pyrox.dev
1import ./make-test-python.nix (
2 { lib, ... }:
3
4 {
5 name = "swapspace";
6
7 meta = with lib.maintainers; {
8 maintainers = [
9 Luflosi
10 phanirithvij
11 ];
12 };
13
14 nodes.machine = {
15 virtualisation.memorySize = 512;
16
17 services.swapspace = {
18 enable = true;
19 extraArgs = [ "-v" ];
20 settings = {
21 # test outside /var/lib/swapspace
22 swappath = "/swamp";
23 cooldown = 1;
24 };
25 };
26
27 swapDevices = lib.mkOverride 0 [
28 {
29 size = 127;
30 device = "/root/swapfile";
31 }
32 ];
33 boot.kernel.sysctl."vm.swappiness" = 60;
34 };
35
36 testScript = ''
37 machine.wait_for_unit("multi-user.target")
38 machine.wait_for_unit("swapspace.service")
39 machine.wait_for_unit("root-swapfile.swap")
40
41 # ensure swapspace wrapper command runs
42 machine.succeed("swapspace --inspect")
43
44 swamp = False
45 with subtest("swapspace works"):
46 machine.execute("mkdir /root/memfs")
47 machine.execute("mount -o size=2G -t tmpfs none /root/memfs")
48 i = 0
49 while i < 14:
50 print(machine.succeed("free -h"))
51 out = machine.succeed("sh -c 'swapon --show --noheadings --raw --bytes | grep /root/swapfile'")
52 row = out.split(' ')
53 # leave 1MB free to not get killed by oom
54 freebytes=int(row[2]) - int(row[3]) - 1*1024*1024
55 machine.succeed(f"dd if=/dev/random of=/root/memfs/{i} bs={freebytes} count=1")
56 machine.sleep(1)
57 out = machine.succeed("swapon --show")
58 print(out)
59 swamp = "/swamp" in out
60 if not swamp:
61 i += 1
62 else:
63 print("*"*10, "SWAPED", "*"*10)
64 machine.succeed("rm -f /root/memfs/*")
65 break
66
67 print(machine.succeed("swapspace -e -s /swamp"))
68 assert "/swamp" not in machine.execute("swapon --show")
69 assert swamp
70 '';
71 }
72)