From 72d1c837356d85bdc597f4d246afffb68a0dac2e Mon Sep 17 00:00:00 2001
From: Ralph Bean <rbean@redhat.com>
Date: Fri, 15 Sep 2017 13:03:15 -0400
Subject: [PATCH] Complain early.

---
 module_build_service/config.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/module_build_service/config.py b/module_build_service/config.py
index 534b903a..d2a4ef0a 100644
--- a/module_build_service/config.py
+++ b/module_build_service/config.py
@@ -525,6 +525,11 @@ class Config(object):
         s = str(s)
         if s.lower() not in ('oidc', 'kerberos'):
             raise ValueError('Unsupported authentication method')
+        if s.lower() == 'kerberos':
+            try:
+                import ldap3
+            except ImportError:
+                raise ValueError("ldap3 is required for kerberos authz")
         self._auth_method = s.lower()
 
     def _setifok_kerberos_keytab(self, s):