acme-dns.nix: one systemd attrset (statix W20) — lint gate green

statix flagged the repeated `systemd.` keys (tmpfiles marker, acme-dns
daemon, traefik handoff oneshot); they are now one nested attrset. Purely
structural: `#cc-ci` still evaluates. With #33 this makes the push
self-test's lint stage pass again.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FqkQq3CDmFWcQ7u1LzoyRz

nix/modules/acme-dns.nix

@@ -60,79 +60,86 @@ in
 
   environment.etc."acme-dns/lego.env".source = legoEnvironment;
 
-  # The staging order has completed successfully. This marker permits the
-  # production ACME post-run hook to hand a renewed certificate to Traefik.
-  systemd.tmpfiles.rules = [
-    "f /var/lib/ci-certs/acme-production-enabled 0600 root root -"
-  ];
 
   networking.firewall = {
     allowedTCPPorts = [ 53 ];
     allowedUDPPorts = [ 53 ];
   };
 
-  systemd.services.acme-dns = {
+
-    description = "Restricted authoritative DNS for cc-ci ACME DNS-01";
+
-    wantedBy = [ "multi-user.target" ];
+  # One `systemd` attrset (statix W20): the tmpfiles marker, the acme-dns daemon and the
-    after = [ "network-online.target" ];
+  # traefik handoff oneshot.
-    wants = [ "network-online.target" ];
+  systemd = {
-    serviceConfig = {
+    # The staging order has completed successfully. This marker permits the
-      User = "acme-dns";
+    # production ACME post-run hook to hand a renewed certificate to Traefik.
-      Group = "acme-dns";
+    tmpfiles.rules = [
-      StateDirectory = "acme-dns";
+      "f /var/lib/ci-certs/acme-production-enabled 0600 root root -"
-      StateDirectoryMode = "0700";
+    ];
-      WorkingDirectory = "/var/lib/acme-dns";
+
-      ExecStart = "${pkgs.acme-dns}/bin/acme-dns -c ${acmeDnsConfig}";
+    services.acme-dns = {
-      Restart = "on-failure";
+      description = "Restricted authoritative DNS for cc-ci ACME DNS-01";
-      RestartSec = "5s";
+      wantedBy = [ "multi-user.target" ];
-      AmbientCapabilities = [ "CAP_NET_BIND_SERVICE" ];
+      after = [ "network-online.target" ];
-      CapabilityBoundingSet = [ "CAP_NET_BIND_SERVICE" ];
+      wants = [ "network-online.target" ];
-      NoNewPrivileges = true;
+      serviceConfig = {
-      PrivateTmp = true;
+        User = "acme-dns";
-      PrivateDevices = true;
+        Group = "acme-dns";
-      ProtectHome = true;
+        StateDirectory = "acme-dns";
-      ProtectSystem = "strict";
+        StateDirectoryMode = "0700";
-      ReadWritePaths = [ "/var/lib/acme-dns" ];
+        WorkingDirectory = "/var/lib/acme-dns";
-      RestrictAddressFamilies = [ "AF_INET" "AF_UNIX" ];
+        ExecStart = "${pkgs.acme-dns}/bin/acme-dns -c ${acmeDnsConfig}";
+        Restart = "on-failure";
+        RestartSec = "5s";
+        AmbientCapabilities = [ "CAP_NET_BIND_SERVICE" ];
+        CapabilityBoundingSet = [ "CAP_NET_BIND_SERVICE" ];
+        NoNewPrivileges = true;
+        PrivateTmp = true;
+        PrivateDevices = true;
+        ProtectHome = true;
+        ProtectSystem = "strict";
+        ReadWritePaths = [ "/var/lib/acme-dns" ];
+        RestrictAddressFamilies = [ "AF_INET" "AF_UNIX" ];
+      };
     };
-  };
 
