#!/bin/bash
#
# hooks/partition.WIPEDISKS
#
# author : W. Walkowiak, 2013-01-03
# changed: 
#   changed a number of times over the years by Andrew Ruthven to support
#   newer versions of Debian and handle various issues we've encountered.
#
# Stop LVM an MD RAIDs if existing and wipe all disks with wipefs and dd
#
# $Id: $
#===========================================================================

error=0; trap 'error=$(($?>$error?$?:$error))' ERR # save maximum error code

#--- functions

#----

if [ -f /sbin/mdadm-startall ]
then
  mdadm-startall
else
  mdadm --assemble --scan || true
fi

# Make sure that lvmetad isn't used, otherwise vgchange will
# refuse to run.
sed -i 's/use_lvmetad = 1/use_lvmetad = 0/' /etc/lvm/lvm.conf

# stop volume groups
echo "VGs present:"
vgs 
echo "Stopping the VGs (if present):"
vgchange -an

# stop MD RAID arrays
echo "Stopping and removing MD RAID arrays:"
mdadm --detail --scan 
for array in $(mdadm --detail --scan | cut -d ' ' -f 2 | xargs -n1 --no-run-if-empty readlink -f )
do
  parts=$(mdadm --detail  $array | grep '/dev/' | grep -oE "[^ :]+$")
  mdadm --stop $array
  [ -x $array ] && mdadm --remove $array
  for part in $parts; do
    echo "zeroing $part"
    mdadm --zero-superblock $part
  done 
done
rm -f /etc/mdadm/mdadm.conf

# wipe all disks with wipefs and dd
if [ -n "$disklist" ]; then
  echo "Wiping boot sector of disks: $disklist"
  for disk in $disklist; do
    if echo $disk | grep -q ^md
    then
      echo "Skipping RAID device $disk as we've already removed it"
      continue
    fi
    wipefs -a /dev/$disk
    dd if=/dev/zero of=/dev/$disk bs=512 count=2

    # setup-storage calls parted, and it is upset if there is no disk label.
    echo "Creating disk label on $disk"
    parted /dev/$disk mklabel msdos
  done
fi

exit $error