Return an error code if any renewals fail

letsencrypt/cli.py

@@ -1030,6 +1030,12 @@ def renew(config, unused_plugins):
     _renew_describe_results(config, renew_successes, renew_failures,
                             renew_skipped, parse_failures)
 
+    if renew_failures or parse_failures:
+        raise errors.Error("{0} renew failure(s), {1} parse failure(s)".format(
+            len(renew_failures), len(parse_failures)))
+    else:
+        logger.debug("no renewal failures")
+
 
 def revoke(config, unused_plugins):  # TODO: coop with renewal config
     """Revoke a previously obtained certificate."""