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MRI silently handles .so files as Ruby sources
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Simone Carletti  
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 More options Mar 9 2011, 3:59 pm
From: Simone Carletti <wep...@weppos.net>
Date: Thu, 10 Mar 2011 05:59:30 +0900
Local: Wed, Mar 9 2011 3:59 pm
Subject: [ruby-core:35471] MRI silently handles .so files as Ruby sources
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Hello,

today I noticed that if you have a file called filename.so.rb and you try to
require it without specifying the extension, MRI silently understands that
it isn't a .so file, will load the content and treat it as Ruby source.

# filename.so.rb

> puts __FILE__

> # somefile.rb
> require 'filename.so'

> # => /../../filename.so.rb

Other interpreters handle the case in a different way.
For example, JRuby won't load the file because it looks for a Ruby extension
in a file called filename.so.
See http://jira.codehaus.org/browse/JRUBY-5569

I had a small chat with Charles Oliver Nutter (you can read the comments in
the JIRA ticket) and I'm curious to know if the way MRI works should be
considered a bug, a coincidence or a feature.

Thanks,

--
Simone Carletti
Application Developer

Site & Blog: http://www.simonecarletti.com
Email: wep...@weppos.net
LinkedIn: http://linkedin.com/in/weppos
Skype: weppos


 
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Charles Oliver Nutter  
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 More options Mar 9 2011, 4:35 pm
From: Charles Oliver Nutter <head...@headius.com>
Date: Thu, 10 Mar 2011 06:35:55 +0900
Local: Wed, Mar 9 2011 4:35 pm
Subject: [ruby-core:35473] Re: MRI silently handles .so files as Ruby sources
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Just when I thought I knew all load-searching oddities :)

If you look at the JRuby bug you'll see that it's a very specific case
and I show several scenarios that either work or don't work...

* Only fails over for "extension" extensions like .so or
.bundle...does not fail over for things like foo.rb.rb or foo.rb.so
* Appears to do a search for both .rb and <extension extension> if the
original filename doesn't work
* Does not fail over to "extension" extensions that are not
appropriate for current platform, like .so.so on OS X

I think it's confusing and unpredictable and would just as soon have
the logic be "if it ends with an extension extension, only search
extension extensions."

- Charlie


 
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