build.sh

#!/bin/bash

function __load_travisci_environment() {
  TAG=${TRAVIS_TAG}
  BRANCH=${TRAVIS_BRANCH}
  BUILD_NUMBER=${TRAVIS_BUILD_NUMBER}
  COMMIT=${TRAVIS_COMMIT}
}

function __load_circleci_environment() {
  TAG=${CIRCLE_TAG}
  BRANCH=${CIRCLE_BRANCH}
  BUILD_NUMBER=${CIRCLE_BUILD_NUM}
  COMMIT=${CIRCLE_SHA1}
}

function __load_github_actions_environment() {
  if [[ $GITHUB_REF == refs/heads/* ]]; then
    BRANCH=${GITHUB_REF#"refs/heads/"}
    TAG=""
  elif [[ $GITHUB_REF == refs/tags/* ]]; then
    TAG=${GITHUB_REF#"refs/tags/"}
    BRANCH=""
  fi
  BUILD_NUMBER=${GITHUB_RUN_NUMBER}
  COMMIT=${GITHUB_SHA}
}

dockerSetup() {
  if [ "$TRAVIS" = "true" ]; then
    __load_travisci_environment
  elif [ "$CIRCLECI" = "true" ]; then
    __load_circleci_environment
  elif [ "$GITHUB_ACTIONS" = "true" ]; then
    __load_github_actions_environment
  else
    echo "Could not detect CI environment"
    exit 1
  fi

  if [[ $* == *latest* ]]
  then
    echo "ERROR: 'latest' flag was removed - check the up-to-date docs"
    exit 2
  fi

  if [[ $* == *--skip-login* ]]
  then
    DO_LOGIN=0
  else
    DO_LOGIN=1
  fi

  local DEVELOPMENT_BRANCH="${DEV_BRANCH:-main}"

  if [[ -n "$TAG" ]]; then
    VERSION="$TAG (build $BUILD_NUMBER)"
    DOCKER_TAG="$TAG"
    DOCKER_TAG_AS_LATEST="true"

    if [[ "$DOCKER_TAG" =~ ^([0-9]+\.[0-9]+)\.[0-9]+$ ]]; then
      EXTRA_DOCKER_TAG=${BASH_REMATCH[1]}
    fi
  elif [[ -n "$BRANCH" ]]; then
    case $BRANCH in
      "$DEVELOPMENT_BRANCH")
        VERSION="dev-${COMMIT::7} (build $BUILD_NUMBER)"
        DOCKER_TAG="dev"
        ;;

      "$STABLE_BRANCH")
        VERSION="rc-${COMMIT::7} (build $BUILD_NUMBER)"
        DOCKER_TAG="rc"
        ;;

      release/*)
        VERSION="${BRANCH##release/}-dev-${COMMIT::7} (build $BUILD_NUMBER)"
        DOCKER_TAG="${BRANCH##release/}-dev"
        ;;

      preview/*)
        VERSION="${BRANCH##preview/}-${COMMIT::7} (build $BUILD_NUMBER)"
        DOCKER_TAG="${BRANCH##preview/}"
        ;;

      *) # if we couldn't set a DOCKER_TAG, stop setup
        return
    esac
  fi

  echo "Version: ${VERSION}"

  if [ $DO_LOGIN -eq 1 ]
  then
    # See https://stackoverflow.com/a/4775845/641451 for the `<<< "$VARIABLE"` syntax
    docker login --username="${DOCKER_USER}" --password-stdin "${DOCKER_REGISTRY}" <<< "${DOCKER_PASS}"
  fi
}

__dockerTagAndPush() {
  local EXTRA_TAG="${1}"
  local EXTRA_IMAGE="${REPO}:${EXTRA_TAG}"
  echo "Tagging also as $EXTRA_IMAGE"
  docker tag "${IMAGE}" "${EXTRA_IMAGE}"

  echo "Pushing ${EXTRA_IMAGE}"
  docker push "${EXTRA_IMAGE}"
}

dockerBuildAndPush() {
  if [[ -z "$DOCKER_TAG" ]]; then
    echo "Not building because DOCKER_TAG is undefined"
    return
  fi

  local REPO=$DOCKER_REPOSITORY
  local DIR="."
  local OPTIND
  local TAG_SUFFIX
  local BUILD_OPTS

  while getopts ":r:d:s:t:o:" opt "$@"; do
    case ${opt} in
      r)
        REPO=$OPTARG
        ;;

      s)
        REPO="${DOCKER_REPOSITORY}${OPTARG}"
        ;;

      d)
        DIR=$OPTARG
        ;;

      t)
        TAG_SUFFIX=$OPTARG
        ;;

      o)
        BUILD_OPTS=$OPTARG
        ;;

      *)
        ;;
    esac
  done

  local IMAGE="${REPO}:${DOCKER_TAG}${TAG_SUFFIX}"

  echo "Building image ${IMAGE} from ${DIR}"
  # shellcheck disable=SC2086
  docker build ${BUILD_OPTS} -t "${IMAGE}" "${DIR}"

  echo "Pushing ${IMAGE}"
  docker push "${IMAGE}"

  if [[ -n "$EXTRA_DOCKER_TAG" ]]; then
    __dockerTagAndPush "${EXTRA_DOCKER_TAG}${TAG_SUFFIX}"
  fi

  if [[ -n "$DOCKER_TAG_AS_LATEST" ]]; then
    __dockerTagAndPush "latest"
  fi
}