JRuby-1.7.3: possible bug in Dir.exists?

andrewkendall · March 27, 2013, 4:31pm

we had some weird behavior in our test suite failing while using
simplecov. basically simplecov uses an at_exit that checks $! to see if
it should exit with a non-zero code. tracking down what was happening, i
found that it appears Dir.exists? returns false, as it should, but also
sets $! without throwing an exception. see this gist to see a simple
test.rb and the console output.

gist.github.com

https://gist.github.com/akreiling/5253467

console.log

~$ rvm default
~$ ruby --version
ruby 1.9.3p374 (2013-01-15 revision 38858) [x86_64-darwin12.2.0]
~$ ruby test.rb
bar
~$ rvm 1.7.3
~$ ruby --version
jruby 1.7.3 (1.9.3p385) 2013-02-21 dac429b on Java HotSpot(TM) 64-Bit Server VM 1.6.0_37-b06-434-11M3909 [darwin-x86_64]
~$ ruby test.rb
bar

This file has been truncated. show original

test.rb

if Dir.exists?("this/directory/probably/does/not/exist")
  puts "foo"
else
  puts "bar"
end

puts "#{$!.class} #{$!.message}\n\t" + $!.backtrace.join("\n\t") if $!

it appears to me that this is a bug in JRuby but i am not 100% sure. any
thoughts?

thanks!
-a

andrewkendall · March 27, 2013, 8:04pm

Yeah this sure looks like a bug to me too…Can you open up an issue
for this? If exists? was supposed to raise on ENOENT it would be
fairly limited in value.

-Tom

On Wed, Mar 27, 2013 at 10:28 AM, Andrew K. [email protected]
wrote:

thoughts?

thanks!
-a

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