sudo mkdir -p /mnt/runimg
pi@raspberry49:~ $ sudo mount --bind /media/netdir/raspbrreyPi/mnt_runimg    /mnt/runimg
pi@raspberry49:~ $ ls -l /mnt/runimg/
total 85492784
-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 22:23 2020-02-13-raspbian-buster_jin-make.img
-rw-rw-rw-+ 1 root             root 31180455936 Apr 14 20:39 aarch64_bak.img
-rw-rw-rw-+ 1 root             root 31180455936 Apr 14 22:22 aarch64.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@raspberry49:~ $ sudo mkdir -p ~/rpi_mnt
pi@raspberry49:~ $ sudo losetup -f -P --show /mnt/runimg/aarch64.img
/dev/loop0
pi@raspberry49:~ $ sudo mount /dev/loop0p2 -o rw ~/rpi_mnt
pi@raspberry49:~ $ cd ~/rpi_mnt
pi@raspberry49:~/rpi_mnt $ sudo mount /dev/loop0p1 -o rw ~/rpi_mnt/boot/
pi@raspberry49:~/rpi_mnt $ sudo mount --bind /dev ~/rpi_mnt/dev/
pi@raspberry49:~/rpi_mnt $ sudo mount --bind /sys ~/rpi_mnt/sys/
pi@raspberry49:~/rpi_mnt $ sudo mount --bind /proc ~/rpi_mnt/proc/
pi@raspberry49:~/rpi_mnt $ sudo mount --bind /dev/pts ~/rpi_mnt/dev/pts
pi@raspberry49:~/rpi_mnt $ sudo mkdir -p  /media/netdir/source/raspberrypi/4-08_new_raspi
pi@raspberry49:~/rpi_mnt $ sudo mkdir -p  ~/rpi_mnt/mnt/compile
pi@raspberry49:~/rpi_mnt $ sudo mount  --bind  /media/netdir/source/raspberrypi/4-08_new_raspi ~/rpi_mnt/mnt/compile
pi@raspberry49:~/rpi_mnt $ cd ~/rpi_mnt
pi@raspberry49:~/rpi_mnt $ sudo chroot . bin/bash
I have no name!@raspberry49:/# 
I have no name!@raspberry49:/# 
I have no name!@raspberry49:/# cat /etc/fstab 
proc            /proc           proc    defaults          0       0
PARTUUID=ea7d04d6-01  /boot           vfat    defaults          0       2
PARTUUID=ea7d04d6-02  /               ext4    defaults,noatime  0       1
nas-27-59-FD:/data/Videos    /home/pi/Videos      nfs    rsize=8192,wsize=8192,timeo=14,_netdev 0 0
/dev/mmcblk0p3       /mnt/DISK1      ext4    rw      0       0
#/dev/mmcblk0p4       /mnt/DISK1      ext4    rw      0       0
## nas-27-59-FD:/data/tmp/raspbrreyPi/mnt_DISK1       /mnt/DISK1      nfs    rsize=8192,wsize=8192,timeo=14,_netdev 0 0
nas-27-59-FD:/data/tmp/raspbrreyPi/mnt_tools       /mnt/tools      nfs    rsize=8192,wsize=8192,timeo=14,_netdev 0 0
nas-27-59-FD:/data/tmp/       /media/netdir      nfs    rsize=8192,wsize=8192,timeo=14,_netdev 0 0
I have no name!@raspberry49:/# root@raspberry49:
bash: root@raspberry49:: command not found
I have no name!@raspberry49:/# ls -l
total 56
lrwxrwxrwx   1 0 0     7 Apr 14 11:11 bin -> usr/bin
drwxr-xr-x   3 0 0  3584 Jan  1  1970 boot
drwxr-xr-x   2 0 0  4096 Apr 14 11:12 debootstrap
drwxr-xr-x  17 0 0  4000 Apr 14 13:23 dev
drwxr-xr-x  27 0 0  4096 Apr 14 11:12 etc
drwxr-xr-x   2 0 0  4096 Feb  1 17:09 home
lrwxrwxrwx   1 0 0     7 Apr 14 11:11 lib -> usr/lib
drwx------   2 0 0 16384 Apr 14 10:59 lost+found
drwxr-xr-x   3 0 0  4096 Apr 14 11:41 mnt
dr-xr-xr-x 174 0 0     0 Jan  1  1970 proc
drwx------   2 0 0  4096 Apr 14 13:20 root
drwxr-xr-x   2 0 0  4096 Feb  1 17:09 run
lrwxrwxrwx   1 0 0     8 Apr 14 11:11 sbin -> usr/sbin
dr-xr-xr-x  12 0 0     0 Apr 14 13:10 sys
drwxrwxrwt   2 0 0  4096 Feb  1 17:09 tmp
drwxr-xr-x   9 0 0  4096 Apr 14 11:11 usr
drwxr-xr-x  11 0 0  4096 Apr 14 11:11 var
I have no name!@raspberry49:/# root@raspberry49:echo 00:00:03
bash: root@raspberry49:echo: command not found
I have no name!@raspberry49:/# date
Tue Apr 14 13:24:36 UTC 2020
I have no name!@raspberry49:/# root@raspberry49:                 compile finish
bash: compile: command not found
I have no name!@raspberry49:/# exit
exit
pi@raspberry49:~/rpi_mnt $ cd 
pi@raspberry49:~ $ sudo umount  ~/rpi_mnt/mnt/compile
pi@raspberry49:~ $ sudo umount  ~/rpi_mnt/dev/pts
pi@raspberry49:~ $ sudo umount  ~/rpi_mnt/proc
pi@raspberry49:~ $ sudo umount  ~/rpi_mnt/sys
pi@raspberry49:~ $ sudo umount  ~/rpi_mnt/dev
pi@raspberry49:~ $ sudo umount  ~/rpi_mnt/boot
pi@raspberry49:~ $ sudo umount  ~/rpi_mnt
pi@raspberry49:~ $ sudo losetup -d  /dev/loop0
pi@raspberry49:~ $