export ROOTFS=btrfs
setup-sshd
setup-alpine
none 3 times at disk setup
apk add cfdisk btrfs-progs dosfstools
modprobe btrfs
cfdisk
(mdev-s)
mkfs.vfat -F 32 /dev/sda1
mkswap /dev/sda2
swapon /dev/sda2
mkfs.btrfs /dev/sda3
mount /dev/sda3 /mnt
btrfs subvolume create /mnt/@alpine
btrfs subvolume create /mnt/@home
umount /mnt
mount -t btrfs -o subvol=@alpine /dev/sda3 /mnt/
mkdir /mnt/home /mnt/boot
mount -t btrfs -o subvol=@home /dev/sda3 /mnt/home
mount -t vfat /dev/sda1 /mnt/boot
setup-disk -m sys /mnt