#!/bin/bash

CRYPTSETUP="../src/cryptsetup"
DEV=""
DEV_STACKED="luks0xbabe"

cleanup() {
	udevadm settle >/dev/null 2>&1
	[ -b /dev/mapper/$DEV_STACKED ] && dmsetup remove $DEV_STACKED >/dev/null 2>&1
	rmmod scsi_debug 2>/dev/null
	sleep 2
}

fail()
{
	[ -n "$1" ] && echo "$1"
	cleanup
	exit 100
}

add_device() {
	modprobe scsi_debug $@
	if [ $? -ne 0 ] ; then
		echo "This kernel seems to not support proper scsi_debug module, test skipped."
		exit 0
	fi

	sleep 2
	DEV=$(grep scsi_debug /sys/block/*/device/model | cut -f4 -d /)

	if [ ! -e /sys/block/$DEV/alignment_offset ] ; then
		echo "This kernel seems to not support topology info, test skipped."
		cleanup
		exit 0
	fi

	DEV="/dev/$DEV"
	[ -b $DEV ] || fail "Cannot find $DEV."
}


format() # key_bits expected [forced]
{
	if [ -z "$3" ] ; then
		echo -n "Formatting using topology info ($1 bits key)...."
		echo xxx| $CRYPTSETUP luksFormat $DEV -q -i1 -c aes-cbc-essiv:sha256 -s $1
	else
		echo -n "Formatting using forced sector alignment $3 ($1 bits key)..."
		echo xxx| $CRYPTSETUP luksFormat $DEV -q -i1 -s $1 -c aes-cbc-essiv:sha256 --align-payload=$2
	fi

	ALIGN=$($CRYPTSETUP luksDump $DEV |grep "Payload offset" | sed -e s/.*\\t//)
	#echo "ALIGN = $ALIGN"

	if [ -z "$ALIGN" ] ; then
		fail "FAIL"
	elif [ $ALIGN -ne $2 ] ; then
		echo "FAIL"
		fail "Expected alignment differs: expected $2 != detected $ALIGN"
	fi
	echo "PASSED"
}

if [ $(id -u) != 0 ]; then
	echo "WARNING: You must be root to run this test, test skipped."
	exit 0
fi

modprobe --dry-run scsi_debug || exit 0
cleanup

echo "# Create desktop-class 4K drive"
echo "# (logical_block_size=512, physical_block_size=4096, alignment_offset=0)"
add_device dev_size_mb=16 sector_size=512 physblk_exp=3 num_tgts=1
format 256 4096
format 256 2112 8
format 128 2048
format 128 1088 8
format 256 8192 8192
format 128 8192 8192
cleanup

echo "# Create desktop-class 4K drive w/ 63-sector DOS partition compensation"
echo "# (logical_block_size=512, physical_block_size=4096, alignment_offset=3584)"
add_device dev_size_mb=16 sector_size=512 physblk_exp=3 lowest_aligned=7 num_tgts=1
format 256 4103
format 256 2119 8
format 128 2055
format 128 1095 8
cleanup

echo "# Create enterprise-class 4K drive"
echo "# (logical_block_size=4096, physical_block_size=4096, alignment_offset=0)"
add_device dev_size_mb=16 sector_size=4096 num_tgts=1
format 256 4096
format 256 2560 8
format 128 2048
format 128 1536 8
cleanup

echo "# Create classic 512b drive and stack dm-linear"
echo "# (logical_block_size=512, physical_block_size=512, alignment_offset=0)"
add_device dev_size_mb=16 sector_size=512 num_tgts=1
DEV2=$DEV
DEV=/dev/mapper/$DEV_STACKED
dmsetup create $DEV_STACKED --table "0 32768 linear $DEV2 0"
format 256 4096
format 256 2112 8
format 128 2048
format 128 1088 8
format 128 8192 8192
cleanup