Exception when trying to run external commands with shebang'ed ruby under bundle exec

aa_steps_to_reproduce.md

Steps to reproduce

• Place Gemfile, shebang_ruby, and bundle_exec_me.rb in the same directory
• bundle install
• chmod +x shebang_ruby
• bundle exec ruby bundle_exec_me.rb

bundle_exec_me.rb

puts "-- trying plain ruby shebang --"
puts `#{File.dirname(File.expand_path(__FILE__))}/shebang_ruby`

puts "-- trying with_clean_env ruby shebang --"
Bundler.with_clean_env { puts `#{File.dirname(File.expand_path(__FILE__))}/shebang_ruby` }

Gemfile

source "http://rubygems.org"

# just need at least one dependency to generate the bug; this could be any gem
gem "rake"

shebang_ruby

#!/usr/bin/ruby

puts "HEY THERE"

zz_output.txt

-- trying plain ruby shebang --
/Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/spec_set.rb:90:in `materialize': Could not find rake-0.9.2 in any of the sources (Bundler::GemNotFound)
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/spec_set.rb:83:in `map!'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/spec_set.rb:83:in `materialize'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/definition.rb:90:in `specs'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/definition.rb:135:in `specs_for'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/definition.rb:124:in `requested_specs'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/environment.rb:23:in `requested_specs'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/runtime.rb:11:in `setup'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler.rb:110:in `setup'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/setup.rb:17

-- trying clean env ruby shebang --
/Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/spec_set.rb:90:in `materialize': Could not find rake-0.9.2 in any of the sources (Bundler::GemNotFound)
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/spec_set.rb:83:in `map!'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/spec_set.rb:83:in `materialize'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/definition.rb:90:in `specs'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/definition.rb:135:in `specs_for'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/definition.rb:124:in `requested_specs'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/environment.rb:23:in `requested_specs'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/runtime.rb:11:in `setup'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler.rb:110:in `setup'
	from /Users/phinze/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/bundler-1.1.pre.8/lib/bundler/setup.rb:17