Add --dry-run support when renewing a lineage

letsencrypt/cli.py

@@ -404,6 +404,7 @@ def _auth_from_domains(le_client, config, domains):
         # https://github.com/letsencrypt/letsencrypt/pull/777/files#r40498574
         new_certr, new_chain, new_key, _ = le_client.obtain_certificate(domains)
         # TODO: Check whether it worked! <- or make sure errors are thrown (jdk)
+        if not config.dry_run:
             lineage.save_successor(
                 lineage.latest_common_version(), OpenSSL.crypto.dump_certificate(
                     OpenSSL.crypto.FILETYPE_PEM, new_certr.body.wrapped),
@@ -419,7 +420,7 @@ def _auth_from_domains(le_client, config, domains):
         if lineage is False:
             raise errors.Error("Certificate could not be obtained")
 
-    if lineage is not None:
+    if not config.dry_run:
         _report_new_cert(lineage.cert, lineage.fullchain)
 
     return lineage, action