https://git.ruby-lang.org/ruby.git/commit/?id=5a6954ba74

From 5a6954ba74adf190a64f91598667520135284a1c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 7 Sep 2019 17:28:05 +0900
Subject: Suppress detached head warning


diff --git a/tool/lib/vcs.rb b/tool/lib/vcs.rb
index 2a6a4b5..85a4827 100644
--- a/tool/lib/vcs.rb
+++ b/tool/lib/vcs.rb
@@ -583,7 +583,7 @@ class VCS https://github.com/ruby/ruby/blob/trunk/tool/lib/vcs.rb#L583
     end
 
     def export(revision, url, dir, keep_temp = false)
-      system(COMMAND, "clone", "-s", (@srcdir || '.').to_s, "-b", url, dir) or return
+      system(COMMAND, "clone", "-c", "advice.detachedHead=false", "-s", (@srcdir || '.').to_s, "-b", url, dir) or return
       system(COMMAND, "fetch", "origin", "+refs/notes/commits:refs/notes/commits", chdir: dir) or return
       (Integer === revision ? GITSVN : GIT).new(File.expand_path(dir))
     end
-- 
cgit v0.10.2


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