#!/bin/bash
SWAP=/dev/sda2
SYS=/dev/sda1
CHROOT=/mnt/gentoo
STAGE3=stage3-amd64-20170907.tar.bz2
SNAPSHOT=portage-20171006.tar.bz2
REPO=https://repo.jmanson.fr

mkfs.ext4 $SYS
mkswap $SWAP
swapon $SWAP
mount $SYS $CHROOT
wget $REPO/$STAGE3
wget $REPO/$SNAPSHOT

tar xjpf $STAGE3 -C $CHROOT  --xattrs --numeric-owner
tar xjpf $SNAPSHOT -C $CHROOT/usr
chmod 1777 $CHROOT/tmp
mount -t proc /proc $CHROOT/proc
mount --rbind /sys $CHROOT/sys
mount --make-rslave $CHROOT/sys
mount --rbind /dev $CHROOT/dev
mount --make-rslave $CHROOT/dev
test -L /dev/shm && rm /dev/shm && mkdir /dev/shm
mount -t tmpfs -o nosuid,nodev,noexec shm /dev/shm
chmod 1777 /dev/shm
echo "Europe/Paris" > $CHROOT/etc/timezone
cp /etc/resolv.conf $CHROOT/etc/resolv.conf

mirrorselect -i -c FR -o >> $CHROOT/etc/portage/make.conf
NJOBS=$(grep '^processor' /proc/cpuinfo | sort -u | wc -l)
MAKEOPTS="-j$((NJOBS+1)) -l${NJOBS}"
echo MAKEOPTS='"'$MAKEOPTS'"' >> $CHROOT/etc/portage/make.conf
EMERGE_DEFAULT_OPTS="--jobs=${NJOBS} --load-average=${NJOBS}"
echo EMERGE_DEFAULT_OPTS='"'$EMERGE_DEFAULT_OPTS'"'  >> $CHROOT/etc/portage/make.conf
mkdir $CHROOT/etc/portage/repos.conf
cp $CHROOT/usr/share/portage/config/repos.conf $CHROOT/etc/portage/repos.conf/gentoo.conf
chroot $CHROOT /bin/bash -c "emerge --config sys-libs/timezone-data"
echo "fr_FR.UTF-8 UTF-8" >> $CHROOT/etc/locale.gen
chroot $CHROOT /bin/bash -c "locale-gen"
echo 'LANG="fr_FR.UTF-8"' > $CHROOT/etc/env.d/02locale
echo 'LC_COLLATE="C"' >> $CHROOT/etc/env.d/02locale
echo "app-admin/sudo -sendmail" >> $CHROOT/etc/portage/package.use/sudo.use
chroot $CHROOT /bin/bash -c "emerge sudo"
echo 'GRUB_PLATFORMS="pc"' >> $CHROOT/etc/portage/make.conf
echo "sys-boot/grub -fonts -themes" >> $CHROOT/etc/portage/package.use/grub.use
chroot $CHROOT /bin/bash -c "emerge genkernel"
chroot $CHROOT /bin/bash -c "emerge gentoo-sources"
chroot $CHROOT /bin/bash -c "emerge grub"
echo MAKEOPTS='"'-j${NJOBS}'"' >> $CHROOT/etc/genkernel.conf
chroot $CHROOT /bin/bash -c "genkernel all"
chroot $CHROOT /bin/bash -c "grub-install /dev/sda"
chroot $CHROOT /bin/bash -c "grub-mkconfig -o /boot/grub/grub.cfg"
echo 'GRUB_CMDLINE_LINUX_DEFAULT="quiet"' >> $CHROOT/etc/default/grub
chroot $CHROOT /bin/bash -c "useradd -p \`openssl passwd -1 password\` -G wheel joe"
echo "%wheel ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/wheel 
sed -i 's/keymap="us"/keymap="fr"/g' $CHROOT/etc/conf.d/keymaps