add init scripts to the wordpress image

bitnami/wordpress/4/rootfs/app-entrypoint.sh

@@ -7,6 +7,7 @@ print_welcome_page
 check_for_updates &
 
 if [[ "$1" == "nami" && "$2" == "start" ]] || [[ "$1" == "/init.sh" ]]; then
+  . /init.sh
   nami_initialize apache php mysql-client wordpress
   info "Starting wordpress... "
 fi

bitnami/wordpress/4/rootfs/init.sh

@@ -0,0 +1,29 @@
+##
+## @brief     Helper function to show an error when a password is empty and exit
+## param $1   Input name
+##
+empty_password_error() {
+  error "The $1 environment variable is empty or not set. Set the environment variable ALLOW_EMPTY_PASSWORD=yes to allow the container to be started with blank passwords. This is recommended only for development."
+  exit 1
+}
+
+##
+## @brief     Helper function to show a warning when the ALLOW_EMPTY_PASSWORD flag is enabled
+##
+empty_password_enabled_warn() {
+  warn "You set the environment variable ALLOW_EMPTY_PASSWORD=${ALLOW_EMPTY_PASSWORD}. For safety reasons, do not use this flag in a production environment."
+}
+
+# Validate passwords
+if [[ "$ALLOW_EMPTY_PASSWORD" =~ ^(yes|Yes|YES)$ ]]; then
+  empty_password_enabled_warn
+else
+  # Database creation by MySQL client
+  if [[ -n "$MYSQL_CLIENT_CREATE_DATABASE_USER" && -z "$MYSQL_CLIENT_CREATE_DATABASE_PASSWORD" ]]; then
+    empty_password_error MSQL_CLIENT_CREATE_DATABASE_PASSWORD
+  fi
+  # WordPress database
+  if [[ -z "$WORDPRESS_DATABASE_PASSWORD" ]]; then
+    empty_password_error WORDPRESS_DATABASE_PASSWORD
+  fi
+fi