File: drbl-functions

package info (click to toggle)
drbl 5.8.2-1
links: PTS, VCS
area: main
in suites: forky, sid
size: 6,996 kB
sloc: sh: 43,555; perl: 8,820; xml: 867; makefile: 135
file content (5331 lines) | stat: -rwxr-xr-x 224,880 bytes
#!/bin/bash
# -*-Shell-script-*-
# Steven Shiau <steven _at_ clonezilla org>
# Ceasar Sun <ceasar dot sun _at_ gmail com>
# License: GPL
#
# Functions:	This file contains functions to be used by most or all	shell scripts in the DRBL environment
#
# //NOTE// Do NOT set the locale by "export LC_ALL=C". It will make dialog distortation.

# Source DRBL setting
DRBL_SCRIPT_PATH="${DRBL_SCRIPT_PATH:-/usr/share/drbl}"
. /etc/drbl/drbl.conf

# Append a default search path.
# To make it like: 
# PATH="$PATH:$DRBL_SCRIPT_PATH/sbin:$DRBL_SCRIPT_PATH/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin"
path_to_add="$DRBL_SCRIPT_PATH/sbin $DRBL_SCRIPT_PATH/bin /usr/sbin /usr/bin /sbin"
for i in $path_to_add; do
  if [ -z "$(echo $PATH | grep -Fw $i)" ]; then
    PATH="$PATH:$i"
  fi
done
export PATH

# setup some parameters for color output. The variables should be already 
# defined in the /etc/init.d/functions in RH-like distribution 

# Check if terminal supports colors output
colors_no="$(LC_ALL=C tput colors 2>/dev/null)"

BOOTUP=""
if [ -n "$colors_no" ]; then
  if [ "$colors_no" -ge 8 ]; then
    [ -z "$SETCOLOR_SUCCESS" ] && SETCOLOR_SUCCESS="echo -en \\033[1;32m"
    [ -z "$SETCOLOR_FAILURE" ] && SETCOLOR_FAILURE="echo -en \\033[1;31m"
    [ -z "$SETCOLOR_WARNING" ] && SETCOLOR_WARNING="echo -en \\033[1;33m"
    [ -z "$SETCOLOR_NORMAL"  ] && SETCOLOR_NORMAL="echo -en \\033[0;39m"
    BOOTUP="color"
  fi
fi

# some functions
# get OS type
get_os_type() {
  case "$OS_Version" in
     RH*|FC*|CO*)
        OS_type="RH"
        ;;
     MD[KV]*)
        OS_type="MDK"
        ;;
     DBN*)
        OS_type="DBN"
        ;;
     SUSE*)
        OS_type="SUSE"
        ;;
     *)
        echo "This version in this distribution is NOT supported by DRBL, maybe you can try to use the drbl in testing or unstable repository. Program terminated!"
        exit 1 
  esac
} # end of get OS type

#
check_distribution_name() {
  local VER
  local DIST
  local FULL_DIST
  # Reset these values
  OS_Version=
  FULL_OS_Version=
  # FULL_OS_Version is only used in the label
  # like the files /tftpboot/nbi_img/pxelinux.cfg/* (default or 0A....).
  # OS_Version is used in drblsrv and drblpush to judge the dist and version.
  if [ -f /etc/fedora-release ]; then
   VER=$(rpm -qf /etc/fedora-release --qf "%{VERSION}" | sed "s/[^0-9\.]//g")
   DIST=FC
   FULL_DIST=Fedora
  elif [ -f /etc/mandriva-release ]; then
   VER=$(rpm -qf /etc/mandriva-release --qf "%{VERSION}" | sed "s/[^0-9\.]//g")
   DIST=MDV
   FULL_DIST=Mandriva
  elif [ -f /etc/mandrake-release ]; then
   # /etc/mandrake-release must be after the /etc/mandriva-release, since the
   # new Mandriva distributions has /etc/mandrake-release, too.
   VER=$(rpm -qf /etc/mandrake-release --qf "%{VERSION}" | sed "s/[^0-9\.]//g")
   if [ "$VER" = "10.2" ]; then
     # Exception:
     # "Mandrakelinux release 10.2.*" /etc/mandrakelinux-release
     # OS_Version="MDV2005"
     DIST=MDV
     FULL_DIST=Mandriva
     VER=2005
   else
     DIST=MDK
     FULL_DIST=Mandrake
   fi
  elif [ -e /etc/SuSE-release ]; then
   VER=$(rpm -qf /etc/SuSE-release --qf "%{VERSION}" | sed "s/[^0-9\.]//g")
   DIST=SUSE
   FULL_DIST=SuSE
  elif [ -f /etc/redhat-release ]; then
   # /etc/redhat-release must be the last "elif" for RH-like dist, since there
   # are so many distributions are based on RH, and do exist /etc/redhat-release
   if grep -q -i "CentOS" /etc/redhat-release; then
     # The release of CentOS is a little difference, we can not use
     # rpm -qf /etc/redhat-release --qf "%{VERSION}" to get the version, since
     # we will get "4", but actually it's "4.2" or "4.1"
     VER=$(cat /etc/redhat-release | sed "s/[^0-9\.]//g")
     DIST=CO
     FULL_DIST=CentOS
   elif grep -q -i "Scientific Linux" /etc/redhat-release; then
     # Scientific Linux
     # To simplify that, we only support drblsrv-offline for Scientific Linux
     # The DIST is set as CO for compatibility.
     VER=$(cat /etc/redhat-release | sed "s/[^0-9\.]//g")
     DIST=CO
     FULL_DIST=SL
   elif grep -q -i "OSSII" /etc/redhat-release; then
     # The release of OSSII M6 Linux is like:
     # OSSII M6 Linux
     # To simplify that, we only support drblsrv-offline for OSSII
     # The DIST is set as CO for compatibility, basically it's useless here.
     VER=$(grep -Eo "M[[:digit:]]" /etc/redhat-release)
     DIST=CO
     FULL_DIST=OSSII
   else
     # The last one... RedHat
     # In some case, no idea why, when run this as root in RH9, it will crash
     # [root]# rpm -qf --qf '%{VERSION}' /etc/redhat-release
     # Segmentation fault
     # So we do not use this:
     #VER=$(rpm -qf /etc/redhat-release --qf "%{VERSION}" | sed "s/[^0-9\.]//g")
     # We use this:
     VER=$(cat /etc/redhat-release | sed "s/[^0-9\.]//g")
     DIST=RH
     FULL_DIST=RedHat
   fi
  elif [ -f /etc/debian_version ]; then
   DIST=DBN
   FULL_DIST=Debian
   # get the version
   if grep -qE "(testing/unstable|sid)" /etc/debian_version; then
     VER="-TU"
     # Here we assign a better tag for FULL_OS_Version
     FULL_OS_Version="Debian Testing-Unstable"
   else
     VER="$(cat /etc/debian_version)"
   fi
   # Overwrite the FULL_OS_Version if others are found. Especially for Ubuntu
   if [ -e /etc/lsb-release ]; then
     . /etc/lsb-release
     FULL_OS_Version="$DISTRIB_ID $DISTRIB_RELEASE"
   fi
  fi

  if [ -z "$DIST" -o -z "$VER" ]; then
    echo "The distribution or version is unknown! Program terminated!"
    exit 1
  fi
  # If not assigned, assign it
  [ -z "$OS_Version" ] && OS_Version="${DIST}${VER}"
  [ -z "$OS_DIST" ] && OS_DIST="${DIST}"
  [ -z "$FULL_OS_Version" ] && FULL_OS_Version="${FULL_DIST} ${VER}"

  # get the OS_type variable
  get_os_type
  #
  # echo $OS_Version
} # end of check_distribution_name

# create the shared library program runtime env.
# ldd might give these 3 type results:
# 1. newer version (FC3):
# ldd /sbin/depmod
#         libc.so.6 => /lib/libc.so.6 (0x00a08000)
#         /lib/ld-linux.so.2 (0x009f1000)
# 2. older version (RH8/9,FC1/2):
# ldd /sbin/depmod
#         libc.so.6 => /lib/libc.so.6 (0x40025000)
#         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
# 3. MDK10
#         linux-gate.so.1 =>  (0xffffe000)
#         libc.so.6 => /lib/tls/libc.so.6 (0x40028000)
#         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
#RH9:
#libc.so.6 => /lib/libc.so.6 (0x40025000)
#/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
#FC1:
#libc.so.6 => /lib/libc.so.6 (0x00a35000)
#/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x00a20000)
#FC2:
#libc.so.6 => /lib/libc.so.6 (0x00b76000)
#linux.so.2 => /lib/ld-linux.so.2 (0x00b61000)
#FC3:
#libc.so.6 => /lib/tls/i686/libc.so.6 (0x007b3000)
#linux.so.2 (0x0079c000)
#mdk10:
#linux-gate.so.1 =>  (0xffffe000)
#libc.so.6 => /lib/tls/libc.so.6 (0x40028000)
#/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
 
create_depmod_env() {
  # This function is useless from drbl 1.7.6-23 or later, since we use 
  # depmod -b baseroot/ instead of chroot.
  # However, we still keep this for ref.
  local newroot="$1"
  [ -z "$newroot" ] && exit 1
  # some distribution, like Mandriva, use link in /sbin/depmod, so we clean it
  # to avoid some error.
  [ -e "$newroot/sbin/depmod" ] && rm -f $newroot/sbin/depmod
  # -L: always follow symbolic links
  cp -L --parents /sbin/depmod* $newroot
  export DESTDIR="$newroot"
  if ldd /sbin/depmod &>/dev/null; then
    depmod_lib_need=$(LC_ALL=C ldd /sbin/depmod | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')
    for imod in $depmod_lib_need; do
      # Skip linux-vdso.so.1 and linux-gate.so.1, the virtual DSO, a shared object exposed by the kernel. They do not exist on the file system. Ref: http://ilivetoseek.wordpress.com/2011/10/24/linux-gate-so-1-or-linux-vdso-so-1/ 
      [ "$imod" = "linux-vdso.so.1" ] && continue
      [ "$imod" = "linux-gate.so.1" ] && continue
      #cp --parents -d $imod $newroot
      copy_exec_drbl $imod "$(LC_ALL=C dirname $imod)"
    done
  fi
}
clean_depmod_env() {
  # This function is useless from drbl 1.7.6-23 or later, since we use 
  # depmod -b baseroot/ instead of chroot.
  # However, we still keep this for ref.
  local newroot="$1"
  [ -z "$newroot" ] && exit 1
  [ -f $newroot/sbin/depmod ] && rm -f $newroot/sbin/depmod
  # for MDK 9.2, there is another depmod.old...
  [ -f $newroot/sbin/depmod.old ] && rm -f $newroot/sbin/depmod.old
  if ldd /sbin/depmod &>/dev/null; then
    depmod_lib_need=$(LC_ALL=C ldd /sbin/depmod | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')
    for f2rm in $depmod_lib_need; do
      [ -f "$newroot/$f2rm" ] && rm -f $newroot/$f2rm
    done
  fi
}

# function to create chkconfig environment
create_chkconfig_env() {
  local newroot="$1"
  [ -z "$newroot" ] && exit 1
  cp --parents /sbin/chkconfig $newroot
  export DESTDIR="$newroot"
  if ldd /sbin/chkconfig &>/dev/null; then
    chkconfig_lib_need=$(LC_ALL=C ldd /sbin/chkconfig | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')
    for imod in $chkconfig_lib_need; do
      # Skip linux-vdso.so.1 and linux-gate.so.1, the virtual DSO, a shared object exposed by the kernel. They do not exist on the file system. Ref: http://ilivetoseek.wordpress.com/2011/10/24/linux-gate-so-1-or-linux-vdso-so-1/ 
      [ "$imod" = "linux-vdso.so.1" ] && continue
      [ "$imod" = "linux-gate.so.1" ] && continue
      #cp --parents -d $imod $newroot
      copy_exec_drbl $imod "$(LC_ALL=C dirname $imod)"
    done
  fi
}

# function to clean chkconfig environment
clean_chkconfig_env() {
  local newroot="$1"
  [ -z "$newroot" ] && exit 1
  chkconfig_lib_need=$(LC_ALL=C ldd /sbin/chkconfig | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')
  [ -f $newroot/sbin/chkconfig ] && rm -f $newroot/sbin/chkconfig
  for f2rm in $chkconfig_lib_need; do
    [ -f $newroot/$f2rm ] && rm -f $newroot/$f2rm
  done
}

# function to create insserv environment
create_insserv_env() {
  local newroot="$1"
  [ -z "$newroot" ] && exit 1
  cp --parents -d /sbin/insserv $newroot
  export DESTDIR="$newroot"
  if ldd /sbin/insserv &>/dev/null; then
    insserv_lib_need=$(LC_ALL=C ldd /sbin/insserv | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')
    for imod in $insserv_lib_need; do
      # Skip linux-vdso.so.1 and linux-gate.so.1, the virtual DSO, a shared object exposed by the kernel. They do not exist on the file system. Ref: http://ilivetoseek.wordpress.com/2011/10/24/linux-gate-so-1-or-linux-vdso-so-1/ 
      [ "$imod" = "linux-vdso.so.1" ] && continue
      [ "$imod" = "linux-gate.so.1" ] && continue
      #cp --parents -d $imod $newroot
      copy_exec_drbl $imod "$(LC_ALL=C dirname $imod)"
    done
  fi
}
# Check if root or not
check_if_root() {
   if [ ! "$UID" = "0" ]; then
     echo
     echo "[$LOGNAME] You need to run this script \"`basename $0`\" as root."
     echo
     exit 1
   fi
}

# function to get the autologin_account
# input is the host dir, like /tftpboot/nodes/192.168.1.1, then
# return the auto_login ID
get_autologin_account() {
    local ihost="$1"
    local ip HOSTNAME
    # $auto_login_id and $echo_no_digit_0_1 are global variables
    # auto login username is set as hostname, i.e. use client's hostname as the auto-login ID.
    # Reset variable auto_login_id
    auto_login_id=""
    if [ -e /etc/debian_version ]; then
      # Debian
      auto_login_id="$(cat $ihost/etc/hostname 2>/dev/null)"
    elif [ -e /etc/SuSE-release ]; then
      # SuSE
      auto_login_id="$(cat $ihost/etc/HOSTNAME 2>/dev/null | sed -e "s/\..*//g")"
    else
      # RH-like
      if [ -e $ihost/$SYSCONF_PATH/network ]; then
        HOSTNAME=""
        . $ihost/$SYSCONF_PATH/network
        auto_login_id="$HOSTNAME"
      fi
    fi
    # if no hostname, such as in DRBL SSI mode, try to map the hostname from $IP_HOST_TABLE
    if [ -z "$auto_login_id" ]; then
      ip="$(basename $ihost)"
      auto_login_id="$(awk -F" " "/^$ip[[:space:]]+/ {print \$2}" $IP_HOST_TABLE)"
    fi

    # Added by Ceasar:
    # auto-login account can be defined via: /etc/drbl/auto_login_host_id_passwd.txt
    # Read /etc/drbl/auto_login_host_id_passwd.example as sample
    auto_login_host_id_passwd_file="/etc/drbl/auto_login_host_id_passwd.txt"
    _tmp_auto_login_id="$(LC_ALL=C awk  -v auto_login_id="$auto_login_id" '{if ($1 == auto_login_id ) {print $2}}' $auto_login_host_id_passwd_file 2>/dev/null )"
    _tmp_auto_login_passwd="$(LC_ALL=C awk -v auto_login_id="$auto_login_id"  '{if ($1 == auto_login_id ) {print $3}}' $auto_login_host_id_passwd_file 2>/dev/null )"

    if [ -n "$_tmp_auto_login_id" ] ; then
      auto_login_id="$_tmp_auto_login_id"
      password_opt="$_tmp_auto_login_passwd"
    fi 
}
# only show existing autologin account
get_existing_autologin_account() {
    local ihost="$1"
    get_autologin_account $ihost
    if grep -q $auto_login_id /etc/passwd ; then
      # account $auto_login_id exists, show it
      echo "$auto_login_id"
    fi
}

# check switch if it is input correct as on or off
check_switch_on_off() {
  local switch="$1"
  case "$switch" in
    on|ON|[oO]|[nN]|off|OFF|[oO][fF][fF])
         true;;
     "")
         usage && exit 1
         ;;
     *)
         echo "You must specify \"on\" or \"off\" !!! Program stop!!!"
         exit 1
         ;;
  esac
}

#
create_authconfig_env() {
  local newroot="$1"
  [ -z "$newroot" ] && exit 1
   file_need="/usr/sbin/authconfig /usr/sbin/pwconv /usr/sbin/grpconv"
   cp --parents $file_need $newroot

   if ldd /usr/sbin/authconfig &>/dev/null; then
     authconfig_lib_need=$(LC_ALL=C ldd /usr/sbin/authconfig | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')
     for imod in $authconfig_lib_need; do
       # Skip linux-vdso.so.1 and linux-gate.so.1, the virtual DSO, a shared object exposed by the kernel. They do not exist on the file system. Ref: http://ilivetoseek.wordpress.com/2011/10/24/linux-gate-so-1-or-linux-vdso-so-1/ 
       [ "$imod" = "linux-vdso.so.1" ] && continue
       [ "$imod" = "linux-gate.so.1" ] && continue
       cp --parents -d $imod $newroot
     done
   fi
   if ldd /usr/sbin/pwconf &>/dev/null; then
     pwconf_lib_need=$(LC_ALL=C ldd /usr/sbin/pwconf | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')
     for imod in $pwconf_lib_need; do
       # Skip linux-vdso.so.1 and linux-gate.so.1, the virtual DSO, a shared object exposed by the kernel. They do not exist on the file system. Ref: http://ilivetoseek.wordpress.com/2011/10/24/linux-gate-so-1-or-linux-vdso-so-1/ 
       [ "$imod" = "linux-vdso.so.1" ] && continue
       [ "$imod" = "linux-gate.so.1" ] && continue
       cp --parents -d $imod $newroot
     done
   fi
   if ldd /usr/sbin/grpconv &>/dev/null; then
     grpconv_lib_need=$(LC_ALL=C ldd /usr/sbin/grpconv | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')
     for imod in $grpconv_lib_need; do
       # Skip linux-vdso.so.1 and linux-gate.so.1, the virtual DSO, a shared object exposed by the kernel. They do not exist on the file system. Ref: http://ilivetoseek.wordpress.com/2011/10/24/linux-gate-so-1-or-linux-vdso-so-1/ 
       [ "$imod" = "linux-vdso.so.1" ] && continue
       [ "$imod" = "linux-gate.so.1" ] && continue
       cp --parents -d $imod $newroot
     done
   fi
}

#
create_chpasswd_env() {
  local newroot="$1"
  [ -z "$newroot" ] && exit 1
  # These *.so were found by using strace
  # If something goes wrong in newer GNU/Linux distribution, we can find more by:
  # (1) uncomment this line in this function:
  #     # cp --parents /usr/bin/strace $newroot
  # (2) in drbl-client-root-passwd, make it run
  #     echo "root:$new_passwd" | /usr/bin/strace /usr/sbin/chpasswd
  #     instead of "echo "root:$new_passwd" | /usr/sbin/chpasswd"
  #     Then by running drbl-client-root-passwd we can see which lib*.so* is missing.
  # //NOTE// /lib* includes /lib and /lib64
  PAM_need_files="/lib*/security/ /usr/lib*/libcrack*.so* /usr/lib*/cracklib_dict.* /lib*/libnss_files*.so* /lib/*/libnss_files*.so* /usr/lib/*/libnss_files*.so* /lib*/libnsl*.so* /lib/*/libnss_nis*.so* /usr/lib/*/libnss_nis*.so*  /usr/lib/pwdutils/*.so* /lib*/libcrypt*.so* /usr/lib*/libcrypto*.so* /lib/xcrypt/libxcrypt*.so* /lib/*/security/*pam*.so* /lib/security/*pam*.so* /lib/*/libnsl*.so*  /lib/*/tls/i686/sse2/cmov/libnsl*.so* /lib/*/tls/cmov/libnsl*.so* /usr/lib/*/tls/i686/sse2/cmov/libnsl*.so* /usr/lib/*/tls/cmov/libnsl*.so* /lib/tls/*/libnsl*.so* /lib/tls/sse2/cmov/libnsl*.so* /lib/tls/cmov/libnsl*.so* /lib/*/libdbus*.so* /lib/*/tls/libdbus*.so*  /usr/lib/*/i686/libnsl*.so* /usr/lib*/libdbus*.so* /usr/lib/cmov/libdbus*.so* /lib/*/libcap*.so* /lib/libcap*.so* /usr/lib/libcap*.so* /lib/libck-connector*.so* /lib/*/libck-connector*.so* /usr/lib/libck-connector*.so* /lib/*/librt*.so* /usr/lib/*/librt*.so* /lib/*/libcgmanager*.so* /lib/*/libnih*.so* /lib/*/*pam*.so* /lib/*/libpthread*.so*"
  chpasswd_lib_need="$(LC_ALL=C ldd /usr/sbin/chpasswd | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')"
  echo_lib_need="$(LC_ALL=C ldd /bin/echo | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')"
  export DESTDIR="$newroot"
  for imod in $chpasswd_lib_need $echo_lib_need; do
    # Skip linux-vdso.so.1 and linux-gate.so.1, the virtual DSO, a shared object exposed by the kernel. They do not exist on the file system. Ref: http://ilivetoseek.wordpress.com/2011/10/24/linux-gate-so-1-or-linux-vdso-so-1/ 
    [ "$imod" = "linux-vdso.so.1" ] && continue
    [ "$imod" = "linux-gate.so.1" ] && continue
    #cp --parents -d $imod $newroot
    copy_exec_drbl $imod "$(LC_ALL=C dirname $imod)"
  done
  # /bin/echo is necessary for chpasswd
  cp --parents -d /bin/echo $newroot
  cp --parents -d /usr/sbin/chpasswd $newroot
  # cp --parents /usr/bin/strace $newroot

  #cp --parents -r $PAM_need_files $newroot
  for ipam in $PAM_need_files; do
    [ -n "$(ls $ipam 2>/dev/null)" ] && cp --parents -r $ipam $newroot
  done
  # we need sh to run the script, borrow it from mkpxeinitrd-net's busybox
  cp /usr/lib/mkpxeinitrd-net/initrd-skel/bin/sh $newroot/bin
} # end of create_chpasswd_env

#
#create_passwd_env() {
#  local newroot="$1"
#  [ -z $newroot ] && exit 1
#  # /lib* includes /lib and /lib64
#  PAM_need_files="/lib*/security/ /usr/lib*/libcrack*.so* /usr/lib*/cracklib_dict.* /lib*/libnss_files*.so* /lib*/libnsl*.so* /usr/lib/pwdutils/*.so*"
#  passwd_lib_need=$(ldd /usr/bin/passwd | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')
#  for imod in $passwd_lib_need; do
#    cp --parents $imod $newroot
#  done
#  cp --parents /usr/bin/passwd $newroot
#
#  # /bin/echo is necessary for passwd --stdin
#  cp --parents /bin/echo $newroot
#
#  cp --parents -r $PAM_need_files $newroot
#  # we need sh to run the script, borrow it from mkpxeinitrd-net's busybox
#  cp /usr/lib/mkpxeinitrd-net/initrd-skel/bin/sh $newroot/bin
#}

clean_passwd_env() {
  local newroot="$1"
  [ -z "$newroot" ] && exit 1
#  passwd_lib_need=$(ldd /usr/bin/passwd | cut -d" " -f3)
#  [ -f "$newroot/usr/bin/passwd" ] && rm -f $newroot/usr/bin/passwd
#  [ -f "$newroot/bin/echo" ] && rm -f $newroot/bin/echo
#  for f2rm in $passwd_lib_need; do
#    [ -f $newroot/$f2rm ] && rm -f $newroot/$f2rm
#  done
#  for f2rm in $PAM_need_files; do
#    [ -f $newroot/$f2rm ] && rm -f $newroot/$f2rm
#  done
#  [ -f "$newroot/bin/sh" ] && rm -f $newroot/bin/sh
  for d2rm in bin lib usr; do
    if [ -d "$newroot/$d2rm" ]; then
      [ -n "$verbose" ] && echo "Cleaning the unnecessary directory $newroot/$d2rm ..."
      rm -rf $newroot/$d2rm
    fi
  done
} # end of clean_passwd_env
#
clean_chpasswd_env() {
  local newroot="$1"
  [ -z "$newroot" ] && exit 1
  for d2rm in bin lib usr; do
    if [ -d "$newroot/$d2rm" ]; then
      [ -n "$verbose" ] && echo "Cleaning the unnecessary directory $newroot/$d2rm ..."
      rm -rf $newroot/$d2rm
    fi
  done
} # end of clean_chpasswd_env

# check if the user input /dev/hda, /dev/hdb...
check_input_hd() {
    local target_hd="$1"
    case "$target_hd" in
	 [hsv]d[a-z])
	   continue
	   ;;
	 *)
	  echo "Unknown HD device! Program stop!"
          Usage
	  exit 1
    esac
}

## description:
##   convert devfs names into normal short ones, written by Tom Rini.
fixdevfs() {
    ## get partition number, if any
    local PARTNUM="${1##*[a-z]}"
    ## Find the bus type.
    local TYPE="$(v=${1#/dev/} ; echo ${v%/host*})"
    ## Find the host number.
    local HOST="$(v=${1#/dev/*/host} ; echo ${v%/bus*})"
    ## Find the bus number.
    local BUS="$(v=${1#/dev/*/bus} ; echo ${v%/tar*})"
    ## Find the target.
    local TARGET="$(v=${1#/dev/*/target} ; echo ${v%/lun*})"

    case "$TYPE" in
	ide)
	case "$HOST" in
	    0)
	    case "$TARGET" in
		0)
		local DEV=hda
		;;
		1)
		local DEV=hdb
		;;
	    esac
	    ;;
	    1)
	    case "$TARGET" in
		0)
	        local DEV=hdc
	        ;;
		1)
		local DEV=hdd
		;;
	    esac
	    ;;
	    2)
	    case "$TARGET" in
		0)
	        local DEV=hde
	        ;;
		1)
		local DEV=hdf
		;;
	    esac
	    ;;
	    3)
	    case "$TARGET" in
		0)
	        local DEV=hdg
	        ;;
		1)
		local DEV=hdh
		;;
	    esac
	    ;;
	    *)
		echo "${1#/dev/}"
		#echo "Unable to translate this device, try again without devfs."
		return 1
	esac
	local DEV="${DEV}${PARTNUM}"
	echo "$DEV"
	return 0
	;;
	scsi)
	local LUN="$(v=${1#/dev/*/lun} ; echo ${v%/*})"

	## In this case, we need to figure out what number our device is
	local DEVCOUNT=0

	## copy scsi file into a variable removing "Attached Devices"
	## which is the first line. this avoids a lot of
	## [incmopatible] crap later, and improves readability.

	## find number of lines once and recycle that number, to save
	## some time (linecount is a bit slow). subtract one line
	## to scrap Attached Devices:

	local SCSILINES="$(($(wc -l /proc/scsi/scsi | cut -d' ' -f1) - 1))"
	local PROCSCSI="$(cat /proc/scsi/scsi | tail -n $SCSILINES)"

	for i in $(seq $(($SCSILINES / 3))) ; do

	    ## put every scsi device into one single line
	    local DEVINFO="$(echo "$PROCSCSI" | head -n $(($i * 3)) | tail -n 3)"
	    [ "$DEBUG" = 1 ] && echo 1>&2 "$PRG: DEBUG: fixdevfs: DEVINFO=$DEVINFO"

	    ## cut the type field, expect "Direct-Access" later.
	    local DEVTYPE="$(v=$(echo ${DEVINFO##*Type: }) ; echo ${v%% *})"
	    [ "$DEBUG" = 1 ] && echo 1>&2 "$PRG: DEBUG: fixdevfs: DEVTYPE=$DEVTYPE"

	    if [ "$DEVTYPE" = "Direct-Access" ] ; then
		## Lets find out some more information
		## get the device id.
		local DEVID="$(v=$(echo ${DEVINFO##*Id: }) ; n=$(echo ${v%% *}) ; echo ${n#*0})"
		[ "$DEBUG" = 1 ] && echo 1>&2 "$PRG: DEBUG: fixdevfs: DEVID=$DEVID"

		## get the device lun.
		local DEVLUN="$(v=$(echo ${DEVINFO##*Lun: }) ; n=$(echo ${v%% *}) ; echo ${n#*0})"
		[ "$DEBUG" = 1 ] && echo 1>&2 "$PRG: DEBUG: fixdevfs: DEVLUN=$DEVLUN"

		## get the device channel.
		local DEVCHAN="$(v=$(echo ${DEVINFO##*Channel: }) ; n=$(echo ${v%% *}) ; echo ${n#*0})"
		[ "$DEBUG" = 1 ] && echo 1>&2 "$PRG: DEBUG: fixdevfs: DEVCHAN=$DEVCHAN"

		## get the scsi host id.
		local DEVHOST="$(v=$(echo ${DEVINFO##*Host: scsi}) ; echo ${v%% *})"
		[ "$DEBUG" = 1 ] && echo 1>&2 "$PRG: DEBUG: fixdevfs: DEVHOST=$DEVHOST"

		local DEVCOUNT="$(($DEVCOUNT + 1))"
		[ "$DEBUG" = 1 ] && echo 1>&2 "$PRG: DEBUG: fixdevfs: DEVCOUNT=$DEVCOUNT"
		if [ "$DEVHOST" = "$HOST" -a "$DEVCHAN" = "$BUS" -a \
		    "$DEVID" = "$TARGET" -a "$DEVLUN" = "$LUN" ] ; then
		    local DEV="sd$(smalltr $DEVCOUNT)${PARTNUM}"
		    echo "$DEV"
		    return 0
		fi
	    fi
	done
	echo "${1#/dev/}"
	#echo "Unable to translate this device, try again without devfs."
	return 1
	;;
	*)
	echo "${1#/dev/}"
	#echo "Unknown bus"
	return 1
	;;
    esac
    ## we should never get here
    return 1
}

# get dhcpd interface
get_dhcpd_interface() {
  local INTERFACES INTERFACESv4 INTERFACES_TMP
  if [ -e /etc/debian_version ]; then
    # Debian
    . $SYSCONF_PATH/$DHCP_SRV_NAME
  elif [ -e /etc/SuSE-release ]; then
    # SuSE
    . $SYSCONF_PATH/$DHCP_SRV_NAME
    INTERFACES="$DHCPD_INTERFACE"
  else
    # RH-like
    # The content of /etc/sysconfig/dhcpd file:
    # E.g. DHCPDARGS="-p 67 eth0 eth1";
    # //NOTE// Although /etc/sysconfig/dhcpd is not used anymore by CentOS/Fedora which uses systemd, we still can use it as the config file for dhcpd, because it's easier for us to parse compared with dhcpd.conf.
    # Det the setting of dhcp server
    . $SYSCONF_PATH/$DHCP_SRV_NAME
    # collect those interface, filter out other options, such as -p 60
    INTERFACES=""
    for ieth in $DHCPDARGS; do
       # For CentOS >= 7, NIC device name is changed as "Predictable Network Interface Names".
       # Ref: http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/
       # Names incorporating Firmware/BIOS provided index numbers for on-board devices (example: eno1)
       # Names incorporating Firmware/BIOS provided PCI Express hotplug slot index numbers (example: ens1)
       # Names incorporating physical/geographical location of the connector of the hardware (example: enp2s0)
       # Names incorporating the interfaces's MAC address (example: enx78e7d1ea46da)
       # Classic, unpredictable kernel-native ethX naming (example: eth0)
       INTERFACES_TMP="$(echo $ieth | grep -Eo '(eth[[:digit:]]+|en[[:print:]]+|p[[:digit:]]+p[[:digit:]]+)')"
       INTERFACES="$INTERFACES $INTERFACES_TMP"
    done
  fi
  # The variable might be INTERFACES or INTERFACESv4 (newer isc-dhcp-server)
  echo $INTERFACES $INTERFACESv4
} # end of get_dhcpd_interface

# HD dma status
check_hd_dma() {
   # input example: /dev/hda
   # return 0/1, 0: DMA off, 1: DMA on
   local hd_dev=$1
   DMA_status=$(hdparm -d $hd_dev 2>/dev/null | grep using_dma | awk  '{print $3}')
   echo "$DMA_status"
}

# turn on hd dma
turn_on_hd_dma() {
    local hd_dev="$1"
    if [ -z "$hd_dev" ]; then
      echo "To turn on HD dma, you have to specify the HD dev!"
      exit 1
    fi
    # Only IDE (/dev/hda) need to be turned on DMA.
    [ -z "$(echo $hd_dev | grep -F "/dev/hd")" ] && return 3
    #
    echo "*******************************************"
    echo "Try to turn on the harddisk \"$hd_dev\" DMA..."
    if [ "$(check_hd_dma $hd_dev)" = "0" ]; then
      # turn on DMA if it's off (0)
      hdparm -d1m1c1 $hd_dev
    fi
    # check the result
    DMA="$(check_hd_dma $hd_dev)"
    if [ -n "$DMA" ]; then
       # This is IDE device, we can get DMA status
       [ "$DMA" -eq 0 ] && echo "Warning!!! Failed to turn on harddisk \"$hd_dev\" DMA... The clone performance might be NOT good..." && sleep 5
    else
       # This is SCSI device, we can not get DMA status
       echo "No HD DMA information, maybe this not a IDE device!"
    fi
    echo "*******************************************"
} # end of turn_on_hd_dma

# do not let screen be blank
#
screen_not_blank() {
  if [ "$ocs_screen_blank" != "no" ]; then
    setterm --blank 0 --powersave off 2>/dev/null
  fi
}

# set passwd login for single user mode
set_clients_rc1_passwd() {
  local rc1_sulogin="~~:S:wait:/sbin/sulogin"
  IP_LIST=$*
  # make a flag "LIST_HOST"
  [ -n "$IP_LIST" ] && LIST_HOST="on"

  for ihost in $drblroot/*; do
     # skip those IP not listed in the $IP_LIST
     if [ "$LIST_HOST" = "on" ]; then
       [ -z "$(echo $IP_LIST | grep ${ihost##/*/})" ] && continue
     fi

    if ! grep -qE ^$rc1_sulogin $ihost/etc/inittab 2>/dev/null; then
      echo "Set the single user password for client ${ihost##/*/}, this will be safer..."
      cat <<-EOF >> $ihost/etc/inittab

