install-script

#!/bin/bash

LRED='\033[01;31m'
GREEN='\033[0;32m'
LCYAN='\033[1;36m'
LBLUE='\033[1;34m'
LPURPLE='\033[0;35m'
DGRAY='\033[1;30m'
NC='\033[0m' # No Color

MOUNT_LOCATION=/mnt/gentoo
TIMEZONE=Asia/Dubai

CFLAGS="-march=haswell -O2 -pipe"
CPU_FLAGS="aes avx fma3 mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3"
USE_FLAGS="X acl bindist mmx sse sse2 -suid -kde -qt4 sna dri pulseaudio alsa dbus"
MAKE_OPTIONS="-j9"

BIOS_PARTITION=/dev/sda1
BOOT_PARTITION=/dev/sda2
SWAP_PARTITION=/dev/sda3
ROOT_PARTITION=/dev/sda4

ROOT_FS_TYPE=btrfs

STAGE3=stage3/stage3*
KERNEL_CONFIG_FILE=$(pwd)/kernel-configs/.config-gentoo #kernel config file is optimized for my particular system you will have to modify it for your system

HOSTNAME="gentoo"

PACKAGES="sys-fs/e2fsprogs sys-fs/dosfstools sys-fs/ntfs3g net-wireless/wpa_supplicant net-wireless/wireless-tools net-misc/dhcpcd app-text/tree sys-apps/pciutils"
TOOLS="app-admin/sysklogd sys-process/cronie sys-apps/mlocate"

message ()
{
  echo
  echo -e " $LBLUE>>> $LRED $@ $NC"
}

command ()
{
  echo -e "$LCYAN$@$NC"
  $@
  if [ $? -ne 0 ]; then
    echo -e "$LREDFailed$NC"
    exit 1
  fi
}

install_gentoo_prep ()
{
  #Disk Setup
  message "Beginning Installation Process"
  message "Formating Boot Partition"
  command mkfs.vfat $BOOT_PARTITION
  message "Formating Swap Partition"
  command mkswap -f $SWAP_PARTITION
  command swapon $SWAP_PARTITION
  message "Formating Root Partition"
  command mkfs.${ROOT_FS_TYPE} -f $ROOT_PARTITION

  #Mount Disks
  message "Mounting Root and Boot partitions"
  command mount -v $ROOT_PARTITION $MOUNT_LOCATION
  command mkdir -pv ${MOUNT_LOCATION}/boot
  command mount -v $BOOT_PARTITION ${MOUNT_LOCATION}/boot

  message "Make sure that date and time is set correctly, if it isn't then it can cause problems in the future"
  command date
  message "Is the following date correct (y/n)?"
  read DATE_CORRECT
  if [ $DATE_CORRECT = "n" ]; then
    message "Enter the date and time in MMDDhhmmYYYY format"
    read CORRECTED_DATE
    command date $CORRECTED_DATE
  fi

  #Stage3 Tarbal
  message "Copying stage3 tarball to system"
  command cp -rv $STAGE3 $MOUNT_LOCATION
  command cd $MOUNT_LOCATION

  message "Extracting stage3 tarball"
  command tar xvjpf stage3-*.tar.bz2 --xattrs

  message "Copying configuration files"
  command mkdir -pv ${MOUNT_LOCATION}/etc
  command mkdir -pv ${MOUNT_LOCATION}/etc/portage


  message "Copying kernel configuration files"
  command cp -rv $KERNEL_CONFIG_FILE ${MOUNT_LOCATION}/kernel-config

  ##Chroot
  message "Copying DNS info"
  command cp -L /etc/resolv.conf ${MOUNT_LOCATION}/etc/

  message "Mounting Necessary Filesystems"
  command mount -t proc proc /mnt/gentoo/proc
  command mount --rbind /sys /mnt/gentoo/sys
  command mount --make-rslave /mnt/gentoo/sys
  command mount --rbind /dev /mnt/gentoo/dev
  command mount --make-rslave /mnt/gentoo/dev

  message "Chrooting into System"
  command chroot $MOUNT_LOCATION /bin/bash -c "install_gentoo_chroot"
}

install_gentoo_chroot()
{
  message "Inside chroot env"
  command env-update
  command source /etc/profile
  command export PS1="(chroot) $PS1"

  #Portage
  message "Installing portage snapshot"
  command emerge-webrsync
  message "Updating portage tree"
  command emerge --sync

  message "Configuring /etc/portage/make.conf"
  cat << EOF > /etc/portage/make.conf
CFLAGS="${CFLAGS}"
CXXFLAGS="\${CFLAGS}"
CPU_FLAGS="$CPU_FLAGS"

# WARNING: Changing your CHOST is not something that should be done lightly.
# Please consult http://www.gentoo.org/doc/en/change-chost.xml before changing.
CHOST="x86_64-pc-linux-gnu"
# These are the USE flags that were used in addition to what is provided by the
# profile used for building.
USE="${USE_FLAGS}"
MAKEOPTS="-j9"
PORTDIR="/usr/portage"
DISTDIR="${PORTDIR}/distfiles"
PKGDIR="${PORTDIR}/packages"
EOF

