Bsrgvty

I downloaded a device firmware file named zetnu.xilinx-201907311618-autofreq-user-Update2UBI-NF-sig.tar.gz

I extracted the above file and these are the contents:

• BOOT.bin


• devicetree.dtb


• rootfs.jffs2


• uImage

Next to these files was a file to install called runme.sh

This file's content is this:

#!/bin/sh -e

path=$(pwd)
cp_config="all"
if [ ! -d /mnt/upgrade ];
then
 mkdir /mnt/upgrade
fi

if [ -e /usr/bin/ctrl_bd ]; then
ret=`cat /usr/bin/ctrl_bd | grep "XILINX" | wc -l`
else
ret=0
fi

if [ $ret -eq 1 ];then
 cd ./xilinx

 if [ -e /dev/ubi_ctrl ];then

 if [ ! -d /mnt/config ];then
 mkdir /mnt/config
 fi
 ubiattach /dev/ubi_ctrl -m 2
 mount -t ubifs ubi1:rootfs /mnt/config
 if [ ! -d /mnt/config/home/usr_config ];then
 mkdir /mnt/config/home/usr_config
 fi

 if [ `ls /mnt/config/home/usr_config | wc -l` -gt 1 ];then
 cp_config="all" #cp -r /config/* /mnt/config/home/usr_config/
 else
 cp_config="mac" #cp -r /config/mac /mnt/config/home/usr_config/
 fi

 umount /mnt/config
 ubidetach -d 1 /dev/ubi_ctrl
 fi

 if [ -e BOOT.bin ]; then
 flash_erase /dev/mtd0 0x0 0x80 >/dev/null 2>&1
 nandwrite -p -s 0x0 /dev/mtd0 ./BOOT.bin >/dev/null 2>&1
 rm -rf BOOT.bin
 fi

 if [ -e devicetree.dtb ]; then
 flash_erase /dev/mtd0 0x1020000 0x1 >/dev/null 2>&1
 nandwrite -p -s 0x1020000 /dev/mtd0 ./devicetree.dtb >/dev/null 2>&1
 rm devicetree.dtb
 fi

 if [ -e uImage ]; then 
 flash_erase /dev/mtd0 0x1100000 0x40 >/dev/null 2>&1
 nandwrite -p -s 0x1100000 /dev/mtd0 ./uImage >/dev/null 2>&1
 rm uImage
 fi

 if [ -e rootfs.jffs2 ]; then
 if [ -f /dev/mtd3 ];then
 flash_erase /dev/mtd2 0x0 0x1E0 >/dev/null 2>&1
 else
 flash_erase /dev/mtd2 0x0 0x280 >/dev/null 2>&1
 fi
 nandwrite -p -s 0x0 /dev/mtd2 ./rootfs.jffs2 >/dev/null 2>&1
 rm rootfs.jffs2
 fi

 if [ -e /dev/ubi_ctrl ];then
 if [ ! -d /mnt/config ];then
 mkdir /mnt/config
 fi
 ubiattach /dev/ubi_ctrl -m 2
 mount -t ubifs ubi1:rootfs /mnt/config
 if [ ! -d /mnt/config/home/usr_config ];then
 mkdir /mnt/config/home/usr_config
 fi
 if [ $cp_config == "all" ];then
 cp -r /config/* /mnt/config/home/usr_config/
 if [ -e ../lighttpd-htdigest.user ]; then
 line1=`cat ../lighttpd-htdigest.user | wc -c`
 if [ $line1 != "0" ]; then
 cp -r ../lighttpd-htdigest.user /mnt/config/home/usr_config/lighttpd-htdigest.user
 if [ -e ../shadow ]; then
 line2=`cat ../shadow | wc -c`
 if [ $line2 != "0" ]; then
 cp /etc/shadow /mnt/config/home/usr_config/shadow
 old_shd=`sed -n '1p' /mnt/config/home/usr_config/shadow`
 o1=`echo $old_shd:5`
 o2=$o1#*:

 new_shd=`cat ../shadow`
 n1=$new_shd":"$o2

 sed -i '1d' /mnt/config/home/usr_config/shadow
 sed -i "1i $(echo $n1)" /mnt/config/home/usr_config/shadow
 fi
 fi
 fi
 fi
 else
 cp -r /config/mac /mnt/config/home/usr_config/
 fi
 sync
 umount /mnt/config
 ubidetach -d 1 /dev/ubi_ctrl
 fi

 if [ -e /dev/ubi_ctrl ];then
 ubiattach /dev/ubi_ctrl -m 2
 mount -t ubifs ubi1:rootfs /mnt/upgrade

 cd /mnt/upgrade/upgrade
 rm -rf /mnt/upgrade/upgrade/*
 cd $path

 if [ -e ./xilinx/angstrom_rootfs.jffs2 ];then
 cp -rf ./xilinx/angstrom_rootfs.jffs2 /mnt/upgrade/upgrade
 if [ -f /dev/mtd3 ];then
 flash_erase /dev/mtd3 0 0xa0 >/dev/null 2>&1
 fi
 fi
 flash_erase /dev/mtd0 0x1040000 0x1 >/dev/null 2>&1
 nandwrite -p -s 0x1040000 /dev/mtd0 ./xilinx/upgrade-marker.bin >/dev/null 2>&1

 sync

 umount /mnt/upgrade
 ubidetach -d 1 /dev/ubi_ctrl
 fi 
else
 echo "this is not for c5"
fi

rm -rf *.tar.gz


#/sbin/reboot -f &

Above code used nandwrite to write in a device.

Now, I want to mount these images to a directory or partitions. and add or change some things to these images. Next write again to images.

How can I do it?

Step 1, I just want to mount and read files and directories.