gein/gein

#!/usr/bin/env sh

## Commands
Emerge="emerge -q"
Read="read -ep"

## Gein Defaults
Grub_Target="/dev/sda"
Hostname="gein"
Locale="en_US.UTF-8 UTF-8"
Swap_Size="4G"
Time_Zone="America/New_York"
Video_Cards="intel"

## Gentoo Defaults
#Base_Url="https://raw.githubusercontent.com/jcmdln/gein/master"
#Kernel_Config="$Base_Url/usr/src/linux/4.12-config"
#Make_Conf="$Base_Url/etc/portage/make.conf"
#Package_Env="$Base_Url/etc/portage/package.env"
#Package_Use="$Base_Url/etc/portage/package.use"
Stage3_Arch="amd64"
Stage3_Date="20171005"
Stage3_Url="http://distfiles.gentoo.org/releases"


Bootstrap() {
    ## Confirm the user has setup their disks
    echo "Please ensure that you have performed the following: " && \
    echo "  - Edited the environment variables at the top of this script."
    echo "  - Partitioned and mounted your disk(s)." && \
    $Read "Proceed with installation? [Y/N]: " Proceed && \
    if echo $Proceed | grep -iq "^n"; then exit; fi

    ## Set time via ntpd
    ntpd -q -g

    ## Download and extract stage3 tarball
    cd /mnt/gentoo && \
    wget ${Stage3_Url}/${Stage3_Arch}/autobuilds/${Stage3_Date}/stage3-${Stage3_Arch}-${Stage3_Date}.tar.bz2 && \
    tar xvjpf stage3-*.tar.bz2 --xattrs --numeric-owner

    ## Mount hardware devices
    mount -t proc /proc /mnt/gentoo/proc && \
    mount --rbind /sys  /mnt/gentoo/sys && \
    mount --make-rslave /mnt/gentoo/sys && \
    mount --rbind /dev  /mnt/gentoo/dev && \
    mount --make-rslave /mnt/gentoo/dev

    ## Setup '/swapfile'
    Swap_File="/mnt/gentoo/swapfile" && \
    if [ ! -e $Swap_File ]; then
        fallocate -l $Swap_Size $Swap_File && \
        mkswap $Swap_File && \
        chmod 0600 $Swap_File && \
        swapon $Swap_File
    fi

    ## Configure Portage
    if [ ! -z $Make_Conf ]; then
        wget $Make_Conf -O /mnt/gentoo/etc/portage/make.conf
    fi && \
    if [ ! -z $Package_Use ]; then
        rm -rf /mnt/gentoo/etc/portage/package.use && \
        wget $Package_Use -O /mnt/gentoo/etc/portage/package.use
    fi && \
    if [ ! -z $Package_Env ]; then
        wget $Package_Env -O /mnt/gentoo/etc/portage/package.env
    fi

    ## Setup Portage mirrors
    mkdir -vp /mnt/gentoo/etc/portage/repos.conf && \
    cp -v /mnt/gentoo/usr/share/portage/config/repos.conf \
      /mnt/gentoo/etc/portage/repos.conf/gentoo.conf && \
    cp -vL /etc/resolv.conf /mnt/gentoo/etc/

    ## Add 'gein-extras' script
    mkdir -vp /mnt/gentoo/usr/local/sbin && \
    wget $Base_URL/usr/local/sbin/gein-extras -O /usr/local/sbin/gein-extras

    ## Chroot into '/mnt/gentoo'
    cd /mnt/gentoo && \
    echo "chroot'ing into /mnt/gentoo..."
    chroot /mnt/gentoo /bin/bash
}


Minimal() {
    ## Adjust make.conf to store the specified video card and # of CPU cores
    sed -i "s/Video_Cards/${Video_Cards}/g;
            s/Make_Opts/-j$(grep -c ^processor /proc/cpuinfo)/g" /etc/portage/make.conf

    ## Reload profile and update PS1
    source /etc/profile && \
    export PS1="(chroot) $PS1"

    ## Sync Portage and select profile
    emerge-webrsync && \
    eselect profile list && \
    $Read "Which profile? [Default is 1]: " Target_Profile && \
    if [ -z $Target_Profile ]; then
        Target_Profile="1"
    fi
    eselect profile set $Target_Profile && \
    $Emerge --update --deep --newuse @world

