#!/bin/sh
# Writes the runtime configuration the page reads before the bundle runs, then
# hands over to nginx.
#
# The front end is built once and served by many environments, so anything that
# differs between them has to be resolved here rather than baked into the bundle.
# Right now that is the origin of the theme service; an empty value leaves the
# application on its own styling.
set -eu

CONFIG_DIR=/usr/share/nginx/html
CONFIG_FILE="$CONFIG_DIR/runtime-config.js"

# nginx serves its own error pages from this directory, so a read-only filesystem
# would otherwise turn a missing file into a 500. The default is already in the
# image, so this only replaces it.
cat > "$CONFIG_FILE" <<CONFIG
window.__GO_GUESS_CONFIG__ = { themeBaseUrl: "${THEME_BASE_URL:-}" }
CONFIG

exec "$@"