#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2014 Filipe Manana.  All Rights Reserved.
#
# FS QA Test No. btrfs/054
#
# Regression test for a btrfs incremental send issue where the difference
# between the snapshots used by the incremental send consists of one of
# these cases:
#
# 1) First snapshot has a directory with name X and in the second snapshot
#    that directory doesn't exist anymore but a subvolume/snapshot with
#    the same name (X) exists;
#
# 2) First snapshot has a subvolume/snapshot with name X and in the second
#    snapshot that subvolume/snapshot doesn't exist anymore (might have been
#    replaced by a directory with the same name or not).
#
# This issue is fixed by the following linux kernel btrfs patches:
#
#    Btrfs: send, don't error in the presence of subvols/snapshots
#    Btrfs: set dead flag on the right root when destroying snapshot
#
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()
{
    rm -fr $send_files_dir
    rm -fr $tmp
}

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

# real QA test starts here
_supported_fs btrfs
_require_test
_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 >/dev/null 2>&1
_scratch_mount

mkdir $SCRATCH_MNT/testdir
_run_btrfs_util_prog subvolume create $SCRATCH_MNT/first_subvol

_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1

# Replace the directory testdir with a subvolume that has the same name.
rmdir $SCRATCH_MNT/testdir
_run_btrfs_util_prog subvolume create $SCRATCH_MNT/testdir

# Delete the subvolume first_subvol and create a directory with the same name.
_run_btrfs_util_prog subvolume delete $SCRATCH_MNT/first_subvol
mkdir $SCRATCH_MNT/first_subvol

_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap2

_run_btrfs_util_prog send -f $send_files_dir/1.snap $SCRATCH_MNT/mysnap1
_run_btrfs_util_prog send -p $SCRATCH_MNT/mysnap1 -f $send_files_dir/2.snap \
	$SCRATCH_MNT/mysnap2

_scratch_unmount
_check_scratch_fs

_scratch_mkfs >/dev/null 2>&1
_scratch_mount

_run_btrfs_util_prog receive -f $send_files_dir/1.snap $SCRATCH_MNT
[ -e $SCRATCH_MNT/first_subvol ] && \
	echo "Subvolume first_subvol was not supposed to be replicated by full send!"

_run_btrfs_util_prog receive -f $send_files_dir/2.snap $SCRATCH_MNT
[ -e $SCRATCH_MNT/testdir ] && \
	echo "Directory testdir was supposed to be deleted after incremental send!"

status=0
exit