merge bridge services into one

modules/bridge/service.nix

@@ -0,0 +1,26 @@
+{
+  liminix
+, ifwait
+, lib
+}:
+{ members, ifname } :
+let
+  inherit (liminix.networking) interface;
+  inherit (liminix.services) bundle oneshot;
+  inherit (lib) mkOption types;
+  primary = interface {
+    device = ifname;
+    type = "bridge";
+  };
+  addif = member :
+    oneshot {
+      name = "add-${member.device}-to-br-${primary.device}";
+      up = "${ifwait}/bin/ifwait ${member.device} running && ip link set dev ${member.device} master ${primary.device}";
+      down = "ip link set dev ${member.device} nomaster";
+      dependencies = [ primary member ];
+    };
+
+in (bundle {
+  name = "bridge-${primary.device}-members";
+  contents = [ primary ] ++ map addif members;
+}) // { device = primary.device; }