remove non-building ntp service from test config

vanilla-configuration.nix

@@ -2,6 +2,7 @@
 let
   inherit (pkgs.liminix.networking) interface address udhcpc odhcpc route;
   inherit (pkgs.liminix.services) oneshot longrun bundle target;
+  inherit (pkgs) writeText;
 in rec {
   imports = [
     ./modules/tftpboot.nix
@@ -17,24 +18,6 @@ in rec {
     let iface = interface { type = "hardware"; device = "eth1"; };
     in odhcpc iface { uid = "e7"; };
 
-  services.ntp = longrun {
-    name = "ntp";
-    run = let inherit (services) dhcpv4 dhcpv6;
-          in "${pkgs.ntp}/bin/ntpd $(output ${dhcpv4} ntp_servers) $(output ${dhcpv6} NTP_IP)";
-
-    # I don't think it's possible to standardise the file names
-    # generally, as different services have different outputs, but it
-    # would be cool if services that provide an interface could use
-    # the same name as each other. e.g. for anything implementing
-    # addressProvider you might expect (output svc "address") or
-    # (output svc "family") to work. Otherwise switching a network link
-    # from static to dhcp might require reviewing all the downstreams
-    # that refer to it.
-    # Also, services should declare the outputs they provide
-    outputs = [];
-    dependencies = [services.dhcpv4];
-  };
-
   services.defaultroute4 = route {
     name = "defautlrote";
     via = "$(output ${services.dhcpv4} address)";
@@ -53,6 +36,17 @@ in rec {
       dependencies = [iface];
     };
 
+  services.ntp =
+    let config = writeText "chrony.conf" ''
+      pool pool.ntp.org iburst
+      dumpdir /run/chrony
+      makestep 1.0 3
+    '';
+    in longrun {
+      name = "ntp";
+      run = "${pkgs.chrony}/bin/chronyd -f ${config} -d";
+    };
+
   services.default = target {
     name = "default";
     contents = with services; [ loopback ntp defaultroute4 ];