From de89e70a05bcc83172e60f502260377502b305d3 Mon Sep 17 00:00:00 2001
From: Simon Gardling <titaniumtown@proton.me>
Date: Tue, 13 Jan 2026 13:13:49 -0500
Subject: [PATCH] impermanence: fix /etc/zfs cache

---
 modules/impermanence.nix | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/modules/impermanence.nix b/modules/impermanence.nix
index 6d78b55..5849d47 100644
--- a/modules/impermanence.nix
+++ b/modules/impermanence.nix
@@ -20,14 +20,15 @@
       "/var/lib/nixos"
 
       "/var/lib/systemd/timers"
+
+      # ZFS cache directory - persisting the directory instead of the file
+      # avoids "device busy" errors when ZFS atomically updates the cache
+      "/etc/zfs"
     ];
 
     files = [
       # Machine ID
       "/etc/machine-id"
-
-      # ZFS cache
-      "/etc/zfs/zpool.cache"
     ];
 
     users.${username} = {