From bb819d5ef6c6dc68da524de07991eae2a2c3a3af Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Fri, 15 Apr 2016 17:37:46 -0400
Subject: Use a better technique for dealing with empty arrays when `set -u`.

https://news.ycombinator.com/item?id=11497636
---
 src/chroot-tools/librechroot | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

(limited to 'src/chroot-tools')

diff --git a/src/chroot-tools/librechroot b/src/chroot-tools/librechroot
index 5ff9c99..ba722c7 100755
--- a/src/chroot-tools/librechroot
+++ b/src/chroot-tools/librechroot
@@ -54,18 +54,22 @@ arch-nspawn() {
 	local copydir=$1; shift
 	local cmd=("$@")
 
-	set +u # if an array is empty, it counts as unbound
-	"$_arch_nspawn" "${arch_nspawn_flags[@]}" "$copydir" "${sysd_nspawn_flags[@]}" -- "${cmd[@]}"
-	set -u
+	"$_arch_nspawn" \
+	    ${arch_nspawn_flags+"${arch_nspawn_flags[@]}"} \
+	    "$copydir" \
+	    ${sysd_nspawn_flags+"${sysd_nspawn_flags[@]}"} \
+	    -- \
+	    "${cmd[@]}"
 }
 
 # Usage: mkarchroot $copydir $pkgs...
 mkarchroot() {
 	local copydir=$1; shift
 	local pkgs=("$@")
-	set +u # if an array is empty, it counts as unbound
-	"$_mkarchroot" "${arch_nspawn_flags[@]}" "$copydir" "${pkgs[@]}"
-	set -u
+	"$_mkarchroot" \
+	    ${arch_nspawn_flags+"${arch_nspawn_flags[@]}"} \
+	    "$copydir" \
+	    "${pkgs[@]}"
 }
 
 # Usage: _makechrootpkg $function $arguments...
-- 
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