File vif-bridge-tap-fix.patch of Package xen.12874

# HG changeset patch
# User Jim Fehlig <jfehlig@suse.com>
# Date 1319581952 21600
# Node ID 74da2a3a1db1476d627f42e4a99e9e720cc6774d
# Parent  6c583d35d76dda2236c81d9437ff9d57ab02c006
Prevent vif-bridge from adding user-created tap interfaces to a bridge

Exit vif-bridge script if there is no device info in xenstore, preventing
it from adding user-created taps to bridges.

    Signed-off-by: Jim Fehlig <jfehlig@suse.com>

Index: xen-4.5.0-testing/tools/hotplug/Linux/vif-bridge
===================================================================
--- xen-4.5.0-testing.orig/tools/hotplug/Linux/vif-bridge
+++ xen-4.5.0-testing/tools/hotplug/Linux/vif-bridge
@@ -28,6 +28,13 @@
 dir=$(dirname "$0")
 . "$dir/vif-common.sh"
 
+mac=$(xenstore_read_default "$XENBUS_PATH/mac" "")
+if [ -z "$mac" ]
+then
+    log debug "No device details in $XENBUS_PATH, exiting."
+    exit 0
+fi
+
 bridge=${bridge:-}
 bridge=$(xenstore_read_default "$XENBUS_PATH/bridge" "$bridge")