sudo mkdir -p /media/netdir
pi@raspberrypi4:~ $ sudo mount -v  nas-27-59-FD:/data/tmp   /media/netdir
mount.nfs: timeout set for Thu Jan  2 22:22:15 2020
mount.nfs: trying text-based options 'vers=4.2,addr=192.168.1.218,clientaddr=192.168.1.254'
mount.nfs: mount(2): Invalid argument
mount.nfs: trying text-based options 'vers=4.1,addr=192.168.1.218,clientaddr=192.168.1.254'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'vers=4.0,addr=192.168.1.218,clientaddr=192.168.1.254'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'addr=192.168.1.218'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.1.218 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.1.218 prog 100005 vers 3 prot UDP port 38114
mount.nfs: mount(2): Device or resource busy
pi@raspberrypi4:~ $ sudo mkdir -p /mnt/runimg
pi@raspberrypi4:~ $ sudo mount --bind /media/netdir/raspbrreyPi/mnt_runimg    /mnt/runimg
pi@raspberrypi4:~ $ sudo mkdir -p ~/rpi_mnt
pi@raspberrypi4:~ $ sudo losetup -f -P --show /mnt/runimg/2019-09-26-raspbian-buster_jin.img
/dev/loop0
pi@raspberrypi4:~ $ sudo mount /dev/loop0p2 -o rw ~/rpi_mnt
pi@raspberrypi4:~ $ cd ~/rpi_mnt
pi@raspberrypi4:~/rpi_mnt $ sudo mount --bind /dev ~/rpi_mnt/dev/
pi@raspberrypi4:~/rpi_mnt $ sudo mount --bind /sys ~/rpi_mnt/sys/
pi@raspberrypi4:~/rpi_mnt $ sudo mount --bind /proc ~/rpi_mnt/proc/
pi@raspberrypi4:~/rpi_mnt $ sudo mount --bind /dev/pts ~/rpi_mnt/dev/pts
pi@raspberrypi4:~/rpi_mnt $ sudo mkdir -p  /media/netdir/source/raspberrypi/4-07
pi@raspberrypi4:~/rpi_mnt $ sudo mkdir -p  ~/rpi_mnt/mnt/compile
pi@raspberrypi4:~/rpi_mnt $ sudo mount  --bind  /media/netdir/source/raspberrypi/4-07 ~/rpi_mnt/mnt/compile
pi@raspberrypi4:~/rpi_mnt $ cd ~/rpi_mnt
pi@raspberrypi4:~/rpi_mnt $ sudo chroot . bin/bash
root@raspberrypi4:/# 
root@raspberrypi4:/# passwd pi
New password: 
Retype new password: 
passwd: password updated successfully
root@raspberrypi4:/# passwd root
New password: 
Retype new password: 
passwd: password updated successfully
root@raspberrypi4:/# date
Thu Jan  2 13:20:22 GMT 2020
root@raspberrypi4:/# 
root@raspberrypi4:/# compile finish
bash: compile: command not found
root@raspberrypi4:/# exit
exit
pi@raspberrypi4:~/rpi_mnt $ cd 
pi@raspberrypi4:~ $ sudo umount  ~/rpi_mnt/mnt/compile
pi@raspberrypi4:~ $ sudo umount  ~/rpi_mnt/dev/pts
pi@raspberrypi4:~ $ sudo umount  ~/rpi_mnt/proc
pi@raspberrypi4:~ $ sudo umount  ~/rpi_mnt/sys
pi@raspberrypi4:~ $ sudo umount  ~/rpi_mnt/dev
pi@raspberrypi4:~ $ sudo umount  ~/rpi_mnt
pi@raspberrypi4:~ $ sudo losetup -d  /dev/loop0
pi@raspberrypi4:~ $