From af982a9f646967e1117c1778ca8e30aa06b76c5b Mon Sep 17 00:00:00 2001
From: Nikolaos Karaolidis <nick@karaolidis.com>
Date: Mon, 29 Jul 2024 22:59:56 +0100
Subject: [PATCH] Add syncthing systemd dependencies

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>
---
 .../configs/console/syncthing/default.nix     | 55 +++++++++++++++----
 1 file changed, 44 insertions(+), 11 deletions(-)

diff --git a/hosts/common/user/configs/console/syncthing/default.nix b/hosts/common/user/configs/console/syncthing/default.nix
index ee7867d..3144a00 100644
--- a/hosts/common/user/configs/console/syncthing/default.nix
+++ b/hosts/common/user/configs/console/syncthing/default.nix
@@ -1,7 +1,17 @@
 {
   username ? throw "username argument is required",
 }:
-{ config, ... }:
+{
+  config,
+  inputs,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  userConfig = config.users.users.${username};
+  hmConfig = config.home-manager.users.${username};
+in
 {
   networking.firewall = {
     allowedTCPPorts = [ 22000 ];
@@ -24,18 +34,41 @@
     };
   };
 
-  home-manager.users.${username}.services.syncthing = {
-    enable = true;
-    key = config.sops.secrets."syncthing/key".path;
-    cert = config.sops.secrets."syncthing/cert".path;
-    extraOptions = [ "-no-default-folder" ];
+  home-manager.users.${username} = {
+    services.syncthing = {
+      enable = true;
+      key = config.sops.secrets."syncthing/key".path;
+      cert = config.sops.secrets."syncthing/cert".path;
+      extraOptions = [ "-no-default-folder" ];
 
-    settings = {
-      options.urAccepted = -1;
-      devices = {
-        amalthea.id = "2W7YT6Q-TO7CYMW-JH6QZXE-7Q6MDQQ-HPHKP4A-VI5HP7G-KLMGMST-MNRYHQG"; # Google Pixel 8 Pro
-        ganymede.id = "DXJPEJA-JNGF6I4-VIZYTX7-U345C5V-HIUTSFC-D36N2EM-Y3FAKJM-PRKYQAI"; # Samsung Galaxy Tab S7+
+      settings = {
+        options.urAccepted = -1;
+        devices = {
+          amalthea.id = "2W7YT6Q-TO7CYMW-JH6QZXE-7Q6MDQQ-HPHKP4A-VI5HP7G-KLMGMST-MNRYHQG"; # Google Pixel 8 Pro
+          ganymede.id = "DXJPEJA-JNGF6I4-VIZYTX7-U345C5V-HIUTSFC-D36N2EM-Y3FAKJM-PRKYQAI"; # Samsung Galaxy Tab S7+
+        };
       };
     };
+
+    systemd.user.services.syncthing.Unit.After =
+      let
+        inherit (pkgs.callPackage "${inputs.impermanence}/lib.nix" { }) mkServiceName parentsOf;
+        removeHomePrefix =
+          path: lib.strings.removePrefix "~/" (lib.strings.removePrefix "${userConfig.home}/" path);
+        syncthingFolders = builtins.map (folder: removeHomePrefix folder.path) (
+          builtins.attrValues hmConfig.services.syncthing.settings.folders
+        );
+      in
+      lib.lists.flatten (
+        builtins.map (
+          persistence:
+          builtins.map (folder: "${mkServiceName persistence.persistentStoragePath folder}.service") (
+            builtins.filter (folder: builtins.elem folder persistence.directories) (
+              lib.lists.unique (lib.lists.flatten (builtins.map parentsOf syncthingFolders))
+            )
+          )
+        ) (builtins.attrValues hmConfig.home.persistence)
+      )
+      ++ [ "sops-nix.service" ];
   };
 }