From e01ccd6245fe1fe34aa49aa48fe3d53e3b013c20 Mon Sep 17 00:00:00 2001
From: Martin Weinelt <hexa@darmstadt.ccc.de>
Date: Mon, 20 Feb 2023 16:54:37 +0100
Subject: [PATCH] home-assistant: Inject extra dependencies through PYTHONPATH

Injecting configuration specific dependencies into the
propagatedBuildInputs of the home-assistant package forces alot of
rebuilds while setting up home-assistant, which is annoying.

By passing optional dependencies into home-assistant via the systemd
units PYTHONPATH environment variable, only he concatenation of
library paths in the systemd unit requires a rebuild.

This also means users can rely heavily on the cached home-assistant
package and will rarely have to build from source, if ever.
---
 nixos/modules/services/home-automation/home-assistant.nix | 1 +
 pkgs/servers/home-assistant/default.nix                   | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/services/home-automation/home-assistant.nix b/nixos/modules/services/home-automation/home-assistant.nix
index 9f6f153a1056..6adc58ec58ec 100644
--- a/nixos/modules/services/home-automation/home-assistant.nix
+++ b/nixos/modules/services/home-automation/home-assistant.nix
@@ -409,6 +409,7 @@ in {
         (optionalString (cfg.config != null) copyConfig) +
         (optionalString (cfg.lovelaceConfig != null) copyLovelaceConfig)
       ;
+      environment.PYTHONPATH = package.pythonPath;
       serviceConfig = let
         # List of capabilities to equip home-assistant with, depending on configured components
         capabilities = lib.unique ([
diff --git a/pkgs/servers/home-assistant/default.nix b/pkgs/servers/home-assistant/default.nix
index 7ff1473edec3..b5e42fca6ae4 100644
--- a/pkgs/servers/home-assistant/default.nix
+++ b/pkgs/servers/home-assistant/default.nix
@@ -355,7 +355,7 @@ in python.pkgs.buildPythonApplication rec {
     yarl
     # Implicit dependency via homeassistant/requirements.py
     setuptools
-  ] ++ componentBuildInputs ++ extraBuildInputs;
+  ];
 
   makeWrapperArgs = lib.optional skipPip "--add-flags --skip-pip";
 
@@ -431,6 +431,7 @@ in python.pkgs.buildPythonApplication rec {
       getPackages
       python
       supportedComponentsWithTests;
+    pythonPath = python3.pkgs.makePythonPath (componentBuildInputs ++ extraBuildInputs);
     intents = python.pkgs.home-assistant-intents;
     tests = {
       nixos = nixosTests.home-assistant;