tjh.dev
nixpkgs mirror (for testing)
github.com/NixOS/nixpkgs
nix
1{ ... }:
2{
3 name = "snapper";
4
5 nodes.machine =
6 { pkgs, lib, ... }:
7 {
8 boot.initrd.postDeviceCommands = ''
9 ${pkgs.btrfs-progs}/bin/mkfs.btrfs -f -L aux /dev/vdb
10 '';
11
12 virtualisation.emptyDiskImages = [ 4096 ];
13
14 virtualisation.fileSystems = {
15 "/home" = {
16 device = "/dev/disk/by-label/aux";
17 fsType = "btrfs";
18 };
19 };
20 services.snapper.configs.home.SUBVOLUME = "/home";
21 services.snapper.filters = "/nix";
22 };
23
24 testScript =
25 { nodes, ... }:
26 let
27 inherit (nodes.machine.services.snapper) snapshotRootOnBoot;
28 in
29 ''
30 machine.succeed("btrfs subvolume create /home/.snapshots")
31 machine.succeed("snapper -c home list")
32 machine.succeed("snapper -c home create --description empty")
33 machine.succeed("echo test > /home/file")
34 machine.succeed("snapper -c home create --description file")
35 machine.succeed("snapper -c home status 1..2")
36 machine.succeed("snapper -c home undochange 1..2")
37 machine.fail("ls /home/file")
38 machine.succeed("snapper -c home delete 2")
39 machine.succeed("systemctl --wait start snapper-timeline.service")
40 machine.succeed("systemctl --wait start snapper-cleanup.service")
41 machine.${if snapshotRootOnBoot then "succeed" else "fail"}("systemctl cat snapper-boot.service")
42 '';
43}