#!/usr/bin/env bash
#
# Test resizing a qcow2 image with a backing file
#
# Copyright (C) 2020 Igalia, S.L.
# Author: Alberto Garcia <berto@igalia.com>
#
# 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=berto@igalia.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 file
_supported_os Linux
# We need qemu-img map to show the file where the data is allocated,
# but with an external data file, it will show that instead of the
# file we want to check.  So just skip this test for external data
# files.
_unsupported_imgopts data_file

echo '### Create the backing image'
BACKING_IMG="$TEST_IMG.base"
TEST_IMG="$BACKING_IMG" _make_test_img 1M

echo '### Fill the backing image with data (0x11)'
$QEMU_IO -c 'write -P 0x11 0 1M' "$BACKING_IMG" | _filter_qemu_io

echo '### Create the top image'
_make_test_img -F "$IMGFMT" -b "$BACKING_IMG"

echo '### Fill the top image with data (0x22)'
$QEMU_IO -c 'write -P 0x22 0 1M' "$TEST_IMG" | _filter_qemu_io

# Both offsets are part of the same cluster.
echo '### Shrink the image to 520k'
$QEMU_IMG resize --shrink "$TEST_IMG" 520k
echo '### Grow the image to 567k'
$QEMU_IMG resize "$TEST_IMG" 567k

echo '### Check that the tail of the image reads as zeroes'
$QEMU_IO -c 'read -P 0x22    0 520k' "$TEST_IMG" | _filter_qemu_io
$QEMU_IO -c 'read -P 0x00 520k  47k' "$TEST_IMG" | _filter_qemu_io

echo '### Show output of qemu-img map'
$QEMU_IMG map "$TEST_IMG" | _filter_testdir

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