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I was assisting aridlous on irc while he was experiencing an issue launching the rails console in a Rails 3.0 beta app.

He was getting the following error:

$ script/console
/opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- set (LoadError)
	from /opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
	from /opt/local/lib/ruby/gems/1.8/gems/bundler-0.9.7/lib/bundler/resolver.rb:1
	from /opt/local/lib/ruby/gems/1.8/gems/bundler-0.9.7/lib/bundler/runtime.rb:95:in `specs'
	from /opt/local/lib/ruby/gems/1.8/gems/bundler-0.9.7/lib/bundler/runtime.rb:81:in `specs_for'
	from /opt/local/lib/ruby/gems/1.8/gems/bundler-0.9.7/lib/bundler/runtime.rb:18:in `setup'
	from /opt/local/lib/ruby/gems/1.8/gems/bundler-0.9.7/lib/bundler.rb:66:in `setup'
	from /Users/User/dev/sekret/config/../config/preinitializer.rb:34
	from /Users/User/dev/sekret/config/boot.rb:28:in `load'
	from /Users/User/dev/sekret/config/boot.rb:28:in `preinitialize'
	from /Users/User/dev/sekret/config/boot.rb:10:in `boot!'
	from /Users/User/dev/sekret/config/boot.rb:129
	from script/console:2:in `require'
	from script/console:2

This appears to only affect folks using RVM and Bundler.

After a little sleuthing it appeared that RVM was setting a blank GEM_HOME environment variable when you leave the ruby version set to default.

$  env | grep GEM_HOME
GEM_HOME=

There are two easy fixes

1) unset GEM_HOME or 2) rvm system

Both of these clear the GEM_HOME environment variable.

aridlous dug around the bundler src after I helped him out and came back with the following tib-bit. I’d write a patch and probably will but I’m just too tired at the moment.

interesting, but the bug seems to be possibly 2 things: empty GEM_HOME should not be used, and when the join occurs I think it is creating an invalid GEM_PATH=”:/Users/User/.gem/ruby/1.8:/opt/local/lib/ruby/gems/1.8:” … it should not have that leading ‘:’

UPDATE: Filed an issue in Bundlers issue tracker

UPDATE 2: Fixed in 55509f