path: root/draft/other-tools/clonezilla/ocs-expand-mbr-pt

#!/bin/bash
# Author: Steven Shiau <steven _at_ nchc org tw>
# License: GPL
# A script to expand the partition table by disk size ratio.
# ///NOTE/// This program only works for MBR partition table, not for GPT.

# Load DRBL setting and functions
DRBL_SCRIPT_PATH="${DRBL_SCRIPT_PATH:-/usr/share/drbl}"

. $DRBL_SCRIPT_PATH/sbin/drbl-conf-functions
. /etc/drbl/drbl-ocs.conf
. $DRBL_SCRIPT_PATH/sbin/ocs-functions

# Settings
# Flag to check target disk size before creating partition table
chk_tgt_disk_size_bf_mk_pt="yes"

#
cmd_name="$(basename $0)"
#
USAGE() {
    echo "$cmd_name: To create a proportional MBR partition table (not GPT) in a disk based on a existing partition table (sfdisk format)"
    echo "Usage:"
    echo "  $cmd_name [OPTION] PARTITION_TABLE_FILE TARGET_DEVICE"
    echo 
    echo "OPTION:"
    echo " -b, --batch     Run $cmd_name in batch mode, i.e. without any prompt or wait to press enter. VERY DANGEROUS!"
    echo "$cmd_name will honor experimental variable EXTRA_SFDISK_OPT and use it as the option for sfdisk."
    echo " -icds, --ignore-chk-dsk-size-pt  Skip checking destination disk size before creating the partition table on it. By default it will be checked and if the size is smaller than the source disk, quit."
    echo "Example:"
    echo "  To create a proportional partition table on disk /dev/sda based on /home/partimag/IMAGE/sda-pt.sf, use:"
    echo "$cmd_name /home/partimag/IMAGE/sda-pt.sf /dev/sda"
}         
          
# Parse command-line options
while [ $# -gt 0 ]; do
  case "$1" in
    -b|--batch)
            batch_mode="yes"
	    shift;;
    -icds|--ignore-chk-dsk-size-pt)
	    chk_tgt_disk_size_bf_mk_pt="no"
	    shift;;
    -*)     echo "${0}: ${1}: invalid option" >&2
            USAGE >& 2
            exit 2 ;;
    *)      break ;;
  esac
done

# Original sfdisk format file
orig_sf=$1   # orig_sf is like: /home/partimag/IMAGE/sda-pt.sf
target_disk=$2  # target_disk is like: /dev/sda

#
ask_and_load_lang_set $specified_lang

#
if [ -z "$orig_sf" ]; then
  [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  echo "No source partition table file was assigned!"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  USAGE
  echo "$msg_program_stop!"
  exit 1
fi
if [ ! -f "$orig_sf" ]; then
  [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  echo "Source partition table file \"$orig_sf\" was _NOT_ found"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo "$msg_program_stop!"
  exit 1
fi

if [ -z "$target_disk" ]; then
  [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  echo "No target disk was assigned!"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo "$msg_program_stop!"
  USAGE
  exit 1
fi

#
if [ "$batch_mode" != "yes" ]; then
  [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
  echo "This program will create a partition table in $target_disk"
  echo "ALL THE DATA IN THE TARGET DEVICE WILL BE ERASED!!!"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo -n "$msg_are_u_sure_u_want_to_continue ? (y/N) "
  read continue_confirm_ans
  case "$continue_confirm_ans" in
       y|Y|[yY][eE][sS])
          echo "$msg_ok_let_do_it!"
          ;;
       *)
          echo "$msg_program_stop!"
          exit 1
  esac
fi

# Check if GPT disk, if yes, exit
if `is_gpt_partitition_table_disk $target_disk`; then
  [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  echo "Disk $target_disk is GPT format. This program only works for MBR format."
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo "$msg_program_stop!"
  exit 1
fi

# No size info in sda-pt.sf, we have to use sda-pt.parted.
orig_parted_tab="${orig_sf/.sf/.parted}"
orig_parted_dir="$(dirname $orig_sf)"
if [ ! -e "$orig_parted_tab" ]; then
  [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  echo "$orig_parted_tab was not found! It is required so that we know the original disk size! Maybe your Clonezilla image is too old ? You can try to create such an file in your source machine by: \"parted -s /dev/$SOURCE_DEV unit s print > $orig_parted_tab\" (Replace $SOURCE_DEV with your device name)"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo "$msg_program_stop!"
  exit 1
fi