# Single User Mode Password, added by DRBL
$rc1_sulogin
EOF
    fi
  done
}
#
get_lang_index() {
   local lang=$1
   local language
   case "$lang" in
      "2")
           language="zh_TW.UTF-8"
           ;;
       *)
           language="en_US.UTF-8"
           ;;
   esac
   echo $language
}

check_kernel_nfsd_tcp_config() {
  # note the kernel should be the one is using in the drbl server
  kernel_ver=$(uname -r)
  # check if /boot/config-$kernel_ver exists
  # kernel config is either in /boot/ 
  kernel_config="/boot/config-$kernel_ver"
  echo "Checking server kernel config \"$kernel_config...\""
  if [ ! -f $kernel_config ]; then 
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "$kernel_config does NOT exist!"
    echo "I can not judge whether NFS over TCP is supported in the kernel you are using!!!"
    echo "We will assume that the NFS server use UDP protocol!"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    protocol="udp"
  else
    # we assume the the priority is higher for EXT2, i.e. EXT2 option will overwrite the CRAMFS.
    if [ -n "$(grep "^CONFIG_NFSD_TCP=y" $kernel_config)" ]; then
      protocol="tcp"
    else
      [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
      echo "$kernel_config is found but NFS over TCP is not supported in the kernel you are using for the DRBL clients!!!"
      echo "We will use NFS over UDP !"
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
      protocol="udp"
    fi
  fi
  case "$protocol" in
    [tT][cC][pP])
       rc=0 
       ;;
    [uU][dD][pP])
       rc=1 
       ;;
  esac
  return $rc
}

switch_clients_init() {
   # input: client_init IP_LIST
   # if IP_LIST is none, this function will process all the clients.
   local CLIENT_INIT
   local IP_LIST
   CLIENT_INIT=$1
   shift
   IP_LIST=$*
   # make a flag "LIST_HOST"
   [ -n "$IP_LIST" ] && LIST_HOST="on"
   [ -z "$CLIENT_INIT" ] && echo "No specified mode for client inittab!!! Program stop!!!" && exit 1
   for host in $drblroot/*; do
     # skip those IP not listed in the $IP_LIST
     if [ "$LIST_HOST" = "on" ]; then
       [ -z "$(echo $IP_LIST | grep ${host##/*/})" ] && continue
     fi

     echo "Setting the graphic mode for node IP = $(basename $host)..."
     # set the init to 5, i.e. default is X
     /usr/bin/perl -p -i -e "s/^id:[1-5]:initdefault:/id:$CLIENT_INIT:initdefault:/g" $host/etc/inittab
   done
}

# This "GREP_NEWER" program is borrowed from http://staff.washington.edu/corey/new-patches.cgi
# The original author:
# Corey Satten, corey @ cac.washington.edu, 06/26/03, release 1.8
# For the latest version visit: http://staff.washington.edu/corey/tools.html
#
# Modified by Blake Huang and Steven Shiau to use in DRBL
GREP_NEWER='
    # Function newer:
    # Return 1 if second arg is "newer" than the first arg, else return 0.
    #
    # Because extra dotted fields before a hyphen are more significant
    # than those after a hyphen, first split on hyphens, then loop over
    # dotted fields passing the hard alphanumerics to function "compare"
    # for further splitting and comparing.
    #
    # eg.  older bind-utils-8.2.2_P5-9     and  older gzip-1.2.4-14
    #      newer bind-utils-8.2.2_P7-0.6.2 and  newer gzip-1.2.4a-2
    #
    #      older apmd-3.0beta9-3           and  older rmt-0.4b4-11 
    #      newer apmd-3.0final-2           and  newer rmt-0.4b19-5.6x

    function newer(a, b,    na1, nb1, na, nb, minn, i, j) {
	#printf("newer called with %s %s\n", a, b)
	if ('"${EFLAG-0}"') return a!=b
	if (O) {na=a; a=b; b=na}
	na1 = split(a, A1, /-/)
	nb1 = split(b, B1, /-/)
	if (na1 != nb1) {
	  #printf "unsure about %s and %s\n", a, b > "/dev/stderr"
	  return 1 }
	for (j=1; j<=na1; ++j) {
	  na = split(A1[j], A, /\./)
	  nb = split(B1[j], B, /\./)
	  minn = na < nb ? na : nb
	  for (i=1; i<=minn; ++i) {
	    if ('"${DEBUG-0}"') \
	      printf(" newer%d comparing %s %s\n", i, A[i], B[i])>"/dev/stderr"
	    if ((A[i] B[i]) ~ /^[0-9]+$/) {
	      if (A[i]+0 < B[i]+0) return 1
	      if (A[i]+0 > B[i]+0) return 0 }
	    else if (A[i] "" != B[i] "") return compare(A[i], B[i])
	    }
	  if (nb > na) return 1
	  if (nb < na) return 0
	  }
	return 0
	}

    # Function compare (called only by function newer):
    # Return 1 if second arg is "newer" than the first arg, else return 0.
    #
    # This is harder than it looks: consider "v9" vs "v10a", etc.
    # split out and compare alternating fields of numeric and non-numeric

    function compare (a, b,    xa, xb) {
	#printf(" compare called with %s %s\n", a, b)
	while (length(a) && length(b)) {
	  if (a ~ /^[0-9]/) {
	    match(a, /^[0-9]+/)
	    xa = substr(a, 1, RLENGTH); a = substr(a, RLENGTH+1) }
	  else {
	    match(a, /^[^0-9]+/)
	    xa = substr(a, 1, RLENGTH); a = substr(a, RLENGTH+1) }
	  if (b ~ /^[0-9]/) {
	    match(b, /^[0-9]+/)
	    xb = substr(b, 1, RLENGTH); b = substr(b, RLENGTH+1) }
	  else {
	    match(b, /^[^0-9]+/)
	    xb = substr(b, 1, RLENGTH); b = substr(b, RLENGTH+1) }
	    #printf("  compare2 %s %s <%s> <%s>\n", xa, xb, a, b)
	  if ( (xa xb) ~ /^[0-9]+$/) {
	    if (xa+0 < xb+0) return 1
	    if (xa+0 > xb+0) return 0 }
	  else {
	    if (xa "" < xb "") return 1
	    if (xa "" > xb "") return 0 }
	  }
	if (length(b)) return 1
	else return 0
	}
    '
#
set_specific_host_pxe_conf() {
  local HOSTS="$*"
  local pxecfg pxecfg_MAC pxecfg_MIP OCS_TMP IP
  # prepare the HOSTNAME-IP-MAC table
  OCS_TMP=`mktemp /tmp/ocs_clean_tmp.XXXXXX`
  trap "[ -f "$OCS_TMP" ] && rm -f $OCS_TMP" HUP INT QUIT TERM EXIT
  parse_dhcpd_conf $OCS_TMP

  for ih in $HOSTS; do
    case "$ih" in
      *.*.*.*)
        # list by IP
	# the pxecfg will like "C0A80001"
	pxecfg="$(drbl-gethostip $ih)"
        # These files look like: 01-MAC address (with ":" -> "-"),
	# We'd better to clean the 01-MAC file if it exists since maybe it's created by ocsmgrd when received the results from client in the previous save/restoration. Since 01-MAC has higher priority than "C0A80001" style file in pxelinux, this is a must if we can find it, we have to remove it.
	# TODO: What if no MAC address setting in dhcpd.conf ? Then $OCS_TMP will be empty, then... ?
        pxecfg_MAC="01-$(grep ${ih} $OCS_TMP | awk -F" " '{print $3}' | tr ":" "-")"
        [ -f "$PXELINUX_DIR/$pxecfg_MAC" ] && rm -f $PXELINUX_DIR/$pxecfg_MAC
        ;;
      *:*:*:*:*:*)
        # list by MAC
	# for an Ethernet (ARP type 1) with address 88:99:AA:BB:CC:DD it would search for the filename 01-88-99-aa-bb-cc-dd (lowercase)
	pxecfg="$(echo $ih | tr "[A-Z]" "[a-z]" | tr ":" "-")"
	# append "01-" in the beginning
	pxecfg="01-$pxecfg"
	# We'd better to clean the IP-based setting file if it exists since maybe it's created by ocsmgrd when received the results from client in the previous save/restoration. Although 01-MAC has higher priority than "C0A80001" style file in pxelinux, this NOT a must if we can find it, but we remove it to avoid confusion.
        IP="$(grep -E ${ih} $OCS_TMP | awk -F" " '{print $2}')"
	pxecfg_MIP="$(drbl-gethostip $IP)"
        [ -f "$PXELINUX_DIR/$pxecfg_MIP" ] && rm -f $PXELINUX_DIR/$pxecfg_MIP
        ;;
    esac
    echo -n "Generate the PXE config file for host $ih ... "
    cp -f $PXELINUX_DIR/default_skeleton $PXELINUX_DIR/$pxecfg
    echo "done!"
  done
  [ -f "$OCS_TMP" ] && rm -f $OCS_TMP
} # end of set_specific_host_pxe_conf

# function to get the pxecfg image block line number
get_pxecfg_image_block() {
     local IMG_NAME="$1"
     local PXE_CONF_TMP="$2"
     [ -z "$IMG_NAME" ] && exit 1
     # By using
     # grep -Ei -n '^[[:space:]]*label[[:space:]]+.*([[:space:]]|$)+' /tftpboot/nbi_img/pxelinux.cfg/default | grep -A1 -E "label[[:space:]]+drbl([[:space:]]|$)+"
     # 10:label drbl
     # 17:label local
     # so we know we can replace the one between line no. 10 and 17
     between_lines="$(LC_ALL=C grep -Ei -n "^[[:space:]]*label[[:space:]]+.*([[:space:]]|$)+" $PXE_CONF_TMP | grep -Ei -A1 "label[[:space:]]+$IMG_NAME([[:space:]]|$)+" | cut -d":" -f1)"
     begin_line="$(LC_ALL=C echo $between_lines | awk -F" " '{print $1}')"
     end_line="$(LC_ALL=C echo $between_lines | awk -F" " '{print $2}')"
     # if end_line is nothing, it must be the last block, i.e. we can not find the next [.*]
     if [ -z "$end_line" ]; then
       end_line="$(LC_ALL=C wc -l $PXE_CONF_TMP | awk -F" " '{print $1}')"
     else
       # if not nothing, backword one line
       end_line="$(($end_line - 1))"
     fi
     echo "$begin_line $end_line"
} # end of get_pxecfg_image_block
check_img_in_pxe_cfg() {
     local IMG="$1"
     local PXE_CONF_TMP="$2"
     if [ -z "$IMG" ]; then
        [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
        echo "You must specify the image name! Program terminated!!!"
        [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
        exit 1
     fi
     if ! grep -Eiq "^[[:space:]]*label[[:space:]]+$IMG" $PXE_CONF_TMP; then
        [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
        echo "Unable to find the image ($IMG) label! Make sure the $IMG is labeled in $PXE_CONF_TMP! Program terminated!!!"
        [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
        exit 1
     fi
} # end of check_img_in_pxe_cfg
sub_default_pxe_img() {
     local IMG="$1"
     local PXE_CONF_TMP="$2"
     local MENU_LABEL="$3"
     check_img_in_pxe_cfg $IMG $PXE_CONF_TMP
     # turn off all MENU DEFAULT
     echo "Turn off all MENU DEFAULT in $PXE_CONF_TMP... "
     perl -pi -e "s/^(#|[[:space:]])*MENU DEFAULT.*/  # MENU DEFAULT/i" $PXE_CONF_TMP
     all_label="$(awk '/^[[:space:]]*label[[:space:]]+.*([[:space:]]|$)+/ {print $2}' $PXE_CONF_TMP)"
     # 2006/09/10 Steven commented this, we'd better keep the way pxelinux config is.
     #for i in $all_label; do
     #  if [ -z "$(echo $IMG_SHOW_IN_MENU | grep -i $i)" ]; then
     #    [ -n "$VERBOSE" ] && echo "Hide image $i"
     #    hide_reveal_pxe_img $i hide $PXE_CONF_TMP
     #  fi
     #done

     # turn on MENU DEFAULT & turn off MENU HIDE for the specified image
     lines="$(get_pxecfg_image_block $IMG $PXE_CONF_TMP)"
     begin_line="$(echo $lines | awk -F" " '{print $1}')"
     end_line="$(echo $lines | awk -F" " '{print $2}')"
     echo "Make \"$IMG\" as default label in $PXE_CONF_TMP."
     sub_def_cmd="if ($begin_line..$end_line) {s/^(#|[[:space:]])*MENU DEFAULT.*/  MENU DEFAULT/i}"
     sub_hide_cmd="if ($begin_line..$end_line) {s/^(#|[[:space:]])*MENU HIDE.*/  # MENU HIDE/i}"
     perl -pi -e "$sub_def_cmd" $PXE_CONF_TMP
     perl -pi -e "$sub_hide_cmd" $PXE_CONF_TMP

     if [ -n "$MENU_LABEL" ]; then
       echo The MENU LABEL is \"$MENU_LABEL\"
       sub_menu_label_cmd="if ($begin_line..$end_line) {s|^[[:space:]]*MENU LABEL.*|  MENU LABEL $MENU_LABEL|i}"
       perl -pi -e "$sub_menu_label_cmd" $PXE_CONF_TMP
     fi
} # end of sub_default_pxe_img
# use script hide_reveal_pxe_img instead of fnction.
#hide_reveal_pxe_img() {
#     local IMG="$1"
#     local ACT="$2"
#     local PXE_CONF_TMP="$3"
#     check_img_in_pxe_cfg $IMG $PXE_CONF_TMP
#     # turn off MENU DEFAULT & turn on MENU HIDE for the specified image
#     lines=$(get_pxecfg_image_block $IMG $PXE_CONF_TMP)
#     begin_line=$(echo $lines | awk -F" " '{print $1}')
#     end_line=$(echo $lines | awk -F" " '{print $2}')
#     case "$ACT" in
#       "hide")
#         [ -n "$VERBOSE" ] && echo "Hide $IMG in $PXE_CONF_TMP... "
#         sub_act_cmd="if ($begin_line..$end_line) {s/^(#|[[:space:]])*MENU HIDE.*/  MENU HIDE/i}"
#         ;;
#       "reveal")
#         [ -n "$VERBOSE" ] && echo "Reveal $IMG in $PXE_CONF_TMP... "
#         sub_act_cmd="if ($begin_line..$end_line) {s/^(#|[[:space:]])*MENU HIDE.*/  # MENU HIDE/i}"
#         ;;
#     esac
#     perl -pi -e "$sub_act_cmd" $PXE_CONF_TMP
#}
#
delete_label_block_pxe_img() {
  local LABEL="$1"
  local PXE_CONF_TMP="$2"
  local lines begin_line end_line rc
  [ -z "$LABEL" -o -z "$PXE_CONF_TMP" ] && return 1
  lines=$(get_pxecfg_image_block $LABEL $PXE_CONF_TMP)
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  # delete lines between $begin_line and $end_line
  perl -i -ne "print unless $begin_line..$end_line" $PXE_CONF_TMP
  rc=$?
  return $rc
} # end of delete_label_block_pxe_img
#
delete_menuentry_block_grub_img() {
  local ENTRY_ID="$1"
  local GRUB_CONF_TMP="$2"
  local lines begin_line end_line rc
  [ -z "$ENTRY_ID" -o -z "$GRUB_CONF_TMP" ] && return 1
  if [ -n "$GRUB_CONF_TMP" -a ! -e "$GRUB_CONF_TMP" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "File $GRUB_CONF_TMP not found. No support for uEFI network boot."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 2
  fi
  lines="$(get_grub_efi_image_block "--id $ENTRY_ID" $GRUB_CONF_TMP)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')
  # delete lines between $begin_line and $end_line
  perl -i -ne "print unless $begin_line..$end_line" $GRUB_CONF_TMP
  rc=$?
  return $rc
} # end of delete_label_block_pxe_img
#
ask_lang_set() {
  local language_opt="$1"
  local chosen_lang_var
  # lang will be the global variable
  # get the language
  if [ -z "$language_opt" ]; then
    # Try the Environment variable "LC_ALL", then "LANG"
    if [ -n "$LC_ALL" ]; then
      chosen_lang_var="$LC_ALL"
    elif [ -n "$LANG" ]; then
      chosen_lang_var="$LANG"
    fi
    # Normally we use the locale format like: en_US.UTF-8, however, it's possible it is en_US.utf8. Therefore here we format it to be *.UTF-8.
    chosen_lang_var="$(LC_ALL=C echo $chosen_lang_var | sed -e "s/\.utf8/.UTF-8/g")"
    if [ -n "$chosen_lang_var" -a -e "$DRBL_SCRIPT_PATH/lang/bash/$chosen_lang_var" ] ; then
      lang_answer="$chosen_lang_var"
    else
      lang_answer="en_US.UTF-8"
    fi
  elif [ "$language_opt" = "ask" -o "$language_opt" = "a" ]; then
    # Language
    echo "Language?".
    echo "[0]: English"
    echo "[2]: Traditional Chinese (UTF-8, Unicode) - Taiwan"
    echo -n "[0] "
    read lang_answer
    [ -z "$lang_answer" ] && lang_answer="en_US.UTF-8"
  else
    lang_answer="$language_opt"
  fi
} # end of ask_lang_set

load_lang_set() {
  lang_answer=$1
  # The language files are en, tw.UTF-8, we have to format the input parameter.
  case "$lang_answer" in
     2|zh_TW.UTF-8|zh_TW.utf8|tw.UTF-8|tw.utf8)
        lang="zh_TW.UTF-8"
        ;;
     C)
        lang="en_US.UTF-8"
        ;;
     *)
        if [ -n "$lang_answer" -a -e "$DRBL_SCRIPT_PATH/lang/bash/$lang_answer" ] ; then
          lang="$lang_answer"
        else
          lang="en_US.UTF-8"
        fi
  esac
  
  # get the l10n message
  if [ -n "$lang" -a -e "$DRBL_SCRIPT_PATH/lang/bash/$lang" ] ; then
    . $DRBL_SCRIPT_PATH/lang/bash/$lang
  elif [ -n "$lang" -a -e "$DRBL_SCRIPT_PATH/lang/bash/${lang%.UTF-8}" ] ; then
    . $DRBL_SCRIPT_PATH/lang/bash/${lang%.UTF-8}
  else
    echo "No such language option '$lang'!!!"
    exit 1
  fi
} # end of load_lang_set
#
ask_and_load_lang_set() {
  local language_opt="$1"
  ask_lang_set $language_opt
  load_lang_set $lang_answer
} # end of ask_and_load_lang_set

#
language_help_prompt_by_idx_no() {
  echo " -l, --language INDEX Set the language to be shown by index number:"
  echo "       [0|en_US.UTF-8]: English,"
  echo "       [2|zh_TW.UTF-8]: Traditional Chinese (UTF-8, Unicode) - Taiwan"
  echo "       [a|ask]: Prompt to ask the language index"
  echo " This option is for backward compatibility. It's recommended to use locales to assign that."
}
#
language_help_prompt_by_idx_name() {
  echo "-ln  NAME    Set the language to be shown by index name, not number, such as en_US.UTF-8, zh_TW.UTF-8"
}

# For update-rc.d in Debian
prepare_update_rc_d_env() {
  local newroot="$1"
  local perl_lib_need insserv_lib_need
  [ -z "$newroot" ] && exit 1
  # for update-rc.d
  cp -f --parents /usr/sbin/update-rc.d $newroot
  cp -f --parents /usr/bin/perl $newroot
  perl_lib_need="$(LC_ALL=C ldd /usr/bin/perl | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')"
  export DESTDIR="$newroot"
  for imod in $perl_lib_need; do
    # Skip linux-vdso.so.1 and linux-gate.so.1, the virtual DSO, a shared object exposed by the kernel. They do not exist on the file system. Ref: http://ilivetoseek.wordpress.com/2011/10/24/linux-gate-so-1-or-linux-vdso-so-1/ 
    [ "$imod" = "linux-vdso.so.1" ] && continue
    [ "$imod" = "linux-gate.so.1" ] && continue
    #cp --parents -d $imod $newroot
    copy_exec_drbl $imod "$(LC_ALL=C dirname $imod)"
  done
  # Ugly! we need some perl pm...
  mkdir -p $newroot/usr/{share,lib}
  # For perl >=5.20 in Debian, multi-arch is enabled
  # e.g. /usr/lib/i386-linux-gnu/perl, /usr/lib/x86_64-linux-gnu/perl/
  rsync -a /usr/share/perl $newroot/usr/share/
  if [ -n "$(ls /usr/lib/*perl* 2>/dev/null)" ]; then
    rsync -a /usr/lib/*perl* $newroot/usr/lib/
  fi
  if [ -d "/usr/lib/i386-linux-gnu/perl" ]; then
    mkdir -p $newroot/usr/lib/i386-linux-gnu/
    rsync -a /usr/lib/i386-linux-gnu/perl $newroot/usr/lib/i386-linux-gnu/
  fi
  if [ -d "/usr/lib/x86_64-linux-gnu/perl" ]; then
    mkdir -p $newroot/usr/lib/x86_64-linux-gnu/
    rsync -a /usr/lib/x86_64-linux-gnu/perl $newroot/usr/lib/x86_64-linux-gnu/
  fi

  # for insserv
  if type insserv &>/dev/null; then
    cp -f --parents /sbin/insserv $newroot
    insserv_lib_need="$(LC_ALL=C ldd /sbin/insserv | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')"
    for imod in $insserv_lib_need; do
      [ "$imod" = "linux-vdso.so.1" ] && continue
      [ "$imod" = "linux-gate.so.1" ] && continue
      cp --parents -d $imod $newroot
    done
  fi
} # end of prepare_update_rc_d_env

#
clean_update_rc_d_env() {
  local newroot="$1"
  [ -z "$newroot" ] && exit 1
  # we can clean files in /usr/bin and /usr/sbin in common_root because they are mount ponts.
  [ -f $newroot/usr/bin/perl ] && rm -f $newroot/usr/bin/perl 
  [ -f $newroot/usr/sbin/update-rc.d ] && rm -f $newroot/usr/sbin/update-rc.d
  perl_lib_need=$(LC_ALL=C ldd /usr/bin/perl | sed -e "s/.*=> //g" -e "s/(0x.*)//g" | awk '{print $1}')
  for f2rm in $perl_lib_need; do
    [ -f $newroot/$f2rm ] && rm -f $newroot/$f2rm
  done
}

#
chk_deb_installed () {
  local pkg_name=$1
  local RC
  [ -z "$pkg_name" ] && exit 1
  # dpkg version 1.17.13 has a bug which fails to update /var/lib/dpkg/available in bootstrap environment.
  # Therefore the option --print-avail fails. We switched to use "dpkg -L".
  #dpkg-query --print-avail $pkg_name &>/dev/null
  dpkg -L $pkg_name &>/dev/null
  RC=$?
  return $RC
}
#
copy_rc1d_for_drbl_ssi() {
  # Note! use absolute path for template_cli 
  local template_cli="$1"
  echo -n "Copying files to $drbl_common_root/drbl_ssi for DRBL SSI... "
  mkdir -p "$drbl_common_root/drbl_ssi/rc1.d"
  if [ -z "$template_cli" ]; then
    for ih in $drblroot/*; do
      # use the 1st one drbl client we found as template
      if [ -d "$ih" ]; then
        template_cli="$ih"
        break
      fi
    done
  fi
  cp -af $template_cli/$RCX_ROOTDIR/rc1.d/* $drbl_common_root/drbl_ssi/rc1.d/
  echo "done!"
} # end of copy_rc1d_for_drbl_ssi
#
remove_rc1d_for_drbl_ssi() {
  # Note! use absolute path for template_cli 
  local template_cli="$1"
  echo -n "Resetting files of $drbl_common_root/drbl_ssi for DRBL SSI... "
  # we just clean the unnecessary files, keep the directory
  if [ -d "$drbl_common_root/drbl_ssi/rc1.d" ]; then
    rm -rf $drbl_common_root/drbl_ssi/rc1.d
  fi
  echo "done!"
} # end of remove_rc1d_for_drbl_ssi
#
prepare_gdm_custom_conf(){
  # For ubuntu 9.10, the gdm 2.28.1-0ubuntu does not put /etc/gdm/custom.conf in the deb. It will be added when user creates it.
  if [ -n "$($query_pkglist_cmd gdm 2>/dev/null | grep -F "/usr/share/doc/gdm/examples/custom.conf")" ]; then
   # It must be /etc/gdm/custom.conf. We prepare one if not exits.
   # (1) For server, since drbl-powerful-thin-client might need that:
   if [ ! -e "/etc/gdm/custom.conf" ]; then
     cp -a /usr/share/doc/gdm/examples/custom.conf /etc/gdm/custom.conf
   fi
   # (2) For client. We always use the one from /usr/share/doc/gdm/examples/custom.conf in case /etc/gdm/custom.conf is modified.
   cp -af /usr/share/doc/gdm/examples/custom.conf $drbl_common_root/etc/gdm/custom.conf
   if [ -z "$(grep -E "^\[daemon\]" $drbl_common_root/etc/gdm/custom.conf 2>/dev/null)" ]; then
     echo "" >> $drbl_common_root/etc/gdm/custom.conf
     echo "[daemon]" >> $drbl_common_root/etc/gdm/custom.conf
   fi
   GDM_CFG="/etc/gdm/custom.conf"
  fi
} # end of prepare_gdm_custom_conf
#
get_gdm_kdm_conf_filename() {
  # Get the gdm, kdm, mdm config:
  # Ex: this is the setting for gdm 2.13 before and kdm 2.x/3.x
  # GDM_CFG="/etc/X11/gdm/gdm.conf"
  # FAC_GDM_CFG="/etc/X11/gdm/factory-gdm.conf"
  # KDM_CFG="/etc/kde3/kdm/kdmrc"
  # MDM_CFG="/etc/mdm/mdm.conf"
  # For gdm 2.13 or later, different filenames, such as custom.conf, gdm.conf-custom and kdmrc, no more factory-gdm.conf
  # For Ubuntu 9.10, since upstart use /etc/init/gdm.conf, we have to exclude that.
  GDM_CFG=""
  # The order "gdm.conf-custom custom.conf gdm.conf" is important, we put gdm.conf as the last one, since we wan to get only one $GDM_CFG, gdm.conf is always the last one to choose, if we can get gdm.conf-custom or custom.conf, we use that first
  # Note: Even in SuSE, gdm.conf/custom.conf is in /etc/opt/gnome/gdm/gdm.conf, we can get it by rpm -ql gdm, unlike kdm. It's not necessary to put /etc/ in the beginning.
  # For OpenSuSE 11.1, /etc/gdm/custom.conf is from package gdm-branding-openSUSE, and there is another same file name /etc/dbus-1/system.d/gdm.conf from package gdm, and /etc/dbus-1/system.d/gdm.conf is NOT what we want.
  for ipkg in gdm3 gdm gdm-branding-openSUSE; do
    for ig in daemon.conf gdm.conf-custom custom.conf gdm.conf; do
      GDM_CFG="$($query_pkglist_cmd $ipkg 2>/dev/null | grep -E "\/$ig$" | grep -Ev "dbus" | grep -Evi "examples" | grep -Evi "\/etc\/init\/")"
      [ -n "$GDM_CFG" ] && break
    done
    [ -n "$GDM_CFG" ] && break
  done
  FAC_GDM_CFG="$($query_pkglist_cmd gdm 2>/dev/null | grep -E "\/factory-gdm.conf$")"
  if [ -z "$GDM_CFG" ]; then
    prepare_gdm_custom_conf
  fi

  # kdmrc maybe in package kdm (Debian-based), kdebase (FC), kdebase-kdm-config-file (Mandrake) or kdebase3-kdm (OpenSuSE)
  # In FC, there are 2 kdmrc:
  # /etc/X11/xdm/kdmrc
  # /etc/kde/kdm/kdmrc
  # But /etc/X11/xdm/kdmrc is actually linked to /etc/kde/kdm/kdmrc, so use either one will be ok.
  for ipkg in kde4-kdm kdm kdebase kdebase-kdm-config-file kdebase3-kdm; do
    KDM_CFG="$($query_pkglist_cmd $ipkg 2>/dev/null | grep -E "(\/kdmrc$)" | head -n 1)"
    if [ -n "$(echo $KDM_CFG | grep -E "^\/opt\/kde")" ]; then
      # For SuSE 10.1 or earlier, actually the config file is in /etc/opt/kde3/share/config/kdm/kdmrc, therefore put /etc/ in the beginning.
      # For SuSE 10.2, no more /etc/opt/kde3/share/config/kdm/kdmrc, only /opt/kde3/share/config/kdm/kdmrc
      # Ref: http://lists.opensuse.org/opensuse-factory/2006-09/msg00021.html
      [ -e "/etc/$KDM_CFG" ] && KDM_CFG=/etc/$KDM_CFG
    fi
    [ -n "$KDM_CFG" ] && break
  done
  # For lightdm
  if [ -e "/etc/lightdm/lightdm.conf" ]; then
    LIGHTDM_CFG=/etc/lightdm/lightdm.conf
  elif [ -d "/etc/lightdm/lightdm.conf.d" ]; then
    # For Ubuntu 13.10, lightdm 1.8.4 has different initial configration file. 
    # "/etc/lightdm/lightdm.conf" does not exist in the initial installation. 
    # While it will exist when a user configures that in the GUI.
    LIGHTDM_CFG=/etc/lightdm/lightdm.conf
  elif [ -d "/usr/share/lightdm/lightdm.conf.d" -a \
	 -e "/usr/share/doc/lightdm/lightdm.conf.gz" ]; then
    # For Ubuntu 14.04, lightdm 1.10 has different way. The /etc/lightdm/lightdm.conf.d has been moved to /usr/share/lightdm/lightdm.conf.d, and /etc/lightdm/lightdm.conf does not exist in the beginning. Only a sample file exists in "/usr/share/doc/lightdm/lightdm.conf.gz".
    if [ ! -f "$drbl_common_root/etc/lightdm/lightdm.conf" ]; then
      zcat "/usr/share/doc/lightdm/lightdm.conf.gz" > "$drbl_common_root/etc/lightdm/lightdm.conf"
    fi
    LIGHTDM_CFG=/etc/lightdm/lightdm.conf
  fi

  # For mdm : by Ceasar for Linuxmint
  if [ -e "/etc/mdm/mdm.conf" ]; then
    # for mdm v2.0
    MDM_CFG=/etc/mdm/mdm.conf
  fi

} # end of get_gdm_kdm_conf_filename
#
get_block_line_in_gdm_kdm() {
  local session="$1"
  local CFG_FILE="$2"
  [ -e "$CFG_FILE" ] || exit 1
  # Take xdmcp as an example:
  # Turn on the Enable=true in [xdmcp]
  # Enable=true
  # By using
  # grep -n "^\[.*\]" gdm.conf |grep -A1 "\[xdmcp\]"                 
  # We can get the results like:
  # 175:[xdmcp]
  # 210:[gui]
  # so we know we can replace the one between line no. 175 and 210
  between_lines="$(LC_ALL=C grep -n "^\[.*\]" $CFG_FILE |grep -i -A1 "\[$session\]" | cut -d":" -f1)"
  begin_line="$(echo $between_lines | awk -F" " '{print $1}')"
  end_line="$(echo $between_lines | awk -F" " '{print $2}')"
  if [ -z "$begin_line" -a -z "$end_line"  ]; then
    # no this session in file. Use the last line to append.
    begin_line="$(LC_ALL=C wc -l $CFG_FILE | awk -F" " '{print $1}')"
    end_line="$(LC_ALL=C wc -l $CFG_FILE | awk -F" " '{print $1}')"
  elif [ -z "$end_line"  ]; then
    # if end_line is nothing, it must be the last block, i.e. we can not find the next [.*]
    end_line="$(LC_ALL=C wc -l $CFG_FILE | awk -F" " '{print $1}')"
  else
    # if not nothing, backword one line
    end_line="$(($end_line - 1))"
  fi
  echo "$begin_line $end_line"
} # end of get_block_line_in_gdm_kdm

