[Q] To devs... How to extract System.img

[Nokia7Vista]

Hi guys..

Sorry If I'm posting this in the wrong section...

But can anyone guide me how to extract System.img from a Stock ROM as I'm planning to cook a custom ROM

If you would like to see some of my previous work for SGS1 look at my signature

 

[pkoper]

You can try unyaffs in a cygwin environment or wunyaffs which is for windows.
For some reason I get access violation errors with stock roms for the Tab.
With HTC roms it was possible to dump the system.img with magiciso. Again with Tab roms this no longer works.

 

[mabalito]

In CWM, after mounting /system:
make_ext4fs -l 568m -s /sdcard/system.img /system

This gives you a sparse system.img which you can turn into a Linux-mountable ext4 image with simg2img

 

[secretfile]

Sorry i writed on wrong thread

 

[jamezelle]

In Linux you can do

mkdir tmp
sudo mount -o loop -t ext4 system.img ./tmp && cp -r ./tmp/* ./system/
sudo umount ./tmp

Sent from my Samsung Galaxy Tab 10.1 using Tapatalk

 

[Nokia7Vista]

In Linux you can do

mkdir tmp
sudo mount -o loop -t ext4 system.img ./tmp && cp -r ./tmp/* ./system/
sudo umount ./tmp

Sent from my Samsung Galaxy Tab 10.1 using Tapatalk

I'm getting an error

sudo mount -o loop -t ext4 system.img ./tmp && cp -r ./tmp/* ./system
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

 

[mabalito]

I'm getting an error

sudo mount -o loop -t ext4 system.img ./tmp && cp -r ./tmp/* ./system
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

See the message I posted up above? You have to run the system.img through simg2img to make it mountable.

Sent from my Samsung Galaxy Tab 10.1

 

[Nokia7Vista]

See the message I posted up above? You have to run the system.img through simg2img to make it mountable.

Sent from my Samsung Galaxy Tab 10.1

oh ok,, Thanks

 

[mabalito]

oh ok,, Thanks

Hope this helps and welcome to the GT10.1 forum

Sent from my Samsung Galaxy Tab 10.1

 

[maniac3389]

You could always create a regular (non-sparse) image file using dd then mount it.

Command should be similar to ****, though I'm not sure if the busybox version of dd accepts bs=1M, it may require bs=1048576. (That's MB converted to B) And count is the number of MB you want the image to be.

dd if=/dev/zero of=squeeze.img bs=1M count=512

Then mount it like this:

mount -o loop,noatime -t ext4 /sdcard/debian/squeeze.img /data/local/debian/

*Pulled from a thread I wrote awhile back, you may be able to get away without using the "noatime" option.