pyrox.dev
1{ lib, ... }:
2{
3 name = "swap-file-btrfs";
4
5 meta.maintainers = with lib.maintainers; [ oxalica ];
6
7 nodes.machine =
8 { config, pkgs, ... }:
9 {
10 virtualisation.useDefaultFilesystems = false;
11
12 virtualisation.rootDevice = "/dev/vda";
13
14 boot.initrd.systemd.enable = true;
15 virtualisation.fileSystems = {
16 "/" = {
17 device = config.virtualisation.rootDevice;
18 fsType = "btrfs";
19 autoFormat = true;
20 };
21 };
22
23 swapDevices = [
24 {
25 device = "/var/swapfile";
26 size = 1; # 1MiB.
27 }
28 ];
29 };
30
31 testScript = ''
32 machine.wait_for_unit('var-swapfile.swap')
33 # Ensure the swap file creation script ran to completion without failing when creating the swap file
34 machine.fail("systemctl is-failed --quiet mkswap-var-swapfile.service")
35 machine.succeed("stat --file-system --format=%T /var/swapfile | grep btrfs")
36 # First run. Auto creation.
37 machine.succeed("swapon --show | grep /var/swapfile")
38
39 machine.shutdown()
40 machine.start()
41
42 # Second run. Use it as-is.
43 machine.wait_for_unit('var-swapfile.swap')
44 # Ensure the swap file creation script ran to completion without failing when the swap file already exists
45 machine.fail("systemctl is-failed --quiet mkswap-var-swapfile.service")
46 machine.succeed("swapon --show | grep /var/swapfile")
47 '';
48}