grub-nomagic-scripts

grub-cfg.sh (1497B)

#!/bin/sh
# /boot/grub/grub.cfg config manager
# Copyright ⓒ 2024 Haelwenn (lanodan) Monnier <contact+grub-nomagic-scripts@hacktivis.me>
# SPDX-License-Identifier: MIT
die() {
	echo "$@"
	exit 1
}
load_cfg() {
	if [ -e "$1" ] ; then
		. "$1"
	else
		die "grub-bios-install: Error, couldn't load configuration, file not found: $1"
	fi
}
set -e
load_cfg ~/.config/grub-nomagic/env
cd /boot
test -z "${CMDLINE}" && die '$CMDLINE needs to be set to the kernel cmdline, for example the root variable for the kernel'
test -z "${MICROCODE}" && die '$MICROCODE needs to be set, for example: amc-uc.img'
test -z "${GRUB_ROOT}" && die '$GRUB_ROOT needs to be set to the boottime grub root relative to the boot disk, for example: /ROOT/gentoo/@/boot'
cp grub/grub.cfg.head grub/grub.cfg || die 'grub/grub.cfg.head is required for initial configuration (such as modules and variables)'
if test ! -f "/boot/${MICROCODE}"
then
	echo "/boot/${MICROCODE}: File not found (microcode)"
	exit 1
fi
: ${INITRD_EXT:=.img}
for kernel in $(ls -t vmlinuz*)
do
	version="${kernel#vmlinuz}"
	: ${INITRD:=initramfs${version}${INITRD_EXT}}
	if test -e "${INITRD}"
	then
		echo "${kernel} + ${MICROCODE} + ${INITRD}"
	else
		echo "${kernel} ignored"
		continue
	fi
	cat >>grub/grub.cfg <<EOF
menuentry 'Linux${version:- Default}' {
	linux ${grub_root}/${kernel} ${CMDLINE}
	initrd ${grub_root}/${MICROCODE} ${grub_root}/${INITRD}
}
EOF
done
test -f grub/grub.cfg.tail && cat grub/grub.cfg.tail >> grub/grub.cfg