From 428baed6cf2edcc9b8786e71bf708ed026b79d32 Mon Sep 17 00:00:00 2001
From: Christopher Bacher <mindsbackyard@gmail.com>
Date: Fri, 28 Oct 2022 18:51:18 +0200
Subject: [PATCH] flake(linger): add linger-flaker to allow the pihole-flake to
 manage user lingering

Systemd's user lingering feature seems to be necessary to run rootless podman if the executing user is not logged in.
See https://github.com/NixOS/nixpkgs/issues/138423
---
 flake.nix                            | 10 ++++++++--
 modules/pihole-container.factory.nix |  7 ++++++-
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/flake.nix b/flake.nix
index 2b3fbcc..c425d5e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -5,9 +5,11 @@
     nixpkgs.url = "nixpkgs/nixpkgs-unstable";
 
     flake-utils.url = "github:numtide/flake-utils";
+
+    linger.url = "github:mindsbackyard/linger-flake";
   };
 
-  outputs = { self, nixpkgs, flake-utils }: with flake-utils.lib; eachSystem (with system; [ x86_64-linux aarch64-linux ]) (curSystem:
+  outputs = { self, nixpkgs, flake-utils, linger }: with flake-utils.lib; eachSystem (with system; [ x86_64-linux aarch64-linux ]) (curSystem:
     let
       util = import ./lib/util.nix;
       pkgs = nixpkgs.legacyPackages.${curSystem};
@@ -34,7 +36,11 @@
         default = piholeImage;
       };
 
-      nixosModules.default = (import ./modules/pihole-container.factory.nix) { piholeFlake = self; inherit util; };
+      nixosModules.default = (import ./modules/pihole-container.factory.nix) {
+        piholeFlake = self;
+        lingerFlake = linger;
+        inherit util;
+      };
 
       devShells.default = let
         updatePiholeImageInfoScript = pkgs.writeShellScriptBin "update-pihole-image-info" ''
diff --git a/modules/pihole-container.factory.nix b/modules/pihole-container.factory.nix
index 1de525c..dbac385 100644
--- a/modules/pihole-container.factory.nix
+++ b/modules/pihole-container.factory.nix
@@ -1,4 +1,4 @@
-{ piholeFlake, util }: { config, pkgs, lib, ... }: with lib; with builtins; let
+{ piholeFlake, lingerFlake, util }: { config, pkgs, lib, ... }: with lib; with builtins; let
   inherit (util) collectAttrFragments accessValueOfFragment toEnvValue;
 
   cfg = config.services.pihole;
@@ -320,6 +320,11 @@ in rec {
       Set it to "suppressWarning" if you manage lingering in a different way.
     '');
 
+    services.linger = mkIf (cfg.hostConfig.enableLingeringForUser == true) {
+      enable = true;
+      users = [ cfg.hostConfig.user ];
+    };
+
     systemd.services."pihole-rootless-container" = {
       wantedBy = [ "multi-user.target" ];
       after = [ "network-online.target" ];