working on harmonia

tests/tzupdate/configuration.nix

@@ -0,0 +1,67 @@
+{ pkgs, lib, config, modulesPath, ... }:
+let
+  name = config.networking.hostName;
+  moduleList = import "${modulesPath}/module-list.nix";
+
+  dynixFromSearchPath = let
+    res = builtins.tryEval <dynix>;
+  in lib.optional res.success res.value;
+in
+{
+  imports = [
+    "${modulesPath}/testing/test-instrumentation.nix"
+    ./hardware-configuration.nix
+  ] ++ lib.concatLists [
+    moduleList
+    dynixFromSearchPath
+  ];
+
+  dynamicism.for.tzupdate.enable = true;
+  services.tzupdate = {
+    enable = true;
+  };
+
+  system.switch.enable = true;
+  documentation.enable = false;
+
+  networking.hostName = "tzupdate-machine";
+
+  boot.loader.grub = {
+    enable = true;
+    device = "/dev/vda";
+    forceInstall = true;
+  };
+
+  nix = {
+    package = pkgs.lixPackageSets.latest.lix;
+    nixPath = [
+      "nixpkgs=${pkgs.path}"
+      "/nix/var/nix/profiles/per-user/root/profile/share/nixos/modules"
+    ];
+
+    settings = {
+      experimental-features = [ "nix-command" "pipe-operator" ];
+      substituters = lib.mkForce [ ];
+      hashed-mirrors = null;
+      connect-timeout = 1;
+      # For my debugging purposes.
+      show-trace = true;
+    };
+  };
+
+  environment.pathsToLink = [ "/share" ];
+  environment.extraOutputsToInstall = [ "modules" ];
+  environment.variables = {
+    "NIXOS_CONFIG" = "/etc/nixos/configuration.nix";
+  };
+
+  environment.shellAliases = {
+    ls = "eza --long --header --group --group-directories-first --classify --binary";
+  };
+
+  environment.systemPackages = with pkgs; [
+    eza
+    fd
+    ripgrep
+  ];
+}

tests/tzupdate/hardware-configuration.nix

@@ -0,0 +1,4 @@
+{ ... }:
+{
+
+}

tests/tzupdate/test-script.py

@@ -0,0 +1,52 @@
+#from pathlib import Path
+#import shlex
+#import textwrap
+from typing import cast, TYPE_CHECKING
+
+from beartype import beartype
+
+from test_driver.machine import Machine
+from test_driver.errors import RequestedAssertionFailed
+
+if TYPE_CHECKING:
+    global machine
+    machine = cast(Machine, ...)
+    assert machine.shell is not None
+
+ls = "eza -lah --color=always --group-directories-first"
+
+@beartype
+def run_log(machine: Machine, *commands: str, timeout: int | None = 60) -> str:
+    output = ""
+    for command in commands:
+        with machine.nested(f"must succeed: {command}"):
+            (status, out) = machine.execute(f"{command} | tee /dev/stderr", timeout=timeout)
+            if status != 0:
+                machine.log(f"output: {out}")
+                raise RequestedAssertionFailed(
+                    f"command `{command}` failed (exit code {status})",
+                )
+            output += out
+
+    return output
+
+machine.wait_for_unit("default.target")
+assert "lix" in machine.succeed("nix --version").lower()
+machine.log("INIT")
+
+
+machine.succeed("nixos-generate-config")
+machine.succeed("mkdir -vp /etc/nixos")
+# Dereference is required since that configuration.nix is probably a symlink to the store.
+machine.succeed("cp -rv --dereference /run/current-system/sw/share/nixos/configuration.nix /etc/nixos/")
+
+machine.succeed("env PAGER= nixos-rebuild switch --log-format raw-with-logs --fallback")
+
+@beartype
+def get_interval() -> str:
+    prop = machine.get_unit_property("tzupdate.timer", "OnCalendar")
+    print(f"{prop=}")
+
+    return prop
+
+get_interval()

tests/tzupdate/test.nix

@@ -0,0 +1,24 @@
+{ ... }:
+
+{
+  name = "nixos-test-dynamicism-tzupdate";
+
+  extraPythonPackages = p: [
+    p.beartype
+  ];
+
+  nodes.machine = { name, pkgs, ... }: {
+    imports = [ ./configuration.nix ];
+
+    environment.systemPackages = let
+      configFileTree = pkgs.runCommand "${name}-configuration-dot-nix" { } ''
+        set -euo pipefail
+        install -Dm a=r ${./configuration.nix} "$out/share/nixos/configuration.nix"
+      '';
+    in [
+      configFileTree
+    ];
+  };
+
+  testScript = builtins.readFile ./test-script.py;
+}