From 2011d81f03e26c0a50d8a1836ddfe02c9cfaa441 Mon Sep 17 00:00:00 2001
From: Andrew Marshall <andrew@johnandrewmarshall.com>
Date: Fri, 22 Jul 2022 11:50:55 -0400
Subject: [PATCH] Fix error with strict_env
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With direnv’s `strict_env`, previously got an error

> NIX_BUILD_TOP: unbound variable

I tried to adjust the tests to catch this, but unfortunately I could not
get it to fail.
---
 direnvrc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/direnvrc b/direnvrc
index a25f24a..33c5c32 100644
--- a/direnvrc
+++ b/direnvrc
@@ -100,7 +100,7 @@ _nix_import_env() {
   # as it may be garbage collected.
   # Instead - just remove it immediately.
   # Use recursive & force as it may not be empty.
-  if [[ "$NIX_BUILD_TOP" == */nix-shell.* && -d "$NIX_BUILD_TOP" ]]; then
+  if [[ -n "${NIX_BUILD_TOP+x}" && "$NIX_BUILD_TOP" == */nix-shell.* && -d "$NIX_BUILD_TOP" ]]; then
     rm -rf "$NIX_BUILD_TOP"
   fi