#!/bin/ash # shellcheck shell=dash set -e # Declare used deviceinfo variables to pass shellcheck deviceinfo_append_dtb="" # shellcheck disable=SC1091 . /etc/deviceinfo # On A/B devices with bootloader cmdline ON this will return the slot suffix # if booting with an alternate method which erases the stock bootloader cmdline # this will be empty and the update will fail. # https://source.android.com/devices/bootloader/updating#slots # On non-A/B devices this will be empty ab_get_slot() { ab_slot_suffix=$(grep -o 'androidboot\.slot_suffix=..' /proc/cmdline | cut -d "=" -f2) || : echo "$ab_slot_suffix" } # $1: partition to flash from deviceinfo update_android_fastboot() { BOOT_PART_SUFFIX=$(ab_get_slot) # Empty for non-A/B devices BOOT_PARTITION=$(findfs PARTLABEL="$1${BOOT_PART_SUFFIX}") echo "Flashing boot.img to '$1${BOOT_PART_SUFFIX}'" dd if=/boot/boot.img of="$BOOT_PARTITION" bs=1M } update_android_split_kernel_initfs() { KERNEL_PARTITION=$(findfs PARTLABEL="${deviceinfo_flash_heimdall_partition_kernel:?}") INITFS_PARTITION=$(findfs PARTLABEL="${deviceinfo_flash_heimdall_partition_initfs:?}") KERNEL="vmlinuz" if [ "${deviceinfo_append_dtb}" = "true" ]; then KERNEL="$KERNEL-dtb" fi echo "Flashing kernel ($KERNEL)..." dd if=/boot/"$KERNEL" of="$KERNEL_PARTITION" bs=1M echo "Flashing initramfs..." gunzip -c /boot/initramfs | lzop | dd of="$INITFS_PARTITION" bs=1M } METHOD=${deviceinfo_flash_method:?} case $METHOD in fastboot) update_android_fastboot "${deviceinfo_flash_fastboot_partition_kernel:-boot}" ;; heimdall-bootimg) update_android_fastboot "${deviceinfo_flash_heimdall_partition_kernel:-KERNEL}" ;; heimdall-isorec) update_android_split_kernel_initfs ;; 0xffff) echo -n "No need to use this utility, since uboot loads the kernel directly from" echo " the boot partition. Your kernel should be updated already." exit 1 ;; *) echo "Devices with flash method: $METHOD are not supported." exit 1 ;; esac echo "Done."