Rohit Sekhar authored Sep 19, 2022 and Nicolas Gelot committed Nov 16, 2022

* We need to depend on a prop that:
 a) Remains unlikely to change on stock ROM
 b) Won't be spoofed elsewhere

* This seems to be the most sane prop, satisfying these conditions

Rohit Sekhar authored Sep 19, 2022 and Nicolas Gelot committed Nov 16, 2022

* Devices that havent LOCKED would still be in fastboot

Rohit Sekhar authored Sep 19, 2022 and Nicolas Gelot committed Nov 16, 2022

* Do NOT LOCK bootloader incase the stored SPL was empty
* We have no idea what the actual rollback index might be, LOCKING might put
  the user in AVB red state and unbootable
* Just skip through the locking steps in this case

Rohit Sekhar authored Sep 19, 2022 and Nicolas Gelot committed Nov 16, 2022

* We don't want to have any cached values from previous runs

Rohit Sekhar authored Sep 19, 2022 and Nicolas Gelot committed Nov 16, 2022

* Unused after previous commit

Rohit Sekhar authored Sep 19, 2022 and Nicolas Gelot committed Nov 16, 2022

* Rollback Index == SPL only if we:
  - Are on the Stock ROM
    (Non Stock OS-es spoof SPL values)
  - Have a LOCKED bootloader
    (A device with an UNLOCKED bootloader MAY NOT have SPL == Rollback Index)

* On a given device from the wild, which can only be interfaced via ADB
  and Fastboot, this is the only way to understand the Rollback Index and
  prevent AVB Red state on LOCKING the bootloader

Close #444