From 883092e3f78d4efb1066a2e24e343b307035a04c Mon Sep 17 00:00:00 2001
From: Cole Helbling <cole.e.helbling@outlook.com>
Date: Wed, 20 Sep 2023 09:09:01 -0700
Subject: [PATCH] Re-enable systemd-nspawn test

It was disabled in c6953d1ff62fb6dc4fbd89c03e7949c552c19382 because
a recent Nixpkgs bump brought in a new systemd which changed how
systemd-nspawn worked.

As far as I can tell, the issue was caused by this upstream systemd
commit:
https://github.com/systemd/systemd/commit/b71a0192c040f585397cfc6fc2ca025bf839733d

Bind-mounting the host's `/sys` and `/proc` into the container's
`/run/host/{sys,proc}` fixes the issue and allows the test to succeed.
---
 tests/nixos/containers/containers.nix     | 4 ++--
 tests/nixos/containers/systemd-nspawn.nix | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/nixos/containers/containers.nix b/tests/nixos/containers/containers.nix
index e721be48f..c8ee78a4a 100644
--- a/tests/nixos/containers/containers.nix
+++ b/tests/nixos/containers/containers.nix
@@ -56,8 +56,8 @@
     host.fail("nix build -v --auto-allocate-uids --no-sandbox -L --offline --impure --file ${./id-test.nix} --argstr name id-test-6 --arg uidRange true")
 
     # Run systemd-nspawn in a Nix build.
-    #host.succeed("nix build -v --auto-allocate-uids --sandbox -L --offline --impure --file ${./systemd-nspawn.nix} --argstr nixpkgs ${nixpkgs}")
-    #host.succeed("[[ $(cat ./result/msg) = 'Hello World' ]]")
+    host.succeed("nix build -v --auto-allocate-uids --sandbox -L --offline --impure --file ${./systemd-nspawn.nix} --argstr nixpkgs ${nixpkgs}")
+    host.succeed("[[ $(cat ./result/msg) = 'Hello World' ]]")
   '';
 
 }
diff --git a/tests/nixos/containers/systemd-nspawn.nix b/tests/nixos/containers/systemd-nspawn.nix
index f54f32f2a..1dad4ebd7 100644
--- a/tests/nixos/containers/systemd-nspawn.nix
+++ b/tests/nixos/containers/systemd-nspawn.nix
@@ -73,6 +73,8 @@ runCommand "test"
       --resolv-conf=off \
       --bind-ro=/nix/store \
       --bind=$out \
+      --bind=/proc:/run/host/proc \
+      --bind=/sys:/run/host/sys \
       --private-network \
       $toplevel/init
   ''