WARNING: This page is still very much work in progress.

Upgrader

Introduction

The upgrader sits in its own partition and applies any update that the client passed it. Those are applied after being validated, any failure stops the upgrade process and attempts a reboot in standard mode.

Implementation

When rebooted into the upgrader partition, the phone will trigger the upgrader. The upgrader will check for any pending update, if found, it'll validate the signature and unpack them sequentially, then apply them to the device, when applied, the file is removed. On failure, the device is rebooted into normal mode with any failed/unapplied update kept on the file system.

When started without a list of update, a recovery menu will be shown to the user, allowing them to perform a factory reset or update from eMMC (from similar gpg signed update files).

Notes/TBD

Interfaces

Store command into /cache/recovery/command

• --update_package=path - OTA package file

• --wipe_data - erase user data and reboot

• System call: __system_property_set or shell out to adb reboot recovery