nixpkgs/nixos/tests/swap-file-btrfs.nix

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import ./make-test-python.nix ({ lib, ... }:
{
name = "swap-file-btrfs";
meta.maintainers = with lib.maintainers; [ oxalica ];
nodes.machine =
{ pkgs, ... }:
{
virtualisation.useDefaultFilesystems = false;
virtualisation.rootDevice = "/dev/vda";
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boot.initrd.postDeviceCommands = ''
${pkgs.btrfs-progs}/bin/mkfs.btrfs --label root /dev/vda
'';
virtualisation.fileSystems = {
"/" = {
device = "/dev/disk/by-label/root";
fsType = "btrfs";
};
};
swapDevices = [
{
device = "/var/swapfile";
size = 1; # 1MiB.
}
];
};
testScript = ''
machine.wait_for_unit('var-swapfile.swap')
# Ensure the swap file creation script ran to completion without failing when creating the swap file
machine.fail("systemctl is-failed --quiet mkswap-var-swapfile.service")
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machine.succeed("stat --file-system --format=%T /var/swapfile | grep btrfs")
# First run. Auto creation.
machine.succeed("swapon --show | grep /var/swapfile")
machine.shutdown()
machine.start()
# Second run. Use it as-is.
machine.wait_for_unit('var-swapfile.swap')
# Ensure the swap file creation script ran to completion without failing when the swap file already exists
machine.fail("systemctl is-failed --quiet mkswap-var-swapfile.service")
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machine.succeed("swapon --show | grep /var/swapfile")
'';
})