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#!/bin/bash
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: ${MIRROR:='https://mirrors.tuna.tsinghua.edu.cn/gentoo'}
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: ${PORTAGE:='rsync://mirrors.tuna.tsinghua.edu.cn/gentoo-portage'}
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: ${TIMEZONE:='Asia/Shanghai'}
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: ${LANGUAGE:='zh_TW'}
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: ${LOCALHOST:='gentoo'}
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mem=$(free -g | awk '/^Mem:/{print $2}')
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: ${SWAP:=$(perl -e "use POSIX; print 2 ** ceil(log($mem) / log(4)), 'G'")}
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: ${JOBS:=$(( mem / 2 < $(nproc) ? mem / 2 : $(nproc) ))}
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set -e
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lsblk -p -o NAME,MODEL,SIZE,FSTYPE,PARTLABEL
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read -r -p 'Where do you want to install Gentoo (e.g. /dev/sda)? ' drive
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parted -s "$drive" mklabel gpt mkpart primary 1MiB 1025MiB set 1 esp on \
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	mkpart primary 1025MiB 100% set 2 lvm on
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mapfile -t parts < <(lsblk -np -x NAME -o NAME "$drive")
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cryptsetup -q luksFormat "${parts[2]}"
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cryptsetup open "${parts[2]}" cryptlvm
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pvcreate /dev/mapper/cryptlvm
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vgcreate vg0 /dev/mapper/cryptlvm
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lvcreate -L "$SWAP" -n swap vg0
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lvcreate -l 100%FREE -n root vg0
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mkswap /dev/mapper/vg0-swap
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swapon /dev/mapper/vg0-swap
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mkfs.ext4 /dev/mapper/vg0-root
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mount /dev/mapper/vg0-root /mnt/gentoo
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mkfs.fat -F 32 "${parts[1]}"
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mount -m "${parts[1]}" /mnt/gentoo/boot
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build='stage3-amd64-desktop-openrc'
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url="$MIRROR/releases/amd64/autobuilds/current-$build"
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file=$(wget -qO- "$url/latest-$build.txt" | grep -oP "$build-.*\.tar\.xz")
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wget "$url/$file"
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wget -qO- "$url/$file.sha256" | sha256sum -c
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tar xpf "$file" -C /mnt/gentoo --xattrs-include='*.*' --numeric-owner
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sed -i 's/^COMMON_FLAGS=.*/COMMON_FLAGS="-march=native -O3 -pipe"/' \
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	/mnt/gentoo/etc/portage/make.conf
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cat >> /mnt/gentoo/etc/portage/make.conf <<- EOF
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	MAKEOPTS="-j$JOBS"
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	GENTOO_MIRRORS="$MIRROR"
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	USE="dist-kernel lto pgo"
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	VIDEO_CARDS="nvidia"
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	ACCEPT_LICENSE="-* @FREE linux-fw-redistributable NVIDIA-r2"
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EOF
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mkdir -p /mnt/gentoo/etc/portage/repos.conf
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echo -e "[gentoo]\nsync-uri = $PORTAGE" \
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	> /mnt/gentoo/etc/portage/repos.conf/gentoo.conf
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echo 'sys-fs/lvm2 lvm' > /mnt/gentoo/etc/portage/package.use/lvm2
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echo 'sys-boot/grub mount' > /mnt/gentoo/etc/portage/package.use/grub
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echo 'sys-kernel/installkernel dracut grub' \
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	> /mnt/gentoo/etc/portage/package.use/installkernel
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echo 'x11-base/xorg-server -elogind suid xvfb' \
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	> /mnt/gentoo/etc/portage/package.use/xorg-server
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echo 'media-libs/libvpx postproc' > /mnt/gentoo/etc/portage/package.use/libvpx
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genfstab -U /mnt/gentoo >> /mnt/gentoo/etc/fstab
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cp -L /etc/resolv.conf /mnt/gentoo/etc/
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script=$(cat <<- EOF
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	read -r -p 'Enter new UNIX username: ' username
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	useradd -m -G wheel,video -s /bin/bash "\$username"
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	passwd "\$username"
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	ln -sf "/usr/share/zoneinfo/$TIMEZONE" /etc/localtime
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	echo "$LANGUAGE.UTF-8 UTF-8" >> /etc/locale.gen
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	locale-gen
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	eselect locale set "$LANGUAGE.utf8"
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	echo "$LOCALHOST" > /etc/hostname
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	emerge-webrsync
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	profile=\$(eselect profile list \\
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		| awk '/[0-9.]+\\/desktop\\/gnome\\s\\(stable\\)/{print \$1}' \\
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		| tr -d '[]')
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	eselect profile set "\$profile"
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	emerge -q1 cpuid2cpuflags
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	echo "*/* \$(cpuid2cpuflags)" > /etc/portage/package.use/00cpu-flags
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	emerge -quDN @world
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	emerge -qc
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	emerge -q cryptsetup os-prober
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	echo 'GRUB_DISABLE_OS_PROBER=false' >> /etc/default/grub
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	emerge -q linux-firmware sudo chrony gnome-light firefox noto-cjk \\
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		fnoto-emoji citx-chinese-addons fcitx-configtool
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	sed -i 's/^#\\s*\\(%wheel\\s*ALL=(ALL.*)\\s*ALL\\)/\\1/' /etc/sudoers
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	rc-update add NetworkManager default
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	echo -e '[main]\\nplugins=keyfile\\nhostname-mode=none' \\
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		> /etc/NetworkManager/NetworkManager.conf
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	rc-update add metalog default
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	rc-update add chronyd default
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	rc-update add elogind boot
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	sed -i 's/^DISPLAYMANAGER=.*/DISPLAYMANAGER="gdm"/' \\
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		/etc/conf.d/display-manager
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	rc-update add display-manager default
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	grub-install --efi-directory=/boot
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EOF
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)
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arch-chroot /mnt/gentoo bash -ce "$script"
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reboot