From: Eric Hodel <drbrain@...7.net>
Date: 2007-02-07T10:08:38+09:00
Subject: Re: Rubygem install "Invalid argument - sources-0.0.1.gem"

On Feb 6, 2007, at 13:49, Jeremy Lecour wrote:
>> cat -n /usr/local/lib/site_ruby/1.8/rubygems/package.rb | grep '26 
>> [0-9]'
>
>    260          final_pos = @io.pos
>    261          @io.pos = init_pos
>    262          header = TarHeader.new(:name => name, :mode => mode,
>    263                                 :size => size, :prefix =>
> prefix).to_s
>    264          @io.write header
>    265          @io.pos = final_pos
>    266       end
>    267
>    268      def mkdir(name, mode)
>    269          raise ClosedIO if @closed

Hrm, it seems that something bogus is going on with your installation.

First, site_ruby should be under /usr/local/lib/ruby, not /usr/local/ 
lib.

Second, line 264 should be "@io.pos = final_pos", not what you've got.

Can you try removing /usr/local/lib/site_ruby/1.8/rubygems.rb and / 
usr/local/lib/site_ruby/1.8/rubygems/* and reinstalling?  I suspect  
those files are from an older version of RubyGems and are getting in  
the way.