Importing the Disko module #
Before installing NixOS, it is important that all drives are correctly formatted and mounted. This can be done declaratively by importing the Disko module flake.
Defining disk partitions #
Disk partitions can be defined using the disko.devices configuration option. An example of a BTRFS boot drive declaration including LUKS encryption and dedicated persistence sub-partition looks like:
{
inputs,
...
}:
{
flake.modules.nixos.xps15-disk =
{
config,
lib,
pkgs,
...
}:
{
disko.devices = {
disk = {
main = {
type = "disk";
device = "/dev/nvme0n1";
content = {
type = "gpt";
partitions = {
boot = {
size = "1M";
type = "EF02"; # for grub MBR
};
ESP = {
size = "512M";
type = "EF00";
content = {
type = "filesystem";
format = "vfat";
mountpoint = "/boot";
};
};
luks = {
size = "100%";
content = {
type = "luks";
name = "crypted";
content = {
type = "btrfs";
extraArgs = [ "-f" ];
subvolumes = {
"/root" = {
mountpoint = "/";
};
"/persist" = {
mountpoint = "/persist";
mountOptions = [ "subvol=persist" ];
};
"/nix" = {
mountpoint = "/nix";
mountOptions = [ "subvol=nix" ];
};
"/swap" = {
mountpoint = "/.swapvol";
swap.swapfile.size = "16384M";
};
};
};
};
};
};
};
};
};
};
};
}Partitioning disks #
Prior to installing NixOS, we can partition disks like:
sudo nix run --experimental-features "nix-command flakes" github:nix-community/disko/latest -- --mode destroy,format,mount --flake github:robbiejennings/nix-config#<system>