/usr/sbin/ocs-live-pre-run is in clonezilla 3.5.2-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | #!/bin/bash
DRBL_SCRIPT_PATH="${DRBL_SCRIPT_PATH:-/usr/share/drbl}"
. $DRBL_SCRIPT_PATH/sbin/drbl-conf-functions
. /etc/drbl/drbl-ocs.conf
. $DRBL_SCRIPT_PATH/sbin/ocs-functions
#
cmdl_file="/proc/cmdline"
ocs_prerun_list="$(grep -Ewo "ocs_prerun[[:digit:]]*" $cmdl_file | uniq | sort -n)"
ocs_prerun_list="$(echo $ocs_prerun_list)"  # in one line
if [ -z "$ocs_prerun_list" ]; then
  exit 0
else
  echo "Found ocs_prerun* parameter in boot parameters..."
  echo "The order to run: $ocs_prerun_list"
fi
parse_cmdline_option -c $cmdl_file "echo_ocs_prerun"
for i in $ocs_prerun_list; do
  parse_cmdline_option -c $cmdl_file "$i"
  eval irun=\$$i
  if [ -n "$irun" ]; then
    echo "**************************"
    # run it
    if [ "$echo_ocs_prerun" != "no" ]; then
      echo "Now run \"$i\": $irun..."
    fi
    # Since "$irun" might not be exe mode, so we test it if it's script, use . $irun, else, run it directly.
    if [ "$(LANG=C file -Ls $irun 2>/dev/null | grep -iE "shell script")" ]; then
      . $irun
    else
      $irun
    fi
  fi
done
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