tests/generic/378

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Red Hat Inc.  All Rights Reserved.
#
# FS QA Test 378
#
# Simple permission check on hard links.
#
# Overlayfs had a bug that hardlinks don't share inode, if chmod/chown/etc.
# is performed on one of the links then the inode belonging to the other
# one won't be updated. The following patch fixed this issue
#
# 51f7e52 ovl: share inode for hard link
#
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
_supported_fs generic
_require_test
_require_user
_require_hardlinks

# Setup testfile and its hardlink
testfile=$TEST_DIR/testfile.$seq
testlink=$testfile.hardlink
rm -f $testfile $testlink
echo "You should not see this" >$testfile
ln $testfile $testlink

# remove read permission from testfile and unprivileged user should have no
# permission to read testfile and hardlink
chmod -r $testfile
_user_do "cat $testfile"
_user_do "cat $testlink"

# success, all done
status=0
exit