efistub setup

gistfile1.txt

#!/bin/sh

readonly bootdev=$1
readonly bootpar=${2:-"1"}

set -eo nounset pipefail

function error_exit() {
	echo "$@" >&2
	exit 1
}

if [ -z "$bootdev" ]; then
	error_exit "usage: $0 <bootdev> [bootpar]"
fi

if [ ! -b "$bootdev" ]; then
	error_exit "$bootdev is not a valid boot device"
fi

if ! expr "$bootpar" + 0 > /dev/null 2>&1; then
	error_exit "$bootpar is not a valid boot partition number"
fi

echo "Query offset of swapfile for resume from hibernation ..."
offset=$(btrfs inspect-internal map-swapfile -r /swap/swapfile) || exit $?
readonly offset

readonly resume="resume=LABEL=ROOT resume_offset=$offset"
readonly kargs="cryptdevice=LABEL=LUKS:root root=LABEL=ROOT rootflags=subvol=@root $resume rw quiet"

readonly cmd="efibootmgr --create \
	--disk $bootdev --part $bootpar \
	--label \"Arch Linux\" \
	--loader /vmlinuz-linux \
	--unicode \"initrd=\intel-ucode.img initrd=\initramfs-linux.img $kargs\""

echo "$cmd
Proceed with this command? [y|N]"
read confirm

case "$confirm" in
	"y"|"yes") ;;
	*) echo "Exiting..."; exit 0;
esac

echo "Proceeding with command ..."
eval $cmd