# NixOS configuration

## How to install

This guide describes how to install this configuration (or any NixOS
configuration) with GPT and legacy (BIOS) boot.

If you do not have a wired connection, first set up wifi

    wpa_passphrase "SSID" "PSK" | sudo wpa_supplicant -B -i wlp4s0 -c/dev/stdin

Create the partition table (enter the indented lines in the repl).

    sudo parted /dev/sdX
      mktable GPT
      mkpart primary 1MiB 2MiB
      mkpart primary 2MiB 500MiB
      mkpart primary 500MiB 100%
      set 1 bios_grub on
      disk_toggle pmbr_boot
      quit

Format encrypted partition and open it

    sudo cryptsetup luksFormat /dev/sdX3
    sudo cryptsetup luksOpen /dev/sdX3 HOSTNAME-pv

Create LVM (replace `8G` with desired swap size)

    sudo pvcreate /dev/mapper/HOSTNAME-pv
    sudo vgcreate HOSTNAME-vg /dev/mapper/HOSTNAME-pv
    sudo lvcreate -L 8G -n swap HOSTNAME-vg
    sudo lvcreate -l '100%FREE' -n root HOSTNAME-vg

**Hint**: If you have to reboot to the installation system later because
something went wrong and you need access to the LVM (but don’t know LVM), do
the following after opening the luks partition: `sudo vgchange -ay`

Create filesystems

    sudo mkfs.ext2 /dev/sdX2
    sudo mkfs.ext4 -L root /dev/HOSTNAME-vg/root
    sudo mkswap -L swap /dev/HOSTNAME-vg/swap

Mount the file systems and activate swap

    sudo mount /dev/HOSTNAME-vg/root /mnt
    sudo mkdir /mnt/boot
    sudo mount /dev/sdX2 /mnt/boot
    sudo swapon /dev/HOSTNAME-vg/swap

Create the configuration (see [below](#how-to-add-new-device)) and copy this
repository to your new home directory (e.g. `/mnt/home/simon/nixos`).

Add a symlink as the global configuration

    sudo mkdir -p /mnt/etc/nixos/
    sudo ln -s ../../home/simon/nixos/machines/nunotaba/configuration.nix /mnt/etc/nixos/configuration.nix

Generate hardware configuration and copy hardware configuration to machine
configuration

    sudo nixos-generate-config --root /mnt/
    sudo mv /mnt/etc/nixos/hardware-configuration.nix /mnt/home/simon/nixos/machines/nunotaba/hardware-configuration.nix
    sudo ln -s ../../home/simon/nixos/machines/nunotaba/hardware-configuration.nix /mnt/etc/nixos/hardware-configuration.nix

Install NixOS
    sudo nixos-install --no-root-passwd

Enter the target as a container and set a user password

    sudo cp /etc/resolv.conf /mnt/etc/ # see https://github.com/NixOS/nixpkgs/issues/39665
    nixos-enter
    passwd simon
    ^D # nixos-enter
    sudo rm /mnt/etc/resolv.conf
    reboot

## How to add new device

 * Copy the config from the device that is similar to the new one
 * Import profiles/modules you want
 * Change settings in `configuration.nix`
 * Change secrets

## License

[MIT License](LICENSE)