From 1bed296c35afc2c5c4b969387a20f7a5778aecf7 Mon Sep 17 00:00:00 2001
From: Ben Vincent <ben@unkin.net>
Date: Thu, 2 Jul 2026 00:28:40 +1000
Subject: [PATCH] fix: let getenv honour an explicitly-empty env var

getenv fell back to the default whenever os.Getenv returned empty, so an
intentionally-empty override was impossible. Use os.LookupEnv to
distinguish unset from empty.

Refs #69
---
 internal/config/env.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/internal/config/env.go b/internal/config/env.go
index 633beba..6d33d2a 100644
--- a/internal/config/env.go
+++ b/internal/config/env.go
@@ -65,7 +65,7 @@ func Load() (*Config, error) {
 }
 
 func getenv(key, fallback string) string {
-	if v := os.Getenv(key); v != "" {
+	if v, ok := os.LookupEnv(key); ok {
 		return v
 	}
 	return fallback