From 95e2006653fed23045f651c6d35cee7ceb26c07e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Forsman?= <bjorn.forsman@gmail.com>
Date: Mon, 22 Jul 2013 14:09:13 +0200
Subject: [PATCH] apcupsd-service: put UPS in hibernate mode when shutting down

This adds a special systemd service that calls "apcupsd --killpower"
(put UPS in hibernate mode) just before shutting down the system.
Without this command, the UPS will stay on until the battery is
completely empty.
---
 modules/services/monitoring/apcupsd.nix | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/modules/services/monitoring/apcupsd.nix b/modules/services/monitoring/apcupsd.nix
index 017c896cf4d..163ae3ceff6 100644
--- a/modules/services/monitoring/apcupsd.nix
+++ b/modules/services/monitoring/apcupsd.nix
@@ -156,6 +156,28 @@ in
       };
     };
 
+    # A special service to tell the UPS to power down/hibernate just before the
+    # computer shuts down. (The UPS has a built in delay before it actually
+    # shuts off power.) Copied from here:
+    # http://forums.opensuse.org/english/get-technical-help-here/applications/479499-apcupsd-systemd-killpower-issues.html
+    systemd.services.apcupsd-killpower = {
+      after = [ "shutdown.target" ]; # append umount.target?
+      before = [ "final.target" ];
+      wantedBy = [ "shutdown.target" ];
+      unitConfig = {
+        Description = "APC UPS killpower";
+        ConditionPathExists = "/run/apcupsd/powerfail";
+        DefaultDependencies = "no";
+      };
+      serviceConfig = {
+        Type = "oneshot";
+        ExecStart = "${pkgs.apcupsd}/bin/apcupsd --killpower -f ${configFile}";
+        TimeoutSec = 0;
+        StandardOutput = "tty";
+        RemainAfterExit = "yes";
+      };
+    };
+
   };
 
 }