https://git.ruby-lang.org/ruby.git/commit/?id=f12f9f511d

From f12f9f511ddf2116ed5da9a580336b148812ad23 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 25 Apr 2020 13:16:40 +0900
Subject: fetch-bundled_gems.rb: Quiet detached HEAD advice


diff --git a/tool/fetch-bundled_gems.rb b/tool/fetch-bundled_gems.rb
index 28ae3d4..bb6f33a 100755
--- a/tool/fetch-bundled_gems.rb
+++ b/tool/fetch-bundled_gems.rb
@@ -17,8 +17,9 @@ else https://github.com/ruby/ruby/blob/trunk/tool/fetch-bundled_gems.rb#L17
   puts "retrieving #{n} ..."
   system(*%W"git clone #{u} #{n}") or abort
 end
-unless system(*%W"git checkout #{v.sub(/\A(?=\d)/, 'v')}", chdir: n)
-  unless /\A\d/ =~ v and system(*%W"git checkout #{v}", chdir: n)
+checkout = %w"git checkout -c advice.detachedHead=false"
+unless system(*checkout, v.sub(/\A(?=\d)/, 'v'), chdir: n)
+  unless /\A\d/ =~ v and system(*checkout, v, chdir: n)
     abort
   end
 end
-- 
cgit v0.10.2


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