drbl 2.11.15-1 / usr / share / drbl / sbin / drbl-functions

#!/bin/bash
# -*-Shell-script-*-
# Steven Shiau <steven _at_ nchc org tw>
# 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 

[ -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"

# 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* $newroot
  if ldd /sbin/depmod &>/dev/null; then
    depmod_lib_need=$(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 $imod $newroot
    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 $newroot
  if ldd /sbin/chkconfig &>/dev/null; then
    chkconfig_lib_need=$(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 $imod $newroot
    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 /sbin/insserv $newroot
  if ldd /sbin/insserv &>/dev/null; then
    insserv_lib_need=$(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 $imod $newroot
    done
  fi
}
# Check if root or not
check_if_root() {
   if [ ! "$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
}
# 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 $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 $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 $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}')"
  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 $imod $newroot
  done
  # /bin/echo is necessary for chpasswd
  cp --parents /bin/echo $newroot
  cp --parents /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
}

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
}

# 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
}

conv_devfspart_to_tradpart() {
   # function to convert devfs partitions to traditional partitions
   # fix the disk/partition, we do not want the devfs style for clonezilla
   TARGET_FILE="$1"
   [ -z "$TARGET_FILE" ] && echo "No output filename! Program stop!!!" && return 1
   [ -f "$TARGET_FILE" ] && rm -f $TARGET_FILE
   while read major minor block p x; do
     p="$(fixdevfs "/dev/$p")"
     echo "$major $minor $block $p" >> $TARGET_FILE
   done < /proc/partitions
}

# get dhcpd interface
get_dhcpd_interface() {
  local INTERFACES= 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
  echo $INTERFACES
} # 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() {
    setterm -blank 0
}

# 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
      "1")
           language="zh_TW.BIG5"
           ;;
      "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="$2"
     [ -z "$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
     return 0
}

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 "$language_opt" = "a" ]; then
    # Language
    echo "Language?".
    echo "[0]: English"
    echo "[1]: Traditional Chinese (Big5) - Taiwan".
    echo "[2]: Traditional Chinese (UTF-8, Unicode) - Taiwan"
    echo -n "[0] "
    read lang_answer
    [ -z "$lang_answer" ] && lang_answer="en_US.UTF-8"
  else
    lang_answer="$language_opt"
  fi
} # end of ask_lang_set

load_lang_set() {
  lang_answer=$1
  # The language files are en, tw.BIG5 and tw.UTF-8, we have to format the input parameter.
  case "$lang_answer" in
     1|zh_TW.BIG5|zh_TW.big5|tw.BIG5)
        lang="zh_TW.BIG5"
        ;;
     2|zh_TW.UTF-8|zh_TW.utf8|tw.UTF-8|tw.utf8)
        lang="zh_TW.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
  else
    echo "Not such language option!!!"
    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 "       [1|zh_TW.BIG5]: Traditional Chinese (Big5) - Taiwan,"
  echo "       [2|zh_TW.UTF-8]: Traditional Chinese (UTF-8, Unicode) - Taiwan"
  echo "       [a|ask]: Prompt to ask the language index"
}
#
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.BIG5, 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}')"
  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 $imod $newroot
  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 [ -d "/usr/lib/perl" ]; 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 $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 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"
  # 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
} # 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 $2}')"
  # if end_line is nothing, it must be the last block, i.e. we can not find the next [.*]
  if [ -z "$end_line" ]; then
    end_line="$(LC_ALL=C wc -l $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="$1" # The file to output the result //NOTE// This is to be append, not overwritten.
  # For Clonezilla SE mode, we always ask this (reboot, poweroff...) no matter it's advanced or beginner mode.
  if [ -z "$ocs_postmode" ]; then
    $DIA --backtitle "$msg_nchc_free_software_labs" --title  \
    "$msg_clonezilla_advanced_extra_param | $msg_mode: $ocs_mode_prompt" --menu "$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_advanced_param_post_mode_after_clone() {
  local ocs_parm="$1" # The file to output the result //NOTE// This is to be append, not overwritten.
  if [ "$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_post_mode_after_clone:" \
    0 0 0 $DIA_ESC \
    "-p true "      "$msg_ocs_param_p_true" \
    "-p reboot "    "$msg_ocs_param_p_reboot" \
    "-p poweroff "  "$msg_ocs_param_p_poweroff" \
    2>> $ocs_parm
  else
    echo "-p true " >> $ocs_parm
  fi
} # end of ocs_sr_advanced_param_post_mode_after_clone
#
show_z4_or_above_menu_or_not() {
  # function to show -z4, -z5/z5p, -z6/z6p options
  if type lzma &>/dev/null; then
    # "-z4"      "$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 "$msg_ocs_param_z5")"
  fi
  if type pxz &>/dev/null; then
    # "-z5p"      "$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
} # end show_z4_or_above_menu_or_not
#
set_drbl_ocs_extra_param() {
local mode="$1"
OCS_PARAM_TMP="$2"
local dev_="$3"
local vol_size_tmp
local ASK_VOL_SIZE=1
local inst_grub_opt
vol_size_tmp="$(mktemp /tmp/vol_size_tmp.XXXXXX)"

