sudo mkdir -p /mnt/runimg
pi@raspberry4:~ $ sudo mount --bind /media/netdir/raspbrreyPi/mnt_runimg    /mnt/runimg
pi@raspberry4:~ $ ls -l /mnt/runimg/
total 24593408
-rwxrwxrwx+ 1               99   99 4555014144 Jan  7 22:32 2019-04-08-raspbian-stretch_chroot.img
-rwxrwxrwx+ 1 systemd-timesync   98 3481272320 Mar 23 22:09 2019-04-08-raspbian-stretch-make-new.img
-rwxrwxrwx+ 1 root             root 3481272320 Dec 30 09:55 2019-04-08-raspbian-stretch-make-old.img
-rwx------+ 1               99   99 3829399552 Jan 26 21:38 2019-09-26-raspbian-buster_jin.img
-rw-r--r--+ 1 root             root 5934940160 Apr 13 22:14 2020-02-13-raspbian-buster_jin-make.img
drwxrwxrwx+ 1 root             root        160 Dec 19 22:41 bak
-rw-rw-rw-+ 1               99   99 1728053248 Mar 25 22:50 readynas_compile_tool2.img
-rw-rw-rw-+ 1               99   99 2173698048 Jan  8 23:25 readynas_compile_tool.img
pi@raspberry4:~ $ sudo mkdir -p ~/rpi_mnt
pi@raspberry4:~ $ sudo losetup -f -P --show /mnt/runimg/2020-02-13-raspbian-buster_jin-make.img
/dev/loop1
pi@raspberry4:~ $ sudo mount /dev/loop0p2 -o rw ~/rpi_mnt
pi@raspberry4:~ $ cd ~/rpi_mnt
pi@raspberry4:~/rpi_mnt $ sudo mount /dev/loop0p1 -o rw ~/rpi_mnt/boot/
pi@raspberry4:~/rpi_mnt $ sudo mount --bind /dev ~/rpi_mnt/dev/
pi@raspberry4:~/rpi_mnt $ sudo mount --bind /sys ~/rpi_mnt/sys/
pi@raspberry4:~/rpi_mnt $ sudo mount --bind /proc ~/rpi_mnt/proc/
pi@raspberry4:~/rpi_mnt $ sudo mount --bind /dev/pts ~/rpi_mnt/dev/pts
pi@raspberry4:~/rpi_mnt $ sudo mkdir -p  /media/netdir/source/raspberrypi/4-08_new_raspi
pi@raspberry4:~/rpi_mnt $ sudo mkdir -p  ~/rpi_mnt/mnt/compile
pi@raspberry4:~/rpi_mnt $ sudo mount  --bind  /media/netdir/source/raspberrypi/4-08_new_raspi ~/rpi_mnt/mnt/compile
pi@raspberry4:~/rpi_mnt $ cd ~/rpi_mnt
pi@raspberry4:~/rpi_mnt $ sudo chroot . bin/bash
root@raspberry4:/# 
root@raspberry4:/# ls -l
total 75
drwxr-xr-x   2 root root  4096 Feb 14 01:00 bin
drwxr-xr-x   3 root root  3072 Jan  1  1970 boot
drwxr-xr-x  18 root root  4060 Apr 13 22:18 dev
drwxr-xr-x 108 root root  4096 Apr  1 21:50 etc
drwxr-xr-x   3 root root  4096 Feb 14 00:55 home
drwxr-xr-x  16 root root  4096 Feb 14 00:58 lib
drwx------   2 root root 16384 Feb 14 01:15 lost+found
drwxr-xr-x   2 root root  4096 Feb 14 00:51 media
drwxr-xr-x   3 root root  4096 Mar 21 13:47 mnt
drwxr-xr-x   4 root root  4096 Feb 14 01:01 opt
dr-xr-xr-x 151 root root     0 Jan  1  1970 proc
drwx------   3 root root  4096 Mar 21 13:54 root
drwxr-xr-x   4 root root  4096 Feb 14 00:51 run
drwxr-xr-x   2 root root  4096 Feb 14 01:00 sbin
drwxr-xr-x   2 root root  4096 Feb 14 00:51 srv
dr-xr-xr-x  12 root root     0 Apr 13 21:56 sys
drwxrwxrwt   3 root root  4096 Apr  1 22:52 tmp
drwxr-xr-x  11 root root  4096 Feb 14 01:01 usr
drwxr-xr-x  11 root root  4096 Feb 14 00:51 var
root@raspberry4:/# echo 00:00:00
00:00:00
root@raspberry4:/# date
Mon 13 Apr 2020 10:18:29 PM JST
root@raspberry4:/# cd /bdf -hT
Filesystem                                               Type      Size  Used Avail Use% Mounted on
/dev/loop0p2                                             ext4      5.2G  2.9G  2.1G  59% /
/dev/loop0p1                                             vfat      253M   53M  200M  21% /boot
udev                                                     devtmpfs  1.8G     0  1.8G   0% /dev
nas-27-59-FD:/data/tmp/source/raspberrypi/4-08_new_raspi nfs       5.5T  3.4T  2.2T  62% /mnt/compile
