1 files changed, 48 insertions, 0 deletions
diff --git a/nixpkgs/nixos/tests/systemd-initrd-simple.nix b/nixpkgs/nixos/tests/systemd-initrd-simple.nix
new file mode 100644
index 000000000000..2b7283a82193
--- /dev/null
+++ b/nixpkgs/nixos/tests/systemd-initrd-simple.nix
@@ -0,0 +1,48 @@
+import ./make-test-python.nix ({ lib, pkgs, ... }: {
+  name = "systemd-initrd-simple";
+
+  nodes.machine = { pkgs, ... }: {
+    testing.initrdBackdoor = true;
+    boot.initrd.systemd.enable = true;
+    virtualisation.fileSystems."/".autoResize = true;
+  };
+
+  testScript = ''
+    import subprocess
+
+    with subtest("testing initrd backdoor"):
+        machine.wait_for_unit("initrd.target")
+        machine.succeed("systemctl status initrd-fs.target")
+        machine.switch_root()
+
+    with subtest("handover to stage-2 systemd works"):
+        machine.wait_for_unit("multi-user.target")
+        machine.succeed("systemd-analyze | grep -q '(initrd)'")  # direct handover
+        machine.succeed("touch /testfile")  # / is writable
+        machine.fail("touch /nix/store/testfile")  # /nix/store is not writable
+        # Special filesystems are mounted by systemd
+        machine.succeed("[ -e /run/booted-system ]") # /run
+        machine.succeed("[ -e /sys/class ]") # /sys
+        machine.succeed("[ -e /dev/null ]") # /dev
+        machine.succeed("[ -e /proc/1 ]") # /proc
+        # stage-2-init mounted more special filesystems
+        machine.succeed("[ -e /dev/shm ]") # /dev/shm
+        machine.succeed("[ -e /dev/pts/ptmx ]") # /dev/pts
+        machine.succeed("[ -e /run/keys ]") # /run/keys
+
+    with subtest("groups work"):
+        machine.fail("journalctl -b 0 | grep 'systemd-udevd.*Unknown group.*ignoring'")
+
+    with subtest("growfs works"):
+        oldAvail = machine.succeed("df --output=avail / | sed 1d")
+        machine.shutdown()
+
+        subprocess.check_call(["qemu-img", "resize", "vm-state-machine/machine.qcow2", "+1G"])
+
+        machine.start()
+        machine.switch_root()
+        newAvail = machine.succeed("df --output=avail / | sed 1d")
+
+        assert int(oldAvail) < int(newAvail), "File system did not grow"
+  '';
+})