From 320c58ce483f23da692106d8c4eddf3ac8756912 Mon Sep 17 00:00:00 2001
From: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
Date: Mon, 18 Sep 2023 13:57:41 +0200
Subject: [PATCH] Prevent the overlay to be mounted in stage1

---
 m/module/shared-nix-store.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/m/module/shared-nix-store.nix b/m/module/shared-nix-store.nix
index 72ece72..225bdc0 100644
--- a/m/module/shared-nix-store.nix
+++ b/m/module/shared-nix-store.nix
@@ -20,7 +20,9 @@
   # layer the disk nix store. The destination is still the nix store in
   # /nix/store (confusing). We need rw access, as the daemon need to write the
   # lock files to build derivations locally.
-  fileSystems."/nix/store" = {
+  # HACK: Use /nix//store to prevent the overlay to be mounted on boot, see:
+  # https://github.com/NixOS/nixpkgs/blob/17a46d09ac123d0da3a26855bf3af7db01f9c751/nixos/lib/utils.nix#L14
+  fileSystems."/nix//store" = {
     device = "overlay";
     fsType = "overlay";
     options = [ "lowerdir=/mnt/hut-nix-store,upperdir=/nix/store,workdir=/mnt/nix-work" ];