get_canonical_repo_name: Better handle HTTP errors

Signed-off-by: Stephen Gallagher <sgallagh@redhat.com>

src/centpkg/utils.py

@@ -18,8 +18,9 @@ import re
 import requests
 import sys
 from datetime import date, datetime
+from http import HTTPStatus
 from pyrpkg import rpkgError
-from requests.exceptions import ConnectionError
+from requests.exceptions import ConnectionError, HTTPError
 from configparser import NoOptionError, NoSectionError
 from urllib.parse import quote_plus, urlparse
 
@@ -229,6 +230,15 @@ def get_canonical_repo_name(config, repo_url):
         rv_json = rv.json()
 
         canonical_repo_name = rv_json['forked_from_project']['name']
+
+    except HTTPError as e:
+        # We got a 4xx or 5xx error code from the URL lookup
+        if e.response.status_code == HTTPStatus.FORBIDDEN:
+            raise rpkgError("Insufficient Gitlab API permissions. Missing token?")
+
+        # Other errors are unexpected, so re-raise them
+        raise
+
     except KeyError as e:
         # There was no 'forked_from_project' key, likely meaning the
         # user lacked permissions to read the API. Usually this means