From 58841b42a763e223e249655ea4f97b1c7345c7f4 Mon Sep 17 00:00:00 2001
From: 1000TurquoisePogs <sgrady@rocketsoftware.com>
Date: Wed, 22 Feb 2023 11:43:15 -0500
Subject: [PATCH] Update app-server.sh

Support earlier node 14s by doing a flag compatibility check on dns-result-order

Signed-off-by: 1000TurquoisePogs <sgrady@rocketsoftware.com>
---
 bin/app-server.sh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/bin/app-server.sh b/bin/app-server.sh
index 9482b88..eccb81f 100755
--- a/bin/app-server.sh
+++ b/bin/app-server.sh
@@ -91,11 +91,18 @@ else
   ZLUX_SERVER_FILE=zluxServer.js
 fi
 
+# Tells node whether to prefer ipv4 or ipv6 results to DNS lookups
 ZLUX_DNS_ORDER="--dns-result-order=ipv4first"
 if [ "$ZWE_components_app_server_dns_lookupOrder" = "ipv6" ]; then
   ZLUX_DNS_ORDER="--dns-result-order=verbatim"
 fi
 
+# not all versions of node support the above (14.18+ generally) so we can just try it to see what happens.
+v4_check=$(${NODE_BIN} ${ZLUX_DNS_ORDER} -e "console.log('success');")
+if [ "${v4_check}" != "success" ]; then
+  ZLUX_DNS_ORDER=
+fi
+
 if [ -z "$ZLUX_NO_LOGFILE" ]; then
     __UNTAGGED_READ_MODE=V6 \
     _BPX_JOBNAME=${ZOWE_PREFIX}DS \