root@raspberry4:/# cd /boot
root@raspberry4:/boot# ls -l
total 52964
-rwxr-xr-x 1 root root    23983 Feb  3 21:50 bcm2708-rpi-b.dtb
-rwxr-xr-x 1 root root    24246 Feb  3 21:50 bcm2708-rpi-b-plus.dtb
-rwxr-xr-x 1 root root    23764 Feb  3 21:50 bcm2708-rpi-cm.dtb
-rwxr-xr-x 1 root root    23688 Feb  3 21:50 bcm2708-rpi-zero.dtb
-rwxr-xr-x 1 root root    24424 Feb  3 21:50 bcm2708-rpi-zero-w.dtb
-rwxr-xr-x 1 root root    25310 Feb  3 21:50 bcm2709-rpi-2-b.dtb
-rwxr-xr-x 1 root root    25439 Feb  3 21:50 bcm2710-rpi-2-b.dtb
-rwxr-xr-x 1 root root    26480 Feb  3 21:50 bcm2710-rpi-3-b.dtb
-rwxr-xr-x 1 root root    27099 Feb  3 21:50 bcm2710-rpi-3-b-plus.dtb
-rwxr-xr-x 1 root root    25294 Feb  3 21:50 bcm2710-rpi-cm3.dtb
-rwxr-xr-x 1 root root    40988 Feb  3 21:50 bcm2711-rpi-4-b.dtb
-rwxr-xr-x 1 root root    52304 Jan 17 19:01 bootcode.bin
-rwxr-xr-x 1 root root      208 Feb 14 01:16 cmdline.txt
-rwxr-xr-x 1 root root     1784 Feb 14 00:57 config.txt
-rwxr-xr-x 1 root root    18693 Jun 25  2019 COPYING.linux
-rwxr-xr-x 1 root root     3112 Feb 12 22:33 fixup4cd.dat
-rwxr-xr-x 1 root root     6200 Feb 12 22:33 fixup4.dat
-rwxr-xr-x 1 root root     9192 Feb 12 22:30 fixup4db.dat
-rwxr-xr-x 1 root root     9192 Feb 12 22:33 fixup4x.dat
-rwxr-xr-x 1 root root     2656 Feb  6 00:25 fixup_cd.dat
-rwxr-xr-x 1 root root     6745 Feb  6 00:25 fixup.dat
-rwxr-xr-x 1 root root     9817 Feb  6 00:25 fixup_db.dat
-rwxr-xr-x 1 root root     9819 Feb  6 00:25 fixup_x.dat
-rwxr-xr-x 1 root root      145 Feb 14 01:16 issue.txt
-rwxr-xr-x 1 root root  5424376 Feb  3 21:50 kernel7.img
-rwxr-xr-x 1 root root  5757200 Feb  3 21:50 kernel7l.img
-rwxr-xr-x 1 root root 13521408 Feb  3 21:50 kernel8.img
-rwxr-xr-x 1 root root  5142912 Feb  3 21:50 kernel.img
-rwxr-xr-x 1 root root     1594 Jan 17 19:01 LICENCE.broadcom
drwxr-xr-x 2 root root    15872 Feb 14 00:55 overlays
-rwxr-xr-x 1 root root   784316 Feb 12 22:33 start4cd.elf
-rwxr-xr-x 1 root root  4593508 Feb 12 22:33 start4db.elf
-rwxr-xr-x 1 root root  2784800 Feb 12 22:33 start4.elf
-rwxr-xr-x 1 root root  3546468 Feb 12 22:33 start4x.elf
-rwxr-xr-x 1 root root   690884 Feb 12 22:33 start_cd.elf
-rwxr-xr-x 1 root root  4859912 Feb 12 22:33 start_db.elf
-rwxr-xr-x 1 root root  2883204 Feb 12 22:33 start.elf
-rwxr-xr-x 1 root root  3797384 Feb 12 22:33 start_x.elf
root@raspberry4:/boot# cat cmdline.txt
console=serial0,115200 console=tty1 root=PARTUUID=ea7d04d6-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet init=/usr/lib/raspi-config/init_resize.sh splash plymouth.ignore-serial-consoles
root@raspberry4:/boot# 
root@raspberry4:/boot# 
root@raspberry4:/boot# df -hT
Filesystem                                               Type      Size  Used Avail Use% Mounted on
/dev/loop0p2                                             ext4      5.2G  2.9G  2.1G  59% /
/dev/loop0p1                                             vfat      253M   53M  200M  21% /boot
udev                                                     devtmpfs  1.8G     0  1.8G   0% /dev
nas-27-59-FD:/data/tmp/source/raspberrypi/4-08_new_raspi nfs       5.5T  3.4T  2.2T  62% /mnt/compile
root@raspberry4:/boot# cd /usr/lib/raspi-config/
root@raspberry4:/usr/lib/raspi-config# ls -l
total 12
-rwxr-xr-x 1 root root  187 Jan 10 00:22 cmstart.sh
-rwxr-xr-x 1 root root 4964 Jan 10 00:22 init_resize.sh
root@raspberry4:/usr/lib/raspi-config# cat init_resize.sh
#!/bin/sh

