nixos/timezone: support imperative timezone configuration (#26608)

Fixes #26469.

1 files changed, 45 insertions, 0 deletions

diff --git a/nixos/tests/timezone.nix b/nixos/tests/timezone.nix
new file mode 100644
index 000000000000..2204649a3fc4
--- /dev/null
+++ b/nixos/tests/timezone.nix
@@ -0,0 +1,45 @@
+{
+  timezone-static = import ./make-test.nix ({ pkgs, ... }: {
+    name = "timezone-static";
+    meta.maintainers = with pkgs.lib.maintainers; [ lheckemann ];
+
+    machine.time.timeZone = "Europe/Amsterdam";
+
+    testScript = ''
+      $machine->waitForUnit("dbus.socket");
+      $machine->fail("timedatectl set-timezone Asia/Tokyo");
+      my @dateResult = $machine->execute('date -d @0 "+%Y-%m-%d %H:%M:%S"');
+      $dateResult[1] eq "1970-01-01 01:00:00\n" or die "Timezone seems to be wrong";
+    '';
+  });
+
+  timezone-imperative = import ./make-test.nix ({ pkgs, ... }: {
+    name = "timezone-imperative";
+    meta.maintainers = with pkgs.lib.maintainers; [ lheckemann ];
+
+    machine.time.timeZone = null;
+
+    testScript = ''
+      $machine->waitForUnit("dbus.socket");
+
+      # Should default to UTC
+      my @dateResult = $machine->execute('date -d @0 "+%Y-%m-%d %H:%M:%S"');
+      print $dateResult[1];
+      $dateResult[1] eq "1970-01-01 00:00:00\n" or die "Timezone seems to be wrong";
+
+      $machine->succeed("timedatectl set-timezone Asia/Tokyo");
+
+      # Adjustment should be taken into account
+      my @dateResult = $machine->execute('date -d @0 "+%Y-%m-%d %H:%M:%S"');
+      print $dateResult[1];
+      $dateResult[1] eq "1970-01-01 09:00:00\n" or die "Timezone was not adjusted";
+
+      # Adjustment should persist across a reboot
+      $machine->shutdown;
+      $machine->waitForUnit("dbus.socket");
+      my @dateResult = $machine->execute('date -d @0 "+%Y-%m-%d %H:%M:%S"');
+      print $dateResult[1];
+      $dateResult[1] eq "1970-01-01 09:00:00\n" or die "Timezone adjustment was not persisted";
+    '';
+  });
+}