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/modules/services/networking/go-neb.nix

@@ -0,0 +1,79 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.go-neb;
+
+  settingsFormat = pkgs.formats.yaml {};
+  configFile = settingsFormat.generate "config.yaml" cfg.config;
+in {
+  options.services.go-neb = {
+    enable = mkEnableOption "Extensible matrix bot written in Go";
+
+    bindAddress = mkOption {
+      type = types.str;
+      description = "Port (and optionally address) to listen on.";
+      default = ":4050";
+    };
+
+    secretFile = mkOption {
+      type = types.nullOr types.path;
+      default = null;
+      example = "/run/keys/go-neb.env";
+      description = ''
+        Environment variables from this file will be interpolated into the
+        final config file using envsubst with this syntax: <literal>$ENVIRONMENT</literal>
+        or <literal>''${VARIABLE}</literal>.
+        The file should contain lines formatted as <literal>SECRET_VAR=SECRET_VALUE</literal>.
+        This is useful to avoid putting secrets into the nix store.
+      '';
+    };
+
+    baseUrl = mkOption {
+      type = types.str;
+      description = "Public-facing endpoint that can receive webhooks.";
+    };
+
+    config = mkOption {
+      inherit (settingsFormat) type;
+      description = ''
+        Your <filename>config.yaml</filename> as a Nix attribute set.
+        See <link xlink:href="https://github.com/matrix-org/go-neb/blob/master/config.sample.yaml">config.sample.yaml</link>
+        for possible options.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.go-neb = let
+      finalConfigFile = if cfg.secretFile == null then configFile else "/var/run/go-neb/config.yaml";
+    in {
+      description = "Extensible matrix bot written in Go";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      environment = {
+        BASE_URL = cfg.baseUrl;
+        BIND_ADDRESS = cfg.bindAddress;
+        CONFIG_FILE = finalConfigFile;
+      };
+
+      serviceConfig = {
+        ExecStartPre = lib.optional (cfg.secretFile != null)
+          (pkgs.writeShellScript "pre-start" ''
+            umask 077
+            export $(xargs < ${cfg.secretFile})
+            ${pkgs.envsubst}/bin/envsubst -i "${configFile}" > ${finalConfigFile}
+            chown go-neb ${finalConfigFile}
+          '');
+        PermissionsStartOnly = true;
+        RuntimeDirectory = "go-neb";
+        ExecStart = "${pkgs.go-neb}/bin/go-neb";
+        User = "go-neb";
+        DynamicUser = true;
+      };
+    };
+  };
+
+  meta.maintainers = with maintainers; [ hexa maralorn ];
+}