From ef585ed810a6913e7174c19ed383ddba9c3949ed Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Wed, 14 Feb 2018 13:32:16 -0700
Subject: [PATCH] tls: Ensure parent dir exists before creating lock file

---
 caddytls/filestoragesync.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/caddytls/filestoragesync.go b/caddytls/filestoragesync.go
index 4c81ca02e..a8e7b9291 100644
--- a/caddytls/filestoragesync.go
+++ b/caddytls/filestoragesync.go
@@ -61,6 +61,10 @@ func (s *fileStorageLock) TryLock(name string) (Waiter, error) {
 		filename: s.storage.siteCertFile(name) + ".lock",
 		wg:       new(sync.WaitGroup),
 	}
+	// parent dir must exist
+	if err := os.MkdirAll(s.storage.site(name), 0700); err != nil {
+		return nil, err
+	}
 	lf, err := os.OpenFile(fw.filename, os.O_CREATE|os.O_EXCL, 0644)
 	if err != nil {
 		if os.IsExist(err) {