# 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
    $DIA --separate-output --backtitle "$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 \
    "-r"       "$msg_ocs_param_r" on \
    "-ns"      "$msg_ocs_param_ns" off \
    "-e"       "$msg_ocs_param_e" off \
    "-icrc"    "$msg_ocs_param_icrc" off \
    "-irhr"    "$msg_ocs_param_irhr" off \
    "-ius"     "$msg_ocs_param_ius" off \
    "-icds"    "$msg_ocs_param_icds" off \
    "-iefi"    "$msg_ocs_param_iefi" off \
    "-j1"      "$msg_ocs_param_j1" off \
    "-j2"      "$msg_ocs_param_j2" on \
    "-cm"      "$msg_ocs_param_cm" off \
    "-cs"      "$msg_ocs_param_cs" off \
    "-f"       "$msg_ocs_param_f" off \
    "-s"       "$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 \
  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" > $OCS_PARAM_TMP
    else
      # restoreparts mode.
      # "$inst_grub_opt" = "off" (no "-g auto") means skip_clean_mbr_opt="on" (-t)
      echo "-e1 auto" "-e2" "-t" "-r" "-x" "-j2" > $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_choose_param_to_set_single_choice $msg_hint_for_fdisk:" \
      0 0 0 $DIA_ESC \
      "-k "      "$msg_ocs_param_k"  \
      "-k1 "     "$msg_ocs_param_k1"  \
      "-k2 "     "$msg_ocs_param_k2"  \
      "-j0 "     "$msg_ocs_param_j0" \
      " "        "$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_choose_param_to_set_single_choice $msg_hint_for_fdisk:" \
      0 0 0 $DIA_ESC \
      " "        "$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
      echo " " >> $OCS_PARAM_TMP
    fi
    ;;
  esac
  if grep -Ew "exit" $OCS_PARAM_TMP &>/dev/null; then
    echo "$msg_program_stop"
    exit 1
  fi
  if LC_ALL=C grep -Ew -- "(-k1|-k2)" $OCS_PARAM_TMP &>/dev/null; then
    # Option -k1 or -k2 is for different partition size, turn on -r by default
    if [ -z "$(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
  fi

  # about y[0-2]
  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 "" >> $OCS_PARAM_TMP
  fi
else
  # save
  # about -q, -q1, -q2
  if [ "$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

  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 "        "$msg_ocs_param_a" off \
    "-f "        "$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 \
    "-o0 "       "$msg_ocs_param_o0" off \
    "-o1 "       "$msg_ocs_param_o1" off \
    2>> $OCS_PARAM_TMP
  else
    echo "-j2 " >> $OCS_PARAM_TMP
  fi
  # Question about fsck the source partition. By default, no matter it's beginner or advanced mode, we will ask.
  # However, for some customized case, it it could be set via parameter ocs_fsck_src_part.
  if [ -z "$ocs_fsck_src_part" ]; 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-src-part "   "$msg_ocs_param_fsck_src_part" \
    "-fsck-src-part-y " "$msg_ocs_param_fsck_src_part_yes" \
    2>> $OCS_PARAM_TMP
  else
    # Convert none to "", as we can not set ocs_fsck_src_part as "" otherwise it will be asked in the previous if block.
    ocs_fsck_src_part="$(echo $ocs_fsck_src_part | sed -r -e "s/none//g")"
    echo "$ocs_fsck_src_part " >> $OCS_PARAM_TMP
  fi

