h1. RestoreApplicationInternalData

{{toc}}

h2. /!\ Warning: Draft

This article is in draft form and is being written:
* Everybody is welcome to contribute
* Some things might not be accurate yet, so beware before using the information contained in it.

h2. Introduction

In some case, it is useful to be able to restore internal applications data:
* You may want to move the data of an application from a device to another
* If some files like /data/system/packages.xml or /data/system/appops.xml get corrupted, applications can loose access to their data. This can make the launcher and other applications crash.

h2. Howto

TODO:
* Explain how to mount a full backup, and why not to restore full backup completely
* Explain how and why create a tarball of the application data

<pre>
$ adb shell "mount /dev/block/platform/dw_mmc/by-name/USERDATA /data"
</pre>

<pre>
$ adb shell
</pre>

<pre>
root@m0:/ # cd /data/data/                                                     
root@m0:/data/data # 
</pre>

<pre>
root@m0:/data/data # ls -lad org.smssecure.smssecure
__bionic_open_tzdata: couldn't find any tzdata when looking for localtime!
__bionic_open_tzdata: couldn't find any tzdata when looking for GMT!
__bionic_open_tzdata: couldn't find any tzdata when looking for posixrules!
drwxr-x--x 2 u0_a61 u0_a61 4096 2012-01-01 00:01 org.smssecure.smssecure
</pre>

Here the users and groups are @u0_a61@.

<pre>
root@m0:/data/data # mv org.smssecure.smssecure org.smssecure.smssecure.delme
</pre>

<pre>
root@m0:/data/data # tar tf /org.smssecure.smssecure.tar
./org.smssecure.smssecure/
./org.smssecure.smssecure/lib -> /data/app/org.smssecure.smssecure-1/lib/arm
[...]
</pre>

<pre>
root@m0:/data/data # tar xpf /org.smssecure.smssecure.tar --numeric-owner
</pre>

<pre>
root@m0:/data/data # ls -ld org.smssecure.smssecure 
__bionic_open_tzdata: couldn't find any tzdata when looking for localtime!
__bionic_open_tzdata: couldn't find any tzdata when looking for GMT!
__bionic_open_tzdata: couldn't find any tzdata when looking for posixrules!
drwxr-x--x 9 u0_a63 u0_a63 4096 2012-01-01 00:21 org.smssecure.smssecure
</pre>

<pre>
root@m0:/data/data # chown u0_a61:u0_a61 -R org.smssecure.smssecure            
root@m0:/data/data # 
</pre>

<pre>
root@m0:/data/data # rm -rf org.smssecure.smssecure.delme
root@m0:/data/data # 
</pre>

<pre>
root@m0:/data/data # restorecon                                                
usage: restorecon [-D] [-F] [-R] [-n] [-v] FILE...

Restores the default security contexts for the given files.

-D	apply to /data/data too
-F	force reset
-R	recurse into directories
-n	don't make any changes; useful with -v to see what would change
-v	verbose: show any changes

restorecon: Needs 1 argument
</pre>

<pre>
root@m0:/data/data # restorecon -D -F -R -v /data/                           
SELinux: Loaded file_contexts contexts from /file_contexts.
[...]
SELinux:  Relabeling /data/data/org.smssecure.smssecure from u:object_r:system_data_file:s0 to u:object_r:app_data_file:s0:c512,c768.
SELinux:  Relabeling /data/data/org.smssecure.smssecure/lib from u:object_r:system_data_file:s0 to u:object_r:app_data_file:s0:c512,c768.
[...]
</pre>

<pre>
root@m0:/data/data # cd 
root@m0:/ # umount  /data/                                                     
root@m0:/ # 
</pre>

<pre>
root@m0:/ # sync
root@m0:/ # reboot
</pre>