From 6fc1dd9260bf13688702a649ecbb230327dc0964 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=8E=E5=BF=97=E9=94=8B10253908?=
 <li.zhifeng@zte.com.cn>
Date: Thu, 11 Mar 2021 18:10:37 +0800
Subject: [PATCH] Create the file when the file does not exist

---
 lumberjack.go      |  4 +++-
 lumberjack_test.go | 22 ++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/lumberjack.go b/lumberjack.go
index 3447cdc..6453297 100644
--- a/lumberjack.go
+++ b/lumberjack.go
@@ -143,7 +143,9 @@ func (l *Logger) Write(p []byte) (n int, err error) {
 		)
 	}
 
-	if l.file == nil {
+	//create file when 1)init 2)file does not exist
+	_, err = osStat(l.filename())
+	if l.file == nil || os.IsNotExist(err) {
 		if err = l.openExistingOrNew(len(p)); err != nil {
 			return 0, err
 		}
diff --git a/lumberjack_test.go b/lumberjack_test.go
index 484ee9d..4a68c38 100644
--- a/lumberjack_test.go
+++ b/lumberjack_test.go
@@ -74,6 +74,28 @@ func TestOpenExisting(t *testing.T) {
 	fileCount(dir, 1, t)
 }
 
+func TestOpenNotExisting(t *testing.T) {
+	currentTime = fakeTime
+	dir := makeTempDir("TestOpenNotExisting", t)
+	defer os.RemoveAll(dir)
+
+	filename := logFile(dir)
+	l := &Logger{
+		Filename: filename,
+	}
+	defer l.Close()
+	b := []byte("boo!")
+	n, err := l.Write(b)
+	isNil(err, t)
+	equals(len(b), n, t)
+
+	// make sure the file got appended
+	existsWithContent(filename, append(b), t)
+
+	// make sure no other files were created
+	fileCount(dir, 1, t)
+}
+
 func TestWriteTooLong(t *testing.T) {
 	currentTime = fakeTime
 	megabyte = 1