no more `bundle exec ...`
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Build Status Dependency Status

rubygems-bundler && Noexec

Let's stop using bundle exec, kthx.

Introduction of the 1.0.0 release:


gem install rubygems-bundler

Next run (once):

gem regenerate_binstubs

And you're done!



It's no more required to modify ~/.gemrc anymore, just remove the old entry to be sure it works as expected. In case you need to use your own custom_shebang you can define it in ~/.gemrc to override the default:

custom_shebang: $env <your_custom_shebang_program>


Though you can let noexec do it's own thing and rely on looking up your binary via your Gemfile, you can also specify which binaries you want included or excluded. Create a .noexec.yaml file along side any Gemfiles you want to use. Then, to enable (or disable) the usage of your particular binary into your bundle, add an include or exclude section. For example:

exclude: [rake]


include: [haml]


In case you need explicitly skip loading Bundler.setup, prefix your command with NOEXEC_DISABLE=1:


The old method is still available and might kick in if your tools use NOEXEC environment variable:

NOEXEC=0 rails new app
NOEXEC=skip gist

both 0 and skip will disable the gem, this method is deprecated and will be removed with 1.2.0.


Things not going the way you'd like? Try your command again with NOEXEC_DEBUG=1 set and create a ticket. I'll fix it right away!

IRC support:

#rubygems-bundler on

If you do not get relatively fast an answer make sure to leave an email to secure an later answer.

How does this work (ruby_noexec_wrapper)

It modifies gem wrappers shebang to load ruby_noexec_wrapper. Then, when you run gem binaries, it takes a look at your working directory, and every directory above it until it can find a Gemfile. If the executable you're running is present in your Gemfile, it switches to using that Gemfile instead (via Bundle.setup).

Rubygems and Bundler integration, makes executable wrappers generated by rubygems aware of bundler.

rubygems-bundler was merged with noexec gem in version 0.9.0.


gem uninstall rubygems-bundler

this will set all gems to /usr/bin/env ruby which is one of the safest choices (especially when using rvm).

In case of rvm additional steps will ensure this gem is removed and not installed again:

rvm get stable --without-gems=rubygems-bundler
rvm all-gemsets do gem uninstall --all --executables rubygems-bundler



  • Carl Lerche : help with the noexec code
  • Evan Phoenix : support on rubygems internalls
  • Yehuda Katz : the initial patch code, helping on making it even more usable
  • Loren Segal : shebang customization idea and explanations
  • Wayne E. Seguin : support in writing good code
  • André Arko : clarifications how rubygems/bundler works