From 8a63f8aac4211388c6bd709bfa7b3ca50265421e Mon Sep 17 00:00:00 2001
From: Simon Bruder <simon@sbruder.de>
Date: Sat, 5 Dec 2020 14:19:34 +0100
Subject: [PATCH] Parameterise restic

---
 machines/nunotaba/configuration.nix |  2 +-
 machines/sayuri/configuration.nix   |  2 +-
 modules/default.nix                 |  1 +
 modules/restic.nix                  | 74 +++++++++++++++++++----------
 4 files changed, 51 insertions(+), 28 deletions(-)

diff --git a/machines/nunotaba/configuration.nix b/machines/nunotaba/configuration.nix
index 19cac9b..a200422 100644
--- a/machines/nunotaba/configuration.nix
+++ b/machines/nunotaba/configuration.nix
@@ -6,7 +6,6 @@
       ./hardware-configuration.nix
       ../../modules/cpu/intel.nix
       ../../modules/gpu/intel.nix
-      ../../modules/restic.nix
       ../../modules/ssd.nix
       ../../modules/libvirt.nix
       ../../modules
@@ -16,6 +15,7 @@
 
   sbruder = {
     gui = true;
+    restic.enable = true;
   };
 
   boot.loader.grub.device = "/dev/disk/by-id/ata-INTEL_SSDSC2KB480G7_PHYS749202D6480BGN";
diff --git a/machines/sayuri/configuration.nix b/machines/sayuri/configuration.nix
index 7da6bf8..e4554a6 100644
--- a/machines/sayuri/configuration.nix
+++ b/machines/sayuri/configuration.nix
@@ -7,7 +7,6 @@
       ../../modules/cpu/intel.nix
       ../../modules/gpu/amd.nix
       ../../modules/libvirt.nix
-      ../../modules/restic.nix
       ../../modules/ssd.nix
       ../../modules
       ../../profiles/dev.nix
@@ -16,6 +15,7 @@
 
   sbruder = {
     gui = true;
+    restic.enable = true;
   };
 
   boot.loader.grub.device = "/dev/disk/by-id/ata-MTFDDAK256TBN-1AR15ABHA_UFZMQ01ZR50NMM";
diff --git a/modules/default.nix b/modules/default.nix
index 23df285..ea4f999 100644
--- a/modules/default.nix
+++ b/modules/default.nix
@@ -21,6 +21,7 @@
     ./office.nix
     ./prometheus/node_exporter.nix
     ./pulseaudio.nix
+    ./restic.nix
     ./ssh.nix
     ./sway.nix
     ./tools.nix
diff --git a/modules/restic.nix b/modules/restic.nix
index d46c46a..44c9b12 100644
--- a/modules/restic.nix
+++ b/modules/restic.nix
@@ -1,5 +1,7 @@
-{ pkgs, config, lib, ... }:
+{ pkgs, config, lib, options, ... }:
 let
+  cfg = config.sbruder.restic;
+
   name = "${config.networking.hostName}-system";
   excludes = [
     # General
@@ -44,32 +46,52 @@ let
   maybePath = path: (lib.optional (builtins.pathExists path) (toString path));
 in
 {
-  services.restic.backups."${name}" = {
-    passwordFile = toString (../secrets/restic_password);
-    s3CredentialsFile = toString ../secrets/s3_credentials;
-    repository = "s3:https://s3.eu-central-1.wasabisys.com/sbruder-restic";
-    paths = lib.mkDefault (
-      [ ]
-      ++ maybePath /data
-      ++ maybePath /home
-      ++ maybePath /srv
-      ++ maybePath /var
-    );
-    initialize = true;
-    extraBackupArgs = [
-      "--exclude-caches"
-      "--exclude-file=${excludesFile}"
-      "--verbose"
-    ];
-    timerConfig = {
-      OnCalendar = "20:00";
-      RandomizedDelaySec = "2h";
-    };
+  options.sbruder.restic = {
+    enable = lib.mkEnableOption "restic";
+    timerConfig =
+      lib.recursiveUpdate
+        (
+          (builtins.elemAt
+            (builtins.elemAt
+              options.services.restic.backups.type.getSubModules
+              0
+            ).imports
+            0)
+            { name = ""; }
+        ).options.timerConfig
+        {
+          default = {
+            OnCalendar = "20:00";
+            RandomizedDelaySec = "2h";
+          };
+        };
   };
 
-  systemd.services."restic-backups-${name}".serviceConfig = {
-    "Nice" = 10;
-    "IOSchedulingClass" = "best-effort";
-    "IOSchedulingPriority" = 7;
+  config = lib.mkIf cfg.enable {
+    services.restic.backups."${name}" = {
+      passwordFile = toString (../secrets/restic_password);
+      s3CredentialsFile = toString ../secrets/s3_credentials;
+      repository = "s3:https://s3.eu-central-1.wasabisys.com/sbruder-restic";
+      paths = lib.mkDefault (
+        [ ]
+        ++ maybePath /data
+        ++ maybePath /home
+        ++ maybePath /srv
+        ++ maybePath /var
+      );
+      initialize = true;
+      extraBackupArgs = [
+        "--exclude-caches"
+        "--exclude-file=${excludesFile}"
+        "--verbose"
+      ];
+      timerConfig = cfg.timerConfig;
+    };
+
+    systemd.services."restic-backups-${name}".serviceConfig = {
+      "Nice" = 10;
+      "IOSchedulingClass" = "best-effort";
+      "IOSchedulingPriority" = 7;
+    };
   };
 }