apfstests/tests/overlay/003

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Red Hat Inc. All Rights Reserved.
#
# FS QA Test 003
#
# Test overlayfs basic whiteout.
#
# Overlayfs whiteout can be visible if underlying upper fs does not
# support d_type. Kernel commit
#	45aebea (ovl: Ensure upper filesystem supports d_type)
# prevents mounting overlayfs like this since v4.6-rc1.
# No harm to keep this test as a sanity check.
#
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 /
	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
_supported_os Linux
_require_scratch

# Remove all files from previous tests
_scratch_mkfs

# Create test files dirs in lower dir
lowerdir=${OVL_BASE_SCRATCH_MNT}/${OVL_LOWER}
mkdir -p $lowerdir

touch ${lowerdir}/test_file
ln -s ${lowerdir}/test_file ${lowerdir}/test_softlink_file
ln ${lowerdir}/test_file ${lowerdir}/test_hardlink_file

mkdir -p ${lowerdir}/test_dir
ln -s ${lowerdir}/test_dir ${lowerdir}/test_softlink_dir

mknod ${lowerdir}/test_cdev c 2 3
ln -s ${lowerdir}/test_cdev ${lowerdir}/test_softlink_cdev
ln ${lowerdir}/test_cdev ${lowerdir}/test_hardlink_cdev

mknod ${lowerdir}/test_bdev b 2 4
ln -s ${lowerdir}/test_bdev ${lowerdir}/test_softlink_bdev
ln ${lowerdir}/test_bdev ${lowerdir}/test_hardlink_bdev

mknod ${lowerdir}/test_pipe p
ln -s ${lowerdir}/test_pipe ${lowerdir}/test_softlink_pipe
ln ${lowerdir}/test_pipe ${lowerdir}/test_hardlink_pipe

_scratch_mount

# whiteout all files in overlay mountpoint
rm -rf ${SCRATCH_MNT}/*
# nothing should be listed
ls ${SCRATCH_MNT}/

# unmount overlayfs but not base fs
$UMOUNT_PROG $SCRATCH_MNT

echo "Silence is golden"
# success, all done
status=0
exit