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/admin/salt/master.nix

@@ -0,0 +1,63 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+
+  cfg  = config.services.salt.master;
+
+  fullConfig = lib.recursiveUpdate {
+    # Provide defaults for some directories to allow an immutable config dir
+
+    # Default is equivalent to /etc/salt/master.d/*.conf
+    default_include = "/var/lib/salt/master.d/*.conf";
+    # Default is in /etc/salt/pki/master
+    pki_dir = "/var/lib/salt/pki/master";
+  } cfg.configuration;
+
+in
+
+{
+  options = {
+    services.salt.master = {
+      enable = mkEnableOption "Salt master service";
+      configuration = mkOption {
+        type = types.attrs;
+        default = {};
+        description = "Salt master configuration as Nix attribute set.";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment = {
+      # Set this up in /etc/salt/master so `salt`, `salt-key`, etc. work.
+      # The alternatives are
+      # - passing --config-dir to all salt commands, not just the master unit,
+      # - setting a global environment variable,
+      etc."salt/master".source = pkgs.writeText "master" (
+        builtins.toJSON fullConfig
+      );
+      systemPackages = with pkgs; [ salt ];
+    };
+    systemd.services.salt-master = {
+      description = "Salt Master";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      path = with pkgs; [
+        util-linux  # for dmesg
+      ];
+      serviceConfig = {
+        ExecStart = "${pkgs.salt}/bin/salt-master";
+        LimitNOFILE = 16384;
+        Type = "notify";
+        NotifyAccess = "all";
+      };
+      restartTriggers = [
+        config.environment.etc."salt/master".source
+      ];
+    };
+  };
+
+  meta.maintainers = with lib.maintainers; [ Flakebi ];
+}