fileutils.rb: fix error for non-existent entry

* lib/fileutils.rb (FileUtils::Entry_#copy): ensure that the
  source entry exists first, to fix error for non-existent entry.
  [ruby-core:77885] [Bug #12892]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56551 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 5 insertions, 0 deletions

diff --git a/test/fileutils/test_fileutils.rb b/test/fileutils/test_fileutils.rb
index 00441a4cfb..0ff0aadca2 100644
--- a/test/fileutils/test_fileutils.rb
+++ b/test/fileutils/test_fileutils.rb
@@ -361,6 +361,11 @@ class TestFileUtils < Test::Unit::TestCase
     assert_raise(ArgumentError, bug3588) do
       cp_r 'tmp2', 'tmp2/new_tmp2'
     end
+
+    bug12892 = '[ruby-core:77885] [Bug #12892]'
+    assert_raise(Errno::ENOENT, bug12892) do
+      cp_r 'non/existent', 'tmp'
+    end
   end
 
   def test_cp_r_symlink