#!/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()
{
(
        handle_crosscompile
        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 testing testing http://deb.debian.org/debian

        cd testing

        sudo mkdir -p boot/efi

        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/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 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 cp ../${KERNEL} .
        sudo chroot . dpkg -i ${KERNEL}
        sudo rm ${KERNEL}

        sudo bash -c 'chroot . apt-get clean'
)
}

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 | pigz -9 > ../live-stick/initrd.gz'
        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_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=${UUID} rw
initrd (\$root)/boot/${INITRD}
boot
EOF
        tar czf efi.tgz EFI
)
}

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

publish_artefacts()
{
        sudo cp efi.tgz asahi-debian-live.tar debian-base.zip /u/
}

mkdir -p build
cd build

sudo apt-get install -y build-essential bash git locales gcc-aarch64-linux-gnu libc6-dev device-tree-compiler imagemagick ccache eatmydata debootstrap pigz libncurses-dev qemu-user-static binfmt-support rsync git flex bison bc kmod cpio libncurses5-dev libelf-dev:native libssl-dev dwarves

build_linux
build_m1n1
build_uboot
build_rootfs
build_efi
build_asahi_installer_image
build_live_stick
publish_artefacts