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#!/bin/bash
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RELEASE=${RELEASE:-'openrc'}
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MIRROR=${MIRROR:-'https://mirrors.tuna.tsinghua.edu.cn/gentoo'}
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PORTAGE=${PORTAGE:-'rsync://mirrors.tuna.tsinghua.edu.cn/gentoo-portage'}
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set -e
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read -r -p "Where do you want to install Gentoo (e.g. /dev/sda)? " drive
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parted -s "$drive" mklabel gpt mkpart primary fat32 1MiB 1025MiB set 1 esp on 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 "${parts[2]}" cryptlvm
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pvcreate -qq /dev/mapper/cryptlvm
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vgcreate -qq vg0 /dev/mapper/cryptlvm
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memory=$(free -b | awk '/^Mem:/{print $2}')
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lvcreate -qq -L "${memory}b" -n swap vg0
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lvcreate -qq -l 100%FREE -n root vg0
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mkswap -q /dev/mapper/vg0-swap
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swapon /dev/mapper/vg0-swap
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mkfs.ext4 -q /dev/mapper/vg0-root
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mount /dev/mapper/vg0-root /mnt/gentoo
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mount -m "${parts[1]}" /mnt/gentoo/boot
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url="$MIRROR/releases/amd64/autobuilds/current-stage3-amd64-$RELEASE"
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stage3=$(wget -qO- "$url/latest-stage3-amd64-$RELEASE.txt" | grep -oP "stage3-amd64-$RELEASE-.*\.tar\.xz")
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wget -q "$url/$stage3"
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wget -qO- "$url/$stage3.sha256" | grep "$stage3" | sha256sum -c --quiet
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tar xpf "$stage3" -C /mnt/gentoo --xattrs-include='*.*' --numeric-owner
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sed -i 's/^COMMON_FLAGS=.*/COMMON_FLAGS="-march=native -O3 -pipe"/' /mnt/gentoo/etc/portage/make.conf
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cat >> /mnt/gentoo/etc/portage/make.conf <<EOF
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MAKEOPTS="-j$(nproc)"
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GENTOO_MIRRORS="$MIRROR"
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USE="X dbus dist-kernel dracut grub lto lvm mount 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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printf "[gentoo]\nsync-uri = $PORTAGE\n" > /mnt/gentoo/etc/portage/repos.conf/gentoo.conf
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genfstab -U /mnt/gentoo >> /mnt/gentoo/etc/fstab
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cp -L /etc/resolv.conf /mnt/gentoo/etc/
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arch-chroot /mnt/gentoo bash -ce '
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read -r -p "Enter new UNIX username: " username
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useradd -m -G wheel,video -s /bin/bash "$username"
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passwd "$username"
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emerge-webrsync -q
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emerge -q1 cpuid2cpuflags
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echo "*/* $(cpuid2cpuflags)" > /etc/portage/package.use/00cpu-flags
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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 nvidia-drivers sudo networkmanager sysklogd chrony
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sed -i "s/^#\s*\(%wheel\s*ALL=(ALL.*)\s*ALL\)/\1/" /etc/sudoers
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rc-update -q add NetworkManager default
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rc-update -q add sysklogd default
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rc-update -q add chronyd default
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grub-install --efi-directory=/boot
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'
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reboot