use systemd unit name attribute

hosts/build02/nixpkgs-update.nix

@@ -25,11 +25,11 @@ let
 
   mkWorker = name: {
     after = [
-      "network-online.target"
+      config.systemd.targets.network-online.name
-      "nixpkgs-update-supervisor.service"
+      config.systemd.services.nixpkgs-update-supervisor.name
     ];
-    wants = [ "network-online.target" ];
+    wants = [ config.systemd.targets.network-online.name ];
-    wantedBy = [ "multi-user.target" ];
+    wantedBy = [ config.systemd.targets.multi-user.name ];
     description = "nixpkgs-update ${name} service";
     enable = true;
     restartIfChanged = true;
@@ -63,8 +63,8 @@ let
   };
 
   mkFetcher = name: cmd: {
-    after = [ "network-online.target" ];
+    after = [ config.systemd.targets.network-online.name ];
-    wants = [ "network-online.target" ];
+    wants = [ config.systemd.targets.network-online.name ];
     path = nixpkgsUpdateSystemDependencies ++ [
       # nixpkgs-update-github-releases
       (pkgs.python3.withPackages (
@@ -121,8 +121,8 @@ in
 
   systemd.services.nixpkgs-update-delete-done = {
     startAt = "0/12:10"; # every 12 hours
-    after = [ "network-online.target" ];
+    after = [ config.systemd.targets.network-online.name ];
-    wants = [ "network-online.target" ];
+    wants = [ config.systemd.targets.network-online.name ];
     description = "nixpkgs-update delete done branches";
     restartIfChanged = true;
     path = nixpkgsUpdateSystemDependencies;
@@ -160,7 +160,7 @@ in
   # Too many workers cause out-of-memory.
 
   systemd.services.nixpkgs-update-supervisor = {
-    wantedBy = [ "multi-user.target" ];
+    wantedBy = [ config.systemd.targets.multi-user.name ];
     description = "nixpkgs-update supervisor service";
     enable = true;
     restartIfChanged = true;

hosts/web02/gandi.nix

@@ -1,5 +1,10 @@
 # This is the configuration required to run NixOS on GandiCloud.
-{ lib, modulesPath, ... }:
+{
+  config,
+  lib,
+  modulesPath,
+  ...
+}:
 {
   imports = [ (modulesPath + "/virtualisation/openstack-config.nix") ];
   config = {
@@ -21,7 +26,7 @@
     boot.kernelParams = [ "console=ttyS0" ];
     systemd.services."serial-getty@ttyS0" = {
       enable = true;
-      wantedBy = [ "multi-user.target" ];
+      wantedBy = [ config.systemd.targets.multi-user.name ];
       serviceConfig.Restart = "always";
     };
 
@@ -31,7 +36,7 @@
     # This is to get a prompt via the "openstack console url show" command
     systemd.services."getty@tty1" = {
       enable = lib.mkForce true;
-      wantedBy = [ "multi-user.target" ];
+      wantedBy = [ config.systemd.targets.multi-user.name ];
       serviceConfig.Restart = "always";
     };
 

modules/nixos/hydra.nix

@@ -62,9 +62,9 @@
       Type = "oneshot";
       TimeoutStartSec = "60";
     };
-    wantedBy = [ "multi-user.target" ];
+    wantedBy = [ config.systemd.targets.multi-user.name ];
-    after = [ "hydra-server.service" ];
+    after = [ config.systemd.services.hydra-server.name ];
-    requires = [ "hydra-server.service" ];
+    requires = [ config.systemd.services.hydra-server.name ];
     environment = {
       inherit (config.systemd.services.hydra-init.environment) HYDRA_DBI;
     };

modules/nixos/monitoring/grafana.nix

@@ -5,7 +5,7 @@
   ...
 }:
 {
-  systemd.services.grafana.after = [ "prometheus.service" ];
+  systemd.services.grafana.after = [ config.systemd.services.prometheus.name ];
 
   age.secrets.grafana-client-secret = {
     file = "${inputs.self}/secrets/grafana-client-secret.age";

modules/nixos/monitoring/matrix-hook.nix

@@ -20,9 +20,9 @@ in
 
   systemd.services.matrix-hook = {
     description = "Matrix Hook";
-    after = [ "network-online.target" ];
+    after = [ config.systemd.targets.network-online.name ];
-    wants = [ "network-online.target" ];
+    wants = [ config.systemd.targets.network-online.name ];
-    wantedBy = [ "multi-user.target" ];
+    wantedBy = [ config.systemd.targets.multi-user.name ];
     environment = {
       HTTP_ADDRESS = "localhost";
       HTTP_PORT = "9088";

modules/nixos/monitoring/prometheus.nix

@@ -1,8 +1,13 @@
-{ inputs, pkgs, ... }:
 {
-  systemd.services.prometheus.after = pkgs.lib.mkForce [ "network-online.target" ];
+  config,
-  systemd.services.prometheus.wants = [ "network-online.target" ];
+  inputs,
-  systemd.services.alertmanager.after = [ "prometheus.service" ];
+  pkgs,
+  ...
+}:
+{
+  systemd.services.prometheus.after = pkgs.lib.mkForce [ config.systemd.targets.network-online.name ];
+  systemd.services.prometheus.wants = [ config.systemd.targets.network-online.name ];
+  systemd.services.alertmanager.after = [ config.systemd.services.prometheus.name ];
 
   services.prometheus = {
     enable = true;

modules/nixos/nur-update.nix

@@ -37,6 +37,6 @@
         Restart = "always";
         RuntimeDirectory = "nur-update";
       };
-      wantedBy = [ "multi-user.target" ];
+      wantedBy = [ config.systemd.targets.multi-user.name ];
     };
 }