# parted output format example:
#  Disk /dev/sda: 16777215s
#  Sector size (logical/physical): 512B/512B
#  Partition Table: msdos
#  
#  Number  Start     End        Size       Type      File system  Flags
#   1      63s       586844s    586782s    primary                boot 
#   2      586845s   978074s    391230s    primary                     
#   3      978075s   1955204s   977130s    primary                     
#   4      1955205s  16776584s  14821380s  extended                    
#   5      1955268s  2151764s   196497s    logical                     
#   6      2151828s  2542994s   391167s    logical                     
#   7      2543058s  16776584s  14233527s  logical                     

ori_disk_size="$(LC_ALL=C grep -E "^Disk /dev" $orig_parted_tab | awk -F":" '{print $2}' | sed -e "s/s$//g")"
# If nothing in target disk, parted will show like this:
# sudo parted -s /dev/sda unit s print
# Error: Unable to open /dev/sda - unrecognised disk label.

if ! LC_ALL=C parted -s $target_disk unit s print &>/dev/null; then
  # Try to create a partition table so that we can read the size via parted -s $dev unit s print
  echo -n "No partition table exists in target disk $target_disk, try to initialize one so that we can get the disk size by sfdisk... "
  echo 1,,83 | sfdisk -f $target_disk &>/dev/null
  echo "done!"
fi
tgt_disk_size="$(LC_ALL=C parted -s $target_disk unit s print | grep -E "^Disk /dev" | awk -F":" '{print $2}' | sed -e "s/s$//g")"

# If target_disk size is larger than 2 TiB (~2.2 TB = 2,199,023,255,040 bytes), exit. It's over the MBR's limitation.
check_mbr_disk_size_gt_2TiB $target_disk exit

#
ratio=$(echo "scale=10; $tgt_disk_size / $ori_disk_size" | bc -l) || exit 1
echo "The ratio for target disk size to original disk size is $ratio."
if [ "$chk_tgt_disk_size_bf_mk_pt" = "yes" ]; then
  if [ "$(LC_ALL=C echo "$ratio < 1" | bc -l)" = "1" ]; then
    [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
    echo "The target disk (size=$tgt_disk_size sectors) is smaller than the source disk (size=$ori_disk_size sectors)!"
    echo "Clonezilla won't be able to restore a partition image to smaller partition!" 
    [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
    echo "Program terminated!"
    exit 1
  fi
fi

new_sf="$(mktemp /tmp/new_sf.XXXXXX)" || exit 1
new_sf_tmp="$(mktemp /tmp/new_sf_tmp.XXXXXX)" || exit 1
# Increase. Example for sfdisk format:
#  # partition table of /dev/sda
#  unit: sectors
#  
#  /dev/sda1 : start=       63, size=   586782, Id=83, bootable
#  /dev/sda2 : start=   586845, size=   391230, Id=82
#  /dev/sda3 : start=   978075, size=   977130, Id=83
#  /dev/sda4 : start=  1955205, size= 14821380, Id= 5
#  /dev/sda5 : start=  1955268, size=   196497, Id=83
#  /dev/sda6 : start=  2151828, size=   391167, Id=83
#  /dev/sda7 : start=  2543058, size= 14233527, Id=83
#  
# Or
#  /dev/sda1 : start=       63, size=   196497, Id=83
#  /dev/sda2 : start=   196560, size= 16580025, Id= 5
#  /dev/sda3 : start=        0, size=        0, Id= 0
#  /dev/sda4 : start=        0, size=        0, Id= 0
#  /dev/sda5 : start=   196623, size= 16579962, Id=83

# We only need those required info
grep -E "^/dev" $orig_sf > $new_sf_tmp
# Format the output, since something like "Id= 5" is not a good idea for us to parse
perl -pi -e "s/Id=[[:space:]]+/Id=/g" $new_sf_tmp
# start=291579750 or size=291563622 is not a good format for us to parse, we need a space between "=" and "number"
# i.e. 
# No good:
# /dev/sda1 : start=       63, size=291563622, Id= 7, bootable
# /dev/sda2 : start=291579750, size= 20980890, Id= 7
# /dev/sda3 : start=        0, size=        0, Id= 0
# /dev/sda4 : start=        0, size=        0, Id= 0
# 
# Good:
# /dev/sda1 : start=       63, size= 291563622, Id= 7, bootable
# /dev/sda2 : start= 291579750, size= 20980890, Id= 7
# /dev/sda3 : start=        0, size=        0, Id= 0
# /dev/sda4 : start=        0, size=        0, Id= 0

