HOWTO: Upgrade to Alpine 3.20

gistfile1.txt

#!/bin/ash

# There are some breaking changes to EFI upgrading from earlier versions of Alpine to 3.20
# The following should work based on the 3.20 changelog
# It should be run as root after upgrading to 3.20 BUT before rebooting. YMMV

# Links
# https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.20.0
# https://gitlab.alpinelinux.org/alpine/alpine-conf/-/blob/master/setup-disk.in#L320-324

# Set variables
ARCH=$(apk --print-arch)
efi_directory=$(awk '$2 ~ /boot/ && $3 ~ /fat|msdos/ { print $2 }' /proc/mounts)

case "$ARCH" in
	x86_64)		target=x86_64-efi ; fwa=x64 ;;
	x86)		target=i386-efi ; fwa=ia32 ;;
	arm*)		target=arm-efi ; fwa=arm ;;
	aarch64)	target=arm64-efi ; fwa=aa64 ;;
	riscv64)	target=riscv64-efi ; fwa=riscv64 ;;
	loongarch64)	target=loongarch64-efi ; fwa=loongarch64 ;;
esac

# Update EFI configs
grub-install --target=$target --efi-directory=$efi_directory --bootloader-id=alpine --boot-directory=/boot --no-nvram
install -D $efi_directory/EFI/alpine/grub$fwa.efi $efi_directory/EFI/boot/boot$fwa.efi

# reboot