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Some of my .nix files

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# nixfiles

Some of my .nix files

## Installing: Flake Edition

The configurations have been adapted to use flakes now, so some of the call
flows have been abstracted and reversed to allow for the
stateless/reproduceability requirements of flakes.

In order to maintain some sensitive data outside the repo, the NixOS flake
is designed to be called into by another outer flake. For convenience, there
is a template for this flake in this repo:

```console
$ nix flake init -t $NIXFILES_PATH/templates#nixos-device
```

Flow overview:

- Hosts are defined in `hosts/*`
- The flake provides `mkSystemConfigurations with arguments
- An outer flake is generated from `templates/nixos-device` that calls `mkSystemConfigurations` with additional private details, such as filesystem layout, FDE settings, additional secrets.

I like to have a clone of this `nixfiles` repo in `~root/nixfiles` which pulls from userland, and `~root/nixos` which is an instantiation of the nixos-device template.

## Installing: Old Pre-flake Edition

### Disk Setup

Rough sketch of the expected disk layout with full-disk encryption.

Some changes to the sketch for a more realistic scenario:

- Swap partition should be at least as big as the machine's RAM to support hibernate-to-disk. Otherwise, it can be omitted altogether in place of a swapfile.
- Boot partition can be made bigger to support an embedded recovery image (4-6 GB).

**NOTE**: If trying in a VM, make sure to use a SCSI virtual disk (instead of HDA) and UEFI enabled.

```bash
# Setup partition layout
# Swap should be >RAM size if you're going to use hibernate
parted /dev/sda -- mklabel gpt
parted /dev/sda -- mkpart ESP fat32 1MB 512MB  # boot
parted /dev/sda -- set 1 boot on
parted /dev/sda -- mkpart primary 512MB -1GB  # root
parted /dev/sda -- mkpart primary linux-swap -1GB 100%  # swap

# Encrypt the partitions
# Swap partition is also encrypted, so our hibernate state is encrypted.
# We use luks1 (instead of luks2) because grub2 only supports luks1 for now.
# Follow: https://github.com/NixOS/nixpkgs/issues/65375 for LUKS2 on Grub
# To convert, see: https://cryptsetup-team.pages.debian.net/cryptsetup/encrypted-boot.html
cryptsetup luksFormat --type luks1 /dev/sda2  # Enter password
cryptsetup luksFormat --type luks1 /dev/sda3  # Enter the same password

# Good time to add a key file, if we want to do that:
#   dd if=/dev/urandom of=cryptroot.key bs=1 count=4096
#   chmod 0400 cryptroot.key
#   cryptsetup luksAddKey /dev/sda2 cryptroot.key
#   cryptsetup luksAddKey /dev/sda3 cryptroot.key

# Open the encrypted partitions
cryptsetup open /dev/sda2 cryptroot
cryptsetup open /dev/sda3 cryptswap

# Format the underlying partitions
mkfs.fat -F 32 -n EFI /dev/sda1  # Unencrypted EFI partition
mkswap /dev/mapper/cryptswap
mkfs.btrfs /dev/mapper/cryptroot
mount -o defaults,noatime,compress=lzo,autodefrag /dev/mapper/cryptroot /mnt

# Create volumes on the btrfs root
btrfs subvolume create /mnt/@rootnix
btrfs subvolume create /mnt/@home

# Remount with new volumes
umount /mnt
mount -o compress=lzo,subvol=@rootnix /dev/mapper/cryptroot /mnt
mkdir -p /mnt/boot /mnt/home
mount -o compress=lzo,subvol=@home /dev/mapper/cryptroot /mnt/home
mkdir /mnt/boot/efi
mount /dev/sda1 /mnt/boot/efi

# Enable swap if you're using nixos-generate-config to auto-detect mounts
swapon /dev/mapper/cryptswap
```

Resume an existing disk setup:

```bash
cryptsetup open /dev/sda2 cryptroot  # Enter password
cryptsetup open /dev/sda3 cryptswap  # Enter password

mount -o compress=lzo,subvol=@rootnix /dev/mapper/cryptroot /mnt
mount -o compress=lzo,subvol=@home /dev/mapper/cryptroot /mnt/home
mount /dev/sda1 /mnt/boot/efi
```

### NixOS Setup from another distro

If you're installing from inside another distro, you can use these instructions: https://nixos.org/nixos/manual/index.html#sec-installing-from-other-distro

In Arch, using the aur/nix package [does not work](https://github.com/shazow/nixfiles/issues/3).

If we need to add hardware-specific configuration imports, we'll need [nixos-hardware (setup instructions)](https://github.com/NixOS/nixos-hardware#setup). The nix environment activator only includes the nixpkgs channel in the NIX_PATH by default, so we'll need to add that too.

```bash
# Activate the nix environment
. $HOME/.nix-profile/etc/profile.d/nix.sh

# Add the nixos-hardware channel
nix-channel --add https://github.com/NixOS/nixos-hardware/archive/master.tar.gz nixos-hardware
nix-channel --update nixos-hardware

# Add the new channel to our NIX_PATH
export NIX_PATH=${NIX_PATH}:${NIX_PATH//nixpkgs/nixos-hardware}
```

Some other notes for installing from another distro (doesn't apply for a normal install):
- `${disk.efi}` should be mounted to `/mnt/boot/efi` (or whatever the root prefix is).

After that, off we go:

```bash
sudo groupadd -g 30000 nixbld
sudo useradd -u 30000 -g nixbld -G nixbld nixbld
sudo PATH="$PATH" NIX_PATH="$NIX_PATH" `which nixos-install` --root /mnt
```

### NixOS Setup from scratch (in a VM)

```bash
curl -Ls "https://github.com/shazow/nixfiles/archive/master.zip" -o nixfiles.zip
unzip nixfiles.zip

mkdir /mnt/etc
mv nixfiles-master /mnt/etc/nixos

cd /mnt/etc/nixos
echo \"$(mkpasswd -m sha-512)\" > .hashedPassword.nix
chmod 400 .hashedPassword.nix

cat > disk.nix << EOF
{
  cryptroot = "/dev/sda2";
  cryptswap = "/dev/sda3";
  efi = "/dev/sda1";
}
EOF

cp hosts/example.nix configuration.nix
echo "Edit configuration.nix ... Some of the paths are wrong here, need to fix."

nixos-install --root /mnt
```

## References

Big thanks to my friend group of NixOS pioneers who paved through the unknowns, and answered many questions along the way.

- [@arilotter](https://github.com/arilotter) and https://github.com/arilotter/dotfiles
- [@attente](https://github.com/attente) and https://github.com/attente/dotfiles
- Bonus shoutout to [@jpf](https://github.com/jpf) for checking out NixOS long before it was cool

### Full Disk Encryption (FDE)

- https://nixos.wiki/wiki/Full_Disk_Encryption
- https://gist.github.com/ladinu/bfebdd90a5afd45dec811296016b2a3f
- https://gist.github.com/martijnvermaat/76f2e24d0239470dd71050358b4d5134

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