From b895147fdc2e5076fec114c0aba570be8fa86cab Mon Sep 17 00:00:00 2001
From: JongHyok Lee <wingsof@gmail.com>
Date: Fri, 22 Jun 2018 09:55:54 +0900
Subject: [PATCH] Added path tag to tail input plugin (#4292)

---
 plugins/inputs/tail/tail.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/plugins/inputs/tail/tail.go b/plugins/inputs/tail/tail.go
index 86534da5f..0de2a344c 100644
--- a/plugins/inputs/tail/tail.go
+++ b/plugins/inputs/tail/tail.go
@@ -146,7 +146,11 @@ func (t *Tail) receiver(tailer *tail.Tail) {
 
 		m, err = t.parser.ParseLine(text)
 		if err == nil {
-			t.acc.AddFields(m.Name(), m.Fields(), m.Tags(), m.Time())
+			if m != nil {
+				tags := m.Tags()
+				tags["path"] = tailer.Filename
+				t.acc.AddFields(m.Name(), m.Fields(), tags, m.Time())
+			}
 		} else {
 			t.acc.AddError(fmt.Errorf("E! Malformed log line in %s: [%s], Error: %s\n",
 				tailer.Filename, line.Text, err))