sudo mkdir -p ~/rpi_mnt
pi@raspberrypi48:~ $ sudo losetup -f -P --show /mnt/runimg/2019-04-08-raspbian-stretch_chroot.img
/dev/loop0
pi@raspberrypi48:~ $ sudo mount /dev/loop0p2 -o rw ~/rpi_mnt
pi@raspberrypi48:~ $ cd ~/rpi_mnt
pi@raspberrypi48:~/rpi_mnt $ sudo mount --bind /dev ~/rpi_mnt/dev/
pi@raspberrypi48:~/rpi_mnt $ sudo mount --bind /sys ~/rpi_mnt/sys/
pi@raspberrypi48:~/rpi_mnt $ sudo mount --bind /proc ~/rpi_mnt/proc/
pi@raspberrypi48:~/rpi_mnt $ sudo mount --bind /dev/pts ~/rpi_mnt/dev/pts
pi@raspberrypi48:~/rpi_mnt $ sudo mkdir -p  undefined/undefined
pi@raspberrypi48:~/rpi_mnt $ sudo mkdir -p  ~/rpi_mnt/mnt/compile
pi@raspberrypi48:~/rpi_mnt $ sudo mount  --bind  undefined/undefined ~/rpi_mnt/mnt/compile
pi@raspberrypi48:~/rpi_mnt $ cd ~/rpi_mnt
pi@raspberrypi48:~/rpi_mnt $ sudo chroot . bin/bash
root@raspberrypi48:/# 
root@raspberrypi48:/# ls -l
total 80
drwxr-xr-x   2 root root  4096 Apr  8  2019 bin
drwxr-xr-x   2 root root  4096 Apr  8  2019 boot
drwxr-xr-x  18 root root  4040 Jan  7 13:10 dev
drwxr-xr-x 110 root root  4096 Dec 29 00:26 etc
drwxr-xr-x   3 root root  4096 Apr  8  2019 home
drwxr-xr-x  16 root root  4096 Apr  8  2019 lib
drwx------   2 root root 16384 Apr  8  2019 lost+found
drwxr-xr-x   3 root root  4096 Dec 29 00:07 media
drwxr-xr-x   3 root root  4096 Dec 29 00:06 mnt
drwxr-xr-x   4 root root  4096 Apr  8  2019 opt
dr-xr-xr-x 186 root root     0 Jan  1  1970 proc
drwx------   3 root root  4096 Dec 28 23:56 root
drwxr-xr-x   5 root root  4096 Apr  8  2019 run
drwxr-xr-x   2 root root  4096 Apr  8  2019 sbin
drwxr-xr-x   2 root root  4096 Apr  8  2019 srv
dr-xr-xr-x  12 root root     0 Jan  1  1970 sys
drwxrwxrwt   3 root root  4096 Dec 31 07:26 tmp
drwxr-xr-x   3 root root  4096 Jan  7 13:10 undefined
drwxr-xr-x  11 root root  4096 Apr  8  2019 usr
drwxr-xr-x  11 root root  4096 Apr  8  2019 var
root@raspberrypi48:/# echo 00:00:00
00:00:00
root@raspberrypi48:/# date
Tue Jan  7 13:10:41 GMT 2020
root@raspberrypi48:/# 
root@raspberrypi48:/# 
root@raspberrypi48:/# 
root@raspberrypi48:/# u cat /etc/apt/sources.list
deb http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
root@raspberrypi48:/# 
root@raspberrypi48:/# 
root@raspberrypi48:/# 
root@raspberrypi48:/# compile finish
bash: compile: command not found
root@raspberrypi48:/# exit
exit
pi@raspberrypi48:~/rpi_mnt $ cd 
pi@raspberrypi48:~ $ sudo umount  ~/rpi_mnt/mnt/compile
pi@raspberrypi48:~ $ sudo umount  ~/rpi_mnt/dev/pts
pi@raspberrypi48:~ $ sudo umount  ~/rpi_mnt/proc
pi@raspberrypi48:~ $ sudo umount  ~/rpi_mnt/sys
pi@raspberrypi48:~ $ sudo umount  ~/rpi_mnt/dev
pi@raspberrypi48:~ $ sudo umount  ~/rpi_mnt
pi@raspberrypi48:~ $ sudo losetup -d  /dev/loop0
pi@raspberrypi48:~ $