rbenv-bundler: A Bundler Plugin for rbenv

This plugin transparently makes rbenv's shims aware of bundle installation paths. It saves you from the hassle of having to type bundle exec ${command} when working with per-project gemsets and will enable rbenv which ${command} to report Bundler-installed gem executables if available.

A Word of Warning

Using this plugin has consequences. It runs an internal Ruby script to maintain the link between rbenv shims and Bundler-controlled executables, and this will slow down rbenv rehash and your shell initialization. For the reason above and its statefulness across invocations, this plugin is not sanctioned by the rbenv maintainers. As an alternative, consider the [binstubs method] (https://github.com/sstephenson/rbenv/wiki/Understanding-binstubs).

Why the solemn warning label, and why criticize one's own project? Well, because using rbenv with Bundler seamlessly isn't yet a solved problem. Inspecting Bundler-controlled projects for gem executables, the mechanism employed by this plugin, is costly and complicated. On the other hand, using Bundler binstubs and prepending ./bin to PATH is pretty much a hack. Rock, meet hard place.

Installation

Get rbenv working. Read the documentation thoroughly and be sure to set up your Bash environment correctly.

Install the plugin.

 $ git clone -- git://github.com/carsomyr/rbenv-bundler.git \
   ~/.rbenv/plugins/bundler

Make sure that there is a 1.8.7+ system or rbenv Ruby with the Bundler gem installed, available for the plugin's use.
```
 $ ruby -r bundler -e "puts RUBY_VERSION"
   1.9.3
```

Usage

Just as you would run rbenv rehash upon installation of a new Ruby distribution or a gem with associated executable, you will also need to run it inside Bundler-controlled project directories with local, rbenv-installed Ruby versions set.

 $ # Suppose the project uses Ruby version 1.9.3-p374.
 $ rbenv local 1.9.3-p374

 $ # Install the version-specific Bundler gem.
 $ gem install bundler

 $ # Suppose you already have a Gemfile.
 $ bundle install --path vendor/bundle

 $ # Don't forget to rehash!
 $ rbenv rehash

 $ # If "rake" is a Bundler-installed gem executable, report its location
 $ # with "rbenv which". The result should look like
 $ # "${PWD}/vendor/local/ruby/1.9.1/bin/rake"
 $ rbenv which rake

 $ # Run "rake" without having to type "bundle exec rake".
 $ rake

If you wish to disable the plugin, type rbenv bundler off. Type rbenv bundler on to enable.

Version History

0.95 (January 10, 2013)

Fix rbenv version detection to look for .ruby-version files in addition to .rbenv-version files.
Set up the PATH environment variable correctly when building rbenv Ruby profiles.
Make rbenv Ruby profile discovery more robust.

0.94 (July 21, 2012)

Relicense the project to the Apache License, Version 2.0.
Change the rehash.rb script so that it detects the BUNDLE_GEMFILE environment variable and looks for a Bundler-controlled project there.
Fix issue #21, where the RbenvBundler#ensure_capable_ruby method would claim JRuby 1.9.x as capable when it's not (lack of Kernel#fork).
Fix issue #22. This addresses the corner cases when either the manifest.txt file doesn't exist or the ruby_profiles.yml file is first created.

0.93 (May 4, 2012)

Fix issue #19, where a crash would result from rbenv Ruby profiles not being updated to reflect the removal of a Ruby. The rehash.rb script now checks the recency of the ~/.rbenv/versions directory instead of rbenv Ruby directories to determine if Rubies have been added or removed.
Fix issue #17, where the rehash.rb script would attempt to parse empty child process output when building rbenv Ruby profiles. Such situations are now detected and skipped.
Mask the return value of the rehash.rb script. Change the rehash hook so that it doesn't cause the shell to exit prematurely from -e being in effect.

0.92 (April 14, 2012)

Ensure that a capable Ruby runs the rehash.rb script. Change the rehash.rb script so that if it detects an inappropriate Ruby version, it will attempt to locate and Kernel#exec an appropriate one.
Build rbenv Ruby profiles to induce correct Bundler search behavior. With knowledge of each Ruby(Gems) implementation's version information and directory structure, the rehash.rb script can configure Bundler to exhibit the correct search behavior in all cases.
Fix issue #14, where Git-based dependencies would not resolve correctly with the rehash.rb script. When using a Git repository as a dependency, Bundler loads its .gemspec file, which in turn may modify the Ruby state arbitrarily in ways that aren't readily reversible. To sidestep such behavior, the plugin now forks a child process for making sensitive Bundler calls.
Fix issue #12, where setups without --path specified would sometimes pick gem executables with incorrect versions. As a result of reconciling different use cases, the plugin has been rearchitected to use a helper script, rehash.rb, to explore Bundler-controlled directories and create a gemspec manifest for each project. That way, a gem executable satisfying Gemfile version constraints can be picked every time.

0.91 (January 18, 2012)

The plugin now scans ~/.bundle/config in addition to, and as a fallback for, the project-local Bundler configuration file. Credit @mbrictson.
Fix issue #6, where nonexistent directories would cause the rehash mechanism to return prematurely. Credit @mbrictson.

0.90 (September 28, 2011)

Update plugin scripts to use the RBENV_DIR environment variable.
Start release tagging.

License

Copyright 2012 Roy Liu

Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy
of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations
under the License.