  # Question about checking the image is restorable or not. 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 ocs_chk_img.
  # ocs_chk_img is from /etc/ocs/ocs-live.conf
  if [ -z "$ocs_chk_img" ]; 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" \
    "-sc "  "$msg_ocs_param_skip_checking_img_restorable" \
    2>> $OCS_PARAM_TMP
  else
    # Convert none to "", as we can not set ocs_chk_img as "" otherwise it will be asked in the previous if block.
    ocs_chk_img="$(echo $ocs_chk_img | sed -r -e "s/none//g")"
    echo "$ocs_chk_img " >> $OCS_PARAM_TMP
  fi
fi

ocs_advanced_param_post_mode_after_clone $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 M$ 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 [ "$mode" = "save" ]; then
  # save
  show_z4_or_above_menu_or_not
  if [ "$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 $DIA_ESC \
    "-z1p"     "$msg_ocs_param_z1p" \
    "-z1"      "$msg_ocs_param_z1" \
    "-z2p"     "$msg_ocs_param_z2p" \
    "-z2"      "$msg_ocs_param_z2" \
    "-z3"      "$msg_ocs_param_z3($msg_note!!)" \
    $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      $ocs_z7_option_2 \
    "-z0"      "$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
    echo "-z1p " >> $OCS_PARAM_TMP
  fi
  # About image volume size
  if [ -z "$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_clonezilla_advanced_extra_param | $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)" >> $OCS_PARAM_TMP
    [ -f "$vol_size_tmp" ] && rm -f $vol_size_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

} # 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="$2"
local mode2_="$3"
local cpu_no
local vol_size_tmp
local ASK_VOL_SIZE=1
local inst_grub_opt
vol_size_tmp="$(mktemp /tmp/vol_size_tmp.XXXXXX)"

# 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
    $DIA --separate-output --backtitle "$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 \
    "-r"       "$msg_ocs_param_r" on \
    "-e"       "$msg_ocs_param_e" off \
    "-icrc"    "$msg_ocs_param_icrc" off \
    "-irhr"    "$msg_ocs_param_irhr" off \
    "-ius"     "$msg_ocs_param_ius" off \
    "-icds"    "$msg_ocs_param_icds" off \
    "-iefi"    "$msg_ocs_param_iefi" off \
    "-j1"      "$msg_ocs_param_j1" off \
    "-j2"      "$msg_ocs_param_j2" on \
    "-cm"      "$msg_ocs_param_cm" off \
    "-cs"      "$msg_ocs_param_cs" off \
    "-a"       "$msg_ocs_param_a" off \
    "-o0"      "$msg_ocs_param_o0" off \
    "-o1"      "$msg_ocs_param_o1" off \
    "-srel"    "$msg_ocs_param_srel" off \
    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" "-c" "-r" "-j2" > $OCS_PARAM_TMP
    else
      # restoreparts mode.
      # "$inst_grub_opt" = "off" (no "-g auto") means skip_clean_mbr_opt="on" (-t)
      echo "-e1 auto" "-e2" "-c" "-t" "-r" "-j2" > $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_choose_param_to_set_single_choice $msg_hint_for_fdisk:" \
        0 0 0 $DIA_ESC \
        "-k "      "$msg_ocs_param_k"  \
        "-k1 "     "$msg_ocs_param_k1"  \
        "-k2 "     "$msg_ocs_param_k2"  \
        "-j0 "     "$msg_ocs_param_j0" \
        " "        "$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_choose_param_to_set_single_choice $msg_hint_for_fdisk:" \
        0 0 0 $DIA_ESC \
        " "        "$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
        echo " " >> $OCS_PARAM_TMP
      fi
      ;;
  esac
  if grep -Ew "exit" $OCS_PARAM_TMP &>/dev/null; then
    echo "$msg_program_stop"
    exit 1
  fi
  if LC_ALL=C grep -Ew -- "(-k1|-k2)" $OCS_PARAM_TMP &>/dev/null; then
    # Option -k1 or -k2 is for different partition size, turn on -r by default
    if [ -z "$(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 " >> $OCS_PARAM_TMP
    fi
  fi
else
  # save
  # about -q, -q1, -q2
  if [ "$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

