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/usr/sbin/ocs-restore-mdisks is in clonezilla 3.5.2-2.

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The actual contents of the file can be viewed below.

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#!/bin/bash
# Author: Steven Shiau <steven _at_ nchc org tw>
# License: GPL

# This program is used to restore an image to multiple disks, especially many USB flash drives in a same machine by using Clonezilla live.
# Thanks to T. C. Lin <tclin _at_ mail dfes tpc edu tw> for this idea and testing, and Alvin Su for debuging.

# For more details, please refer to:
# http://drbl.sourceforge.net/faq/fine-print.php?path=./2_System/98_one_image_to_multiple_disks.faq#98_one_image_to_multiple_disks.faq
# and
# http://drbl.sourceforge.net/screenshot/?in_path=/12_Alvin_Su_Taiwan

# ///WARNING/// This program is really dangerous! You have to know what you are doing! Especially the destination disks!

# Load functions and config file
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

# Settings
batch_mode="false"
# Option to separate fdisk action. See function separate_fdisk_in_another_step_first for more details.
separate_fdisk="false"

#
USAGE() {
    echo "$prog - To restore an image to multiple disks"
    echo "Usage:"
    echo "$prog [OPTION] IMAGE_NAME DEV"
    echo "IMAGE_NAME  The image name, i.e. the image dir in $ocsroot/"
    echo "DEV         The destination device name, e.g. sdc, sdd, sde..."
    echo "OPTION:"
    echo "-b, --batch-mode            Run in batch mode"
    echo "-p, --ocs-sr-param PARAM    Assign the parameters to be used in ocs-sr program."
    echo "-s, --separate-fdisk        Separate the fdisk action from the main program of restoring, i.e. run fdisk first for all the actions."
    echo "-um, --user-mode [beginner|expert]      Specify the mode to use."
    echo "Ex:"
    echo "To restore the image \"usb-image\" to 3 USB flash drives sda, sdb, and sdc, you can run:"
    echo "  $prog usb-image sda sdb sdc"
    echo "To restore the image \"usb-image\" to 3 USB flash drives sda, sdb, and sdc in batch mode with the options "-g auto -e1 auto -e2 -c -r -j2 -p true" for ocs-sr, you can run:"
    echo "  $prog -b -p "-g auto -e1 auto -e2 -c -r -j2 -p true" usb-image sda sdb"
} # end of USAGE
#
separate_fdisk_in_another_step_first() {
  # If -k option of ocs-sr is chosen, skip repartition. Otherwise, do it.
  if [ -z "$(LC_ALL=C echo $OCS_OPTS | grep -Ew -- "-k")" ]; then
    # Create partition table first. If we do not do this first, sfdisk will wait for the lock file to be released, so the 2nd clone won't start in any case.
    gen_proc_partitions_map_file
    for i in $tgt_dsks; do
      if [ -z "$(grep -Ew "$i" $partition_table)" ]; then
        [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
        echo "Disk /dev/$i not found. Skip restoring it."
        [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
        continue
      fi
      tgt_hd_file="/dev/$i"
      tgt_dir="$ocsroot/${image_name}_cnvt_${i}"
      if [ -n "$(grep -iE "^Partition Table:" $tgt_dir/${i}-pt.parted 2>/dev/null | grep -iE "gpt")" ]; then
        pt_type="gpt"
      else
        pt_type="mbr"
      fi
      echo "Creating the partition table for $i..."
      case "$pt_type" in
      mbr)
        # If the partition table is tag as "gpt", change it as msdos
        if [ -n "$(LC_ALL=C parted -s $tgt_hd_file print | grep -iE "^Partition Table:" | grep -iE "gpt")" ]; then
          echo "The partition table in $tgt_hd_file is for GPT, now make it for MBR."
          LC_ALL=C parted -s $tgt_hd_file mklabel msdos
        fi
        sfdisk --force $tgt_hd_file < $tgt_dir/${i}-pt.sf
        inform_kernel_partition_table_changed mbr $tgt_hd_file
        ;;
      gpt)
        clean_mbr_partition_table_before_gen_gpt_table $tgt_hd_file
        create_gpt_table_if_no_table $tgt_hd_file
        echo "Running: sgdisk -l $tgt_dir/${i}-gpt.gdisk $tgt_hd_file"
        LC_ALL=C sgdisk -l $tgt_dir/${i}-gpt.gdisk $tgt_hd_file
        sgdisk_rc=$?
        if [ "$sgdisk_rc" -ne 0 ]; then
          [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
          echo "Failed to create partition table on $i."
          [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
        fi
        echo "Informing kernel that the OS that partition table has changed..."
        inform_kernel_partition_table_changed gpt $tgt_hd_file
        ;;
      esac
    done
  fi
  
