check if user is root or in docker group

template-update.sh

@@ -15,6 +15,13 @@ if ! command -v wget > /dev/null 2>&1; then
     exit 1
 fi
 
+# is user root or in the docker group?
+if [ ! "$( id -u )" -eq 0 ]; then
+    if ! id -Gn | grep docker > /dev/null; then
+        consoleError '1' "You must either be root or in the 'docker' group to run this script since you must be able to run 'docker exec' commands against the container!"
+    fi
+fi
+
 # zero counters
 updatesAvailable=0
 downloadFailed=0