#
get_dhcpdlease_dir() {
  if [ -e /etc/debian_version ]; then
    # Debian
    if [ -d "/var/lib/dhcp" ]; then
      DHCPDLEASE_DIR="/var/lib/dhcp"
    elif [ -d "/var/lib/dhcp3" ]; then
      DHCPDLEASE_DIR="/var/lib/dhcp3"
    fi
  elif [ -e /etc/SuSE-release ]; then
    # SuSE
    DHCPDLEASE_DIR="/var/lib/dhcp/db"
  else
    # RH-like
    # FC5: /var/lib/dhcpd/dhcpd.leases
    # RH 8.0/9, FC1-4: /var/lib/dhcp/dhcpd.leases
    # So this method is better:
    DHCPDLEASE_DIR="$(dirname `rpm -ql dhcp | grep -E "dhcpd.leases$"`)"
  fi
}
#
countdown () {
 local time_limit="$1"
 local i
       ( i="$time_limit"
         while [ "$i" -ne 0  ]; do
           echo -n "$i "
           sleep 1
           i=$((i-1))
         done
       )
}
#
is_drbl_client() {
  root_src="$(LC_ALL=C mount | grep -Ew "on /" | awk -F" " '{print $1}')"
  # Example for $root_src: 192.168.50.254:/tftpboot/node_root
  if [ -n "$(echo $root_src | grep -E "^[[:space:]]*([[:digit:]]+\.){3}[[:digit:]]+:/.*")" ] ; then
   rc=0
  else
   rc=1
  fi
  return $rc
}
#
add_param_in_pxelinux_cfg_drbl_related_block() {
  local PXE_CONF="$1"
  local param_tmp="$2"
  [ -z "$param_tmp" ] && echo "You have to assign param_tmp in function add_param_in_pxelinux_cfg_drbl_related_block!" && return 1
  for iblock in drbl drbl-terminal; do
    lines="$(get_pxecfg_image_block $iblock $PXE_CONF)"
    begin_line="$(LC_ALL=C echo $lines | awk -F" " '{print $1}')"
    end_line="$(LC_ALL=C echo $lines | awk -F" " '{print $2}')"
    tag_found="$(LC_ALL=C head -n $end_line $PXE_CONF | tail -n $(($end_line-$begin_line)) | grep -Ei "^[[:space:]]*append[[:space:]]*.*[[:space:]]+$param_tmp([[:space:]]+|$)")"
    if [ -z "$tag_found" ]; then
      sub_menu_label_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*append[[:space:]]+.*)|\$1 $param_tmp|i}"
      perl -pi -e "$sub_menu_label_cmd" $PXE_CONF
    fi
  done
} # end of add_param_in_pxelinux_cfg_drbl_related_block
#
del_param_in_pxelinux_cfg_drbl_related_block() {
  local PXE_CONF="$1"
  local param_tmp="$2"
  [ -z "$param_tmp" ] && echo "You have to assign param_tmp in function del_param_in_pxelinux_cfg_drbl_related_block!" && return 1
  for iblock in drbl drbl-terminal; do
    lines="$(get_pxecfg_image_block $iblock $PXE_CONF)"
    begin_line="$(LC_ALL=C echo $lines | awk -F" " '{print $1}')"
    end_line="$(LC_ALL=C echo $lines | awk -F" " '{print $2}')"
    tag_found="$(LC_ALL=C head -n $end_line $PXE_CONF | tail -n $(($end_line-$begin_line)) | grep -Ei "^[[:space:]]*append[[:space:]]*.*[[:space:]]+$param_tmp([[:space:]]+|$)")"
    if [ -n "$tag_found" ]; then
      sub_menu_label_cmd="if ($begin_line..$end_line) {s|$param_tmp||i}"
      perl -pi -e "$sub_menu_label_cmd" $PXE_CONF
    fi
  done
} # end of del_param_in_pxelinux_cfg_drbl_related_block
#
ocs_advanced_param_post_mode_after_clone() {
  local ocs_parm # The file to output the result //NOTE// This is to be append, not overwritten.
  local default_postaction="reboot " # //NOTE// Extra space is required
  # For Clonezilla SE mode, we always ask this (reboot, poweroff...) no matter it's advanced or beginner mode.
  while [ $# -gt 0 ]; do
    case "$1" in
      -d|--default-menu) 
           shift; 
           if [ -z "$(echo $1 |grep ^-.)" ]; then
             # skip the -xx option, in case 
             default_postaction="$1"
             shift;
           fi
           [ -z "$default_postaction" ] && USAGE && exit 1
           ;;
       *)   break ;;
    esac
  done
  ocs_parm="$1"
  if [ -z "$ocs_postmode" ]; then
    # //NOTE// Extra space is required in the --default-item.
    $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
    "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" \
    --default-item "-p $default_postaction " \
    --menu "$msg_choose_post_mode_after_clone:" \
    0 0 0 $DIA_ESC \
    "-p reboot "    "$msg_ocs_param_p_reboot" \
    "-p poweroff "  "$msg_ocs_param_p_poweroff" \
    "-p choose "    "$msg_ocs_param_p_choose" \
    "-p true "      "$msg_ocs_param_p_true" \
    2>> $ocs_parm
  else
    echo "-p $ocs_postmode " >> $ocs_parm
  fi
} # end of ocs_advanced_param_post_mode_after_clone
#
ocs_sr_param_postaction_after_clone() {
  local ocs_parm="$1" # The file to output the result //NOTE// This is to be append, not overwritten.
  $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
  "$msg_mode: $ocs_mode_prompt" --menu "$msg_choose_post_mode_after_clone_1:" \
  0 0 0 $DIA_ESC \
  "-p choose "    "$msg_ocs_param_p_choose_1" \
  "-p true"       "$msg_enter_cml" \
  "-p reboot "    "$msg_ocs_param_p_reboot_1" \
  "-p poweroff "  "$msg_ocs_param_p_poweroff_1" \
  2>> $ocs_parm
} # end of ocs_sr_param_postaction_after_clone
#
ocs_onthefly_param_postaction_after_clone() {
  local ocs_parm="$1" # The file to output the result //NOTE// This is to be append, not overwritten.
  $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
  "$msg_mode: $ocs_mode_prompt" --menu "$msg_choose_post_mode_after_clone_1:" \
  0 0 0 $DIA_ESC \
  "-p choose "    "$msg_ocs_param_p_choose_1" \
  "-p true"       "$msg_enter_cml" \
  "-p reboot "    "$msg_ocs_param_p_reboot_1" \
  "-p poweroff "  "$msg_ocs_param_p_poweroff_1" \
  2>> $ocs_parm
} # end of ocs_onthefly_param_postaction_after_clone
#
show_z4_or_above_menu_or_not() {
  # function to show -z4, -z5/z5p, -z6/z6p options
  if type lzma &>/dev/null; then
    # "-z4"      "$msg_ocs_param_z4" \
    ocs_z4_option_1="-z4"
    ocs_z4_option_2="$(rep_whspc_w_udrsc "$msg_ocs_param_z4")"
  fi
  if type xz &>/dev/null; then
    # "-z5"      "$msg_ocs_param_z5" \
    ocs_z5_option_1="-z5"
    ocs_z5_option_2="$(rep_whspc_w_udrsc "$msg_ocs_param_z5")"

    # "-z5p"      "$msg_ocs_param_z5p" \
    ocs_z5p_option_1="-z5p"
    ocs_z5p_option_2="$(rep_whspc_w_udrsc "$msg_ocs_param_z5p")"
  fi
  if type lzip &>/dev/null; then
    # "-z6"      "$msg_ocs_param_z6" \
    ocs_z6_option_1="-z6"
    ocs_z6_option_2="$(rep_whspc_w_udrsc "$msg_ocs_param_z6")"
  fi
  if type plzip &>/dev/null; then
    # "-z6p"      "$msg_ocs_param_z6p" \
    ocs_z6p_option_1="-z6p"
    ocs_z6p_option_2="$(rep_whspc_w_udrsc "$msg_ocs_param_z6p")"
  fi
  if type lrzip &>/dev/null; then
    # "-z7"      "$msg_ocs_param_z7" \
    ocs_z7_option_1="-z7"
    ocs_z7_option_2="$(rep_whspc_w_udrsc "$msg_ocs_param_z7")"
  fi
  if type lz4 &>/dev/null; then
    # "-z8"      "$msg_ocs_param_z8" \
    ocs_z8_option_1="-z8"
    ocs_z8_option_2="$(rep_whspc_w_udrsc "$msg_ocs_param_z8")"
    # "-z8p"      "$msg_ocs_param_z8p" \
    ocs_z8p_option_1="-z8p"
    ocs_z8p_option_2="$(rep_whspc_w_udrsc "$msg_ocs_param_z8p")"
  fi
  if type zstd &>/dev/null; then
    # "-z9"      "$msg_ocs_param_z9" \
    ocs_z9_option_1="-z9"
    ocs_z9_option_2="$(rep_whspc_w_udrsc "$msg_ocs_param_z9")"
  fi
  if type zstdmt &>/dev/null; then
    # "-z9p"      "$msg_ocs_param_z9p" \
    ocs_z9p_option_1="-z9p"
    ocs_z9p_option_2="$(rep_whspc_w_udrsc "$msg_ocs_param_z9p")"
  fi
} # end show_z4_or_above_menu_or_not
#
set_drbl_ocs_extra_param() {
  local mode
  # OCS_PARAM_TMP is a global variable
  local dev_
  local vol_size_tmp
  local ASK_VOL_SIZE=1
  local inst_grub_opt
  local set_y_opt="yes"  # Option to set option y* (y0/y1/y2)
  local default_postaction postaction_opt j2_switch_msg_1 j2_switch_msg_2 j2_switch_msg_3
  
  while [ $# -gt 0 ]; do
    case "$1" in
      -s|--skip-y) set_y_opt="no"; shift;;
      -p|--default-postaction) 
           shift; 
           if [ -z "$(echo $1 |grep ^-.)" ]; then
             # skip the -xx option, in case 
             default_postaction="$1"
             shift;
           fi
           [ -z "$default_postaction" ] && USAGE && exit 1
	   ;;
       *)  break ;;
    esac
  done
  
  mode="$1"
  dev_="$2"
  vol_size_tmp="$(mktemp /tmp/vol_size_tmp.XXXXXX)"

  if [ -z "$OCS_PARAM_TMP" ]; then
    echo "\"$OCS_PARAM_TMP\" was not assigned in function set_drbl_ocs_extra_param."
    echo "$msg_program_stop!"
    exit 1
  fi
  
  # If the mode is only for parts, we won't turn on "-g auto" option by default
  case "$dev_" in
    parts) inst_grub_opt="off"
  	 # For restoreparts, forget about clean mbr
  	 skip_clean_mbr_opt="on"
  	 ;;
        *) inst_grub_opt="on"
  	 # For restoredisk, do mbr cleaning
  	 skip_clean_mbr_opt="off"
           ;;
  esac
  
  if [ "$mode" = "restore" ]; then
    if [ "$ocs_user_mode" = "expert" ]; then
      # The option "-j2" (clone_hidden_data) should be only enabled by default when it's restoredisk
      # Ref: https://sourceforge.net/p/clonezilla/bugs/361/
      case "$dev_" in 
        parts) # For restoreparts
	       j2_switch_msg_1=""
	       j2_switch_msg_2=""
	       j2_switch_msg_3=""
	       ;;
        disk)  # For restoredisk
	       j2_switch_msg_1="-j2"
	       j2_switch_msg_2="$(rep_whspc_w_udrsc "$msg_ocs_param_j2")"
	       j2_switch_msg_3="on"
	       ;;
      esac
      $DIA --separate-output --backtitle "$msg_nchc_free_software_labs" --title  \
      "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --checklist "$msg_choose_param_to_set_multiple_choices ($msg_press_space_to_mark_selection)" \
      0 0 0 $DIA_ESC \
      "-g auto"  "$msg_ocs_param_g_auto" $inst_grub_opt \
      "-e1 auto" "$msg_ocs_param_e1_auto" on \
      "-e2"      "$msg_ocs_param_e2" on \
      "-x"       "$msg_ocs_param_x" on \
      "-nogui"   "$msg_ocs_param_nogui" off \
      "-hn0 $WIN_HOSTNAME_PREFIX"  "$msg_ocs_param_hn0" off \
      "-hn1 $WIN_HOSTNAME_PREFIX"  "$msg_ocs_param_hn1" off \
      "-v"       "$msg_ocs_param_v" off \
      "-c"       "$msg_ocs_param_c" off \
      "-u"       "$msg_ocs_param_u" off \
      "-t"       "$msg_ocs_param_t" $skip_clean_mbr_opt \
      "-t1"      "$msg_ocs_param_t1" off \
      "-t2"      "$msg_ocs_param_t2" off \
      "-r"       "$msg_ocs_param_r" off \
      "-ns"      "$msg_ocs_param_ns" off \
      "-e"       "$msg_ocs_param_e" off \
      "-icrc"    "$msg_ocs_param_icrc" off \
      "-irhr"    "$msg_ocs_param_irhr" off \
      "-irvd"    "$msg_ocs_param_irvd" off \
      "-ius"     "$msg_ocs_param_ius" off \
      "-iui"     "$msg_ocs_param_iui" off \
      "-icds"    "$msg_ocs_param_icds" off \
      "-iefi"    "$msg_ocs_param_iefi" off \
      "-j1"      "$msg_ocs_param_j1" off \
      $j2_switch_msg_1 $j2_switch_msg_2 $j2_switch_msg_3 \
      "-cm"      "$msg_ocs_param_cm" off \
      "-cs"      "$msg_ocs_param_cs" off \
      "-cb2"     "$msg_ocs_param_cb2" off \
      "-cb3"     "$msg_ocs_param_cb3" off \
      "-cmf"     "$msg_ocs_param_cmf" off \
      "-f"       "$msg_ocs_param_f" off \
      "-rescue " "$msg_ocs_param_rescue" off \
      "-s"       "$msg_ocs_param_s" off \
      "-a"       "$msg_ocs_param_a" off \
      "-o0"      "$msg_ocs_param_o0" off \
      "-o1"      "$msg_ocs_param_o1" off \
      "-srel"    "$msg_ocs_param_srel" off \
      "-ssnf"    "$msg_ocs_param_ssnf" off \
      "-ps"      "$msg_ocs_param_ps" off \
      "-edio"    "$msg_ocs_param_edio" on \
      "-rmtd"    "$msg_ocs_param_rmtd" off \
      "-rmmcb"   "$msg_ocs_param_rmmcb" off \
      "-reluks"  "$msg_ocs_param_reluks" off \
    2>> $OCS_PARAM_TMP
    else
      # Beginner mode. Use default settings
      if [ "$inst_grub_opt" = "on" ]; then
        # restoredisk mode.
        # "$inst_grub_opt" = "on" (-g auto) means skip_clean_mbr_opt="off" (no -t)
        echo "-g auto" "-e1 auto" "-e2" "-r" "-x" "-j2" "-edio" >> $OCS_PARAM_TMP
      else
        # restoreparts mode.
        # "$inst_grub_opt" = "off" (no "-g auto") means skip_clean_mbr_opt="on" (-t)
        # Do not enable -j2 by default since for restoreparts, it should not be done by default.
        # Ref: https://sourceforge.net/p/clonezilla/bugs/361/
        echo "-e1 auto" "-e2" "-t" "-r" "-x" "-edio" >> $OCS_PARAM_TMP
      fi
    fi
  
    # About partition table
    case "$dev_" in 
    parts)
      # Partition restore only. default NOT to create partition table
      if [ "$ocs_user_mode" = "expert" ]; then
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_hint_for_fdisk \n$msg_choose_param_to_set_single_choice" \
        0 0 0 $DIA_ESC \
        "-k "      "$msg_ocs_param_k"  \
        "-k1 "     "$msg_ocs_param_k1"  \
        "-k2 "     "$msg_ocs_param_k2"  \
        "-j0 "     "$msg_ocs_param_j0" \
        "-k0 "     "$msg_use_the_part_table_from_image"  \
        "exit "    "$msg_exit" \
        2>> $OCS_PARAM_TMP
      else
        echo "-k " >> $OCS_PARAM_TMP
      fi
      ;;
    *)
      # Disk restore, default to create partition table
      if [ "$ocs_user_mode" = "expert" ]; then
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_hint_for_fdisk \n$msg_choose_param_to_set_single_choice" \
        0 0 0 $DIA_ESC \
        "-k0 "     "$msg_use_the_part_table_from_image"  \
        "-k "      "$msg_ocs_param_k"  \
        "-k1 "     "$msg_ocs_param_k1"  \
        "-k2 "     "$msg_ocs_param_k2"  \
        "-j0 "     "$msg_ocs_param_j0" \
        "exit "    "$msg_exit" \
        2>> $OCS_PARAM_TMP
      else
        # Beginner mode.
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_mode: $ocs_mode_prompt" --menu "$msg_hint_for_fdisk_beginner \n$msg_choose_default_param_if_no_idea" \
        0 0 0 $DIA_ESC \
        "-k0 "     "$msg_use_the_part_table_from_image"  \
        "-k1 "     "$msg_ocs_param_k1"  \
        "exit "    "$msg_exit" \
        2>> $OCS_PARAM_TMP
      fi
      ;;
    esac
    if grep -Ew "exit" $OCS_PARAM_TMP &>/dev/null; then
      echo "$msg_program_stop"
      exit 1
    fi
    # Question about checking the image is restorable or not. By default, no matter it's beginner or advanced mode, 
    # we will ask.
    if [ -z "$chk_img_restoreable_on_srv" ]; then
      $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
      "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_if_checking_image_restorable_before_restoring_on_this_server" \
      0 0 0 $DIA_ESC \
      " "     "$msg_ocs_param_check_img_restorable_before_restoring" \
      "-sc0 " "$msg_ocs_param_skip_checking_img_restorable_before_restoring" \
      2>> $OCS_PARAM_TMP
    else
      echo " " >> $OCS_PARAM_TMP
    fi
    if LC_ALL=C grep -Ew -- "(-k1|-k2)" $OCS_PARAM_TMP &>/dev/null; then
      # Option -k1 or -k2 is for different partition size, turn on -r and -icds by default
      if [ -z "$(LC_ALL=C grep -Ew -- "-r" $OCS_PARAM_TMP)" ]; then
        echo "Since the mode you choose might resize partition size, we turn on file system resize funtion automatically (-r)..."
        echo "-r " >> $OCS_PARAM_TMP
      fi
      if [ -z "$(LC_ALL=C grep -Ew -- "-icds" $OCS_PARAM_TMP)" ]; then
        echo "Since the mode you choose might resize partition size, we now enable option \"-icds\" to ignore the partition size checking in Partclone..."
        echo "-icds ">> $OCS_PARAM_TMP
      fi
    fi
  
    # about y[0-2]
    if [ "$set_y_opt" = "yes" ]; then
      if [ "$ocs_user_mode" = "expert" ]; then
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_if_always_provide_clonezilla_srv" \
        0 0 0 $DIA_ESC \
        " "         "$msg_ocs_param_skip" \
        "-y0 "      "$msg_ocs_param_y0" \
        "-y1 "      "$msg_ocs_param_y1" \
        "-y2 "      "$msg_ocs_param_y2" \
        2>> $OCS_PARAM_TMP
      else
        echo " " >> $OCS_PARAM_TMP
      fi
    fi
  else
    # Save mode.
    # about -q, -q1, -q2
    if [ "$ocs_user_mode" = "expert" ]; then
      $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
      "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_param_for_clone_prog" \
      0 0 0 $DIA_ESC \
      "-q2 "       "$msg_ocs_param_q2" \
      "-q1 "       "$msg_ocs_param_q1" \
      "-q "        "$msg_ocs_param_q" \
      " "          "$msg_ocs_param_none_ie_partimage" \
      2>> $OCS_PARAM_TMP
    else
      echo "-q2 " >> $OCS_PARAM_TMP
    fi
  
    get_smtd_smmcb_switch  # Obtain smtd_smmcb_switch
    if [ "$ocs_user_mode" = "expert" ]; then
      $DIA --separate-output --backtitle "$msg_nchc_free_software_labs" --title  \
      "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --checklist "$msg_choose_param_to_set_multiple_choices ($msg_press_space_to_mark_selection):" \
      0 0 0 $DIA_ESC \
      "-c "        "$msg_ocs_param_c" off \
      "-j2 "       "$msg_ocs_param_j2" on \
      "-nogui "    "$msg_ocs_param_nogui" off \
      "-a "        "$msg_ocs_param_a" off \
      "-batch "    "$msg_ocs_param_b" off \
      "-f "        "$msg_ocs_param_f" off \
      "-s "        "$msg_ocs_param_s" off \
      "-rm-win-swap-hib " "$msg_ocs_param_rm_win_swap_hib" off \
      "-ntfs-ok "  "$msg_ocs_param_ntfs_ok" off \
      "-rescue "   "$msg_ocs_param_rescue" off \
      "-gm "       "$msg_ocs_param_gm" off \
      "-gs "       "$msg_ocs_param_gs" off \
      "-gb2 "      "$msg_ocs_param_gb2" off \
      "-gb3 "      "$msg_ocs_param_gb3" off \
      "-gmf "      "$msg_ocs_param_gmf" off \
      "-noabo "    "$msg_ocs_param_noabo" off \
      "-o0 "       "$msg_ocs_param_o0" off \
      "-o1 "       "$msg_ocs_param_o1" off \
      "-ps "       "$msg_ocs_param_ps" off \
      "-scpt "     "$msg_ocs_param_scpt" off \
      "-sfs "      "$msg_ocs_param_sfs" off \
      "-edio "     "$msg_ocs_param_edio" on \
      "-smtd "     "$msg_ocs_param_smtd" $smtd_smmcb_switch \
      "-smmcb "    "$msg_ocs_param_smmcb" $smtd_smmcb_switch \
      2>> $OCS_PARAM_TMP
    else
      case "$smtd_smmcb_switch" in
         on) echo "-j2 " "-edio " "-smtd " "-smmcb " >> $OCS_PARAM_TMP;;
        off) echo "-j2 " "-edio " >> $OCS_PARAM_TMP;;
      esac
    fi
    # Question about fsck the source partition. By default, no matter it's beginner or advanced mode, we will ask.
    if [ -z "$fsck_src_part_intr" -a -z "$fsck_src_part_auto" ]; then
      $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
      "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_if_fsck_the_source_part" \
      0 0 0 $DIA_ESC \
      " "     "$msg_skip_check_source_fs" \
      "-fsck "   "$msg_ocs_param_fsck_src_part" \
      "-fsck-y " "$msg_ocs_param_fsck_src_part_yes" \
      2>> $OCS_PARAM_TMP
    else
      case "$fsck_src_part_intr" in
        yes) echo "-fsck " >> $OCS_PARAM_TMP;;
          *) echo " " >> $OCS_PARAM_TMP;;
      esac
      case "$fsck_src_part_auto" in
        yes) echo "-fsck-y " >> $OCS_PARAM_TMP;;
          *) echo " " >> $OCS_PARAM_TMP;;
      esac
    fi
  
    # Question about checking the image is restorable or not. By default, no matter it's beginner or advanced mode, 
    # we will ask.
    if [ -z "$chk_img_restoreable_mod_save" ]; then
      $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
      "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_if_checking_image_restorable" \
      0 0 0 $DIA_ESC \
      " "     "$msg_ocs_param_check_img_restorable" \
      "-scs " "$msg_ocs_param_skip_checking_img_restorable" \
      2>> $OCS_PARAM_TMP
    else
      case "$chk_img_restoreable_mod_save" in
        yes) echo " " >> $OCS_PARAM_TMP;;
         no) echo "-scs " >> $OCS_PARAM_TMP;;
      esac
    fi
  fi
  
  if [ -n "$default_postaction" ]; then
    postaction_opt="-d $default_postaction"
  fi
  ocs_advanced_param_post_mode_after_clone $postaction_opt $OCS_PARAM_TMP
  
  # if -hn0|-hn1 is chosen, 
  # (1). prompt the warning about ntfs-3g/nfsmount for ntfs is necessary
  # (2). ask if the hostname prefix want to change
  if grep -qE "\-hn[01]" $OCS_PARAM_TMP; then
    # part 1.
    $DIA --title "$msg_change_hostname_of_MS_WIN_on_the_fly" --clear \
         --msgbox "$msg_write_MS_WIN_is_necessary" 15 70
  
    # part 2.
    HNTMP="$(mktemp /tmp/winhn.XXXXXX)"
    $DIA --backtitle "$msg_nchc_free_software_labs" --title "$msg_nchc_clonezilla" \
    --inputbox "$msg_What_the_win_hostname_prefix ?" 0 0 "$WIN_HOSTNAME_PREFIX" 2> $HNTMP
    HN_PREFIX="$(cat $HNTMP)"
    if [ -z "$HN_PREFIX" ]; then
       echo "You did not specify the hostname prefix for MS windows! We use the default value in drbl-ocs.conf"
    else
       perl -pi -e "s|(-hn.*) $WIN_HOSTNAME_PREFIX|\$1 $HN_PREFIX|g" $OCS_PARAM_TMP
    fi
    [ -f "$HNTMP" ] && rm -f $HNTMP
  fi
  
  if [ "$mode" = "save" ]; then
    # Save mode.
    show_z4_or_above_menu_or_not
    # We can not detect # of the CPU cores in the clients from server, hence let user choose.
    if [ "$ocs_user_mode" = "expert" ]; then
      $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
      "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_one_compression_param_to_save" \
      --default-item "$ocs_z9p_option_1" \
      0 0 0 $DIA_ESC \
      "-z1p"     "$msg_ocs_param_z1p" \
      "-z1"      "$msg_ocs_param_z1" \
      "-z2p"     "$msg_ocs_param_z2p" \
      "-z2"      "$msg_ocs_param_z2" \
      "-z3"      "$msg_ocs_param_z3" \
      $ocs_z4_option_1      $ocs_z4_option_2 \
      $ocs_z5p_option_1     $ocs_z5p_option_2 \
      $ocs_z5_option_1      $ocs_z5_option_2 \
      $ocs_z6p_option_1     $ocs_z6p_option_2 \
      $ocs_z6_option_1      $ocs_z6_option_2 \
      $ocs_z7_option_1      $ocs_z7_option_2 \
      $ocs_z8_option_1      $ocs_z8_option_2 \
      $ocs_z8p_option_1     $ocs_z8p_option_2 \
      $ocs_z9_option_1      $ocs_z9_option_2 \
      $ocs_z9p_option_1     $ocs_z9p_option_2 \
      "-z0"      "$msg_ocs_param_z0" \
      2>> $OCS_PARAM_TMP
      # We need to append a space after this parameter so it won't be connected to next parameter.
      echo -n " " >> $OCS_PARAM_TMP
    else
      # Beginner mode. Question about -z1p and -z9p.
      # We can not detect # of the CPU cores in the clients from server, hence let user choose.
      # Here to make it simple, just use z*p since it works for both single and multiple cores.
      if [ -n "$ocs_z9p_option_1" -a -n "$ocs_z9p_option_2" ]; then
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_one_compression_param_to_save" \
	--default-item "$ocs_z9p_option_1" \
        0 0 0 $DIA_ESC \
        "-z1p"              "$msg_ocs_param_z1p" \
        $ocs_z9p_option_1   $ocs_z9p_option_2 \
        2>> $OCS_PARAM_TMP
        # We need to append a space after this parameter so it won't be connected to next parameter.
        echo -n " " >> $OCS_PARAM_TMP
      else
        echo "-z1p " >> $OCS_PARAM_TMP
      fi
    fi
    # About image volume size
    if [ -z "$dcs_img_vol_limit" ]; then
      trap "[ -f "$vol_size_tmp" ] && rm -f $vol_size_tmp" HUP INT QUIT TERM EXIT
      while [ "$ASK_VOL_SIZE" -ne 0 ]; do
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" --inputbox "$msg_set_image_volume_size" \
        0 0 $VOL_LIMIT_DEFAULT \
        2> $vol_size_tmp
        if [ -n "$(cat $vol_size_tmp | grep -iE "[^[:digit:]]")" ]; then
          ASK_VOL_SIZE=1
          $DIA --backtitle "$msg_nchc_free_software_labs" --title "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" \
          --msgbox "$msg_enter_digits_only\n$msg_please_do_it_again!!!" 0 0 
        else
          ASK_VOL_SIZE=0
        fi
      done
      echo "-i $(cat $vol_size_tmp)" >> $OCS_PARAM_TMP
    else
      echo "-i $dcs_img_vol_limit" >> $OCS_PARAM_TMP
    fi
  fi
  # Force to strip the unnecessary quotation ', this is specially for dialog (from cdialog) in Mandriva and same reason to strip the unnecessary double quotation ", this is sepcially for dialog in OpenSuSE 11.1. Otherwise it will cause -p reboot become (containing space) '-p reboot', which is wrong option in dcs.
  LC_ALL=C perl -pi -e "s/\'//g" $OCS_PARAM_TMP
  LC_ALL=C perl -pi -e "s/\"//g" $OCS_PARAM_TMP
  #
  [ -e "$vol_size_tmp" ] && rm -f $vol_size_tmp
} # end of set_drbl_ocs_extra_param

#
set_ocs_sr_extra_param() {
# This function is used to be called inside ocs-sr, not from other program.
local mode="$1"
# OCS_PARAM_TMP is a global variable
local mode2_="$2"
local cpu_no
local vol_size_tmp
local ASK_VOL_SIZE=1
local inst_grub_opt opt_confirm_ j2_switch_msg_1 j2_switch_msg_2 j2_switch_msg_3
vol_size_tmp="$(mktemp /tmp/vol_size_tmp.XXXXXX)"

if [ -z "$OCS_PARAM_TMP" ]; then
  echo "\"$OCS_PARAM_TMP\" was not assigned in function set_ocs_sr_extra_param"
  echo "$msg_program_stop!"
  exit 1
fi

if [ "$mode2_" = "recovery-iso-zip" ]; then
  # E.g., set_ocs_sr_extra_param restore /tmp/ocs_recovery_tmp.8YNkii recovery-iso-zip
  # When mode2_ is recovery-iso-zip, we have to convert it to restoreparts or restoredisk
  # by testing the image
  if [ -e "$ocsroot/$target_dir/disk" ]; then
    mode2_="restoredisk"
  else
    mode2_="restoreparts"
  fi
fi

# If the mode is only for parts, we won't turn on "-g auto" option by default
case "$mode2_" in
  *parts) inst_grub_opt="off"
	  # For restoreparts, forget about clean mbr
	  skip_clean_mbr_opt="on"
	  ;;
       *) inst_grub_opt="on"
	  # For restoredisk, do mbr cleaning
	  skip_clean_mbr_opt="off"
	  ;;
esac

if [ "$mode" = "restore" ]; then
  # Although -u/-y0/-y1 is shown in ocs-sr, but actually they are used to
  # pass the varialbe, and in this function, when chooing parameters, we
  # remove them on purpose. Since the necessay parameters will be assigned by
  # drbl-ocs (Ex: we use "-y1 -p choose" in drbl-ocs)
  if [ "$ocs_user_mode" = "expert" ]; then
    # The option "-j2" (clone_hidden_data) should be only shown when it's in restoredisk mode
    # Ref: https://sourceforge.net/p/clonezilla/bugs/361/
    case "$mode2_" in 
      restoreparts) 
	      j2_switch_msg_1="-j2"
	      j2_switch_msg_2="$(rep_whspc_w_udrsc "$msg_ocs_param_j2")"
	      j2_switch_msg_3="off"
	      ;;
      restoredisk)
	      j2_switch_msg_1="-j2"
	      j2_switch_msg_2="$(rep_whspc_w_udrsc "$msg_ocs_param_j2")"
	      j2_switch_msg_3="on"
	      ;;
    esac
    $DIA --separate-output --backtitle "$msg_nchc_free_software_labs" --title  \
    "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --checklist "$msg_choose_param_to_set_multiple_choices ($msg_press_space_to_mark_selection)" \
    0 0 0 $DIA_ESC \
    "-g auto"  "$msg_ocs_param_g_auto" $inst_grub_opt \
    "-e1 auto" "$msg_ocs_param_e1_auto" on \
    "-e2"      "$msg_ocs_param_e2" on \
    "-nogui"   "$msg_ocs_param_nogui" off \
    "-hn0 $WIN_HOSTNAME_PREFIX"  "$msg_ocs_param_hn0" off \
    "-hn1 $WIN_HOSTNAME_PREFIX"  "$msg_ocs_param_hn1" off \
    "-v"       "$msg_ocs_param_v" off \
    "-batch"   "$msg_ocs_param_b" off \
    "-c"       "$msg_ocs_param_c" on \
    "-t"       "$msg_ocs_param_t" $skip_clean_mbr_opt \
    "-t1"      "$msg_ocs_param_t1" off \
    "-t2"      "$msg_ocs_param_t2" off \
    "-r"       "$msg_ocs_param_r" off \
    "-rescue " "$msg_ocs_param_rescue" off \
    "-e"       "$msg_ocs_param_e" off \
    "-icrc"    "$msg_ocs_param_icrc" off \
    "-irhr"    "$msg_ocs_param_irhr" off \
    "-irvd"    "$msg_ocs_param_irvd" off \
    "-ius"     "$msg_ocs_param_ius" off \
    "-iui"     "$msg_ocs_param_iui" off \
    "-icds"    "$msg_ocs_param_icds" off \
    "-iefi"    "$msg_ocs_param_iefi" off \
    "-j1"      "$msg_ocs_param_j1" off \
    $j2_switch_msg_1 $j2_switch_msg_2 $j2_switch_msg_3 \
    "-cm"      "$msg_ocs_param_cm" off \
    "-cs"      "$msg_ocs_param_cs" off \
    "-cb2"      "$msg_ocs_param_cb2" off \
    "-cb3"      "$msg_ocs_param_cb3" off \
    "-cmf"     "$msg_ocs_param_cmf" off \
    "-a"       "$msg_ocs_param_a" off \
    "-o0"      "$msg_ocs_param_o0" off \
    "-o1"      "$msg_ocs_param_o1" off \
    "-srel"    "$msg_ocs_param_srel" off \
    "-ps"      "$msg_ocs_param_ps" off \
    "-edio"    "$msg_ocs_param_edio" on \
    "-rmtd"    "$msg_ocs_param_rmtd" off \
    "-rmmcb"   "$msg_ocs_param_rmmcb" off \
    "-reluks"  "$msg_ocs_param_reluks" off \
    2>> $OCS_PARAM_TMP
  else
    if [ "$ocs_batch_mode" != "on" ]; then
      # Interactive mode. We need to add "-c"
      opt_confirm_="-c"
    else
      # Batch mode. We do not add "-c"
      opt_confirm_=""
    fi
    # Beginner mode. Use default settings
    if [ "$inst_grub_opt" = "on" ]; then
      # restoredisk mode.
      # "$inst_grub_opt" = "on" (-g auto) means skip_clean_mbr_opt="off" (no -t)
      echo "-g auto" "-e1 auto" "-e2" "-r" "-j2" "-edio" "$opt_confirm_" >> $OCS_PARAM_TMP
    else
      # restoreparts mode.
      # "$inst_grub_opt" = "off" (no "-g auto") means skip_clean_mbr_opt="on" (-t)
      # Do not enable -j2 by default since for restoreparts, it should not be done by default.
      # Ref: https://sourceforge.net/p/clonezilla/bugs/361/
      echo "-e1 auto" "-e2" "-t" "-r" "-edio" "$opt_confirm_" >> $OCS_PARAM_TMP
    fi
  fi

