From 44d1c8dc3aef0186bf6934fd1307133703f7916f Mon Sep 17 00:00:00 2001
From: Lars Kruse <devel@sumpfralle.de>
Date: Sat, 8 Feb 2020 22:47:02 +0100
Subject: [PATCH] Plugin if_: do not expose errors from ethtool

ethtool prints the error message "Cannot get device settings: No such
device" for VLAN devices.  This error message should not be exposed via
the munin protocol.
---
 plugins/if_ | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/if_ b/plugins/if_
index 11b80c9..dc6b379 100644
--- a/plugins/if_
+++ b/plugins/if_
@@ -16,7 +16,7 @@ config_if() {
   echo "up.min 0"
   echo "up.negative down"
   echo "up.cdef up,8,*"
-  if [ -n "$(which ethtool)" ] && [ -x "$(which ethtool)" ] && ethtool "$INTERFACE" | grep -q Speed; then
+  if [ -n "$(which ethtool)" ] && [ -x "$(which ethtool)" ] && ethtool "$INTERFACE" 2>/dev/null | grep -q Speed; then
     MAX=$(($(ethtool "$INTERFACE" | grep Speed | sed -e 's/[[:space:]]\{1,\}/ /g' -e 's/^ //' -e 's/M.*//' | cut -d " " -f 2) * 1000000))
     echo "up.max $MAX"
     echo "down.max $MAX"