From 749aec844439cdc04602bbd1b4799c5c66554f32 Mon Sep 17 00:00:00 2001
From: Maximilian Bosch <maximilian@mbosch.me>
Date: Sun, 23 Jun 2024 11:46:58 +0200
Subject: [PATCH] nixos/nspawn: cgroupsv2 by default

That way you also get features like cgroup accounting for systemd units
when using systemd-nspawn w/o classic nixos containers.
---
 nixos/modules/system/boot/systemd/nspawn.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/nixos/modules/system/boot/systemd/nspawn.nix b/nixos/modules/system/boot/systemd/nspawn.nix
index 11fbb88838e1..e9bf82c462a9 100644
--- a/nixos/modules/system/boot/systemd/nspawn.nix
+++ b/nixos/modules/system/boot/systemd/nspawn.nix
@@ -127,6 +127,9 @@ in {
         })
         {
           systemd.targets.multi-user.wants = [ "machines.target" ];
+          systemd.services."systemd-nspawn@".environment = {
+            SYSTEMD_NSPAWN_UNIFIED_HIERARCHY = mkDefault "1";
+          };
         }
       ];
 }