  # About partition table
  case "$mode2_" in 
    "restoreparts") 
      # Partition restore only. default NOT to create partition table
      if [ "$ocs_user_mode" = "expert" ]; then
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_hint_for_fdisk \n$msg_choose_param_to_set_single_choice" \
        0 0 0 $DIA_ESC \
        "-k "      "$msg_ocs_param_k"  \
        "-k1 "     "$msg_ocs_param_k1"  \
        "-k2 "     "$msg_ocs_param_k2"  \
        "-j0 "     "$msg_ocs_param_j0" \
        "-k0 "     "$msg_use_the_part_table_from_image"  \
        "exit "    "$msg_exit" \
        2>> $OCS_PARAM_TMP
      else
        echo "-k " >> $OCS_PARAM_TMP
      fi
      ;;
    *)
      # Disk restore, default to create partition table
      if [ "$ocs_user_mode" = "expert" ]; then
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_hint_for_fdisk \n$msg_choose_param_to_set_single_choice" \
        0 0 0 $DIA_ESC \
        "-k0 "     "$msg_use_the_part_table_from_image"  \
        "-k "      "$msg_ocs_param_k"  \
        "-k1 "     "$msg_ocs_param_k1"  \
        "-k2 "     "$msg_ocs_param_k2"  \
        "-j0 "     "$msg_ocs_param_j0" \
        "exit "    "$msg_exit" \
        2>> $OCS_PARAM_TMP
      else
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" --menu "$msg_hint_for_fdisk_beginner \n$msg_choose_default_param_if_no_idea" \
        0 0 0 $DIA_ESC \
        "-k0 "     "$msg_use_the_part_table_from_image"  \
        "-k1 "     "$msg_ocs_param_k1"  \
        "exit "    "$msg_exit" \
        2>> $OCS_PARAM_TMP
      fi
      ;;
  esac
  if grep -Ew "exit" $OCS_PARAM_TMP &>/dev/null; then
    echo "$msg_program_stop"
    exit 1
  fi
  # Question about checking the image is restorable or not. By default, no matter it's beginner or advanced mode, 
  # we will ask.
  if [ -z "$chk_img_restoreable_mod_restore" ]; then
    $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
    "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_if_checking_image_restorable_before_restoring" \
    0 0 0 $DIA_ESC \
    " "     "$msg_ocs_param_check_img_restorable_before_restoring" \
    "-scr " "$msg_ocs_param_skip_checking_img_restorable_before_restoring" \
    2>> $OCS_PARAM_TMP
  else
    case "$chk_img_restoreable_mod_restore" in
      yes) echo " " >> $OCS_PARAM_TMP;;
       no) echo "-scr " >> $OCS_PARAM_TMP;;
    esac
  fi
  if LC_ALL=C grep -Ew -- "(-k1|-k2)" $OCS_PARAM_TMP &>/dev/null; then
    # Option -k1 or -k2 is for different partition size, turn on -r and -icds by default
    if [ -z "$(LC_ALL=C grep -Ew -- "-r" $OCS_PARAM_TMP)" ]; then
      echo "Since the mode you choose might resize partition size, we turn on file system resize funtion automatically (-r)..."
      echo "-r " >> $OCS_PARAM_TMP
    fi
    if [ -z "$(LC_ALL=C grep -Ew -- "-icds" $OCS_PARAM_TMP)" ]; then
      echo "Since the mode you choose might resize partition size, we now enable option \"-icds\" to ignore the partition size checking in Partclone..."
      echo "-icds " >> $OCS_PARAM_TMP
    fi
  fi
else
  # Save mode.
  # about -q, -q1, -q2
  if [ "$ocs_user_mode" = "expert" ]; then
    $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
    "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_param_for_clone_prog" \
    0 0 0 $DIA_ESC \
    "-q2 "       "$msg_ocs_param_q2" \
    "-q1 "       "$msg_ocs_param_q1" \
    "-q "        "$msg_ocs_param_q" \
    " "          "$msg_ocs_param_none_ie_partimage" \
    2>> $OCS_PARAM_TMP
  else
    echo "-q2 " >> $OCS_PARAM_TMP
  fi

  get_smtd_smmcb_switch  # Obtain smtd_smmcb_switch
  if [ "$ocs_user_mode" = "expert" ]; then
    $DIA --separate-output --backtitle "$msg_nchc_free_software_labs" --title  \
    "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --checklist "$msg_choose_param_to_set_multiple_choices ($msg_press_space_to_mark_selection):" \
    0 0 0 $DIA_ESC \
    "-c "       "$msg_ocs_param_c" on \
    "-j2 "      "$msg_ocs_param_j2" on \
    "-nogui "   "$msg_ocs_param_nogui" off \
    "-a "       "$msg_ocs_param_a" off \
    "-batch "    "$msg_ocs_param_b" off \
    "-rm-win-swap-hib " "$msg_ocs_param_rm_win_swap_hib" off \
    "-ntfs-ok " "$msg_ocs_param_ntfs_ok" off \
    "-rescue "  "$msg_ocs_param_rescue" off \
    "-gm "      "$msg_ocs_param_gm" off \
    "-gs "      "$msg_ocs_param_gs" off \
    "-gb2 "     "$msg_ocs_param_gb2" off \
    "-gb3 "     "$msg_ocs_param_gb3" off \
    "-gmf "     "$msg_ocs_param_gmf" off \
    "-noabo "   "$msg_ocs_param_noabo" off \
    "-ps "      "$msg_ocs_param_ps" off \
    "-scpt "    "$msg_ocs_param_scpt" off \
    "-sfs "     "$msg_ocs_param_sfs" off \
    "-edio "    "$msg_ocs_param_edio" on \
    "-smtd "    "$msg_ocs_param_smtd" $smtd_smmcb_switch \
    "-smmcb "   "$msg_ocs_param_smmcb" $smtd_smmcb_switch \
    2>> $OCS_PARAM_TMP
  else
      case "$smtd_smmcb_switch" in
         on) echo "-c " "-j2 " "-edio " "-smtd " "-smmcb " >> $OCS_PARAM_TMP;;
        off) echo "-c " "-j2 " "-edio " >> $OCS_PARAM_TMP;;
      esac
  fi
fi

# if -hn0|-hn1 is chosen, 
# (1). prompt the warning about ntfs-3g/nfsmount for ntfs is necessary
# (2). ask if the hostname prefix want to change
if grep -qE "\-hn[01]" $OCS_PARAM_TMP; then
  # part 1.
  $DIA --title "$msg_change_hostname_of_MS_WIN_on_the_fly" --clear \
       --msgbox "$msg_write_MS_WIN_is_necessary" 15 70

  # part 2.
  HNTMP="$(mktemp /tmp/winhn.XXXXXX)"
  $DIA --backtitle "$msg_nchc_free_software_labs" --title "$msg_nchc_clonezilla" \
  --inputbox "$msg_What_the_win_hostname_prefix ?" 0 0 "$WIN_HOSTNAME_PREFIX" 2> $HNTMP
  HN_PREFIX="$(cat $HNTMP)"
  if [ -z "$HN_PREFIX" ]; then
     echo "You did not specify the hostname prefix for MS windows! We use the default value in drbl-ocs.conf"
  else
     perl -pi -e "s|(-hn.*) $WIN_HOSTNAME_PREFIX|\$1 $HN_PREFIX|g" $OCS_PARAM_TMP
  fi
  [ -f "$HNTMP" ] && rm -f $HNTMP
fi

if [ "$mode" = "save" ]; then
  cpu_no="$(LC_ALL=C grep -iE "^processor" /proc/cpuinfo | wc -l)" 
  # Due to the extra space required after -z1p, we can NOT use variable like this:
  # if [ "$cpu_no" -gt 1 ]; then
  #   z1p_option_1="-z1p "
  #   z1p_option_2="$msg_ocs_param_z1p"
  # else
  #   z1p_option_1=""
  #   z1p_option_2=""
  # fi
  # $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
  # "$msg_clonezilla_advanced_extra_param" --menu "$msg_choose_one_compression_param_to_save" \
  # 0 0 0 $DIA_ESC \
  # "-z1 "            "$msg_ocs_param_z1" \
  # $z1p_option_1     $z1p_option_2 \
  # "-z2 "            "$msg_ocs_param_z2" \
  # "-z3 "            "$msg_ocs_param_z3" \
  # "-z0 "            "$msg_ocs_param_z0" \
  # 2>> $OCS_PARAM_TMP
  show_z4_or_above_menu_or_not
  if [ "$cpu_no" -gt 1 ]; then
    # Show -z1p
    if [ "$ocs_user_mode" = "expert" ]; then
      $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
      "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_one_compression_param_to_save" \
      --default-item "$ocs_z9p_option_1" \
      0 0 0 $DIA_ESC \
      "-z1p"           "$msg_ocs_param_z1p" \
      "-z1"            "$msg_ocs_param_z1" \
      "-z2p"           "$msg_ocs_param_z2p" \
      "-z2"            "$msg_ocs_param_z2" \
      "-z3"            "$msg_ocs_param_z3" \
      $ocs_z4_option_1  $ocs_z4_option_2 \
      $ocs_z5p_option_1 $ocs_z5p_option_2 \
      $ocs_z5_option_1  $ocs_z5_option_2 \
      $ocs_z6p_option_1 $ocs_z6p_option_2 \
      $ocs_z6_option_1  $ocs_z6_option_2 \
      $ocs_z7_option_1  $ocs_z7_option_2 \
      $ocs_z8_option_1  $ocs_z8_option_2 \
      $ocs_z8p_option_1 $ocs_z8p_option_2 \
      $ocs_z9_option_1  $ocs_z9_option_2 \
      $ocs_z9p_option_1 $ocs_z9p_option_2 \
      "-z0"            "$msg_ocs_param_z0" \
      2>> $OCS_PARAM_TMP
      # We need to append a space after this parameter so it won't be connected to next parameter.
      echo -n " " >> $OCS_PARAM_TMP
    else
      # Beginner mode.
      # Question about -z1p and -z9p.
      if [ -n "$ocs_z9p_option_1" -a -n "$ocs_z9p_option_2" ]; then
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_one_compression_param_to_save" \
	--default-item "$ocs_z9p_option_1" \
        0 0 0 $DIA_ESC \
        "-z1p"              "$msg_ocs_param_z1p" \
        $ocs_z9p_option_1   $ocs_z9p_option_2 \
        2>> $OCS_PARAM_TMP
        # We need to append a space after this parameter so it won't be connected to next parameter.
        echo -n " " >> $OCS_PARAM_TMP
      else
        echo "-z1p " >> $OCS_PARAM_TMP
      fi
    fi
  else
    # Single processor, so we hide -z1p, z2p...
    if [ "$ocs_user_mode" = "expert" ]; then
      $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
      "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_one_compression_param_to_save" \
      0 0 0 $DIA_ESC \
      "-z1"            "$msg_ocs_param_z1" \
      "-z2"            "$msg_ocs_param_z2" \
      "-z3"            "$msg_ocs_param_z3" \
      $ocs_z4_option_1  $ocs_z4_option_2 \
      $ocs_z5_option_1  $ocs_z5_option_2 \
      $ocs_z6_option_1  $ocs_z6_option_2 \
      $ocs_z7_option_1  $ocs_z7_option_2 \
      $ocs_z8_option_1  $ocs_z8_option_2 \
      $ocs_z9_option_1  $ocs_z9_option_2 \
      "-z0"            "$msg_ocs_param_z0" \
      2>> $OCS_PARAM_TMP
      # We need to append a space after this parameter so it won't be connected to next parameter.
      echo -n " " >> $OCS_PARAM_TMP
    else
      # Beginner mode.
      # Question about -z1 and -z9.
      if [ -n "$ocs_z9_option_1" -a -n "$ocs_z9_option_2" ]; then
        $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
        "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_one_compression_param_to_save" \
	--default-item "$ocs_z9_option_1" \
        0 0 0 $DIA_ESC \
        "-z1"              "$msg_ocs_param_z1" \
        $ocs_z9_option_1   $ocs_z9_option_2 \
        2>> $OCS_PARAM_TMP
        # We need to append a space after this parameter so it won't be connected to next parameter.
        echo -n " " >> $OCS_PARAM_TMP
      else
        echo "-z1 " >> $OCS_PARAM_TMP
      fi
    fi
  fi

  # About image volume size
  if [ "$ocs_user_mode" = "expert" ]; then
    trap "[ -f "$vol_size_tmp" ] && rm -f $vol_size_tmp" HUP INT QUIT TERM EXIT
    while [ "$ASK_VOL_SIZE" -ne 0 ]; do
      $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
      "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --inputbox "$msg_set_image_volume_size" \
      0 0 $VOL_LIMIT_IN_INTERACTIVE\
      2> $vol_size_tmp
      if [ -n "$(cat $vol_size_tmp | grep -iE "[^[:digit:]]")" ]; then
        ASK_VOL_SIZE=1
        $DIA --backtitle "$msg_nchc_free_software_labs" --title "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" \
        --msgbox "$msg_enter_digits_only\n$msg_please_do_it_again!!!" 0 0 
      else
        ASK_VOL_SIZE=0
      fi
    done
    echo "-i $(cat $vol_size_tmp)" >> $OCS_PARAM_TMP
  else
    echo "-i $VOL_LIMIT_IN_INTERACTIVE" >> $OCS_PARAM_TMP
  fi
  # Question about fsck the source partition. By default, no matter it's beginner or advanced mode, we will ask.
  if [ -z "$fsck_src_part_intr" -a -z "$fsck_src_part_auto" ]; then
    $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
    "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_if_fsck_the_source_part" \
    0 0 0 $DIA_ESC \
    "-sfsck "  "$msg_skip_check_source_fs" \
    "-fsck "   "$msg_ocs_param_fsck_src_part" \
    "-fsck-y " "$msg_ocs_param_fsck_src_part_yes" \
    2>> $OCS_PARAM_TMP
  else
    case "$fsck_src_part_intr" in
      yes) echo "-fsck " >> $OCS_PARAM_TMP;;
        *) echo " " >> $OCS_PARAM_TMP;;
    esac
    case "$fsck_src_part_auto" in
      yes) echo "-fsck-y " >> $OCS_PARAM_TMP;;
        *) echo " " >> $OCS_PARAM_TMP;;
    esac
  fi
  
  # Question about checking the image is restorable or not. By default, no matter it's beginner or advanced mode, 
  # we will ask.
  if [ -z "$chk_img_restoreable_mod_save" ]; then
    $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
    "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" --menu "$msg_choose_if_checking_image_restorable" \
    0 0 0 $DIA_ESC \
    " "     "$msg_ocs_param_check_img_restorable" \
    "-scs " "$msg_ocs_param_skip_checking_img_restorable" \
    2>> $OCS_PARAM_TMP
  else
    case "$chk_img_restoreable_mod_save" in
      yes) echo " " >> $OCS_PARAM_TMP;;
       no) echo "-scs " >> $OCS_PARAM_TMP;;
    esac
  fi

  # Question about encrypt the image. By default, no matter it's beginner or advanced mode, 
  # we will ask. However, for some customized case, it it could be set via parameter encrypt_ocs_img.
  # encrypt_ocs_img is from /etc/ocs/ocs-live.conf
  if [ -z "$encrypt_ocs_img" ]; then
    $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
    "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" --menu "$msg_encrypt_image\n$msg_ecryptfs_is_used_for_clonezilla\n$msg_remember_passphrase_of_ecryptfs" \
    0 0 0 $DIA_ESC \
    "-senc "    "$msg_not_to_encrypt_img" \
    "-enc "     "$msg_yes_to_encrypt_img" \
    2>> $OCS_PARAM_TMP
  else
    case "$encrypt_ocs_img" in
      yes) echo "-enc " >> $OCS_PARAM_TMP;;
       no) echo "-senc " >> $OCS_PARAM_TMP;;
    esac
  fi
fi

# Question about copy the log files to Clonezilla live USB drive. By default, no matter it's beginner or advanced mode, 
if [ -z "$put_log_usb" ]; then
  $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
  "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" --menu "$msg_put_log_usb_or_not \n$msg_choose_default_param_if_no_idea" \
  0 0 0 $DIA_ESC \
  "-plu "    "$msg_put_log_to_OCS_USB_drive" \
  " "        "$msg_not_put_log_to_OCS_USB_drive" \
  2>> $OCS_PARAM_TMP
else
  case "$put_log_usb" in
    yes) echo "-plu " >> $OCS_PARAM_TMP;;
     no) echo " " >> $OCS_PARAM_TMP;;
  esac
fi

# For both beginner and expert modes, if user has specified postaction, then we do not have to set it. Otherwise, ask it.
if [ -n "$postaction" ]; then
  echo "-p $postaction " >> $OCS_PARAM_TMP
else
  ocs_sr_param_postaction_after_clone $OCS_PARAM_TMP
fi

# Force to strip the unnecessary quotation ', this is specially for dialog (from cdialog) in Mandriva and same reason to strip the unnecessary double quotation ", this is sepcially for dialog in OpenSuSE 11.1. Otherwise it will cause -p reboot become (containing space) '-p reboot', which is wrong option in dcs.
LC_ALL=C perl -pi -e "s/\'//g" $OCS_PARAM_TMP
LC_ALL=C perl -pi -e "s/\"//g" $OCS_PARAM_TMP
#
[ -e "$vol_size_tmp" ] && rm -f $vol_size_tmp

} # end of set_ocs_sr_extra_param
#
check_DIA_set_ESC(){
  # function to check dialog/Xdialog/whiptail
  # DIA_ESC is global variable, 
  # man dialog:
  # A "--" by itself is used as an escape, i.e., the next token on the com-
  # mand-line is not treated as an option.
  # dialog --title -- --Not an option
  # 3 cases if those Not an option is like (-g auto, -x...):
  # (1) dialog can go with or without --
  # (2) Xdialog can NOT go with --
  # (3) whiptail can go only with --
  local dia_="$1"
  # check DIA
  if ! type $dia_ &>/dev/null; then
     [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
     echo "$dia_: command not found!"
     [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
     echo "Program terminated!!!"
     exit 1
  fi
  case "$dia_" in
    dialog|[Xgk]dialog) DIA_ESC="" ;;
    whiptail) DIA_ESC="--" ;;
  esac
} # end of check_DIA_set_ESC
#
check_if_run_in_drbl_server() {
  local prog="$1"
  # check if it s run in drbl server
  if [ ! -d "$PXELINUX_DIR" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "[$LOGNAME] You should run this program $prog in DRBL server, NOT in DRBL client or other machine."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "Program terminated!"
    exit 1
  fi
}
dialog_like_prog_help_prompt() {
   echo " -d0, --dialog         Use dialog"
   echo " -d1, --Xdialog        Use Xdialog"
   echo " -d2, --whiptail       Use whiptail"
   echo " -d3, --gdialog        Use gdialog"
   echo " -d4, --kdialog        Use kdialog"
}
root_over_nfs() {
  local root_over_nfs
  root_over_nfs="$(grep -Ew "^[[:space:]]*([[:digit:]]+\.){3}[[:digit:]]+:/tftpboot/node_root([[:space:]]+|$)" /proc/mounts | awk -F " " '{print $2}')"
  if [ "$root_over_nfs" = "/" ]; then
    echo "yes"
    rc=0
  else
    echo "no"
    rc=1
  fi
  return $rc
}
#
make_random_password(){ 
  # Copyright (C) 2007 Bryan McLellan <btm@loftninjas.org>
  # Licensed under the GNU GPL version 2 or greater, see COPYING
  # generate a random password of length passed out of characters in array char. returns password in $random_password
  # replaces external perl password generation script
  # Modified by Steven Shiau, remove 0, 1, add [ ] ^ ! $ %
  local randchar=""
  [ -z "$1" ] && lenpass=6 || lenpass=$1

  # To avoid confusing, no 0, 1 for passwd, the O (oh) and l (L) will be clear. 
  char=(A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z 2 3 4 5 6 7 8 9 \[ \] ^ ! \$ %)
  lenchars=${#char[*]}

  for (( x=0 ; x<${lenpass} ; x+=1 ));
  do
    let rand=${RANDOM}%${lenchars}
    randchar=${randchar}${char[$rand]}
  done

  random_password=${randchar}
}
#
is_boot_from_live() {
  # function to check if the running OS is boot from live cd/usb stick ?
  if [ -e /etc/debian_version -a \
       -n "$(grep -iEo "(boot=casper|boot=live)" /proc/cmdline)" ]; then
     return 0
  else
     return 1
  fi
}
#
ask_nic_dev() {
  # chosen_nics is a global variable
  local dia_type req_nic_no dia_prompt nic_tmp
  local nic_no dia_def_status NETDEVICES count hw_scan_tmp DEVICELIST dev_model link_status hwaddr DEVICELIST read_cache
  local enable_channel_bonding="no"
  # link_max_cache_sec is from drbl-ocs.conf
  # The file name prefix for link status file. It will be used like /tmp/linked-status.eth0
  # ocs_nic_type is a global variable
  local link_status_cache_pref="/tmp/linked-status"

  while [ $# -gt 0 ]; do
    case "$1" in
      -e|--enable-channel-bonding)
           enable_channel_bonding="yes"
           shift;;
      -*)  echo "${0}: ${1}: invalid option in ask_nic_dev." | tee --append ${OCS_LOGFILE} >&2
           echo "$msg_program_stop" | tee --append ${OCS_LOGFILE}
           [ "$save_restore_error_log" = "yes" ] && copy_error_log
           exit 2 ;;
       *)  break ;;
    esac
  done

  dia_prompt="$1"
  dia_type="$2"
  req_nic_no="$3"
  nic_tmp="$(mktemp /tmp/netbonding.XXXXXX)"
  trap "[ -f "$nic_tmp" ] && rm -f $nic_tmp" HUP INT QUIT TERM EXIT
  
  case "$dia_type" in
    menu)      dia_def_status="";;
    checklist) dia_def_status="on";;
  esac

  # ocs_nic_type is from:
  # (1) boot parameter, hence in /etc/ocs/ocs-live.conf
  # (2) assigned by ocs-live-netcfg
  case "$ocs_nic_type" in
    wired)
      NETDEVICES="$(grep -E "^[[:print:]]+:[[:space:]]+" /proc/net/dev | awk -F: '! /wlan.*:|wl.*:|lo:/{print $1}' | sort)"
      ;;
    wireless)
      NETDEVICES="$(awk -F: '/wlan.*:|wl.*:/{print $1}' /proc/net/dev | sort)"
      ;;
    *)
      echo "ocs_nic_type is not wired or wireless. No idea how to process."
      echo "$msg_program_stop!"
      my_ocs_exit 1
      ;;
  esac
  # make it in a single line
  NETDEVICES="$(echo $NETDEVICES)"
  nic_no="$(echo $NETDEVICES | wc -w)"
  if [ "$nic_no" -lt "$req_nic_no" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "The requested NIC number is: $req_nic_no, while the NIC number on this system is: $nic_no"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    show_nic_dev_status_on_system
    echo "$msg_program_stop!"
    my_ocs_exit 1
  fi
  # Check if it makes sense when channel bonding is enabled
  if [ "$enable_channel_bonding" = "yes" ]; then
    if [ "$nic_no" -lt 2 ]; then
      echo "Disable channnel bonding since there is only one NIC found."
      enable_channel_bonding="no"
    fi
  fi
  
  if [ -z "$NETDEVICES" ]; then
    $DIA --msgbox "$msg_no_nic_is_found" 0 0
    if [ -n "$nic_tmp" ]; then
      rm -f "$nic_tmp"
    fi
    exit 1
  else
    # We have to up the network card first so that ethtool can detect if it's linked or not.
    echo -n "Try to up "
    for DEVICE in $NETDEVICES; do
      if [ -z "$(drbl-get-ipadd $DEVICE)" ]; then
        echo -n "$DEVICE... "
	ip link set $DEVICE up
      fi
    done
    echo
  fi
  
  count="$(echo "$NETDEVICES" | wc -w)"
  
  if [ "$count" -gt 1 ]; then
    hw_scan_tmp="$(mktemp /tmp/hw_scan.XXXXXX)"
    time_now="$(LC_ALL=C date +%s)"
    # Read the cached linked status from file.
    if type lshw &>/dev/null; then
      echo -n "Collecting the info of network devices... "
      lshw -businfo -class network 2>/dev/null > $hw_scan_tmp
      echo "done!"
    fi
    DEVICELIST=""
    dev_model=""
    for DEVICE in $NETDEVICES; do
      dev_model="$(LC_ALL=C grep -Ew "$DEVICE" $hw_scan_tmp | sed -e "s/^.*$DEVICE[[:space:]]*network[[:space:]]*//g" | sed -e "s/ /_/g")"
      [ -z "$dev_model" ] && dev_model="Unknown_NIC"
      # only first 26 characters.
      dev_model="${dev_model:0:25}.."
      link_status=""
      read_cache=""
      if [ -e "${link_status_cache_pref}.${DEVICE}" ]; then
        time_status_file="$(LC_ALL=C stat -c %Z "${link_status_cache_pref}.${DEVICE}")"
	if [ "$((time_now - time_status_file))" -le "$link_max_cache_sec" ]; then
         read_cache="yes"
        fi
      fi
      if [ "$read_cache" = "yes" ]; then
        echo "Reading link status from cache file ${link_status_cache_pref}.${DEVICE}..."
        . ${link_status_cache_pref}.${DEVICE}
      else
	if [ -n "$(echo $DEVICE | grep -Ew "(^wl.*|^wlan.*)")" ]; then
          echo "$DEVICE is a wireless device. No need to detect its linking status."
        else
          echo -n "Getting the linking status of $DEVICE. Timeout in $ocs_netlink_timeout secs."
          TIMEOUT="$ocs_netlink_timeout"
          while [ "$link_status" = "no" -o -z "$link_status" ]; do
            sleep 1
            link_status="$(LC_ALL=C ethtool $DEVICE | grep -i "Link detected:" | cut -d":" -f2 | sed -e "s/ //g")"
            TIMEOUT="$(( $TIMEOUT - 1 ))"
            if [ "$TIMEOUT" -le 0 ]; then
              echo
              echo -n "Timeout when finding linking status of $DEVICE."
    	  sleep 2
              break
            else
              echo -n "."
            fi
          done
        fi
        if [ "$link_status" = "yes" ]; then
          echo " Found status \"linked\"."
        else
          echo " Status \"not linked\" or \"unknown\"."
        fi
        if [ -z "$link_status" ]; then
          link_status="Unknown"     
        fi
	echo "link_status=\"${link_status}\"" > ${link_status_cache_pref}.${DEVICE}
      fi
      hwaddr="$(drbl-get-macadd $DEVICE)"
      DEVICELIST="$DEVICELIST ${DEVICE} $(rep_whspc_w_udrsc "$msg_link_detected"):${link_status}(${dev_model}|${hwaddr}) $dia_def_status"
    done
    rm -f "$nic_tmp"
    [ -f "$hw_scan_tmp" -a -n "$hw_scan_tmp" ] && rm -f $hw_scan_tmp

    if [ "$enable_channel_bonding" = "yes" ]; then
      DEVICELIST="$DEVICELIST bond0 $(rep_whspc_w_udrsc "$msg_use_channel_bonding") $dia_def_status"
    fi

    $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
    "$msg_nchc_clonezilla" --${dia_type} "$dia_prompt" 0 0 0 $DEVICELIST 2>"$nic_tmp"
    # Force to strip the unnecessary quotation ', this is specially for dialog (from cdialog) in Mandriva and same reason to strip the unnecessary double quotation ", this is sepcially for dialog in OpenSuSE 11.1. Otherwise it will cause -p reboot become (containing space) '-p reboot', which is wrong option in dcs.
    LC_ALL=C perl -pi -e "s/\'//g" $nic_tmp
    LC_ALL=C perl -pi -e "s/\"//g" $nic_tmp
    chosen_nics="$(cat $nic_tmp)"
  else
    # Only 1 NIC, just use it.
    # Remove additional spaces
    chosen_nics="$(echo $NETDEVICES)"
  fi
  
  if [ -n "$nic_tmp" ]; then
    rm -f "$nic_tmp"
  fi
} # end of ask_nic_dev
#
detect_dhcp_srv_in_lan() {
  # Return global variable "use_existing_dhcp_srv", "DHCPOFFER_eth", "DHCPOFFER_siaddr",
  # "DHCPOFFER_yiaddr", "DHCPOFFER_netmask", "DHCPOFFER_prefix"
  local nic_n eth_pt dhcp_detect_bond_tmp dhcp_find_rc
  nic_n="$(LC_ALL=C get-nic-devs | wc -l)"
  if [ "$nic_n" -eq 0 ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "No any ethernet card found!"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "$msg_program_stop"
    exit 1
  elif [ "$nic_n" -eq 1 ]; then
    eth_pt="$(LC_ALL=C get-nic-devs)"
  else
    # Multiple NICs, let user choose
    [ -z "$ocs_nic_type" ] && ocs_nic_type="wired"
    [ -z "$ocs_netlink_timeout" ] && ocs_netlink_timeout="12"
    ask_nic_dev -e "$msg_choose_nic?" menu 1 # Obtain $chosen_nics
    if [ -n "$chosen_nics" ]; then
      echo "Chosen NIC: $chosen_nics"
      eth_pt="$chosen_nics"
    fi
  fi
  dhcp_detect_bond_tmp="$(mktemp /tmp/dhcp_detect_bond_tmp.XXXXXX)"
  dhcp_find_rc=1
  echo "Trying to find if existing DHCP service available on local network via ${eth_pt}..."
  while [ "$dhcp_find_rc" -ne 0 ]; do
    drbl-find-dhcp-srv -i $eth_pt $dhcp_detect_bond_tmp
    dhcp_find_rc=$?
    if [ "$dhcp_find_rc" -ne 0 ]; then
      echo
      echo "$msg_failed_to_find_any_dhcp_srv: $eth_pt"
      echo "$msg_do_u_want_to_do_it_again"
      echo -n "[Y/n] "
      read try_dhcp_again
      case "$try_dhcp_again" in
        n|N|[nN][oO])
           echo "$msg_program_stop"
           dhcp_find_rc=0
           ;;
        *)
           echo "$msg_ok_let_do_it"
           dhcp_find_rc=1
           ;;
      esac
    fi
  done
  . $dhcp_detect_bond_tmp
  # Example for file dhcp_detect_bond_tmp:
  # DHCPOFFER_eth="eth0"
  # DHCPOFFER_siaddr="192.168.22.254"
  # DHCPOFFER_yiaddr="192.168.22.3"
  # DHCPOFFER_netmask="255.255.255.0"
  # DHCPOFFER_prefix="24"
  rm -f $dhcp_detect_bond_tmp
  if [ -n "$DHCPOFFER_siaddr" ]; then
    echo $msg_delimiter_star_line
    echo "$msg_found_dhcp_service_on_nic: $DHCPOFFER_eth"
    echo "$msg_do_you_want_to_lease_ip_addr_from_existing_dhcp_srv: $DHCPOFFER_siaddr"
    echo "$msg_will_use_available_ip_addr_from_dhcp_srv"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "$msg_note_you_have_to_make_sure_enough_no_of_ip_addr"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo -n "[Y/n] "
    read use_existing_dhcp_srv_ans
    case "$use_existing_dhcp_srv_ans" in
       n|N|[nN][oO]) use_existing_dhcp_srv="no" ;;
       *) use_existing_dhcp_srv="yes" ;;
    esac
  fi
} # end of detect_dhcp_srv_in_lan
#
config_drbl_live_network(){
  local eth_port_no configured_ip_no eth_port configured_port_list configured_ip_no 
  local IP_no dhcp_detect_bond_tmp DHCPOFFER_netmask DHCPOFFER_prefix dhcp_find_rc
  local run_net_cfg try_dhcp_again manually_configure_ans
  # This function only works for Debian based network setting.
  # drbl_live_private_IP_alias_eth_def is global variable from drbl.conf.
  echo "Detecting the network status..."
  eth_port_no="$(LC_ALL=C get-nic-devs | wc -l)"
  configured_ip_no="$(LC_ALL=C get-all-nic-ip -i | wc -w)"
  while [ "$configured_ip_no" -lt "$eth_port_no" ]; do
    [ -n "$(LC_ALL=C route -n | grep -E "^0.0.0.0")" ] && config_gw_opt="--ignore-gw"
    [ -n "$(LC_ALL=C grep -E "^[[:space:]]*nameserver[[:space:]]+\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b" /etc/resolv.conf 2>/dev/null)" ] && config_dns_opt="--ignore-dns"
    # find the configured ports, we will exclude them.
    eth_port="$(LC_ALL=C get-nic-devs)"
    configured_port_list=""
    for i in $eth_port; do
      if [ -n "$(LC_ALL=C drbl-get-ipadd $i)" ]; then
       configured_port_list="$configured_port_list $i"
      fi
    done
    echo "The ethernet port(s) already configured: $configured_port_list"
    if [ -n "$configured_port_list" ]; then
      ocs-live-netcfg --ip-add " " $config_gw_opt $config_dns_opt --ignore-dv "$configured_port_list"
    else
      ocs-live-netcfg --ip-add " " $config_gw_opt $config_dns_opt
    fi
    configured_ip_no="$(get-all-nic-ip -i | wc -w)"
    [ "$configured_ip_no" -eq "$eth_port_no" ] && break
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo $msg_do_not_assign_default_gw_for_DRBL_NIC
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "$msg_continue_to_conf_another_NIC"
    echo -n "[Y/n] "
    read continue_conf_eth
    case "$continue_conf_eth" in
       n|N|[nN][oO]) break ;;
    esac
  done

