nixos/network-interfaces-systemd: add bridge interfaces in systemd-initrd

nixos/modules/tasks/network-interfaces-systemd.nix

@@ -173,6 +173,20 @@ let
     }];
   }));
 
+  bridgeNetworks = mkMerge (flip mapAttrsToList cfg.bridges (name: bridge: {
+    netdevs."40-${name}" = {
+      netdevConfig = {
+        Name = name;
+        Kind = "bridge";
+      };
+    };
+    networks = listToAttrs (forEach bridge.interfaces (bi:
+      nameValuePair "40-${bi}" (mkMerge [ (genericNetwork (mkOverride 999)) {
+        DHCP = mkOverride 0 (dhcpStr false);
+        networkConfig.Bridge = name;
+      } ])));
+  }));
+
   vlanNetworks = mkMerge (flip mapAttrsToList cfg.vlans (name: vlan: {
     netdevs."40-${name}" = {
       netdevConfig = {
@@ -198,9 +212,11 @@ in
     boot.initrd.systemd.network = mkMerge [
       (genericDhcpNetworks true)
       interfaceNetworks
+      bridgeNetworks
       vlanNetworks
     ];
     boot.initrd.availableKernelModules =
+      optional (cfg.bridges != {}) "bridge" ++
       optional (cfg.vlans != {}) "8021q";
   })
 
@@ -231,19 +247,7 @@ in
       }
       (genericDhcpNetworks false)
       interfaceNetworks
-      (mkMerge (flip mapAttrsToList cfg.bridges (name: bridge: {
+      bridgeNetworks
-        netdevs."40-${name}" = {
-          netdevConfig = {
-            Name = name;
-            Kind = "bridge";
-          };
-        };
-        networks = listToAttrs (forEach bridge.interfaces (bi:
-          nameValuePair "40-${bi}" (mkMerge [ (genericNetwork (mkOverride 999)) {
-            DHCP = mkOverride 0 (dhcpStr false);
-            networkConfig.Bridge = name;
-          } ])));
-      })))
       (mkMerge (flip mapAttrsToList cfg.bonds (name: bond: {
         netdevs."40-${name}" = {
           netdevConfig = {