  # Reset option -k* as -k since repartition has been done in the previous step.
  if [ -z "$(LC_ALL=C echo $OCS_OPTS | grep -Ew -- "-k[[:digit:]]+")" ]; then
    # -k* does not exist, append it.
    OCS_OPTS="$OCS_OPTS -k"
  else
    # -k* exists
    OCS_OPTS="$(echo $OCS_OPTS | sed -r -e "s/-k[[:digit:]]+/-k/g")"
  fi
  [ -f "$partition_table" ] && rm -f $partition_table
} # end of separate_fdisk_in_another_step_first

####################
### Main Program ###
####################
prog="$(basename $0)"

# Parse command-line options
while [ $# -gt 0 ]; do
  case "$1" in
    -b|--batch) batch_mode="true"; shift;;
    -s|--separate-fdisk) separate_fdisk="true"; shift;;
    -p|--ocs-sr-param)
            shift
            # Here we accept the -xx option, since they are used by ocs-sr
	    # E.g. "-g auto -e1 auto -e2 -c -r -j2 -p true"
	    # will be run as: ocs-sr -g auto -e1 auto -e2 -c -r -j2 -p true...
            OCS_OPTS="$1"
            shift
            [ -z "$OCS_OPTS" ] && USAGE && exit 1
	    ;;
    -um|--user-mode)
            shift
            # skip the -xx option, in case 
            if [ -z "$(echo $1 |grep ^-.)" ]; then
              ocs_user_mode="$1"
              shift
            fi
            [ -z "$ocs_user_mode" ] && USAGE && exit 1
	    ;;
    -*)     echo "${0}: ${1}: invalid option" >&2
            USAGE >& 2
            exit 2 ;;
    *)      break ;;
  esac
done
#
image_name="$1"
shift
tgt_dsks=$*

check_if_root
ask_and_load_lang_set
# check DIA
check_DIA_set_ESC $DIA
#
[ -z "$image_name" ] && image_name="ask_user"
[ -z "$tgt_dsks" ] && tgt_dsks="ask_user"

#
if [ "$batch_mode" = "false" ]; then
  echo $msg_delimiter_star_line
  [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
  echo "$msg_prompt_for_insert_USB_dev_as_destination_disks"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo -n "$msg_press_enter_to_continue..."
  read
  echo $msg_delimiter_star_line
fi

# If OCS_OPTS is assigned, no need to ask ocs_user_mode.
if [ -z "$OCS_OPTS" ]; then
  [ -z "$ocs_user_mode" ] && ask_if_beginner_or_expert_mode
fi

run_again_flag="false"
if [ "$image_name" = "ask_user" ]; then
  imagedir="$ocsroot"
  ocs_mode_prompt="1-2-mdisks"
  get_target_dir_name_when_restoring_disk  # get $target_dir
  image_name="$target_dir"
  run_again_flag="true"
fi
if [ "$tgt_dsks" = "ask_user" ]; then
  # To get $target_hd
  ocs_mode_prompt="1-2-mdisks"
  get_target_hd_name_from_local_machine "$msg_choose_the_disks_to_restore \n$msg_linux_disk_naming $msg_press_space_to_mark_selection" checklist
  tgt_dsks="$target_hd"
  run_again_flag="true"
fi

#
# Check inupt values
# 1. image name
check_input_target_image "$ocsroot/$image_name"
# 2. destination disks
check_input_hd $tgt_dsks

if [ -z "$OCS_OPTS" ]; then
  # Get the ocs-sr parameters
  # ocs_mode_prompt is to be shown in the title of dialog menu later
  ocs_sr_type="restoredisk"
  ocs_mode_prompt="1-2-mdisks"
  # ask if want to set ocs extra param
  OCS_PARAM_TMP=`mktemp /tmp/ocs_sr_param_tmp.XXXXXX`
  trap "[ -f "$OCS_PARAM_TMP" ] && rm -f $OCS_PARAM_TMP" HUP INT QUIT TERM EXIT
  set_ocs_sr_extra_param restore $OCS_PARAM_TMP $ocs_sr_type
  # In interactive mode, we reset OCS_OPTS instead of appending it. Later wrap_up_opt will process more.
  OCS_OPTS="$(cat $OCS_PARAM_TMP)"
  OCS_OPTS="$(echo $OCS_OPTS)"  # make it in a line
  [ -f "$OCS_PARAM_TMP" ] && rm -f $OCS_PARAM_TMP
  run_again_flag="true"
fi

