tests/ts/libmount/loop-overlay

#!/bin/bash

#
# Copyright (C) 2016 Stanislav Brabec <sbrabec@suse.cz>
#
# 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.
#
# This file is distributed in the hope that it will 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.
#
TS_TOPDIR="${0%/*}/../.."
TS_DESC="loop overlay"

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

ts_check_test_command "$TS_CMD_LOSETUP"
ts_check_test_command "$TS_CMD_MOUNT"
ts_check_test_command "$TS_CMD_UMOUNT"

ts_skip_nonroot
ts_check_losetup
ts_check_prog "mkfs.ext3"
ts_check_prog "dd"
ts_check_prog "stat"

IMG=$(ts_image_init 5)

mkfs.ext2 -F "$IMG" &> /dev/null || ts_die "Cannot make extn on $IMG"
OFFSET=$(stat -c %s "$IMG")

dd if="$IMG" of="$IMG" oflag=append bs=1024k count=5 conv=notrunc &>/dev/null

[ -d "$TS_MOUNTPOINT-1" ] || mkdir -p $TS_MOUNTPOINT-1
[ -d "$TS_MOUNTPOINT-2" ] || mkdir -p $TS_MOUNTPOINT-2

echo "second should fail" >>$TS_OUTPUT
$TS_CMD_MOUNT -oloop "$IMG" "$TS_MOUNTPOINT-1" >> $TS_OUTPUT 2>&1
$TS_CMD_MOUNT -oloop,offset=$OFFSET "$IMG" "$TS_MOUNTPOINT-2" 2>&1 \
       | sed 's/:.*:/: <target>/; s/for .*/for <source>/' >> $TS_OUTPUT
$TS_CMD_UMOUNT "$TS_MOUNTPOINT-1" >> $TS_OUTPUT 2>&1

echo "should succeed" >>$TS_OUTPUT
$TS_CMD_MOUNT -oloop,sizelimit=$OFFSET "$IMG" "$TS_MOUNTPOINT-1" >> $TS_OUTPUT 2>&1
$TS_CMD_MOUNT -oloop,offset=$OFFSET "$IMG" "$TS_MOUNTPOINT-2" >> $TS_OUTPUT 2>&1
$TS_CMD_UMOUNT "$TS_MOUNTPOINT-1" >> $TS_OUTPUT 2>&1
$TS_CMD_UMOUNT "$TS_MOUNTPOINT-2" >> $TS_OUTPUT 2>&1

echo "both should fail" >>$TS_OUTPUT
LOOPDEV=$($TS_CMD_LOSETUP --show -f --offset 1 --sizelimit $OFFSET "$IMG")
$TS_CMD_MOUNT -oloop,sizelimit=$OFFSET "$IMG" "$TS_MOUNTPOINT-1" 2>&1 \
	| sed 's/:.*:/: <target>/; s/for .*/for <source>/' >> $TS_OUTPUT
$TS_CMD_MOUNT -oloop,offset=$OFFSET "$IMG" "$TS_MOUNTPOINT-2" 2>&1 \
	| sed 's/:.*:/: <target>/; s/for .*/for <source>/' >> $TS_OUTPUT
$TS_CMD_LOSETUP --detach $LOOPDEV

ts_log "Success"
ts_finalize