From 82a091e196a9a6cb132ca20aea16a3dc43971add Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Wed, 18 Apr 2018 14:47:59 +0200
Subject: rollingDirectories

---
 nix/module.nix | 43 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/nix/module.nix b/nix/module.nix
index c70d7e0..112d95e 100644
--- a/nix/module.nix
+++ b/nix/module.nix
@@ -1,7 +1,46 @@
-{ ... }:
+{ config, pkgs, lib, utils, ... }:
+
+with utils;
+with lib;
+
+let
+  dirConfig = {
+    options = {
+      path = mkOption {
+        type = types.path;
+      };
+
+      maxSize = mkOption {
+        type = with types; either ints.positive str;
+      };
+
+      monitorTimeout = mkOption {
+        type = with types; nullOr ints.positive;
+        default = 3600;
+      };
+    };
+  };
+
+  dirService = dCfg: with dCfg; nameValuePair ("rolling-directory@" + escapeSystemdPath path) {
+    wantedBy = [ "multi-user.target" ];
+
+    serviceConfig = {
+      ExecStart = let
+        args = [ path (toString maxSize) ] + optional (monitorTimeout != null) monitorTimeout;
+      in "${pkgs.rolling-directory}/bin/rolling-directory ${escapeShellArgs args}";
+    };
+  };
+in {
+  options = {
+    services.rollingDirectories = mkOption {
+      type = with types; listOf (submodule dirConfig);
+      default = [];
+    };
+  };
 
-{
   config = {
     nixpkgs.config.packageOverrides = import ./default.nix;
+
+    systemd.services = genAttrs config.rollingDirectories dirService;
   };
 }
-- 
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