#!/bin/sh

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

: "${DISK:=riscv-mmc.img}"
: "${DISKSIZE:=300M}"

readonly SCRIPT="${0##*/}"
readonly TMPDIR="$(mktemp -dt "${SCRIPT%.*}".XXXXXX)"
readonly APK_KEY="alpine-devel@lists.alpinelinux.org-60ac2099.rsa.pub"
readonly MIRROR="http://dl-cdn.alpinelinux.org/alpine"
readonly LOOPDEV="$(losetup --find)"
readonly BOOTDEV="$LOOPDEV"p1
readonly ROOTDEV="$LOOPDEV"p2

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

trap cleanup EXIT INT

kernel="linux-starfive-6.0.0-r0.apk"

if [ ! -f $kernel ]; then
  wget https://dev.alpinelinux.org/~mps/riscv64/"$kernel"
fi

#if [ ! -f "$DISK" ]; then
	echo "Creating qemu raw disk"
	qemu-img create -f raw "$DISK" "$DISKSIZE"
	chown "$USER":"$USER" "$DISK"
#else
#	echo "Disk already exists exiting."
#	exit 1
#fi

echo "Paritioning disk"
# fat32 64MB, ext4 rest of device
parted -s "$DISK" mktable gpt > /dev/null
parted -s "$DISK" -- mkpart primary fat32 1MiB 65MiB > /dev/null
parted -s "$DISK" -- mkpart primary ext4 65MiB 100% > /dev/null
parted -s "$DISK" -- set 1 esp on > /dev/null

echo "Creating dirs and mounting"
losetup -P "$LOOPDEV" "$DISK"
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

cat <<'EOF' > "$TMPDIR"/boot/uEnv.txt
fdt_high=0xffffffffffffffff
initrd_high=0xffffffffffffffff

scriptaddr=0x88100000
script_offset_f=0x1fff000
script_size_f=0x1000

kernel_addr_r=0x84000000
kernel_comp_addr_r=0x90000000
kernel_comp_size=0x10000000

fdt_addr_r=0x88000000
ramdisk_addr_r=0x88300000

mmcpart=2
fdtfile=starfive/jh7100-starfive-visionfive-v1.dtb
load_efi_dtb=load mmc 0:2 ${fdt_addr_r} /boot/dtbs-starfive/${fdtfile}

bootcmd=devnum=0; run load_efi_dtb; run mmc_boot
distro_bootcmd=run load_efi_dtb; run bootcmd_mmc0
EOF

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

echo "installing base packages"
apk --allow-untrusted --root "$TMPDIR" --arch riscv64 --initdb add \
	alpine-base alpine-baselayout alpine-conf kmod openrc \
  dbus util-linux blkid chrony \
	sysfsutils ssl_client ca-certificates-bundle alpine-keys \
	ethtool e2fsprogs e2fsprogs-extra eudev \
	iwd linux-firmware-brcm linux-firmware-cypress font-dejavu installkernel mkinitfs \
	agetty openresolv tar wget
apk --allow-untrusted --root "$TMPDIR" --arch riscv64 add $kernel
apk --allow-untrusted --root "$TMPDIR" --arch riscv64 --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/chronyd default/local; do
	ln -s /etc/init.d/"${rc##*/}" "$TMPDIR"/etc/runlevels/"$rc"
done

echo "preparing scripts for setup"

echo 'SUBSYSTEM=drm;.*   root:video 660 */usr/libexec/libudev-zero-helper' >>  $TMPDIR/etc/mdev.conf
echo 'SUBSYSTEM=input;.* root:input 660 */usr/libexec/libudev-zero-helper' >>  $TMPDIR/etc/mdev.conf

cat > "$TMPDIR"/root/grub-setup.sh<<EOF
#!/bin/sh
grub-install --target=riscv64-efi --efi-directory=/boot/efi --removable
grub-mkfont -s 24 -o /boot/grub/fonts/dejavu.pf2 /usr/share/fonts/dejavu/DejaVuSansMono.ttf
grub-mkconfig  > /boot/grub/grub.cfg
exit
EOF

echo 'GRUB_DISABLE_LINUX_PARTUUID=true' >> "$TMPDIR"/etc/default/grub
echo 'GRUB_DISABLE_LINUX_UUID=false' >> "$TMPDIR"/etc/default/grub
echo 'GRUB_CMDLINE_LINUX="rootwait console=tty0 console=ttyS0,115200 earlycon stmmaceth=chain_mode:1"' >> "$TMPDIR"/etc/default/grub
echo 'GRUB_TIMEOUT=5' >> "$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
chroot $TMPDIR /root/grub-setup.sh
umount $TMPDIR/dev
umount $TMPDIR/sys
umount $TMPDIR/proc

# temporary hack of the DTB because its name differs in u-boot and kernel
cp $TMPDIR/boot/dtbs-starfive/starfive/jh7100-starfive-visionfive-v1.dtb \
	$TMPDIR/boot/dtbs-starfive/starfive/jh7100-visionfive.dtb

sed -i 's/^tty1.*/tty1::respawn:\/sbin\/agetty -L 115200 tty1 linux --login-pause --autologin root --noclear/' $TMPDIR/etc/inittab
sed -i 's/^#ttyS0/ttyS0/' $TMPDIR/etc/inittab
sed -i 's/^ttyS0.*/ttyS0::respawn:\/sbin\/agetty -L 115200 ttyS0 linux --login-pause --autologin root --noclear/' $TMPDIR/etc/inittab

echo "Finished, cleaning up"