# NixOS configuration

## How to install

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

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 /mnt/home/simon/nixos/machines/nunotaba/configuration.nix /mnt/etc/nixos/configuration.nix

Generate hardware configuration and link it to the installation system
(required because of absolute paths)

    sudo nixos-generate-config --root /mnt/
    sudo ln -s /mnt/etc/nixos/hardware-configuration.nix /etc/nixos/hardware-configuration.nix

Install NixOS and reboot (if you do not have another machine, omit
`--no-root-passwd`)

    sudo nixos-install --no-root-passwd
    sudo reboot

**Hint**: If you need to reboot to the installation system because something
didn’t work, first open the luks partition like in the setup script, run `sudo
vgchange -ay` to scan for LVM VGs and then mount the other filesystems like in
the script.

SSH into the machine (or login locally if you set a root password), fix the
`configuration.nix` symlink, set a user password and clone the dotfiles

    ssh root@machine
    rm /etc/nixos/configuration.nix
    ln -s /home/simon/nixos/machines/nunotaba/configuration.nix /etc/nixos/configuration.nix
    passwd simon
    ^D
    ssh simon@machine
    # press “q” to get rid of zsh-newuser-install
    git clone https://github.com/andsens/homeshick.git $HOME/.homesick/repos/homeshick
    source $HOME/.homesick/repos/homeshick/homeshick.sh
    homeshick clone https://git.sbruder.de/simon/dotfiles

## 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)