update.sh

#!/bin/bash
set -Eeuo pipefail

# Source all versions
# shellcheck disable=SC1091
. ./versions.conf

DEFAULT_IFS=${IFS}
TEMPLATE_DOCKERFILE=template.Dockerfile
TMP_DOCKERFILE_FILE="/tmp/node_tmp_variant_Dockerfile"
TMP_FINAL_DOCKERFILE_FILE="/tmp/node_tmp_final_variant_Dockerfile"

declare -A VERSION_LIST
VERSION_LIST=(
    [20]="${NODE20_VERSION}"
    [22]="${NODE22_VERSION}"
)

VARIANTS_LIST='base nginx nginx-browsers'

# Get all parameter names to replace in Dockerfile
REPLACE_PARAMETERS=$(sed <versions.conf -e '/^#/d' -e '/^$/d' -e 's/export \(.*\)=.*/$\1/g' | tr '\n' ':'):\$NODE_VERSION

rm -rf build

function generated_warning() {
    cat <<-EOH
		#
		# NOTE:
		# THIS DOCKERFILE IS GENERATED VIA "update.sh".
		# PLEASE DO NOT EDIT IT DIRECTLY!
		# CHECK README FOR MORE INFO.
		#
	EOH
}

mkdir -p .github/workflows
cat docker.yml.template >.github/workflows/docker.yml

readarray -t VERSION_TAGS < <(printf '%s\n' "${!VERSION_LIST[@]}" | sort -V)
for version in "${VERSION_TAGS[@]}"; do
    NODE_VERSION_TAG="node${version//./}"
    NODE_VERSION=${VERSION_LIST[$version]}
    for VARIANT in ${VARIANTS_LIST}; do
        # Cleanup before script run
        rm -f ${TMP_DOCKERFILE_FILE}
        # Temporary variant dockerfile
        IFS='-'
        for type in ${VARIANT}; do
            variant_dockerfile_name="variant-${type}.Dockerfile"
            if [ -f "$variant_dockerfile_name" ]; then
                cat "$variant_dockerfile_name" >>${TMP_DOCKERFILE_FILE}
            fi
        done
        IFS=${DEFAULT_IFS}
        # Variables
        export NODE_VERSION_TAG
        export NODE_VERSION
        export VARIANT
        export BUILD_DIR="build/${NODE_VERSION_TAG}/${VARIANT}"
        TMP_VARIANT_TAG="${NODE_VERSION_TAG}-${VARIANT}"
        export VARIANT_TAG="${TMP_VARIANT_TAG//-base/}"
        TMP_GITHUB_JOB_ID="${NODE_VERSION_TAG}-${VARIANT}"
        export GITHUB_JOB_ID="${TMP_GITHUB_JOB_ID//_base/}"
        echo "Creating variant folder ${BUILD_DIR}"
        mkdir -p "${BUILD_DIR}"

        GENERATED_DOCKERFILE="${BUILD_DIR}/Dockerfile"
        echo "Generating dockerfile ${GENERATED_DOCKERFILE}"
        {
            generated_warning
            cat "${TEMPLATE_DOCKERFILE}"
        } >"${TMP_FINAL_DOCKERFILE_FILE}"

        gawk -i inplace -v dockerfile="${TMP_DOCKERFILE_FILE}" '
            $1 == "##</autogenerated>##" { ia = 0 }
            !ia { print }
            $1 == "##<autogenerated>##" { ia = 1; ac = 0; if (system("test -f " dockerfile) != 0) { ia = 0 } }
            ia { ac++ }
            ia && ac == 1 { system("cat " dockerfile) }
        ' "${TMP_FINAL_DOCKERFILE_FILE}"

        envsubst "${REPLACE_PARAMETERS}" <"${TMP_FINAL_DOCKERFILE_FILE}" >"${GENERATED_DOCKERFILE}"

        echo "Copying common config files to ${BUILD_DIR}"
        if [ -d "config/all" ]; then
            cp -ar config/all/. "${BUILD_DIR}"
        fi
        IFS='-'
        for type in ${VARIANT}; do
            if [ -d "config/all-${type}" ]; then
                echo "Copying common ${type} config files to ${BUILD_DIR}"
                cp -ar "config/all-${type}/." "${BUILD_DIR}"
            fi
        done

        echo "Copying common ${NODE_VERSION_TAG} config files to ${BUILD_DIR}"
        if [ -d "config/all-${version}" ]; then
            cp -ar "config/all-${version}/." "${BUILD_DIR}"
        fi
        IFS='-'
        for type in ${VARIANT}; do
            if [ -d "config/all-${version}-${type}" ]; then
                echo "Copying common ${NODE_VERSION_TAG} ${type} config files to ${BUILD_DIR}"
                cp -ar "config/all-${version}-${type}/." "${BUILD_DIR}"
            fi
        done

        for type in ${VARIANT}; do
            if [ -d "config/${type}" ]; then
                echo "Copying ${type} config files to ${BUILD_DIR}"
                cp -ar "config/${type}/." "${BUILD_DIR}"
            fi
        done

        for type in ${VARIANT}; do
            if [ -d "config/${version}-${type}" ]; then
                echo "Copying ${type} config files to ${BUILD_DIR}"
                cp -ar "config/${version}-${type}/." "${BUILD_DIR}"
            fi
        done
        IFS=${DEFAULT_IFS}

        envsubst "\
            \${GITHUB_JOB_ID} \
            \${BUILD_DIR} \
            \${NODE_VERSION_TAG} \
            \${VARIANT} \
            \${VARIANT_TAG} \
        " <docker.yml.job.template >>.github/workflows/docker.yml
        # Cleanup after script run
        rm -f ${TMP_DOCKERFILE_FILE}
    done
done