1 files changed, 6 insertions, 3 deletions
diff --git a/lib/common.sh b/lib/common.sh
index dbacebf..455eb03 100644
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -1,10 +1,13 @@
+#!/hint/bash
+# This may be included with or without `set -euE`
+
 # Avoid any encoding problems
 export LANG=C
 
 shopt -s extglob
 
 # check if messages are to be printed using color
-unset ALL_OFF BOLD BLUE GREEN RED YELLOW
+declare ALL_OFF= BOLD= BLUE= GREEN= RED= YELLOW=
 if [[ -t 2 ]]; then
 	# prefer terminal safe colored and bold text when tput is supported
 	if tput setaf 0 &>/dev/null; then
@@ -61,14 +64,14 @@ stat_done() {
 
 _setup_workdir=false
 setup_workdir() {
-	[[ -z $WORKDIR ]] && WORKDIR=$(mktemp -d --tmpdir "${0##*/}.XXXXXXXXXX")
+	[[ -z ${WORKDIR:-} ]] && WORKDIR=$(mktemp -d --tmpdir "${0##*/}.XXXXXXXXXX")
 	_setup_workdir=true
 	trap 'trap_abort' INT QUIT TERM HUP
 	trap 'trap_exit' EXIT
 }
 
 cleanup() {
-	if [[ -n $WORKDIR ]] && $_setup_workdir; then
+	if [[ -n ${WORKDIR:-} ]] && $_setup_workdir; then
 		rm -rf "$WORKDIR"
 	fi
 	exit ${1:-0}