From 241b7483ea954653512d4895ad6bacf79ee26ddc Mon Sep 17 00:00:00 2001
From: Cameron Moore <moorereason@gmail.com>
Date: Sat, 16 Jan 2021 23:05:58 -0600
Subject: [PATCH] tpl: Fix race condition in text template baseof

Copy most of the htmltemplate cloning to the textemplate implementation
in the same function.
---
 tpl/tplimpl/template.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tpl/tplimpl/template.go b/tpl/tplimpl/template.go
index eb91ab837ac..60e3b7df93f 100644
--- a/tpl/tplimpl/template.go
+++ b/tpl/tplimpl/template.go
@@ -598,10 +598,16 @@ func (t *templateHandler) applyBaseTemplate(overlay, base templateInfo) (tpl.Tem
 			}
 		}
 
-		templ, err = templ.Parse(overlay.template)
+		templ, err = texttemplate.Must(templ.Clone()).Parse(overlay.template)
 		if err != nil {
 			return nil, overlay.errWithFileContext("parse failed", err)
 		}
+
+		// The extra lookup is a workaround, see
+		// * https://github.com/golang/go/issues/16101
+		// * https://github.com/gohugoio/hugo/issues/2549
+		// templ = templ.Lookup(templ.Name())
+
 		return templ, nil
 	}