  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 "       "$msg_ocs_param_a" off \
    "-rm-win-swap-hib " "$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 \
    2>> $OCS_PARAM_TMP
  else
    echo "-c " "-j2 " >> $OCS_PARAM_TMP
  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 M$ 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" \
      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($msg_note!!)" \
      $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      $ocs_z7_option_2 \
      "-z0"            "$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
      echo "-z1p " >> $OCS_PARAM_TMP
    fi
  else
    # Hide -z1p, z2p...
    if [ "$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($msg_note!!)" \
      $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      $ocs_z7_option_2 \
      "-z0"            "$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
      echo "-z1 " >> $OCS_PARAM_TMP
    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)" >> $OCS_PARAM_TMP
    [ -f "$vol_size_tmp" ] && rm -f $vol_size_tmp
  else
    echo "-i $VOL_LIMIT_IN_INTERACTIVE" >> $OCS_PARAM_TMP
  fi
  # Question about fsck the source partition. By default, no matter it's beginner or advanced mode, we will ask.
  # However, for some customized case, it it could be set via parameter ocs_fsck_src_part.
  if [ -z "$ocs_fsck_src_part" ]; 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-src-part "   "$msg_ocs_param_fsck_src_part" \
    "-fsck-src-part-y " "$msg_ocs_param_fsck_src_part_yes" \
    2>> $OCS_PARAM_TMP
  else
    # Convert none to "", as we can not set ocs_fsck_src_part as "" otherwise it will be asked in the previous if block.
    ocs_fsck_src_part="$(echo $ocs_fsck_src_part | sed -r -e "s/none//g")"
    echo "$ocs_fsck_src_part " >> $OCS_PARAM_TMP
  fi
  
  # Question about checking the image is restorable or not. 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 ocs_chk_img.
  # ocs_chk_img is from /etc/ocs/ocs-live.conf
  if [ -z "$ocs_chk_img" ]; 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" \
    "-sc "  "$msg_ocs_param_skip_checking_img_restorable" \
    2>> $OCS_PARAM_TMP
  else
    # Convert none to "", as we can not set ocs_chk_img as "" otherwise it will be asked in the previous if block.
    ocs_chk_img="$(echo $ocs_chk_img | sed -r -e "s/none//g")"
    echo "$ocs_chk_img " >> $OCS_PARAM_TMP
  fi
fi

# For expert mode, we always ask it.
# For beginner mode, if user has specified postrun, then we do not have to set it. Otherwise, ask it.
if [ "$ocs_user_mode" = "expert" ]; then
  ocs_sr_advanced_param_post_mode_after_clone $OCS_PARAM_TMP
else
  if [ -n "$postrun" ]; then
    echo "-p $postrun " >> $OCS_PARAM_TMP
  else
    ocs_sr_advanced_param_post_mode_after_clone $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

} # 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
}
#
get_dir_filesystem(){
  # function to show the filesystem of input dir
  local target_dir="$1"
  local df_list
  [ -z "$target_dir" ] && return 1
  # merge the  df -T output as one line, otherwise for some version of df with nfs, the results is in 2 lines like:
  # [root@co50102 tmp]# LC_ALL=C df -T /home/partimag/
  #    Filesystem    Type   1K-blocks      Used Available Use% Mounted on
  #    192.168.205.254:/home
  #                   nfs     7395808   3855328   3158752  55% /home
  df_list="$(LC_ALL=C df -T $target_dir | tail -n +2)"
  echo $df_list | awk -F" " '{print $2}'
}

