From 15be5e8700efc0dda7c8ff5c334bca619e504728 Mon Sep 17 00:00:00 2001
From: Daniel Einspanjer <deinspanjer@gmail.com>
Date: Tue, 31 Jul 2018 18:32:14 -0400
Subject: [PATCH] Fix for #549 Add O_CREATE flag to the non-force branch of
 writeConfig Also add test for the method

---
 viper.go      |  2 +-
 viper_test.go | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/viper.go b/viper.go
index a32ab73..bad2df8 100644
--- a/viper.go
+++ b/viper.go
@@ -1310,7 +1310,7 @@ func (v *Viper) writeConfig(filename string, force bool) error {
 		flags = os.O_CREATE | os.O_TRUNC | os.O_WRONLY
 	} else {
 		if _, err := os.Stat(filename); os.IsNotExist(err) {
-			flags = os.O_WRONLY
+			flags = os.O_CREATE | os.O_WRONLY
 		} else {
 			return fmt.Errorf("File: %s exists. Use WriteConfig to overwrite.", filename)
 		}
diff --git a/viper_test.go b/viper_test.go
index c8fa1f4..74db59b 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -987,6 +987,26 @@ p_ppu = 0.55
 p_batters.batter.type = Regular
 `)
 
+func TestSafeWriteConfigProperties(t *testing.T) {
+	v := New()
+	fs := afero.NewMemMapFs()
+	v.SetFs(fs)
+	v.SetConfigName("c")
+	v.SetConfigType("properties")
+	err := v.ReadConfig(bytes.NewBuffer(propertiesExample))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := v.SafeWriteConfigAs("c.properties"); err != nil {
+		t.Fatal(err)
+	}
+	read, err := afero.ReadFile(fs, "c.properties")
+	if err != nil {
+		t.Fatal(err)
+	}
+	assert.Equal(t, propertiesWriteExpected, read)
+}
+
 func TestWriteConfigProperties(t *testing.T) {
 	v := New()
 	fs := afero.NewMemMapFs()