https://git.ruby-lang.org/ruby.git/commit/?id=df348310dc

From df348310dc2ba0b01f7dd7277184c688a5d430fe Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Sat, 24 Aug 2019 23:17:12 +0900
Subject: Add workaround for some CIs

https://rubyci.org/logs/rubyci.s3.amazonaws.com/debian8/ruby-master/log/20190824T093005Z.fail.html.gz
```
branches:
* trunk
  remotes/origin/trunk
```
and
```
fatal: Remote branch master not found in upstream origin
```

diff --git a/tool/lib/vcs.rb b/tool/lib/vcs.rb
index 55c7a96..63ed62b 100644
--- a/tool/lib/vcs.rb
+++ b/tool/lib/vcs.rb
@@ -540,9 +540,17 @@ 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
+    rescue => e
+      if "master" == url.to_str && e.message == "Command failed with exit 128: git"
+        warn "retry trunk instead of master", uplevel: 0
+        STDERR.puts "existing branches:"
+        system(COMMAND, "branch", "-a", 1 => 2)
+        url = Branch.new("trunk")
+        retry
+      end
+      raise
     end
 
     def after_export(dir)
-- 
cgit v0.10.2


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