fc0b16df8b
On some devices (e.g. ASUS Zenfone) the serial number of the device is stored in a file in the /factory partition. Consequently, the only way to load it is using a user space application during the init process, and to update the ro.serialno system property. In most places, TWRP already uses the system property to get the serial number of the device. However, when generating the device ID used for the backup folder name it checks the boot command line directly. On these devices, the serialno is not included on the command line. Add a TW_USE_SERIALNO_PROPERTY_FOR_DEVICE_ID option that enables usage of ro.serialno for generating the device id. It is disabled by default to avoid changing the device id on existing ports. Change-Id: I4a2eeca883f38fdaeb1209507fd8ebe44b1b04a0