Create rooted image from factory image

mkrom.sh

#!/bin/bash -e

factory_img='soju-jro03e-factory-c9f5a67d.tgz'
su_bin='su-bin-3.1.1-arm-signed.zip'

mkdir -pv ~/custom_rom
cd ~/custom_rom

wget -nc "https://dl.google.com/dl/android/aosp/${factory_img}"

wget -nc "http://downloads.androidsu.com/superuser/${su_bin}"

tar -vxzf "${factory_img}"

cd ${factory_img%-factory*}

yes 'N' | unzip "image-${factory_img%-factory*}.zip"

mv -v "image-${factory_img%-factory*}.zip"{,.orig}

yes 'N' | unzip "../${su_bin}"

simg2img system.img{,.raw} || true

sudo mount -v -o loop system.img.raw /mnt

sudo cp -v system/bin/su /mnt/bin/

sudo chown -v 0:0 /mnt/bin/su

sudo chmod -v 6755 /mnt/bin/su

sync

sudo make_ext4fs -s -l 512M -a system system.img.new /mnt

sudo umount /mnt

sudo chown -v ${USER}:${GROUPS} system.img.new
mv -v system.img{.new,}

zip "image-${factory_img%-factory*}.zip" {boot,recovery,system,userdata}.img android-info.txt