reboot_pi () {
  umount /boot
  mount / -o remount,ro
  sync
  if [ "$NOOBS" = "1" ]; then
    if [ "$NEW_KERNEL" = "1" ]; then
      reboot -f "$BOOT_PART_NUM"
    else
      echo "$BOOT_PART_NUM" > "/sys/module/${BCM_MODULE}/parameters/reboot_part"
    fi
  fi
  echo b > /proc/sysrq-trigger
  sleep 5
  exit 0
}

check_commands () {
  if ! command -v whiptail > /dev/null; then
      echo "whiptail not found"
      sleep 5
      return 1
  fi
  for COMMAND in grep cut sed parted fdisk findmnt partprobe; do
    if ! command -v $COMMAND > /dev/null; then
      FAIL_REASON="$COMMAND not found"
      return 1
    fi
  done
  return 0
}

check_noobs () {
  if [ "$BOOT_PART_NUM" = "1" ]; then
    NOOBS=0
  else
    NOOBS=1
  fi
}

get_variables () {
  ROOT_PART_DEV=$(findmnt / -o source -n)
  ROOT_PART_NAME=$(echo "$ROOT_PART_DEV" | cut -d "/" -f 3)
  ROOT_DEV_NAME=$(echo /sys/block/*/"${ROOT_PART_NAME}" | cut -d "/" -f 4)
  ROOT_DEV="/dev/${ROOT_DEV_NAME}"
  ROOT_PART_NUM=$(cat "/sys/block/${ROOT_DEV_NAME}/${ROOT_PART_NAME}/partition")

  BOOT_PART_DEV=$(findmnt /boot -o source -n)
  BOOT_PART_NAME=$(echo "$BOOT_PART_DEV" | cut -d "/" -f 3)
  BOOT_DEV_NAME=$(echo /sys/block/*/"${BOOT_PART_NAME}" | cut -d "/" -f 4)
  BOOT_PART_NUM=$(cat "/sys/block/${BOOT_DEV_NAME}/${BOOT_PART_NAME}/partition")

  OLD_DISKID=$(fdisk -l "$ROOT_DEV" | sed -n 's/Disk identifier: 0x\([^ ]*\)/\1/p')

  check_noobs

  ROOT_DEV_SIZE=$(cat "/sys/block/${ROOT_DEV_NAME}/size")
  TARGET_END=$((ROOT_DEV_SIZE - 1))

  PARTITION_TABLE=$(parted -m "$ROOT_DEV" unit s print | tr -d 's')

  LAST_PART_NUM=$(echo "$PARTITION_TABLE" | tail -n 1 | cut -d ":" -f 1)

  ROOT_PART_LINE=$(echo "$PARTITION_TABLE" | grep -e "^${ROOT_PART_NUM}:")
  ROOT_PART_START=$(echo "$ROOT_PART_LINE" | cut -d ":" -f 2)
  ROOT_PART_END=$(echo "$ROOT_PART_LINE" | cut -d ":" -f 3)

  if [ "$NOOBS" = "1" ]; then
    EXT_PART_LINE=$(echo "$PARTITION_TABLE" | grep ":::;" | head -n 1)
    EXT_PART_NUM=$(echo "$EXT_PART_LINE" | cut -d ":" -f 1)
    EXT_PART_START=$(echo "$EXT_PART_LINE" | cut -d ":" -f 2)
    EXT_PART_END=$(echo "$EXT_PART_LINE" | cut -d ":" -f 3)
  fi
}

fix_partuuid() {
  DISKID="$(fdisk -l "$ROOT_DEV" | sed -n 's/Disk identifier: 0x\([^ ]*\)/\1/p')"

  sed -i "s/${OLD_DISKID}/${DISKID}/g" /etc/fstab
  sed -i "s/${OLD_DISKID}/${DISKID}/" /boot/cmdline.txt
}