# //NOTE// For partitions number >=10, it looks like:
## partition table of /dev/sda
#unit: sectors
#
#/dev/sda1 : start=       63, size=   976562, Id=83
#/dev/sda2 : start=   976625, size=  1171875, Id=83
#/dev/sda3 : start=  2148500, size=  1367187, Id=83
#/dev/sda4 : start=  3515687, size= 13256173, Id= f
#/dev/sda5 : start=  3515750, size=   195312, Id=83
#/dev/sda6 : start=  3711063, size=   390624, Id=83
#/dev/sda7 : start=  4101688, size=   585936, Id=83
#/dev/sda8 : start=  4687625, size=   781249, Id=83
#/dev/sda9 : start=  5468875, size=   976561, Id=83
#/dev/sda10: start=  6445437, size=   976561, Id=83 <-- No space before ":"
#/dev/sda11: start=  7421999, size=   976561, Id=83

# Therefore we force to put a space no matter there is already space or not
perl -pi -e "s/start=/start= /g" $new_sf_tmp
perl -pi -e "s/size=/size= /g" $new_sf_tmp
# Remove ":" in the temp file, since it's only for parsing, won't be used for sfdisk /dev/... < $new_sf_tmp ...
perl -pi -e "s/://g" $new_sf_tmp

#
echo "unit: sectors" > $new_sf
echo "" >> $new_sf
start_no_keep=""
size_no_keep=""
extended_part=""
flag_1st_logic_drv="off"
append_to_next="0"
# Initial gap for the 1st partition. After this, it should be 0.
logical_part_gap="2"
while read dev start start_no size size_no id flag; do
  pt_no="$(LC_ALL=C get_part_number $dev | sed -r -e "s|^[^[:digit:]]*||g")"
  if `is_partition $dev` && [ "$pt_no" -le 4 ]; then
   # primary/extended partitions
    [ -z "$start_no_keep" ] && start_no_keep=${start_no/,/}  # The 1st one
    [ -z "$size_no_keep" ] && size_no_keep=0
    if [ "${size_no/,/}" -eq 0 ]; then
      start_no=0
      size_no=0
    else
      # If we found the partition is MS Windows (Vista, 7) "system reserved partition", i.e. size is about 100 MB (204800) or 200 MB (409600 sectors), and Id=7, and flag is bootable, not to expand it. i.e.:
      # /dev/sda1 : start=     2048, size=   204800, Id= 7, bootable
      # The files and dirs in MS Windows (Vista, 7) "system reserved partition"
      # drwxrwxrwx  1 root root 4.0K 2011-07-20 06:22 Boot/
      # -rwxrwxrwx  1 root root 375K 2009-07-14 01:38 bootmgr*
      # -rwxrwxrwx  1 root root 8.0K 2011-07-20 06:22 BOOTSECT.BAK*
      # drwxrwxrwx  1 root root    0 2011-07-20 06:31 System Volume Information/
      # //NOTE// The above files and dirs will be shown after restoring, not the time when creating partition table. Therefore we can not mount the partition and parse them.
      # Ref: http://windows7forums.com/windows-7-discussion/15629-hack-remove-100-mb-system-reserved-partition-when-installing-windows-7-a.html
      expand="true"
      if [ "${size_no/,/}" -eq "409600" -o "${size_no/,/}" -eq "204800" ]; then
        if [ -n "$(echo $id | grep -iE "(id|type)=7")" -a \
             -n "$(echo $flag | grep -iE "bootable")" ]; then
          expand="false"
          [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
	  echo "MS Windows (Vista or 7) \"system reserved partition\" found. Not to expand this partition."
          [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
        fi
      fi
      # For newer Clonezilla (>=2.4.36-1drbl), a tag file (sda1.info) might exist
      if [ -e "$orig_parted_dir/$(to_filename ${dev}).info" ]; then
	. $orig_parted_dir/$(to_filename ${dev}).info
	if [ "$PARTITION_TYPE" = "Win_boot_reserved" ]; then
          expand="false"
	fi
      fi
      # For Linux Swap partition
      if [ -n "$(echo $id | grep -iE "(id|type)=82")" ]; then
        [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
	echo "Linux swap partition \"$id\" found. Not to expand this partition."
        [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
        expand="false"
      fi

