Add 'nixpkgs/' from commit 'abf060725d7614bd3b9f96764262dfbc2f9c2199'

git-subtree-dir: nixpkgs
git-subtree-mainline: 4e31070265257dc67d120c27e0f75c2344fdfa9a
git-subtree-split: abf060725d7614bd3b9f96764262dfbc2f9c2199

1 files changed, 27 insertions, 0 deletions

diff --git a/nixpkgs/nixos/modules/system/boot/shutdown.nix b/nixpkgs/nixos/modules/system/boot/shutdown.nix
new file mode 100644
index 000000000000..11041066e07c
--- /dev/null
+++ b/nixpkgs/nixos/modules/system/boot/shutdown.nix
@@ -0,0 +1,27 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+
+  # This unit saves the value of the system clock to the hardware
+  # clock on shutdown.
+  systemd.services.save-hwclock =
+    { description = "Save Hardware Clock";
+
+      wantedBy = [ "shutdown.target" ];
+
+      unitConfig = {
+        DefaultDependencies = false;
+        ConditionPathExists = "/dev/rtc";
+      };
+
+      serviceConfig = {
+        Type = "oneshot";
+        ExecStart = "${pkgs.utillinux}/sbin/hwclock --systohc ${if config.time.hardwareClockInLocalTime then "--localtime" else "--utc"}";
+      };
+    };
+
+  boot.kernel.sysctl."kernel.poweroff_cmd" = "${config.systemd.package}/sbin/poweroff";
+
+}