Introduce config.json template file

Signed-off-by: Steffen Mueller <[email protected]>

README.md

@@ -71,7 +71,7 @@ reflect the base URL of a Dependency-Track server.
 ![Deployment Options](https://raw.githubusercontent.com/DependencyTrack/frontend/master/docs/images/Frontend-Deployment.svg?sanitize=true)
 
 The front-end is deployed to a general purpose web server (e.g. NGINX or Apache). To configure the front-end 
-for this scenario, simply change the value of API_BASE_URL in static/config.json.
+for this scenario, simply copy `static/config.tmpl.json` to `static/config.json` and change the value of API_BASE_URL in `static/config.json`.
 
 ```json
 {

docker/docker-entrypoint.sh

@@ -3,25 +3,21 @@
 set -e
 
 CONFIG_FILE="./static/config.json"
-TMP_FILE="/tmp/config.json"
+TEMPLATE_FILE="./static/config.tmpl.json"
 
-# Check if config.json is mounted
-if ! touch $CONFIG_FILE 2>/dev/null; then
-  echo "can not modify config.json - ENV configuration will be ignored"
+# Check if config.json exists
+if test -f $CONFIG_FILE; then
+  echo "config.json already exists - ENV variables will be ignored"
 else
-  # Apply ENV vars to temporary config.json
+  echo "Creating config.json using ENV variables"
   jq '.API_BASE_URL = env.API_BASE_URL
-        | .API_WITH_CREDENTIALS = env.API_WITH_CREDENTIALS 
+        | .API_WITH_CREDENTIALS = env.API_WITH_CREDENTIALS
         | .OIDC_ISSUER = env.OIDC_ISSUER
         | .OIDC_CLIENT_ID = env.OIDC_CLIENT_ID
         | .OIDC_SCOPE = env.OIDC_SCOPE
         | .OIDC_FLOW = env.OIDC_FLOW
         | .OIDC_LOGIN_BUTTON_TEXT = env.OIDC_LOGIN_BUTTON_TEXT' \
-    $CONFIG_FILE > $TMP_FILE
-
-  # Override default config file
-  mv -f $TMP_FILE $CONFIG_FILE
+    $TEMPLATE_FILE > $CONFIG_FILE
 fi
 
 exec "$@"
-