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/dspam.nix

@@ -0,0 +1,150 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.dspam;
+
+  dspam = pkgs.dspam;
+
+  defaultSock = "/run/dspam/dspam.sock";
+
+  cfgfile = pkgs.writeText "dspam.conf" ''
+    Home /var/lib/dspam
+    StorageDriver ${dspam}/lib/dspam/lib${cfg.storageDriver}_drv.so
+
+    Trust root
+    Trust ${cfg.user}
+    SystemLog on
+    UserLog on
+
+    ${optionalString (cfg.domainSocket != null) ''
+      ServerDomainSocketPath "${cfg.domainSocket}"
+      ClientHost "${cfg.domainSocket}"
+    ''}
+
+    ${cfg.extraConfig}
+  '';
+
+in {
+
+  ###### interface
+
+  options = {
+
+    services.dspam = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether to enable the dspam spam filter.";
+      };
+
+      user = mkOption {
+        type = types.str;
+        default = "dspam";
+        description = "User for the dspam daemon.";
+      };
+
+      group = mkOption {
+        type = types.str;
+        default = "dspam";
+        description = "Group for the dspam daemon.";
+      };
+
+      storageDriver = mkOption {
+        type = types.str;
+        default = "hash";
+        description =  "Storage driver backend to use for dspam.";
+      };
+
+      domainSocket = mkOption {
+        type = types.nullOr types.path;
+        default = defaultSock;
+        description = "Path to local domain socket which is used for communication with the daemon. Set to null to disable UNIX socket.";
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = "Additional dspam configuration.";
+      };
+
+      maintenanceInterval = mkOption {
+        type = types.nullOr types.str;
+        default = null;
+        description = "If set, maintenance script will be run at specified (in systemd.timer format) interval";
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable (mkMerge [
+    {
+      users.users = optionalAttrs (cfg.user == "dspam") {
+        dspam = {
+          group = cfg.group;
+          uid = config.ids.uids.dspam;
+        };
+      };
+
+      users.groups = optionalAttrs (cfg.group == "dspam") {
+        dspam.gid = config.ids.gids.dspam;
+      };
+
+      environment.systemPackages = [ dspam ];
+
+      environment.etc."dspam/dspam.conf".source = cfgfile;
+
+      systemd.services.dspam = {
+        description = "dspam spam filtering daemon";
+        wantedBy = [ "multi-user.target" ];
+        after = [ "postgresql.service" ];
+        restartTriggers = [ cfgfile ];
+
+        serviceConfig = {
+          ExecStart = "${dspam}/bin/dspam --daemon --nofork";
+          User = cfg.user;
+          Group = cfg.group;
+          RuntimeDirectory = optional (cfg.domainSocket == defaultSock) "dspam";
+          RuntimeDirectoryMode = optional (cfg.domainSocket == defaultSock) "0750";
+          StateDirectory = "dspam";
+          StateDirectoryMode = "0750";
+          LogsDirectory = "dspam";
+          LogsDirectoryMode = "0750";
+          # DSPAM segfaults on just about every error
+          Restart = "on-abort";
+          RestartSec = "1s";
+        };
+      };
+    }
+
+    (mkIf (cfg.maintenanceInterval != null) {
+      systemd.timers.dspam-maintenance = {
+        description = "Timer for dspam maintenance script";
+        wantedBy = [ "timers.target" ];
+        timerConfig = {
+          OnCalendar = cfg.maintenanceInterval;
+          Unit = "dspam-maintenance.service";
+        };
+      };
+
+      systemd.services.dspam-maintenance = {
+        description = "dspam maintenance script";
+        restartTriggers = [ cfgfile ];
+
+        serviceConfig = {
+          ExecStart = "${dspam}/bin/dspam_maintenance --verbose";
+          Type = "oneshot";
+          User = cfg.user;
+          Group = cfg.group;
+        };
+      };
+    })
+  ]);
+}