Add a read-only check for orphaned service script

scripts/nomad_orphan_services.py

@@ -1,4 +1,5 @@
 #! /usr/bin/env python3
+from argparse import ArgumentParser
 from os import environ
 from typing import Any
 from typing import cast
@@ -31,6 +32,14 @@ def nomad_req(
         return response.text
 
 
+exit_code = 0
+parser = ArgumentParser(
+    description="Checks for orphaned services and optional deletes them.",
+)
+parser.add_argument("-d", "--delete", action="store_true", help="Delete orphan services")
+args = parser.parse_args()
+
+
 for namespace in nomad_req("services"):
     namespace = cast(dict[str, Any], namespace)
     for service in namespace["Services"]:
@@ -40,13 +49,22 @@ for namespace in nomad_req("services"):
             service_id = service_instance["ID"]
             alloc_id = service_instance["AllocID"]
 
+            alloc_found = True
+
             try:
                 alloc = nomad_req("allocation", alloc_id)
                 continue
             except requests.exceptions.HTTPError as e:
                 if e.response.status_code == 404:
+                    alloc_found = False
                     print(
                         f"alloc {alloc_id} not found for {service_name}. Deleting {service_id}"
                     )
-                    nomad_req("service", service_name, service_id, method="DELETE")
-                raise e
+                else:
+                    raise e
+
+            if not alloc_found and args.delete:
+                nomad_req("service", service_name, service_id, method="DELETE")
+
+
+exit(exit_code)