From 9a5b7e2fc43627a09d1d36bd2565dec9319eca52 Mon Sep 17 00:00:00 2001
From: Josh McSavaney <mcsaucy@csh.rit.edu>
Date: Tue, 30 Jun 2020 12:45:01 -0400
Subject: [PATCH] Pattern match for https check instead of grep

Signed-off-by: Josh McSavaney <mcsaucy@csh.rit.edu>
---
 install.sh | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/install.sh b/install.sh
index 6b6c664e8d5..a55539f48c4 100755
--- a/install.sh
+++ b/install.sh
@@ -153,9 +153,14 @@ setup_env() {
                 if [ -z "${K3S_TOKEN}" ] && [ -z "${K3S_CLUSTER_SECRET}" ]; then
                     fatal "Defaulted k3s exec command to 'agent' because K3S_URL is defined, but K3S_TOKEN or K3S_CLUSTER_SECRET is not defined."
                 fi
-                if ! echo "${K3S_URL}" | grep -q "^https://"; then
-                    fatal "Only https:// URLs are supported for K3S_URL (have ${K3S_URL})"
-                fi
+
+                case "${K3S_URL}" in
+                    https://*)
+                        ;;
+                    *)
+                        fatal "Only https:// URLs are supported for K3S_URL (have ${K3S_URL})"
+                        ;;
+                esac
                 CMD_K3S=agent
             fi
         ;;