Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Chinese Ca-Fi knockoff has been rooted! Torque works!

GreenPants · 08-04-2013, 08:38 PM

Yep, that's pretty much what I was going to say in a PM...

mkdir ~/system_img
sudo mount -t ext4 -o loop system.img system_img/
cd ~/system_img
<tweak the files as you see fit>
sudo umount ~/system_img
<copy/use modified system.img>

I prefer the use of sudo over su as it only raises you to root for the duration of the command, rather than for the duration of the shell.

You need to be root when you modify files (e.g. sudo cp ...), not just to have the right permissions, but also to make sure that the root user becomes the owner of the files. Not all files have this requirement, so there are some that you may need to chown. You also need to make sure that the attributes are set correctly for the type of file (chmod/chattr)

If you're only interested in examining the system.img file system, then you can use
ext2read on Windows.

If you want to modify the root file system (uramdisk.img), then I have found bootutil.exe to be an easy tool to use on Windows.

08-04-2013, 08:38 PM	#1037
GreenPants Senior Member Join Date: Jul 2013 Drives: Burnt Orange GT86 Location: Christchurch, New Zealand Posts: 114 Thanks: 12 Thanked 74 Times in 50 Posts Mentioned: 36 Post(s)	Yep, that's pretty much what I was going to say in a PM... mkdir ~/system_img sudo mount -t ext4 -o loop system.img system_img/ cd ~/system_img <tweak the files as you see fit> sudo umount ~/system_img <copy/use modified system.img> I prefer the use of sudo over su as it only raises you to root for the duration of the command, rather than for the duration of the shell. You need to be root when you modify files (e.g. sudo cp ...), not just to have the right permissions, but also to make sure that the root user becomes the owner of the files. Not all files have this requirement, so there are some that you may need to chown. You also need to make sure that the attributes are set correctly for the type of file (chmod/chattr) If you're only interested in examining the system.img file system, then you can use ext2read on Windows. If you want to modify the root file system (uramdisk.img), then I have found bootutil.exe to be an easy tool to use on Windows.