Update mqtt-install.sh

setup/mqtt-install.sh

@@ -1,6 +1,4 @@
-#!/usr/bin/env bash -ex
-set -euo pipefail
-shopt -s inherit_errexit nullglob
+#!/usr/bin/env bash
 YW=`echo "\033[33m"`
 RD=`echo "\033[01;31m"`
 BL=`echo "\033[36m"`
@@ -13,6 +11,22 @@ CM="${GN}✓${CL}"
 CROSS="${RD}✗${CL}"
 BFR="\\r\\033[K"
 HOLD="-"
+set -o errexit
+set -o errtrace
+set -o nounset
+set -o pipefail
+shopt -s expand_aliases
+alias die='EXIT=$? LINE=$LINENO error_exit'
+trap die ERR
+
+function error_exit() {
+  trap - ERR
+  local reason="Unknown failure occured."
+  local msg="${1:-$reason}"
+  local flag="${RD}‼ ERROR ${CL}$EXIT@$LINE"
+  echo -e "$flag $msg" 1>&2
+  exit $EXIT
+}
 
 function msg_info() {
     local msg="$1"