From a30a7fa1b358358b7c7365b64c59a5daebbd84e3 Mon Sep 17 00:00:00 2001
From: Nick Novitski <github@nicknovitski.com>
Date: Wed, 18 Oct 2023 22:09:38 -0700
Subject: [PATCH] feat: Don't add empty or already-set variables

---
 nix-develop-gha.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/nix-develop-gha.sh b/nix-develop-gha.sh
index 891a445..3e6950e 100755
--- a/nix-develop-gha.sh
+++ b/nix-develop-gha.sh
@@ -18,6 +18,11 @@ while IFS='=' read -r -d '' n v; do
 	if [ "$n" == "PATH" ]; then
 		continue
 	fi
+	# Skip if the variable is already in the environment with the same
+	# value (treating unset and the empty string as identical states)
+	if [ "${!n:-}" == "$v" ]; then
+		continue
+	fi
 	if (("$(wc -l <<<"$v")" > 1)); then
 		delimiter=$(openssl rand -base64 18)
 		if contains "$delimiter" "$v"; then