#!/bin/bash
# enter the void - developed by acidvegas (https://git.acid.vegas/void)

set -xev

# Configuration
ARCH=x86_64 # x86_64 or x86_64-musl
CPU=intel # amd or intel
DRIVE=/dev/sdb # can be a single drive or an array if using raidz with zfs
HOSTNAME=blackhole
SWAP_SIZE=4 # In GB (set to 0 to disable)
ROOT_FS=btrfs # btrfs or ext4
TIMEZONE=America/New_York
USERNAME=acidvegas
WIFI_SSID= # Leave blank if you don't want to use wifi
WIFI_PASS=
WIFI_DEV=wlan0

if [ -d /sys/firmware/efi ]; then
	BOOT_OPTION=UEFI
else
	BOOT_OPTION=BIOS
fi


check_config() {
	if [ ! $ARCH = "x86_64" ] && [ ! $ARCH = "x86_64-musl" ]; then
		printf "invalid ARCH\n" && exit 1
	elif [ ! $CPU = "amd" ] && [ ! $CPU = "intel" ]; then
		printf "invalid CPU\n" && exit 1
	elif [ ! -b $DRIVE ]; then
		printf "invalid DRIVE\n" && exit 1
	elif [ -z $HOSTNAME ]; then
		printf "invalid HOSTNAME\n" && exit 1
	elif ! [ "$SWAP_SIZE" -eq "$SWAP_SIZE" ] 2>/dev/null; then
		printf "invalid SWAP_SIZE\n" && exit 1
	elif [ ! $ROOT_FS = "btrfs" ] && [ ! $ROOT_FS = "ext4" ] && [ ! $ROOT_FS = "zfs" ]; then
		printf "invalid ROOT_FS\n" && exit 1
	elif [ ! -f /usr/share/zoneinfo/$TIMEZONE ]; then
		printf "invalid TIMEZONE\n" && exit 1
	elif [ -z $USERNAME ]; then
		printf "invalid USERNAME\n" && exit 1
	elif [ ! -z $WIFI_SSID ]; then
		if [ -z $(ip addr | grep '^[0-9]:' | awk '{print $2}' | tr -d ':' | grep $WIFI_DEV) ]; then
			printf "invalid WIFI_DEV\n" && exit 1
		fi
	fi
}


setup_network() {
	if [ ! -z "$WIFI_SSID" ]; then
		if rfkill list wifi | grep -q 'Soft blocked: yes\|Hard blocked: yes'; then
			printf "Wifi is blocked, attempting to unblock... (make sure to handle this after reboot)\n"
			rfkill unblock wifi
		fi
		wpa_passphrase "$WIFI_SSID" "$WIFI_PASS" | wpa_supplicant -i $WIFI_DEV -c /dev/stdin
	fi
}


setup_partition() {
	xbps-install -u xbps
	xbps-install -Su
	xbps-install parted

	wipefs -a $DRIVE
	if [ $BOOT_OPTION = "UEFI" ]; then
		parted $DRIVE --script mklabel gpt
		parted $DRIVE --script mkpart primary fat32 1MiB 513MiB
		parted $DRIVE --script set 1 esp on
		parted $DRIVE --script mkpart primary $ROOT_FS 513MiB 100%
		partprobe $DRIVE
		mkfs.vfat ${DRIVE}1
		if [ $ROOT_FS = "btrfs" ]; then
			mkfs.btrfs -f ${DRIVE}2
			mount ${DRIVE}2 /mnt
			btrfs subvolume create /mnt/@
			btrfs subvolume create /mnt/@home
			btrfs subvolume create /mnt/@snapshots
			umount /mnt
			mount -o subvol=@ ${DRIVE}2 /mnt
			mkdir -p /mnt/{home,snapshots}
			mount -o subvol=@home ${DRIVE}2 /mnt/home
			mount -o subvol=@snapshots ${DRIVE}2 /mnt/snapshots
		elif [ $ROOT_FS = "ext4" ]; then
			mkfs.ext4 ${DRIVE}2
			mount ${DRIVE}2 /mnt
		fi
		mkdir -p /mnt/boot/efi
		mount ${DRIVE}1 /mnt/boot/efi
	elif [ $BOOT_OPTION = "BIOS" ]; then
		parted $DRIVE --script mklabel msdos
		parted $DRIVE --script mkpart primary $ROOT_FS 1MiB 100%
		parted $DRIVE --script set 1 boot on
		partprobe $DRIVE
		if [ $ROOT_FS = "btrfs" ]; then
			mkfs.btrfs -f ${DRIVE}1
			mount ${DRIVE}1 /mnt
			btrfs subvolume create /mnt/@
			btrfs subvolume create /mnt/@home
			btrfs subvolume create /mnt/@snapshots
			umount /mnt
			mount -o subvol=@ ${DRIVE}1 /mnt
			mkdir -p /mnt/{home,snapshots}
			mount -o subvol=@home ${DRIVE}1 /mnt/home
			mount -o subvol=@snapshots ${DRIVE}1 /mnt/snapshots
		elif [ $ROOT_FS = "ext4" ]; then
			mkfs.ext4 ${DRIVE}1
			mount ${DRIVE}1 /mnt
		fi
	fi
}


