From 4dd28e782446cb5101be9cb1ce5eb3d4df4003e3 Mon Sep 17 00:00:00 2001
From: Michael Prokop <mika@grml.org>
Date: Fri, 24 May 2013 16:02:20 +0200
Subject: [PATCH] grml-sniff: make sure network devices configured as
 BRIDGE_DEVICES exist

---
 sbin/grml-sniff | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sbin/grml-sniff b/sbin/grml-sniff
index 3722c6a..cf41833 100755
--- a/sbin/grml-sniff
+++ b/sbin/grml-sniff
@@ -32,6 +32,17 @@ fi
 [ -n "$BRIDGE_NAME" ]    || BRIDGE_NAME='br0'
 [ -n "$BRIDGE_DEVICES" ] || BRIDGE_DEVICES='eth0 eth1'
 
+check_devs() {
+  for dev in $BRIDGE_DEVICES ; do
+    ip link show dev "$dev" >/dev/null 2>&1 || return 1
+ done
+}
+
+if ! check_devs ; then
+  eerror "BRIDGE_DEVICES $BRIDGE_DEVICES do not seem to exist." >&2
+  exit 1
+fi
+
 check4progs $BRCTL || exit 1
 
 case "$1" in
-- 
2.1.4