allwinner_a64/android/vendor/google_vts/script

change_security_patch_ver.sh

The script can help you to generate a new GSI with different security patch level. The security patch level in GSI is placed in system/build.prop, ex:

ro.build.version.security_patch=2017-01-01

The script requires img2simg and simg2img, you could prepare them by following commands:

$ source build/envsetup.sh
$ lunch aosp_arm64-eng   # or any other workable project
$ make -j32 img2simg
$ make -j32 simg2img

You could use following command to check the security patch version in the image:

$ ./change_security_patch_ver.sh <gsi_system.img>

And use following command to change the security patch version in the image:

$ ./change_security_patch_ver.sh <gsi_system.img> <output_system.img> <new_version>

You need to input your password for mount image, example:

$./change_security_patch_ver.sh system.img out.img 2017-01-01
Unsparsing system.img...
Mounting...
[sudo] password for ********:
Replacing...
  Current version: 2017-09-05
  New version: 2017-01-01
Unmounting...
Writing out.img...
Done.

And check the result:

$ ./change_security_patch_ver.sh out.img
Unsparsing out.img...
Mounting...
  Current version: 2017-01-01
Unmounting...
Done.