setup_install() {
	REPO=https://repo-default.voidlinux.org/current
	if [ $ARCH = 'x86_64-musl' ]; then
		REPO=$REPO/musl
	fi

	mkdir -p /mnt/var/db/xbps/keys
	cp /var/db/xbps/keys/* /mnt/var/db/xbps/keys/

	XBPS_ARCH=$ARCH xbps-install -S -r /mnt -R "$REPO" base-system linux

	printf "entering chroot...remember to run setup_chroot() inside the chroot!\n"
	xchroot /mnt /bin/bash
}


setup_chroot() {
	passwd
	xbps-install -u xbps
	xbps-install -Su

	if [ $CPU = "intel" ]; then
		xbps-install void-repo-nonfree
		xbps-install -Su
		xbps-install intel-ucode
		ln -sf /etc/sv/intel-ucode /etc/runit/runsvdir/default/
	elif [ $CPU = "amd" ]; then
		xbps-install linux-firmware-amd
	fi

	useradd -m -s /bin/bash $USERNAME && passwd $USERNAME && gpasswd -a $USERNAME wheel
	ln -sf /usr/share/zoneinfo/$TIMEZONE /etc/localtime
	ln -sf /etc/sv/dhcpcd /etc/runit/runsvdir/default/
	hwclock --systohc
	printf "$HOSTNAME\n" > /etc/hostname
	printf "HOSTNAME=\"$HOSTNAME\"\nHARDWARECLOCK=\"UTC\"\nTIMEZONE=\"$TIMEZONE\"\nKEYMAP=us\n" > /etc/rc.conf

	if [ $ARCH = 'x86_64' ]; then
		printf "en_US.UTF-8 UTF-8\n" > /etc/default/libc-locales
		printf "LANG=en_US.UTF-8\n" > /etc/locale.conf
		xbps-reconfigure -f glibc-locales
	fi

	if [ $BOOT_OPTION = "UEFI" ]; then
		if [ $ROOT_FS = "btrfs" ]; then
			printf "UUID=$(blkid -s UUID -o value ${DRIVE}2) /          $ROOT_FS defaults,noatime,subvol=@  0 1\n"
			printf "UUID=$(blkid -s UUID -o value ${DRIVE}2) /home      $ROOT_FS defaults,subvol=@home      0 1\n"
			printf "UUID=$(blkid -s UUID -o value ${DRIVE}2) /snapshots $ROOT_FS defaults,subvol=@snapshots 0 1\n"
		elif [ $ROOT_FS = "ext4" ]; then
			printf "UUID=$(blkid -s UUID -o value ${DRIVE}2) / $ROOT_FS defaults,noatime 0 1\n"
		fi
		printf "UUID=$(blkid -s UUID -o value ${DRIVE}1) /boot/efi vfat defaults,noatime 0 1\n"
	elif [ $BOOT_OPTION = "BIOS" ]; then
		if [ $ROOT_FS = "btrfs" ]; then
			printf "UUID=$(blkid -s UUID -o value ${DRIVE}1) /          btrfs defaults,noatime,subvol=@  0 1\n"
			printf "UUID=$(blkid -s UUID -o value ${DRIVE}1) /home      btrfs defaults,subvol=@home      0 1\n"
			printf "UUID=$(blkid -s UUID -o value ${DRIVE}1) /snapshots btrfs defaults,subvol=@snapshots 0 1\n"
		elif [ $ROOT_FS = "ext4" ]; then
			printf "UUID=$(blkid -s UUID -o value ${DRIVE}1) / $ROOT_FS defaults,noatime  0 1\n"
		fi
	fi > /etc/fstab

	printf "tmpfs /tmp tmpfs defaults,nosuid,nodev 0 0\n" >> /etc/fstab

	if [ $SWAP_SIZE -gt 0 ]; then
		touch /swapfile
		if [ $ROOT_FS = "btrfs" ]; then
			chattr +C /swapfile
		fi
		dd if=/dev/zero of=/swapfile bs=1M count=${SWAP_SIZE}k status=progress
		chmod 0600 /swapfile
		mkswap /swapfile
		swapon /swapfile
		printf "/swapfile none swap sw 0 0\n" >> /etc/fstab
	fi

	if [ $BOOT_OPTION = "UEFI" ]; then
		xbps-install gummiboot
		gummiboot install
		nano /boot/loader/void-options.conf
		xbps-reconfigure -f linux$(unamer -r)
		# Optional, copy the EFI /boot/efi/EFI/boot/bootx64.efi to for tricking compatability
	elif [ $BOOT_OPTION = "BIOS" ]; then
		xbps-install grub
		grub-install /dev/$DRIVE
	fi

	xbps-reconfigure -fa
	exit
}



if [ "$#" -ne 1 ]; then
	printf "usage: $0 [install|partition|chroot|final]\n"
	exit 1
fi

check_config

case "$1" in
    network)   setup_network ;;
    partition) setup_partition ;;
    install)   setup_install ;;
    chroot)    setup_chroot ;;
    final)     umount -R /mnt; reboot ;;
    *)         printf "usage: $0 [install|partition|chroot|final]\n"; exit 1 ;;
esac