  #Installation
  message "Setting Profile to default/linux/amd64/13.0/desktop "
  command eselect profile set default/linux/amd64/13.0/desktop

  message "Updating @world set"
  command emerge --ask --update --deep --newuse @world

  message "Installing filesystem packages"
  command emerge --ask $PACKAGES

  message "Configuring timezone"
  command echo "$TIMEZONE" > /etc/timezone
  command emerge --quiet --config sys-libs/timezone-data

  message "Writing /etc/locale.gen file"
  cat << EOF > /etc/locale.gen
# All blank lines and lines starting with # are ignored.
#en_US ISO-8859-1
 en_US.UTF-8 UTF-8
#ja_JP.EUC-JP EUC-JP
ja_JP.UTF-8 UTF-8
#ja_JP EUC-JP
#en_HK ISO-8859-1
#en_PH ISO-8859-1
#de_DE ISO-8859-1
#de_DE@euro ISO-8859-15
#es_MX ISO-8859-1
#fa_IR UTF-8
#fr_FR ISO-8859-1
#fr_FR@euro ISO-8859-15
#it_IT ISO-8859-1
EOF


  command locale-gen
  command eselect locale set en_US.utf8

  message "Reloading Environment"
  command env-update && source /etc/profile && export PS1="(chroot) $PS1"

  message "Downloading Kernel Sources"
  command emerge --ask sys-kernel/gentoo-sources

  message "Cleaning Kernel source folder"
  command cd /usr/src/linux/
  command make clean
  command make mrproper
  
  message "Loading kernel configuration file"
  command mv -v /kernel-config /usr/src/linux/.config-gentoo-final
  command cp -rv /usr/src/linux/.config-gentoo-final /usr/src/linux/.config

  message "Beginning Kernel Compilation Process"
  command make $MAKE_OPTIONS
  command make modules_install
  command make install

  message "Removing old kernel files"
  command rm -rf /boot/*old
  
  message "Creating bootx64.efi, (Meant for UEFI systems)"
  command mkdir -pv /boot/efi/boot
  command cp /boot/vmlinuz-* /boot/efi/boot/bootx64.efi

  message "Installing genkernel"
  command emerge --ask sys-kernel/genkernel

  message "Generating initramfs"
  command genkernel --${ROOT_FS_TYPE} --kerneldir=/usr/src/linux --kernel-config="/usr/src/linux/.config-gentoo-final" --install --no-ramdisk-modules initramfs

  cat << EOF > /etc/fstab
# /etc/fstab: static file system information.
#
# noatime turns off atimes for increased performance (atimes normally aren't
# needed); notail increases performance of ReiserFS (at the expense of storage
# efficiency).  It's safe to drop the noatime options if you want and to
# switch between notail / tail freely.
#
# The root filesystem should have a pass number of either 0 or 1.
# All other filesystems should have a pass number of 0 or greater than 1.
#
# See the manpage fstab(5) for more information.
#

# <fs>                  <mountpoint>    <type>          <opts>          <dump/pass>

# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
${BOOT_PARTITION}               /boot           vfat            noauto,noatime  1 2
${SWAP_PARTITION}               none            swap            sw              0 0
${ROOT_PARTITION}               /               btrfs           noatime,ssd,compress=lzo,clear_cache            0 0
EOF

  message "Setting Hostname"
  command sed -i "s/localhost/$HOSTNAME/g" /etc/conf.d/hostname
  message "Creating /etc/conf.d/net"
  command touch /etc/conf.d/net
  message "Installing netifrc"
  command emerge --ask --noreplace net-misc/netifrc
  message "Setting network interfaces to activate at boot"
  command cd /etc/init.d
  command ln -s net.lo net.eth0
  command rc-update add net.eth0 default

  message "Installing tools, cronie, and mlocate for file indexing"
  command emerge --ask $TOOLS

  message "Configuring Bootloader"
  echo GRUB_PLATFORMS="efi-64" >> /etc/portage/make.conf #For UEFI users only
  command emerge --ask sys-boot/grub:2
  message "Installing grub2"
  command grub2-install --target=x86_64-efi --efi-directory=/boot
  command grub2-mkconfig -o /boot/grub/grub.cfg

  message "Base installation has finished but there are still some steps that have to be done"
}

#exporting necessary functions and variables
export -f install_gentoo_chroot
export -f message
export -f command

export LRED
export GREEN
export LCYAN
export LBLUE
export LPURPLE
export DGRAY
export NC

export PACKAGES
export TIMEZONE
export CFLAGS
export CPU_FLAGS
export USE_FLAGS
export MAKE_OPTIONS
export BIOS_PARTITION
export BOOT_PARTITION
export SWAP_PARTITION
export ROOT_PARTITION
export ROOT_FS_TYPE
export MAKE_OPTIONS
export HOSTNAME
export TOOLS

./get-latest-stage3
install_gentoo_prep