tmpfiles: add module

PR #1144

.github/CODEOWNERS

@@ -18,6 +18,8 @@
 
 /modules/misc/submodule-support.nix                   @rycee
 
+/modules/misc/tmpfiles.nix                            @dawidsowa
+
 /modules/misc/xdg-mime-apps.nix                       @pacien
 
 /modules/misc/xdg-user-dirs.nix                       @pacien

modules/misc/tmpfiles.nix

@@ -0,0 +1,49 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.systemd.user.tmpfiles;
+
+in {
+  meta.maintainers = [ maintainers.dawidsowa ];
+
+  options.systemd.user.tmpfiles.rules = mkOption {
+    type = types.listOf types.str;
+    default = [ ];
+    example = [ "L /home/user/Documents - - - - /mnt/data/Documents" ];
+    description = ''
+      Rules for creating and cleaning up temporary files
+      automatically. See
+      <citerefentry>
+        <refentrytitle>tmpfiles.d</refentrytitle>
+        <manvolnum>5</manvolnum>
+      </citerefentry>
+      for the exact format.
+    '';
+  };
+
+  config = mkIf (cfg.rules != [ ]) {
+    xdg = {
+      dataFile."user-tmpfiles.d/home-manager.conf" = {
+        text = ''
+          # This file is created automatically and should not be modified.
+          # Please change the option ‘systemd.user.tmpfiles.rules’ instead.
+          ${concatStringsSep "\n" cfg.rules}
+        '';
+        onChange = "${pkgs.systemd}/bin/systemd-tmpfiles --user --create";
+      };
+      configFile = {
+        "systemd/user/basic.target.wants/systemd-tmpfiles-setup.service".source =
+          "${pkgs.systemd}/example/systemd/user/systemd-tmpfiles-setup.service";
+        "systemd/user/systemd-tmpfiles-setup.service".source =
+          "${pkgs.systemd}/example/systemd/user/systemd-tmpfiles-setup.service";
+        "systemd/user/timers.target.wants/systemd-tmpfiles-clean.timer".source =
+          "${pkgs.systemd}/example/systemd/user/systemd-tmpfiles-clean.timer";
+        "systemd/user/systemd-tmpfiles-clean.service".source =
+          "${pkgs.systemd}/example/systemd/user/systemd-tmpfiles-clean.service";
+      };
+    };
+  };
+}

modules/modules.nix

@@ -36,6 +36,7 @@ let
     (loadModule ./misc/pam.nix { })
     (loadModule ./misc/qt.nix { })
     (loadModule ./misc/submodule-support.nix { })
+    (loadModule ./misc/tmpfiles.nix { condition = hostPlatform.isLinux; })
     (loadModule ./misc/version.nix { })
     (loadModule ./misc/xdg-mime.nix { condition = hostPlatform.isLinux; })
     (loadModule ./misc/xdg-mime-apps.nix { condition = hostPlatform.isLinux; })