#!/bin/bash
#!/bin/bash
# License: GPL 
# Author: Steven Shiau <steven _at_ clonezilla org>
# Reinstall executable code area (first 446 bytes in EBR)
# Ref: https://en.wikipedia.org/wiki/Extended_boot_record
# Extended boot record (EBR) is the 512-byte boot sector:
# 446 bytes (executable code area) + 64 bytes (table of primary partitions) + 2 bytes (EBR signature; # 0xAA55) = 512 bytes.
# EBRs have essentially the same structure as the MBR.
#
DRBL_SCRIPT_PATH="${DRBL_SCRIPT_PATH:-/usr/share/drbl}"
. $DRBL_SCRIPT_PATH/sbin/drbl-conf-functions
. /etc/drbl/drbl-ocs.conf
. $DRBL_SCRIPT_PATH/sbin/ocs-functions

# Load the config in ocs-live.conf. This is specially for Clonezilla live. It will overwrite some settings of /etc/drbl/drbl-ocs.conf, such as $DIA...
[ -e "/etc/ocs/ocs-live.conf" ] && . /etc/ocs/ocs-live.conf

#
USAGE() {
    echo "$ocs - To restore the EBR (Extended boot record) from an image to device"
    echo "Usage:"
    echo "To run $ocs:"
    echo "$ocs [OPTION] IMAGE_NAME DEVICE"
    echo "Options:"
    echo "-or, --ocsroot DIR  Specify DIR (absolute path) as directory ocsroot (i.e. overwrite the ocsroot assigned in drbl.conf)"
    echo "IMAGE_NAME is the image dir name, not absolute path"
    echo "DEVICE is the device name, e.g. sda1, sda2..."
    echo "Ex:"
    echo "To restore the the EBR saved in the image \"my-image\" to device sda4, run:"
    echo "   $ocs my-image sda4"
    echo
} # end of USAGE


####################
### Main program ###
####################

ocs_file="$0"
ocs=`basename $ocs_file`
#
#
while [ $# -gt 0 ]; do
 case "$1" in
   -or|--ocsroot)
           # overwrite the ocsroot in drbl.conf
           shift; 
           if [ -z "$(echo $1 |grep ^-.)" ]; then
             # skip the -xx option, in case 
             ocsroot="$1"
             shift;
           fi
           [ -z "$ocsroot" ] && USAGE && exit 1
           ;;
   -*)     echo "${0}: ${1}: invalid option" >&2
           USAGE >& 2
           exit 2 ;;
   *)      break ;;
 esac
done

target_dir="$1"
shift
target_part="$*"

# Fedora Core 1 seems to use dumb for rc1, we have to force it use linux.
# otherwise setterm will complain.
[ -z "$TERM" -o "$TERM" = "dumb" ] && TERM="linux"
echo "Setting the TERM as $TERM"
export TERM="$TERM"

#
check_if_root
ask_and_load_lang_set

if [ -z "$target_dir" ]; then
  [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  echo "No image was assigned!"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  USAGE
  echo "$msg_program_stop!"
  exit 1
fi
if [ -z "$target_part" ]; then
  [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  echo "No destination partition was assigned!"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  USAGE
  echo "$msg_program_stop!"
  exit 1
fi

#
target_dir_fullpath="$ocsroot/$target_dir"

for ipart in $target_part; do
  # 1st, check if this partition on a MBR disk, not GPT one.
  dsk_pt="$target_dir_fullpath/$(to_filename $(get_diskname ${ipart}))-pt.parted"
  if ! `is_mbr_partitition_table_file $dsk_pt`; then
    echo "Partition $ipart is not on MBR disk. Maybe it's on GPT one. No need to restore the EBR data."
    continue
  fi
  # 2nd, check if $ipart is extended partition 
  # For cciss partition, e.g. /dev/cciss/c0d0p2 will be "p2" which is got from $(get_part_number /dev/cciss/c0d0p2)", here the part_index we want is only number, hence we need to trip the leading characters.
  index="$(LC_ALL=C get_part_number $ipart | sed -r -e "s|^[^[:digit:]]*||g")"  # index is like 2
  part_type="$(LC_ALL=C grep -Ew "^[[:space:]]*$index" ${dsk_pt} | grep -iw "extended")"
  if [ -z "$part_type" ]; then
    # Not extended partition
    echo "Partition $ipart is not extended partition. No need to restore the EBR data."
    continue
  fi 

  #
  echo -n "Restoring the first 446 bytes of EBR data for extended partition $ipart... "
  dd if=$target_dir_fullpath/$(to_filename ${ipart})-ebr of=/dev/$ipart bs=446 count=1 &>/dev/null
  echo "done."
  echo $msg_delimiter_star_line
done