apfstests/tests/overlay/022

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Red Hat Inc. All Rights Reserved.
#
# FS QA Test 022
#
# Regression test for kernel commit:
#     76bc8e2 ovl: disallow overlayfs as upperdir
#
# This reproducer was originally written by
#     Miklos Szeredi <mszeredi@redhat.com>
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

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

_cleanup()
{
	cd /
	$UMOUNT_PROG $tmp/mnt > /dev/null 2>&1
	rm -rf $tmp
	rm -f $tmp.*
}

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

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here

# Modify as appropriate.
_supported_fs overlay
_require_scratch

# Remove all files from previous tests
_scratch_mkfs

upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
mkdir -p $upperdir/upper
mkdir -p $upperdir/work
# mount overlay with dirs in upper
_scratch_mount

mkdir -p $tmp/{lower,mnt}
# mount overlay using upper from another overlay upper
# should fail
_overlay_mount_dirs $tmp/lower $SCRATCH_MNT/upper \
  $SCRATCH_MNT/work overlay $tmp/mnt > /dev/null 2>&1
if [ $? -ne 0 ] ; then
	echo "Silence is golden"
else
	echo "Test Fail"
	echo "Overlay upperdir can't be another overlay upperdir"
fi

# success, all done
status=0
exit