https://git.ruby-lang.org/ruby.git/commit/?id=97ad7862d5

From 97ad7862d5f65c48409a5301609af8448aaae16d Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Sat, 24 Aug 2019 16:22:37 +0900
Subject: Add debug print

matser branch not found on some CIs
https://rubyci.org/logs/rubyci.s3.amazonaws.com/debian9/ruby-master/log/20190824T063005Z.fail.html.gz
```
fatal: Remote branch master not found in upstream origin
```

diff --git a/tool/lib/vcs.rb b/tool/lib/vcs.rb
index 9a90a04..55c7a96 100644
--- a/tool/lib/vcs.rb
+++ b/tool/lib/vcs.rb
@@ -540,6 +540,7 @@ class VCS https://github.com/ruby/ruby/blob/trunk/tool/lib/vcs.rb#L540
     end
 
     def export(revision, url, dir, keep_temp = false)
+      puts "branches:"; system(COMMAND, "branch", "-a") # for debug
       ret = system(COMMAND, "clone", "-s", (@srcdir || '.').to_s, "-b", url, dir)
       ret
     end
-- 
cgit v0.10.2


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