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Note for RubyGems >= 2.2.0

Generally, this gem is not needed on RubyGems >= 2.2.0. Simply set the RUBYGEMS_GEMDEPS environment variable to either the path of your Gemfile or - to auto-discover in parent directories.

However, not all Gemfile syntax is supported yet. If you find bugs using RUBYGEMS_GEMDEPS, please report them.

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!



You no longer need to modify ~/.gemrc, just remove the old entry to be sure it works as expected. If 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]

Disabling executables

In case you know certain binaries should not use bundler you can define a list of this binaries:

export NOEXEC_EXCLUDE="gist bluepill"

Put it into ~/.bashrc or other shell initialization file to make it persistent.

Disabling any commands

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

NOEXEC_DISABLE=1 rails new app

To disable for whole shell session:


And to restore automatic behavior:


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 an answer relatively quickly, be sure to leave your email address so someone can get back to you later.

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

Uninstallation of executable-hooks

rubygems-bundler does not change the shebangs itself anymore, this was extracted to executable-hooks:

gem uninstall executable-hooks

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

Removing from RVM

When using rvm, these additional steps will ensure this gem is removed and not installed again:

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



  • Carl Lerche : help with the noexec code
  • Evan Phoenix : support on rubygems internals
  • 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