nixos/earlyoom: bring the module up to date (#163663)

* nixos/earlyoom: bring the module up to date

Removes deprecated option `ignoreOOMScoreAdjust`, introduces `killHook`
as a replacement for `notificationsCommand`, and adds an `extraArgs`
option for things not covered by the module.

* nixos/earlyoom: add nixos test

* nixos/earlyoom: add reportInterval

Allows setting the interval for logging a memory report. Defaults to
3600 following upstream
     (https://github.com/rfjakob/earlyoom/blob/master/earlyoom.default#L5)
to avoid flooding logs.

* nixos/earlyoom: add free{Mem,Swap}KillThreshold

Fixes https://github.com/NixOS/nixpkgs/issues/83504

1 files changed, 16 insertions, 0 deletions

diff --git a/nixos/tests/earlyoom.nix b/nixos/tests/earlyoom.nix
new file mode 100644
index 0000000000000..75bdf56899b30
--- /dev/null
+++ b/nixos/tests/earlyoom.nix
@@ -0,0 +1,16 @@
+import ./make-test-python.nix ({ lib, ... }: {
+  name = "earlyoom";
+  meta = {
+    maintainers = with lib.maintainers; [ ncfavier ];
+  };
+
+  machine = {
+    services.earlyoom = {
+      enable = true;
+    };
+  };
+
+  testScript = ''
+    machine.wait_for_unit("earlyoom.service")
+  '';
+})