#!/usr/bin/env bash

# SPDX-License-Identifier: MIT

set -o errexit
set -o nounset
set -o pipefail
set -o xtrace

cd "$(dirname "$0")"

unset LC_CTYPE
unset LANG

export DEBOOTSTRAP=debootstrap

build_rootfs()
{
(
        sudo rm -rf testing
        mkdir -p cache
        sudo eatmydata ${DEBOOTSTRAP} --cache-dir=`pwd`/cache --arch=arm64 --include initramfs-tools,pciutils,wpasupplicant,tcpdump,vim,tmux,vlan,ntpdate,parted,curl,wget,grub-efi-arm64,mtr-tiny,dbus,ca-certificates,sudo,openssh-client,mtools,gdisk,cryptsetup,wireless-regdb,zstd stable testing http://deb.debian.org/debian

        cd testing

        sudo mkdir -p boot/efi/m1n1 etc/X11/xorg.conf.d

        sudo bash -c 'echo debian > etc/hostname'

        sudo bash -c 'echo > etc/motd'

        sudo cp ../../files/sources.list etc/apt/sources.list
        sudo cp ../../files/glanzmann.list etc/apt/sources.list.d/
        sudo cp ../../files/thomas-glanzmann.gpg etc/apt/trusted.gpg.d/
        sudo cp ../../files/hosts etc/hosts
        sudo cp ../../files/resolv.conf etc/resolv.conf
        sudo cp ../../files/quickstart.txt root/
        sudo cp ../../files/interfaces etc/network/interfaces
        sudo cp ../../files/wpa.conf etc/wpa_supplicant/wpa_supplicant.conf
        sudo cp ../../files/rc.local etc/rc.local
        sudo cp ../../files/30-modeset.conf etc/X11/xorg.conf.d/30-modeset.conf
        sudo cp ../../files/blacklist.conf etc/modprobe.d/

        sudo perl -p -i -e 's/"quiet"/"net.ifnames=0"/ if /^GRUB_CMDLINE_LINUX_DEFAULT=/' etc/default/grub

        sudo bash -c 'chroot . apt update'
        sudo bash -c 'chroot . apt install -y firmware-linux'

        sudo -- perl -p -i -e 's/root:x:/root::/' etc/passwd

        sudo -- ln -s lib/systemd/systemd init

        sudo chroot . apt update
        sudo chroot . apt install -y m1n1 linux-image-asahi
        sudo chroot . apt clean
        sudo rm var/lib/apt/lists/* || true
)
}

build_live_stick()
{
(
        rm -rf live-stick
        mkdir -p live-stick/efi/boot live-stick/efi/debian/
        sudo cp ../files/wifi.pl testing/etc/rc.local
        sudo bash -c 'cd testing; find . | cpio --quiet -H newc -o | zstd -T0 -16 > ../live-stick/initrd.zstd'
        cp testing/usr/lib/grub/arm64-efi/monolithic/grubaa64.efi live-stick/efi/boot/bootaa64.efi
        cp testing/boot/vmlinuz* live-stick/vmlinuz
        cp ../files/grub.cfg live-stick/efi/debian/grub.cfg
        (cd live-stick; tar cf ../asahi-debian-live.tar .)
)
}

build_dd()
{
(
        rm -f media
        dd if=/dev/zero of=media bs=1 count=0 seek=2G
        mkdir -p mnt
        mkfs.ext4 media
        tune2fs -O extents,uninit_bg,dir_index -m 0 -c 0 -i 0 media
        sudo mount -o loop media mnt
        sudo cp -a testing/* mnt/
        sudo rm -rf mnt/init mnt/boot/efi/m1n1
        sudo umount mnt
        tar cf - media | pigz -9 > m1.tgz
)
}

build_efi()
{
(
        rm -rf EFI
        mkdir -p EFI/boot EFI/debian
        cp testing/usr/lib/grub/arm64-efi/monolithic/grubaa64.efi EFI/boot/bootaa64.efi

        export INITRD=`ls -1 testing/boot/ | grep initrd`
        export VMLINUZ=`ls -1 testing/boot/ | grep vmlinuz`
        export UUID=`blkid -s UUID -o value media`
        cat > EFI/debian/grub.cfg <<EOF
search.fs_uuid ${UUID} root
linux (\$root)/boot/${VMLINUZ} root=UUID=${UUID} rw net.ifnames=0
initrd (\$root)/boot/${INITRD}
boot
EOF
)
}

build_asahi_installer_image()
{
(
        rm -rf aii
        mkdir -p aii/esp/m1n1
        cp -a EFI aii/esp/
        cp testing/usr/lib/m1n1/boot.bin aii/esp/m1n1/boot.bin
        ln media aii/media
        cd aii
        zip -r9 ../debian-base.zip esp media
)
}

publish_artefacts()
{
        echo upload build/asahi-debian-live.tar build/debian-base.zip
}

mkdir -p build
cd build

build_rootfs
build_dd
build_efi
build_asahi_installer_image
build_live_stick
publish_artefacts