From 296b62acb7b59e5dc1fa66f21cb52876d326e2f0 Mon Sep 17 00:00:00 2001
From: Matt Layher <mdlayher@gmail.com>
Date: Tue, 31 Oct 2017 15:26:32 -0400
Subject: [PATCH] netstat: return nothing when /proc/net/snmp6 not found

---
 collector/netstat_linux.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/collector/netstat_linux.go b/collector/netstat_linux.go
index f16c8cf6..a7e7ac93 100644
--- a/collector/netstat_linux.go
+++ b/collector/netstat_linux.go
@@ -121,6 +121,12 @@ func parseNetStats(r io.Reader, fileName string) (map[string]map[string]string,
 func getSNMP6Stats(fileName string) (map[string]map[string]string, error) {
 	file, err := os.Open(fileName)
 	if err != nil {
+		// On systems with IPv6 disabled, this file won't exist.
+		// Do nothing.
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+
 		return nil, err
 	}
 	defer file.Close()