Initialize WordPress during build time

rootfs/etc/cont-init.d/10-verify-wordpress

@@ -0,0 +1,67 @@
+#!/usr/bin/with-contenv 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() {
+  LAST_EXIT_CODE=$?
+  if [ "${LAST_EXIT_CODE}" = "0" ]; then
+    echo "> Script finished successfully"
+    exit "${LAST_EXIT_CODE}"
+  fi
+
+  echo "> Script finished with an error"
+  exit "${LAST_EXIT_CODE}"
+}
+
+# Applies patch for making WordPress updates impossible
+function disableUpdatesPatch() {
+  DISABLE_WP_UPDATES="${ENFORCE_DISABLE_WP_UPDATES:-true}"
+  if [ "${DISABLE_WP_UPDATES}" != "false" ]; then
+    echo "> Disabling WordPress updates..."
+    patch /var/www/html/wp-admin/update-core.php </etc/wp-mods/wp-admin-update-core.patch
+    echo "> Marking the patched file read-only..."
+    chmod 0440 /var/www/html/wp-admin/update-core.php
+  fi
+}
+
+# Main function
+function main() {
+  # 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.
+  WP_VERSION=$(echo "${WP_VERSION:?}" | sed --expression='s/.0$//g')
+
+  echo "> Verifying 'WordPress ${WP_VERSION}' installation..."
+  WP_INSTALLED_VERSION="$(wp core version)"
+
+  set -e
+
+  if [ -z "${WP_INSTALLED_VERSION}" ]; then
+    echo "> ERROR! WordPress installation does not seem to be present or valid. Continuing anyway..."
+    return 0
+  elif [ "${WP_INSTALLED_VERSION}" != "${WP_VERSION}" ]; then
+    echo "> WARNING! WordPress version mismatch"
+    echo "  Expected version: ${WP_VERSION}"
+    echo "  Detected version: ${WP_INSTALLED_VERSION}"
+    echo "> Seems like WordPress installation got updated outside image scope"
+    echo "  - This is dangerous as changes will not persist when container is recreated which might lead to inconsistencies between installation and the database."
+    echo "  - You should assume that recreating the container will render the website inoperable."
+    echo "  - Please make sure that you're running image: nlss/wordpress:${WP_VERSION}"
+    return 0
+  else
+    echo "> Identified 'WordPress ${WP_VERSION}'"
+
+    # This will apply patch once and again only if container is recreated
+    if [ ! -f "/var/www/patch-applied" ]; then
+        disableUpdatesPatch
+        touch "/var/www/patch-applied"
+    fi
+
+  fi
+}
+
+main "${@}"
+exit $?