From 0463d5e36ffdbb60f851bd3b34756eff84151b28 Mon Sep 17 00:00:00 2001
From: Matthew Bauer <mjbauer95@gmail.com>
Date: Thu, 22 Aug 2019 23:38:52 -0400
Subject: [PATCH] Allow empty /nix directory in multi-user installer

With macOS catalina, we can no longer modify the root system
volume (#2925). macOS provides a system configuration file in
synthetic.conf(5) to create empty root directories. This can be used
to mount /nix to a separate volume. As a result, this directory will
need to already exist prior to installation. Instead, check for
/nix/store and /nix/var for a live Nix installation.
---
 scripts/install-multi-user.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/install-multi-user.sh b/scripts/install-multi-user.sh
index 9b757e7d..3d8b035e 100644
--- a/scripts/install-multi-user.sh
+++ b/scripts/install-multi-user.sh
@@ -330,7 +330,7 @@ EOF
         fi
     done
 
-    if [ -d /nix ]; then
+    if [ -d /nix/store ] || [ -d /nix/var ]; then
         failure <<EOF
 There are some relics of a previous installation of Nix at /nix, and
 this scripts assumes Nix is _not_ yet installed. Please delete the old