From 6ea0c51a0898253c89775727df4f3814c64bc877 Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@tuebingen.mpg.de>
Date: Thu, 28 Jul 2016 13:56:05 +0200
Subject: [PATCH] gsu_make_tempfile(): Avoid reading an unbound variable.

If a gsu script

	(a) enables the -u option to treat unset variables as
	    an error for parameter expansion,
	(b) does not set TMPDIR,
	(c) calls gsu_make_tempfile(),

gsu_make_tempfile() fails with an "TMPDIR: unbound variable" error.

The code already contains a fallback for this case, so we can use
the :- construct to avoid the error and fall back to /tmp if TMPDIR
is unset or NULL.
---
 common | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common b/common
index 4e1d115..ec7b8e2 100644
--- a/common
+++ b/common
@@ -107,7 +107,7 @@ gsu_make_tempfile()
 	if [[ "${template:0:1}" != '/' ]]; then # relative path
 		if (($# > 1)); then
 			dir="$2"
-		elif [[ -n "$TMPDIR" ]]; then
+		elif [[ -n "${TMPDIR:-}" ]]; then
 			dir="$TMPDIR"
 		else
 			dir="/tmp"
-- 
2.39.5