#!/usr/bin/env bash
#
# test of qemu-img convert -n - convert without creation
#
# Copyright (C) 2009 Red Hat, Inc.
# Copyright (C) 2013 Alex Bligh (alex@alex.org.uk)
#
# 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=alex@alex.org.uk

seq=`basename $0`
echo "QA output created by $seq"

status=1	# failure is the default!

_cleanup()
{
    _cleanup_test_img
    for img in "$TEST_IMG".{orig,raw1,raw2,target}; do
        _rm_test_img "$img"
    done
}
trap "_cleanup; exit \$status" 0 1 2 3 15

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

_supported_fmt qcow qcow2 vmdk qed raw
_supported_proto file
_unsupported_imgopts "subformat=monolithicFlat" \
                     "subformat=twoGbMaxExtentFlat" \
                     "subformat=twoGbMaxExtentSparse" \
                     "subformat=streamOptimized"

_make_test_img 4M

echo "== Testing conversion with -n fails with no target file =="
if $QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n "$TEST_IMG" "$TEST_IMG.orig" >/dev/null 2>&1; then
    exit 1
fi

echo "== Testing conversion with -n succeeds with a target file =="
_rm_test_img "$TEST_IMG.orig"
TEST_IMG="$TEST_IMG.orig" _make_test_img 4M
if ! $QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n "$TEST_IMG" "$TEST_IMG.orig" ; then
    exit 1
fi

echo "== Testing conversion to raw is the same after conversion with -n =="
# compare the raw files
if ! $QEMU_IMG convert -f $IMGFMT -O raw "$TEST_IMG" "$TEST_IMG.raw1" ; then
    exit 1
fi

if ! $QEMU_IMG convert -f $IMGFMT -O raw "$TEST_IMG.orig" "$TEST_IMG.raw2" ; then
    exit 1
fi

if ! cmp "$TEST_IMG.raw1" "$TEST_IMG.raw2" ; then
    exit 1
fi

echo "== Testing conversion back to original format =="
if ! $QEMU_IMG convert -f raw -O $IMGFMT -n "$TEST_IMG.raw2" "$TEST_IMG" ; then
    exit 1
fi
_check_test_img

echo "== Testing conversion to a smaller file fails =="
TEST_IMG="$TEST_IMG.target" _make_test_img 2M
if $QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n "$TEST_IMG" "$TEST_IMG.target" >/dev/null 2>&1; then
    exit 1
fi

echo "== Regression testing for copy offloading bug =="

_make_test_img 1M
TEST_IMG="$TEST_IMG.target" _make_test_img 1M
$QEMU_IO -c 'write -P 1 0 512k' -c 'write -P 2 512k 512k' "$TEST_IMG" | _filter_qemu_io
$QEMU_IO -c 'write -P 4 512k 512k' -c 'write -P 3 0 512k' "$TEST_IMG.target" | _filter_qemu_io
$QEMU_IMG convert -n -O $IMGFMT "$TEST_IMG" "$TEST_IMG.target"
$QEMU_IMG compare "$TEST_IMG" "$TEST_IMG.target"

echo "*** done"
rm -f $seq.full
status=0
exit 0