#!/bin/bash

# Set Kernel Version Variable
#KVER='6.6.15-hardened1'
#KVER='5.10.145-hardened1'

# Dependencies
xbps-install -Sy make gcc xz elfutils elfutils-devel flex ncurses-devel openssl openssl-devel argp-standalone gcc-ada mpc libmpc-devel gmp-devel perl

function set_kver() {
    echo "Enter the kernel version to use (e.g., '6.6.15-hardened1'):"
    while true; do
        read -e -i "${KVER:-}" -p "" KVER
        if [[ $(echo $KVER | grep -E '^[0-9]+\.[0-9]+\.[0-9]+(-hardened1)$') == '' ]]; then
            echo "Invalid format.";
        else
            break;
        fi
    done
}

# Invoke function to prompt end-user for desired version (must be an active release in the Anthraxx Linux-Hardened repository)
set_kver

# Staging w/ error handling
if [[ ! -f /usr/src/"$KVER".tar.gz ]]; then
	/usr/bin/curl --verbose --tlsv1.3 --proto =https -L -O --url "https://github.com/anthraxx/linux-hardened/archive/refs/tags/$KVER.tar.gz"
fi

if [[ ! -d /usr/src/linux-hardened-"$KVER" ]]; then
	tar -xf "$KVER".tar.gz -C /usr/src/
fi

cd /usr/src/linux-hardened-"$KVER"
wget https://0xacab.org/optout/plague-kernel/-/raw/main/5.10-hardened.config -O .config


# Address system and file timing for clock skew runtime compilation error
plague-time-sync
find . -type f | xargs -n 5 touch
make clean

# Compilation
make oldconfig
make menuconfig

echo "Compiling "$KVER""
make -j $(nproc --all)
make modules_install INSTALL_MOD_STRIP=1 install

# Ensure /boot is rw
mount -o remount,rw /boot
cp ./arch/x86_64/boot/bzImage /boot/vmlinuz-"$KVER"_1
dracut --kver "$KVER"_1 --force
grub-mkconfig -o /boot/grub/grub.cfg

# remove sysmap/signing keys
rm /lib/modules/"$KVER"_1/source/certs/signing_key*
rm /lib/modules/"$KVER"_1/source/System.map
rm /lib/modules/"$KVER"_1/source
rm /lib/modules/"$KVER"_1/build