  IP_no="$(get-all-nic-ip -i | wc -w)"
  if [ "$IP_no" -eq 0 ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo $msg_no_ip_address_is_configured
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "$msg_program_stop"
    exit 1
  fi
  if [ "$IP_no" -eq 1 ]; then
    echo $msg_delimiter_star_line
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "Only one network interface was found and configured."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    detect_dhcp_srv_in_lan  # Get use_existing_dhcp_srv and DHCPOFFER_eth
    eth_port="$DHCPOFFER_eth"

    if [ "$use_existing_dhcp_srv" = "yes" ]; then
      # Add a virtual network device on physical net device
      drbl-add-vir-netdev $eth_port drbl0
      echo "Leasing IP address for virtual device drbl0..."
      dhcp_detect_vir_tmp="$(mktemp /tmp/dhcp_detect_vir_tmp.XXXXXX)"
      dhcp_find_rc=1
      while [ "$dhcp_find_rc" -ne 0 ]; do
        drbl-find-dhcp-srv -i drbl0 $dhcp_detect_vir_tmp
        dhcp_find_rc=$?
        if [ "$dhcp_find_rc" -ne 0 ]; then
          echo
          echo "$msg_failed_to_find_any_dhcp_srv: drbl0"
          echo "$msg_do_u_want_to_do_it_again"
	  echo "$msg_say_no_to_manually_config_it"
          echo -n "[Y/n] "
          read try_dhcp_again
          case "$try_dhcp_again" in
            n|N|[nN][oO])
               echo $msg_delimiter_star_line
               echo -n "$msg_do_you_want_to_manually_configure_it? (Y/n) " 
               read manually_configure_ans
               case "$manually_configure_ans" in
                    n|N|[nN][oO])
                       echo "$msg_program_stop"
                       dhcp_find_rc=0
                       # Saving mode, always copy error log to image dir.
                       copy_error_log
                       exit 1
                       ;;
                    *)
                       run_net_cfg="yes"
                       while [ "$run_net_cfg" = "yes" ]; do
                         echo $msg_delimiter_star_line
                         echo "$msg_what_is_the_ip_add_for_virtual_nic_drbl0"
                         read drbl0_ip_prefix
                         echo "$msg_your_input_config_is: $drbl0_ip_prefix"
                         echo -n "$msg_is_that_correct (Y/n) " 
			 read input_check_ans
		         case "$input_check_ans" in
                           n|N|[nN][oO]) run_net_cfg="yes"  ;;
		                      *) run_net_cfg="no" ;;
		         esac
		       done
		       # Write to file     
		       drbl0_ip="$(echo $drbl0_ip_prefix | awk -F"/" '{print $1}')"
		       drbl0_prefix="$(echo $drbl0_ip_prefix | awk -F"/" '{print $2}')"
        	       cat <<-DHCP_END > $dhcp_detect_vir_tmp
DHCPOFFER_eth="drbl0"
DHCPOFFER_siaddr=""
DHCPOFFER_yiaddr="$drbl0_ip"
DHCPOFFER_netmask=""
DHCPOFFER_prefix="$drbl0_prefix"
DHCP_END
                       dhcp_find_rc=0
                       ;;
               esac
               ;;
            *)
               echo "$msg_ok_let_do_it"
               dhcp_find_rc=1
               ;;
          esac
        fi
      done
      # Reset variables before loading them.
      DHCPOFFER_eth=""
      DHCPOFFER_siaddr=""
      DHCPOFFER_yiaddr=""
      DHCPOFFER_netmask=""
      DHCPOFFER_prefix=""
      . $dhcp_detect_vir_tmp
      # Instead of using "dhclient -v drbl0" which will set routing table, we do not want. Here we use static address without routing table.
      if [ -n "$DHCPOFFER_yiaddr" ]; then
        if [ -z "$DHCPOFFER_prefix" ]; then
          # Since check_dhcp does not provide netmask/inet prefix length info, borrow it from bond card's info
	  # ip command only accepts prefix length, not netmask. E.g.
	  # 2: eth0    inet 192.168.76.254/24 brd 192.168.76.255 scope global eth0...
	  DHCPOFFER_prefix="$(LC_ALL=C ip -o -f inet addr show $eth_port | awk -F" " '{print $4}' | awk -F"/" '{print $2}')"
        fi
        ip addr add $DHCPOFFER_yiaddr/$DHCPOFFER_prefix dev drbl0
      else
        [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
        echo "Failed to lease DHCP IP address for network interface drbl0!"
        [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
        echo "$msg_program_stop!"
        my_ocs_exit 1
      fi
      # Write result for later use in drblpush.
      if grep -Eq "^use_existing_dhcp_srv=.*" /etc/drbl/drbl.conf; then
        perl -pi -e "s/^use_existing_dhcp_srv=.*/use_existing_dhcp_srv=yes # Modified by drbl-live/g" /etc/drbl/drbl.conf
      else
        echo "use_existing_dhcp_srv=yes # Modified by drbl-live" >> /etc/drbl/drbl.conf
      fi
      rm -f $dhcp_detect_vir_tmp
    elif [ "$use_existing_dhcp_srv" = "no" ]; then
      # Write result for later use in drblpush.
      if grep -Eq "^use_existing_dhcp_srv=.*" /etc/drbl/drbl.conf; then
        perl -pi -e "s/^use_existing_dhcp_srv=.*/use_existing_dhcp_srv=no # Modified by drbl-live/g" /etc/drbl/drbl.conf
      else
        echo "use_existing_dhcp_srv=no # Modified by drbl-live" >> /etc/drbl/drbl.conf
      fi
      if [ -z "$limit_pxe_drbl_client" ]; then
        [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
        echo "$msg_one_NIC_one_IP_limitation_prompt"
        echo "$msg_if_lease_IP_add_to_pxe_etherboot_only"
        [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
        echo -n "[Y/n] "
        read limit_pxe_drbl_client_ans
        case "$limit_pxe_drbl_client_ans" in
           n|N|[nN][oO]) limit_pxe_drbl_client="no" ;;
           *) limit_pxe_drbl_client="yes" ;;
        esac
      else
        case "$limit_pxe_drbl_client" in
           n|N|[nN][oO]|y|Y|[yY][eE][sS]) true ;;
           *) 
              [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
              echo "\"$limit_pxe_drbl_client\" is an unknown or unsupported option for limit_pxe_drbl_client."
              [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
              echo "$msg_program_stop"
              exit 1
              ;;
        esac
      fi
      echo -n "$msg_only_one_IP_so_create_alias_IP "
      alias_done="no"
      # Get the NIC device name for the only one device
      nic_dev_only="$(get-nic-devs | head -n 1)"
      i="$drbl_live_private_IP_alias_eth_def"
      while [ "$alias_done" = "no" ]; do
        if ! ping -c 3 192.168.$i.254 &>/dev/null; then
          ifconfig ${nic_dev_only}:1 192.168.$i.254 netmask 255.255.255.0
          alias_done="yes"
        else
          i=$((i+1))
        fi
      done
      if ! grep -E -e "^auto[[:space:]]+${nic_dev_only}:1" /etc/network/interfaces; then
        cat <<-NET_END >> /etc/network/interfaces
auto ${nic_dev_only}:1
iface ${nic_dev_only}:1 inet static
	address 192.168.$i.254
	netmask 255.255.255.0
NET_END
      fi
    fi

    echo "$msg_done!"
  else
    # More than one IP address, so it's not necessary to use alias IP address.
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo $msg_more_than_1_IP_some_for_DRBL_clients
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  fi

  if [ -z "$(LC_ALL=C route -n | grep -E "^0.0.0.0")" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "No default gateway was configured! Did you enter it or the input gateway is the correct one ?"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "The routing table:"
    echo "---------------------------------------------------------"
    LC_ALL=C route -n
    echo "---------------------------------------------------------"
    echo "$msg_program_stop"
    exit 1
  fi
} # end of config_drbl_live_network
#
get_existing_language(){
   # show existing language file
   local ANS_TMP=$1
   local rec_lang=
   local lang_shown
   local TMP=`mktemp /tmp/ocs.XXXXXX`
   trap "[ -f "$TMP" ] && rm -f $TMP" HUP INT QUIT TERM EXIT
   numfiles=`LC_ALL=C ls $DRBL_SCRIPT_PATH/lang/bash/*.UTF-8 2> /dev/null | wc -l`
   numfiles=`LC_ALL=C expr $numfiles + 0`
   # list the previous saved images
   # the list of images can be put in one page
   filelist=""
   numfiles=0
   for file in $DRBL_SCRIPT_PATH/lang/bash/*.UTF-8; do
     fileinfo="$(basename $file)"
     fileinfo_="$(echo $fileinfo | sed -e "s/\.UTF-8//g")"
     # Convert to human can read, i.e. show "English" instead of "en_US"
     eval lang_shown=\$msg_locale_${fileinfo_}
     # Replace the space with "-" so that dialog won't fail.
     lang_shown="$(LC_ALL=C echo $lang_shown | sed -r -e "s/[[:space:]]/_/g")"
     if [ -n "$lang_shown" ]; then
       filelist="$filelist $fileinfo $lang_shown"
     else
       filelist="$filelist $fileinfo $fileinfo_"
     fi
     numfiles=`LC_ALL=C expr $numfiles + 1`
   done
   # Find the system lang setting "ocs_lang"
   [ -e "/etc/ocs/ocs-live.conf" ] && . /etc/ocs/ocs-live.conf
   if [ -n "$ocs_lang" ]; then
     preferred_lang_opt="--default-item $ocs_lang"
   fi

   if [ "$numfiles" -gt 0 ]; then
     if [ "$numfiles" -lt "$MAX_DIALOG_HEIGHT" ]; then
       height="$numfiles"
     else
       height="$MAX_DIALOG_HEIGHT"
     fi
     $DIA \
       --backtitle "$msg_nchc_free_software_labs" \
       --title "$msg_nchc_clonezilla | $msg_mode: $ocs_mode_prompt" \
       $preferred_lang_opt \
       --menu "$msg_choose_the_language_in_recovery_iso_zip:" 0 0 \
       $height $filelist 2> $TMP
     rec_lang="$(cat $TMP)"
   else
     [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
     echo "No lanaguage file was found! $msg_program_stop!!!"
     [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
     exit 1
   fi
   [ -f "$TMP" ] && rm -f $TMP
   # return the valule
   echo $rec_lang > $ANS_TMP
} # end of get_existing_language
#
gen_locale_if_not_found() {
  local lang_region_tmp="$1"
  local lang_tmp="$2"
  # Generate locale files.
  # The outputs for localedef --list-archive are like:
  # en_US.utf8
  # zh_TW.utf8
  # While we use en_US.UTF-8 or zh_TW.UTF-8 as the locale.
  # If it's not a archive, the locales will be saved as the name of a subdirectory in /usr/lib/locale where per-category compiled files are placed.
  [ -z "$lang_region_tmp" ] && echo "You should assign lang_region_tmp in function gen_locale_if_not_found!!!" && exit 1
  [ -z "$lang_tmp" ] && echo "You should assign lang_tmp in function gen_locale_if_not_found!!!" && exit 1
  if [ -z "$(localedef --list-archive | sed -e 's|\.utf8|.UTF-8|g' | grep -iw "$lang_tmp")" ] && \
     [ -z "$(unalias ls 2>/dev/null; ls /usr/lib/locale 2>/dev/null | sed -e 's|\.utf8|.UTF-8|g' | grep -iw "$lang_tmp")" ]
  then 
    echo -n "Generating locale $lang_tmp by: localedef -f UTF-8 -i $lang_region_tmp $lang_tmp... "
    localedef -f UTF-8 -i $lang_region_tmp $lang_tmp
    echo "done!"
  fi
} # end of gen_locale_if_not_found
#
parse_cmdline_option() {
  # The reason we have this function is some boot parameter is like xxx="-k -x", therefore we can not just use 
  # case $param in
  # xxx=*) ...
  # method, since it won't catch the right xxx. It will just catch xxx="-k.
  # //NOTE// This function won't work for those boot parameter can not be a varialble, e.g. live-boot-media (with -, it's not a legal variable), since if we assign it by ". live-boot-media=/live-hd", it will failed.
  local param_ parse_tmp cmdl_file
  #
  while [ $# -gt 0 ]; do
    case "$1" in
      -c|--cmdline-file)
         shift
         if [ -z "$(echo $1 |grep ^-.)" ]; then
           # skip the -xx option, in case 
           cmdl_file="$1"
           shift
         fi
         [ -z "$cmdl_file" ] && echo "-c is used, but no cmdl_file assigned." && exit 1
         ;;
      -*) echo "${0}: ${1}: invalid option" >&2
          exit 2 ;;
      *)  break ;;
    esac
  done
  param_="$1"
  parse_tmp="$(mktemp /tmp/cmdtmp.XXXXXX)"

  [ -z "$cmdl_file" ] && cmdl_file="/proc/cmdline"
  if [ ! -e "$cmdl_file" ]; then
    echo "cmdl_file ($cmdl_file) does _NOT_ exist!"
    exit 1
  fi

  for ik in $param_; do
    # The parameter maybe like: xxx=xyz, xxx="xyz", xxx="-k -x", or "xxx=-k -x" (see below)
    ###
    # The cases like xxx="-k -x" or "xxx=a b c", which allows spaces between " "
    # Possible complicated commands:
    # ocs_prerun="sshfs -o nonempty -p 22 root@myhost.mymachine:/home/partimag/ /home/partimag"
    # ocs_prerun="mount -t cifs -o username=user,password=pass //127.0.0.1/test /home/partimag"
    # ocs_prerun="sudo mount -t cifs -o user=ghost,password=ghost123 //192.168.1.1/tftpboot$/images/clonezilla /home/partimag" # Ref: https://sourceforge.net/projects/clonezilla/forums/forum/663168/topic/4589215, for samba share with hidden share, a "$" is in the end of dir name.
    # Therefore we have to add "/" ":" "=" "," "@", "\\$"
    #
    # For gurb2 1.99, although \" is put in boot parameter,
    # it will be shown in /proc/cmdline as the following:
    # Boot parameters assigned   ->  /proc/cmdline
    # 4 cases:                   
    # (1) ocs_prerun="sleep 5"   ->  "ocs_prerun=sleep 5" (Yes, with " in the beginning and in the end.
    # (2) ocs_prerun='sleep 5'   ->  "ocs_prerun=sleep 5"
    # (3) ocs_prerun=\"sleep 5\" ->   ocs_prerun=\"sleep 5\"
    # (4) ocs_prerun=dhclient    ->   ocs_prerun=dhclient
    # So far for syslinux (4.04), no such problem. Just use ocs_prerun="sleep 5".
    # Some examples about parsing these parameters:
    # =================
    # ocs_prerun1="ps -efw |grep 'bound 169.254.9.223' &"
    # ocs_prerun2="ps -efw |grep '[a-z]'"
    # ocs_prerun3="sshfs -o nonempty -p 22 root@myhost.mymachine:/home/partimag/ /home/partimag"
    # ocs_prerun4="mount -t cifs -o username=user,password=pass //127.0.0.1/test /home/partimag"
    # ocs_prerun5="sudo mount -t cifs -o user=ghost,password=ghost123 //192.168.1.1/tftpboot$/images/clonezilla /home/partimag" 
    # "ocs_prerun6=sleep 5"
    # "ocs_prerun7=sleep 5"
    # ocs_prerun8=\"sleep 5\"
    # ocs_prerun9="sed -i -e '/[1-6]:23:/ d' -e '/1:2345:respawn/ d'"
    # ocs_prerun10="sed -i -e s@#T0@T0@g -e s@dev/tty@dev/ttyS0@g /etc/inittab"
    # ocs_prerun11="lsblk|grep ' 1 '|grep ..sd|sort -k4hr|sed 's|..\(sd..\).*|mount /dev/\1 /mnt|;1p;d'|bash"
    # ocs_prerun12="ps -efw |grep \"[a-z]\""
    # ocs_repository=smb://name:passwd@192.168.1.1/images/
    # =================
    # ///NOTE/// We can not make it in _one_ case like this:
    # LC_ALL=C grep -oE -- "(\"|)*$ik=(\\\\\"|\")*([[:space:]]|[[:alnum:]]|_|-|\.|\/|:|=|,|@|\\$|>|\^|\*)*(\\\\\"|\")*([[:space:]]|$)+" $cmdl_file | sed -r -e "s|=\\\\\"|=\"|g" -e "s@\\\\\"([[:space:]]|$)+@\"@g" | sed -r -e 's|^\"(.*)=|\1=\"|g' > $parse_tmp
    # Since it might get wrong parsing like this:
    # root@debian:~# cat /proc/cmdline 
    # initrd=/live/initrd.img boot=live config  noswap nolocales edd=on nomodeset ocs_live_run="ocs-live-general" ocs_live_extra_param="" ocs_live_keymap="" ocs_live_batch="no" ocs_lang="" vga=788 ip= nosplash BOOT_IMAGE=/live/vmlinuz 
    # root@debian:~# grep -oE -- '("|)*ocs_lang=(\\"|")*([[:space:]]|[[:alnum:]]|_|-|\.|\/|:|=|,|@|\$|>|\^|\*)*(\\"|")*([[:space:]]|$)+' /proc/cmdline
    # ocs_lang="" vga=788 ip= nosplash BOOT_IMAGE=/live/vmlinuz <- WRONG RESULT. We just want ocs_lang=""
    if LC_ALL=C grep -Eq "($ik=\"|$ik=\\\\\")" $cmdl_file; then
      # For case like: ocs_prerun="sleep 5" or ocs_prerun=\"sleep 5\"
      LC_ALL=C grep -oE -- "$ik=(\"|\\\\\")[^\"]*(\"|\\\\\")([[:space:]]|$)+" $cmdl_file | sed -r -e "s|=\\\\\"|=\"|g" -e "s@\\\\\"([[:space:]]|$)+@\"@g" | sed -r -e 's|^\"(.*)=|\1=\"|g' > $parse_tmp
    elif LC_ALL=C grep -Eq "\"$ik=" $cmdl_file; then
      # For case like: "ocs_prerun=sleep 5", "ocs_prerun1=mount UUID=XXXYYZZ /mnt"
      # 2012/08/20 Without separating "=", it might fail in this case:
      # "ocs_prerun1=mount UUID=XXXYYZZ /mnt" -> ocs_prerun1=mount UUID="XXXYYZZ /mnt"
      # Therefore we have to use: sed -r -e 's|^\"(.*=)(.*=.*)*|\1\"\2|g'
      # 2020/12/26 When two "=" in the variable, e.g.,:
      # "ocs_live_run=ocs-sr -q2 -j2 -z1p -p poweroff savedisk autoname-wpfx=fox serialno=xyz"
      # it fails at:
      # ocs_live_run=ocs-sr -q2 -j2 -z1p -p poweroff savedisk autoname-wpfx="fox serialno=xyz"
      # since sed is greedy regex.
      # Therefore we have to use non-greedy regex language, perl, for this purpose: 
      # perl -pi -e 's/(^")(.*?=)(.*=.*)*/$2"$3/g' $parse_tmp
      # Ref: http://stackoverflow.com/questions/9681393/sed-multiple-patterns-on-the-same-line-how-to-match-parse-first-one
      #      https://www.ultraedit.com/support/tutorials-power-tips/ultraedit/non-greedy-perl-regex.html
      LC_ALL=C grep -oE -- "\"$ik=[^\"]*\"([[:space:]]|$)+" $cmdl_file | \
	       sed -r -e "s|=\\\\\"|=\"|g" -e "s@\\\\\"([[:space:]]|$)+@\"@g" \
	       > $parse_tmp
      perl -pi -e 's/(^")(.*?=)(.*=.*)*/$2"$3/g' $parse_tmp
    else
      # This is for case xxx=xyz, no space in its assignment
      LC_ALL=C grep -oE -- "$ik=[^[:space:]]*([[:space:]]|$)+" $cmdl_file > $parse_tmp
    fi
    # now we can get the variables
    # . $parse_tmp <--- One more thing to do.
    # In we just read the variable using ". $parse_tmp", and it happends to have "$" in the variable, then the way will go wrong. E.g. the output file "/tmp/cmdtmp.XXXXXX" contains this line:
    # ocs_prerun="mount -t cifs -o user=steven,domain=ABC.COM,password=12$ABC34 //serv/images /home/partimag"
    # By running ". /tmp/cmdtmp.XXXXXX", the ocs_prerun will be:
    # mount -t cifs -o user=steven,domain=ABC.COM,password=12 //serv/images /home/partimag
    # It's because $ABC34 is nothing here. Therefore we have to protect "$" in the temp file.
    perl -pi -e 's|\$|\\\$|g' $parse_tmp
    . $parse_tmp
  done
  [ -f "$parse_tmp" ] && rm -f $parse_tmp
} # parse_cmdline_option
#
output_netinstall_boot_menu() {
  local TDIR  # Where netinstall kernel/initrd exists (e.g. /tftpboot/nbi_img)
  local NB_CFG_DIR_FNAME  # Where pxeliux cfg file exists (e.g. /tftpboot/nbi_img/pxelinux.cfg/)
  local menu_hint ni_ver ni_arch boot_file_dir
  local nb_mode_="pxe" # Default mode if not assigned
  local usb_boot_media_="no"  # Default not to prepend the setting for USB boot media
  # output the netinstall menu
  # Here 2 types: Linux and BSD
  # The netinstall kernel files (linux) or pxeboot file (bsd) in /tftpboot/nbi_img are, e.g.:
  # Type 1: for Linux, the file names are like:
  # vmlinuz-netinstall-CentOS-4.6-i386
  # vmlinuz-netinstall-CentOS-4.6-x86_64
  # vmlinuz-netinstall-CentOS-5.1-i386
  # vmlinuz-netinstall-CentOS-5.1-x86_64
  # vmlinuz-netinstall-Debian-etch-amd64
  # vmlinuz-netinstall-Debian-etch-i386
  # vmlinuz-netinstall-Debian-sarge-i386
  # vmlinuz-netinstall-Fedora-7-i386
  # vmlinuz-netinstall-Fedora-7-x86_64
  
  # Type 2: for BSD, the file names are like:
  # OpenBSD-4.2-i386-pxeboot.0
  # FreeBSD-7.0-i386-pxeboot.0

  while [ $# -gt 0 ]; do
   case "$1" in
     -e|--efi) nb_mode_="efi"; shift;;
     -p|--prefix)
           shift
           if [ -z "$(echo $1 |grep ^-.)" ]; then
             # skip the -xx option, in case 
             boot_file_dir="$1"
             shift
           fi
           if [ -z "$boot_file_dir" ]; then
             echo "-p is used, but no \"boot_file_dir\" assigned."
             echo "$msg_program_stop"
             [ "$save_restore_error_log" = "yes" ] && copy_error_log
             exit 1
           fi
           ;;
     -u|--usb-boot-media) usb_boot_media_="yes"; shift;;
     -*)   echo "${0}: ${1}: invalid option" >&2
           exit 2 ;;
     *)    break ;;
   esac
  done

  TDIR="$1" 
  NB_CFG_DIR_FNAME="$2"

  if [ "$nb_mode_" = "efi" -a "$usb_boot_media_" = "yes" ]; then
     # This is for drbl-usb-netinstall use. For the netboot of DRBL clients,
     # the gen-grub-efi-nb-menu will prepend those configs for diskless clients.
     cat <<-PXE_END > $NB_CFG_DIR_FNAME
# Netboot menu for grub
set pref=/boot/grub
set default="0"
insmod efi_gop
insmod efi_uga
if [ x\$feature_default_font_path = xy ] ; then
   font=unicode
else
   font=\$prefix/unifont.pf2
fi

if loadfont \$font; then
  set gfxmode=auto
  insmod gfxterm
  terminal_output gfxterm
fi
set timeout=30
set hidden_timeout_quiet=false
insmod png
if background_image \$pref/drblwp.png; then
  set color_normal=black/white
  set color_highlight=green/white
else
  set color_normal=white/black
  set color_highlight=black/white
fi

# Decide if the commands: linux/initrd (default) or linuxefi/initrdefi
set linux_cmd=linux
set initrd_cmd=initrd
export linux_cmd initrd_cmd
# Since "linux/initrd" works for uEFI boot, no matter it's secure boot or not. Just use them.
# if [ "\${grub_cpu}" = "x86_64" -o "\${grub_cpu}" = "i386" ];then
#   set linux_cmd=linuxefi
#   set initrd_cmd=initrdefi
# fi

PXE_END
  fi
  
  # Type 1: Linux
  for inet in $TDIR/vmlinuz-netinstall-*; do
   # /tftpboot/nbi_img/vmlinuz-netinstall-CentOS-4-i386
   # /tftpboot/nbi_img/initrd-netinstall-CentOS-4-i386.img

   [ ! -e "$inet" ] && continue
   # Truncate "vmlinuz-"
   # For debina based, back convert x86-64 to x86_64, since alien convert x86_64 to x86-64.
   kernel="$(basename $inet)"
   inet_="$(basename $inet | sed -e "s/^vmlinuz-//g" -e "s/x86-64/x86_64/g")"
   img_menu="$(echo "$inet_" | awk -F"-" '{print $1"-"$2"-"$3"-"$4}')"
   img="$(unalias ls 2>/dev/null; ls $TDIR/*${inet_}* 2>/dev/null)"
   img="$(basename $img)"

   extra_append=""
   if [ -n "$(echo $inet | grep -i "\-debian-woody" 2>/dev/null)" ]; then
      # For Debian Woody, we use extra options bf24
      # refer to http://www.debianplanet.com/node.php?id=818&cid=13384
      NETINSTALL_RAMDISK_SIZE="$NETINSTALL_RAMDISK_SIZE_DEF"
      extra_append="flavor=bf2.4"
      menu_hint=""
   elif [ -n "$(echo $inet | grep -i "\-debian-sarge" 2>/dev/null)" ]; then
      # For Debian Sarge, we need extra options in append
      # refer to http://opensource.nchc.org.tw/debian/dists/sarge/main/installer-i386/current/images/netboot/pxelinux.cfg/default
      NETINSTALL_RAMDISK_SIZE="$NETINSTALL_RAMDISK_SIZE_DEF"
      extra_append="root=/dev/rd/0 devfs=mount,dall rw  --"
      menu_hint=""
   elif [ -n "$(echo $inet | grep -iE "\-debian-etch" 2>/dev/null)" ]; then
      # Ref: http://free.nchc.org.tw/debian/dists/etch/main/installer-i386/current/images/netboot//debian-installer/i386/pxelinux.cfg/default
      NETINSTALL_RAMDISK_SIZE=""
      extra_append="vga=normal"
   elif [ -n "$(echo $inet | grep -iE "\-debian-" 2>/dev/null)" ]; then
      # For version >= lenny, gtk netinstall mode is available, actually we can turn on it by adding "video=vesa:ywrap,mtrr vga=788" in the boot parameters. However, since normally those people use debian can accept text mode, we do not put "video=vesa:ywrap,mtrr vga=788" here.
      # http://free.nchc.org.tw/debian/dists/lenny/main/installer-i386/current/images/netboot/gtk/debian-installer/i386/boot-screens/txt.cfg
      NETINSTALL_RAMDISK_SIZE=""
      extra_append="vga=normal"
      menu_hint="# Hint: To turn on gtk mode installation, append 'video=vesa:ywrap,mtrr vga=788' in the boot parameters"
   elif [ -n "$(echo $inet | grep -iE "\-redhat-" 2>/dev/null)" ]; then
      # For RedHat, enable reiserfs when installing
      NETINSTALL_RAMDISK_SIZE="$NETINSTALL_RAMDISK_SIZE_DEF"
      extra_append="reiserfs"
      menu_hint=""
   elif [ -n "$(echo $inet | grep -iE "\-fedora-" 2>/dev/null)" ]; then
      # Fedora vmlinuz name e.g. vmlinuz-netinstall-Fedora-17-x86_64
      ni_ver="$(echo $inet | cut -f 4 -d "-")"
      ni_arch="$(echo $inet | cut -f 5 -d "-")"
      # ramdisk_size only necessary for fedora 1-4, from fc5, it's initramfs, ramdisk_size is not used anymore 
      if [ -n "$(echo $inet | grep -iE "\-fedora-[1-4]-" 2>/dev/null)" ]; then
        NETINSTALL_RAMDISK_SIZE="$NETINSTALL_RAMDISK_SIZE_DEF"
      else
        NETINSTALL_RAMDISK_SIZE=""
      fi
      if [ -n "$(echo $inet | grep -iE "\-fedora-([5-9]|1[1-6])-" 2>/dev/null)" ]; then
        # For Fedora 5 to 16.
        extra_append=""
      elif [ -n "$(echo $inet | grep -iE "\-fedora-(1[7-9]|20)-" 2>/dev/null)" ]; then
        # For Fedora 16 to 20.
        echo "Using Fedora installation repository \"$fedora_url_site\" from drbl.conf"
        extra_append="inst.repo=$fedora_url_site/fedora/linux/releases/$ni_ver/Fedora/$ni_arch/os"
      else
        # For Fedora 21 or later
        echo "Using Fedora installation repository \"$fedora_url_site\" from drbl.conf"
        extra_append="inst.repo=$fedora_url_site/fedora/linux/releases/$ni_ver/Server/$ni_arch/os"
      fi
      # For Fedora, enable reiserfs when installing
      menu_hint=""
   elif [ -n "$(echo $inet | grep -iE "\-centos-" 2>/dev/null)" ]; then
      # CentOS vmlinuz name e.g. vmlinuz-netinstall-CentOS-7-x86_64
      ni_ver="$(echo $inet | cut -f 4 -d "-")"
      ni_arch="$(echo $inet | cut -f 5 -d "-")"
      # ramdisk_size only necessary for centos 1-4, from 5, it's initramfs, ramdisk_size is not used anymore 
      if [ -n "$(echo $inet | grep -iE "\-centos-[1-4]-" 2>/dev/null)" ]; then
        NETINSTALL_RAMDISK_SIZE="$NETINSTALL_RAMDISK_SIZE_DEF"
      else
        NETINSTALL_RAMDISK_SIZE=""
      fi
      if [ -n "$(echo $inet | grep -iE "\-centos-[5-6]-" 2>/dev/null)" ]; then
        # For CentOS 5 to 6.
        extra_append=""
      elif [ -n "$(echo $inet | grep -iE "\-centos-7-" 2>/dev/null)" ]; then
        # CentOS 7
        # Ref: https://bugzilla.redhat.com/show_bug.cgi?id=810005
        echo "Using CentOS installation repository \"$centos_url_site\" from drbl.conf"
	# http://free.nchc.org.tw/centos/7/os/x86_64/
        extra_append="inst.repo=$centos_url_site/centos/$ni_ver/os/$ni_arch"
      else
        # CentOS 8 or later
        echo "Using CentOS installation repository \"$centos_url_site\" from drbl.conf"
	# http://free.nchc.org.tw/centos/8/BaseOS/x86_64/
        extra_append="inst.repo=$centos_url_site/centos/$ni_ver/BaseOS/$ni_arch/os/"
      fi
      # For CentOS, enable reiserfs when installing
      menu_hint=""
   elif [ -n "$(echo $inet | grep -iE "(\-mandrake-|\-mandriva-)" 2>/dev/null)" ]; then
      # For Mandrake/Mandriva
      # use larger ramdisk size for Mandrake, overwrite the default one.
      NETINSTALL_RAMDISK_SIZE=128000
      extra_append="acpi=ht vga=788 splash=silent label vgalo"
      menu_hint=""
   elif [ -n "$(echo $inet | grep -iE "\-ubuntu-[a-e]" 2>/dev/null)" ]; then
      # For other Ubuntu: 5.10, 6.06, 6.10
      # ref to ftp://linux.nchc.org.tw/distributions/ubuntu/dists/hoary/main/installer-i386/current/images/netboot/ubuntu-installer/i386/pxelinux.cfg/default
      NETINSTALL_RAMDISK_SIZE="$NETINSTALL_RAMDISK_SIZE_DEF"
      extra_append="root=/dev/rd/0 rw  --"
      menu_hint=""
   elif [ -n "$(echo $inet | grep -iE "\-ubuntu-[f-i]" 2>/dev/null)" ]; then
      # For Ubuntu Feisty (7.04)
      # ref to http://opensource.nchc.org.tw/ubuntu/dists/feisty/main/installer-i386/current/images/netboot/ubuntu-installer/i386/pxelinux.cfg/default
      # It's initramfs, so ramdisk_size is no more.
      NETINSTALL_RAMDISK_SIZE=""
      extra_append="vga=normal --"
      menu_hint=""
   elif [ -n "$(echo $inet | grep -iE "\-ubuntu-[j-z]" 2>/dev/null)" ]; then
      # Ref: http://free.nchc.org.tw/ubuntu/dists/jaunty/main/installer-i386/current/images/netboot/gtk/ubuntu-installer/i386/boot-screens/text.cfg
      # It's initramfs, so ramdisk_size is no more.
      NETINSTALL_RAMDISK_SIZE=""
      # Looks like gtk netinstall in not quite stable for jaunty, here we turn off framebuffer mode.
      #extra_append="video=vesa:ywrap,mtrr vga=788 --"
      extra_append="vga=normal --"
      menu_hint="# Hint: To turn on gtk mode installation, append 'video=vesa:ywrap,mtrr vga=788' in the boot parameters"
   elif [ -n "$(echo $inet | grep -i "\-suse-" 2>/dev/null)" ]; then
      # For SuSE
      # For extra_append, refer to something like 
      # http://free.nchc.org.tw/SuSE/SuSE/i386/9.3/boot/loader/isolinux.cfg
      # use larger ramdisk size, overwrite the default one.
      NETINSTALL_RAMDISK_SIZE=128000
      extra_append="splash=silent showopts"
      menu_hint=""
   elif [ -n "$(echo $inet | grep -i "\-opensuse-" 2>/dev/null)" ]; then
      # For OpenSuSE
      # For extra_append, refer to something like 
      # http://ftp.cs.pu.edu.tw/Linux/OpenSuse/distribution/SL-10.0-OSS/inst-source/boot/loader/isolinux.cfg
      # use larger ramdisk size, overwrite the default one.
      NETINSTALL_RAMDISK_SIZE=128000
      extra_append="splash=silent showopts"
      menu_hint=""
   else
      NETINSTALL_RAMDISK_SIZE="$NETINSTALL_RAMDISK_SIZE_DEF"
      extra_append=""
      menu_hint=""
   fi

   # skip if we can not find the menu, img or kernel.
   [ -z "$img_menu" ] && continue
   [ -z "$img" -o -z "$kernel" ] && continue

   # Generate the description:
   # EX for i: rh-8.0-netinstall
   # create the description for the netinstall image
   des="$(echo $img_menu | sed -e "s/^netinstall-//g" | sed -e "s/-/ /g")"
   des="${des} installation via network"
   # For initramfs, ramdisk_size is no more.
   if [ -n "$NETINSTALL_RAMDISK_SIZE" ]; then
     ramdisk_size_opt="ramdisk_size=$NETINSTALL_RAMDISK_SIZE"
   else
     ramdisk_size_opt=""
   fi

   if [ "$nb_mode_" = "pxe" ]; then
     echo "Adding $img_menu menu..."
     [ -n "$verbose" ] && echo "extra option in append: $extra_append"    
     cat <<-PXE_END >> $NB_CFG_DIR_FNAME
label $img_menu
  # MENU DEFAULT
  MENU HIDE
  MENU LABEL $des
  # MENU PASSWD
  kernel $boot_file_dir$kernel
  append initrd=$boot_file_dir$img $ramdisk_size_opt $extra_append
  $menu_hint
  TEXT HELP
  * Boot menu for BIOS machine
  * $des
  ENDTEXT

