apfstests/tests/overlay/011

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Red Hat Inc.  All Rights Reserved.
#
# FS QA Test 011
#
# test overlay private xattr on overlayfs with multiple lower dirs, all the
# lower layers except the lowest one should honor overlay private xattr
# "trusted.overlay", which means it should not be visible to user.
#
# Commit b581755b1c56 ("ovl: xattr filter fix") fixed this issue.
#
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
. ./common/attr

rm -f $seqres.full

# real QA test starts here
_supported_fs overlay
_supported_os Linux
_require_test
_require_scratch
_require_attrs trusted

# Remove all files from previous tests
_scratch_mkfs

# Create test dir on upper and make it opaque by setting proper xattr
lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
mkdir -p $lowerdir/testdir
mkdir -p $upperdir/testdir
$SETFATTR_PROG -n "trusted.overlay.opaque" -v "y" $upperdir/testdir

# mount overlay with multiple lowerdirs, with $lowerdir as the lowest dir and
# $upperdir overlaid on top of $lowerdir, so that "trusted.overlay.opaque"
# xattr should be honored and should not be listed
# mount readonly, because there's no upper and workdir
$MOUNT_PROG -t overlay -o ro -o lowerdir=$upperdir:$lowerdir $OVL_BASE_SCRATCH_MNT $SCRATCH_MNT

# Dump trusted.overlay xattr, we should not see the "opaque" xattr
_getfattr -d -m overlay $SCRATCH_MNT/testdir
echo "Silence is golden"

# success, all done
status=0
exit