      if [ "$expand" = "true" ]; then
	start_no="$(LC_ALL=C printf "%.0f" "$(echo "($start_no_keep + $size_no_keep)" | bc -l)")"
	size_no="$(LC_ALL=C printf "%.0f" "$(echo "${size_no/,/}*$ratio + $append_to_next" | bc -l)")"
	# Reset the space append_to_next.
	append_to_next="0"
      else
	start_no="$(LC_ALL=C printf "%.0f" "$(echo "($start_no_keep + $size_no_keep)" | bc -l)")"
        size_no="${size_no/,/}"
	# Since we do not expand this "system reserved partition" or "swap partition", 
	# we append the space to the next partition.
	append_to_next="$(LC_ALL=C printf "%.0f" "$(echo "${size_no}*$ratio - ${size_no}" | bc -l)")"
      fi
    fi
    if [ "$size_no" -lt 0 ]; then
      # append_to_next might be nagtive when "-icds" is enabled and ration is < 1, therefore
      # we have to check the size_no.
      [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
      echo "The calculated size of $dev is < 0!"
      echo "Unable to create a smaller partitions layout."
      [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
      echo "$msg_program_stop!"
      exit 1
    fi
    if [ -n "$(echo $id | grep -iE "((id|type)=5|(id|type)=f)")" ]; then
      # keep the extended partition, we need it for logical partitions.
      extended_part="$dev"
      extended_start_no="$start_no"
      extended_size_no="$size_no"
    fi
    echo $dev : $start $start_no, $size $size_no, $id $flag >> $new_sf
    [ "$start_no" -ne 0 ] && start_no_keep="${start_no/,/}"
    [ "$size_no" -ne 0 ] && size_no_keep="${size_no/,/}"
  else
    # logical partitions
    if [ "$flag_1st_logic_drv" = "off" ]; then
      start_no_keep="$((extended_start_no))"
      size_no_keep="0"
      flag_1st_logic_drv="on"
    fi
    if [ "${size_no/,/}" -eq 0 ]; then
      start_no=0
      size_no=0
    else
      expand="true"
      # For Linux Swap partition
      if [ -n "$(echo $id | grep -iE "(id|type)=82")" ]; then
        [ "$BOOTUP" = "color" ] && $SETCOLOR_WARNING
	echo "Linux swap partition \"$id\" found. Not to expand this partition."
        [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
        expand="false"
      fi

      if [ "$expand" = "true" ]; then
	start_no="$(LC_ALL=C printf "%.0f" "$(echo "($start_no_keep+$size_no_keep+$logical_part_gap)" | bc -l)")"
	size_no="$(LC_ALL=C printf "%.0f" "$(echo "${size_no/,/}*$ratio + $append_to_next" | bc -l)")"
        logical_part_gap="0"
	# Reset the space append_to_next.
	append_to_next="0"
      else
	start_no="$(LC_ALL=C printf "%.0f" "$(echo "($start_no_keep+$size_no_keep+$logical_part_gap)" | bc -l)")"
        size_no="${size_no/,/}"
	# Since we do not expand the "swap partition", we append the space to the next partition.
	append_to_next="$(LC_ALL=C printf "%.0f" "$(echo "${size_no}*$ratio - ${size_no}" | bc -l)")"
      fi
    fi
    echo $dev : $start $start_no, $size $size_no, $id $flag >> $new_sf
    [ "$start_no" -ne 0 ] && start_no_keep="${start_no/,/}"
    [ "$size_no" -ne 0 ] && size_no_keep="${size_no/,/}"
  fi
done < $new_sf_tmp
# For sfdisk <= 0.25, only "Id=" is accepted, not "type=".
perl -pi -e "s/type=/Id=/g" $new_sf

echo "The partition table to write in $target_disk:"
echo "*****************************************"
cat $new_sf
echo "*****************************************"

# EXTRA_SFDISK_OPT is environment variable
# If not --force, we force to append it since by default if sfdisk find some CHS it does not like, it won't do it without --force
if [ -z "$(echo $EXTRA_SFDISK_OPT | grep -Ew -- "--force")" ]; then
  EXTRA_SFDISK_OPT="$EXTRA_SFDISK_OPT --force"
fi
echo "Running: sfdisk $EXTRA_SFDISK_OPT $target_disk < $new_sf"
LC_ALL=C sfdisk $EXTRA_SFDISK_OPT $target_disk < $new_sf
echo "Partition table was created by: sfdisk $EXTRA_SFDISK_OPT $target_disk < $new_sf"

[ -e "$new_sf" ] && rm -f $new_sf
[ -e "$new_sf_tmp" ] && rm -f $new_sf_tmp