pmaports/main/postmarketos-update-kernel/update-kernel.sh

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#!/bin/ash
# shellcheck shell=dash
set -e
# Declare used deviceinfo variables to pass shellcheck
deviceinfo_append_dtb=""
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# 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:?}
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case $METHOD in
fastboot)
update_android_fastboot "${flash_fastboot_partition_kernel:-boot}"
;;
heimdall-bootimg)
update_android_fastboot "${flash_heimdall_partition_kernel:-KERNEL}"
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;;
heimdall-isorec)
update_android_split_kernel_initfs
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;;
0xffff)
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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."