file.c: realpath on special symlink

* file.c (realpath_rec): fallback to symlink path when it is
  accessible but the link target is not actual entry on file
  systems.  [ruby-dev:50487] [Bug #14557]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62607 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/test/ruby/test_file.rb b/test/ruby/test_file.rb
index 9f09ac6fd1..89757287d1 100644
--- a/test/ruby/test_file.rb
+++ b/test/ruby/test_file.rb
@@ -303,6 +303,14 @@ class TestFile < Test::Unit::TestCase
     }
   end
 
+  def test_realpath_special_symlink
+    IO.pipe do |r, w|
+      if File.pipe?(path = "/dev/fd/#{r.fileno}")
+        assert_file.identical?(File.realpath(path), path)
+      end
+    end
+  end
+
   def test_realdirpath
     Dir.mktmpdir('rubytest-realdirpath') {|tmpdir|
       realdir = File.realpath(tmpdir)