qemu-iotests: Test unknown qcow2 header extensions

The immportant thing here is that header extensions don't get silently
dropped when the header is rewritten, e.g. during a rebase.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/031

@@ -0,0 +1,72 @@
+#!/bin/bash
+#
+# Test that all qcow2 header extensions survive a header rewrite
+#
+# Copyright (C) 2011 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=kwolf@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+_cleanup()
+{
+	_cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+. ./common.pattern
+
+# This tests qcow2-specific low-level functionality
+_supported_fmt qcow2
+_supported_proto generic
+_supported_os Linux
+
+CLUSTER_SIZE=65536
+echo
+echo === Create image with unknown header extension ===
+echo
+_make_test_img 64M
+./qcow2.py $TEST_IMG add-header-ext 0x12345678 "This is a test header extension"
+./qcow2.py $TEST_IMG dump-header
+_check_test_img
+
+echo
+echo === Rewrite header with no backing file ===
+echo
+$QEMU_IMG rebase -u -b "" $TEST_IMG
+./qcow2.py $TEST_IMG dump-header
+_check_test_img
+
+echo
+echo === Add a backing file and format ===
+echo
+$QEMU_IMG rebase -u -b "/some/backing/file/path" -F host_device $TEST_IMG
+./qcow2.py $TEST_IMG dump-header
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0