-  # Traefik consumes its wildcard as immutable Swarm secrets, so a renewed
+    # Traefik consumes its wildcard as immutable Swarm secrets, so a renewed
-  # host certificate must be copied and reconciled rather than merely reloaded.
+    # host certificate must be copied and reconciled rather than merely reloaded.
-  # This service is started only by the production-mode ACME postRun hook.
+    # This service is started only by the production-mode ACME postRun hook.
-  systemd.services.cc-ci-acme-traefik-handoff = {
+    services.cc-ci-acme-traefik-handoff = {
-    description = "Install renewed cc-ci wildcard into Traefik Swarm secrets";
+      description = "Install renewed cc-ci wildcard into Traefik Swarm secrets";
-    after = [ "docker.service" "deploy-proxy.service" ];
+      after = [ "docker.service" "deploy-proxy.service" ];
-    requires = [ "docker.service" ];
+      requires = [ "docker.service" ];
-    path = [ pkgs.coreutils pkgs.docker pkgs.systemd pkgs.gnugrep ];
+      path = [ pkgs.coreutils pkgs.docker pkgs.systemd pkgs.gnugrep ];
-    serviceConfig = {
+      serviceConfig = {
-      Type = "oneshot";
+        Type = "oneshot";
-      UMask = "0077";
+        UMask = "0077";
+      };
+      script = ''
+        src=/var/lib/acme/ci.commoninternet.net
+        dst=/var/lib/ci-certs/live
+        test -s "$src/fullchain.pem"
+        test -s "$src/key.pem"
+        install -d -m 0700 "$dst"
+        install -m 0444 "$src/fullchain.pem" "$dst/fullchain.pem.new"
+        install -m 0400 "$src/key.pem" "$dst/privkey.pem.new"
+        mv -f "$dst/fullchain.pem.new" "$dst/fullchain.pem"
+        mv -f "$dst/privkey.pem.new" "$dst/privkey.pem"
+
+        # deploy-proxy performs the health-gated Swarm rollout. Its reconciler
+        # derives a fresh version from the public certificate chain and inserts
+        # the matching ssl_cert/ssl_key secrets before deploying Traefik.
+        systemctl restart deploy-proxy.service
+
+        # A successful rollout no longer references old wildcard versions. Best
+        # effort removal retains any secret Docker still reports as in use.
+        keep="v$(sha256sum "$dst/fullchain.pem" | cut -c1-16)"
+        docker secret ls --format '{{.Name}}' | \
+          grep -E '^traefik_ci_commoninternet_net_ssl_(cert|key)_v' | \
+          grep -v -E "_(ssl_cert|ssl_key)_$keep\$" | \
+          while IFS= read -r stale; do docker secret rm "$stale" || true; done
+      '';
     };
-    script = ''
-      src=/var/lib/acme/ci.commoninternet.net
-      dst=/var/lib/ci-certs/live
-      test -s "$src/fullchain.pem"
-      test -s "$src/key.pem"
-      install -d -m 0700 "$dst"
-      install -m 0444 "$src/fullchain.pem" "$dst/fullchain.pem.new"
-      install -m 0400 "$src/key.pem" "$dst/privkey.pem.new"
-      mv -f "$dst/fullchain.pem.new" "$dst/fullchain.pem"
-      mv -f "$dst/privkey.pem.new" "$dst/privkey.pem"
-
-      # deploy-proxy performs the health-gated Swarm rollout. Its reconciler
-      # derives a fresh version from the public certificate chain and inserts
-      # the matching ssl_cert/ssl_key secrets before deploying Traefik.
-      systemctl restart deploy-proxy.service
-
-      # A successful rollout no longer references old wildcard versions. Best
-      # effort removal retains any secret Docker still reports as in use.
-      keep="v$(sha256sum "$dst/fullchain.pem" | cut -c1-16)"
-      docker secret ls --format '{{.Name}}' | \
-        grep -E '^traefik_ci_commoninternet_net_ssl_(cert|key)_v' | \
-        grep -v -E "_(ssl_cert|ssl_key)_$keep\$" | \
-        while IFS= read -r stale; do docker secret rm "$stale" || true; done
-    '';
   };
 
   security.acme = {