tests/generic/378

#! /bin/bash
# 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
#
#-----------------------------------------------------------------------
# Copyright (c) 2016 Red Hat Inc.  All Rights Reserved.
#
# 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 /
	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
_supported_os Linux
_require_test
_require_user

# 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