Check if any of the Docker Swarm service template variables is empty

rootfs/docker-entrypoint.sh

@@ -23,6 +23,21 @@ export DOCKERSWARM_TASK_NAME=${DOCKERSWARM_TASK_NAME}
 export DOCKERSWARM_TASK_SLOT=${DOCKERSWARM_TASK_SLOT}
 export DOCKERSWARM_STACK_NAMESPACE=${DOCKERSWARM_STACK_NAMESPACE}
 
+# Check if any of the variables is empty
+if [ -z "$DOCKERSWARM_SERVICE_ID" ] || [ -z "$DOCKERSWARM_SERVICE_NAME" ] || [ -z "$DOCKERSWARM_NODE_ID" ] || [ -z "$DOCKERSWARM_NODE_HOSTNAME" ] || [ -z "$DOCKERSWARM_TASK_ID" ] || [ -z "$DOCKERSWARM_TASK_NAME" ] || [ -z "$DOCKERSWARM_TASK_SLOT" ] || [ -z "$DOCKERSWARM_STACK_NAMESPACE" ]; then
+  echo "==> Docker Swarm service template variables:"
+  echo "- DOCKERSWARM_SERVICE_ID=${DOCKERSWARM_SERVICE_ID}"
+  echo "- DOCKERSWARM_SERVICE_NAME=${DOCKERSWARM_SERVICE_NAME}"
+  echo "- DOCKERSWARM_NODE_ID=${DOCKERSWARM_NODE_ID}"
+  echo "- DOCKERSWARM_NODE_HOSTNAME=${DOCKERSWARM_NODE_HOSTNAME}"
+  echo "- DOCKERSWARM_TASK_ID=${DOCKERSWARM_TASK_ID}"
+  echo "- DOCKERSWARM_TASK_NAME=${DOCKERSWARM_TASK_NAME}"
+  echo "- DOCKERSWARM_TASK_SLOT=${DOCKERSWARM_TASK_SLOT}"
+  echo "- DOCKERSWARM_STACK_NAMESPACE=${DOCKERSWARM_STACK_NAMESPACE}"
+  echo "One or more variables is empty. Exiting..."
+  exit 1
+fi
+
 # Prometheus configuration file.
 PROMETHEUS_TSDB_PATH=${PROMETHEUS_TSDB_PATH:-"/prometheus/data"}
 PROMETHEUS_CONFIG_FILE=${PROMETHEUS_CONFIG_FILE:-"/etc/prometheus/prometheus.yml"}