support dhcp static leases

modules/dnsmasq/service.nix

@@ -10,13 +10,17 @@
 , domain
 , group
 , ranges
+, hosts
 , upstreams
 , resolvconf
 }:
 let
   name = "${interface.name}.dnsmasq";
   inherit (liminix.services) longrun;
-  inherit (lib) concatStringsSep;
+  inherit (lib) concatStrings concatStringsSep mapAttrsToList;
+  hostOpt = name : { mac, v4, v6, leasetime } @ attrs:
+    let v6s = concatStrings (map (a : ",[${a}]") v6);
+    in "--dhcp-host=${mac},${v4}${v6s},${name},${builtins.toString leasetime}";
 in
 longrun {
   inherit name;
@@ -33,6 +37,7 @@ longrun {
     --keep-in-foreground \
     --dhcp-authoritative \
     ${if resolvconf != null then "--resolv-file=$(output_path ${resolvconf} resolv.conf)" else "--no-resolv"} \
+    ${lib.concatStringsSep " " (mapAttrsToList hostOpt hosts)} \
     --no-hosts \
     --log-dhcp \
     --enable-ra \