#!/bin/sh

# apk add blkid parted dosfstools e2fsprogs wget tar
set -eu

: "${DISK:=/dev/sdc}"

readonly SCRIPT="${0##*/}"
readonly TMPDIR="$(mktemp -dt "${SCRIPT%.*}".XXXXXX)"
readonly BOOTDEV="$DISK"1
readonly ROOTDEV="$DISK"2
readonly APK_KEY="alpine-devel@lists.alpinelinux.org-60ac2099.rsa.pub"
readonly MIRROR="http://dl-cdn.alpinelinux.org/alpine"

model='j293'
kernver='5.16.0-r15'
kernel="linux-asahi-$kernver.apk"

cleanup() {
	set +e
	mountpoint -q "$TMPDIR"/boot/efi && umount "$TMPDIR"/boot/efi
	mountpoint -q "$TMPDIR" && umount "$TMPDIR"
	rm -rf "$TMPDIR"
}

trap cleanup EXIT INT

if [ ! -f u-boot.macho ]; then
	#wget https://dev.alpinelinux.org/~mps/m1/m1n1.macho
	wget https://dev.alpinelinux.org/~mps/m1/u-boot.macho
fi

if [ ! -f $kernel ]; then
	wget https://dev.alpinelinux.org/~mps/m1/"$kernel"
fi

echo "Paritioning disk"
parted -s "$DISK" mktable gpt > /dev/null
parted -s "$DISK" unit s -- mkpart primary fat32 2048 1050623 > /dev/null
parted -s "$DISK" -- set 1 esp on > /dev/null
parted -s "$DISK" unit s -- mkpart primary ext4 1050624 7888862 > /dev/null

echo "Creating dirs and mounting"
mkfs.fat -F 32 -n ESP "$BOOTDEV"
mkfs.ext4 -qL root "$ROOTDEV"
mount -t ext4 "$ROOTDEV" "$TMPDIR"
mkdir -p "$TMPDIR"/boot
mkdir -p "$TMPDIR"/boot/efi "$TMPDIR"/etc/apk/keys
mount -t vfat "$BOOTDEV" "$TMPDIR"/boot/efi

echo "Setup apk keys and repositories"
wget -qP "$TMPDIR"/etc/apk/keys https://alpinelinux.org/keys/"$APK_KEY"
printf "$MIRROR/edge/%s\n" main community > "$TMPDIR"/etc/apk/repositories

echo "installing base packages"
apk --allow-untrusted --root "$TMPDIR" --arch aarch64 --initdb add \
	alpine-base alpine-baselayout alpine-conf kmod openrc \
  dbus util-linux blkid chrony \
	sysfsutils ssl_client ca-certificates-bundle alpine-keys \
	ethtool e2fsprogs libudev-zero libudev-zero-helper \
	iwd linux-firmware wpa_supplicant efibootmgr ttf-dejavu \
	nvme-cli agetty terminus-font openresolv

tar xf linux-5.16.0-asahi-25.tar.gz -C $TMPDIR
#apk --allow-untrusted --root "$TMPDIR" --arch aarch64 --no-script add $kernel
apk --allow-untrusted --root "$TMPDIR" --arch aarch64 --no-script add grub-efi grub-mkfont

echo "Setting up services and inittab"
for rc in boot/bootmisc boot/hostname boot/modules boot/sysctl boot/urandom boot/networking \
	sysinit/devfs sysinit/hwdrivers sysinit/mdev sysinit/modules \
	shutdown/mount-ro shutdown/killprocs \
	default/dbus default/iwd default/chronyd; do
	ln -s /etc/init.d/"${rc##*/}" "$TMPDIR"/etc/runlevels/"$rc"
done

cat > "$TMPDIR"/root/grub-setup.sh<<EOF
#!/bin/sh
grub-install --target=arm64-efi --efi-directory=/boot/efi --removable
grub-mkfont -s 24 -o /boot/grub/fonts/dejavu.pf2 /usr/share/fonts/ttf-dejavu/DejaVuSansMono.ttf
grub-mkconfig  > /boot/grub/grub.cfg
sed -i 's/^tty1.*/tty1::respawn:\/sbin\/agetty -L 115200 tty1 linux --login-pause --autologin root --noclear/' /etc/inittab
exit
EOF
echo 'GRUB_DISABLE_LINUX_PARTUUID=false' >> "$TMPDIR"/etc/default/grub
echo 'GRUB_CMDLINE_LINUX="rootwait console=tty1"' >> "$TMPDIR"/etc/default/grub
echo 'GRUB_TIMEOUT=10' >> "$TMPDIR"/etc/default/grub
echo 'GRUB_FONT="/boot/grub/fonts/dejavu.pf2"' >> "$TMPDIR"/etc/default/grub
chmod 0744 "$TMPDIR"/root/grub-setup.sh

echo "Settting grub boot loader"
mount -t proc none $TMPDIR/proc
mount -o bind /sys $TMPDIR/sys
mount -o bind /dev $TMPDIR/dev
echo "Run this two commands and after that exit"
echo "grub-install --target=arm64-efi --efi-directory=/boot/efi --removable"
echo "grub-mkconfig  > /boot/grub/grub.cfg"
chroot $TMPDIR /root/grub-setup.sh
#chroot $TMPDIR /bin/ash -l
umount $TMPDIR/dev
umount $TMPDIR/sys
umount $TMPDIR/proc


echo "Finished, cleaning up"