#! /bin/bash
# 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
#
#-----------------------------------------------------------------------
# Copyright (c) 2014 Filipe Manana.  All Rights Reserved.
#
# 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.
#
# This program is distributed in the hope that it would 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, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------
#

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
_supported_os Linux
_require_scratch
_need_to_be_root

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

_scratch_unmount
_check_scratch_fs

_scratch_mkfs >/dev/null 2>&1
_scratch_mount

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

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

status=0
exit