From c9d23c27ffb3a1b0e161d6b44cf28741ac1c195a Mon Sep 17 00:00:00 2001
From: NAHO <90870942+trueNAHO@users.noreply.github.com>
Date: Wed, 21 Feb 2024 18:20:18 +0100
Subject: [PATCH] fix(modules/nixos/services/btrbk): ensure the snapshot
 directory exists

---
 hosts/bluetop/default.nix                |  6 ++++-
 hosts/masterplan/default.nix             |  6 ++++-
 modules/nixos/services/btrbk/default.nix | 33 +++++++++++++++++-------
 3 files changed, 33 insertions(+), 12 deletions(-)

diff --git a/hosts/bluetop/default.nix b/hosts/bluetop/default.nix
index 0f0649f..7f13e2f 100644
--- a/hosts/bluetop/default.nix
+++ b/hosts/bluetop/default.nix
@@ -68,7 +68,11 @@
                 repo = "/mnt/borgbackup";
               };
 
-              btrbk.enable = true;
+              btrbk = {
+                enable = true;
+                snapshotDir = "/nix/btrbk";
+              };
+
               openssh.enable = true;
             };
 
diff --git a/hosts/masterplan/default.nix b/hosts/masterplan/default.nix
index ebef7d6..b5f1339 100644
--- a/hosts/masterplan/default.nix
+++ b/hosts/masterplan/default.nix
@@ -69,7 +69,11 @@
                 repo = "/mnt/borgbackup";
               };
 
-              btrbk.enable = true;
+              btrbk = {
+                enable = true;
+                snapshotDir = "/nix/btrbk";
+              };
+
               openssh.enable = true;
             };
 
diff --git a/modules/nixos/services/btrbk/default.nix b/modules/nixos/services/btrbk/default.nix
index 7fc3912..009443b 100644
--- a/modules/nixos/services/btrbk/default.nix
+++ b/modules/nixos/services/btrbk/default.nix
@@ -3,18 +3,31 @@
   lib,
   ...
 }: {
-  options.modules.nixos.services.btrbk.enable = lib.mkEnableOption "btrbk";
+  options.modules.nixos.services.btrbk = {
+    enable = lib.mkEnableOption "btrbk";
 
-  config = lib.mkIf config.modules.nixos.services.btrbk.enable {
-    services.btrbk.instances.home = {
-      onCalendar = "hourly";
+    snapshotDir = lib.mkOption {
+      description = "Path to Btrbk's snapshot directory.";
+      example = "/nix/btrbk";
+      type = lib.types.str;
+    };
+  };
+
+  config = let
+    cfg = config.modules.nixos.services.btrbk;
+  in
+    lib.mkIf cfg.enable {
+      services.btrbk.instances.home = {
+        onCalendar = "hourly";
 
-      settings = {
-        snapshot_dir = "/nix/btrbk";
-        snapshot_preserve = "7d 5w";
-        snapshot_preserve_min = "2d";
-        subvolume = "/home";
+        settings = {
+          snapshot_dir = cfg.snapshotDir;
+          snapshot_preserve = "7d 5w";
+          snapshot_preserve_min = "2d";
+          subvolume = "/home";
+        };
       };
+
+      systemd.tmpfiles.rules = ["d ${cfg.snapshotDir} 700"];
     };
-  };
 }