Automated installer!

cdupdate.sh

echo 'read -s -n 1 -t 5 -p "Press any key to exit" && exit
/stage1.sh |& tee log
chroot /mnt/gentoo /stage2.sh |& tee -a log
mv log /mnt/gentoo
rm /mnt/gentoo/stage2.sh
init 0' >> etc/local.d/auto.start
chmod +x etc/local.d/auto.start
cp mnt/cdrom/stage*.sh .

isolinux.cfg

label linux
kernel gentoo
append root=/dev/ram0 loop=squashfs initrd=initrd cdroot quiet

stage1.sh

dd if=/dev/zero of=/dev/sda bs=512 count=1
echo -e "n\np\n\n\n+1G\nn\np\n\n\n\nt\n1\n82\nw\n" | fdisk /dev/sda
mkswap /dev/sda1
swapon /dev/sda1
mkfs.ext4 /dev/sda2
mount /dev/sda2 /mnt/gentoo
tar xf /mnt/cdrom/stage3.tbz2 -C /mnt/gentoo
tar xf /mnt/cdrom/portage.tar.xz -C /mnt/gentoo/usr
mount -B /dev /mnt/gentoo/dev
cp stage2.sh /mnt/gentoo/
ifconfig
dhcpcd
cp /etc/resolv.conf /mnt/gentoo/etc/

stage2.sh

env-update
source /etc/profile
mount -t proc proc /proc
mount -t devpts devpts /dev/pts
emerge -q --sync
eselect news read
echo 'ACCEPT_KEYWORDS="~amd64"
CFLAGS="-O2 -pipe -march=native"
CXXFLAGS="${CFLAGS}"
USE="symlink graphite lto -nls"'> /etc/make.conf
mkdir /etc/portage
echo '=sys-apps/portage-2* **' > /etc/portage/package.keywords
echo 'sys-boot/grub' > /etc/portage/package.unmask
emerge -quDN world grub vanilla-sources dhcpcd app-misc/screen nano
emerge -c
gcc-config 1
source /etc/profile
emerge @preserved-rebuild
perl-cleaner --all -- -q
python-updater -- -q
echo -5 | etc-update
mkdir /root/kernel
make -C /usr/src/linux O=/root/kernel defconfig
echo 'CONFIG_KERNEL_XZ=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_PCNET32=y
CONFIG_EXT4_FS=y
CONFIG_EXT3_FS=n
CONFIG_NETFILTER_XT_MARK=n
CONFIG_DEBUG_NX_TEST=n
CONFIG_AGP_INTEL=n' >>/root/kernel/.config
yes "" | make -C /root/kernel oldconfig
make -j5 -C /root/kernel
cp /root/kernel/arch/x86/boot/bzImage /boot/kernel
rm /etc/localtime
ln -s /usr/share/zoneinfo/US/Eastern /etc/localtime
sed -i -e "/BOOT\|fd0/d" -e "s/ROOT/sda2/" -e "s/SWAP/sda1/" \
-e "s/ext3/ext4/" /etc/fstab
sed -i "s/root:\*/root:/" /etc/shadow
sed -i "s/\#rc_sys/rc_sys/" /etc/rc.conf
grub2-install /dev/sda
echo 'set timeout=0
menuentry "Gentoo Linux" {
set root=(hd0,2)
linux /boot/kernel quiet
}' > /boot/grub2/grub.cfg
echo "passwd&&rm ~/.bash_profile" > /root/.bash_profile
cd /etc/init.d
ln -s net.lo net.eth0
rc-update add net.eth0 default

ln -s /usr/share/zoneinfo/$(tzselect) /etc/localtime