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#!/bin/bash
#
# Test that temporary backing file overrides (on the command line or in
# blockdev-add) don't replace the original path stored in the image during
# header updates.
#
# Copyright (C) 2015 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_qemu
    _cleanup_test_img
}
trap "_cleanup; exit \$status" 0 1 2 3 15

# get standard environment, filters and checks
. ./common.rc
. ./common.filter
. ./common.qemu

_supported_fmt qcow2
_supported_proto generic
_unsupported_proto vxhs
_supported_os Linux
# We are going to use lazy-refcounts
_unsupported_imgopts 'compat=0.10'

qemu_comm_method="monitor"


TEST_IMG="$TEST_IMG.orig" _make_test_img 64M
TEST_IMG="$TEST_IMG.base" _make_test_img 64M
_make_test_img 64M
_img_info | _filter_img_info

echo
echo "=== HMP commit ==="
echo
# bdrv_make_empty() involves a header update for qcow2

# Test that a backing file isn't written
_launch_qemu -drive id=testdisk,file="$TEST_IMG",backing.file.filename="$TEST_IMG.base"
_send_qemu_cmd $QEMU_HANDLE "commit testdisk" "(qemu)"
_send_qemu_cmd $QEMU_HANDLE '' '(qemu)'
_cleanup_qemu
_img_info | _filter_img_info

# Make sure that if there was a backing file that was just overridden on the
# command line, that backing file is retained, with the right format
_make_test_img -F raw -b "$TEST_IMG.orig" 64M
_launch_qemu -drive id=testdisk,file="$TEST_IMG",backing.file.filename="$TEST_IMG.base",backing.driver=$IMGFMT
_send_qemu_cmd $QEMU_HANDLE "commit testdisk" "(qemu)"
_send_qemu_cmd $QEMU_HANDLE '' '(qemu)'
_cleanup_qemu
_img_info | _filter_img_info

echo
echo "=== Marking image dirty (lazy refcounts) ==="
echo

# Test that a backing file isn't written
_make_test_img 64M
$QEMU_IO -c "open -o backing.file.filename=$TEST_IMG.base,lazy-refcounts=on $TEST_IMG" -c "write 0 4k" | _filter_qemu_io
_img_info | _filter_img_info

# Make sure that if there was a backing file that was just overridden on the
# command line, that backing file is retained, with the right format
_make_test_img -F raw -b "$TEST_IMG.orig" 64M
$QEMU_IO -c "open -o backing.file.filename=$TEST_IMG.base,backing.driver=$IMGFMT,lazy-refcounts=on $TEST_IMG" -c "write 0 4k" | _filter_qemu_io
_img_info | _filter_img_info

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