PXE_END
   else
    # Only output x86-64/amd64 one for uEFI mode
    if [ -n "$(echo $kernel | grep -iE -- "(x86-64|x86_64|amd64|i386)")" ]; then
     echo "Adding $img_menu menu..."
     [ -n "$verbose" ] && echo "extra option in append: $extra_append"    
     cat <<-PXE_END >> $NB_CFG_DIR_FNAME
menuentry "$des" --id $img_menu {
  set check_signatures=no
  echo "Enter netinstall for $img_menu..."
  echo "Loading Linux kernel..."
  \$linux_cmd $boot_file_dir$kernel $ramdisk_size_opt $extra_append
  echo "Loading initial ramdisk..."
  \$initrd_cmd $boot_file_dir$img
}

PXE_END
    fi
   fi
  done

  # Type 2: BSD
  for inet in $TDIR/*-pxeboot.0; do
   # Ex: /tftpboot/nbi_img/FreeBSD-7.0-i386-pxeboot.0
   [ ! -e "$inet" ] && continue
   # Truncate "-pxeboot.0"
   inet_="$(basename $inet | sed -e "s/-pxeboot.0//g")"
   img_menu="$(echo "$inet_" | awk -F"-" '{print $1"-"$2"-"$3}')-netinstall"
   img="$(unalias ls 2>/dev/null; ls $TDIR/*${inet_}* 2>/dev/null)"
   img="$(basename $img)"
   # create the description for the netinstall image
   des="$(echo $img_menu | sed -e "s/-netinstall$//g" | sed -e "s/-/ /g")"
   des="${des} installation via network"
   [ -z "$img_menu" ] && continue
   echo "Adding $img_menu menu..."
   if [ "$nb_mode_" = "pxe" ]; then
     cat <<-PXE_END >> $NB_CFG_DIR_FNAME
label $img_menu
  # MENU DEFAULT
  MENU HIDE
  MENU LABEL $des
  # MENU PASSWD
  kernel $boot_file_dir$img
  TEXT HELP
  * Boot menu for BIOS machine
  * $des
  ENDTEXT

PXE_END
   else
     cat <<-PXE_END >> $NB_CFG_DIR_FNAME
menuentry "$des" --id $img_menu {
  echo "Enter netinstall for $img_menu..."
  echo "Loading Linux kernel..."
  \$linux_cmd $boot_file_dir$img
}

PXE_END
   fi
  done
} # end of output_netinstall_boot_menu
#
get_syslinux_binary_for_dos_linux() {
  local sysl_dir="$1"
  # syslinux_ver is not required. If it's not assigned, the latest one on the web will be used.
  local syslinux_ver="$2"
  local syslinux_tarball syslinux_ver_subdir syslinux_extra_c32 dirprefix syslinux_efi_coms
  local found_url valid_ulr
  [ -z "$sysl_dir" -o ! -d "$sysl_dir" ] && echo "No sysl_dir!" && exit 1
  # syslinux_binsrc_url is like:
  # http://www.kernel.org/pub/linux/utils/boot/syslinux/
  # For any version 4.xx, it will be found in http://www.kernel.org/pub/linux/utils/boot/syslinux/4.xx/. However, the latest one is in http://www.kernel.org/pub/linux/utils/boot/syslinux/
  if [ -z "$syslinux_ver" ]; then
    # If no version is assigned, find the latest one.
    syslinux_tarball="$(LC_ALL=C list_latest_tarball -f xz $syslinux_binsrc_url)" 
    syslinux_ver="$(LC_ALL=C echo "$syslinux_tarball" | sed -e "s/^syslinux-//g" -e "s/.tar.xz//g")"
  else
    syslinux_tarball="syslinux-${syslinux_ver}.tar.xz"
  fi
  if [ -z "$(echo $syslinux_ver | grep -iE -- "-pre[[:digit:]]+")" ]; then
    # Stable release, not testing version.
    # Convert the version number to subdir name, e..g 4.04 -> 4.xx
    syslinux_ver_subdir="$(LC_ALL=C echo "$syslinux_ver" | sed -r -e "s/\.[[:digit:]]*$/\.xx/g")"
  else
    # Testing release. File name is like: syslinux-6.02-pre16.tar.xz
    # The URL for such a testing version is like: http://free.nchc.org.tw/syslinux/Testing/6.02/
    syslinux_ver_subdir="$(LC_ALL=C echo "$syslinux_ver" | sed -r -e "s/-pre[[:digit:]]+$//g")"
    syslinux_ver_subdir="Testing/$syslinux_ver_subdir"
  fi
  found_url="false"
  while [ "$found_url" = "false" ]; do
    if `check_url $syslinux_binsrc_url/$syslinux_ver_subdir/$syslinux_tarball`; then
      valid_ulr="$syslinux_binsrc_url/$syslinux_ver_subdir/$syslinux_tarball"
      found_url="true"
    else
      # E.g., 6.04 -> 6.03
      # Because Debian has syslinux like: 3:6.04~git20190206.bf6db5b4+dfsg1-1, but
      # actually 6.04 is not officially released on syslinux.org (Sep/25/2021).
      syslinux_ver="$(LC_ALL=C echo "scale=2; $syslinux_ver - 0.01" | bc -l)"
      echo "Try earlier syslinux version $syslinux_ver..."
      syslinux_tarball="syslinux-${syslinux_ver}.tar.xz"
    fi
  done
  echo "Downloading $valid_ulr..."
  wget $wget_opt -P $sysl_dir $valid_ulr
  # For syslinux 6.x, due to EFI feature was added, *.c32 might be in different dirs, e.g. for menu.c32:
  # $ tar tvJf syslinux-5.10.tar.xz | grep -w menu.c32
  # -rwxrwxr-x mfleming/syslinux  25808 2013-06-05 03:33 syslinux-5.10/com32/menu/menu.c32
  # $ tar tvJf syslinux-6.01.tar.xz |grep -w menu.c32
  # -rwxrwxr-x mfleming/syslinux  25708 2013-07-04 21:26 syslinux-6.01/bios/com32/menu/menu.c32
  # -rwxrwxr-x mfleming/syslinux  26012 2013-07-04 21:27 syslinux-6.01/efi32/com32/menu/menu.c32
  # -rwxrwxr-x mfleming/syslinux  31416 2013-07-04 21:28 syslinux-6.01/efi64/com32/menu/menu.c32
  # Therefore we have to parse them...
  # //NOTE// The syslinux tarball (<= ver 6.03) from syslinux.org only contains x86 (32-bit) programs for GNU/Linux, no x86-64 ones.
  if [ -n "$(tar -tvJf $sysl_dir/syslinux-${syslinux_ver}.tar.xz | \
	     grep -w "bios/com32/menu/menu.c32")" ]; then
    dirprefix="bios/"
  else
    dirprefix_bios=""
  fi 
  # For syslinux 5.x, ./com32/elflink/ldlinux/ldlinux.c32, ./com32/lib/libcom32.c32, and ./com32/libutil/libutil.c32 are required.
  for i in $sys_pxelinux_v5p_required_c32; do
    if [ -n "$(LC_ALL=C tar -tvJf $sysl_dir/syslinux-${syslinux_ver}.tar.xz | grep -Ew $i)" ]; then
      syslinux_extra_c32="syslinux-${syslinux_ver}/${dirprefix}com32/elflink/ldlinux/ldlinux.c32 syslinux-${syslinux_ver}/${dirprefix}com32/lib/libcom32.c32 syslinux-${syslinux_ver}/${dirprefix}com32/libutil/libutil.c32" 
      break
    fi
  done
  # Extract win32/syslinux.exe, linux/syslinux and more. This is for BIOS machine
  echo "Extracting files..."
  mkdir -p $sysl_dir/bios/
  (
   cd $sysl_dir/bios/
   # From syslinux 3.73, linux/syslinux is hardlink to linux/syslinux-nomtools, therefore we have to use --wildcards to extract it. Otherwise it will fail.
   tar --wildcards -xvJf ../syslinux-${syslinux_ver}.tar.xz syslinux-${syslinux_ver}/${dirprefix}com32/menu/menu.c32 syslinux-${syslinux_ver}/${dirprefix}com32/menu/vesamenu.c32 syslinux-${syslinux_ver}/${dirprefix}com32/chain/chain.c32 syslinux-${syslinux_ver}/${dirprefix}win32/syslinux.exe syslinux-${syslinux_ver}/${dirprefix}win64/syslinux64.exe syslinux-${syslinux_ver}/${dirprefix}linux/syslinux* syslinux-${syslinux_ver}/${dirprefix}extlinux/extlinux* syslinux-${syslinux_ver}/${dirprefix}mbr/mbr.bin syslinux-${syslinux_ver}/${dirprefix}core/isolinux.bin syslinux-${syslinux_ver}/${dirprefix}memdisk/memdisk $syslinux_extra_c32
   mv -f syslinux-${syslinux_ver}/${dirprefix}com32/menu/menu.c32 .
   mv -f syslinux-${syslinux_ver}/${dirprefix}com32/menu/vesamenu.c32 .
   mv -f syslinux-${syslinux_ver}/${dirprefix}com32/chain/chain.c32 .
   mv -f syslinux-${syslinux_ver}/${dirprefix}win32/syslinux.exe . 
   mv -f syslinux-${syslinux_ver}/${dirprefix}win64/syslinux64.exe . 
   mv -f syslinux-${syslinux_ver}/${dirprefix}mbr/mbr.bin .
   mv -f syslinux-${syslinux_ver}/${dirprefix}linux/syslinux .
   mv -f syslinux-${syslinux_ver}/${dirprefix}extlinux/extlinux .
   mv -f syslinux-${syslinux_ver}/${dirprefix}core/isolinux.bin .
   mv -f syslinux-${syslinux_ver}/${dirprefix}memdisk/memdisk .
   if [ -n "$syslinux_extra_c32" ]; then
      mv -f syslinux-${syslinux_ver}/${dirprefix}com32/elflink/ldlinux/ldlinux.c32 .
      mv -f syslinux-${syslinux_ver}/${dirprefix}com32/lib/libcom32.c32 .
      mv -f syslinux-${syslinux_ver}/${dirprefix}com32/libutil/libutil.c32 .
      chmod 644 *.c32
   fi
  )
  # For EFI machine
  if [ "$live_efi_boot_loader" = "syslinux" ]; then
    if [ -n "$dirprefix" ]; then
      # This means the downloaded syslinux support EFI (for version >=6.01), then we should prepare that, too. Here we only add efi64, since efi32 is not very common for modern machine.
      # Ref: http://www.rodsbooks.com/efi-bootloaders/syslinux.html especially the tarball http://www.rodsbooks.com/efi-bootloaders/syslinux-6.01.pre5-1.tgz
      syslinux_efi_coms="menu.c32 vesamenu.c32 ldlinux.c32 chain.c32 libutil.c32 libcom32.c32"
      # ./efi64/efi/syslinux.efi -> bootx64.efi
      # ./efi64/com32/elflink/ldlinux/ldlinux.e64
      mkdir -p $sysl_dir/efi/
      (
       cd $sysl_dir/efi/
       tar --wildcards -xvJf ../syslinux-${syslinux_ver}.tar.xz \
       syslinux-${syslinux_ver}/efi64/efi/syslinux.efi \
       syslinux-${syslinux_ver}/efi64/com32/elflink/ldlinux/ldlinux.e64 \
       syslinux-${syslinux_ver}/efi64/com32/menu/menu.c32 \
       syslinux-${syslinux_ver}/efi64/com32/menu/vesamenu.c32 \
       syslinux-${syslinux_ver}/efi64/com32/chain/chain.c32 \
       syslinux-${syslinux_ver}/efi64/com32/lib/libcom32.c32 \
       syslinux-${syslinux_ver}/efi64/com32/libutil/libutil.c32
    
       mv -f syslinux-${syslinux_ver}/efi64/efi/syslinux.efi bootx64.efi
       mv -f syslinux-${syslinux_ver}/efi64/com32/elflink/ldlinux/ldlinux.e64 .
       mv -f syslinux-${syslinux_ver}/efi64/com32/menu/menu.c32 .
       mv -f syslinux-${syslinux_ver}/efi64/com32/menu/vesamenu.c32 .
       mv -f syslinux-${syslinux_ver}/efi64/com32/chain/chain.c32 .
       mv -f syslinux-${syslinux_ver}/efi64/com32/lib/libcom32.c32 .
       mv -f syslinux-${syslinux_ver}/efi64/com32/libutil/libutil.c32 .
       chmod 644 ldlinux.e64 *.c32
      )
    fi
  fi
} # end of get_syslinux_binary_for_dos_linux
#
put_syslinux_makeboot_for_usb_flash() {
  local t_dir="$1"
  # syslinux_ver is not required. If it's not assigned, the latest one on the web will be used.
  local syslinux_ver="$2"  
  local sysl_dir sysl_extra_c32_chklist
  local latest_syslinux_v apt_tmpdir
  sysl_extra_c32_chklist="ldlinux.c32 libcom32.c32 libutil.c32"
  [ -z "$t_dir" -o ! -d "$t_dir" ] && echo "No t_dir!" && exit 1
  # Function to put syslinux.exe and syslinux (linux ELF 32-bit LSB executable) in dir t_dir 
  mkdir -p $t_dir/utils/{linux,win32,win64,mbr}
  mkdir -p $t_dir/utils/linux/{x86,x64}
  cp -a $pxelinux_binsrc_dir/makeboot.sh $t_dir/utils/linux/
  cp -a $pxelinux_binsrc_dir/makeboot.bat $t_dir/utils/win32/
  cp -a $pxelinux_binsrc_dir/makeboot64.cmd $t_dir/utils/win64/
  sysl_dir="$(mktemp -d /tmp/sysl_dir.XXXXXX)"
  get_syslinux_binary_for_dos_linux $sysl_dir $syslinux_ver
  # syslinux does not provide any option to find the version number.
  # Try to find the version of syslinux
  # Use strings to find the version, the output is like:
  # SYSLINUX 3.71 Debian-2008-08-04
  if [ -z "$syslinux_ver" ]; then
    SYSLINUX_VER="$(LC_ALL=C strings $sysl_dir/bios/syslinux | grep -iE "^SYSLINUX.*[[:digit:]]+" | awk -F" " '{print $2}')"
  else
    SYSLINUX_VER="$syslinux_ver"
  fi
  echo "SYSLINUX version: $SYSLINUX_VER" > $t_dir/utils/linux/VERSION.txt
  cp -a $t_dir/utils/linux/VERSION.txt $t_dir/utils/win32/
  cp -a $t_dir/utils/linux/VERSION.txt $t_dir/utils/win64/
  echo "Precompiled binary syslinux files were extracted from $syslinux_binsrc_url/syslinux-${syslinux_ver}.tar.xz" > $t_dir/utils/README.txt
  # For BIOS machine
  cp -af $sysl_dir/bios/{isolinux.bin,memdisk,menu.c32,vesamenu.c32,chain.c32} $t_dir/syslinux/
  # To make the version consistent, put them to isolinux dir, too.
  # Jan/19/2014 We have unified isolinux and syslinux dir as one dir syslinux only.
  # cp -af $sysl_dir/bios/{menu.c32,vesamenu.c32,chain.c32} $t_dir/isolinux/
  cp -af $sysl_dir/bios/syslinux.exe $t_dir/utils/win32/
  cp -af $sysl_dir/bios/syslinux64.exe $t_dir/utils/win64/
  cp -af $sysl_dir/bios/mbr.bin $t_dir/utils/mbr/
  for i in $sysl_extra_c32_chklist; do
    if [ -e $sysl_dir/bios/$i ]; then
      cp -af $sysl_dir/bios/$i $t_dir/syslinux/
      # To make the version consistent, put them to isolinux dir, too.
      # Jan/19/2014 We have unified isolinux and syslinux dir as one dir syslinux only.
      # cp -af $sysl_dir/bios/$i $t_dir/isolinux/
    fi
  done
  if [ -n "$(LC_ALL=C file $sysl_dir/bios/syslinux | grep -iEwo "ELF 32-bit")" ]; then
    cp -af $sysl_dir/bios/{syslinux,extlinux} $t_dir/utils/linux/x86
  else
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "32-bit syslinux and extlinux not found!"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  fi
  if [ -n "$(LC_ALL=C file /usr/bin/syslinux | grep -iEwo "ELF 64-bit")" ]; then
    # If it's Debian, use better way to get the right version of syslinux and extlinux, and overwrite the ones from syslinux zip file
    check_distribution_name 
    if [ "$OS_type" = "DBN" ]; then
      # latest_syslinux_v is like: 3:6.03+dfsg-14.1+deb9u1
      apt-get update
      latest_syslinux_v="$(LC_ALL=C apt-cache show syslinux | grep -iE "^Version:" | grep -Ew "${SYSLINUX_VER}" | sort -V -r | head -n 1 | awk -F" " '{print $2}')"
      
      apt_tmpdir="$(mktemp -d /tmp/apt_deb.XXXXXX)"
      (
      cd $apt_tmpdir
      apt-get download syslinux:amd64=${latest_syslinux_v} syslinux-common:amd64=${latest_syslinux_v} extlinux:amd64=${latest_syslinux_v=} isolinux:amd64=${latest_syslinux_v=}
      # apt-get download syslinux:amd64 syslinux-common:amd64 extlinux:amd64 isolinux:amd64
      for ideb in $apt_tmpdir/*.deb; do
        dpkg -x $ideb $apt_tmpdir/
      done
      )
      cp -avf $apt_tmpdir/usr/bin/{syslinux,extlinux} $t_dir/utils/linux/x64/
      cp -avf $apt_tmpdir/usr/lib/syslinux/memdisk $t_dir/syslinux/
      cp -avf $apt_tmpdir/usr/lib/ISOLINUX/isolinux.bin $t_dir/syslinux/
      cp -avf $apt_tmpdir/usr/lib/syslinux/mbr/mbr.bin $t_dir/utils/mbr/
      c32_mod="chain.c32 ldlinux.c32 libcom32.c32 libutil.c32 menu.c32 vesamenu.c32"
      for i in $c32_mod; do
        cp -avf $apt_tmpdir/usr/lib/syslinux/modules/bios/$i $t_dir/syslinux/
      done
      if [ -n "$(echo $apt_tmpdir | grep -Ew "apt_deb")" ]; then
        rm -rf $apt_tmpdir
      fi
      (
      mkdir $apt_tmpdir; cd $apt_tmpdir
      # apt-get download syslinux:i386=${latest_syslinux_v} extlinux:i386=${latest_syslinux_v=} 
      apt-get download syslinux:i386 extlinux:i386 
      for ideb in $apt_tmpdir/*.deb; do
        dpkg -x $ideb $apt_tmpdir/
      done
      )
      # Only /usr/bin/{syslinux,extlinux}, for those *.c32 and other files, use those from amd64 deb.
      cp -avf $apt_tmpdir/usr/bin/{syslinux,extlinux} $t_dir/utils/linux/x86/
    else
      # Using the one from running AMD64 GNU/Linux. However, this might be different version from the downloaded syslinux zip file.
      cp -af /usr/bin/{syslinux,extlinux} $t_dir/utils/linux/x64
    fi
  else
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "64-bit syslinux and extlinux not found in the dir /usr/bin/!"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  fi
  # For EFI machine
  if [ "$live_efi_boot_loader" = "syslinux" ]; then
    if [ -d "$sysl_dir/efi" ]; then
      mkdir -p $t_dir/EFI/boot/
      cp -af $sysl_dir/efi/bootx64.efi $t_dir/EFI/boot/
      cp -af $sysl_dir/efi/ldlinux.e64 $t_dir/EFI/boot/
      cp -af $sysl_dir/efi/*.c32 $t_dir/EFI/boot/
    fi
  fi
  [ -d "$sysl_dir" -a -n "$(echo $sysl_dir | grep "sysl_dir")" ] && rm -rf $sysl_dir
} # end of put_syslinux_makeboot_for_usb_flash
#
create_live_required_debian_based_prompt() {
  # lh_ver_required is global varible from drbl-ocs.conf
  local lh_ver debootstrap_ver
  # live-helper package name was changed to be live-build after 2.0~a20
  lh_ver="$(LC_ALL=C dpkg-query -W -f='${Version}\n' live-build)"
  if [ -z "$lh_ver" ]; then
    # Try to find the old package name.
    lh_ver="$(LC_ALL=C dpkg-query -W -f='${Version}\n' live-helper)"
  fi
  debootstrap_ver="$(LC_ALL=C debootstrap --version | grep -iEw "^debootstrap" | awk -F" " '{print $2}')"
  mmdebstrap_ver="$(LC_ALL=C mmdebstrap --version | grep -iEw "^mmdebstrap" | awk -F" " '{print $2}')"
  if dpkg --compare-versions "$lh_ver" "<<" "$lh_ver_required"; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "Required live helper or live build version: $lh_ver_required"
    echo "Installed live helper or live build version: $lh_ver"
    echo "You have to install patched live-helper or live-build (${lh_ver_required}drbl or later, modified by DRBL project)"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "Program terminated!"
    exit 1
  fi
  if dpkg --compare-versions "$debootstrap_ver" "<<" "$debootstrap_ver_required"; then
    if dpkg --compare-versions "$mmdebstrap_ver" "<<" "$mmdebstrap_ver_required"; then
      [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
      echo "Required debootstrap version: $debootstrap_ver_required"
      echo "Installed debootstrap version: $debootstrap_ver"
      echo "Required mmdebstrap version: $mmdebstrap_ver_required"
      echo "Installed mmdebstrap version: $mmdebstrap_ver"
      echo "You have to install debootstrap (version $debootstrap_ver_required or later) or mmdebstrap (verion $mmdebstrap_ver_required or later)."
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
      echo "Program terminated!"
      exit 1
    fi
  fi
  if [ "$batch_mode" = "no" ]; then
    echo -n "Press enter to continue... "
    read
  fi
} # End of create_live_required_debian_based_prompt
#
turn_on_ipv4_forward() {
  # Making the rules stick and load on boot:
  if grep -q "^net.ipv4.ip_forward" /etc/sysctl.conf 2>/dev/null; then
    perl -p -i -e "s/^net.ipv4.ip_forward.*/net.ipv4.ip_forward = 1/" /etc/sysctl.conf
  else
    echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
  fi
  # Turn on ip_forward now.
  if [ "$(cat /proc/sys/net/ipv4/ip_forward)" != "1" ]; then
    echo "Turn on ip_forward now."
    echo 1 > /proc/sys/net/ipv4/ip_forward
  else 
    echo "ip_forward is already on."
  fi
} # end of turn_on_ipv4_forward
#
ask_if_beginner_or_expert_mode(){
  local TMP mode
  # ocs_user_mode is global variable
  TMP="$(mktemp /tmp/menu-ocs.XXXXXX)"
  trap "[ -f "$TMP" ] && rm -f $TMP" HUP INT QUIT TERM EXIT
  $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
  "$msg_nchc_clonezilla" --menu "$msg_select_beginner_or_expert_mode:" \
  0 0 0 \
  "Beginner"  "$msg_beginner_mode" \
  "Expert"    "$msg_expert_mode" \
  "Exit"      "$msg_exit. $msg_enter_cml" \
  2> $TMP
  mode="$(cat $TMP)"
  [ -e "$TMP" ] && rm -f $TMP
  case "$mode" in
    "Beginner") ocs_user_mode="beginner" ;;
    "Expert")   ocs_user_mode="expert" ;;
    *)
      [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
      echo "$msg_program_stop!"
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
      exit 1
  esac
} # end of ask_if_beginner_or_expert_mode
#
rep_whspc_w_udrsc() {
  # Function to replace white space as "_", so in dialog we won't make it as 2 or more tags or items.
  local inp_txt="$1"
  local out_txt
  out_txt="$(echo ${inp_txt} | sed -r -e "s/[[:space:]]/_/g")"
  echo "$out_txt"
} # end of rep_whspc_w_udrsc
#
# Function copy_exec_drbl is borrowed from copy_exec from Debian's package initramfs-tools: /usr/share/initramfs-tools/hook-functions. The difference is that we use "cp -pL" instead of "ln -fs" in this function. This is because when we run mkpxeinitrd-net, we run cpio without "--dereference" (mkinitramfs uses cpio with "--dereference"), i.e. in mkpxeinitrd-net, we use:
 # find . | cpio --quiet -o -H newc | gzip -9 > $output_dir/initrd-$initrd_suffix.$kernel_ver.img )
 # instead of
 # find . | cpio --quiet --dereference -o -H newc | gzip -9 > $output_dir/initrd-$initrd_suffix.$kernel_ver.img )
 # The reason to do so is we use symbolic link to link the command to busybox in/usr/lib/mkpxeinitrd-net/initrd-skel/bin/. If we use --dereference, it will take a lot of space. This might be improved in the future.
 
# $1 is the source path (e.g. /usr/bin/time)
# $2 is the relative destination (e.g. /usr or /usr/time)
#
# The destination is interpreted in the same way "cp" would, meaning
# (assuming /bin is a directory):
#
#   "copy_exec_drbl /usr/bin/time /bin"        -> /bin/time
#   "copy_exec_drbl /usr/bin/time /bin/mytime" -> /bin/mytime
# 
# If $2 is left out, the same destination path as for the source arg will
# be used and directories will be created as needed, so:
#
#   "copy_exec_drbl /usr/bin/time"             -> /usr/bin/time
#
copy_exec_drbl() {
  local source target destination final_destination x nonoptlib
  local libname dirname
  
  source="${1}"
  if [ -n "${2}" ]; then
  	if [ ! -d "${DESTDIR}/${2}" ]; then
  		mkdir -p "${DESTDIR}/${2}"
  	fi
  	target="${2}"
  else
  	if [ ! -e "${DESTDIR}/$(dirname "${1}")" ]; then
  		mkdir -p "${DESTDIR}/$(dirname "${1}")"
  	fi
  	target="${1}"
  fi
  
  if [ -d "${DESTDIR}/${target}" ]; then
  	destination="${target}/$(basename "${source}")"
  else
  	destination="${target}"
  fi
  final_destination="${DESTDIR}/${destination}"
  
  if [ -L "$final_destination" ]; then
  	if [ $(readlink "${final_destination}") != "${source}" ]; then
  	  #	echo "W:copy_exec_drbl: Not copying ${source} to \$DESTDIR${destination}, which is already a copy of $(readlink ${final_destination})" >&2
  		return
  	fi
  else
  	cp -pL ${source} ${DESTDIR}/${destination}
  	if [ "${verbose}" = "y" ]; then
  		echo "Adding binary ${source}"
  	fi
  fi
  
  # Copy the dependant libraries
  for x in $(ldd ${source} 2>/dev/null | sed -e '
      /\//!d;
      /linux-gate/d;
      /=>/ {s/.*=>[[:blank:]]*\([^[:blank:]]*\).*/\1/};
      s/[[:blank:]]*\([^[:blank:]]*\) (.*)/\1/' 2>/dev/null); do
  
  	# Try to use non-optimised libraries where possible.
  	# We assume that all HWCAP libraries will be in tls,
  	# sse2, vfp or neon
  	nonoptlib=$(echo "${x}" | sed -e 's#/lib/\(tls\|i686\|sse2\|neon\|vfp\).*/\(lib.*\)#/lib/\2#')
  
  	if [ -e "${nonoptlib}" ]; then
  		x="${nonoptlib}"
  	fi
  
  	libname=$(basename "${x}")
  	dirname=$(dirname "${x}")
  
  	mkdir -p "${DESTDIR}/${dirname}"
  	if [ ! -e "${DESTDIR}/${dirname}/${libname}" ]; then
  		cp -pL "${x}" "${DESTDIR}/${dirname}"
  		if [ "${verbose}" = "y" ]; then
  			echo "Adding library ${x}"
  		fi
  	fi
  done
} # end of copy_exec_drbl
#
get_block_line_in_upstart_conf() {
  local CFG_FILE="$1"
  local comment_status="$2"
  local comment
  [ -e "$CFG_FILE" ] || exit 1
  # There are 2 types of init config:
  # (1)
  #    start on filesystem
  # (2)
  #    start on (local-filesystems
  #              and net-device-up IFACE=lo)
  # Wen can judge them by: grep -n -E "^start on[[:space:]]+\(" $CFG_FILE
  # Take /etc/init/gdm.conf as an example:
  # start on (filesystem
  # 	  and started hal
  # 	  and tty-device-added KERNEL=tty7
  # 	  and (graphics-device-added or stopped udevtrigger))
  # By using:
  # grep -n -E "^start on[[:space:]]+\(" gdm.conf
  # We can get the results like:
  # ------------
  # 9:start on (filesystem
  # ------------
  # grep -n -E -A 1000 "^start on[[:space:]]+\(" gdm.conf  | grep -E  "\)" | head -n 1
  # We can get the results like:
  # ------------
  # 12-       and (graphics-device-added or stopped udevtrigger))
  # ------------
  # so we know we can replace the one between line no. 9 and 12
  if [ "$comment_status" = "commented" ]; then
    comment="#"
  else
    comment=""
  fi
  if [ -z "$(LC_ALL=C grep -n -E "^${comment}[[:space:]]*start on[[:space:]]+\(" $CFG_FILE)" ]; then
    # Type 1
    begin_line="$(LC_ALL=C grep -n -E "^${comment}[[:space:]]*start on[[:space:]]+" $CFG_FILE | cut -d":" -f1)"
    end_line="${begin_line}"
  else
    # Type 2
    begin_line="$(LC_ALL=C grep -n -E "^${comment}[[:space:]]*start on[[:space:]]+\(" $CFG_FILE | cut -d":" -f1)"
    end_line="$(LC_ALL=C grep -n -E -A 1000 "^${comment}[[:space:]]*start on[[:space:]]+\(" $CFG_FILE | grep -E  "\)" | head -n 1 | cut -d "-" -f1)"
  fi
  echo "$begin_line $end_line"
} # end of get_block_line_in_upstart_conf
#
switch_upstart_service() {
  # The function to comment or uncomment the upstart /etc/init/*.conf 	 
  local CFG_F="$1"
  local mod_want="$2"  # "on" or "off"
  [ -z "$CFG_F" ] && "No 'CFG_F' assigned in function switch_upstart_service!" && exit 1
  [ -z "$mod_want" ] && "No 'mod_want' assigned in function switch_upstart_service!" && exit 1
  [ -e /etc/lsb-release ] && . /etc/lsb-release
  if [ "$DISTRIB_RELEASE" \< 13.10 ]; then
    # Ubuntu < 13.10
    # # Just edit the config file directly, so that it's could only be started manually. We can NOT just rename the *.conf. Otherwise the service can not be started manually in drbl-client-boot.conf.
    # If we want to turn on the service, the status now should be commented.
    case "$mod_want" in
     on)  status="commented";;
     off) status="not_commented";;
    esac
    lines="$(get_block_line_in_upstart_conf $CFG_F $status)"
    begin_line="$(echo $lines | awk -F" " '{print $1}')"
    end_line="$(echo $lines | awk -F" " '{print $2}')"
    case "$mod_want" in
     off) sub_cmd="if ($((begin_line))..$((end_line))) {s/^(.*)$/# \$1 # Modified by DRBL/g}" ;;
     on)  sub_cmd="if ($((begin_line))..$((end_line))) {s/^#[[:space:]]?(.*)$/\$1/g}" ;;
    esac
    perl -pi -e "$sub_cmd" $CFG_F

