copr-backend: cleanup-subscriptions: take a new access_token when needed

roles/copr/backend/templates/cleanup-unused-redhat-subscriptions

@@ -5,6 +5,7 @@ Periodically remove unused (staled, forgotten, orphaned, ...) entitlements from
 the 'copr-team' RHN account.
 """
 
+import argparse
 import logging
 import os
 import random
@@ -49,7 +50,18 @@ def _auth_headers(opts):
 
 def get_auth(url, opts):
     """ Get, with auth header """
-    return requests.get(url, headers=_auth_headers(opts))
+
+    if "access_token" not in opts or not opts["access_token"]:
+        get_access_token(opts)
+
+    response = None
+    for _ in range(2):
+        response = requests.get(url, headers=_auth_headers(opts))
+        if response.status_code == 401:
+            get_access_token(opts)
+            continue
+    return response
+
 
 def delete_auth(url, opts):
     """ Get, with auth header """
@@ -148,11 +160,15 @@ def drop_system(system, opts):
 
 
 def _main():
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--token-file", default=OFFLINE_TOKEN_FILE)
+    args = parser.parse_args()
+
     opts = {}
     opts["offline_token"] = None
-    with open(os.path.expanduser(OFFLINE_TOKEN_FILE), "r") as file:
+    with open(os.path.expanduser(args.token_file), "r") as file:
         opts["offline_token"] = file.read().strip()
-    get_access_token(opts)
     systems = get_systems(opts)
     remove_candidates = filter_out_systems(systems)
     for system in remove_candidates: