From 1160e6e6b8f6268aa4f91f94bab5727933aa7a05 Mon Sep 17 00:00:00 2001
From: Marc Finet <marc@rtone.fr>
Date: Tue, 7 Mar 2023 13:26:04 +0100
Subject: [PATCH] export: avoid error on unbound variable

I the shell has `set -u` (to abort on unbound variable), sourcing
export.sh currently fails when IDF_EXPORT_QUIET or IDF_PATH is not set:
> /path/to/esp-idf/export.sh:16: IDF_EXPORT_QUIET: unbound variable

This commit sets a default empty value to those variable, as done
in 16731833fb5 (which forgot IDF_PATH as it's usually set, the other
variable landed later in the file).
---
 export.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/export.sh b/export.sh
index 2db9f123e4..89487be237 100644
--- a/export.sh
+++ b/export.sh
@@ -13,7 +13,7 @@ __realpath() {
 
 
 __verbose() {
-    [ -n "${IDF_EXPORT_QUIET}" ] && return
+    [ -n "${IDF_EXPORT_QUIET-}" ] && return
     echo "$@"
 }
 
@@ -72,7 +72,7 @@ __main() {
     # Since sh or dash shells can't detect script_dir correctly, check if script_dir looks like an IDF directory
     is_script_dir_esp_idf=$(__is_dir_esp_idf "${script_dir}")
 
-    if [ -z "${IDF_PATH}" ]
+    if [ -z "${IDF_PATH-}" ]
     then
         # IDF_PATH not set in the environment.