push

#!/bin/bash
# @see https://docs.docker.com/docker-hub/builds/advanced/#build-hook-examples

# Checks DOCKER_TAG.
# This code supports DOCKER_TAG 'latest' only in current specification.
check_docker_tag() {
    # @see https://github.com/docker/hub-feedback/issues/1457#issuecomment-415030262
    # @see https://stackoverflow.com/questions/34789149/bash-control-statement-double-forward-slash
    # @see https://stackoverflow.com/questions/918886/how-do-i-split-a-string-on-a-delimiter-in-bash/5257398#5257398
    docker_tags=(${DOCKER_TAG//,/ })

    latest=false
    # @see https://stackoverflow.com/questions/3685970/check-if-a-bash-array-contains-a-value/15394738#15394738
    if [[ " ${docker_tags[@]} " =~ ' latest ' ]]; then
        latest=true
        # @see https://stackoverflow.com/questions/16860877/remove-an-element-from-a-bash-array/16861932#16861932
        delete=(latest)
        docker_tags=${docker_tags[@]/$delete}
    fi
}

# Runs matrix push.
# @see https://blog.thesparktree.com/docker-hub-matrix-builds
run_matrix_push() {
    while read software_version_line; do
        wordpress_version=$(echo "${software_version_line}" | cut -d ',' -f 1)
        php_image_tag=$(echo "${software_version_line}" | cut -d ',' -f 2)
        image_tag="${DOCKER_REPO}:${wordpress_version}-php${php_image_tag}"

        docker push "${image_tag}"
    done < software-versions.txt
}

# Tags image which defined by first line of software-versions.txt as latest.
tag_and_push_latest() {
    latest_software_version=$(cat software-versions.txt | head -n 1)
    wordpress_version=$(echo "${latest_software_version}" | cut -d ',' -f 1)
    php_image_tag=$(echo "${latest_software_version}" | cut -d ',' -f 2)
    docker tag "${DOCKER_REPO}:${wordpress_version}-php${php_image_tag}" "${DOCKER_REPO}:latest"
    docker push "${DOCKER_REPO}:latest"
}

check_docker_tag
run_matrix_push
if [ "$latest" = true ] ; then
    tag_and_push_latest
fi