From f74c0f26e887467f1edd3bda5f03da3786180eb3 Mon Sep 17 00:00:00 2001
From: Alejandro Soto <alejandro@34project.org>
Date: Mon, 8 Aug 2022 04:30:53 -0600
Subject: sys/fs: add single layout assertion

---
 sys/fs/layout.nix | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'sys')

diff --git a/sys/fs/layout.nix b/sys/fs/layout.nix
index 999492d..897cffe 100644
--- a/sys/fs/layout.nix
+++ b/sys/fs/layout.nix
@@ -73,5 +73,12 @@ in {
       layoutOpts = [ layout.sysHddBtrfs ];
       valid = filter ({ snd, ... }: snd != null) (zipLists layoutMaps layoutOpts);
     in optionalAttrs (valid != []) ((head valid).fst (head valid).snd);
+
+    assertions = [
+      {
+        assertion = length (filter (layout: layout != null) (attrValues cfg.fs.layout)) <= 1;
+        message = "Cannot enable more than one filesystem layout";
+      }
+    ];
   };
 }
-- 
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