Install Gentoo Desktop into BtrFS subvolumes

00-gentoo-btrfs-disk

#!/usr/bin/env bash

## PARTITION DISKS
##################
# zap-all and clear partition table
sgdisk -Z /dev/sda && sgdisk -o /dev/sda
# create bios_grub partition
sgdisk -n 1::+8M -t 1:ef02 /dev/sda
# create boot partition
sgdisk -n 2::+512M -t 2:8300 /dev/sda
# create root partition
sgdisk -n 3:: -t 3:8300 /dev/sda

## CREATE FILESYSTEMS
#####################
mkfs.vfat  /dev/sda1
mkfs.ext2  /dev/sda2
mkfs.btrfs -L btrfsroot /dev/sda3

## CREATE SUBVOLS
#################
mkdir /mnt/gentoo
mount /dev/sda3 /mnt/gentoo
cd /mnt/gentoo
btrfs subvol create root
btrfs subvol create home
btrfs subvol create var
btrfs subvol create snapshots
cd ..
umount gentoo

## MOUNT VOLUMES
################
mount -o defaults,noatime,compress=lzo,ssd,subvol=root /dev/sda3 /mnt/gentoo

## create dirs for mounts
cd /mnt/gentoo
mkdir home root var boot snapshots

## mount
mount -o defaults,noatime,compress=lzo,ssd,subvol=home /dev/sda3 /mnt/gentoo/home
mount -o defaults,noatime,compress=lzo,ssd,subvol=var /dev/sda3  /mnt/gentoo/var
mount -o defaults,noatime,compress=lzo,ssd,subvol=snapshots /dev/sda3  /mnt/gentoo/snapshots
mount -o defaults,noatime /dev/sda2 /mnt/gentoo/boot

# disable CoW for var
chattr -R +C /mnt/gentoo/var