From 6644d0031da7af16effda4287ea2da17506ee415 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@google.com>
Date: Sun, 26 Apr 2020 00:24:49 +0100
Subject: feat(fun/idual && nixos/camden): Add light alarm systemd units

Adds a systemd unit to run the idual light alarm using a transient
timer created by systemd-run.
---
 fun/idual/__init__.py        |  2 ++
 fun/idual/default.nix        | 11 ++++++++---
 ops/nixos/camden/default.nix | 12 +++++++++++-
 3 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/fun/idual/__init__.py b/fun/idual/__init__.py
index 2c0f97170b54..ad103ef049b5 100644
--- a/fun/idual/__init__.py
+++ b/fun/idual/__init__.py
@@ -62,8 +62,10 @@ if __name__ == "__main__":
     #
     # The command sending doesn't always work, hence this brute-force
     # approach.
+    print('Initialising light controller')
     ctrl = LightController()
 
+    print('Turning on the lights. Wakey, wakey!')
     for i in range(9):
         ctrl.send_cmd('morning')
         time.sleep(0.2)
diff --git a/fun/idual/default.nix b/fun/idual/default.nix
index e051f1c812e4..1ac87ab47f0f 100644
--- a/fun/idual/default.nix
+++ b/fun/idual/default.nix
@@ -12,8 +12,13 @@ let
       python.broadlink
     ];
   };
-in lib.fix (self: {
   package = python3Packages.buildPythonPackage opts;
   script  = python3Packages.buildPythonApplication opts;
-  python  = python3.withPackages (_: [ self.package ]);
-})
+in {
+  inherit script;
+  python  = python3.withPackages (_: [ package ]);
+  setAlarm = pkgs.writeShellScriptBin "set-alarm" ''
+    echo "setting an alarm for ''${1}"
+    ${pkgs.systemd}/bin/systemd-run --user --on-calendar="''${1} Europe/London" --unit=light-alarm.service
+  '';
+}
diff --git a/ops/nixos/camden/default.nix b/ops/nixos/camden/default.nix
index 0528e5c3585b..f37d6a1f7884 100644
--- a/ops/nixos/camden/default.nix
+++ b/ops/nixos/camden/default.nix
@@ -1,5 +1,5 @@
 # This file configures camden.tazj.in, my homeserver.
-{ depot, lib, ... }:
+{ depot, pkgs, lib, ... }:
 
 config: let
   nixpkgs = import depot.third_party.nixpkgsSrc {
@@ -100,6 +100,7 @@ in lib.fix(self: {
   environment.systemPackages =
     # programs from the depot
     (with depot; [
+      fun.idual.setAlarm
       third_party.git
       third_party.honk
       third_party.pounce
@@ -347,5 +348,14 @@ in lib.fix(self: {
     };
   };
 
+  # Timer units that can be started with systemd-run to set my alarm.
+  systemd.user.services.light-alarm = {
+    script = "${depot.fun.idual.script}/bin/__init__.py";
+    postStart = "${pkgs.systemd}/bin/systemctl --user stop light-alarm.timer";
+    serviceConfig = {
+      Type = "oneshot";
+    };
+  };
+
   system.stateVersion = "19.09";
 })
-- 
cgit 1.4.1