From: rico gloeckner <redmine@...>
Date: 2010-04-20T17:30:42+09:00
Subject: [ruby-core:29649] [Bug #3178] Fileutils#rmdir does rescue Dir Errors without raising new

Bug #3178: Fileutils#rmdir does rescue Dir Errors without raising new
http://redmine.ruby-lang.org/issues/show/3178

Author: rico gloeckner
Status: Open, Priority: Normal
Category: lib
ruby -v: 1.9.1-p376 (manual)

another one from #ruby@freenode

15:29 < jetienne> apeiros: on 1.8.7, FileUtils.rmdir('/tmp/nonempty_dir') trigger a Errno::ENOTEMPTY exception, but it doesnt on 1.9.1

/tmp/nonempty_dir is a directory which contains further directories. prior to 1.9.1, this will raise ENOTEMPTY, with 1.9.1 this will return an array, containing the directory.

background:
Fileutils contains a block, which will rescue ENOTEMPTY from Dir#rmdir, without further raising the error.  This not only breaks backward compatibility, but is also unexpected.  From what i see, i spose this is related to the :parent feature (i.e. recursive removal, afaiu).

The proper behaviour seems to be to return an array containing the real deleted entries if :parent is true and to just re-raise the error if it isnt.  ill try to illustrate with ++ and -- how i'd modify rmdir() in a 1.9.1-p376

  def rmdir(list, options = {})
    fu_check_options options, OPT_TABLE['rmdir']
    list = fu_list(list)
    parents = options[:parents]
    fu_output_message "rmdir #{parents ? '-p ' : ''}#{list.join ' '}" if options[:verbose]
    return if options[:noop]
++  done = Array.new if parents
    list.each do |dir|
      begin
        Dir.rmdir(dir = dir.sub(%r</\z>, ''))
        if parents
          until (parent = File.dirname(dir)) == '.' or parent == dir
            Dir.rmdir(dir) 
 ++         done.push(dir) # inside "if parents {}", so we dont need to check here
          end
        end
      rescue Errno::ENOTEMPTY, Errno::ENOENT
 ++    raise $! if parents  # re-raise the error if parents is not set.
 ++    return done          # return successfully removed directories otherwise
      end
    end
  end
  module_function :rmdir

  OPT_TABLE['rmdir'] = [:parents, :noop, :verbose]


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