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/mail/postsrsd.nix

@@ -0,0 +1,135 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.postsrsd;
+
+in {
+
+  ###### interface
+
+  options = {
+
+    services.postsrsd = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether to enable the postsrsd SRS server for Postfix.";
+      };
+
+      secretsFile = mkOption {
+        type = types.path;
+        default = "/var/lib/postsrsd/postsrsd.secret";
+        description = "Secret keys used for signing and verification";
+      };
+
+      domain = mkOption {
+        type = types.str;
+        description = "Domain name for rewrite";
+      };
+
+      separator = mkOption {
+        type = types.enum ["-" "=" "+"];
+        default = "=";
+        description = "First separator character in generated addresses";
+      };
+
+      # bindAddress = mkOption { # uncomment once 1.5 is released
+      #   type = types.str;
+      #   default = "127.0.0.1";
+      #   description = "Socket listen address";
+      # };
+
+      forwardPort = mkOption {
+        type = types.int;
+        default = 10001;
+        description = "Port for the forward SRS lookup";
+      };
+
+      reversePort = mkOption {
+        type = types.int;
+        default = 10002;
+        description = "Port for the reverse SRS lookup";
+      };
+
+      timeout = mkOption {
+        type = types.int;
+        default = 1800;
+        description = "Timeout for idle client connections in seconds";
+      };
+
+      excludeDomains = mkOption {
+        type = types.listOf types.str;
+        default = [];
+        description = "Origin domains to exclude from rewriting in addition to primary domain";
+      };
+
+      user = mkOption {
+        type = types.str;
+        default = "postsrsd";
+        description = "User for the daemon";
+      };
+
+      group = mkOption {
+        type = types.str;
+        default = "postsrsd";
+        description = "Group for the daemon";
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    services.postsrsd.domain = mkDefault config.networking.hostName;
+
+    users.users = optionalAttrs (cfg.user == "postsrsd") {
+      postsrsd = {
+        group = cfg.group;
+        uid = config.ids.uids.postsrsd;
+      };
+    };
+
+    users.groups = optionalAttrs (cfg.group == "postsrsd") {
+      postsrsd.gid = config.ids.gids.postsrsd;
+    };
+
+    systemd.services.postsrsd = {
+      description = "PostSRSd SRS rewriting server";
+      after = [ "network.target" ];
+      before = [ "postfix.service" ];
+      wantedBy = [ "multi-user.target" ];
+
+      path = [ pkgs.coreutils ];
+
+      serviceConfig = {
+        ExecStart = ''${pkgs.postsrsd}/sbin/postsrsd "-s${cfg.secretsFile}" "-d${cfg.domain}" -a${cfg.separator} -f${toString cfg.forwardPort} -r${toString cfg.reversePort} -t${toString cfg.timeout} "-X${concatStringsSep "," cfg.excludeDomains}"'';
+        User = cfg.user;
+        Group = cfg.group;
+        PermissionsStartOnly = true;
+      };
+
+      preStart = ''
+        if [ ! -e "${cfg.secretsFile}" ]; then
+          echo "WARNING: secrets file not found, autogenerating!"
+          DIR="$(dirname "${cfg.secretsFile}")"
+          if [ ! -d "$DIR" ]; then
+            mkdir -p -m750 "$DIR"
+            chown "${cfg.user}:${cfg.group}" "$DIR"
+          fi
+          dd if=/dev/random bs=18 count=1 | base64 > "${cfg.secretsFile}"
+          chmod 600 "${cfg.secretsFile}"
+        fi
+        chown "${cfg.user}:${cfg.group}" "${cfg.secretsFile}"
+      '';
+    };
+
+  };
+}