Handle missing dataproc-role metadata in hive-lineage.sh (#1371)

Replaces the `curl -f` call to the metadata server with the safer `/usr/share/google/get_metadata_value` utility to retrieve the `dataproc-role` attribute.

This change ensures the initialization action completes successfully even if the metadata key is not yet present, by using the standard Dataproc metadata helper and providing a fallback.

Author: codelixir

hive-lineage/hive-lineage.sh

@@ -52,7 +52,8 @@ function install_jars() {
 }
 
 function restart_hive_server2_master() {
-  ROLE=$(curl -f -s -H Metadata-Flavor:Google http://metadata/computeMetadata/v1/instance/attributes/dataproc-role)
+  # Safely get metadata without failing the script if the key is missing
+  ROLE=$(/usr/share/google/get_metadata_value attributes/dataproc-role || echo "Unknown")
   if [[ "${ROLE}" == 'Master' ]]; then
     echo "Restarting hive-server2"
     sudo systemctl restart hive-server2.service