check_variables () {
  if [ "$NOOBS" = "1" ]; then
    if [ "$EXT_PART_NUM" -gt 4 ] || \
       [ "$EXT_PART_START" -gt "$ROOT_PART_START" ] || \
       [ "$EXT_PART_END" -lt "$ROOT_PART_END" ]; then
      FAIL_REASON="Unsupported extended partition"
      return 1
    fi
  fi

  if [ "$BOOT_DEV_NAME" != "$ROOT_DEV_NAME" ]; then
      FAIL_REASON="Boot and root partitions are on different devices"
      return 1
  fi

  if [ "$ROOT_PART_NUM" -ne "$LAST_PART_NUM" ]; then
    FAIL_REASON="Root partition should be last partition"
    return 1
  fi

  if [ "$ROOT_PART_END" -gt "$TARGET_END" ]; then
    FAIL_REASON="Root partition runs past the end of device"
    return 1
  fi

  if [ ! -b "$ROOT_DEV" ] || [ ! -b "$ROOT_PART_DEV" ] || [ ! -b "$BOOT_PART_DEV" ] ; then
    FAIL_REASON="Could not determine partitions"
    return 1
  fi
}

check_kernel () {
  local MAJOR=$(uname -r | cut -f1 -d.)
  local MINOR=$(uname -r | cut -f2 -d.)
  if [ "$MAJOR" -eq "4" ] && [ "$MINOR" -lt "9" ]; then
    return 0
  fi
  if [ "$MAJOR" -lt "4" ]; then
    return 0
  fi
  NEW_KERNEL=1
}

main () {
  get_variables

  if ! check_variables; then
    return 1
  fi

  check_kernel

  if [ "$NOOBS" = "1" ] && [ "$NEW_KERNEL" != "1" ]; then
    BCM_MODULE=$(grep -e "^Hardware" /proc/cpuinfo | cut -d ":" -f 2 | tr -d " " | tr '[:upper:]' '[:lower:]')
    if ! modprobe "$BCM_MODULE"; then
      FAIL_REASON="Couldn't load BCM module $BCM_MODULE"
      return 1
    fi
  fi

  if [ "$ROOT_PART_END" -eq "$TARGET_END" ]; then
    reboot_pi
  fi

  if [ "$NOOBS" = "1" ]; then
    if ! parted -m "$ROOT_DEV" u s resizepart "$EXT_PART_NUM" yes "$TARGET_END"; then
      FAIL_REASON="Extended partition resize failed"
      return 1
    fi
  fi

  if ! parted -m "$ROOT_DEV" u s resizepart "$ROOT_PART_NUM" "$TARGET_END"; then
    FAIL_REASON="Root partition resize failed"
    return 1
  fi

  partprobe "$ROOT_DEV"
  fix_partuuid

  return 0
}

mount -t proc proc /proc
mount -t sysfs sys /sys
mount -t tmpfs tmp /run
mkdir -p /run/systemd

mount /boot
mount / -o remount,rw

sed -i 's| init=/usr/lib/raspi-config/init_resize\.sh||' /boot/cmdline.txt
sed -i 's| sdhci\.debug_quirks2=4||' /boot/cmdline.txt

if ! grep -q splash /boot/cmdline.txt; then
  sed -i "s/ quiet//g" /boot/cmdline.txt
fi
sync

echo 1 > /proc/sys/kernel/sysrq

if ! check_commands; then
  reboot_pi
fi

if main; then
  whiptail --infobox "Resized root filesystem. Rebooting in 5 seconds..." 20 60
  sleep 5
else
  sleep 5
  whiptail --msgbox "Could not expand filesystem, please try raspi-config or rc_gui.\n${FAIL_REASON}" 20 60
fi

reboot_pi
root@raspberry4:/usr/lib/raspi-config# 
root@raspberry4:/usr/lib/raspi-config# 
root@raspberry4:/usr/lib/raspi-config# 
root@raspberry4:/usr/lib/raspi-config# 
root@raspberry4:/usr/lib/raspi-config# 
root@raspberry4:/usr/lib/raspi-config# 
root@raspberry4:/usr/lib/raspi-config# compile finish
bash: compile: command not found
root@raspberry4:/usr/lib/raspi-config# exit
exit
pi@raspberry4:~/rpi_mnt $ cd 
pi@raspberry4:~ $ sudo umount  ~/rpi_mnt/mnt/compile
pi@raspberry4:~ $ sudo umount  ~/rpi_mnt/dev/pts
pi@raspberry4:~ $ sudo umount  ~/rpi_mnt/proc
pi@raspberry4:~ $ sudo umount  ~/rpi_mnt/sys
pi@raspberry4:~ $ sudo umount  ~/rpi_mnt/dev
pi@raspberry4:~ $ sudo umount  ~/rpi_mnt
umount: /home/pi/rpi_mnt: target is busy.
pi@raspberry4:~ $ sudo losetup -d  /dev/loop0
pi@raspberry4:~ $