wordpress/rootfs/etc/s6-overlay/s6-rc.d/init-verify-wordpress/run

#!/command/with-contenv bash
# shellcheck shell=bash

# Designed to replace original, overcomplicated entrypoint script from official wordpress docker repository
# Why not use already available tools instead?!

# Register exit handler
trap scriptExitHandler EXIT

function scriptExitHandler() {
    local lastExitCode=$?
    if [ "${lastExitCode}" = "0" ]; then
        echo "Script finished successfully"
        exit "${lastExitCode}"
    fi

    echo "Script finished with an error"
    exit "${lastExitCode}"
}

function reportUnhealthy() {
    echo "${1:?REASON is required}" >"/tmp/.wp-unhealthy"
}

# init-verify-wordpress main
function main() {

    exec > >(while read line; do echo "[init-verify-wordpress] ${line}"; done) 2>&1

    local wpCurrentVersion
    local wpInstalledVersion

    # Removes trailing zero if found
    # This is required due to inconsistencies between WodPress docker image versioning and wp-cli core download
    # If patch version is 0, it is not considered by wp-cli.
    wpCurrentVersion=$(echo "${WP_VERSION:?}" | sed --expression='s/.0$//g')

    echo "Verifying 'WordPress ${wpCurrentVersion}' installation..."
    wpInstalledVersion="$(wp core version)"

    set -e

    rm -f "/tmp/.wp-unhealthy"
    if [ -z "${wpInstalledVersion}" ]; then
        echo "Error: WordPress installation does not seem to be present or valid. Continuing anyway..."

        reportUnhealthy "WP_NOT_PRESENT"
        return 0
    elif [ "${wpInstalledVersion}" != "${wpCurrentVersion}" ]; then
        echo "WARNING! WordPress version mismatch"
        echo " Expected version: ${wpCurrentVersion}"
        echo " Detected version: ${wpInstalledVersion}"
        echo "Seems like WordPress installation got updated outside image scope"
        echo " - This is dangerous as changes will not persist when container is recreated which might lead to inconsistencies between installation and the database."
        echo " - You should assume that recreating the container will render the website inoperable."
        echo " - Please make sure that you're running image: nlss/wordpress:${wpCurrentVersion}"
        reportUnhealthy "WP_VERSION_MISMATCH"
        return 0
    fi

    echo "Identified 'WordPress ${wpCurrentVersion}'"
}

main "${@}"