# 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 [ ] ^ ! $ %
make_random_password(){ 
  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
}
#
config_drbl_live_network(){
  # 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_ports="$(LC_ALL=C get-nic-devs)"
    configured_port_list=""
    for i in $eth_ports; do
      if [ -n "$(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
  elif [ "$IP_no" -eq 1 ]; then
    if [ -z "$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 "$msg_only_one_IP_so_create_alias_IP "
    alias_done="no"
    i="$drbl_live_private_IP_alias_eth_def"
    while [ "$alias_done" = "no" ]; do
      if ! ping -c 3 192.168.$i.254 &>/dev/null; then
        ifconfig eth0:1 192.168.$i.254 netmask 255.255.255.0
        alias_done="yes"
      else
        i=$((i+1))
      fi
    done
    if ! egrep -e "^auto[[:space:]]+eth0:1" /etc/network/interfaces; then
      cat <<-NET_END >> /etc/network/interfaces
auto eth0:1
iface eth0:1 inet static
	address 192.168.$i.254
	netmask 255.255.255.0
NET_END
    fi
    echo "$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 $param_; do
    # The parameter maybe like: xxx=xyz, xxx="xyz", xxx="-k -x", or "xxx=-k -x" (see below)
    ###
    # The 1st 3 are cases xxx="-k -x", xxx="xyz" or "xxx=a b c", it allows spaces between " "
    # Possible complicated commands:
    # ocs_prerun="sshfs -o nonempty -p 22 root@myhost.mymachine:/home/partimag/ /home/partimag"
    # ocs_prerun="mount -t cifs -o username=user,password=pass //127.0.0.1/test /home/partimag"
    # ocs_prerun="sudo mount -t cifs -o user=ghost,password=ghost123 //192.168.1.1/tftpboot$/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.
    # 3 cases:
    # Boot parameters           /proc/cmdline
    # ocs_prerun="sleep 5"      "ocs_prerun=sleep 5" (Yes, with " in the beginning and in the end.
    # ocs_prerun='sleep 5'      "ocs_prerun=sleep 5"
    # ocs_prerun=\"sleep 5\"    ocs_prerun=\"sleep 5\"
    # 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]\""
    # =================
    # ///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=" $cmdl_file; then
      # For case like: "ocs_prerun=sleep 5", "ocs_prerun1=mount UUID=XXXYYZZ /mnt"
      # 2012/08/20 Without separating "=", it might fail in this case:
      # "ocs_prerun1=mount UUID=XXXYYZZ /mnt" -> ocs_prerun1=mount UUID="XXXYYZZ /mnt"
      # Therefore we have to use: sed -r -e 's|^\"(.*=)(.*=.*)*|\1\"\2|g'
      # Ref: http://stackoverflow.com/questions/9681393/sed-multiple-patterns-on-the-same-line-how-to-match-parse-first-one
      LC_ALL=C grep -oE -- "\"$ik=[^\"]*\"([[:space:]]|$)+" $cmdl_file | sed -r -e "s|=\\\\\"|=\"|g" -e "s@\\\\\"([[:space:]]|$)+@\"@g" | sed -r -e 's|^\"(.*=)(.*=.*)*|\1\"\2|g' > $parse_tmp
    else
      # This is for case xxx=xyz, no space in its assignment
      LC_ALL=C grep -oE -- "$ik=([[:alnum:]]|_|-|\.|\/|:)*([[: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.XXXXX" 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.XXXXX", 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_syslinux_pxelinux_menu() {
  local TDIR  # Where netinstall kernel/initrd exists (/tftpboot/nbi_img)
  local PXECFG_DIR_FNAME  # Where pxeliux cfg file exists (/tftpboot/nbi_img/pxelinux.cfg/)
  local menu_hint ni_ver ni_arch boot_file_dir
  # 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 "$1" in
     -p|--prefix)
           shift
           if [ -z "$(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
           ;;
     -*)   echo "${0}: ${1}: invalid option" >&2
           exit 2 ;;
     *)    break ;;
   esac
  done

  TDIR="$1" 
  PXECFG_DIR_FNAME="$2"
  
  # 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 $inet | grep -iE "\-fedora-([5-9]|1[1-6])-" 2>/dev/null)" ]; then
        # For Fedora 5 to 16.
        extra_append=""
      else
        # Ref: https://bugzilla.redhat.com/show_bug.cgi?id=810005
        echo "Using Fedora installation repository \"$fedora_url_site\" from drbl.conf"
        extra_append="inst.repo=$fedora_url_site/fedora/linux/releases/$ni_ver/Fedora/$ni_arch/os"
      fi
      # For Fedora, enable reiserfs when installing
      menu_hint=""
   elif [ -n "$(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 $inet | grep -iE "\-centos-[5-6]-" 2>/dev/null)" ]; then
        # For CentOS 5 to 6.
        extra_append=""
      else
        # Ref: https://bugzilla.redhat.com/show_bug.cgi?id=810005
        echo "Using CentOS installation repository \"$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/$ni_arch"
      fi
      # For CentOS, enable reiserfs when installing
      menu_hint=""
   elif [ -n "$(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

