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I'm trying to migrate application data between devices. The application was installed to the work profile using Shelter The steps I did were:

  1. On source phone, tar cvf appdata.tar.gz /data/user/10/com.appname
  2. Copy the tarball from the source phone to the target phone
  3. On the target phone, install the applications to the work profile. Note the username of the /data/user/10/com.appname on the target phone, which is of the form u10_aXXX
  4. On the target phone, chown -R u10_aXXX:u10_aXXX /data/user/10/com.appname

When I'm trying to use the app, it receives a lot of SELinux AVC denials and ends up crashing because it's unable to open /data/user/10/com.appname/databases/database.db:

10-18 16:23:28.485  4120  4120 W SharedPreferenc: type=1400 audit(0.0:889): avc: denied { search } for name="shared_prefs" dev="dm-0" ino=860652 scontext=u:r:untrusted_app:s0:c522,c768 tcontext=u:object_r:app_data_file:s0 tclass=dir permissive=0

What am I missing? Application works after setting SELinux to permissive.

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    Run restorecon -R /data/user/10/com.appname. Oct 18, 2022 at 15:06
  • worked for me, thanks!
    – marmistrz
    Oct 19, 2022 at 8:20

1 Answer 1

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On newer Android versions the process mentioned in the question and comment is not sufficient. In my experience on LineageOS 20 (that is Android 13), the following changes were needed:

  1. The cache and code_cache directories must be owned by uX_aYYY_cache
  2. restorecon requires the -D parameter to touch files in /data/data

So the full process would be as follows:

  1. Unpack the files to /data/somewhere/com.appname. somewhere depends on the system profile, the default is simply /data/data
  2. chown -R uX_aYYY:uX_aYYY com.appname
  3. chown -R uX_aYYY:uX_aYYY_cache com.appname/cache
  4. chown -R uX_aYYY:uX_aYYY_cache com.appname/code_cache
  5. restorecon -DR com.appname
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  • You missed uX_aYYY_cache in steps 2,3. Would it be enough to just delete the cache dirs?
    – marmistrz
    Nov 3, 2023 at 12:09
  • Thanks, I've corrected it now. I haven't tried deleting the directories, but my guess would be that something would break. They are created during app installation and survive the "remove app data" operation, so it would be reasonable to assume that they exist all the time and won't be created on-demand. Nov 4, 2023 at 21:14

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