    # XXXXXXXXXXXXXXXXXXX This is wrong! If doing this, some required service could not be manually started in drbl-client-boot.conf.
    #case "$mod_want" in
    #  off) 
    #       if [ -e "${CFG_F}" ]; then
    #         mv ${CFG_F} ${CFG_F}.drbl-disabled
    #       fi
    #       ;;
    #  on)  
    #       if [ -e "${CFG_F}.drbl-disabled" ]; then
    #         mv ${CFG_F}.drbl-disabled ${CFG_F}
    #       fi
    #       ;;
    #esac
  else
    # Ubuntu 13.10 or later.
    # For upstart (>1.3) service, we can use override file (Ref: http://upstart.ubuntu.com/cookbook/#override-files)
    case "$mod_want" in
      off) echo "manual" > ${CFG_F/.conf/}.override;;
      on)  rm -f ${CFG_F/.conf/}.override;;
    esac
  fi
} # end of switch_upstart_service
#
canonical_hostname_prep() {
  # This function is used to avoid the bug of nfs-utils 1.2.2-1:
  # statd wont't work without reverse lookups. Therefore lockd will fail.
  # Ref: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=579397
  # The problem is not only on the server side, but also on the client side.
  local nfs_srv="$1"
  if ! host "$nfs_srv" &>/dev/null && \
     [ -z "$(LC_ALL=C  grep -Ew "^[[:space:]]*$nfs_srv" /etc/hosts )" ]; then
    echo "# Dummy NFS server lookup to avoid NFS statd/lockd issue. Created by Clonezilla." >> /etc/hosts
    echo "$nfs_srv nfs-server" >> /etc/hosts
  fi
} # end of canonical_hostname_prep
#
get_debian_ubuntu_init_serv_control_prog() {
  # Find to use update-rc.d or insserv in Debian or Ubuntu
  # dbn_ubn_serv_control_prog is global value
  [ -e /etc/lsb-release ] && . /etc/lsb-release
  dbn_ubn_serv_control_prog=""
  if [ "$DISTRIB_ID" = "Ubuntu" ]; then
     # Ubuntu, do not use insserv, otherwise it might confuse upstart and traditional rc
     dbn_ubn_serv_control_prog="use-update-rc-d"
  else
     # Debian, we check if insserv exists or not.
     if type insserv &>/dev/null; then
       dbn_ubn_serv_control_prog="use-insserv"
     else
       dbn_ubn_serv_control_prog="use-update-rc-d"
     fi
  fi
} # end of get_debian_ubuntu_init_serv_control_prog
#
get_sort_V_opt() {
  # A function to get if the "-V" option is supported on the system. This is because old version of sort does not support the option "-V", but newer one does.
  # Variable "sort_V_opt" is global variable.
  if [ -n "$(LC_ALL=C sort --help 2>&1 | grep -i -- "--version-sort")" ]; then
    # Check if version sorting option is supported. If so, use it.
    sort_V_opt="-V"
  fi
} # get_sort_V_opt
#
disable_apt_lang_translation() {
  local lang_cf_file="$1" # e.g. chroot/etc/apt/apt.conf.d/99lang
  if [ -z "$lang_cf_file" ]; then
    echo "No \"lang_cf_file\" in function disable_apt_lang_translation!"
    exit 1
  fi
  mkdir -p $(dirname $lang_cf_file)
  cat <<-APT_END > $lang_cf_file
Acquire
{
  Retries "0";
        Languages "none";
        Translation "none";
};
APT_END
} # end of disable_apt_lang_translation
#
get_latest_pkg_in_drbl_repository() {
  local branch pkg ktmp
  # pver is global variabl
  branch="$1" # e.g. live-experimental, unstable...
  pkg="$2"  # e.g. live-boot
  if [ -z "$branch" ]; then
    echo "No \$branch in function get_latest_pkg_in_repository!"
    exit 1
  fi
  if [ -z "$pkg" ]; then
    echo "No \$pkg in function get_latest_pkg_in_repository!"
    exit 1
  fi
  ktmp="$(mktemp -d /tmp/live_pver.XXXXXX || exit 1)"
    echo "Downloading $drbl_mirror_url/dists/drbl/$branch/binary-amd64/Packages.xz to finding latest $pkg version..."
    LC_ALL=C wget -q -P $ktmp/ $drbl_mirror_url/dists/drbl/$branch/binary-amd64/Packages.xz
    # The versions might be with epoch like:
    # 4.0.2-1.drbl15
    # 1:20170623.drbl1
    # Hence we add all of them as:
    # 0:4.0.2-1.drbl15
    # 1:20170623.drbl1
    pver="$(xzgrep -Ew -A 5 "^Package: $pkg([[:space:]]+|$)" $ktmp/Packages.xz | grep -E "^Version:" | sed -e "s/^Version: //g" | sed -r -e "s/^([^:]+)$/0:\1/g" | sort -V -r | uniq | head -n 1)"
    if [ -z "$pver" ]; then
      # Clean Packages.xz to avoid wget using another name like Packages.xz.1 then search the next again
      rm -f $ktmp/Packages.xz
      return 1
    fi
  if [ -n "$pver" ]; then
    # After the comparison is done, we have to change it back, i.e.,
    # 0:4.0.2-1.drbl15 -> 4.0.2-1.drbl15
    pver="$(echo $pver | sed -r -e "s/^0://g")"
  else
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "Warning!"
    echo "Unable to find the latest package version in $drbl_mirror_url/dists/$i/main/binary-amd64/Packages.xz."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo -n "$msg_press_enter_to_continue"
    read 
  fi
  [ -d "$ktmp" -a -n "$(echo $ktmp | grep "live_pver")" ] && rm -rf $ktmp
  return 0
} # end of get_latest_pkg_in_drbl_repository
#
gen_CDG_checksums() {
  # This function will generate Clonezilla, DRBL, GParted live checksum files, including MD5SUMS, SHA1SUMS, and a file called CHECKSUMS.TXT including MD5 and SHA1 checksums.
  local sum_file="CHECKSUMS.TXT"
  local sum_file_html="CHECKSUMS.php"
  local filetype="iso zip tar tar.gz"
  local sum_types="md5sum sha1sum sha256sum sha512sum b2sum b3sum"
  local sum_of
  echo -n "Creating checksums..."
  rm -f $sum_file $sum_file_html
  for jsum in $sum_types; do
    sum_of="$(echo $jsum | tr "[a-z]" "[A-Z]")S"  # e.g. md5sum -> MD5SUMS
    [ -e "$sum_of" ] && rm -f $sum_of
    for i in $filetype; do
      if [ -n "$(ls *.$i 2>/dev/null)" ]; then
        echo -n "."
        LC_ALL=C $jsum *.$i  >> $sum_of
      fi
    done
    echo "### ${sum_of}:" >> $sum_file
    cat ${sum_of} >> $sum_file
    echo >> $sum_file
  done
  echo " Done!"

  txt2html $sum_file > $sum_file_html
} # end of gen_CDG_checksums
#
find_next_release_version_number() {
  # Function to find the next release number in dir "$release_dir". This is used only for creating Clonezilla/DRBL/GParted live.
  local release_dir="$1"
  local next_v_major next_v_minor next_v_full
  # Default release dir is "release"
  [ -z "$release_dir" ] && release_dir="release"  
  # The dirs in release dir are like:
  # 2.0.0-28/
  # 2.0.0-29/
  # 2.0.0-30/
  # zip-dest/
  # zip-src/
  # Find the last version, i.e. 2.0.0-30
  version_now="$(LC_ALL=C find ./$release_dir/ -maxdepth 1 -type d -print 2>/dev/null | awk -F"/" '{print $3}' | grep -E "^[[:digit:]].*" | sort -r -V | uniq | head -n 1)"
  # Increase the minor # (i.e. 30) by 1
  if [ -n "$version_now" ]; then
    next_v_major="$(LC_ALL=C echo "$version_now" | awk -F "-" '{print $1}')"
    next_v_minor="$(LC_ALL=C echo "$version_now" | awk -F "-" '{print $2}')"
    next_v_minor="$((next_v_minor + 1))"
    next_v_full="$next_v_major-$next_v_minor"
  fi
  if [ -n "$next_v_major" -a -n "$next_v_minor" ]; then
    echo "$next_v_full"
    return 0
  else
    return 1
  fi
} # end of find_next_release_version_number
#
restore_lvm2_udevd_rules() {
  local new_fname reload_flag=false
  # Restore the udevd rules, which are disabled by ocs-lvm2-stop.
  echo "Checking if udevd rules have to be restored..."
  for i in /lib/udev/rules.d/*.drblsave; do
    [ ! -e "$i" ] && continue
    new_fname="$(echo $i | sed -r -e "s/\.drblsave$//g")"
    mv -v "$i" "$new_fname"
    reload_flag="true"
  done
  # Reload the rules for udevd
  if [ "$reload_flag" = "true" ]; then
    echo "Running 'udevadm control --reload-rules' to reload udevd rules..."
    udevadm control --reload-rules
  fi
} # End of restore_lvm2_udevd_rules

#
disable_lvm2_udevd_rules() {
  local node_rt="$1"  # E.g. /tftpboot/node_root/. If $node_rt is not assigned, it's for the running system. E.g. Clonezilla live. If assigned, it's for Clonezilla SE used normally.
  # 2012/Nov/20 Ubuntu's lvm2 has a udevd rules will automatically active VG, therefore before using "vgchange -an" to deactive the VG, we have to disable it, then restore it later.
  auto_active_rules="$(LC_ALL=C grep -Ew "^[^#].*vgchange -a y" $node_rt/lib/udev/rules.d/*.rules 2>/dev/null | awk -F":" '{print $1}')"
  if [ -n "$auto_active_rules" ]; then
    echo "Found udevd rule causes block devices with LVM signatures to be automatically added to their volume group."
    echo "Temporarily disable it otherwise the partition tool won't be able to inform the kernel the changes of partition table..."
    for i in $auto_active_rules; do
      mv -v "${i}" "${i}.drblsave"
    done
    # Reload the rules for udevd for running system, i.e. Clonezilla live. For Clonezilla SE, since it's in /tftpboot/node_root/, during the booting it won't be started.
    if [ -z "$node_rt" ]; then
      udevadm control --reload-rules
    fi
  fi
} # end of disable_lvm2_udevd_rules
#
is_systemd_init() {
  # Function to test if system is really using systemd by checking if /sbin/init is link to /lib/systemd/systemd.
  local real_init re_code
  if [ -x "/bin/systemctl" -a -d "/lib/systemd/system/" ]; then
    real_init="$(LC_ALL=C stat -c "%N" /sbin/init | awk -F"->" '{print $2}' | sed -r -e "s/^[[:space:]]*//g" -e "s/\`//g" -e "s/'//g")"
    if [ -n "$real_init" ]; then
      if [ "$(LC_ALL=C basename $real_init)" = "systemd" ]; then
        re_code=0
      else
        re_code=1
      fi
    else
      re_code=1
    fi
  else
    re_code=1
  fi
  return $re_code
} # end of is_systemd_init
#
check_if_system_support_ecryptfs(){
  local rc
  # Not really. It might be bulit-in
  # So let's check /proc/filesystems
  modprobe ecryptfs 2>/dev/null
  sleep 1
  if ! grep -Ewq "ecryptfs" /proc/filesystems; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "File system \"ecryptfs\" is not supported by the running Linux kernel \"`uname -r`\"" | tee --append ${OCS_LOGFILE}
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "$msg_program_stop." | tee --append ${OCS_LOGFILE}
    grand_jobs_before_exit
    exit 1
  fi
  if ! type mount.ecryptfs &>/dev/null; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "No \"ecryptfs\" related program was found on this system." | tee --append ${OCS_LOGFILE}
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "$msg_program_stop." | tee --append ${OCS_LOGFILE}
    my_ocs_exit 1
  fi
} # end of check_if_system_support_ecryptfs
#
task_ecryptfs_mount_point() {
  local task_type="$1"
  local pass1 pass2 ecryptfs_pf
  local TMP grc rc ask_ ans_ rc_bindfs ocs_ecryptfs_opt
  local enc_cmd_
  # ecrypt_mntpnt, bindfs_mntpnt, webdav_bindfs_flag, target_dir_orig and
  # target_dir, passwd_ecryptfs and passwd_file_ecryptfs are gloable variables.
  # Change the ocsroot to /tmp now since we will create the mount point in /tmp

  if `is_s3fs_ocsroot` || `is_cloudfuse_ocsroot`; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "Using ecryptfs with s3fs or cloudfuse has an issue." | tee --append ${OCS_LOGFILE}
    echo "Please check this URL for more info:" | tee --append ${OCS_LOGFILE}
    echo "https://github.com/s3fs-fuse/s3fs-fuse/issues/166" | tee --append ${OCS_LOGFILE}
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "$msg_program_stop!" | tee --append ${OCS_LOGFILE}
    exit 1
  fi
  check_if_system_support_ecryptfs
  # Define the ecryptfs option
  ocs_ecryptfs_opt="ecryptfs_cipher=$ocs_ecryptfs_cipher,ecryptfs_key_bytes=$ocs_ecryptfs_key_bytes,no_sig_cache,ecryptfs_enable_filename_crypto=n,ecryptfs_passthrough"
  ###
  ecrypt_mntpnt="$(mktemp -d /tmp/ecryptfs_mnt.XXXXXX)"
  ecryptfs_pf=$(mktemp /tmp/ecryptfs_f.XXXXXX)
  # Force to set the mode
  chmod 600 $ecryptfs_pf
  TMP=$(mktemp /tmp/ecryptfs_tmp.XXXXXX)
  trap "[ -f "$TMP" ] && rm -f $TMP" HUP INT QUIT TERM EXIT
  grc="1" # grand rc for the really working return code
  # Collect the password for ecryptfs. This is because for ecryptfs it only 
  # ask once, no confirmation.

  while [ "$grc" -ne 0 ]; do
    if [ -z "$passwd_ecryptfs" -a -z "$passwd_file_ecryptfs" ]; then
      # Not spedified by user. Ask passwd_ecryptfs
      rc="1"
      echo $msg_delimiter_star_line | tee --append ${OCS_LOGFILE}
      case "$task_type" in
       *save*) 
              # For saving, we ask twice.
              [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING | tee --append ${OCS_LOGFILE}
  	    echo "$msg_remember_passphrase_of_ecryptfs" | tee --append ${OCS_LOGFILE}
              [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL | tee --append ${OCS_LOGFILE}
  	    echo -e "*** $msg_enter_passphrase_to_encrypt_img: ${target_dir} ***\n($msg_it_will_not_be_echoed)" | tee --append ${OCS_LOGFILE}
              read -s pass1
  	    echo -e "*** $msg_reenter_passphrase_to_encrypt_img: ${target_dir} ***\n($msg_it_will_not_be_echoed)" | tee --append ${OCS_LOGFILE}
              read -s pass2
              while [ "$pass1" != "$pass2" ]; do
                [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
                echo "$msg_passphrases_not_match" | tee --append ${OCS_LOGFILE}
                [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  	      echo -e "*** $msg_enter_passphrase_to_encrypt_img: ${target_dir} ***\n($msg_it_will_not_be_echoed)" | tee --append ${OCS_LOGFILE}
                read -s pass1
  	      echo -e "*** $msg_reenter_passphrase_to_encrypt_img: ${target_dir} ***\n($msg_it_will_not_be_echoed)" | tee --append ${OCS_LOGFILE}
                read -s pass2
              done
              if [ -z "$pass1" ]; then
                [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  	        echo "$msg_passphrase_empty" | tee --append ${OCS_LOGFILE}
                [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
                echo "$msg_program_stop!" | tee --append ${OCS_LOGFILE}
  	        my_ocs_exit 1
              fi
              # set the matched passphrase
              passwd_ecryptfs="$pass1"
              ;;
          *)
              # For restoring, we ask once only.
  	    echo -e "*** $msg_enter_passphrase_for_decrypt_img: ${target_dir} ***\n($msg_it_will_not_be_echoed)" | tee --append ${OCS_LOGFILE}
              read -s passwd_ecryptfs
              ;;
      esac
    fi
    # Now at least there is passwd_ecryptfs or passwd_file_ecryptfs
    if [ -n "$passwd_ecryptfs" ]; then
      # Put it in the file
      echo "passphrase_passwd=$passwd_ecryptfs" > $ecryptfs_pf
    elif [ -e "$passwd_file_ecryptfs" ]; then
      cat $passwd_file_ecryptfs > $ecryptfs_pf
    else
      [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
      echo "Not password for ecryptfs was inputted or assigned in a file." | tee --append ${OCS_LOGFILE}
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
      echo "$msg_program_stop!" | tee --append ${OCS_LOGFILE}
      my_ocs_exit 1
    fi

    #
    webdav_bindfs_flag="no"
    ask_="true"
    #
    while [ "$ask_" = "true" ]; do
      # If ocsroot is webdav, we have to use bindfs as the middle layer.
      # Reason: eCryptFS belongs to a class of pseudo-filesystems, i.e. file systems that run on top of a layer of conventional FS. But davfs2 refers to the network stack-based file systems that are not compatible with eCryptFS. Therefore it is necessary to use fs-wrapper - bindfs. It will hide all incompatibilities though cause some inconvenience.
      # Ref: http://www.linux.org.ru/wiki/en/WebDav%2Be%D0%A1ryptFS
      #      https://bugs.launchpad.net/ecryptfs/+bug/277578/comments/25
      if `is_davfs_ocsroot`; then
        bindfs_mntpnt="$(mktemp -d /tmp/bindfs_mnt.XXXXXX)"
	bindfs "$ocsroot/${target_dir}" $bindfs_mntpnt
	rc_bindfs="$?"
	if [ "$rc_bindfs" -eq 0 ]; then
          webdav_bindfs_flag="yes"
	  enc_cmd_="LC_ALL=C mount -t ecryptfs $bindfs_mntpnt $ecrypt_mntpnt -o $ocs_ecryptfs_opt,key=passphrase:passphrase_passwd_file=$ecryptfs_pf"
	  echo "Running: $enc_cmd_"
	  eval $enc_cmd_
          rc="$?"
        else
          [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
          echo "Failed to bindfs WebDAV image by:" | tee --append ${OCS_LOGFILE}
	  echo "bindfs \"$ocsroot/${target_dir}\" $bindfs_mntpnt" | tee --append ${OCS_LOGFILE}
          [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
          echo "$msg_program_stop" | tee --append ${OCS_LOGFILE}
          [ "$save_restore_error_log" = "yes" ] && copy_error_log
          exit 1
        fi
      else
        enc_cmd_="LC_ALL=C mount -t ecryptfs \"$ocsroot/${target_dir}\" \"$ecrypt_mntpnt\" -o $ocs_ecryptfs_opt,key=passphrase:passphrase_passwd_file=$ecryptfs_pf"
	echo "Running: $enc_cmd_"
	eval $enc_cmd_
        rc="$?"
      fi
      # Even wrong passphrase could give rc=0. However, the data are not really
      # decrypted. Therefore we have to use another method to check.
      if [ "$rc" -ne 0 ]; then
        # Pause so that user can read the error message
        echo -n "$msg_press_enter_to_continue..."
        read
        $DIA --backtitle "$msg_nchc_free_software_labs" --title "$msg_nchc_clonezilla" \
        --yesno "$msg_failed_to_encrypt_img\n$msg_do_u_want_to_do_it_again" 0 0
        ans_="$?"
        case "$ans_" in
          0) # yes is chosen
             ask_="true";;
          1) # no is chosen
             echo "$msg_program_stop!" | tee --append ${OCS_LOGFILE}
             [ -f "$TMP" ] && rm -f $TMP
             [ -f "$ecryptfs_pf" ] && rm -f $ecryptfs_pf
             my_ocs_exit 1;;
        esac
      else
        # Got the one we want
        ask_="false"
        # Do not keep the file on system. For security.
        [ -f "$ecryptfs_pf" ] && rm -f $ecryptfs_pf
      fi
    done
    if [ -z "$(echo "$task_type" | grep -e "save")" ]; then
      # Image exists already.
      # Check if the image really decrypted correctly by testing file "clonezilla-img". This is only for restoring
      # The results of "file -Lbi clonezilla-img" might be charset=utf-8 or us-ascii, or even others. Therefore just check it not binary and grep a line.
      if [ -z "$(LC_ALL=C file -Lbi "${ecrypt_mntpnt}/clonezilla-img" | grep -Ew "charset=binary")" -a \
           -n "$(grep -e "^This image was saved by Clonezilla" "${ecrypt_mntpnt}/clonezilla-img")" ]; then 		   
        grc=0
        [ "$BOOTUP" = "color" ] && $SETCOLOR_SUCCESS
        echo "$msg_succeed_to_decrypt_img: ${target_dir}" | tee -a $OCS_LOGFILE
        [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
        echo $msg_delimiter_star_line | tee -a $OCS_LOGFILE
      else
        [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
        echo "$msg_failed_to_decrypt_img: ${target_dir} " | tee -a $OCS_LOGFILE
        [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
	umount $ecrypt_mntpnt
	if [ "$webdav_bindfs_flag" = "yes" ]; then
	  umount $bindfs_mntpnt 2>/dev/null
        fi
        grc=1
        confirm_continue_or_not_default_continue
	# Reset the value passwd_ecryptfs and passwd_file_ecryptfs so user can input it again
	passwd_ecryptfs=""
	passwd_file_ecryptfs=""
      fi
    else
      # For saving task, the return code for "mount -t ecryptfs" can be used.
      # Since the above while loop is done, it means monting is OK now.
      grc=0
    fi
  done
  [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
  echo "$msg_encrypt_img_dir_is_now_as: ${ecrypt_mntpnt}" | tee -a $OCS_LOGFILE
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  if [ "$ocs_sr_mode" = "interactive" ]; then
    sleep 3
  fi
  # Save the original ocsroot for later use
  ocsroot_orig="$ocsroot"
  ocsroot="$(dirname ${ecrypt_mntpnt})"
  # Save the original image dir for later use
  target_dir_orig="${target_dir}"
  target_dir="$(basename "${ecrypt_mntpnt}")"
  #
  [ -f "$TMP" ] && rm -f $TMP
  return $grc
} # end of task_ecryptfs_mount_point
#
umount_ecryptfs_mount_point_if_necessary(){
  local rc rc_bindfs
  if [ "$encrypt_ocs_img" = "yes" ]; then
    if [ -n "$ecrypt_mntpnt" ]; then
      umount $ecrypt_mntpnt 2>/dev/null
      rc=$?
      if [ "$rc" -eq 0 ]; then
        if [ -d "$ecrypt_mntpnt" -a \
             -n "$(echo "$ecrypt_mntpnt" | grep -w "ecryptfs_mnt")" ]; then
	  # It's just a mounting point. Better not to use "rm -rf" in case wrongly remove all the dir.
          rmdir "$ecrypt_mntpnt"
        fi
      fi
      if [ "$webdav_bindfs_flag" = "yes" ]; then
        umount $bindfs_mntpnt 2>/dev/null
        rc_bindfs=$?
        if [ -d "$bindfs_mntpnt" -a \
             -n "$(echo "$bindfs_mntpnt" | grep -w "bindfs_mnt")" ]; then
	  # It's just a mounting point. Better not to use "rm -rf" in case wrongly remove all the dir.
          rmdir "$bindfs_mntpnt"
        fi
      fi
    fi
  fi
} # end of umount_ecryptfs_mount_point_if_necessary
#
is_ecryptfs_img() {
  local tgt_dir rc_enc
  tgt_dir_abs="$1"  # absolute path
  rc_enc="1"
   if [ -e "${tgt_dir_abs}/ecryptfs.info" ] && \
      [ -n "$(LC_ALL=C file -Lbi "${tgt_dir_abs}/clonezilla-img" | grep -Ew "charset=binary")" ]; then 		   
     rc_enc="0"
   fi
   return $rc_enc
} # end of is_ecryptfs_img
#
grand_jobs_before_exit() {
  # This function is used to collect the jobs before program aborting.
  # Including:
  # (1) Unmount ecryptfs if it exists.
  # (2) Remove MULTIPATH_INFODIR temp dir.
  # (3) Remove partition_table from gen_proc_partitions_map_file

  #(1)
  umount_ecryptfs_mount_point_if_necessary

  #(2)
  if [ -d "$MULTIPATH_INFODIR" -a \
       -n "$(echo $MULTIPATH_INFODIR | grep -w "multipath_info")" ]; then
    rm -f "$MULTIPATH_INFODIR/*"
    rmdir $MULTIPATH_INFODIR
  fi
  #(3)
  if [ -f "$partition_table" -a \
       -n "$(echo $partition_table | grep -w "parttable-ocs")" ]; then
    rm -f $partition_table
  fi
} # end of grand_jobs_before_exit
#
my_ocs_exit() {
  local ec="$1"
  grand_jobs_before_exit
  exit $ec
} # end of my_ocs_exit
#
drbl_service_ctl() {
  # Function to start/stop service, for systemd or sysv/upstart
  local srv_name="$1"
  local srv_action="$2"  # start, stop, and restart only
  if [ -n "$srv_name" -a -n "$srv_action" ]; then
    if is_systemd_init && [ -e "/lib/systemd/system/${srv_name}.service" ]; then
      systemctl $srv_action $srv_name
    else
      service $srv_name $srv_action
    fi
  fi
} # end of drbl_service_ctl
#
get_grub_efi_image_block() {
  local IMG_NAME="$1"
  local GRUB_CONF_TMP="$2"
  [ -z "$IMG_NAME" ] && exit 1
  # By using
  # grep -Ei -n '^[[:space:]]*menuentry[[:space:]]+.*([[:space:]]|$)+' /tftpboot/nbi_img/grub/grub.cfg | grep -A1 -E "menuentry[[:space:]]+.*--id drbl-client([[:space:]]|$)+"
  # 29:menuentry "CentOS 7.1.1503 Linux (DRBL mode, mostly local resources)" {
  # 34:menuentry 'Clonezilla' {
  # so we know we can replace the one between line no. 29 and 34
  if [ -n "$GRUB_CONF_TMP" -a ! -e "$GRUB_CONF_TMP" ]; then
    return 2
  fi
  between_lines="$(LC_ALL=C grep -Ei -n -- "^[[:space:]]*[#]*menuentry[[:space:]]+.*([[:space:]]|$)+" $GRUB_CONF_TMP | grep -Ei -A1 -- "menuentry[[:space:]]+.*$IMG_NAME([[:space:]]|$)+" | cut -d":" -f1)"
  begin_line="$(LC_ALL=C echo $between_lines | awk -F" " '{print $1}')"
  end_line="$(LC_ALL=C echo $between_lines | awk -F" " '{print $2}')"
  # if end_line is nothing, it must be the last block, i.e. we can not find the next [.*]
  if [ -z "$end_line" ]; then
    end_line="$(LC_ALL=C wc -l $GRUB_CONF_TMP | awk -F" " '{print $1}')"
  else
    # if not nothing, backword one line
    end_line="$(($end_line - 1))"
  fi
  echo "$begin_line $end_line"
} # end of get_grub_efi_image_block
#
set_specific_host_grub_efi_conf() {
  local HOSTS="$*"
  local grub_eficfg grub_eficfg_MAC grub_eficfg_MIP OCS_TMP IP
  # prepare the HOSTNAME-IP-MAC table
  OCS_TMP=`mktemp /tmp/ocs_clean_tmp.XXXXXX`
  trap "[ -f "$OCS_TMP" ] && rm -f $OCS_TMP" HUP INT QUIT TERM EXIT
  parse_dhcpd_conf $OCS_TMP

  for ih in $HOSTS; do
    case "$ih" in
      *.*.*.*)
        # list by IP
	# the grub_eficfg will like "grub.cfg-drbl-192.168.177.2"
	grub_eficfg="grub.cfg-drbl-${ih}"
        # These files look like: grub.cfg-drbl:$MAC, e.g., grub.cfg-drbl-88:aa:bb:cc:dd:ee
	# We'd better to clean the grub.cfg-drbl:$MAC if it exists since maybe it's created by ocsmgrd when received the results from client in the previous save/restoration. Since grub.cfg-drbl:$MAC has higher priority than "C0A80001" style file in pxelinux, this is a must if we can find it, we have to remove it.
	# TODO: What if no MAC address setting in dhcpd.conf ? Then $OCS_TMP will be empty, then... ?
        grub_eficfg_MAC="grub.cfg-drbl-$(grep ${ih} $OCS_TMP | awk -F" " '{print $3}')"
        [ -f "$GRUB_EFINB_DIR/$grub_eficfg_MAC" ] && rm -f $GRUB_EFINB_DIR/$grub_eficfg_MAC
        ;;
      *:*:*:*:*:*)
        # list by MAC
	# for an Ethernet (ARP type 1) with address 88:99:AA:BB:CC:DD it would search for the filename grub.cfg-drbl-88:99:aa:bb:cc:dd (lowercase)
	grub_eficfg="$(echo $ih | tr "[A-Z]" "[a-z]")"
	# append "grub.cfg-drbl-" in the beginning
	grub_eficfg="grub.cfg-drbl-$grub_eficfg"
	# We'd better to clean the IP-based setting file if it exists since maybe it's created by ocsmgrd when received the results from client in the previous save/restoration. Although grub.cfg-drbl-$MAC has higher priority than "grub.cfg-drbl-C0A80001" style file in grub_efi, this NOT a must if we can find it, but we remove it to avoid confusion.
        IP="$(grep -E ${ih} $OCS_TMP | awk -F" " '{print $2}')"
	grub_eficfg_MIP="grub.cfg-drbl-${IP}"
        [ -f "$GRUB_EFINB_DIR/$grub_eficfg_MIP" ] && rm -f $GRUB_EFINB_DIR/$grub_eficfg_MIP
        ;;
    esac
    echo -n "Generate the grub uEFI netboot config file for host $ih ... "
    cp -f $GRUB_EFINB_DIR/grub.cfg_skeleton $GRUB_EFINB_DIR/$grub_eficfg
    echo "done!"
  done
  [ -f "$OCS_TMP" ] && rm -f $OCS_TMP
} # end of set_specific_host_grub_efi_conf
#
check_entryid_in_grub_efi_cfg() {
  local ENTRY_ID="$1"
  local GRUB_CONF_TMP="$2"
  if [ -z "$ENTRY_ID" ]; then
     [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
     echo "You must specify the image name! Program terminated!!!"
     [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
     exit 1
  fi
  if [ -n "$GRUB_CONF_TMP" -a ! -e "$GRUB_CONF_TMP" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "File $GRUB_CONF_TMP not found. No support for uEFI network boot."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 2
  fi
  if ! grep -Eiq "^[[:space:]]*menuentry[[:space:]]+.*--id $ENTRY_ID" $GRUB_CONF_TMP; then
     [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
     echo "Unable to find the menuentry ($ENTRY_ID) ID! Make sure the $ENTRY_ID is labeled in $GRUB_CONF_TMP! Program terminated!!!"
     [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
     exit 1
  fi
} # end of check_entryid_in_grub_efi_cfg
#
sub_default_grub_efi_img() {
  local ENTRY_ID="$1"  # E.g. drbl-client, clonezilla-se-client
  local GRUB_CONF_TMP="$2"
  local ENTRY_LABEL="$3"
  local lines begin_line end_line
  if [ -n "$GRUB_CONF_TMP" -a ! -e "$GRUB_CONF_TMP" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "File $GRUB_CONF_TMP not found. No support for uEFI network boot."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 2
  fi
  check_entryid_in_grub_efi_cfg "$ENTRY_ID" $GRUB_CONF_TMP
  # Set default menu and update the menuentry 
  perl -pi -e "s|^set default=.*|set default=$ENTRY_ID|g" $GRUB_CONF_TMP

  lines="$(get_grub_efi_image_block "--id $ENTRY_ID" $GRUB_CONF_TMP)"
  begin_line="$(echo $lines | awk -F" " '{print $1}')"
  end_line="$(echo $lines | awk -F" " '{print $2}')"

  if [ -n "$ENTRY_LABEL" ]; then
    echo The MENUENTRY LABEL is \"$ENTRY_LABEL\"
    # menuentry "Clonezilla" --id clonezilla-se-client {
    # ->
    # menuentry "Clonezilla: multicast restore precise-x86-20150504 to disk sda " --id clonezilla-se-client {
    sub_menu_label_cmd="if ($begin_line..$end_line) {s|^[[:space:]]*menuentry .*|menuentry \"$ENTRY_LABEL\" --id $ENTRY_ID \{|i}"
    perl -pi -e "$sub_menu_label_cmd" $GRUB_CONF_TMP
  fi
} # end of sub_default_grub_efi_img
#
add_opt_in_pxelinux_cfg_block() {
  # add something like: ocs_opt="--language 0  -g auto -p true restoredisk 2disks hda hdb" in pxelinux config file
  local prot_dq="\\\""  # protection double quotation for later use.
  while [ $# -gt 0 ]; do
    case "$1" in
      -n|--no-dq) shift; prot_dq="" ;;
      -*)     echo "${0}: ${1}: invalid option in function add_opt_in_pxelinux_cfg_block"
              echo "$msg_program_stop"
              [ "$save_restore_error_log" = "yes" ] && copy_error_log
              exit 2 ;;
      *)      break ;;
    esac
  done
  local label="$1"
  local opt_name="$2" # can be ocs_opt (for NFSRoot-based Clonezilla client) or ocs_live_run (for Clonezilla-live-based client)
  local opt_content="$3"
  local tag_found
  [ -z "$label" ] && echo "No label in add_opt_in_pxelinux_cfg_block!" && exit 1
  [ -z "$opt_name" ] && echo "opt_name NOT specified in add_opt_in_pxelinux_cfg_block! Abort!" && exit 1
  [ -z "$opt_content" ] && echo "opt_content NOT specified in add_opt_in_pxelinux_cfg_block! Abort!" && exit 1
  # Make sure there is no white space in the end of opt_content, i.e. e.g.
  # "clonezilla -l en_US.UTF-8 -p reboot -k  " -> "clonezilla -l en_US.UTF-8 -p reboot -k"
  # Otherwise it might cause the boot parameters to be wrongly parsed, i.e. the boot parameters:
  # ocs_live_run="clonezilla -l en_US.UTF-8 -p reboot -k  " net.ifnames=0
  # is wrongly parsed by Linux kernel 4.1 so that net.ifnames=0 won't take effect.
  opt_content="$(LC_ALL=C echo "$opt_content" | sed -r -e "s/[[:space:]]*$//g")"
  lines="$(get_pxecfg_image_block $label $PXE_CONF)"
  begin_line="$(echo $lines | awk -F" " '{print $1}')"
  end_line="$(echo $lines | awk -F" " '{print $2}')"
  if [ -z "$begin_line" -o -z "$end_line" ]; then
    echo "No \"$label\" found in $PXE_CONF, skip adding that."
    return 1
  fi
  tag_found="$(LC_ALL=C head -n $end_line $PXE_CONF | tail -n $(($end_line-$begin_line)) | grep -Eiw "^[[:space:]]*append[[:space:]]*.*[[:space:]]+$opt_name=.*([[:space:]]+|$)")"
  if [ -z "$tag_found" ]; then
    # append ocs_opt=... in the end of append kernel parameter.
    sub_menu_label_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*append[[:space:]]+.*)|\$1 $opt_name=${prot_dq}${opt_content}${prot_dq}|i}"
    LC_ALL=C perl -pi -e "$sub_menu_label_cmd" $PXE_CONF
  else
    # overwrite existing ocs_opt=...
    # ocs_opt must be the last parameters in default append for pxelinux.
    # If tag if found, 3 cases: (1) with "" (e.g. ocs_daemonon="ssh", (2) without "" (e.g. ocs_daemonon=ssh)
    # (3) nothing (except space) after =, e.g. 'ocs_daemonon='
    if [ -n "$(echo $tag_found | grep -iE "$opt_name=\"[^\"]*\"")" ]; then
      # case 1, e.g. ocs_daemonon="ssh"
      sub_menu_label_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*append[[:space:]]*.*)[[:space:]]+$opt_name=\"[^\"]*\"([[:space:]]+.*$)|\$1 $opt_name=${prot_dq}${opt_content}${prot_dq}\$2|i}"
    else
      if [ -n "$(echo $tag_found | grep -iE "$opt_name=[^[:space:]]+")" ]; then
        # case 2, e.g. ocs_daemonon=ssh
        sub_menu_label_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*append[[:space:]]*.*)[[:space:]]+$opt_name=[^[:space:]]+([[:space:]]+.*$)|\$1 $opt_name=${prot_dq}${opt_content}${prot_dq}\$2|i}"
      else
        # case 3, e.g. 'ocs_daemonon=', normally this is for 'locales=' or 'keyboard-layouts='
        sub_menu_label_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*append[[:space:]]*.*)[[:space:]]+$opt_name=[[:space:]]+(.*$)|\$1 $opt_name=${prot_dq}${opt_content}${prot_dq} \$2|i}"
      fi
    fi
    LC_ALL=C perl -pi -e "$sub_menu_label_cmd" $PXE_CONF
  fi
} # end of add_opt_in_pxelinux_cfg_block
#
remove_opt_in_pxelinux_cfg_block() {
  local label="$1"
  local opt_name="$2" # can be ocs_opt (for NFSRoot-based Clonezilla client) or ocs_live_run (for Clonezilla-live-based client)
  local tag_found
  [ -z "$label" ] && echo "No label in remove_opt_in_pxelinux_cfg_block!" && exit 1
  # remove something like ocs_opt=... from the append .... like this in pxelinux config:
  # append ... ocs_opt="--language 0  -g auto -p true restoredisk 2disks hda hdb"...
  lines="$(get_pxecfg_image_block $label $PXE_CONF)"
  begin_line="$(echo $lines | awk -F" " '{print $1}')"
  end_line="$(echo $lines | awk -F" " '{print $2}')"
  if [ -z "$begin_line" -o -z "$end_line" ]; then
    echo "No \"$label\" found in $PXE_CONF, skip removing that."
    return 1
  fi
  # 2 types of boot parameters, 1st one is with "=" (e.g. ocs_opt=...), the 2nd one is without "=" (e.g. quiet). Here first we test if the one with "=" is found or not.
  tag_found="$(LC_ALL=C head -n $end_line $PXE_CONF | tail -n $(($end_line-$begin_line)) | grep -Eiw "^[[:space:]]*append[[:space:]]*.*[[:space:]]+$opt_name=.*([[:space:]]+|$)")"
  if [ -n "$tag_found" ]; then
    # 1st type, i.e. with "=". 3 types of them. 
    # (1) with ", e.g. ocs_live_run="ocs-live-general"
    # (2) without ", e.g. ocs_live_run=ocs-live-general
    # (3) without " and nothing after '=', e.g. 'ocs_live_run='

