gein/gein

#!/usr/bin/env sh

## Helpers #######################################

Logger() {
    #cat >> /gi_log
    printf "$Log\n"
    unset Log
}

Clean_Packages() {
    Log="Removing packages that are no longer needed..." && Logger

    emerge -uDN @world && \
    emerge -av --depclean && \
    emerge --update --changed-use --deep @world
}

Clean_Source() {
    Log="Removing temporary files..." && Logger

    rm -rf /usr/portage/packages/* \
       /usr/portage/distfiles/* \
       /var/tmp/portage/* \
       /stage3*.tar.bz2
}

Detect_Cores() {
    Log="Detecting total number of cores to compile with..." && Logger

    export CPU_CORES=$(grep -c ^processor /proc/cpuinfo)
}

Setup_Ssh() {
    Log="Setting up SSH..." && Logger

    rc-update add sshd default
}


## Boot ##########################################

Boot_Config() {
    Log="Editing system defaults..." && Logger

    nano /etc/rc.conf
    nano /etc/conf.d/keymaps
    nano /etc/conf.d/hwclock
}

Boot_Grub() {
    Log="Installing Grub..." && Logger

    read -ep "Where to install Grub: " Grub_Target && \
    emerge --ask --verbose sys-boot/grub:2 && \
    grub-install $Grub_Target && \
    grub-mkconfig -o /boot/grub/grub.cfg
}


## Disks #########################################

Disk_Fstab() {
    Log="Editing '/etc/fstab'..." && Logger

    echo "/swapfile none swap sw 0 0" >> /etc/fstab && \
        nano /etc/fstab
}

Disk_Setup() {
    Log="Please setup partitions and mount them before proceeding!" && Logger

    read -ep "Proceed with installation? [Y/N]: " Proceed && \
    if echo $Proceed | grep -iq "^n" ; then
        exit
    fi
}


## Environment ###################################

Env_Chroot() {
    Log="Chrooting into the environment..." && Logger

    cd /mnt/gentoo && \
    chroot /mnt/gentoo /bin/bash
}

Env_Reload() {
    Log="Reloading the environment..." && Logger

    source /etc/profile && \
    export PS1="(chroot) $PS1"
}

Env_Update() {
    Log="Updating the environment..." && Logger

    env-update && \
    Env_Reload
}


## Host ##########################################

HostsFile() {
    Log="Updating hosts file..." && Logger

    nano /etc/hosts
}

HostName() {
    Log="Setting hostname..." && Logger

    read -ep "Hostname: " Target_Hostname && \
    echo hostname="$Target_Hostname" > /etc/conf.d/hostname && \
    nano /etc/conf.d/hostname
}


## Kernel ########################################

Kernel_Install() {
    Log="Downloading, building, and installing kernel..." && Logger

    emerge --ask \
        sys-kernel/gentoo-sources \
        sys-kernel/linux-firmware \
        sys-apps/pciutils \
        sys-kernel/genkernel &&
    cd /usr/src/linux && \
    make -j${CPU_CORES} defconfig && \
    make -j${CPU_CORES} menuconfig && \
    make -j${CPU_CORES} && \
    make -j${CPU_CORES} modules_install && \
    make -j${CPU_CORES} install && \
    genkernel --install initramfs
}


## Locale ########################################

Locales() {
    Log="Setting desired locales..." && Logger

    nano /etc/locale.gen && \
    locale-gen && locale -a && \
    eselect locale list && \
    read -ep "Target locale: " Target_Locale && \
    eselect locale set ${Target_Locale}
}


## Networking ####################################

Network_Wired() {
    Log="Configuring wired networking..." && Logger

    USE="ipv6" emerge --ask --noreplace net-misc/netifrc && \
    emerge --ask net-misc/dhcpcd
}

Network_Wireless() {
    Log="Configuring wireless networking..." && Logger

    USE="dbus" emerge --ask net-wireless/wpa_supplicant && \
    USE="ethernet openvpn wifi" emerge --ask net-misc/connman
}


## Portage #######################################

Portage_MakeConf() {
    Log="Downloading portage 'make.conf'..." && Logger

    echo "Available GPU drivers: AMD, Intel, Nouveau, Virt (vbox & vmware)"
    read -ep "Which GPU's do you have?: " Target_GPU && \
    case $Target_GPU in
        amd|AMD)
            export Active_GPU="amdgpu radeonsi radeon" 
        ;;

        intel|intel)
            export Active_GPU="intel" 
        ;;

        nouveau|Nouveau)
            export Active_GPU="nouveau" 
        ;;

        virt|Virt)
            export Active_GPU="virtualbox vmware" 
        ;;

        *) 
            echo "You must select one of the available options!"
        ;;
    esac

    echo '# /etc/portage/make.conf

CHOST="x86_64-pc-linux-gnu"
PORTDIR="/usr/portage"
DISTDIR="${PORTDIR}/distfiles"
PKGDIR="${PORTDIR}/packages"

MAKEOPTS="-j${CPU_CORES}"
EMERGE_DEFAULT_OPTS="--jobs=2"
CFLAGS="-march=native -O3 -pipe"
CXXFLAGS="${CFLAGS}"
CPU_FLAGS_X86="mmx mmxext sse sse2 sse3"
INPUT_DEVICES="libinput"

VIDEO_CARDS="$Active_GPU"

USE_Allow="bindist deblob minimal"
USE_Block="-avahi -doc -llvm -multilib -systemd"
USE="${USE_Block} ${USE_Allow}"' \
    > /mnt/gentoo/etc/portage/make.conf
}

Portage_Mirrors() {
    Log="Setting up portage mirrors..." && Logger

    mirrorselect -i -o >> /mnt/gentoo/etc/portage/make.conf && \
    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/
}

