tests/overlay/035

#! /bin/bash
# FS QA Test 035
#
# Test cases that force read-only mount
#
# - No upper dir
# - Failure to create work dir
#
#-----------------------------------------------------------------------
# Copyright (C) 2017 CTERA Networks. All Rights Reserved.
# Author: Amir Goldstein <amir73il@gmail.com>
#
# 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"

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

_cleanup()
{
	cd /
	$CHATTR_PROG -i $workdir
	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
_supported_fs overlay
_supported_os Linux
# Use non-default scratch underlying overlay dirs, we need to check
# them explicity after test.
_require_scratch_nocheck
_require_chattr i

# Remove all files from previous tests
_scratch_mkfs

# Create multiple lowerdirs and upperdir, workdir
lowerdir1=$OVL_BASE_SCRATCH_MNT/lower1
lowerdir2=$OVL_BASE_SCRATCH_MNT/lower2
upperdir=$OVL_BASE_SCRATCH_MNT/upper
workdir=$OVL_BASE_SCRATCH_MNT/workdir
mkdir -p $lowerdir1 $lowerdir2 $upperdir $workdir

# Mount overlay with lower layers only.
# Verify that overlay is mounted read-only and that it cannot be remounted rw.
$MOUNT_PROG -t overlay -o"lowerdir=$lowerdir2:$lowerdir1" \
			$OVL_BASE_SCRATCH_MNT $SCRATCH_MNT
touch $SCRATCH_MNT/foo 2>&1 | _filter_scratch
_scratch_remount rw 2>&1 | _filter_ro_mount
$UMOUNT_PROG $SCRATCH_MNT

# Make workdir immutable to prevent workdir re-create on mount
$CHATTR_PROG +i $workdir

# Mount overlay with upper and workdir and expect failure to re-create workdir.
# Verify that overlay is mounted read-only and that it cannot be remounted rw.
_overlay_scratch_mount_dirs $lowerdir2 $upperdir $workdir
touch $SCRATCH_MNT/bar 2>&1 | _filter_scratch
_scratch_remount rw 2>&1 | _filter_ro_mount

# check overlayfs
_overlay_check_scratch_dirs $lowerdir2 $upperdir $workdir

# success, all done
status=0
exit