    # (1) with ", e.g. ocs_live_run="ocs-live-general"
    sub_menu_label_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*append[[:space:]]+.*)[[:space:]]+$opt_name=\"[^\"]*\"([[:space:]]+.*)|\$1\$2|i}"
    LC_ALL=C perl -pi -e "$sub_menu_label_cmd" $PXE_CONF
    # (2) without ", e.g. ocs_live_run=ocs-live-general
    sub_menu_label_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*append[[:space:]]+.*)[[:space:]]+$opt_name=[^[:space:]]+([[:space:]]+.*)|\$1\$2|i}"
    LC_ALL=C perl -pi -e "$sub_menu_label_cmd" $PXE_CONF
    # (3) without " and nothing after '=', e.g. 'ocs_live_run='
    sub_menu_label_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*append[[:space:]]+.*)[[:space:]]+$opt_name=[[:space:]]+(.*)|\$1 \$2|i}"
    LC_ALL=C perl -pi -e "$sub_menu_label_cmd" $PXE_CONF
  else
    # 2nd type, i.e. without "=", or nothing. Even if nothing, perl won't fail. Therefore just run it.
    sub_menu_label_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*append[[:space:]]+.*)[[:space:]]+$opt_name([[:space:]]+.*)|\$1\$2|i}"
    LC_ALL=C perl -pi -e "$sub_menu_label_cmd" $PXE_CONF
  fi
} # end of remove_opt_in_pxelinux_cfg_block()
#
override_opt_in_pxelinux_cfg_block() {
  # Function to override all the boot parameters. E.g.
  # kernel vmlinuz-pxe
  # append initrd=initrd-pxe.img devfs=nomount drblthincli=off quiet
  local update_mode
  update_mode="append"  # By default this function is used to update the line begin with "append"
  while [ $# -gt 0 ]; do
    case "$1" in
      -k|--kernel) shift; update_mode="kernel" ;;
      -*)     echo "${0}: ${1}: invalid option in function add_opt_in_pxelinux_cfg_block"
              echo "$msg_program_stop"
              [ "$save_restore_error_log" = "yes" ] && copy_error_log
              exit 2 ;;
      *)      break ;;
    esac
  done
  local label="$1"
  local all_opts="$2" # all the boot parameters
  [ -z "$label" ] && echo "No label in override_opt_in_pxelinux_cfg_block!" && exit 1
  lines="$(get_pxecfg_image_block $label $PXE_CONF)"
  begin_line="$(echo $lines | awk -F" " '{print $1}')"
  end_line="$(echo $lines | awk -F" " '{print $2}')"
  if [ -z "$begin_line" -o -z "$end_line" ]; then
    echo "No \"$label\" found in $PXE_CONF, skip overwriding that."
    return 1
  fi
  sub_menu_label_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*${update_mode}[[:space:]]+).*$|\$1$all_opts|i}"
  LC_ALL=C perl -pi -e "$sub_menu_label_cmd" $PXE_CONF
} # end of override_opt_in_pxelinux_cfg_block
#
get_status_grub_efi_cfg_block() {
  local ENTRY_ID="$1"
  local GRUB_CONF_TMP="$2"
  local lines begin_line end_line rc block_status
  [ -z "$ENTRY_ID" -o -z "$GRUB_CONF_TMP" ] && return 1
  if [ -n "$GRUB_CONF_TMP" -a ! -e "$GRUB_CONF_TMP" ]; then
    return 2
  fi
  lines="$(get_grub_efi_image_block "--id $ENTRY_ID" $GRUB_CONF_TMP)"
  begin_line=$(echo $lines | awk -F" " '{print $1}')
  end_line=$(echo $lines | awk -F" " '{print $2}')  # end_line is useless in this function. Just keep it for completion
  if [ -n "$(LC_ALL=C sed -n "${begin_line}p" $GRUB_CONF_TMP | grep -E "^#menuentry")" ]; then
  # Found something like:
  # #menuentry "Clonezilla" --id clonezilla-se-client {
  # so it's disabled.
    block_status="hide"
  else
    block_status="reveal"
  fi
  echo "$block_status"
} # end of get_status_grub_efi_cfg_block
#
add_opt_in_grub_efi_cfg_block() {
  # add something like: ocs_opt=\"--language 0  -g auto -p true restoredisk 2disks hda hdb\" in grub efi nb config file
  local prot_dq="\\\\\""  # protection double quotation for later use.
  local status_saved
  while [ $# -gt 0 ]; do
    case "$1" in
      -n|--no-dq) shift; prot_dq="" ;;
      -*)     echo "${0}: ${1}: invalid option in function add_opt_in_grub_efi_cfg_block"
              echo "$msg_program_stop"
              [ "$save_restore_error_log" = "yes" ] && copy_error_log
              exit 2 ;;
      *)      break ;;
    esac
  done
  local entry_id="$1" # e.g. "clonezilla-se-client"
  local opt_name="$2" # can be ocs_opt (for NFSRoot-based Clonezilla client) or ocs_live_run (for Clonezilla-live-based client)
  local opt_content="$3"
  local tag_found
  local sub_menu_entry_cmd
  [ -z "$entry_id" ] && echo "No entry_id in add_opt_in_grub_efi_cfg_block!" && exit 1
  [ -z "$opt_name" ] && echo "opt_name NOT specified in add_opt_in_grub_efi_cfg_block! Abort!" && exit 1
  [ -z "$opt_content" ] && echo "opt_content NOT specified in add_opt_in_grub_efi_cfg_block! Abort!" && exit 1
  if [ -n "$GRUB_CONF" -a ! -e "$GRUB_CONF" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "File $GRUB_CONF not found. No support for uEFI network boot."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 2
  fi
  # Before adding option, we have to enable it because with grub there is no
  # way to hide unless with use # to comment the whole menuentry.
  # Save the status first
  status_saved="$(get_status_grub_efi_cfg_block "$entry_id" $GRUB_CONF)"
  hide_reveal_grub_efi_ent "$entry_id" reveal $GRUB_CONF
  #
  lines="$(get_grub_efi_image_block "--id $entry_id" $GRUB_CONF)"
  begin_line="$(echo $lines | awk -F" " '{print $1}')"
  end_line="$(echo $lines | awk -F" " '{print $2}')"
  if [ -z "$begin_line" -o -z "$end_line" ]; then
    echo "No \"$entry_id\" found in $GRUB_CONF, skip adding that."
    return 1
  fi
  tag_found="$(LC_ALL=C head -n $end_line $GRUB_CONF | tail -n $(($end_line-$begin_line)) | grep -Eiw "^[[:space:]]*$linux_cmd[[:space:]]*.*[[:space:]]+$opt_name=.*([[:space:]]+|$)")"
  if [ -z "$tag_found" ]; then
    # append ocs_opt=... in the end of linux kernel parameter.
    sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*\\\$linux_cmd[[:space:]]+.*)|\$1 $opt_name=${prot_dq}${opt_content}${prot_dq}|i}"
    LC_ALL=C perl -pi -e "$sub_menu_entry_cmd" $GRUB_CONF
  else
    # overwrite existing ocs_opt=...
    # ocs_opt must be the last parameters in default append for grub efi nb.
    # If tag if found, 3 cases: (1) with "" (e.g. ocs_daemonon="ssh", (2) without "" (e.g. ocs_daemonon=ssh),
    # (3) nothing (except space) after =, e.g. 'ocs_daemonon='
    if [ -n "$(echo $tag_found | grep -iE "$opt_name=\\\\\"[^\"]*\\\\\"")" ]; then
      # case 1, e.g. ocs_daemonon="ssh"
      sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*\\\$linux_cmd[[:space:]]*.*)[[:space:]]+$opt_name=\"[^\"]*\"([[:space:]]+.*$)|\$1 $opt_name=${prot_dq}${opt_content}${prot_dq}\$2|i}"
    else
      if [ -n "$(echo $tag_found | grep -iE "$opt_name=[^[:space:]]+")" ]; then
        # case 2, e.g. ocs_daemonon=ssh
        sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*\\\$linux_cmd[[:space:]]*.*)[[:space:]]+$opt_name=[^[:space:]]+([[:space:]]+.*$)|\$1 $opt_name=${prot_dq}${opt_content}${prot_dq}\$2|i}"
      else
        # case 3, e.g. 'ocs_daemonon=', normally this is for 'locales=' or 'keyboard-layouts='
        sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*\\\$linux_cmd[[:space:]]*.*)[[:space:]]+$opt_name=[[:space:]]+(.*$)|\$1 $opt_name=${prot_dq}${opt_content}${prot_dq} \$2|i}"
      fi
    fi
    LC_ALL=C perl -pi -e "$sub_menu_entry_cmd" $GRUB_CONF
  fi
  # Restore the status
  hide_reveal_grub_efi_ent "$entry_id" "$status_saved" $GRUB_CONF
} # end of add_opt_in_grub_efi_cfg_block
#
remove_opt_in_grub_efi_cfg_block() {
  local entry_id="$1" # e.g. "clonezilla-se-client"
  local opt_name="$2" # can be ocs_opt (for NFSRoot-based Clonezilla client) or ocs_live_run (for Clonezilla-live-based client)
  local tag_found
  local sub_menu_entry_cmd
  local status_saved
  [ -z "$entry_id" ] && echo "No entry_id in remove_opt_in_grub_efi_cfg_block!" && exit 1
  if [ -n "$GRUB_CONF" -a ! -e "$GRUB_CONF" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "File $GRUB_CONF not found. No support for uEFI network boot."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 2
  fi
  # Before adding option, we have to enable it because with grub there is no
  # way to hide unless with use # to comment the whole menuentry.
  # Save the status first
  status_saved="$(get_status_grub_efi_cfg_block "$entry_id" $GRUB_CONF)"
  hide_reveal_grub_efi_ent "$entry_id" reveal $GRUB_CONF
  # remove something like ocs_opt=... from the append .... like this in pxelinux config:
  # append ... ocs_opt="--language 0  -g auto -p true restoredisk 2disks hda hdb"...
  lines="$(get_grub_efi_image_block "--id $entry_id" $GRUB_CONF)"
  begin_line="$(echo $lines | awk -F" " '{print $1}')"
  end_line="$(echo $lines | awk -F" " '{print $2}')"
  if [ -z "$begin_line" -o -z "$end_line" ]; then
    echo "No \"$entry_id\" found in $GRUB_CONF, skip removing that."
    return 1
  fi
  # 2 types of boot parameters, 1st one is with "=" (e.g. ocs_opt=...), the 2nd one is without "=" (e.g. quiet). Here first we test if the one with "=" is found or not.
  tag_found="$(LC_ALL=C head -n $end_line $GRUB_CONF | tail -n $(($end_line-$begin_line)) | grep -Eiw "^[[:space:]]*$linux_cmd[[:space:]]*.*[[:space:]]+$opt_name=.*([[:space:]]+|$)")"
  if [ -n "$tag_found" ]; then
    # 1st type, i.e. with "=". 2 types of them. 
    # (1) with ", e.g. ocs_live_run="ocs-live-general"
    # (2) without ", e.g. ocs_live_run=ocs-live-general
    # (3) without " and nothing after '=', e.g. 'ocs_live_run='

    # (1) with ", e.g. ocs_live_run="ocs-live-general"
    sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*\\\$linux_cmd[[:space:]]+.*)[[:space:]]+$opt_name=\\\\\"[^\"]*\\\\\"([[:space:]]+.*)|\$1\$2|i}"
    LC_ALL=C perl -pi -e "$sub_menu_entry_cmd" $GRUB_CONF
    # (2) without ", e.g. ocs_live_run=ocs-live-general
    sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*\\\$linux_cmd[[:space:]]+.*)[[:space:]]+$opt_name=[^[:space:]]+([[:space:]]+.*)|\$1\$2|i}"
    LC_ALL=C perl -pi -e "$sub_menu_entry_cmd" $GRUB_CONF
    # (3) without " and nothing after '=', e.g. 'ocs_live_run='
    sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*\\\$linux_cmd[[:space:]]+.*)[[:space:]]+$opt_name=[[:space:]]+(.*)|\$1 \$2|i}"
    LC_ALL=C perl -pi -e "$sub_menu_entry_cmd" $GRUB_CONF
  else
    # 2nd type, i.e. without "=", or nothing. Even if nothing, perl won't fail. Therefore just run it.
    sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*\\\$linux_cmd[[:space:]]+.*)[[:space:]]+$opt_name([[:space:]]+.*)|\$1\$2|i}"
    LC_ALL=C perl -pi -e "$sub_menu_entry_cmd" $GRUB_CONF
  fi
  # Restore the status
  hide_reveal_grub_efi_ent "$entry_id" "$status_saved" $GRUB_CONF
} # end of remove_opt_in_grub_efi_cfg_block
#
override_opt_in_grub_efi_cfg_block() {
  # Function to override all the boot parameters. A grub config block is like:
  # menuentry "Debian Testing-Unstable Linux (DRBL mode, mostly local resources)" --id drbl-client {
  # echo "Enter DRBL..."
  # echo "Loading Linux vmlinuz-pxe..."
  # linux vmlinuz-pxe boot=live union=overlay config components nomodeset quiet net.ifnames=0  nosplash username=drbl keyboard-layouts=us locales=en_US.UTF-8 drbl_live_noconfx ocs_daemonon="ssh" noeject netboot=nfs nfsroot=192.168.7.254:/tftpboot/node_root/clonezilla-live/ dcs_put_dticons="no"
  # echo "Loading initial ramdisk initrd-pxe.img..."
  # initrd initrd-pxe.img
  # }
  local update_mode kernel_f
  local sub_menu_entry_cmd
  local status_saved
  update_mode="linux"  # By default this function is used to update the line begin with "linux"
  while [ $# -gt 0 ]; do
    case "$1" in
      -i|--initrd) shift; update_mode="initrd" ;;
      -*)     echo "${0}: ${1}: invalid option in function override_opt_in_grub_efi_cfg_block"
              echo "$msg_program_stop"
              [ "$save_restore_error_log" = "yes" ] && copy_error_log
              exit 2 ;;
      *)      break ;;
    esac
  done
  local entry_id="$1" # e.g. "clonezilla-se-client"
  local all_opts="$2" # all the boot parameters
  [ -z "$entry_id" ] && echo "No entry_id in override_opt_in_grub_efi_cfg_block!" && exit 1
  if [ -n "$GRUB_CONF" -a ! -e "$GRUB_CONF" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "File $GRUB_CONF not found. No support for uEFI network boot."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 2
  fi
  # Before adding option, we have to enable it because with grub there is no
  # way to hide unless with use # to comment the whole menuentry.
  # Save the status first
  status_saved="$(get_status_grub_efi_cfg_block "$entry_id" $GRUB_CONF)"
  hide_reveal_grub_efi_ent "$entry_id" reveal $GRUB_CONF
  lines="$(get_grub_efi_image_block "--id $entry_id" $GRUB_CONF)"
  begin_line="$(echo $lines | awk -F" " '{print $1}')"
  end_line="$(echo $lines | awk -F" " '{print $2}')"
  if [ -z "$begin_line" -o -z "$end_line" ]; then
    echo "No \"$entry_id\" found in $GRUB_CONF, skip removing that."
    return 1
  fi
  sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*${update_mode}[[:space:]]+).*$|\$1$all_opts|i}"
  LC_ALL=C perl -pi -e "$sub_menu_entry_cmd" $GRUB_CONF
  # Update the echo command for kernel and initrd, too
  case "$update_mode" in
   linux)
     # When in this mode, the 1st parameter in linux "line" is kernel, e.g.
     # linux vmlinuz-pxe root=... ro quiet...
     kernel_f="$(echo $all_opts | awk -F" " '{print $1}')"
     sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*)echo \"Loading Linux kernel.*\"$|\$1echo \"Loading Linux kernel $kernel_f\"|i}"
     LC_ALL=C perl -pi -e "$sub_menu_entry_cmd" $GRUB_CONF
     ;;
   initrd)
     sub_menu_entry_cmd="if ($begin_line..$end_line) {s|(^[[:space:]]*)echo \"Loading initial ramdisk.*\"$|\$1echo \"Loading initial ramdisk $all_opts\"|i}"
     LC_ALL=C perl -pi -e "$sub_menu_entry_cmd" $GRUB_CONF
     ;;
  esac
  # Restore the status
  hide_reveal_grub_efi_ent "$entry_id" "$status_saved" $GRUB_CONF
} # end of override_opt_in_grub_efi_cfg_block
#
confirm_continue_or_not_default_quit() {
  local ans_continue
  local job_before_quit job_des
  while [ $# -gt 0 ]; do
    case "$1" in
      -d|--description)
         shift
         if [ -z "$(echo $1 |grep ^-.)" ]; then
           # skip the -xx option, in case 
           job_des="$1"
           shift
         fi
         if [ -z "$job_des" ]; then
           echo "-d is used, but no job_des assigned."
           echo "$msg_program_stop"
           [ "$save_restore_error_log" = "yes" ] && copy_error_log
           exit 1
         fi
         ;;
      -*)     echo "${0}: ${1}: invalid option"
              echo "$msg_program_stop"
              [ "$save_restore_error_log" = "yes" ] && copy_error_log
              exit 2 ;;
      *)      break ;;
    esac
  done
  job_before_quit="$1"
  if [ -n "$job_des" ]; then
    echo "$job_des"
  fi
  echo "$msg_are_u_sure_u_want_to_continue"
  echo -n "[y/N] "
  read ans_continue
  case "$ans_continue" in
       y|Y|[yY][eE][sS])
          echo "$msg_ok_let_do_it!"
          ;;
       *)
          echo "$msg_program_stop!"
          [ -n "$job_before_quit" ] && $job_before_quit
	  my_ocs_exit 1
          ;;
  esac
} # end of confirm_continue_or_not_default_quit
#
confirm_continue_or_not_default_continue() {
  local ans_continue
  local job_before_quit job_des
  while [ $# -gt 0 ]; do
    case "$1" in
      -d|--description)
         shift
         if [ -z "$(echo $1 |grep ^-.)" ]; then
           # skip the -xx option, in case 
           job_des="$1"
           shift
         fi
         if [ -z "$job_des" ]; then
           echo "-d is used, but no job_des assigned."
           echo "$msg_program_stop"
           [ "$save_restore_error_log" = "yes" ] && copy_error_log
           exit 1
         fi
         ;;
      -*)     echo "${0}: ${1}: invalid option"
              echo "$msg_program_stop"
              [ "$save_restore_error_log" = "yes" ] && copy_error_log
              exit 2 ;;
      *)      break ;;
    esac
  done
  job_before_quit="$1"
  if [ -n "$job_des" ]; then
    echo "$job_des"
  fi
  echo "$msg_are_u_sure_u_want_to_continue"
  echo -n "[Y/n] "
  read ans_continue
  case "$ans_continue" in
       n|N|[nN][oO])
          echo "$msg_program_stop!"
          [ -n "$job_before_quit" ] && $job_before_quit
	  my_ocs_exit 1
          ;;
       *)
          echo "$msg_ok_let_do_it!"
	  ;;
  esac
} # end of confirm_continue_or_not_default_continue
#
confirm_continue_no_default_answer() {
  local ans_ ans_continue continue_choice
  local job_before_quit job_des
  continue_choice=""
  while [ $# -gt 0 ]; do
    case "$1" in
      -d|--description)
         shift
         if [ -z "$(echo $1 |grep ^-.)" ]; then
           # skip the -xx option, in case 
           job_des="$1"
           shift
         fi
         if [ -z "$job_des" ]; then
           echo "-d is used, but no job_des assigned."
           echo "$msg_program_stop"
           [ "$save_restore_error_log" = "yes" ] && copy_error_log
           exit 1
         fi
         ;;
      -*)     echo "${0}: ${1}: invalid option"
              echo "$msg_program_stop"
              [ "$save_restore_error_log" = "yes" ] && copy_error_log
              exit 2 ;;
      *)      break ;;
    esac
  done
  job_before_quit="$1"
  while [ -z "$continue_choice" ]; do
   if [ "$ocs_prompt_mode" = "tui" ]; then
     # Because dialog/whiptail "--yesno" must have a yes or no, we choose no here.
     $DIA --backtitle "$msg_nchc_free_software_labs" --title "$msg_nchc_clonezilla" \
     --defaultno --yesno "${job_des}${msg_are_u_sure_u_want_to_continue}" 0 0 
     ans_="$?"
     # Convert ans_ to ans_continue
     case "$ans_" in
       0) # yes is chosen
          ans_continue="yes";;
       1) # no is chosen
          ans_continue="no";;
     esac
   else
     if [ -n "$job_des" ]; then
       echo "$job_des"
     fi
     echo -n "$msg_are_u_sure_u_want_to_continue (y/n) "
     read ans_continue
   fi
   case "$ans_continue" in
        y|Y|[yY][eE][sS])
           continue_choice="yes"
           echo "$msg_ok_let_do_it!"
           ;;
        n|N|[nN][oO])
           continue_choice="no"
           echo "$msg_program_stop!"
           [ -n "$job_before_quit" ] && $job_before_quit
	   my_ocs_exit 1
           ;;
        *)
           [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
           echo "$msg_you_have_to_enter_yes_or_no!"
           [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
           echo $msg_delimiter_star_line
           ;;
   esac
  done
} # end of confirm_continue_no_default_answer
#
filter_cl_gp_boot_param(){
  # Function to filter the boot parameters which should not be used in PXE RAM based drbl/clonezilla/gparted client.
  # Used for programs drbl-sl and drbl-live
  # (1) For /proc/cmdline, it's like (customized by user):
  # BOOT_IMAGE=/live/vmlinuz initrd=/live/initrd.img boot=live union=overlay username=user config components nomodeset quiet vga=785 ip= net.ifnames=0  nosplash i915.blacklist=yes radeonhd.blacklist=yes nouveau.blacklist=yes vmwgfx.enable_fbdev=1 keyboard-layouts=NONE locales=en_US.UTF-8 drbl_live_noconfx ocs_daemonon="ssh" ocs_prerun1="ifconfig eth0 192.168.120.3; route add default gw 192.168.120.254 eth0; ifconfig eth1 192.168.7.254 netmask 255.255.255.0; echo nameserver 8.8.8.8 > /etc/resolv.conf" ocs_prerun2="mount -t nfs 192.168.120.254:/home/partimag /home/partimag" ocs_prerun3="drbl-live --batch --skip-pause-in-the-end --no-prompt-drbl-live start" ocs_prerun5="perl -pi -e 's/timeout 70/timeout 10/' /tftpboot/nbi_img/pxelinux.cfg/default"
  # (2) For isolinux.cfg or syslinux.cfg, it's like (customized by user):
  # append initrd=/live/initrd.img boot=live union=overlay username=user config components nomodeset quiet vga=785 ip= net.ifnames=0  nosplash i915.blacklist=yes radeonhd.blacklist=yes nouveau.blacklist=yes vmwgfx.enable_fbdev=1 keyboard-layouts=NONE locales=en_US.UTF-8 drbl_live_noconfx ocs_daemonon="ssh" ocs_prerun1="ifconfig eth0 192.168.120.3; route add default gw 192.168.120.254 eth0; ifconfig eth1 192.168.7.254 netmask 255.255.255.0; echo nameserver 8.8.8.8 > /etc/resolv.conf" ocs_prerun2="mount -t nfs 192.168.120.254:/home/partimag /home/partimag" ocs_prerun3="drbl-live --batch --skip-pause-in-the-end --no-prompt-drbl-live start" ocs_prerun5="perl -pi -e 's/timeout 70/timeout 10/' /tftpboot/nbi_img/pxelinux.cfg/default" 
  # (3) For grub.cfg, it's like:
  # $linux_cmd /live/vmlinuz boot=live union=overlay username=user config components quiet noswap edd=on nomodeset enforcing=0 locales= keyboard-layouts= ocs_live_run="ocs-live-general" ocs_live_extra_param="" ocs_live_batch="no" vga=788 ip= net.ifnames=0  splash i915.blacklist=yes radeonhd.blacklist=yes nouveau.blacklist=yes vmwgfx.enable_fbdev=1
  # So the 1st two items should be removed
  awk -F" " '{for (i=3; i<=NF; ++i) print $i}' | xargs echo |\
  sed -r -e "s|append||g" |\
  sed -r -e "s|BOOT_IMAGE=[^[:space:]]+[[:space:]]?||g" | \
  sed -r -e "s|initrd=[^[:space:]]+[[:space:]]?||g" | \
  sed -r -e "s|vga=[^[:space:]]+[[:space:]]?||g" | \
  sed -r -e "s|ip=[^[:space:]]*[[:space:]]?||g" | \
  sed -r -e "s|keyboard-layouts=[^[:space:]]+[[:space:]]?||g" | \
  sed -r -e "s|locales=[^[:space:]]+[[:space:]]?||g" | \
  sed -r -e "s|[^[:space:]]+.blacklist=[^[:space:]]+[[:space:]]?||g" | \
  sed -r -e "s|vmwgfx.enable_fbdev=[^[:space:]]+[[:space:]]?||g" | \
  sed -r -e "s|ocs_prerun[[:digit:]]*=\".*\"||g" | \
  sed -r -e "s|ocs_daemon.*=\".*\"||g" | \
  sed -r -e "s|drbl_live_noconfx||g" | \
  sed -r -e "s|toram=?[^[:space:]]*[[:space:]]?||g" | \
  sed -r -e "s|^[[:space:]]*||g" | \
  sed -r -e "s|[[:space:]]+$||g"
} # end of filter_cl_gp_boot_param
#
is_valid_IPv4_add() {
  local input_ip="$1"
  local rc=1
  if [ -n "$(echo $input_ip | grep -Eo "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$")" ]; then
    rc=0
  else
    rc=1
  fi
  return $rc
} # end of is_valid_IPv4_add
#
deploy_pxecfg_grubefi_files(){
  # This function will set the specific config or just keep the "default"
  if [ "$LIST_HOST" = "on" ]; then
    # specify the nodes if assigned by user
    echo "Create specific config for PXE and GRUB EFI NB client."
    set_specific_host_pxe_conf `cat $HOSTS_TMP`
    set_specific_host_grub_efi_conf `cat $HOSTS_TMP`
  else
    # for all clients, so we just keep the file pxelinux.cfg/default, no others.
    echo "This is for all clients, so we remove other host-based PXE config files in $PXELINUX_DIR/ and keep $PXE_CONF."
    clean_stale_node_pxe_cfg
    clean_stale_node_grub_efi_cfg
  fi
} # end of deploy_pxecfg_grubefi_files
#
gen_dnsmasq_cfg() {
  local srv_cfg="$1"
  local gen_mode="proxy"  # default mode is proxy
  local dnsmasq_v pxelinux_fn
  local allow_1_nic="no" # By default should be in DRBL mode, i.e., 2 or more NICs.
  if [ -z "$srv_cfg" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "No config file assigned in function gen_dnsmasq_cfg!"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "$msg_program_stop"
    exit 1
  fi
  while [ $# -gt 0 ]; do
    case "$1" in
      -a|--allow-1-nic) allow_1_nic="yes"; shift;;
      -r|--range)
          shift; gen_mode="range"
          if [ -z "$(echo $1 |grep ^-.)" ]; then
            # skip the -xx option, in case 
            dhcp_range="$1"
            shift
          fi
          [ -z "$dhcp_range" ] && echo "-m is used, but no dhcp_range was assigned." && exit 1
          shift
          ;;
      -*) echo "${0}: ${1}: invalid option in gen_dnsmasq_cfg." | tee -a ${OCS_LOGFILE} >&2
          echo "$msg_program_stop" | tee -a ${OCS_LOGFILE}
          [ "$save_restore_error_log" = "yes" ] && copy_error_log
          exit 2 ;;
      *)  break ;;
    esac
  done
  # Generate dnsmasq.conf
  cat <<-DNSMQSQ_END > $dnsmasq_cfg
# Configured by DRBL/Clonezilla
bind-interfaces
log-dhcp
dhcp-no-override
enable-tftp
tftp-root=$pxecfg_pd
DNSMQSQ_END

  case "$gen_mode" in
    proxy) all_eth_dev="$(LC_ALL=C get-all-nic-ip -d)"
           uplink_eth="$(LC_ALL=C get-all-nic-ip -u)"
           for inet in $all_eth_dev; do
             if [ "$allow_1_nic" = "no" ]; then
               # Do not allow 1 NIC, so skip if uplink is the same with all NIC.
               [ "$inet" = "$uplink_eth" ] && continue
             fi
             ip="$(LC_ALL=C drbl-get-ipadd $inet)"
             echo "dhcp-range=$ip,proxy" >> $dnsmasq_cfg
           done
           ;;
    range) echo "dhcp-range=$dhcp_range" >> $dnsmasq_cfg;;
        *) echo "${0}: ${1}: Unknown gen_mode in gen_dnsmasq_cfg." | tee -a ${OCS_LOGFILE} >&2
           echo "$msg_program_stop" | tee -a ${OCS_LOGFILE}
           [ "$save_restore_error_log" = "yes" ] && copy_error_log
           exit 2 ;;
  esac

  # Older dnsmasq (<2.75) will automatically append ".0" to pxelinux
  dnsmasq_v="$(query_pkg_ver dnsmasq)"
  if [ -z "$dnsmasq_v" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "Package dnsmasq is not installed. Skip generating dnsmasq.conf."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    return 1
  fi
  # dnsmasq version >= 2.76 will not append ".0" to basename.
  # Ref: http://www.thekelleys.org.uk/dnsmasq/CHANGELOG (search basename)
  if [ "$dnsmasq_v" \> "2.75" -o "$dnsmasq_v" = "2.76" ]; then
    pxelinux_fn="pxelinux.0"
  else
    pxelinux_fn="pxelinux"
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "Warning!"
    echo "Package dnsmasq is too old. It's recommended to use version >= 2.75."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  fi
  
  # pxe-service mode does not work for non-proxy mode. It fails for supporting uEFI secure netboot
  # Hence we use dhcp-boot for non-proxy mode. This is a workaround to support uEFI secure netboot.
  # Ref: http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2018q3/012476.html
  case "$gen_mode" in
    proxy) 
     cat <<-DNSMQSQ_END >> $dnsmasq_cfg 

## PXEClient:Arch:00000
pxe-service=X86PC, "Boot BIOS PXE", $pxelinux_fn

## PXEClient:Arch:00007
pxe-service=BC_EFI, "Boot UEFI BC", bootx64.efi

## PXEClient:Arch:00009
pxe-service=X86-64_EFI, "Boot UEFI X86-64", bootx64.efi

pxe-prompt="Booting DRBL/Clonezilla Client", 1
DNSMQSQ_END
     ;;
    range) 
     cat <<-DNSMQSQ_END >> $dnsmasq_cfg 

dhcp-boot=$pxelinux_fn
dhcp-match=set:efi-x86_64,option:client-arch,7
dhcp-boot=tag:efi-x86_64,bootx64.efi
DNSMQSQ_END
     ;;
   esac
} # end of gen_dnsmasq_cfg
#
query_pkg_ver() {
  local pkg_ rc
  pkg_="$1"
  if [ -z $"pkg_" ]; then
    return 1
  fi
  if [ -e /etc/debian_version ]; then
    # Debian, Ubuntu
    ver_="$(LC_ALL=C dpkg-query -W -f='${Version}\n' ${pkg_} 2>/dev/null)"
    rc=$?
  else
    # Fedora, CentOS, RHEL, SuSE...
    ver_="$(LC_ALL=C rpm -q --qf "%{VERSION}\n" ${pkg_} 2>/dev/null)"
    rc=$?
  fi
  if [ "$rc" -eq 0 ]; then
    echo "$ver_"
  fi
  return $rc
} # end of query_pkg_ver
#
function check_url(){
  # Function to check if URL exists or not.
  # Ref: https://gist.github.com/hrwgc/7455343
  local url_t="$1"
  local rc
  if [ -n "$(LC_ALL=C wget --spider -S $url_t 2>&1 | grep -E 'HTTP/1.1 200 OK')" ]; then
    rc=0
  else
    rc=1
  fi
  return $rc
} # end of check_url
#
get_smtd_smmcb_switch() {
  # Function to assign the on/off switch for -smtd/-smmcb
  # For x86-64: off, others: on
  local running_cpu
  # smtd_smmcb_switch is a global variable
  running_cpu="$(uname -m)"
  case "$running_cpu" in
    x86_64) smtd_smmcb_switch="off";;
         *) smtd_smmcb_switch="on";;
  esac
} # end of get_smtd_smmcb_switch