uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/tests/frr.nix

@@ -0,0 +1,104 @@
+# This test runs FRR and checks if OSPF routing works.
+#
+# Network topology:
+#   [ client ]--net1--[ router1 ]--net2--[ router2 ]--net3--[ server ]
+#
+# All interfaces are in OSPF Area 0.
+
+import ./make-test-python.nix ({ pkgs, ... }:
+  let
+
+    ifAddr = node: iface: (pkgs.lib.head node.config.networking.interfaces.${iface}.ipv4.addresses).address;
+
+    ospfConf1 = ''
+      router ospf
+        network 192.168.0.0/16 area 0
+    '';
+
+    ospfConf2 = ''
+      interface eth2
+        ip ospf hello-interval 1
+        ip ospf dead-interval 5
+      !
+      router ospf
+        network 192.168.0.0/16 area 0
+    '';
+
+  in
+    {
+      name = "frr";
+
+      meta = with pkgs.lib.maintainers; {
+        maintainers = [ hexa ];
+      };
+
+      nodes = {
+
+        client =
+          { nodes, ... }:
+          {
+            virtualisation.vlans = [ 1 ];
+            networking.defaultGateway = ifAddr nodes.router1 "eth1";
+          };
+
+        router1 =
+          { ... }:
+          {
+            virtualisation.vlans = [ 1 2 ];
+            boot.kernel.sysctl."net.ipv4.ip_forward" = "1";
+            networking.firewall.extraCommands = "iptables -A nixos-fw -i eth2 -p ospfigp -j ACCEPT";
+            services.frr.ospf = {
+              enable = true;
+              config = ospfConf1;
+            };
+
+            specialisation.ospf.configuration = {
+              services.frr.ospf.config = ospfConf2;
+            };
+          };
+
+        router2 =
+          { ... }:
+          {
+            virtualisation.vlans = [ 3 2 ];
+            boot.kernel.sysctl."net.ipv4.ip_forward" = "1";
+            networking.firewall.extraCommands = "iptables -A nixos-fw -i eth2 -p ospfigp -j ACCEPT";
+            services.frr.ospf = {
+              enable = true;
+              config = ospfConf2;
+            };
+          };
+
+        server =
+          { nodes, ... }:
+          {
+            virtualisation.vlans = [ 3 ];
+            networking.defaultGateway = ifAddr nodes.router2 "eth1";
+          };
+      };
+
+      testScript =
+        { nodes, ... }:
+        ''
+          start_all()
+
+          # Wait for the networking to start on all machines
+          for machine in client, router1, router2, server:
+              machine.wait_for_unit("network.target")
+
+          with subtest("Wait for Zebra and OSPFD"):
+              for gw in router1, router2:
+                  gw.wait_for_unit("zebra")
+                  gw.wait_for_unit("ospfd")
+
+          router1.succeed("${nodes.router1.config.system.build.toplevel}/specialisation/ospf/bin/switch-to-configuration test >&2")
+
+          with subtest("Wait for OSPF to form adjacencies"):
+              for gw in router1, router2:
+                  gw.wait_until_succeeds("vtysh -c 'show ip ospf neighbor' | grep Full")
+                  gw.wait_until_succeeds("vtysh -c 'show ip route' | grep '^O>'")
+
+          with subtest("Test ICMP"):
+              client.wait_until_succeeds("ping -c 3 server >&2")
+        '';
+    })