script to create fake flash drive and mount a JFFS2 image to it

mount_jffs2.sh

#!/bin/bash

# change this if needed
TOTAL_RAM_SIZE=32768
ERASE_SIZE=256

# just the usage prompt
print_usage() {
    echo "usage ./mount_jffs2.sh [ path to image ]"
    echo "RUN THIS WITH SUDO / AS ROOT"
}

echo "[+] this script creates a fake flash drive"
echo "    and mounts a JFFS2 image to it."

# check if arg was supplied
if [ "$#" -ne 1 ]; then
    print_usage
    exit 1
fi

# check if root perms
if [ "$EUID" -ne 0 ]; then 
    print_usage
    exit 1
fi

echo "[+] modprobe mtdram and mtdblock"

# mtdram - simulates NOR flash in RAM
# mtdblock - presents flash memory as a block device you can use to 
# format and mount as a filesystem

modprobe mtdram total_size=$TOTAL_RAM_SIZE erase_size=$ERASE_SIZE
modprobe mtdblock

echo "[+] created /mnt/disk to mount to"
mkdir -p /mnt/disk

echo "[+] using dd to write image to /dev/mtdblock0"
dd if=$1 of=/dev/mtdblock0

echo "[+] mounting image to /mnt/disk"
mount -t jffs2 /dev/mtdblock0 /mnt/disk

echo "[+] done, see /mnt/disk:"
ls -l /mnt/disk%