# Run again prompt
if [ "$run_again_flag" = "true" ]; then
  run_again_fname="/tmp/ocs-mdisk-`date +%F-%H-%M`"
  run_again_bfname="/tmp/ocs-mdisk-batch-`date +%F-%H-%M`"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_SUCCESS
  echo "PS. $msg_run_drbl_ocs_again_cmd"
  echo "$prog -p \"$OCS_OPTS\" $image_name $tgt_dsks" | tee $run_again_fname
  echo "$msg_ocs_sr_again_command_saved_filename: $run_again_fname"
  echo "$msg_if_you_want_to_run_in_unattended_mode"
  echo "$prog -b -p \"$OCS_OPTS\" $image_name $tgt_dsks" | tee $run_again_bfname
  echo "$msg_ocs_sr_again_command_saved_filename: $run_again_bfname"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  [ -e "$run_again_fname" ] && chmod 755 $run_again_fname
  [ -e "$run_again_bfname" ] && chmod 755 $run_again_bfname
fi

# Give warnings. 
echo $msg_delimiter_star_line
if [ "$batch_mode" = "false" ]; then
  get_dev_model_shown "$tgt_dsks" 
  confirm_before_clone="yes"
  countdown_or_confirm_before_restore "$ocsroot/$image_name" "$tgt_dsks"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
  echo "$msg_let_me_ask_you_again."
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  countdown_or_confirm_before_restore "$ocsroot/$image_name" "$tgt_dsks"
fi

# Calculate the disk number
disk_no="$(LC_ALL=C echo $tgt_dsks | wc -w)"

# Find the original disk
src_disk="$(LC_ALL=C cat $ocsroot/$image_name/disk)"
src_disk_no="$(LC_ALL=C echo $src_disk | wc -w)"
if [ "$src_disk_no" -ne 1 ]; then
  [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  echo "$msg_source_disks_more_than_1"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo "$msg_program_stop"
  exit 1
fi

# Prepare the temp images, we put them in the /tmp otherwise if the original repository might be readonly or FAT (no support for soft link).
# From now on we switch the image repository to /tmp/.
ocsroot="/tmp"
for i in $tgt_dsks; do
  create-ocs-tmp-img -t $ocsroot $image_name ${image_name}_cnvt_${i} $src_disk ${i}
done

if [ "$separate_fdisk" = "true" ]; then
  separate_fdisk_in_another_step_first
fi

# Remove -c so it can be in batch mode.
if [ -n "$(LC_ALL=C echo $OCS_OPTS | grep -Ew -- "-c")" ]; then
  OCS_OPTS="$(echo $OCS_OPTS | sed -r -e "s/-c//g")"
fi
# Append -b option to run them in batch mode.
if [ -z "$(LC_ALL=C echo $OCS_OPTS | grep -Ew -- "-b")" ]; then
  OCS_OPTS="$OCS_OPTS -b"
fi
# Append -nogui option to run them in plain text mode.
if [ -z "$(LC_ALL=C echo $OCS_OPTS | grep -Ew -- "-nogui")" ]; then
  OCS_OPTS="$OCS_OPTS -nogui"
fi
gen_proc_partitions_map_file
for i in $tgt_dsks; do
  # Clean the stale file
  rm -f /tmp/${image_name}_cnvt_${i}.log
  [ -z "$(grep -Ew "$i" $partition_table)" ] && continue
  echo "Restoring image for disk $i..."
  # use -k to skip sfdisk since we have done that in the previous step.
  #ocs-sr -g auto -nogui -b -k -e1 auto -e2 -r -j2 -p true restoredisk "${image_name}_cnvt_${i}" "$i" &
  ocs-sr --ocsroot $ocsroot $OCS_OPTS restoredisk "${image_name}_cnvt_${i}" "$i" 2>&1 | tee /tmp/${image_name}_cnvt_${i}.log &
done
[ -f "$partition_table" ] && rm -f $partition_table

# wait for all processes to finish before exit
wait