FileUtils.mkdir_p is broken on Windows
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                 Key: JRUBY-2052
                 URL: http://jira.codehaus.org/browse/JRUBY-2052
             Project: JRuby
          Issue Type: Bug
          Components: Core Classes/Modules
    Affects Versions: JRuby 1.1RC1
         Environment: Windows Vista
            Reporter: Vladimir Sizikov
            Assignee: Vladimir Sizikov


{noformat}
require 'fileutils'
FileUtils.mkdir_p 'D:/blh/vvs/vvs/vvs/vv1/vvs'
{noformat}

Works fine in MRI, but raises an error on Windows:
SystemCallError: Unknown error - mkdir failed
        from D:/work/jruby-dev/jruby/lib/ruby/1.8/fileutils.rb:217:in `mkdir_p'
        from D:/work/jruby-dev/jruby/lib/ruby/1.8/fileutils.rb:215:in 
`reverse_each'
        from D:/work/jruby-dev/jruby/lib/ruby/1.8/fileutils.rb:215:in `mkdir_p'
        from D:/work/jruby-dev/jruby/lib/ruby/1.8/fileutils.rb:215:in `each'
        from D:/work/jruby-dev/jruby/lib/ruby/1.8/fileutils.rb:201:in `mkdir_p'
        from D:/work/jruby-dev/jruby/lib/ruby/1.8/fileutils.rb:215:in `puts'

It seems like File#dirname is incorrect on Windows. See related JRUBY-1422.

Compare output from 
p File.dirname("C:/"):

MRI: C:/

JRuby: C:

This is important to mkdir_p implementation.

Fix is coming.





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