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# New partition tables on sda and sdb
sgdisk --clear --new 0:0:0 /dev/sda
sgdisk --clear --new 0:0:0 /dev/sdb

# Set up btrfs
mkfs.btrfs -m raid1 -d raid1 /dev/sda1 /dev/sdb1

# Create a subvolume called nixos
mount /dev/sda1 /mnt/
btrfs subvolume create /mnt/nixos
umount /mnt/

# Mount this subvolume and create volumes for some other directories
mount -t btrfs -o subvol=nixos /dev/sda1 /mnt
btrfs subvolume create /mnt/var
btrfs subvolume create /mnt/home
btrfs subvolume create /mnt/tmp
btrfs subvolume create /mnt/boot

# Set up your desired machine configuration
vim /mnt/etc/nixos/configuration.nix

# Initialize nixpkgs repo in /mnt/etc now

# Install!
NIX_PATH=nixpkgs=/mnt/etc/nixpkgs/ nixos-install

# Set devid to the device id of /dev/sda1 (find with: btrfs filesystem show /mnt)
devid=...

# Shrink the disk by 500MB, can be any number larger than how much we'll shrink
# the partition by later
mount /dev/sda1 /mnt
btrfs filesystem resize $devid:-500m /mnt
umount /dev/sda1

# Delete the partition and make it again, 400MB smaller
sgdisk --delete 1 /dev/sda
sgdisk --new 0:0:-400M /dev/sda

# Create a boot partition
sgdisk --largest-new 0 /dev/sda
# This is the bootable attribute
sgdisk --attributes 2:set:2 /dev/sda

# Don't forget to resize the btrfs partition to fill the space
btrfs filesystem resize $devid:max /mnt

mount /dev/mmcblk0p1 /mnt
mv /mnt/extlinux/extlinux.conf /mnt/extlinux/not-extlinux.conf/
umount /mnt