = "" ]; then echo "error"; else echo "$ALT_SUFFIX"; fi; else if [ "$ALT_SUFFIX" = "" ]; then echo "$TRAVIS_BRANCH"; else echo "$TRAVIS_BRANCH-$ALT_SUFFIX"; fi; fi);
      docker tag $TARGET_IMAGE:$TARGET_IMAGE_TAG $TARGET_IMAGE:$ALT_IMAGE_TAG;
      docker push $TARGET_IMAGE:$ALT_IMAGE_TAG;
    fi