   echo "Adding $img_menu menu..."
   [ -n "$verbose" ] && echo "extra option in append: $extra_append"    
   # Generate the description:
   # EX for i: rh-8.0-netinstall
   # create the description for the netinstall image
   des="$(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
   cat <<-PXE_END >> $PXECFG_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
  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..."
   cat <<-PXE_END >> $PXECFG_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
  done
} # end of output_netinstall_syslinux_pxelinux_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="$2"
  local syslinux_tarball syslinux_ver_subdir syslinux_extra_c32 dirprefix syslinux_efi_coms
  [ -z "$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
  echo "Downloading $syslinux_binsrc_url/$syslinux_ver_subdir/$syslinux_tarball..."
  wget $wget_opt -P $sysl_dir $syslinux_binsrc_url/$syslinux_ver_subdir/$syslinux_tarball
  # 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...
  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 $syslinux_extra_c32
   mv -f syslinux-${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}/${dirprefix}extlinux/extlinux .
   if [ -n "$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="$2"  
  local sysl_dir sysl_extra_c32_chklist
  sysl_extra_c32_chklist="ldlinux.c32 libcom32.c32 libutil.c32"
  [ -z "$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}
  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.bat $t_dir/utils/win64/
  sysl_dir="$(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/{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/{syslinux,extlinux} $t_dir/utils/linux/
  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 $t_dir/isolinux/
    fi
  done
  # For EFI machine
  if [ "$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 $2}')"
  if dpkg --compare-versions "$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" "<<" "$debootstrap_ver_required"; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "Required debootstrap version: $debootstrap_ver_required"
    echo "Installed debootstrap version: $debootstrap_ver"
    echo "You have to install debootstrap (version $debootstrap_ver_required or later)."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "Program terminated!"
    exit 1
  fi
  if [ "$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.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" \
  2> $TMP
  mode="$(cat $TMP)"
  [ -f "$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
		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-i386/Packages.gz to finding latest $pkg version..."
    LC_ALL=C wget -q -P $ktmp/ $drbl_mirror_url/dists/drbl/$branch/binary-i386/Packages.gz
    pver="$(zgrep -Ew -A 10 "^Package: $pkg" $ktmp/Packages.gz | grep -E "^Version:" | sed -e "s/^Version: //g" | sort -V -r | uniq | head -n 1)"
    if [ -z "$pver" ]; then
      # Clean Packages.gz to avoid wget using another name like Packages.gz.1 then search the next again
      rm -f $ktmp/Packages.gz
      return 1
    fi
  if [ -n "$pver" ]; then
    release_kernel_ver="$pver"
  else
    [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
    echo "Warning!"
    echo "Unable to find the latest kernel version in $drbl_mirror_url/dists/$i/main/binary-i386/Packages.gz. Use the pre-defined one."
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo -n "$msg_press_enter_to_continue"
    read 
    eval release_kernel_ver="\$${i}_release_kernel_ver_def"
  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.gz"
  echo -n "Creating checksums..."
  rm -f MD5SUMS SHA1SUMS SHA256SUMS
  for i in $filetype; do
    if [ -n "$(ls *.$i 2>/dev/null)" ]; then
      echo -n "."
      LC_ALL=C md5sum *.$i  >> MD5SUMS
      echo -n "."
      LC_ALL=C sha1sum *.$i >> SHA1SUMS 
      echo -n "."
      LC_ALL=C sha256sum *.$i >> SHA256SUMS 
    fi
  done
  echo " Done!"
  
  echo "### MD5SUMS:" > $sum_file
  cat MD5SUMS >> $sum_file

  echo >> $sum_file
  echo "### SHA1SUMS:" >> $sum_file
  cat SHA1SUMS >> $sum_file

  echo >> $sum_file
  echo "### SHA256SUMS:" >> $sum_file
  cat SHA256SUMS >> $sum_file

  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_root" ]; 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