Portage_Sync() {
    Log="Syncing emerge and setting profile..." && Logger

    emerge-webrsync && \
    eselect profile list && \
    read -ep "Which profile?: " Target_Profile && \
    eselect profile set $Target_Profile && \
    emerge --ask --update --deep --newuse @world
}


## Stage #########################################

Stage_Download() {
    Log="Downloading and extracting Stage3 release..." && Logger

    S3_ARCH="amd64"
    S3_DATE="20170727"

    cd /mnt/gentoo
    wget http://distfiles.gentoo.org/releases/${S3_ARCH}/autobuilds/${S3_DATE}/stage3-${S3_ARCH}-nomultilib-${S3_DATE}.tar.bz2 && \
        tar xvjpf stage3-*.tar.bz2 --xattrs --numeric-owner
}

Stage_Mounts() {
    Log="Mounting hardware..." && Logger

    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
}

Stage_Swap() {
    Log="Setting up temporary swapfile..." && Logger

    SwapFile="/mnt/gentoo/swapfile"
    fallocate -l 4096M $SwapFile && \
    mkswap $SwapFile && \
    chmod 0600 $SwapFile && \
    swapon $SwapFile
}


## Time ##########################################

Time_Date() {
    Log="Setting current time via 'date'..." && Logger

    Ye=""; Mo=""; Da=""; Ho=""; Mi=""; Se=""
    date ${Ye}${Mo}${Da}${Ho}${Mi}${Se}
}

Time_Ntpd() {
    Log="Setting current time via 'ntpd'..." && Logger

    ntpd -q -g
}

Time_Zone() {
    Log="Setting timezone..." && Logger

    ls /usr/share/zoneinfo && \
    read -ep "Target region: " Target_Region && \
    ls /usr/share/zoneinfo/${Target_Region} && \
    read -ep "Target city: " Target_City && \
    TimeZone=${Target_Region}"/"${Target_City} && \
    echo "${TimeZone}" > /etc/timezone && \
    emerge --config sys-libs/timezone-data
}


## User ##########################################

User_Make() {
    Log="Creating user account..." && Logger

    read -ep "Setup a standard user? [Y/N]: " Proceed
    if echo $Proceed | grep -iq "^y"; then
        read -ep "Username: " Target_User && \
        useradd -m -G wheel $Target_User && \
        passwd $Target_User
    fi
}

User_Root() {
    Log="Setting root password..." && Logger

    passwd
}


## Utilities #####################################

Utils_Base() {
    Log="Adding Base utilities..." && Logger

    emerge --ask sudo

    if grep -Rqi 'intel' /proc/cpuinfo; then
        emerge --ask intel-microcode
    fi
}

Utils_Desktop() {
    Log="Installing desktop utilities..." && Logger

    USE="-minimal" emerge --ask --verbose x11-base/xorg-drivers && \
    emerge --ask x11-misc/xdotool x11-misc/wmctrl && \
    Env_Update && \
    USE="opengl vdpau" emerge --ask media-video/mpv && \
    USE="X" emerge --ask app-editors/vim && \
    MAKEOPTS="-j1" emerge --ask dev-util/cmake && \
    USE="-bindist" emerge --ask net-misc/openssh && \
    USE="minizip" emerge --ask sys-libs/zlib && \
    USE="text" emerge --ask app-text/xmlto && \
    USE="X xcb" emerge --ask x11-libs/cairo && \
    USE="icu" emerge --ask media-libs/harfbuzz && \
    USE="X" emerge --ask media-libs/imlib2 && \
    USE="xkb" emerge --ask x11-libs/libxcb && \
    USE="X" emerge --ask x11-libs/libxkbcommon && \
    USE="X" emerge --ask x11-libs/pango && \
    emerge --ask \
      media-fonts/dejavu \
      media-gfx/scrot \
      media-sound/cmus \
      media-video/ffmpeg \
      net-misc/youtube-dl \
      media-sound/alsa-utils \
      app-misc/ranger \
      app-misc/tmux \
      dev-vcs/git \
      net-misc/curl \
      www-client/elinks \
      x11-terms/rxvt-unicode \
      x11-wm/i3 \
      x11-misc/dmenu \
      x11-misc/i3lock \
      x11-misc/i3status && \
    USE="system-ffmpeg" L10N="en-us" emerge --ask www-client/chromium && \
    USE="ppapi" emerge --ask www-plugins/adobe-flash
}

Utils_Laptop() {
    Log="Installing laptop utilities..." && Logger

    USE="acpi bluetooth" emerge --ask app-laptop/laptop-mode-tools && \
    rc-update add laptop_mode default
}

Utils_Server() {
    Log="Installing server utilities..." && Logger

    # WIP
}


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

case $1 in
    init|-i)
        Disk_Setup
        Time_Ntpd
        Stage_Download
        Stage_Mounts
        Stage_Swap
        Portage_MakeConf
        Portage_Mirrors
        Env_Chroot
        ;;

    base|-b)
        Env_Reload
        Detect_Cores
        Portage_Sync
        Time_Zone
        Locales
        Env_Update
        Kernel_Install
        Disk_Fstab
        HostName
        Network_Wired
        HostsFile
        User_Root
        Boot_Config
        Boot_Grub
        Utils_Base
        User_Make
        ;;

    desktop|-d)
        Utils_Desktop
        ;;

    laptop|-l)
        Network_Wireless
        Utils_Laptop
        ;;

    server|-s)
        Utils_Server
        ;;

    clean|-c)
        Clean_Packages
        Clean_Source
        ;;

    *)
        Log="You entered an invalid option.\n"
        Log=${Log}"Available options: init (-i), base (-b), "
        Log=${Log}"desktop (-d), laptop(-l), server (-s), clean (-c)"
        Logger
        ;;
esac