https://git.ruby-lang.org/ruby.git/commit/?id=6cad064424

From 6cad0644248d5acbaf3a2e8de4ff6d88b3dd2cb4 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 15 Sep 2019 16:23:33 +0900
Subject: Try to fetch commits notes to the source tree automatically

[Bug #16167]

diff --git a/tool/lib/vcs.rb b/tool/lib/vcs.rb
index f8b78bc..924dfe3 100644
--- a/tool/lib/vcs.rb
+++ b/tool/lib/vcs.rb
@@ -607,10 +607,9 @@ class VCS https://github.com/ruby/ruby/blob/trunk/tool/lib/vcs.rb#L607
         warn "no starting commit found", uplevel: 1
         from = nil
       end
-      _rev = cmd_read({'LANG' => 'C', 'LC_ALL' => 'C'},
-                     %W"#{COMMAND} show-ref notes/commits")
-      unless $?.success?
-        raise "need notes/commits tree; run `git fetch origin refs/notes/commits:refs/notes/commits` in the repository"
+      unless system(*%W"#{COMMAND} fetch origin refs/notes/commits:refs/notes/commits",
+                    chdir: @srcdir, exception: false)
+        abort "Could not fetch notes/commits tree"
       end
       to ||= 'HEAD'
       if from
-- 
cgit v0.10.2


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