# build unstable installer

{
  description = "installation media";
  inputs.nixos.url = "nixpkgs/nixos-unstable";
  outputs = { self, nixos }: {
    nixosConfigurations = {
      exampleIso = nixos.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          "${nixos}/nixos/modules/installer/cd-dvd/installation-cd-minimal-new-kernel-no-zfs.nix"
        ];
      };
    };
  };
}

git init
git add flake.nix
nix --extra-experimental-features flakes --extra-experimental-features nix-command build .#nixosConfigurations.exampleIso.config.system.build.isoImage

sudo dd if=result/iso/nixos-24.05.20240108.317484b-x86_64-linux.iso of=/dev/sda bs=4M conv=fsync

#
# enable ssh for root
#

sudo bash
passwd

#
# kill old efi boot stuff
#

efibootmgr
efibootmgr -b 0 -B
efibootmgr -b 1 -B
efibootmgr -b 2 -B
efibootmgr -b 3 -B
efibootmgr -b 4 -B
efibootmgr

#
# install script below
#

# 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
btrfs subvolume create /mnt/root

sleep 5
btrfs subvolume list /mnt

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

# prepare install
mount -o subvol=root,noatime,nodiratime /dev/mapper/crypt-system /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

# create fake /data to have the right paths
mkdir -p /data
mount --bind /mnt/data /data

# 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 config data

sudo scp -r /data/nixos root@192.168.13.100:/mnt/data

# install

nixos-install --option experimental-features 'nix-command flakes' --no-root-passwd --root /mnt

# unmount all stuff

umount -Rl /data /mnt
cryptsetup luksClose crypt-system

# sync all /data after the install

sudo -E rsync -va --delete --one-file-system /data root@192.168.13.100:/

#
# after install tasks for extra file systems
#

# create vms disk

DD=/dev/disk/by-id/ata-CT2000MX500SSD1_2138E5D5061F
sgdisk --zap-all $DD
blkdiscard -v $DD
wipefs -a $DD

sleep 5

# create the crypto containers
cryptsetup luksFormat --batch-mode --verify-passphrase $DD

sleep 5

# open them, set right options persistently
cryptsetup luksOpen --allow-discards --perf-no_read_workqueue --perf-no_write_workqueue --persistent $DD crypt-vms

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-vms

sleep 5
btrfs filesystem show