#!/bin/bash

TS_TOPDIR="${0%/*}/../.."
TS_DESC="wipefs"

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

ts_check_test_command "$TS_CMD_WIPEFS"

ts_skip_nonroot

# set global variable TS_DEVICE
ts_scsi_debug_init dev_size_mb=50 num_parts=2

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

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

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

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

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

ts_finalize