.travis.yml

language: bash

services:
  - docker

env:
  - S6_ARCH=amd64 DOCKERFILE="Dockerfile" TAG_SUFFIX="amd64"
  - S6_ARCH=armhf DOCKERFILE="Dockerfile" TAG_SUFFIX="arm32v6" ALT_SUFFIX="armhf"
  - S6_ARCH=aarch64 DOCKERFILE="Dockerfile" TAG_SUFFIX="arm64v8" ALT_SUFFIX="aarch64"

script:
  - sudo apt-get --yes --no-install-recommends install binfmt-support qemu-user-static
  - docker run --rm --privileged multiarch/qemu-user-static:register --reset
  - 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 $IMAGE_CACHE --build-arg S6_ARCH=${S6_ARCH} -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

jobs:
  include:
    - stage: manifest
      script:
        # update docker to edge
        - sudo apt update -y
        - sudo apt install --only-upgrade docker-ce -y
        
        # enable experimental to use docker manifest command
        - mkdir $HOME/.docker
        - |-
          echo '{"experimental": "enabled"}' | tee $HOME/.docker/config.json
        - |-
          echo '{"experimental": true,"storage-driver": "overlay2","max-concurrent-downloads": 50,"max-concurrent-uploads": 50}' | sudo tee /etc/docker/daemon.json
        - sudo service docker restart

        # login
        - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
        
        # main
        - export MANIFEST_SUFFIX=$(if [ "$TRAVIS_BRANCH" = "master" ]; then echo "latest"; else echo "$TRAVIS_BRANCH"; fi)
        - export TAG_PREFIX=$(if [ "$TRAVIS_BRANCH" = "master" ]; then echo ""; else echo "$TRAVIS_BRANCH-"; fi)
        - docker manifest create $TARGET_IMAGE:$MANIFEST_SUFFIX $TARGET_IMAGE:${TAG_PREFIX}amd64 $TARGET_IMAGE:${TAG_PREFIX}arm32v6 $TARGET_IMAGE:${TAG_PREFIX}arm64v8
        - docker manifest annotate $TARGET_IMAGE:$MANIFEST_SUFFIX $TARGET_IMAGE:${TAG_PREFIX}arm32v6 --os=linux --arch=arm --variant=v6
        - docker manifest annotate $TARGET_IMAGE:$MANIFEST_SUFFIX $TARGET_IMAGE:${TAG_PREFIX}arm64v8 --os=linux --arch=arm64 --variant=v8
        - docker manifest push $TARGET_IMAGE:$MANIFEST_SUFFIX