https://git.ruby-lang.org/ruby.git/commit/?id=eb84b33c86

From eb84b33c86280a72aaeedae1e582045528c534b2 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 9 May 2019 14:02:01 +0900
Subject: Search a branch name at a detached head


diff --git a/tool/vcs.rb b/tool/vcs.rb
index 9310629..1d8fe90 100644
--- a/tool/vcs.rb
+++ b/tool/vcs.rb
@@ -392,15 +392,16 @@ class VCS https://github.com/ruby/ruby/blob/trunk/tool/vcs.rb#L392
     def self.get_revisions(path, srcdir = nil)
       gitcmd = [COMMAND]
       last = cmd_read_at(srcdir, [[*gitcmd, 'rev-parse', '--short=10', 'HEAD']]).rstrip
-      if path
-        log = cmd_read_at(srcdir, [[*gitcmd, 'log', '-n1', '--date=iso', path]])
-      else
-        log = cmd_read_at(srcdir, [[*gitcmd, 'log', '-n1', '--date=iso']])
-      end
+      log = cmd_read_at(srcdir, [[*gitcmd, 'log', '-n1', '--date=iso', *path]])
       changed = log[/\Acommit (\h+)/, 1]
       changed = changed[0, last.size]
       modified = log[/^Date:\s+(.*)/, 1]
       branch = cmd_read_at(srcdir, [gitcmd + %W[symbolic-ref --short HEAD]])
+      if branch.empty?
+        branch_list = cmd_read_at(srcdir, [gitcmd + %W[branch --list --contains HEAD]]).lines
+        branch_list.delete_if {|b| /detached at/ =~ b}
+        (branch = branch_list[0]).strip! unless branch_list.empty?
+      end
       branch.chomp!
       upstream = cmd_read_at(srcdir, [gitcmd + %W[branch --list --format=%(upstream:short) #{branch}]])
       upstream.chomp!
-- 
cgit v0.10.2


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