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#!/usr/bin/env bash
# Copyright (C) 2026-Ω Miquel Sabaté Solà <mikisabate@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set -ex
##
# Ensure you are root and dependencies are met.
if [ "$EUID" -ne 0 ];then
echo "kbuild (error): run this as root."
exit 1
fi
if [ ! -f /usr/bin/dracut ]; then
echo "kbuild (error): you need 'dracut'."
exit 1
fi
if [ ! -f /usr/sbin/btrfs ]; then
echo "kbuild (error): you need 'btrfs'."
exit 1
fi
if [ ! -f /usr/bin/sbsign ]; then
echo "kbuild (error): you need 'sbsign'."
exit 1
fi
if [ ! -f ../certs/dev_key.pem ]; then
echo "kbuild (error): you need your developer key to sign vmlinuz in '../certs/dev_key.pem'."
exit 1
fi
##
# Before anything at all, create a snapshot.
btrfs subvolume snapshot / /.snapshots/pre-kernel-$name
##
# The actual install.
make modules_install
# NOTE: headers are not installed on purpose.
# Manual make install: sign the compressed image and move files into /boot.
sbsign --key ../certs/dev_key.pem --cert ../certs/dev_key.pem arch/x86/boot/bzImage --output /boot/vmlinuz-$name
cp .config /boot/config-$name
cp System.map /boot/System.map-$name
# Generate initramfs.
dracut --kver=$name -f
##
# Update grub.
grub2-mkconfig -o /boot/grub2/grub.cfg
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