systemd: install systemd files when user is root (revert c2aa831) (#9274)

* systemd: install systemd files when user is root (revert c2aa831)

* Apply suggestions from code review

Co-authored-by: Anillc <void@anil.lc>

---------

Co-authored-by: Anillc <void@anil.lc>

modules/services/pipewire.nix

@@ -467,7 +467,7 @@ in
 
         systemctl = "${ensureSystemd} systemctl";
       in
-      mkIf (systemdCfg.enable && config.home.username != "root") (
+      mkIf systemdCfg.enable (
         hm.dag.entryAfter [ "onFilesChange" "reloadSystemd" ] ''
           if [[ -v PIPEWIRE_RELOAD ]]; then
             if [[ -v DRY_RUN ]]; then

modules/systemd.nix

@@ -454,8 +454,7 @@ in
 
   # If we run under a Linux system we assume that systemd is
   # available, in particular we assume that systemctl is in PATH.
-  # Do not install any user services if username is root.
-  config = mkIf (cfg.enable && config.home.username != "root") {
+  config = mkIf cfg.enable {
     assertions = [
       (lib.hm.assertions.assertPlatform "systemd" pkgs lib.platforms.linux)
     ];

tests/modules/systemd/default.nix

@@ -1,7 +1,6 @@
 {
   systemd-services = ./services.nix;
   systemd-packages = ./packages.nix;
-  systemd-services-disabled-for-root = ./services-disabled-for-root.nix;
   systemd-session-variables = ./session-variables.nix;
   systemd-user-config = ./user-config.nix;
   systemd-empty-user-config = ./empty-user-config.nix;

tests/modules/systemd/services-disabled-for-root.nix

@@ -1,24 +0,0 @@
-{ lib, ... }:
-
-{
-  home.username = lib.mkForce "root";
-
-  systemd.user.services."test-service@" = {
-    Unit = {
-      Description = "A basic test service";
-    };
-
-    Service = {
-      Environment = [
-        "VAR1=1"
-        "VAR2=2"
-      ];
-      ExecStart = ''/some/exec/start/command --with-arguments "%i"'';
-    };
-  };
-
-  nmt.script = ''
-    serviceFile=home-files/.config/systemd/user/test-service@.service
-    assertPathNotExists $serviceFile
-  '';
-}