#!/bin/sh
# Renders /app/config.json from config.json.tmpl at container start.
#
# The homeserver URL and server_name differ per environment, and config.json is
# read by the browser rather than the build, so baking it into the image would
# mean one image per environment. Dropped into /docker-entrypoint.d, which the
# upstream nginx entrypoint runs (in lexical order) before starting nginx —
# no ENTRYPOINT override, so the image's own startup work still happens.
set -eu

: "${MATRIX_PUBLIC_BASEURL:?MATRIX_PUBLIC_BASEURL is required}"
: "${MATRIX_SERVER_NAME:?MATRIX_SERVER_NAME is required}"
: "${ELEMENT_PUBLIC_URL:?ELEMENT_PUBLIC_URL is required}"

envsubst '${MATRIX_PUBLIC_BASEURL} ${MATRIX_SERVER_NAME} ${ELEMENT_PUBLIC_URL}' \
  < /app/config.json.tmpl > /app/config.json

echo "element-config: homeserver ${MATRIX_PUBLIC_BASEURL} (${MATRIX_SERVER_NAME})"