#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/110
#
# Test that sending and receiving snapshots across different filesystems works
# for full and incremental send operations.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -fr $send_files_dir
	rm -f $tmp.*
}

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

# real QA test starts here
_supported_fs btrfs
_require_scratch

send_files_dir=$TEST_DIR/btrfs-test-$seq

rm -f $seqres.full
rm -fr $send_files_dir
mkdir $send_files_dir

_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

# Create a test file
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 32K" $SCRATCH_MNT/foo | _filter_xfs_io

# Create the first snapshot.
_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap1

echo "File digest in the first filesystem, first snapshot:"
md5sum $SCRATCH_MNT/snap1/foo | _filter_scratch

# Save send stream for this snapshot.
_run_btrfs_util_prog send -f $send_files_dir/1.snap $SCRATCH_MNT/snap1

# Create a new filesystem and receive the snapshot.
_scratch_unmount
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

_run_btrfs_util_prog receive -f $send_files_dir/1.snap $SCRATCH_MNT

echo "File digest in the second filesystem, first snapshot:"
# Must match the digest we got in the first filesystem.
md5sum $SCRATCH_MNT/snap1/foo | _filter_scratch

# Snapshot the first snapshot as rw, modify this new snapshot and then snapshot
# it as RO to use in a send operation (send requires RO snapshots).
_run_btrfs_util_prog subvolume snapshot $SCRATCH_MNT/snap1 $SCRATCH_MNT/snap2_rw

$XFS_IO_PROG -c "pwrite -S 0xbb 4K 4K" \
	$SCRATCH_MNT/snap2_rw/foo | _filter_xfs_io

_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT/snap2_rw \
	$SCRATCH_MNT/snap2

echo "File digest in the second filesystem, second snapshot:"
md5sum $SCRATCH_MNT/snap2/foo | _filter_scratch

_run_btrfs_util_prog send -p $SCRATCH_MNT/snap1 -f $send_files_dir/2.snap \
	$SCRATCH_MNT/snap2

# Create a new filesystem and receive both the first snapshot, through the first
# send stream we created, and the second snapshot through the incremental send
# stream we just created. Verify this works and the file data is correct in both
# snapshots.
_scratch_unmount
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

_run_btrfs_util_prog receive -f $send_files_dir/1.snap $SCRATCH_MNT
# Receiving the second snapshot used to fail because the send stream used an
# incorrect value for the clone sources uuid field - it used the uuid of
# snapshot 1, which is different on each filesystem, instead of the received
# uuid value, which is preserved across different filesystems.
_run_btrfs_util_prog receive -f $send_files_dir/2.snap $SCRATCH_MNT

echo "File digests in the third filesystem:"
# Must match the digests we got in the previous filesystems.
md5sum $SCRATCH_MNT/snap1/foo | _filter_scratch
md5sum $SCRATCH_MNT/snap2/foo | _filter_scratch

status=0
exit