Skip the xfer test when Net::DNS is too old

This allows the system tests to run to completion on macOS
without requiring extra modules from CPAN.

diff --git a/bin/tests/system/xfer/prereq.sh b/bin/tests/system/xfer/prereq.sh
new file mode 100644 (file)
index 0000000..c7b7828
--- /dev/null
+++ b/bin/tests/system/xfer/prereq.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# SPDX-License-Identifier: MPL-2.0
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0.  If a copy of the MPL was not distributed with this
+# file, you can obtain one at https://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+. ../conf.sh
+
+# macOS ships with Net::DNS 0.74 which does not work with
+# HMAC-SHA256, despite the workarounds in ans.pl
+
+if perl -MNet::DNS -e 'exit $Net::DNS::VERSION >= 1.0'
+then
+       version=$(perl -MNet::DNS -e 'print $Net::DNS::VERSION')
+       echo_i "perl Net::DNS $version is too old - skipping xfer test"
+       exit 1
+fi
+
+exit 0