RestoreApplicationInternalData¶

• Table of contents
• RestoreApplicationInternalData
  • /!\ Warning: Draft
  • Introduction
  • Howto

/!\ Warning: Draft¶

• Everybody is welcome to contribute
• Some things might not be accurate yet, so beware before using the information contained in it.

Introduction¶

• 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.

Howto¶

• 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

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

$ adb shell

root@m0:/ # cd /data/data/                                                     
root@m0:/data/data # 

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

Here the users and groups are u0_a61.

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

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
[...]

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

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

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

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

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

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.
[...]

root@m0:/data/data # cd 
root@m0:/ # umount  /data/                                                     
root@m0:/ # 

root@m0:/ # sync
root@m0:/ # reboot