apfstests/tests/overlay/045

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Huawei.  All Rights Reserved.
#
# FS QA Test No. 045
#
# Test fsck.overlay how to deal with whiteouts in overlayfs.
#
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

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

# real QA test starts here
_supported_fs overlay
_supported_os Linux
_require_scratch_nocheck
_require_attrs trusted
_require_command "$FSCK_OVERLAY_PROG" fsck.overlay

OVL_XATTR_OPAQUE_VAL=y
OVL_XATTR_IMPURE_VAL=y

# remove all files from previous tests
_scratch_mkfs

# Check whiteout
check_whiteout()
{
	for arg in $*; do
		local ttype=`stat -c "%F:%t,%T" $arg`

		[[ "$ttype" == "character special file:0,0" ]] || \
			echo "Valid whiteout removed incorrectly"
	done
}

# Create a whiteout
make_whiteout()
{
	for arg in $*; do
		mknod $arg c 0 0
	done
}

# Create an opaque directory
make_opaque_dir()
{
	local target=$1

	mkdir -p $target
	$SETFATTR_PROG -n $OVL_XATTR_OPAQUE -v $OVL_XATTR_OPAQUE_VAL $target
}

# Create impure directories
make_impure_dir()
{
	for dir in $*; do
		mkdir -p $dir
		$SETFATTR_PROG -n $OVL_XATTR_IMPURE -v $OVL_XATTR_IMPURE_VAL $dir
	done
}

# Create a redirect directory
make_redirect_dir()
{
	local target=$1
	local value=$2

	mkdir -p $target
	$SETFATTR_PROG -n $OVL_XATTR_REDIRECT -v $value $target
}

# Create test directories
lowerdir=$OVL_BASE_SCRATCH_MNT/lower
lowerdir2=$OVL_BASE_SCRATCH_MNT/lower2
upperdir=$OVL_BASE_SCRATCH_MNT/upper
workdir=$OVL_BASE_SCRATCH_MNT/workdir

make_test_dirs()
{
	rm -rf $lowerdir $lowerdir2 $upperdir $workdir
	mkdir -p $lowerdir $lowerdir2 $upperdir $workdir
}

# Test orphan whiteout in lower and upper layer, should remove
echo "+ Orphan whiteout"
make_test_dirs
make_whiteout $lowerdir/foo $upperdir/{foo,bar}

_overlay_fsck_expect $FSCK_NONDESTRUCT $lowerdir $upperdir $workdir -p
ls $lowerdir
ls $upperdir

# Test valid whiteout covering lower target, should not remove
echo "+ Valid whiteout"
make_test_dirs
touch $lowerdir2/{foo,bar}
make_whiteout $upperdir/foo $lowerdir/bar

_overlay_fsck_expect $FSCK_OK "$lowerdir:$lowerdir2" $upperdir $workdir -p
check_whiteout $upperdir/foo $lowerdir/bar

# Test orphan whiteout in opaque directory, should remove
echo "+ Orphan whiteout(2)"
make_test_dirs
mkdir $lowerdir/testdir
touch $lowerdir/testdir/foo
make_opaque_dir $upperdir/testdir
make_whiteout $upperdir/testdir/foo

_overlay_fsck_expect $FSCK_NONDESTRUCT $lowerdir $upperdir $workdir -p
ls $upperdir/testdir

# Test orphan whiteout whose parent path is not an merged directory,
# should remove
echo "+ Orphan whiteout(3)"
make_test_dirs
mkdir $lowerdir2/{testdir1,testdir2,testdir3}
touch $lowerdir2/{testdir1/foo,testdir2/foo,testdir3/foo}
mkdir $upperdir/{testdir1,testdir2,testdir3,testdir4}
touch $lowerdir/testdir1
make_whiteout $lowerdir/testdir2
make_opaque_dir $lowerdir/testdir3
make_whiteout $upperdir/{testdir1/foo,/testdir2/foo,testdir3/foo,testdir4/foo}

_overlay_fsck_expect $FSCK_NONDESTRUCT "$lowerdir:$lowerdir2" $upperdir $workdir -p
ls $upperdir/testdir1
ls $upperdir/testdir2
ls $upperdir/testdir3
ls $upperdir/testdir4

# Test orphan whiteout in redirect directory, should remove
echo "+ Orphan whiteout(4)"
make_test_dirs
mkdir $lowerdir/{testdir,origin}
touch $lowerdir/testdir/foo
make_redirect_dir $upperdir/testdir "origin"
make_whiteout $upperdir/testdir/foo

_overlay_fsck_expect $FSCK_NONDESTRUCT $lowerdir $upperdir $workdir -p
ls $upperdir/testdir

# Test valid whiteout in redirect directory cover file in lower
# redirect origin directory, should not remove
echo "+ Valid whiteout(2)"
make_test_dirs
mkdir $lowerdir/origin
touch $lowerdir/origin/foo
make_impure_dir $upperdir
make_redirect_dir $upperdir/testdir "origin"
make_whiteout $upperdir/origin $upperdir/testdir/foo

_overlay_fsck_expect $FSCK_OK $lowerdir $upperdir $workdir -p
check_whiteout $upperdir/testdir/foo

# Test valid whiteout covering lower target whose parent directory
# merge with a redirect directory in the middle layer, should not remove.
echo "+ Valid whiteout(3)"
make_test_dirs
mkdir -p $lowerdir2/origin/subdir
touch $lowerdir2/origin/subdir/foo
make_redirect_dir $lowerdir/testdir "origin"
mkdir -p $upperdir/testdir/subdir
make_whiteout $lowerdir/origin $upperdir/testdir/subdir/foo
make_impure_dir $upperdir/testdir $upperdir

_overlay_fsck_expect $FSCK_OK "$lowerdir:$lowerdir2" $upperdir $workdir -p
check_whiteout $upperdir/testdir/subdir/foo

# Test invalid whiteout in opaque subdirectory in a redirect directory,
# should remove
echo "+ Orphan whiteout(5)"
make_test_dirs
mkdir -p $lowerdir/origin/subdir
touch $lowerdir/origin/subdir/foo
make_redirect_dir $upperdir/testdir "origin"
make_opaque_dir $upperdir/testdir/subdir
make_whiteout $upperdir/testdir/subdir/foo

_overlay_fsck_expect $FSCK_NONDESTRUCT $lowerdir $upperdir $workdir -p
ls $upperdir/testdir/subdir

# Test valid whiteout in reidrect subdirectory in a opaque directory
# covering lower target, should not remove
echo "+ Valid whiteout(4)"
make_test_dirs
mkdir $lowerdir/origin
touch $lowerdir/origin/foo
make_opaque_dir $upperdir/testdir
make_redirect_dir $upperdir/testdir/subdir "/origin"
make_whiteout $upperdir/origin $upperdir/testdir/subdir/foo
make_impure_dir $upperdir/testdir

_overlay_fsck_expect $FSCK_OK $lowerdir $upperdir $workdir -p
check_whiteout $upperdir/testdir/subdir/foo

# success, all done
status=0
exit