    ## Set desired timezone
    echo "${Time_Zone}" > /etc/timezone && \
    emerge --config sys-libs/timezone-data

    ## Set desired locales
    echo "${Locale}" > /etc/locale.gen && \
    locale-gen && \
    locale -a && \
    eselect locale list && \
    $Read "Target locale: " Target_Locale && \
    eselect locale set ${Target_Locale}

    ## Update environment
    env-update && \
    source /etc/profile && \
    export PS1="(chroot) $PS1"

    ## Emerge/install Linux kernel and modules
    $Emerge sys-kernel/gentoo-sources \
            sys-kernel/linux-firmware \
            sys-apps/pciutils \
            sys-kernel/genkernel && \
    if grep -Rqi 'intel' /proc/cpuinfo; then
        $Emerge intel-microcode
    fi && \
    cd /usr/src/linux && \
    if [ -z $Kernel_Config ]; then
        make defconfig && \
        make menuconfig
    else
        wget $Kernel_config -O /usr/src/linux/.config
    fi && \
    make && \
    make modules_install && \
    make install && \
    genkernel --install initramfs

    ## Configure '/etc/fstab/'
    echo "/swapfile none swap sw 0 0" >> /etc/fstab && \
    nano /etc/fstab

    ## Install neworking packages &
    $Emerge --noreplace net-misc/netifrc && \
    $Emerge net-misc/dhcpcd

    ## Set desired hostname and update '/etc/hosts'
    echo hostname="${Hostname}" > /etc/conf.d/hostname

    ## Configure and install Grub
    $Emerge sys-boot/grub:2 && \
    grub-install $Grub_Target && \
    grub-mkconfig -o /boot/grub/grub.cfg

    ## Set root password
    passwd
}


Desktop() {
    ## Install Desktop drivers and packages
    $Emerge dev-util/cmake \
            x11-base/xorg-drivers \
            x11-misc/wmctrl \
            x11-misc/xdotool && \
    env-update && \
    source /etc/profile && \
    export PS1="(chroot) $PS1" && \
    $Emerge app-admin/sudo \
            app-editors/vim \
            app-misc/ranger \
            app-misc/tmux \
            app-shells/zsh \
            app-shells/zsh-completions \
            media-fonts/dejavu \
            media-gfx/feh \
            media-gfx/scrot \
            media-libs/alsa-lib \
            media-sound/alsa-utils \
            media-video/mpv \
            net-misc/youtube-dl \
            www-client/chromium \
            x11-apps/xrandr \
            x11-misc/dmenu \
            x11-misc/i3lock \
            x11-misc/i3status \
            x11-misc/xclip \
            x11-terms/rxvt-unicode \
            x11-wm/i3
}


Laptop() {
    $Emerge app-laptop/laptop-mode-tools \
            net-misc/connman \
            net-wireless/wpa_supplicant \
            x11-apps/xbacklight && \
    rc-update add laptop_mode default
}


Cleanup() {
    ## Install eclean
    $Emerge app-portage/gentoolkit \
            app-admin/eclean-kernel && \

    ## Update @world, remove unused packages, and clean
    $Emerge -uDN @world && \
    $Emerge --depclean && \
    $Emerge --update --changed-use --deep @world && \
    eclean packages && \
    eclean-dist --deep --fetch-restricted

    ## Remove junk created during installation
    rm -rf /stage3*.tar.bz2
}


### Execution ####################################

shopt -s nocasematch && \
case $1 in
    bootstrap | -b) Bootstrap;;
    minimal   | -m) Minimal && Cleanup;;
    desktop   | -d) Minimal && Desktop && Cleanup;;
    laptop    | -l) Minimal && Desktop && Laptop && Cleanup;;

    help | --help | -h)
        echo "Try reading the script along with the Gentoo documentation:"
        echo "https://www.gentoo.org/support/documentation/"
    ;;

    *) printf "gein - GEntoo INstaller\n\n"
       echo "  -h help       Suggests to read the script and Gentoo documentation"
       printf "\nRequired first step:\n"
       echo "  -b bootstrap  Bootstrap the stage3 tarball"
       printf "\nPost-bootstrap options:\n"
       echo "  -m minimal    Only install required gentoo packages"
       echo "  -d desktop    Install required and desktop packages"
       echo "  -l laptop     Install required, desktop, and laptop packages"
    ;;
esac && shopt -u nocasematch