tests/generic/317

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2013 Oracle, Inc.  All Rights Reserved.
#
# FS QA Test No. 317
#
# Check uid/gid to/from disk with a user namespace. A new file
# will be created from inside a userns. We check that the uid/gid
# is correct from both inside the userns and also from init_user_ns.
# We will then unmount and remount the file system and check the
# uid/gid from both inside the userns and from init_user_ns to show
# that the correct uid was flushed and brought back from disk.
#
. ./common/preamble
_begin_fstest auto metadata quick

# Override the default cleanup function.
_cleanup()
{
    cd /
    _scratch_unmount >/dev/null 2>&1
}

# Import common functions.
. ./common/filter
. ./common/attr

file=$SCRATCH_MNT/file1

# real QA test starts here
_supported_fs generic
# only Linux supports user namespace

[ -x $lstat64 ] || _notrun "$lstat64 executable not found"

_require_scratch
_require_user
_require_ugid_map
_require_userns
_require_chown
qa_user_id=`id -u $qa_user`

_filter_output()
{
    sed \
      -e "s/$qa_user_id/qa_user/g" \
      -e "s!$SCRATCH_MNT!\$SCRATCH_MNT!"
}

_print_numeric_uid()
{
    echo "From init_user_ns"
    $here/src/lstat64 $file |head -3 |_filter_output

    echo "From user_ns"
    # don't use $here/src/lstat64, as we're running cmd(src/lstat64) in
    # nsexec as a regular user, and $here may contain path component that
    # a regular user doesn't have search permission
    $here/src/nsexec -s -U -M "0 $qa_user_id 1000" -G "0 $qa_user_id 1000" src/lstat64 $file |head -3 |_filter_output
}

_scratch_unmount >/dev/null 2>&1
echo "*** MKFS ***" >>$seqres.full
echo ""             >>$seqres.full
_scratch_mkfs       >>$seqres.full 2>&1 || _fail "mkfs failed"
_scratch_mount
chmod 777 $SCRATCH_MNT

# create $file as "root" in userns, which is $qa_user in parent namespace
$here/src/nsexec -s -U -M "0 $qa_user_id 1000" -G "0 $qa_user_id 1000" touch $file

_print_numeric_uid

echo ""
echo "*** Remounting ***"
echo ""
sync
_scratch_cycle_mount      >>$seqres.full 2>&1 || _fail "remount failed"

_print_numeric_uid

_scratch_unmount >/dev/null 2>&1
status=0
exit