qemu/tests/qemu-iotests/114

#!/usr/bin/env bash
# group: rw auto quick
#
# Test invalid backing file format in qcow2 images
#
# Copyright (C) 2014 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"

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

_supported_fmt qcow2
_supported_proto generic
# At least OpenBSD doesn't seem to have truncate
_supported_os Linux
# qcow2.py does not work too well with external data files
_unsupported_imgopts data_file

# Intentionally specify backing file without backing format; demonstrate
# the difference in warning messages when backing file could be probed.
# Note that only a non-raw probe result will affect the resulting image.
truncate -s $((64 * 1024 * 1024)) "$TEST_IMG.orig"
_make_test_img -b "$TEST_IMG.orig" 64M

TEST_IMG="$TEST_IMG.base" _make_test_img 64M
$QEMU_IMG convert -O qcow2 -B "$TEST_IMG.orig" "$TEST_IMG.orig" "$TEST_IMG"
_make_test_img -b "$TEST_IMG.base" 64M
_make_test_img -u -b "$TEST_IMG.base" 64M

# Set an invalid backing file format
$PYTHON qcow2.py "$TEST_IMG" add-header-ext 0xE2792ACA "foo"
_img_info

# Try opening the image. Should fail (and not probe) in the first case, but
# overriding the backing file format should be possible.
$QEMU_IO -c "open $TEST_IMG" -c "read 0 4k" 2>&1 | _filter_qemu_io | _filter_testdir
$QEMU_IO -c "open -o backing.driver=$IMGFMT $TEST_IMG" -c "read 0 4k" | _filter_qemu_io

# Rebase the image, to show that omitting backing format triggers a warning,
# but probing now lets us use the backing file.
$QEMU_IMG rebase -u -b "$TEST_IMG.base" "$TEST_IMG"
$QEMU_IO -c "open $TEST_IMG" -c "read 0 4k" 2>&1 | _filter_qemu_io | _filter_testdir

# success, all done
echo '*** done'
rm -f $seq.full
status=0