#!/bin/bash

TS_TOPDIR="$(dirname $0)/../.."
TS_DESC="wipefs"

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

DEVICE=$(ts_scsi_debug_init dev_size_mb=50 num_parts=2)

# remove old backups
rm -rf $HOME/wipefs-$(basename ${DEVICE})-*.bak

#remove the magic byte, back it up
$TS_CMD_WIPEFS --all --backup ${DEVICE} &>/dev/null || ts_die "wipefs failed"

#there should be just one magic string/backup file in this case
INFILE=$(ls $HOME/wipefs-$(basename ${DEVICE})-*.bak)
OFFT=$(echo $INFILE | sed -E 's/^.*-(.*).bak$/\1/')
dd if=$INFILE of=$DEVICE bs=1 conv=notrunc seek=$(($OFFT)) &>/dev/null

#the bytes should be copied back, check if wipefs can recognize it
$TS_CMD_WIPEFS -a ${DEVICE} > $TS_OUTDIR/out 2>/dev/null

# check for output
[ -s $TS_OUTDIR/out ] && echo "OK" &> $TS_OUTPUT || exit 1

rmmod scsi_debug &>/dev/null
ts_finalize