From 9c06fcf12fe712fd0dd03485a0bd2ef8a6ccffad Mon Sep 17 00:00:00 2001
From: Martin Pitt <martin.pitt@ubuntu.com>
Date: Tue, 15 Sep 2015 12:03:42 +0200
Subject: [PATCH] udev.postinst: Check that 50-virtio-kernel-names.link does
 not already exist

---
 debian/udev.postinst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/debian/udev.postinst b/debian/udev.postinst
index f66359691..f6b182d07 100644
--- a/debian/udev.postinst
+++ b/debian/udev.postinst
@@ -117,6 +117,7 @@ EOF
   # 226 introduced predictable interface names for virtio
   # (https://github.com/systemd/systemd/pull/1119); disable for upgrades
   if dpkg --compare-versions "$2" lt-nl "226-2~" &&
+      [ ! -e /etc/systemd/network/50-virtio-kernel-names.link ] &&
       ls -d /sys/bus/virtio/drivers/virtio_net/virt* >/dev/null 2>&1; then
     echo "virtio network devices detected, disabling predictable interface names in /etc/systemd/network/50-virtio-kernel-names.link"
     mkdir -p /etc/systemd/network/