From bfbc0f354c837eb36e7f75b7f628a29536d66cfc Mon Sep 17 00:00:00 2001
From: Jason Ertel <jason.ertel@securityonionsolutions.com>
Date: Tue, 17 Nov 2020 22:48:40 -0500
Subject: [PATCH] Only default to logging out to tty if tty exists as a
 character device

---
 salt/common/tools/sbin/so-image-common | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/salt/common/tools/sbin/so-image-common b/salt/common/tools/sbin/so-image-common
index 165c20528..3449158c0 100755
--- a/salt/common/tools/sbin/so-image-common
+++ b/salt/common/tools/sbin/so-image-common
@@ -105,7 +105,11 @@ update_docker_containers() {
   fi
 
   if [ -z "$LOG_FILE" ]; then
-    LOG_FILE=/dev/tty
+    if [ -c /dev/tty ]; then
+      LOG_FILE=/dev/tty
+    else
+      LOG_FILE=/dev/null
+    fi
   fi
 
   # Recheck the version for scenarios were the VERSION wasn't known before this script was imported