# Defining some helper variables (these will be used in later code
# blocks as well, so make sure to use the same terminal session or
# redefine them later)
DISK=/dev/disk/by-id/nvme-CT4000P3PSSD8_2325E6E63746
HOST=mini

# ensure 4k sector size
nvme format --lbaf=1 --force $DISK
nvme id-ns -H $DISK

sleep 5

# kill old data
sgdisk --zap-all $DISK
blkdiscard -v $DISK
wipefs -a $DISK
gdisk -l $DISK

# create partitions
parted $DISK -- mklabel gpt
sgdisk -n 1:0:+1024M -c 1:"EFI System Partition" -t 1:EF00 $DISK
sgdisk -n 2:0:0 -c 2:"Linux" -t 2:8e00 $DISK
parted $DISK -- set 1 boot on

sleep 5

# take a look
cat /proc/partitions

# boot partition
mkfs.fat -F 32 -n EFIBOOT $DISK-part1

# create the crypto containers
cryptsetup luksFormat --sector-size 4096 --batch-mode --verify-passphrase $DISK-part2

sleep 5

# open them, set right options persistently
cryptsetup luksOpen --allow-discards --perf-no_read_workqueue --perf-no_write_workqueue --persistent $DISK-part2 crypt-system

sleep 5
lsblk --fs

# create btrfs with fast & strong checksumming and fast mounting
mkfs.btrfs -f --csum xxhash --features block-group-tree /dev/mapper/crypt-system

sleep 5
btrfs filesystem show

# create all the volumes
mount /dev/mapper/crypt-system /mnt
btrfs subvolume create /mnt/data
btrfs subvolume create /mnt/nix

sleep 5
btrfs subvolume list /mnt

# umount again, we will only use explicit subvolumes
umount /mnt

# prepare install
mount -t tmpfs none /mnt

# Create directories to mount file systems on
mkdir -p /mnt/{data,nix,home,boot,root,etc/nixos}

# mount the ESP
mount $DISK-part1 /mnt/boot

# mount volumes
mount -o subvol=data,noatime,nodiratime /dev/mapper/crypt-system /mnt/data
mount -o subvol=nix,noatime,nodiratime /dev/mapper/crypt-system /mnt/nix

# bind mount persistent stuff to data
mkdir -p /mnt/{data/home,data/root,data/nixos/$HOST}
mount --bind /mnt/data/home /mnt/home
mount --bind /mnt/data/root /mnt/root
mount --bind /mnt/data/nixos/$HOST /mnt/etc/nixos

# take a look
mount

# configure
nixos-generate-config --root /mnt

# save /mnt/etc/nixos/hardware-configuration.nix /mnt/etc/nixos/configuration.nix

cp /mnt/etc/nixos/hardware-configuration.nix /tmp
cp /mnt/etc/nixos/configuration.nix /tmp

# copy data

rsync --checksum -vaR --delete /data /mnt

# install

nixos-install --no-root-passwd --root /mnt

# unmount all stuff

umount -Rl /mnt
cryptsetup luksClose crypt-system