jffs2extract.sh

#!/bin/bash

#  Copyright notice
#  ================
#  
#  Copyright (C) 2014
#      Emilio Pinna     <emilio.pinn@gmail.com>
#  
#  This program is free software: you can redistribute it and/or modify it under
#  the terms of the GNU General Public License as published by the Free Software
#  Foundation, either version 3 of the License, or (at your option) any later
#  version.
#  
#  Cooxie is distributed in the hope that it will be useful, but WITHOUT ANY
#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
#  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
#  
#  You should have received a copy of the GNU General Public License along with
#  this program. If not, see <http://www.gnu.org/licenses/>.


# Argument check
if [ $# -ne 1 ]
  then
    printf "Error.\nUsage: ./jffs2mount.sh <jffs2 image>\n" 1>&2
    exit 1
fi

# UID check
if [[ $EUID -ne 0 ]]; then
   printf "Error.\nThis script must be run as root.\n" 1>&2
   exit 1
fi

# Skip if target folder already exists
mnt_folder="${1}_FS"
if [ -d "$mnt_folder" ]; then
   printf "Error.\nFolder $mnt_folder already exists, skipping mount.\n" 1>&2
   exit 1
fi

# Redundant module loading - who cares
modprobe mtd
modprobe jffs2
modprobe mtdram total_size=16384 erase_size=512
#modprobe mtdchar
modprobe mtdblock

# Jffs2 odd mount procedure
dd if=${1} of=/dev/mtd0
mnt_temp=`mktemp -d`
mount -t jffs2 /dev/mtdblock0 $mnt_temp

# Copy filesystem content in ${1}_FS
mkdir $mnt_folder
cp $mnt_temp/* $mnt_folder/ -rf
umount $mnt_temp
 
chown -R $SUDO_USER: $mnt_folder/

# Success!
printf "Success.\nData copied in $mnt_folder.\n"