From fd5e1970e17a382d3120af04ff38cb44d1528ec0 Mon Sep 17 00:00:00 2001
From: Martynas Pumputis <martynasp@gmail.com>
Date: Wed, 14 Sep 2016 16:37:38 +0100
Subject: [PATCH] Return nil netdev if netns of container cannot be found

The change applies to GetNetDevsWithPredicate. The function calls
FindNetDevs which already does the same filtering.

The change prevents from "container-addrs" (weaveutil) returning
"unable to open X process namespace" error which happens when
a container dies while the cmd is being executed.
---
 common/utils.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/common/utils.go b/common/utils.go
index 51129500..25130ab2 100644
--- a/common/utils.go
+++ b/common/utils.go
@@ -132,6 +132,9 @@ func GetNetDevsWithPredicate(processID int, predicate func(link netlink.Link) bo
 	}
 	nsContainr, err := netns.GetFromPid(processID)
 	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
 		return nil, fmt.Errorf("unable to open process %d namespace: %s", processID, err)
 	}
 	if nsToplevel.Equal(nsContainr) {