From 80462688936ae4bb726c7065fbfb6ac289a361e9 Mon Sep 17 00:00:00 2001
From: Lars Kruse <devel@sumpfralle.de>
Date: Sat, 22 Aug 2020 20:26:27 +0200
Subject: [PATCH] if_: handle "Unknown" emitted by ethtool

Previously error messages were emitted due to this non-numeric value.

Closes: #3
---
 plugins/if_ | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/plugins/if_ b/plugins/if_
index dc6b379..d2b5460 100644
--- a/plugins/if_
+++ b/plugins/if_
@@ -16,10 +16,12 @@ config_if() {
   echo "up.min 0"
   echo "up.negative down"
   echo "up.cdef up,8,*"
-  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 $MAX"
+  if [ -n "$(which ethtool)" ] && [ -x "$(which ethtool)" ]; then
+    MAX_MBPS=$(ethtool "$INTERFACE" 2>/dev/null | grep "Speed: [0-9]\+Mb/s$" | sed 's/[^0-9]//g')
+    if [ -n "$MAX_MBPS" ]; then
+      echo "up.max $((MAX_MBPS * 1024 * 1024))"
+      echo "down.max $((MAX_MBPS * 1024 * 1024))"
+    fi
   fi
 }
 fetch_if() {