From 71967c47e54c56557c0ee7bec7fe554c018e37c4 Mon Sep 17 00:00:00 2001
From: Leon Schuermann <leon@is.currently.online>
Date: Wed, 25 Sep 2024 01:51:22 -0400
Subject: [PATCH] nixos/syncoid: allow interval to be list of strings

The syncoid module generates systemd services with a `startAt` config
based on its `interval` value. However, it is currently not possible
to completely disable this timer, or set multiple `startAt` values.

By accepting the same types that `systemd.services.<name>.startAt`
accepts, we can disable generating a timer unit or set multiple
`startAt` timers.
---
 nixos/modules/services/backup/syncoid.nix | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/nixos/modules/services/backup/syncoid.nix b/nixos/modules/services/backup/syncoid.nix
index 0d379f6c915d..8b4c59155f4d 100644
--- a/nixos/modules/services/backup/syncoid.nix
+++ b/nixos/modules/services/backup/syncoid.nix
@@ -106,14 +106,17 @@ in
     package = lib.mkPackageOption pkgs "sanoid" { };
 
     interval = lib.mkOption {
-      type = lib.types.str;
+      type = with lib.types; either str (listOf str);
       default = "hourly";
       example = "*-*-* *:15:00";
       description = ''
         Run syncoid at this interval. The default is to run hourly.
 
-        The format is described in
-        {manpage}`systemd.time(7)`.
+        Must be in the format described in {manpage}`systemd.time(7)`.  This is
+        equivalent to adding a corresponding timer unit with
+        {option}`OnCalendar` set to the value given here.
+
+        Set to an empty list to avoid starting syncoid automatically.
       '';
     };