From 32c336c767e9f9f378e0bf733ef40be16372ff7f Mon Sep 17 00:00:00 2001
From: Robert Helgesson <robert@rycee.net>
Date: Sun, 4 Dec 2022 12:12:32 +0100
Subject: [PATCH] polybar: fix restart trigger

The old trigger would actually never cause a restart since the path
doesn't change. With this change the trigger is now using the actual
configuration path in the Nix store, which depends on the content.

(cherry picked from commit 65700a4fd10aa20ff4a65cbf0ab8b3dc0c438dcb)
---
 modules/services/polybar.nix                  | 24 +++++++++++--------
 .../services/polybar/basic-configuration.nix  |  2 +-
 .../services/polybar/empty-configuration.nix  |  2 +-
 3 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/modules/services/polybar.nix b/modules/services/polybar.nix
index 1ebc0463..d3ac68de 100644
--- a/modules/services/polybar.nix
+++ b/modules/services/polybar.nix
@@ -55,11 +55,17 @@ let
       in "${key}=${value'}";
   };
 
-  configFile = pkgs.writeText "polybar.conf" ''
-    ${toPolybarIni cfg.config}
-    ${toPolybarIni (mapAttrs convertPolybarSection cfg.settings)}
-    ${cfg.extraConfig}
-  '';
+  configFile = let
+    isDeclarativeConfig = cfg.settings != opt.settings.default || cfg.config
+      != opt.config.default || cfg.extraConfig != opt.extraConfig.default;
+  in if isDeclarativeConfig then
+    pkgs.writeText "polybar.conf" ''
+      ${toPolybarIni cfg.config}
+      ${toPolybarIni (mapAttrs convertPolybarSection cfg.settings)}
+      ${cfg.extraConfig}
+    ''
+  else
+    null;
 
 in {
   options = {
@@ -202,16 +208,14 @@ in {
     meta.maintainers = with maintainers; [ h7x4 ];
 
     home.packages = [ cfg.package ];
-    xdg.configFile."polybar/config.ini" = let
-      isDeclarativeConfig = cfg.settings != opt.settings.default || cfg.config
-        != opt.config.default || cfg.extraConfig != opt.extraConfig.default;
-    in mkIf isDeclarativeConfig { source = configFile; };
+    xdg.configFile."polybar/config.ini" =
+      mkIf (configFile != null) { source = configFile; };
 
     systemd.user.services.polybar = {
       Unit = {
         Description = "Polybar status bar";
         PartOf = [ "tray.target" ];
-        X-Restart-Triggers = [ "${config.xdg.configHome}/polybar/config.ini" ];
+        X-Restart-Triggers = mkIf (configFile != null) "${configFile}";
       };
 
       Service = {
diff --git a/tests/modules/services/polybar/basic-configuration.nix b/tests/modules/services/polybar/basic-configuration.nix
index 43d62fe8..5d9c8df5 100644
--- a/tests/modules/services/polybar/basic-configuration.nix
+++ b/tests/modules/services/polybar/basic-configuration.nix
@@ -47,7 +47,7 @@
       serviceFile=home-files/.config/systemd/user/polybar.service
 
       assertFileExists $serviceFile
-      assertFileRegex $serviceFile 'X-Restart-Triggers=.*/.config/polybar/config.ini'
+      assertFileRegex $serviceFile 'X-Restart-Triggers=/nix/store/.*-polybar.conf$'
       assertFileRegex $serviceFile 'ExecStart=.*/bin/polybar-start'
 
       assertFileExists home-files/.config/polybar/config.ini
diff --git a/tests/modules/services/polybar/empty-configuration.nix b/tests/modules/services/polybar/empty-configuration.nix
index e4f2fb4a..26350967 100644
--- a/tests/modules/services/polybar/empty-configuration.nix
+++ b/tests/modules/services/polybar/empty-configuration.nix
@@ -12,7 +12,7 @@
       serviceFile=home-files/.config/systemd/user/polybar.service
 
       assertFileExists $serviceFile
-      assertFileRegex $serviceFile 'X-Restart-Triggers=.*/.config/polybar/config.ini'
+      assertFileNotRegex $serviceFile 'X-Restart-Triggers=/nix/store/.*-polybar.conf$'
       assertFileRegex $serviceFile 'ExecStart=.*/bin/polybar-start'
 
       assertPathNotExists home-files/.config/polybar/config.ini