#!/bin/bash

#
# Copyright (C) 2022 Karel Zak <kzak@redhat.com>
#
# This file is part of util-linux.
#
# This file 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; either version 2 of the License, or
# (at your option) any later version.
#
TS_TOPDIR="${0%/*}/../.."
TS_DESC="complex"

. $TS_TOPDIR/functions.sh
ts_init "$*"

ts_skip_nonroot
ts_skip_qemu_user

ts_check_test_command "$TS_CMD_MOUNT"
ts_check_losetup

$TS_CMD_MOUNT --version | grep -q 'fd-based' || ts_skip "no fd-based API"

ts_device_init
DEVICE=$TS_LODEV

mkfs.ext2 $DEVICE &> /dev/null || ts_die "Cannot make ext2 on $DEVICE"
ts_udevadm_settle "$DEVICE"

ROOT_MOUNTPOINT="$TS_MOUNTPOINT"
A_MOUNTPOINT="${ROOT_MOUNTPOINT}/A"
B_MOUNTPOINT="${ROOT_MOUNTPOINT}/B"

[ -d "$ROOT_MOUNTPOINT" ] || mkdir -p $ROOT_MOUNTPOINT
[ -d "$A_MOUNTPOINT" ] || mkdir -p $A_MOUNTPOINT
[ -d "$B_MOUNTPOINT" ] || mkdir -p $B_MOUNTPOINT

## create a private directory
ts_init_subtest "init"
$TS_CMD_MOUNT --bind --make-private $ROOT_MOUNTPOINT $ROOT_MOUNTPOINT  >> $TS_OUTPUT 2>> $TS_ERRLOG
$TS_CMD_FINDMNT -nr --mountpoint $ROOT_MOUNTPOINT -o PROPAGATION | grep -q private \
	|| ts_log "Cannot find private $ROOT_MOUNTPOINT"
ts_finalize_subtest


## mount the device 
ts_init_subtest "rw-mount"
$TS_CMD_MOUNT -orw $DEVICE $A_MOUNTPOINT >> $TS_OUTPUT 2>> $TS_ERRLOG
ts_is_mounted $DEVICE || ts_log "Cannot find $DEVICE in /proc/mounts"
ts_finalize_subtest


## move device and set it read-only for VFS (FS is still rw)
ts_init_subtest "ro-move"
$TS_CMD_MOUNT --move -o ro $A_MOUNTPOINT $B_MOUNTPOINT >> $TS_OUTPUT 2>> $TS_ERRLOG
findmnt -nr -o VFS-OPTIONS --mountpoint $B_MOUNTPOINT | grep -q 'ro' \
	|| ts_log "Cannot find ro VFS"
findmnt -nr -o FS-OPTIONS --mountpoint $B_MOUNTPOINT | grep -q 'rw' \
	|| ts_log "Cannot find rw FS"
ts_finalize_subtest


## remount to set FS to read-only (VFS is still ro)
ts_init_subtest "ro-remount"
$TS_CMD_MOUNT -oremount,ro,noexec $B_MOUNTPOINT >> $TS_OUTPUT 2>> $TS_ERRLOG
findmnt -nr -o VFS-OPTIONS --mountpoint $B_MOUNTPOINT | grep -q 'ro' \
	|| ts_log "Cannot find ro VFS"
findmnt -nr -o FS-OPTIONS --mountpoint $B_MOUNTPOINT | grep -q 'ro' \
	|| ts_log "Cannot find ro FS"
ts_finalize_subtest


## remount to set FS and VFS to read-write
ts_init_subtest "rw-remount"
$TS_CMD_MOUNT -oremount,rw $B_MOUNTPOINT >> $TS_OUTPUT 2>> $TS_ERRLOG
findmnt -nr -o VFS-OPTIONS --mountpoint $B_MOUNTPOINT | grep -q 'rw' \
	|| ts_log "Cannot find rw VFS"
findmnt -nr -o FS-OPTIONS --mountpoint $B_MOUNTPOINT | grep -q 'rw' \
	|| ts_log "Cannot find rw FS"
ts_finalize_subtest


## bind as read-only (VFS), set shared propagation,
## and remove noexec (but keep FS rw)
ts_init_subtest "ro-shared-bind"
$TS_CMD_MOUNT --make-shared --bind -oro,exec $B_MOUNTPOINT $A_MOUNTPOINT >> $TS_OUTPUT 2>> $TS_ERRLOG
findmnt -nr -o VFS-OPTIONS --mountpoint $A_MOUNTPOINT | grep -q 'ro' \
	|| ts_log "Cannot find ro VFS"
findmnt -nr -o FS-OPTIONS --mountpoint $A_MOUNTPOINT | grep -q 'rw' \
	|| ts_log "Cannot find rw FS"
findmnt -nr -o PROPAGATION --mountpoint $A_MOUNTPOINT | grep -q 'shared' \
	|| ts_log "Cannot find shared flag"
findmnt -nr -o  VFS-OPTIONS --mountpoint $A_MOUNTPOINT | grep -q 'noexec' \
	&& ts_log "Found noexec flag"
ts_finalize_subtest


## cleanup
$TS_CMD_UMOUNT $A_MOUNTPOINT &> /dev/null
$TS_CMD_UMOUNT $B_MOUNTPOINT &> /dev/null
$TS_CMD_UMOUNT $ROOT_MOUNTPOINT &> /dev/null

ts_finalize